CN215629394U - Pre-pressing sand bag system of arch bridge main arch ring cast-in-place concrete supporting system - Google Patents
Pre-pressing sand bag system of arch bridge main arch ring cast-in-place concrete supporting system Download PDFInfo
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- CN215629394U CN215629394U CN202120715018.5U CN202120715018U CN215629394U CN 215629394 U CN215629394 U CN 215629394U CN 202120715018 U CN202120715018 U CN 202120715018U CN 215629394 U CN215629394 U CN 215629394U
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- 239000004576 sand Substances 0.000 title claims abstract description 111
- 238000003825 pressing Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000009415 formwork Methods 0.000 claims abstract description 5
- 230000002787 reinforcement Effects 0.000 claims description 6
- 238000005056 compaction Methods 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 16
- 239000002699 waste material Substances 0.000 abstract description 5
- 239000004743 Polypropylene Substances 0.000 description 9
- -1 polypropylene Polymers 0.000 description 9
- 229920001155 polypropylene Polymers 0.000 description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Abstract
The utility model discloses a pre-pressing sand bag system of an arch bridge main arch ring cast-in-place concrete support system, wherein a plurality of sand bag fixing positions are uniformly arranged at the pre-pressing position on the top surface of a bottom formwork of a main arch ring, a single sand bag is arranged in each sand bag fixing position, and engineering production aggregate with constant weight is filled in each sand bag; the sand bag comprises a bag body, a support bottom is arranged at the bottom of the bag body in a reinforcing mode, reinforcing surrounding belts are arranged at the vertical periphery, the middle waist and the top opening of the bag body in a reinforcing mode, double hanging belts are symmetrically arranged at the top opening of the bag body, and an upper sand containing opening line is arranged on the lower portion of the top opening of the bag body along the circumferential direction of the bag body. The utility model can directly utilize the aggregate produced by engineering, each bag has constant weight, easy hoisting, convenient loading and unloading and clean site. The fixing device directly utilizes the designed main arch ring to erect the steel bar, the fixing is firm, and the stress is accurate. The sand bag and the fixed steel bar can be repeatedly utilized after being used, the waste of materials is avoided, in addition, the time and the labor are saved, and the construction is safe.
Description
Technical Field
The utility model relates to a prepressing sand bag system, in particular to a prepressing sand bag system of an arch bridge main arch ring cast-in-place concrete supporting system.
Background
The breadth of our country is vast, and various types of large and small arch bridges are the bridge type with national features. The support system of the main arch ring of the common cast-in-place concrete arch bridge needs to adopt a prepressing measure, and aims to eliminate the inelastic deformation of the support system, carry out practical inspection on the support strength, bearing capacity, stability and calculation pre-arch degree, and obtain accurate data on the deformation and the pre-arch degree of the support system and a template so as to optimize a construction scheme and guide field construction.
The pre-compaction material of the arch bridge supporting system more adopts materials such as a sealing water bag, a standard concrete precast block, a soil stone gunny bag, profile steel and the like, and is characterized in that: the water bag is easy to damage, has higher requirements on the material of the bag, is not easy to fix during construction, and can not be used for other purposes after being used; the standard concrete precast blocks and the section steel need special reinforcement production, the production period is long, and the standard concrete precast blocks and the section steel can not be used for the second time generally, so that the material waste is caused; the earth and stone bags are inconvenient to assemble and disassemble, the weight change range is large, and the compression effect and the on-site civilized construction image and the like are influenced.
Disclosure of Invention
The utility model aims to provide a prepressing sand bag system of an arch bridge main arch ring cast-in-place concrete supporting system. The utility model adopts the standard sand bags made by unified order, the materials such as polypropylene and the like are convenient, the price is low, the charging can directly utilize the aggregate produced by engineering, the weight of each bag is constant, the hoisting is easy, the loading and unloading are convenient, and the site is clean. The fixing device directly utilizes the designed main arch ring to erect the steel bar, the fixing is firm, and the stress is accurate. The sand bag and the fixed steel bar can be repeatedly utilized after being used, the waste of materials is avoided, in addition, the time and the labor are saved, and the construction is safe.
The technical scheme of the utility model is as follows: a pre-pressing sand bag system of an arch bridge main arch ring cast-in-place concrete support system is characterized in that a plurality of sand bag fixing positions are uniformly arranged at the pre-pressing position on the top surface of a bottom template of a main arch ring, a single sand bag is arranged in each sand bag fixing position, and engineering production aggregate with constant weight is filled in each sand bag; the sand bag comprises a bag body, a support bottom is arranged at the bottom of the bag body in a reinforcing mode, reinforcing enclosing belts are arranged on the vertical periphery, the middle waist and the top opening of the bag body in a reinforcing mode, double hanging belts are symmetrically arranged at the top opening of the bag body, the reinforcing enclosing belts and the support bottom are made of double-layer materials, and a sand filling upper opening line is arranged on the lower portion of the top opening of the bag body along the circumferential direction of the reinforcing enclosing belts.
In the pre-pressed sand bag system of the arch bridge main arch ring cast-in-place concrete supporting system, two ends of each double-hanging strip are fixedly connected with the reinforcing surrounding strips around the vertical direction of the bag body.
In the pre-pressing sand bag system of the arch bridge main arch ring cast-in-place concrete support system, the sand bag fixing position comprises a plurality of rows of vertical erection reinforcing steel bars which are fixedly arranged along the width direction of a main arch ring bottom formwork at even intervals, 1 horizontal erection reinforcing steel bar is fixedly connected to the top of each row of vertical erection reinforcing steel bars, and the upper ends of the adjacent 2 vertical erection reinforcing steel bars in the same row are connected through the vertical erection reinforcing steel bars.
In the pre-pressed sand bag system of the arch bridge main arch ring cast-in-place concrete support system, the distance between two adjacent rows of vertical erection steel bars is 5-10 cm larger than that of a sand bag, and the distance between 2 adjacent vertical erection steel bars in the same row is 5-10 cm larger than that of the sand bag.
In the prepressing sand bag system of the arch bridge main arch ring cast-in-place concrete supporting system, each sand bag is numbered in sequence.
The utility model has the beneficial effects that: compared with the prior art, the utility model has the following advantages:
1. the standard sand bags which are made in a unified manner are adopted, the sand bags are made of polypropylene, the polypropylene and other materials are convenient, the price is low, the charging materials can directly utilize the aggregate produced by the engineering, the weight of each bag is constant, the hoisting is easy, the loading and unloading are convenient, and the site is clean. The fixing device of the sand bag directly utilizes the erection steel bar on the main arch ring, so that the fixing is firm and the stress is accurate. The sand bag and the fixed steel bar can be repeatedly utilized after being used, the waste of materials is avoided, in addition, the time and the labor are saved, the construction is safe, and the sand bag and the fixed steel bar have obvious advantages.
2. The prepressing sand bag is made of polypropylene materials with qualified quality, a standard sand bag with a large opening with the length of 100cm, the width of 100cm and the height of 120cm is processed and manufactured, and the bottom dragging and the surrounding belt of a double-layer polypropylene material with the width of 5cm are reinforced along the bottom, the periphery, the top and the middle waist of the sand bag, so that the sand bag is firm and durable. Double-layer polypropylene double-hanging strips with the width of 5cm, the height of 30cm and the width of 100cm are processed at the upper opening of the sand bag, so that the sand bag is convenient to carry and hoist. According to the weight of the sand used in the engineering, the position of the sand bag at the upper opening of the sand bag is measured by accurate weighing, and the sand bag is marked uniformly by paint. In addition, the serial number of each sand bag is marked, so that the sand bags can be hoisted and fixed orderly.
3. The sand bag fixing system adopts erection steel bars, and comprises two horizontal erection steel bars, a plurality of vertical erection steel bars and a plurality of longitudinal erection steel bars, wherein the distance between the horizontal erection steel bars is determined according to the size of a standard sand bag, the sand bag fixing system is set to be 110cm, two sides of the sand bag fixing system are respectively reserved with 5cm, the sand bag is convenient to install, and the length of the horizontal erection steel bars is determined according to the design width of an arch ring. The vertical erection steel bar is determined according to the thickness layering condition of the designed main arch ring, is generally not less than 30cm and is convenient to fix; and the longitudinal erection steel bars are arranged to ensure that the fixation is firmer.
The utility model is especially suitable for cast-in-place concrete arch bridges with steep terrain, short place, high requirement on pressed weight and short construction period.
Drawings
FIG. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic top view of the structure of FIG. 1;
fig. 3 is a schematic structural diagram of the sand bag.
Reference numerals: 1-double hanging strips, 2-sand loading upper opening lines, 3-reinforcing surrounding belts, 4-bottom supporting, 5-sand bags, 6-horizontal erection steel bars, 7-vertical erection steel bars, 8-main arch ring bottom formworks and 9-longitudinal erection steel bars.
Detailed Description
The utility model is further illustrated by the following figures and examples, which are not to be construed as limiting the utility model.
The embodiment of the utility model comprises the following steps: a pre-pressing sand bag system of an arch bridge main arch ring cast-in-place concrete supporting system is disclosed, as shown in attached figures 1-3, a plurality of sand bag fixing positions are uniformly arranged at the pre-pressing position of the top surface of a bottom formwork of a main arch ring 8, a single sand bag 5 is arranged in each sand bag fixing position, a row of sand bags 5 can be firmly fixed through the sand bag fixing positions, and the specific number of the sand bag fixing positions is determined according to the row number of the pre-pressing sand bags. Each sand bag 5 is filled with engineering production aggregate with constant weight. The sand bag 5 comprises a bag body made of qualified polypropylene materials, is processed and manufactured into a standard large-opening sand bag with the length of 100cm, the width of 100cm and the height of 120cm, and is characterized in that a bottom dragging 4 and a reinforcing surrounding belt 3 made of double-layer polypropylene materials with the width of 5cm are reinforced along the vertical periphery, the top opening and the middle waist of the sand bag 5, so that the sand bag 5 is firm and durable. The double-layer sling 1 made of polypropylene material with the width of 5cm, the height of 30cm and the width of 100cm is processed at the upper opening of the sand bag 5, so that the sand bag is convenient to carry and hoist. According to the weight of the used sand, the position of the sand filling upper opening line 2 of the sand bag 5 is measured by accurate weighing, and is marked uniformly by paint. The later stage loads the in-process dress to dress sand 2 departments of mouthful line can, need not weigh repeatedly. The weight of each bag of sand is controlled to be 1.5t according to the density of the sand used in the engineering.
The weight is calculated according to the pressure of the supporting system, and one or more rows of sand bags are hoisted, placed and fixed at the specified arch ring prepressing position, so that the prepressing effect is realized.
Every 1 both ends of double-hanging strip all are in the same place with the vertical all around reinforcement shroud ring 3 fixed connection of the bag body for 1 is whole with 3 formation of reinforcement shroud rings of double-hanging strip 1, and durable is more difficult to damage.
The sand bag fixed position is arranged according to main arch ring design reinforcing bar, lays horizontal erection reinforcing bar 6, vertical erection reinforcing bar 7 and vertical erection reinforcing bar 9 after main arch ring die block 8 installation is accomplished. The distance between the horizontal erection steel bars 6 is determined according to the size of the standard sand bag 5, and the length of the horizontal erection steel bars is determined according to the design width of the arch ring. The vertical erection steel bar 7 is determined according to the thickness layering condition of the designed main arch ring, is generally not less than 30cm, and can be additionally provided with a scaffold tube to ensure that the fixation is firmer if needed. A plurality of square frames are enclosed by the horizontal erection steel bars 6, the vertical erection steel bars 7 and the longitudinal erection steel bars 9, and the sand bag 5 is hung in the square frames, so that the sand bag is convenient to fix.
The distance between two adjacent rows of vertical erection steel bars 7 is 5-10 cm larger than that of the sand bag 5, and the distance between 2 adjacent vertical erection steel bars 7 in the same row is 5-10 cm larger than that of the sand bag 5. The sand bag is set to be 110cm, and the two sides of the sand bag are respectively reserved with 5cm, so that the sand bag 5 is convenient to install.
Each sand bag 5 is numbered in sequence, so that the sand bags are convenient to hoist and fix in order.
In the use process, according to the designed prepressing sequence and weight, the sand bags 5 are orderly hoisted by adopting a cable or hoisting equipment and are placed and fixed at the pressed positions according to the numbers.
And monitoring the prepressing period according to design and specification requirements, and timely and accurately mastering the prepressing deformation condition and effect. In windy or rainy and snowy weather, in order to avoid the influence on the stress effect caused by the increase of the weight of the sand bag 5, the upper part of the sand bag 5 is covered with light materials such as rain-proof cloth.
The pre-pressing time is generally 7-14 days, after the pre-pressing is finished, the sand bags 5 are hung open according to the reverse sequence of the pre-pressing sequence, and the subsequent construction of the main arch ring is started. The sand bag 6 can be used in temporary construction projects such as flood prevention storage or field cofferdam reinforcement, waste is avoided, and the sand can be used in normal concrete mixing construction.
The specific implementation case is as follows:
and a permanent river-crossing arch bridge connecting the left bank and the right bank of the Jinshajiang river has the total length of 116.6 m. The bridge is located in a V-shaped canyon on site, the site is very short, the arch box girder is prefabricated and can be used without the site, and in order to solve the problem, through in-situ research, the main arch ring is finally adjusted into a single-box three-chamber concrete box type arch in a cast-in-place mode, the height of the section is 2.0m, and the width is 8.80 m. The technology for prepressing the cast-in-place concrete of the main arch ring of the bridge is adopted, and the technology comprises the following steps:
(1) support system
The main arch ring concrete pouring of the bridge adopts a conventional steel arch support system, and is calculated according to the relevant standard requirements of a steel structure, 7 rows of 22 basic triangular steel arch frames are arranged, the total width of the steel arch frames is 8.62m, and the steel arch frames are transversely connected by special connecting pieces.
(2) Bottom die mounting
In order to meet the control requirement of the concrete pouring type of the main arch ring, an arch helmet is arranged after the steel arch frame is built, and wood piers with the length of 35cm, the width of 15cm and the height h (h is arranged according to the actual measurement distance) are longitudinally arranged on the stock-type steel arch frame every 80 cm; arranging square timber with the length of 10m, the width of 12cm and the height of 15cm on the wooden pier in the transverse bridge direction; longitudinal square timbers with the width of 4cm, the height of 5cm and the distance of 25cm are arranged on the transverse square timbers, and wood templates with the thickness of 1.4cm are paved on the longitudinal square timbers to form a bottom template 8 of the main arch ring.
(3) Prepressing technique
1) Analysis and calculation of preload
According to the arrangement of the concrete pouring construction organization of the main arch ring, concrete is poured in three rings: the first ring is poured with bottom plate concrete (containing upper chamfer), the second ring is poured with web and installation cross slab, and the third ring is poured with top plate concrete (containing lower chamfer). And pouring the second ring concrete after the pouring strength of the first ring concrete reaches more than 90%. The dead weight of the concrete for pouring the second and third rings is shared by the arch ring bottom plate concrete and the steel arch frame, and according to the calculation and comparison of two construction states and the construction experience of the similar bridge, the increment of stress and deformation of the arch frame is smaller when the concrete for pouring the second and third rings is poured, so the maximum pre-pressing load weight of the steel arch frame is controlled by the maximum load weight of the concrete for pouring the first ring. When the first ring of concrete of the arch ring is poured, the maximum pouring weight is the weight of the bottom plate, the weight of the lower horse shoe, the weight of a template, a scaffold, construction load and the like, and the finally determined prepressing control load is 1.2 times of the weight of the bottom plate and the lower horse shoe.
2) Prepressing measures
The standard sand bags 5 uniformly manufactured by the utility model are pre-pressed, and each sand bag is 1.5t in weight.
3) Pre-pressing effect
During the prepressing of the main arch ring, the method is divided into two combinations, namely 100% load prepressing and 120% load prepressing, according to the standard requirements of bridge construction regulations, and the no-load elevation, the prepressing elevation and the unloading elevation of each part of the steel arch frame are continuously and comprehensively monitored, so that the results all meet the requirements.
Claims (5)
1. The utility model provides an arch bridge owner encircles a pre-compaction sand bag system of concrete braced system in situ which characterized in that: a plurality of sand bag fixing positions are uniformly arranged at the top surface prepressing position of the main arch ring bottom formwork (8), a single sand bag (5) is placed in each sand bag fixing position, and engineering production aggregate with constant weight is filled in each sand bag (5); the sand bag (5) is including the bag body, and the bottom reinforcement of the bag body is equipped with and holds in the palm end (4), and the vertical periphery of the bag body, middle waist and the reinforcement of top opening department are equipped with and consolidate shroud (3), and the top opening department of the bag body still symmetry is equipped with two suspender (1), consolidates shroud (3) and holds in the palm end (4) and make by double-deck material, is equipped with dress sand suitable for reading (2) along its hoop in bag body top opening lower part.
2. The arch bridge main arch ring cast-in-place concrete support system pre-pressing sand bag system of claim 1, wherein: both ends of each double-hanging strip (1) are fixedly connected with the vertical surrounding reinforcing strips (3) around the bag body.
3. The arch bridge main arch ring cast-in-place concrete support system pre-pressing sand bag system of claim 1, wherein: the sand bag fixed position is including following the fixed multirow vertical erection reinforcing bar (7) that set up of main arch ring die block board (8) width direction even interval, and every row of vertical erection reinforcing bar (7) top fixedly connected with 1 horizontal stand founds reinforcing bar (6), and the adjacent 2 vertical erection reinforcing bar (7) upper ends in same row are through vertical erection reinforcing bar (9) connection.
4. The arch bridge main arch ring cast-in-place concrete support system pre-pressing sand bag system of claim 3, wherein: the distance between two adjacent rows of vertical erection steel bars (7) is 5-10 cm larger than that of the sand bag (5), and the distance between 2 adjacent vertical erection steel bars (7) in the same row is 5-10 cm larger than that of the sand bag (5).
5. The arch bridge main arch ring cast-in-place concrete support system pre-pressing sand bag system of claim 1, wherein: each sand bag (5) is numbered in sequence.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120715018.5U CN215629394U (en) | 2021-04-08 | 2021-04-08 | Pre-pressing sand bag system of arch bridge main arch ring cast-in-place concrete supporting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120715018.5U CN215629394U (en) | 2021-04-08 | 2021-04-08 | Pre-pressing sand bag system of arch bridge main arch ring cast-in-place concrete supporting system |
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| CN215629394U true CN215629394U (en) | 2022-01-25 |
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| CN202120715018.5U Active CN215629394U (en) | 2021-04-08 | 2021-04-08 | Pre-pressing sand bag system of arch bridge main arch ring cast-in-place concrete supporting system |
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| Country | Link |
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- 2021-04-08 CN CN202120715018.5U patent/CN215629394U/en active Active
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