CN114351746B - Mountain area river-following steep bank slope pile foundation platform and construction method - Google Patents
Mountain area river-following steep bank slope pile foundation platform and construction method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 38
- 239000004575 stone Substances 0.000 claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 claims description 53
- 239000010959 steel Substances 0.000 claims description 53
- 239000011435 rock Substances 0.000 claims description 28
- 238000005553 drilling Methods 0.000 claims description 19
- 239000011449 brick Substances 0.000 claims description 16
- 238000005266 casting Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000004927 clay Substances 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000009412 basement excavation Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000003973 paint Substances 0.000 claims description 6
- 238000009933 burial Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000011469 building brick Substances 0.000 claims 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
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Abstract
The invention provides a pile foundation platform for a mountain area river-facing steep bank slope and a construction method, the pile foundation platform comprises a pile foundation, wherein the pile foundation is positioned above the mountain area river-facing steep bank slope, and a rubble concrete retaining wall is arranged at the tops of the pile foundation and the mountain area river-facing steep bank slope; and a bearing platform is fixed at the top of the sheet stone concrete retaining wall. The construction of pile foundations on the river facing bank slope can be ensured, and the construction quality and personnel safety are ensured.
Description
Technical Field
The invention belongs to the technical field of bridge pile foundation construction, and particularly relates to a mountain area river-following steep bank slope pile foundation platform and a construction method.
Background
Along with the leap development of bridge design and construction technology in China, more and more bridges are erected between mountain areas. In mountain area, special structure bridges (continuous beams, rigid frame bridges, arch bridges, cable-stayed bridges, arch bridges and the like) are generally adopted to span larger valleys and rivers, and in order to reduce engineering cost, the main bridge span of the bridge is shortened as much as possible. The main pier pile foundation is arranged on the steep bank slope close to the river bank, and great difficulty is brought to construction organization and safety management.
In a steep slope section of a mountain area, a commonly adopted pile foundation construction method is manual layer-by-layer excavation and layer-by-layer dado pore-forming. The operators have to work in a narrow space, the safety risk is extremely high due to factors such as the influence of ventilation, hole wall stability and the like, and after the pile foundation of a steep slope section close to the river bank is excavated to a certain depth, water rushes into the pile hole due to rock mass cracks and seepage influence, so that the safety risk is rapidly increased. Construction must be continued after precipitation treatment. The construction of the river-approaching steep bank slope in the mountain area by using manual hole digging is unfavorable for saving cost and has extremely high safety risk.
Disclosure of Invention
In view of the technical problems existing in the background technology, the mountain area river-approaching steep bank slope pile foundation platform and the construction method provided by the invention can ensure construction of the river-approaching bank slope pile foundation, construction quality and personnel safety.
In order to achieve the technical characteristics, the aim of the invention is realized in the following way: the pile foundation platform comprises a pile foundation, wherein the pile foundation is positioned above a mountain area river-facing steep bank slope, and a piece-stone concrete retaining wall is arranged at the tops of the pile foundation and the mountain area river-facing steep bank slope; and a bearing platform is fixed at the top of the sheet stone concrete retaining wall.
The area of the sheet stone concrete retaining wall with the range of the bearing platform is longitudinally and outwardly expanded to be A, and the area of the sheet stone concrete retaining wall is transversely and outwardly expanded to be B.
The sheet stone concrete retaining wall is excavated into an inward-inclined step with a gradient of 1:0.5 by adopting an edge foundation, the original rock face is excavated into the inward-inclined step, and water interception and drainage of an excavation area of the sheet stone concrete retaining wall are finished.
The sheet stone concrete retaining wall is fixedly connected with the original rock face by adopting a twisted steel.
And a layer surface is reserved between the sheet stone concrete retaining walls to form a sheet stone stubble.
The inside of the sheet stone concrete retaining wall and the position where the pile foundation is located are provided with brick well rings, the inner diameter of each brick well ring is 10cm larger than the diameter of the pile foundation, and clay is backfilled in the well.
Steel pipe columns are pre-buried around the top layer of the sheet stone concrete retaining wall, and through-length cross bars are fixed at different heights of the steel pipe columns through steel pipe fasteners.
The construction method of the mountain area river-following steep bank slope pile foundation platform comprises the following steps:
Step one: firstly, constructing a main pier pile foundation construction channel;
step two: discharging the edge of the bearing platform, then carrying out slope surface cleaning and crushing stone slag and mud layer digging out within the range of the lateral extension dimension B of the outwards extension dimension A of the water surface side of the bearing platform to expose the middle weathered rock surface, and simultaneously arranging a water interception ditch at the top of the slope to lead the upper slope water flow out of the bearing platform;
step three: digging a base groove at the edge line of the clear meter range, wherein the base groove is inclined inwards;
Step four: digging an inward inclined step on the original rock surface after the surface cleaning, and drilling holes on the original rock surface, wherein the drilling holes are arranged in a quincuncial shape and avoid the plane position of a pile foundation, and cleaning the holes in time after the drilling is finished; machining the deformed steel bars into equal length sections, inserting the deformed steel bars into the drilled holes, and grouting in time;
Step five: pouring slope concrete of a first bin of the foundation trench, and filling gaps in the rock with concrete;
Step six: at least 50% of the rubble exposed bin surface of each bin of rubble concrete is 15-30cm away from the bin surface, so that a reserved rubble stubble is formed on the layer surface of the next bin, and the rubble stubble is covered with geotechnical cloth in time for watering and curing after pouring is finished;
Step seven: casting a sheet stone concrete retaining wall in each bin according to a set height H, when the pile foundation hole site is completely located on a certain casting layer, discharging the pile hole site on the casting layer, forming a brick well ring by brick construction according to the size requirement that the inner diameter is larger than the pile site, and backfilling clay in the brick well ring;
step eight: pouring the sheet stone concrete retaining wall layer by layer to the pile top elevation, and building the brick well ring to the pile top elevation along with building, wherein the top surface is polished and plastered to form a drainage slope surface on four sides;
Step nine: when the construction platform is used for pouring the topmost surface, steel pipe columns are pre-embedded at the outer sides of the periphery of the top surface, a plurality of through length cross bars are arranged at different elevations of the steel pipe columns, the steel pipe columns are connected with the through length cross bars through steel pipe fasteners, and red and white paint is brushed on the steel pipe columns;
Step ten: and driving the drilling machine into the platform, and starting the mechanical hole forming operation of the pile foundation.
The width of the channel in the first step is at least 6m, a road surface with mud and broken stone is adopted, and the drilling machine, the crane and the tank truck can be ensured to normally drive in; the slope support and water-proof drainage are timely applied to the excavated slope;
In the second step, the value of A is 3m, and the value of B is 2m;
In the third step, the base groove is inclined inwards by 1:0.5;
The step four is that the inward inclined step of the excavation of the original rock face is 4%, phi 30mm holes are drilled on the slope, the hole depth is 500mm, and the distance is 75cm x 75cm; the length of the twisted steel is 1 m/section, and the diameter is phi 28mm;
And in the fifth step, the concrete pouring height of the slope surface of the first bin is 1.5m, the thickness of the pouring layer is controlled to be 30cm in the pouring process, and the casting of the sheet stones is performed in the pouring process, so that the concrete is vibrated in time.
Setting the height H to be 1.5m in the step seven;
in the step nine, steel pipe columns with phi 48 multiplied by 3.5mm are pre-buried on the outer sides of the periphery of the top surface, the burial depth of the steel pipe columns is 50cm, the steel pipe columns extend out of the platform surface by 120cm, the distance is 200cm, 2 through long cross bars are arranged at the positions with the height of 60cm and 120cm, the steel pipe columns are connected with the through long cross bars through steel pipe fasteners, and the steel pipe columns are painted with paint between red and white at the distance of 20cm.
The invention has the following beneficial effects:
1. The invention effectively solves the construction problem of the pile foundation of the steep bank slope of the mountain area adjacent to the river, and compared with the traditional manual hole digging and precipitation construction method, the safety performance is greatly improved; compared with the method for erecting the steel platform, the method has obvious economical efficiency.
2. The invention adopts the prior slope rock mass to be provided with the screw thread reinforcing steel bars as anchor bars, and the reserved rock stubble-connecting measures of the reserved layer on the top surface of each cabin of the rock concrete pouring layer effectively ensure the stability of the slope of the mountain and the integral stability of the newly built rock concrete platform, thereby ensuring the construction safety.
3. The invention adopts prefabricated brick well rings and filled clay at the pile position to provide guidance for pile foundation construction and ensure the verticality of drilling; meanwhile, the clay is filled and the whole clay is built by the sheet stone concrete, so that the engineering cost can be saved, and the drilling speed is increased.
4. The invention can be widely applied to the construction of the pile foundation of the steep bank slope of the mountain area adjacent to the river.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a schematic view of a mountain area steep bank pile foundation platform of the invention.
Fig. 2 is a schematic diagram of a pile foundation platform excavation boundary of the present invention.
Fig. 3 is a schematic structural view of a slab concrete retaining wall of the present invention poured to a certain height.
In the figure: bearing platform 1, brick well ring 2, sheet stone concrete retaining wall 3, pile foundation 4, primary rock face 5, water line 6, twisted steel 7, and reserved sheet stone stubble 8.
Detailed Description
Example 1:
Referring to fig. 1-3, a pile foundation platform for a mountain area river-following steep bank slope comprises a pile foundation 4, wherein the pile foundation 4 is positioned above the mountain area river-following steep bank slope, and a sheet stone concrete retaining wall 3 is arranged at the tops of the pile foundation 4 and the mountain area river-following steep bank slope; and a bearing platform 1 is fixed at the top of the sheet stone concrete retaining wall 3. By the pile foundation platform, the pile foundation construction on the river bank slope can be realized, and the construction quality and personnel safety are ensured.
Furthermore, the area of the chip concrete retaining wall 3, which is in the range of the bearing platform 1, is expanded longitudinally to be A, and expanded transversely to be B. By adopting the above-mentioned enlarged size range, the stability and reliability of the finally supported platform 1 are ensured.
Furthermore, the sheet stone concrete retaining wall 3 is excavated into an inward-inclined step with a gradient of 1:0.5 by adopting an edge foundation, the original rock face is excavated into the inward-inclined step, and water interception and drainage of the excavated area of the sheet stone concrete retaining wall 3 are finished. The subsequent stability of slope construction is guaranteed through intercepting and draining water, and the stability and reliability of the foundation are enhanced through setting the steps with the inward inclination of 1:0.5 gradient.
Furthermore, the sheet stone concrete retaining wall 3 is fixedly connected with the original rock face by adopting a twisted steel 7. The connection strength and stability between the sheet stone concrete retaining wall 3 and the original rock face are enhanced by the screw thread reinforcing steel bars 7.
Further, a layer surface reserved piece stubble 8 is formed between the piece concrete retaining walls 3. The stability of the slope surface of the mountain and the overall stability of the newly built rubble concrete platform are effectively ensured by adopting the reserved rubble stubble 8 on the layer surface, so that the construction safety is ensured.
Further, the brick well ring 2 is arranged in the stone concrete retaining wall 3 and positioned at the pile foundation 4, the inner diameter of the brick well ring 2 is 10cm larger than the diameter of the pile foundation, and clay is backfilled in the well. The clay is backfilled in the well to provide guidance for pile foundation construction, so that the drilling verticality is ensured; meanwhile, the clay is filled and the whole clay is built by the sheet stone concrete, so that the engineering cost can be saved, and the drilling speed is increased.
Further, steel pipe columns are pre-buried around the top layer of the sheet stone concrete retaining wall 3, and through-length cross bars are fixed at different heights of the steel pipe columns through steel pipe fasteners. Through foretell steel pipe stand and logical long horizontal pole fixed link to each other, can form guardrail structure.
Example 2:
the construction method of the mountain area river-following steep bank slope pile foundation platform comprises the following steps:
Step one: firstly, constructing a main pier pile foundation construction channel;
Step two: discharging the edge of the bearing platform 1, then outwards extending to the water surface side of the bearing platform by a dimension A, cleaning the slope surface and digging broken stone slag and mud layers within a range of a transverse extending dimension B to expose the middle weathered rock surface, and simultaneously arranging a water intercepting ditch at the top of the slope to lead the upper slope water flow out of the bearing platform;
step three: digging a base groove at the edge line of the clear meter range, wherein the base groove is inclined inwards;
Step four: digging an inward inclined step on the original rock surface after surface cleaning, and drilling holes on the original rock surface, wherein the drilling holes are arranged in a quincuncial shape and avoid the plane position of the pile foundation 4, and cleaning the holes in time after the drilling is finished; machining the deformed bar 7 into equal length sections, inserting the deformed bar 7 into the drilled hole, and grouting in time;
Step five: pouring slope concrete of a first bin of the foundation trench, and filling gaps in the rock with concrete;
step six: at least 50% of the rubble exposed bin surface of each bin of rubble concrete is 15-30cm away from the bin surface, so that a reserved rubble stubble 8 is formed on the layer surface of the next bin, and the rubble is covered with geotechnical cloth in time for watering and curing after pouring is finished;
step seven: casting a sheet stone concrete retaining wall 3 in each bin according to a set height H, when the pile foundation hole site is completely located on a certain casting layer, discharging the pile hole site on the casting layer, forming a bricked well ring 2 by bricking according to the size requirement that the inner diameter is larger than the pile site, and backfilling clay in the bricked well ring 2;
Step eight: pouring the sheet stone concrete retaining wall 3 layer by layer to the pile top elevation, and building the brick well ring 2 to the pile top elevation along with building, wherein the top surface is polished and plastered to form a drainage slope surface facing four sides;
Step nine: when the construction platform is used for pouring the topmost surface, steel pipe columns are pre-embedded at the outer sides of the periphery of the top surface, a plurality of through length cross bars are arranged at different elevations of the steel pipe columns, the steel pipe columns are connected with the through length cross bars through steel pipe fasteners, and red and white paint is brushed on the steel pipe columns;
Step ten: and driving the drilling machine into the platform, and starting the mechanical hole forming operation of the pile foundation.
Preferably, the width of the channel in the first step is at least 6m, and a road surface with the mud and the broken stone is adopted, so that the drilling machine, the crane and the tank truck can normally drive in; the slope support and water-proof drainage are timely applied to the excavated slope;
Preferably, in the second step, the value of a is 3m, and the value of b is 2m;
Preferably, in the third step, the base groove is inclined inwards by 1:0.5;
Preferably, the step four is that the inward-inclined step of the excavation of the original rock face is 4%, phi 30mm holes are drilled on the slope, the hole depth is 500mm, and the distance is 75cm x 75cm; the length of the twisted steel 7 is 1 m/section, and the diameter is phi 28mm;
Preferably, in the fifth step, the concrete casting height of the slope surface of the first bin is 1.5m, the thickness of the casting layer is controlled to be 30cm in the casting process, and the casting sheet stones are thrown in the casting process and vibrated in time.
Preferably, in the seventh step, the height H is set to 1.5m;
preferably, steel pipe columns with phi 48 multiplied by 3.5mm are pre-buried at the outer sides of the periphery of the top surface in the step nine, the burial depth of the steel pipe columns is 50cm, the steel pipe columns extend out of the platform surface by 120cm, the distance is 200cm, 2 through long cross bars are arranged at the positions with the height of 60cm and 120cm, the steel pipe columns are connected with the through long cross bars through steel pipe fasteners, and the steel pipe columns are brushed with paint in red and white intervals at the distance of 20cm.
Claims (3)
1. The construction method of the mountain area river-passing steep bank slope pile foundation platform comprises a pile foundation (4), wherein the pile foundation (4) is positioned above a mountain area river-passing steep bank slope, and a piece stone concrete retaining wall (3) is arranged at the tops of the pile foundation (4) and the mountain area river-passing steep bank slope; a bearing platform (1) is fixed at the top of the sheet stone concrete retaining wall (3);
The sheet stone concrete retaining wall (3) is excavated into an inward-inclined step with the gradient of 1:0.5 by adopting a side line foundation, an original rock face is excavated into an inward-inclined step, and water interception and drainage of an excavated area of the sheet stone concrete retaining wall (3) are finished;
The sheet stone concrete retaining wall (3) is fixedly connected with the original rock face by adopting a twisted steel bar (7);
A layer surface reserved stone stubble (8) is formed between the stone concrete retaining walls (3);
The inside of the sheet stone concrete retaining wall (3) and the position of the pile foundation (4) are provided with brick well rings (2), the inner diameter of each brick well ring (2) is 10cm larger than the diameter of the pile foundation, and clay is backfilled in the well;
the area of the chip concrete retaining wall (3) with the range of the bearing platform (1) is longitudinally and outwardly expanded to be A, and the area of the chip concrete retaining wall with the range of the bearing platform is transversely and outwardly expanded to be B;
Steel pipe columns are pre-buried around the top layer of the sheet stone concrete retaining wall (3), and through-length cross bars are fixed at different heights of the steel pipe columns through steel pipe fasteners;
The construction method is characterized by comprising the following steps of:
Step one: firstly, constructing a main pier pile foundation construction channel;
step two: discharging the edge of the bearing platform (1), then carrying out slope surface cleaning and crushing stone slag and mud layer digging out within the range of the lateral extension dimension B of the outwards extension dimension A of the water surface side of the bearing platform to expose the middle weathered rock surface, and simultaneously arranging a water interception ditch on the top of the slope to lead the upper slope water flow out of the bearing platform;
step three: digging a base groove at the edge line of the clear meter range, wherein the base groove is inclined inwards;
Step four: digging an inward inclined step on the original rock surface after surface cleaning, and drilling holes on the original rock surface, wherein the drilling holes are arranged in a quincuncial shape and avoid the plane position of a pile foundation (4), and cleaning the holes in time after the drilling is finished; machining the deformed bar (7) into equal length sections, inserting the deformed bar (7) into the drilled hole, and grouting in time;
Step five: pouring slope concrete of a first bin of the foundation trench, and filling gaps in the rock with concrete;
step six: at least 50% of the rubble exposed bin surface of each bin of rubble concrete is 15-30cm away from the bin surface, so that a reserved rubble stubble (8) is formed on the layer surface of the next bin, and the rubble is covered with an geotechnical cloth in time for sprinkling and curing after pouring is finished;
Step seven: casting a sheet stone concrete retaining wall (3) in each bin according to a set height H, when the pile foundation hole site is completely located on a certain casting layer, discharging the pile hole site on the casting layer, and building bricks to form a brick well ring (2) according to the size requirement that the inner diameter is larger than the pile site, and backfilling clay in the brick well ring (2);
Step eight: pouring a sheet stone concrete retaining wall (3) layer by layer to the elevation of the pile top, and building a brick well ring (2) to the elevation of the pile top along with building, wherein the top surface is polished and plastered to form a drainage slope surface on four sides;
Step nine: when the construction platform is used for pouring the topmost surface, steel pipe columns are pre-embedded at the outer sides of the periphery of the top surface, a plurality of through length cross bars are arranged at different elevations of the steel pipe columns, the steel pipe columns are connected with the through length cross bars through steel pipe fasteners, and red and white paint is brushed on the steel pipe columns;
Step ten: and driving the drilling machine into the platform, and starting the mechanical hole forming operation of the pile foundation.
2. The construction method of the mountain river-following steep bank slope pile foundation platform, according to claim 1, is characterized in that: the width of the channel in the first step is at least 6m, a road surface with mud and broken stone is adopted, and the drilling machine, the crane and the tank truck can be ensured to normally drive in; the slope support and water-proof drainage are timely applied to the excavated slope;
In the second step, the value of A is 3m, and the value of B is 2m;
In the third step, the base groove is inclined inwards by 1:0.5;
The step four is that the inward inclined step of the excavation of the original rock face is 4%, phi 30mm holes are drilled on the slope, the hole depth is 500mm, and the distance is 75cm x 75cm; the length of the twisted steel (7) is 1 m/section, and the diameter is phi 28mm;
And in the fifth step, the concrete pouring height of the slope surface of the first bin is 1.5m, the thickness of the pouring layer is controlled to be 30cm in the pouring process, and the casting of the sheet stones is performed in the pouring process, so that the concrete is vibrated in time.
3. The construction method of the mountain river-following steep bank slope pile foundation platform, according to claim 1, is characterized in that: setting the height H to be 1.5m in the step seven;
in the step nine, steel pipe columns with phi 48 multiplied by 3.5mm are pre-buried on the outer sides of the periphery of the top surface, the burial depth of the steel pipe columns is 50cm, the steel pipe columns extend out of the platform surface by 120cm, the distance is 200cm, 2 through long cross bars are arranged at the positions with the height of 60cm and 120cm, the steel pipe columns are connected with the through long cross bars through steel pipe fasteners, and the steel pipe columns are painted with paint between red and white at the distance of 20cm.
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| CN202111414504.4A CN114351746B (en) | 2021-11-25 | 2021-11-25 | Mountain area river-following steep bank slope pile foundation platform and construction method |
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| JP2002275907A (en) * | 2001-03-16 | 2002-09-25 | Toyo Constr Co Ltd | Stabilization construction method for slope |
| CN108755698A (en) * | 2018-05-25 | 2018-11-06 | 中铁建大桥工程局集团第工程有限公司 | A kind of big inclined rock base foundation construction method of abrupt slope incompact-deposit bodies |
| CN111779014A (en) * | 2020-06-30 | 2020-10-16 | 中铁二院工程集团有限责任公司 | High bearing platform enclosure structure of riverside steep slope bridge and construction method |
| WO2021109144A1 (en) * | 2019-12-06 | 2021-06-10 | 邹胜斌 | Modular intelligent dado cast-in-place pile and construction process therefor |
| CN214530750U (en) * | 2021-06-04 | 2021-10-29 | 中铁十七局集团有限公司 | Bridge pile foundation structure suitable for rock mass abrupt slope |
| CN216640647U (en) * | 2021-11-25 | 2022-05-31 | 中国葛洲坝集团路桥工程有限公司 | Mountain area is faced river steep bank slope pile foundation platform |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106436748A (en) * | 2016-07-04 | 2017-02-22 | 中国电建集团华东勘测设计研究院有限公司 | Rock anchor foundation structure applicable to mountain photovoltaic assembly and construction method thereof |
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- 2021-11-25 CN CN202111414504.4A patent/CN114351746B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002275907A (en) * | 2001-03-16 | 2002-09-25 | Toyo Constr Co Ltd | Stabilization construction method for slope |
| CN108755698A (en) * | 2018-05-25 | 2018-11-06 | 中铁建大桥工程局集团第工程有限公司 | A kind of big inclined rock base foundation construction method of abrupt slope incompact-deposit bodies |
| WO2021109144A1 (en) * | 2019-12-06 | 2021-06-10 | 邹胜斌 | Modular intelligent dado cast-in-place pile and construction process therefor |
| CN111779014A (en) * | 2020-06-30 | 2020-10-16 | 中铁二院工程集团有限责任公司 | High bearing platform enclosure structure of riverside steep slope bridge and construction method |
| CN214530750U (en) * | 2021-06-04 | 2021-10-29 | 中铁十七局集团有限公司 | Bridge pile foundation structure suitable for rock mass abrupt slope |
| CN216640647U (en) * | 2021-11-25 | 2022-05-31 | 中国葛洲坝集团路桥工程有限公司 | Mountain area is faced river steep bank slope pile foundation platform |
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