CN110055905B - Reinforcing method for novel assembled masonry arch - Google Patents
Reinforcing method for novel assembled masonry arch Download PDFInfo
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- CN110055905B CN110055905B CN201910190428.XA CN201910190428A CN110055905B CN 110055905 B CN110055905 B CN 110055905B CN 201910190428 A CN201910190428 A CN 201910190428A CN 110055905 B CN110055905 B CN 110055905B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 22
- 239000004567 concrete Substances 0.000 claims abstract description 80
- 239000004744 fabric Substances 0.000 claims abstract description 24
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 14
- 238000009434 installation Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 17
- 238000005266 casting Methods 0.000 claims description 9
- 239000003292 glue Substances 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 5
- 239000011241 protective layer Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 9
- 230000002787 reinforcement Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
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)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a novel reinforcing method of an assembled masonry arch, which comprises the following steps: a. prefabricating concrete arch blocks; b. the concrete arch blocks are orderly arranged along the straight line to form an arch block straight line array; c. tiling FRP cloth on the upper surface of the arch block linear array to obtain a flexible donor; d. pouring a mortar protective layer; e. pouring a left permanent support and a right permanent support; f. fixedly placing a left temporary support and a right temporary support; g. installing left and right jacks; h. preparing for hoisting; i. lifting the flexible donor and forming an arch ring; j. disassembling the eye bolt; k. pushing the arch ring into place; l, resetting the left jack and the right jack; m, repeating the step h-step l to finish the subsequent arch ring installation operation until the required arch rings are all installed below the bridge deck of the old bridge; and n, removing the left temporary support and the right temporary support. The reinforcing method can effectively process the old bridge structure, and the construction process is convenient and quick and has good durability.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a novel reinforcing method of an assembled masonry arch.
Background
The arch bridge structure has a long history in use in China, and has good bearing performance and durability. The country has invested in the advanced highway greatly since the 90 s of the 20 th century, so that the bridge industry of China has been unprecedented; with the continuous development and progress of the economy and society, the automobile conservation quantity in China is also continuously increased, with the continuous increase of the number of vehicles and the increasing loading of vehicles, certain concrete beam bridges are likely to exceed the original satisfied vehicle-mounted specifications.
In addition, due to the corrosion of the steel bar caused by environmental factors, the performance degradation of the concrete can be caused, so that the performance degradation speed of the bridge structure is accelerated, the bearing capacity is reduced, the service life of the structure is prolonged, and the normal use is affected, and the concrete performance is as follows:
1. in a simply supported girder bridge, steel bars deform and corrode to unrecoverable damage;
2. under the load of a heavier vehicle, the concrete beam bridge structure can cause rust damage to the steel bars due to cracking of the concrete, so that the service performance of the structure is reduced;
3. collapse of the bridge is a brittle failure, once the failure consequence is severe.
In summary, the above-mentioned situations show that part of bridges are easy to have reduced durability, strength and other mechanical properties caused by steel bar corrosion after being used for a short period of time, so that maintenance difficulty is greatly increased, bridge detection and evaluation period is greatly shortened, huge manpower and material resources are consumed, and even the others lose traffic bearing capacity, so that safety accidents are caused, which is unfavorable for social development and progress in the long term. It is therefore necessary to reinforce the existing bridge by efficient means.
Disclosure of Invention
The invention aims to provide a novel reinforcing method of an assembled masonry arch body, which aims at overcoming the defects of the prior art, and can effectively process old bridge structures, is convenient and quick in construction process and good in durability, namely, can effectively reduce labor cost and time cost and can effectively prolong the service life of the old bridge structures.
In order to achieve the above object, the present invention is achieved by the following technical scheme.
The reinforcing method of the novel assembled masonry arch body comprises the following steps of:
a. prefabricating a concrete arch block, wherein the concrete arch block is formed by pouring concrete, the longitudinal section of the concrete arch block is isosceles trapezoid, and the width value of the upper end part of the concrete arch block is larger than that of the lower end part of the concrete arch block;
b. the prefabricated concrete arch blocks are arranged and tiled along a straight line according to the required length, and gaps are reserved between two adjacent concrete arch blocks so as to form an arch block straight line array; for the concrete arch block placed at the lifting position, a metal threaded sleeve is pre-buried in the concrete arch block, the upper end of the metal threaded sleeve is exposed out of the upper surface of the corresponding concrete arch block, and an upward opening internal threaded hole is respectively formed in each metal threaded sleeve;
c. tiling FRP cloth on the upper surface of the arch block linear array, wherein the upper surface of each concrete arch block in the arch block linear array is fixedly connected with the FRP cloth respectively so as to obtain a flexible donor;
d. pouring a layer of mortar on the upper surface of the flexible donor to form a mortar protection layer, wherein the mortar protection layer is positioned on the upper surface of the FRP cloth of the flexible donor;
e. the left permanent support is cast and formed on the right end side of the left bridge pier of the old bridge in a concrete casting mode, the right permanent support is cast and formed on the left end side of the right bridge pier of the old bridge in a concrete casting mode, the left permanent support and the left bridge pier of the old bridge are cast and formed into a whole, and the right permanent support and the right bridge pier of the old bridge are cast and formed into a whole; the left permanent support is provided with a left permanent supporting surface with a normal direction facing to the upper right, the right permanent support is provided with a right permanent supporting surface with a normal direction facing to the upper left, and the left permanent support and the right permanent support are oppositely arranged left and right;
f. a left temporary support is fixedly arranged at the front end side of the left permanent support, a right temporary support is fixedly arranged at the front end side of the right permanent support, the left temporary support and the right temporary support are oppositely arranged left and right, the rear end surface of the left temporary support is contacted with the front end surface of the left permanent support, a left shear key is arranged between the left temporary support and the left permanent support, the rear end surface of the right temporary support is contacted with the front end surface of the right permanent support, and a right shear key is arranged between the right temporary support and the right permanent support; the left temporary support is provided with a left temporary support surface aligned front to back with the left permanent support surface of the left permanent support, and the right temporary support is provided with a right temporary support surface aligned front to back with the right permanent support surface of the right permanent support;
g. a left jack which horizontally moves forwards and backwards is arranged on the left temporary support, and a right jack which horizontally moves forwards and backwards is arranged on the right temporary support;
h. each metal threaded sleeve of the flexible donor is screwed into the eye bolt respectively, a cross beam is arranged at the lifting driving end of the crane, and the cross beam is connected with each eye bolt of the flexible donor through a lifting rope respectively;
i. the crane is lifted and the flexible donor is lifted, in the process, each concrete arch in the flexible donor is gradually attached to the side surface of the adjacent concrete arch under the action of gravity, and after the flexible donor is lifted, the arch ring with an arch shape is automatically formed; after the flexible donor is completely lifted and an arch ring is formed, the left end of the arch ring is placed on the left temporary supporting surface of the left temporary support, the right end of the arch ring is placed on the right temporary supporting surface of the right temporary support, the left end of the arch ring is positioned at the rear end side of the left jack, and the right end of the arch ring is positioned at the rear end side of the right jack;
j. after the arch ring is put up between the left temporary support and the right temporary support, disassembling each eye bolt on the arch ring and stopping the lifting action;
k. synchronously operating a left jack and a right jack, wherein the left jack pushes the left end part of the arch ring backwards and enables the left end of the arch ring to be pushed onto a left permanent supporting surface of a left permanent support, the right jack pushes the right end part of the arch ring backwards and enables the right end of the arch ring to be pushed onto a right permanent supporting surface of a right permanent support, the arch ring is pushed backwards to a designated position below a bridge deck of an old bridge under the synchronous action of the left jack and the right jack, and the upper end of the arch ring is contacted with the lower surface of the bridge deck of the old bridge;
l, after the first arch ring is installed in place, operating the left jack and the right jack and resetting the left jack and the right jack to an original state;
m, repeating the step h-step l to finish the subsequent arch ring installation operation until the required arch rings are all installed below the bridge deck of the old bridge;
and n, after all arch rings are installed, removing the left shear key between the left temporary support and the left permanent support, removing the right shear key between the right temporary support and the right permanent support, and finally removing the left temporary support and the right temporary support, thereby finishing the reinforcing operation of the old bridge.
In the step c, the upper surfaces of the concrete arches in the arch straight line array are fixedly connected with the FRP cloth in an adhesive mode respectively.
In the step c, the glue used for adhering and fixedly connecting each concrete arch block and the FRP cloth is epoxy resin glue.
In the step c, each concrete arch in the arch linear array is fixedly connected with the FRP cloth in a threaded connection mode.
A left shear key is arranged between the upper surface of the left temporary support and the upper surface of the left permanent support, and a left shear key is also arranged between the right surface of the left temporary support and the right surface of the left permanent support;
a right shear key is arranged between the upper surface of the right temporary support and the upper surface of the right permanent support, and a right shear key is also arranged between the left surface of the right temporary support and the left surface of the right permanent support.
The left shear key comprises a U-shaped steel, the front end part of the U-shaped steel of the left shear key is fastened to the left temporary support through a bolt, and the rear end part of the U-shaped steel of the left shear key is fastened to the left permanent support through a bolt;
the right shear key also comprises a U-shaped steel, the front end part of the U-shaped steel of the right shear key is fastened on the right temporary support through bolts, and the rear end part of the U-shaped steel of the right shear key is fastened on the right permanent support through bolts.
The beneficial effects of the invention are as follows: the invention relates to a novel reinforcing method of an assembled masonry arch, which comprises the following steps: a. prefabricating a concrete arch block, wherein the concrete arch block is formed by pouring concrete, the longitudinal section of the concrete arch block is isosceles trapezoid, and the width value of the upper end part of the concrete arch block is larger than that of the lower end part of the concrete arch block; b. the prefabricated concrete arch blocks are arranged and tiled along a straight line according to the required length, and gaps are reserved between two adjacent concrete arch blocks so as to form an arch block straight line array; for the concrete arch block placed at the lifting position, a metal threaded sleeve is pre-buried in the concrete arch block, the upper end of the metal threaded sleeve is exposed out of the upper surface of the corresponding concrete arch block, and an upward opening internal threaded hole is respectively formed in each metal threaded sleeve; c. tiling FRP cloth on the upper surface of the arch block linear array, wherein the upper surface of each concrete arch block in the arch block linear array is fixedly connected with the FRP cloth respectively so as to obtain a flexible donor; d. pouring a layer of mortar on the upper surface of the flexible donor to form a mortar protection layer, wherein the mortar protection layer is positioned on the upper surface of the FRP cloth of the flexible donor; e. the left permanent support is cast and formed on the right end side of the left bridge pier of the old bridge in a concrete casting mode, the right permanent support is cast and formed on the left end side of the right bridge pier of the old bridge in a concrete casting mode, the left permanent support and the left bridge pier of the old bridge are cast and formed into a whole, and the right permanent support and the right bridge pier of the old bridge are cast and formed into a whole; the left permanent support is provided with a left permanent supporting surface with a normal direction facing to the upper right, the right permanent support is provided with a right permanent supporting surface with a normal direction facing to the upper left, and the left permanent support and the right permanent support are oppositely arranged left and right; f. a left temporary support is fixedly arranged at the front end side of the left permanent support, a right temporary support is fixedly arranged at the front end side of the right permanent support, the left temporary support and the right temporary support are oppositely arranged left and right, the rear end surface of the left temporary support is contacted with the front end surface of the left permanent support, a left shear key is arranged between the left temporary support and the left permanent support, the rear end surface of the right temporary support is contacted with the front end surface of the right permanent support, and a right shear key is arranged between the right temporary support and the right permanent support; the left temporary support is provided with a left temporary support surface aligned front to back with the left permanent support surface of the left permanent support, and the right temporary support is provided with a right temporary support surface aligned front to back with the right permanent support surface of the right permanent support; g. a left jack which horizontally moves forwards and backwards is arranged on the left temporary support, and a right jack which horizontally moves forwards and backwards is arranged on the right temporary support; h. each metal threaded sleeve of the flexible donor is screwed into the eye bolt respectively, a cross beam is arranged at the lifting driving end of the crane, and the cross beam is connected with each eye bolt of the flexible donor through a lifting rope respectively; i. the crane is lifted and the flexible donor is lifted, in the process, each concrete arch in the flexible donor is gradually attached to the side surface of the adjacent concrete arch under the action of gravity, and after the flexible donor is lifted, the arch ring with an arch shape is automatically formed; after the flexible donor is completely lifted and an arch ring is formed, the left end of the arch ring is placed on the left temporary supporting surface of the left temporary support, the right end of the arch ring is placed on the right temporary supporting surface of the right temporary support, the left end of the arch ring is positioned at the rear end side of the left jack, and the right end of the arch ring is positioned at the rear end side of the right jack; j. after the arch ring is put up between the left temporary support and the right temporary support, disassembling each eye bolt on the arch ring and stopping the lifting action; k. synchronously operating a left jack and a right jack, wherein the left jack pushes the left end part of the arch ring backwards and enables the left end of the arch ring to be pushed onto a left permanent supporting surface of a left permanent support, the right jack pushes the right end part of the arch ring backwards and enables the right end of the arch ring to be pushed onto a right permanent supporting surface of a right permanent support, the arch ring is pushed backwards to a designated position below a bridge deck of an old bridge under the synchronous action of the left jack and the right jack, and the upper end of the arch ring is contacted with the lower surface of the bridge deck of the old bridge; l, after the first arch ring is installed in place, operating the left jack and the right jack and resetting the left jack and the right jack to an original state; m, repeating the step h-step l to finish the subsequent arch ring installation operation until the required arch rings are all installed below the bridge deck of the old bridge; and n, after all arch rings are installed, removing the left shear key between the left temporary support and the left permanent support, removing the right shear key between the right temporary support and the right permanent support, and finally removing the left temporary support and the right temporary support, thereby finishing the reinforcing operation of the old bridge. Through the steps, the novel reinforcing method of the assembled masonry arch body can effectively process the old bridge structure, the construction process is convenient and quick, the durability is good, namely, the labor cost and the time cost can be effectively reduced, and the service life of the old bridge structure can be effectively prolonged.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention.
Fig. 1 is a schematic structural view of a flexible donor of the present invention.
Fig. 2 is a schematic construction diagram of the present invention.
Fig. 3 is a schematic view of another view of the present invention.
Fig. 4 is a schematic diagram of a reinforced old bridge.
Fig. 1 to 4 include:
1-Flexible donor 11-Arch block Linear array
111-concrete arch block 12-metal threaded sleeve
13-FRP cloth 14-mortar protective layer
21-left permanent support 211-left permanent support surface
22-right permanent support 221-right permanent support surface
31-left temporary abutment 311-left temporary bearing surface
32-Right temporary support 321-Right temporary support surface
41-left shear key 42-right shear key
43-U-shaped steel 51-left jack
52-right jack 61-eye bolt
62-beam 63-hoisting rope
7-arch ring 8-old bridge.
Detailed Description
The invention will be described with reference to specific embodiments.
As shown in fig. 1 to 4, a method for reinforcing a novel assembled masonry arch comprises the following steps:
a. precast concrete arch blocks 111, wherein the concrete arch blocks 111 are formed by casting concrete, the longitudinal section of each concrete arch block 111 is in an isosceles trapezoid shape, and the width value of the upper end part of each concrete arch block 111 is larger than that of the lower end part;
b. the prefabricated concrete arch blocks 111 are arranged and tiled along a straight line according to the required length, and gaps are reserved between two adjacent concrete arch blocks 111 to form an arch block straight line array 11; for the concrete arch block 111 placed at the hoisting position, the metal threaded sleeves 12 are pre-embedded in the concrete arch block, the upper ends of the metal threaded sleeves 12 are exposed out of the upper surfaces of the corresponding concrete arch blocks 111, and the interiors of the metal threaded sleeves 12 are respectively provided with an upward-opening internal threaded hole;
c. the FRP cloth 13 is paved on the upper surface of the arch block linear array 11, and the upper surfaces of the concrete arches 111 in the arch block linear array 11 are respectively fixedly connected with the FRP cloth 13 so as to obtain the flexible donor 1;
d. pouring a layer of mortar on the upper surface of the flexible donor 1 to form a mortar protection layer 14, wherein the mortar protection layer 14 is positioned on the upper surface of the FRP cloth 13 of the flexible donor 1;
e. the left permanent support 21 is cast and formed on the right end side of the left bridge pier of the old bridge 8 in a concrete casting mode, the right permanent support 22 is cast and formed on the left end side of the right bridge pier of the old bridge 8 in a concrete casting mode, the left permanent support 21 and the left bridge pier of the old bridge 8 are cast and formed into a whole, and the right permanent support 22 and the right bridge pier of the old bridge 8 are cast and formed into a whole; wherein, the left permanent support 21 is provided with a left permanent support surface 211 with the normal direction facing to the upper right, the right permanent support 22 is provided with a right permanent support surface 221 with the normal direction facing to the upper left, and the left permanent support 21 is arranged right and left opposite to the right permanent support 22;
f. a left temporary support 31 is fixedly arranged on the front end side of the left permanent support 21, a right temporary support 32 is fixedly arranged on the front end side of the right permanent support 22, the left temporary support 31 and the right temporary support 32 are oppositely arranged left and right, the rear end surface of the left temporary support 31 is contacted with the front end surface of the left permanent support 21, a left shear key 41 is arranged between the left temporary support 31 and the left permanent support 21, the rear end surface of the right temporary support 32 is contacted with the front end surface of the right permanent support 22, and a right shear key 42 is arranged between the right temporary support 32 and the right permanent support 22; the left temporary support 31 is provided with a left temporary support surface 311 aligned front-to-back with the left permanent support surface 211 of the left permanent support 21, and the right temporary support 32 is provided with a right temporary support surface 321 aligned front-to-back with the right permanent support surface 221 of the right permanent support 22;
g. a left jack 51 horizontally moving forward and backward is mounted on the left temporary support 31, and a right jack 52 horizontally moving forward and backward is mounted on the right temporary support 32;
h. the metal threaded sleeves 12 of the flexible donor 1 are respectively screwed into the eye bolts 61, a cross beam 62 is arranged at the lifting driving end of the crane, and the cross beam 62 is respectively connected with the eye bolts 61 of the flexible donor 1 through a lifting rope 63;
i. the crane is lifted and the flexible donor 1 is lifted, in the process, each concrete arch 111 in the flexible donor 1 is gradually attached to the side surface of the adjacent concrete arch 111 under the action of gravity, and after the crane is lifted, the flexible donor 1 automatically forms an arch ring 7 in an arch shape; after the flexible donor 1 is completely lifted and the arch ring 7 is formed, the left end of the arch ring 7 is placed on the left temporary supporting surface 311 of the left temporary support 31 and the right end of the arch ring 7 is placed on the right temporary supporting surface 321 of the right temporary support 32, the left end of the arch ring 7 is positioned on the rear end side of the left jack 51, and the right end of the arch ring 7 is positioned on the rear end side of the right jack 52;
j. after the arch ring 7 is put between the left temporary support 31 and the right temporary support 32, the eye bolts 61 on the arch ring 7 are disassembled and the lifting operation is stopped;
k. the left jack 51 and the right jack 52 are synchronously operated, the left jack 51 pushes the left end part of the arch ring 7 backwards, the left end of the arch ring 7 is pushed onto the left permanent supporting surface 211 of the left permanent support 21, the right jack 52 pushes the right end part of the arch ring 7 backwards, the right end of the arch ring 7 is pushed onto the right permanent supporting surface 221 of the right permanent support 22, the arch ring 7 is pushed backwards to a designated position below the bridge deck of the old bridge 8 under the synchronous action of the left jack 51 and the right jack 52, and the upper end of the arch ring 7 is contacted with the lower surface of the bridge deck of the old bridge 8;
l, after the first arch ring 7 is installed in place, operating the left jack 51 and the right jack 52 and resetting the left jack 51 and the right jack 52 to the original state;
m, repeating the step h-step l to finish the subsequent arch ring 7 installation operation until the required arch rings 7 are all installed below the bridge deck of the old bridge 8;
n, after all the arch rings 7 are installed, the left shear key 41 between the left temporary support 31 and the left permanent support 21 is removed, the right shear key 42 between the right temporary support 32 and the right permanent support 22 is removed, and finally the left temporary support 31 and the right temporary support 32 are removed, so that the reinforcing operation of the old bridge 8 is completed.
It should be explained that, in step c, the upper surfaces of the concrete arches 111 in the arch straight line array 11 are fixedly connected with the FRP cloth 13 by gluing respectively; preferably, in step c, the glue used for adhesively and fixedly connecting each concrete arch 111 and the FRP cloth 13 is epoxy resin glue. Of course, besides the glue bonding and fixing mode, the invention can also realize fixed connection by adopting a screw connection fastening mode, and the concrete steps are as follows: in step c, each concrete arch 111 in the arch linear array 11 is fixedly connected to the FRP cloth 13 by screwing.
It is noted that, for the left shear key 41 installed between the left temporary support 31 and the left permanent support 21, the function thereof is to: preventing the arch ring 7 from dislocating with the left temporary support 31 and the left permanent support 21 during the transfer using the left jack 51 and the right jack 52. Likewise, for the right shear key 42 installed between the right temporary support 32 and the right permanent support 22, it functions as: preventing the arch ring 7 from dislocating with the right temporary support 32 and the right permanent support 22 during the transfer using the left jack 51 and the right jack 52. Also, a left shear key 41 is installed between the upper surface of the left temporary support 31 and the upper surface of the left permanent support 21, and a left shear key 41 is also installed between the right surface of the left temporary support 31 and the right surface of the left permanent support 21; similarly, a right shear key 42 is provided between the upper surface of the right temporary support 32 and the upper surface of the right permanent support 22, and a right shear key 42 is also provided between the left surface of the right temporary support 32 and the left surface of the right permanent support 22. For the left side shear key 41 and the right side shear key 42 of the present invention, the following structural designs may be adopted, specifically: the left shear key 41 comprises a U-shaped steel 43, the front end part of the U-shaped steel 43 of the left shear key 41 is fastened to the left temporary support 31 through bolts, and the rear end part of the U-shaped steel 43 of the left shear key 41 is fastened to the left permanent support 21 through bolts; the right shear key 42 also includes a U-shaped steel 43, the front end of the U-shaped steel 43 of the right shear key 42 is fastened to the right temporary support 32 by bolts, and the rear end of the U-shaped steel 43 of the right shear key 42 is fastened to the right permanent support 22 by bolts.
Through the design of the steps, the novel reinforcing method of the assembled masonry arch has the following effects, in particular:
1. the reinforcing method of the novel assembled masonry arch body is based on the FRP and the flexible arch body, namely has good durability and corrosion resistance, and can effectively prolong the service life of the old bridge 8;
2. the novel reinforcing method of the assembled masonry arch body is convenient to construct, short in construction period and capable of effectively reducing labor cost and time cost;
3. the novel prefabricated masonry arch reinforcement method is convenient to prefabricate, and specific concrete arch blocks 111 can be prefabricated according to the span and the height required by the present place, so that the required reinforcement arch ring 7 size is assembled;
4. the FRP cloth 13 adopted by the novel method for reinforcing the assembled masonry arch body has the characteristics of high strength and light weight, and can greatly improve the stability of the arch ring 7, thereby effectively reinforcing the old girder bridge structure;
5. in the reinforcement process, the left temporary support 31 and the right temporary support 32 are used as sliding guide rails of the arch ring 7, and the arch ring 7 is removed and recycled after being positioned completely, so that the reinforcement economic cost is reduced, and the reinforcement efficiency is improved;
6. the whole reinforcing process does not use steel bars, and the service performance of the reinforcing structure is not affected due to corrosion of the steel bars.
The foregoing is merely exemplary of the present invention, and those skilled in the art should not be considered as limiting the invention, since modifications may be made in the specific embodiments and application scope of the invention in light of the teachings of the present invention.
Claims (1)
1. The novel reinforcing method of the assembled masonry arch body is characterized by comprising the following steps of:
a. the concrete arch block (111), the concrete arch block (111) is formed by concrete pouring, the longitudinal section of the concrete arch block (111) is isosceles trapezoid, and the width value of the upper end part of the concrete arch block (111) is larger than that of the lower end part;
b. the prefabricated concrete arch blocks (111) are arranged and tiled along a straight line according to the required length, and a gap is reserved between two adjacent concrete arch blocks (111) to form an arch block straight line array (11); for the concrete arch block (111) placed at the lifting position, a metal threaded sleeve (12) is pre-buried in the concrete arch block, the upper end of the metal threaded sleeve (12) is exposed out of the upper surface of the corresponding concrete arch block (111), and the inside of each metal threaded sleeve (12) is respectively provided with an upward-opening internal threaded hole;
c. an FRP cloth (13) is paved on the upper surface of the arch block linear array (11), and the upper surfaces of the concrete arch blocks (111) in the arch block linear array (11) are fixedly connected with the FRP cloth (13) respectively to obtain a flexible donor (1);
the upper surfaces of the concrete arches (111) in the arch straight line array (11) are fixedly connected with the FRP cloth (13) in an adhesive mode respectively; or, each concrete arch (111) in the arch straight line array (11) is fixedly connected with the FRP cloth (13) in a threaded connection mode respectively;
d. pouring a layer of mortar on the upper surface of the flexible donor (1) to form a mortar protection layer (14), wherein the mortar protection layer (14) is positioned on the upper surface of the FRP cloth (13) of the flexible donor (1);
e. the left permanent support (21) is cast and formed on the right end side of the left bridge pier of the old bridge (8) in a concrete casting mode, the right permanent support (22) is cast and formed on the left end side of the right bridge pier of the old bridge (8) in a concrete casting mode, the left permanent support (21) and the left bridge pier of the old bridge (8) are cast and formed into a whole, and the right permanent support (22) and the right bridge pier of the old bridge (8) are cast and formed into a whole; wherein the left permanent support (21) is provided with a left permanent support surface (211) with a normal direction facing to the upper right, the right permanent support (22) is provided with a right permanent support surface (221) with a normal direction facing to the upper left, and the left permanent support (21) and the right permanent support (22) are arranged right and left;
f. a left temporary support (31) is fixedly arranged at the front end side of the left permanent support (21), a right temporary support (32) is fixedly arranged at the front end side of the right permanent support (22), the left temporary support (31) is oppositely arranged left and right with the right temporary support (32), the rear end surface of the left temporary support (31) is contacted with the front end surface of the left permanent support (21), a left shear key (41) is arranged between the upper surface of the left temporary support (31) and the upper surface of the left permanent support (21), and a left shear key (41) is also arranged between the right surface of the left temporary support (31) and the right surface of the left permanent support (21); the rear end face of the right temporary support (32) is in contact with the front end face of the right permanent support (22), a right shear key (42) is arranged between the upper surface of the right temporary support (32) and the upper surface of the right permanent support (22), a right shear key (42) is also arranged between the left surface of the right temporary support (32) and the left surface of the right permanent support (22), the left temporary support (31) is provided with a left temporary support surface (311) which is aligned front and back with the left permanent support surface (211) of the left permanent support (21), and the right temporary support (32) is provided with a right temporary support surface (321) which is aligned front and back with the right permanent support surface (221) of the right permanent support (22); the left shear key (41) comprises a U-shaped steel (43), the front end part of the U-shaped steel (43) of the left shear key (41) is fastened to the left temporary support (31) through bolts, and the rear end part of the U-shaped steel (43) of the left shear key (41) is fastened to the left permanent support (21) through bolts; the right shear key (42) also comprises a U-shaped steel (43), the front end part of the U-shaped steel (43) of the right shear key (42) is fastened to the right temporary support (32) through bolts, and the rear end part of the U-shaped steel (43) of the right shear key (42) is fastened to the right permanent support (22) through bolts;
g. a left jack (51) horizontally moving forward and backward is mounted on the left temporary support (31), and a right jack (52) horizontally moving forward and backward is mounted on the right temporary support (32);
h. each metal threaded sleeve (12) of the flexible donor (1) is screwed into each eye bolt (61) respectively, a cross beam (62) is arranged at the lifting driving end of the crane, and the cross beams (62) are connected with each eye bolt (61) of the flexible donor (1) respectively through lifting ropes (63);
i. the crane is lifted, the flexible donor (1) is lifted, in the process, each concrete arch (111) in the flexible donor (1) is gradually attached to the side surface of the adjacent concrete arch (111) under the action of gravity, and after the flexible donor (1) is lifted, the arch ring (7) with an arch shape is automatically formed; after the flexible donor (1) is completely lifted and an arch ring (7) is formed, placing the left end of the arch ring (7) on a left temporary supporting surface (311) of a left temporary support (31) and placing the right end of the arch ring (7) on a right temporary supporting surface (321) of a right temporary support (32), wherein the left end of the arch ring (7) is positioned at the rear end side of a left jack (51), and the right end of the arch ring (7) is positioned at the rear end side of a right jack (52);
j. after the arch ring (7) is placed between the left temporary support (31) and the right temporary support (32), detaching each eye bolt (61) on the arch ring (7) and stopping the lifting action;
k. synchronously operating a left jack (51) and a right jack (52), wherein the left jack (51) pushes the left end part of the arch ring (7) backwards, so that the left end of the arch ring (7) is pushed onto a left permanent supporting surface (211) of a left permanent support (21), the right jack (52) pushes the right end part of the arch ring (7) backwards, so that the right end of the arch ring (7) is pushed onto a right permanent supporting surface (221) of a right permanent support (22), and the arch ring (7) is pushed backwards to a specified position below a bridge deck of a old bridge (8) under the synchronous action of the left jack (51) and the right jack (52), and the upper end of the arch ring (7) is contacted with the lower surface of the bridge deck of the old bridge (8);
l, after the first arch ring (7) is installed in place, operating the left jack (51) and the right jack (52) and resetting the left jack (51) and the right jack (52) to original states;
m, repeating the step h-step l to finish the installation operation of the subsequent arch ring (7) until the required arch ring (7) is installed below the bridge deck of the old bridge (8);
n, after all arch rings (7) are installed, removing a left shear key (41) between a left temporary support (31) and a left permanent support (21) and removing a right shear key (42) between a right temporary support (32) and a right permanent support (22), and finally removing the left temporary support (31) and the right temporary support (32), thereby finishing the reinforcing operation of the old bridge (8);
the glue used for the adhesive fixing connection of each concrete arch block (111) and the FRP cloth (13) is epoxy resin glue.
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| CN111218893B (en) * | 2020-01-20 | 2021-04-20 | 浙江大学城市学院 | Construction method for reinforcing existing line-crossing bridge by newly-added pier column bearing steel truss girder |
| CN112064523B (en) * | 2020-09-29 | 2021-04-20 | 保利长大工程有限公司 | Reinforcing method for additionally arranging beam slab structure on old stone arch bridge |
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| CN101793010A (en) * | 2010-03-16 | 2010-08-04 | 中交二航局第二工程有限公司 | Arch-included integral pushing method for large-tonnage multi-span combined arch bridge |
| CN101935987A (en) * | 2010-08-27 | 2011-01-05 | 中交一公局桥隧工程有限公司 | Construction method for integrally sliding large-span steel pipe arch of curved bridge |
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| CN108570920A (en) * | 2018-05-21 | 2018-09-25 | 东北林业大学 | A kind of construction and construction method of precast segment assembly concrete arch-type bridge |
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| CN101793010A (en) * | 2010-03-16 | 2010-08-04 | 中交二航局第二工程有限公司 | Arch-included integral pushing method for large-tonnage multi-span combined arch bridge |
| KR101092151B1 (en) * | 2010-05-28 | 2011-12-12 | 주식회사 스판코리아 | A green arch bridge use of arch panel |
| CN101935987A (en) * | 2010-08-27 | 2011-01-05 | 中交一公局桥隧工程有限公司 | Construction method for integrally sliding large-span steel pipe arch of curved bridge |
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