CN110512613A - A kind of red sand rock stratum water proof combined bolting and shotcrete method and its water barrier device - Google Patents
A kind of red sand rock stratum water proof combined bolting and shotcrete method and its water barrier device Download PDFInfo
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- CN110512613A CN110512613A CN201910730465.5A CN201910730465A CN110512613A CN 110512613 A CN110512613 A CN 110512613A CN 201910730465 A CN201910730465 A CN 201910730465A CN 110512613 A CN110512613 A CN 110512613A
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- rock stratum
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- sand rock
- water proof
- red sand
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- Mining & Mineral Resources (AREA)
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Abstract
The invention discloses a kind of red sand rock stratum water proof combined bolting and shotcrete methods, excavate method includes the following steps: a. carries out vertical layered and horizontal fragmentation to inter-pile soil side；B. after vertical layered and horizontal fragmentation excavates；C. plastic cloth is fixedly installed in the vertical hole excavated in stepb；D. C20 pea gravel concreten of the jet thickness not less than 80mm on the reinforced mesh in step c.The invention also discloses a kind of water barrier devices of red sand rock stratum water proof combined bolting and shotcrete method, the device includes plastic cloth, the plastic cloth is vertically installed between the stake of support pile on rock mass metope, framework of steel reinforcement is fixedly mounted outside the plastic cloth, straw screen or mat is fixedly mounted outside the framework of steel reinforcement, reinforced mesh is fixedly mounted outside the straw screen or mat.The present invention is solved due to red sand rock stratum ground feature, and after to Red Sandstone supporting, branch mask often will appear due to boulder bed infiltration at the top of red sand rock stratum and be difficult to supporting or branch mask cracks the problem of even bulge falls off.
Description
Technical field
The present invention relates to method for protecting support technical field, in particular to a kind of red sand rock stratum water proof combined bolting and shotcrete method and its every
Water installations.
Background technique
In recent years, with the development of national economy, city main city zone basement shows deeper and deeper trend, most of
New Dwelling basement majority designs layer 2-3, and for the safety for guaranteeing periphery buildings or structures, pattern foundation pit supporting structure is particularly important.
For deep basal pit, support form is varied, considers economy, safety, applicability, deep foundation pit support is mostly with stake
Based on anchor supporting, in conjunction with level of ground water situation, with " piled anchor+pipe well+catchment bright row " or " interlocking pile sealing+anchor cable+pipe well drop
Based on water " comprehensive support dewatering mode
However, when in foundation pit rock stratum be Red Sandstone when, due to its ground feature, after to Red Sandstone supporting, branch mask due to
Boulder bed infiltration at the top of red sand rock stratum often will appear and be difficult to supporting or branch mask cracks the problem of even bulge falls off.
Summary of the invention
In view of the above technical problems, the present invention provides a kind of red sand rock stratum water proof combined bolting and shotcrete method, be able to solve by
In red sand rock stratum ground feature, after to Red Sandstone supporting, branch mask is due to boulder bed infiltration at the top of red sand rock stratum, often
Appearance is difficult to supporting or branch mask cracks the problem of even bulge falls off.
To achieve the goals above, technical solution of the present invention is specific as follows:
A kind of red sand rock stratum water proof combined bolting and shotcrete method, comprising the following steps:
A. after carrying out supporting pile driving construction to foundation pit, vertical layered and horizontal fragmentation is carried out to inter-pile soil side and is excavated；
B. after vertical layered and horizontal fragmentation excavates, to excavation face along excavating again perpendicular to pattern foundation pit supporting structure face, keep pile body sudden and violent
Dew；
C. plastic cloth is fixedly installed in the vertical hole excavated in stepb, framework of steel reinforcement is fixedly mounted on plastic cloth, in reinforcing bar
Straw screen or mat is fixedly mounted outside skeleton, reinforced mesh is fixedly mounted outside straw screen or mat；
D. C20 pea gravel concreten of the jet thickness not less than 80mm on the reinforced mesh in step c is formed multiple in conjunction with pile body
Close reinforcing bar water-proof concrete barricade.
In the step a, every layer of excavation height is not more than 2m from below last time branch mask, and horizontal fragmentation length is according to scene
Speed of application determines.
In the step b, to excavation face along excavating again perpendicular to pattern foundation pit supporting structure face, make to be recessed 250- between two
350mm。
In the step c, the thickness of plastic cloth is not less than 1mm.
In the step c, straw screen or mat is fixed on framework of steel reinforcement with tied silk, guarantees that plastic cloth compression is attached to sandstone by straw screen or mat
In surface layer.
In the step c, the thickness of straw screen or mat is not less than 40mm.
In the step c, tied silk assembling reinforcement mesh sheet is used on the outside of framework of steel reinforcement, forms composite force skeleton.
In the step c, the transverse and longitudinal spacing of reinforced mesh grid is 200mm × 200mm, and reinforcing bar is diameter 6mm.
In the step c, the steel bar vertical spacing of framework of steel reinforcement is that stake spacing subtracts a diameter, horizontal direction according to
500mm is laid together, and in level and the vertical handover position bar planting of framework of steel reinforcement, framework of steel reinforcement and bar planting are welded to each other fixation,
Bar planting depth is greater than 240mm.
A kind of water barrier device of red sand rock stratum water proof combined bolting and shotcrete method, including plastic cloth, the plastic cloth are vertically-mounted
Between the stake of support pile on rock mass metope, framework of steel reinforcement is fixedly mounted outside the plastic cloth, is fixed outside the framework of steel reinforcement
Straw screen or mat is installed, reinforced mesh is fixedly mounted outside the straw screen or mat.
The beneficial effects of the present invention are: the present invention first uses plastic cloth water proof, welded reinforcement skeleton is reprocessed, is planted in pile body
Muscle connects framework of steel reinforcement, and straw screen or mat is fixed on framework of steel reinforcement, and outside binds the reinforced mesh of 200 × 200mm, and outermost sprays C20
Pea gravel concreten finally repairs intercepting ditch in pattern foundation pit supporting structure root and catchments bright row's underground water.The present invention can be with effective support foundation pit face
Layer, plastic cloth can separate top seepage water and branch mask, and newly-increased straw screen or mat increases the frictional force of side wall, to spray coagulation
Soil provides operating environment, and framework of steel reinforcement and reinforced mesh are jointly formed reinforcement structure, effectively prevent sandstone water-swellable, adhesive aggregation
It collapses caused by the reduction of power.The present invention can also ensure that the intensity of foundation pit spray anchor surface layer, effectively control the sedimentation of base pit engineering
Deformation, extends the durability of pattern foundation pit supporting structure, ensure that the safety of foundation pit supporting construction and adjacent structure building, wherein in step c
In reinforced mesh on jet thickness be not less than 80mm C20 pea gravel concreten, the purpose is to improve the intensity of entire branch mask,
In step a, every layer of excavation height from below last time branch mask be not more than 2m, the purpose is to prevent upper layer branch mask collapse or under
It moves, in step b, 250-350mm is recessed between two, the purpose is to be subsequent placement plastics, straw screen or mat, reinforcing bar between two
Frame provides installation space, and provides position bar planting position, and the thickness of plastic cloth is not less than 1mm, and the purpose is to work progress bundles
Broken plastic cloth leak, increases difficulty of construction, and the thickness of straw screen or mat is not less than 40mm, when the purpose is to prevent gunite concrete, stone
It penetrates straw screen or mat and breaks plastic cloth, the transverse and longitudinal spacing of reinforced mesh grid is 200mm × 200mm, and reinforcing bar is diameter 6mm, mesh
Be to improve whole tensile strength, the steel bar vertical spacing of framework of steel reinforcement is that stake spacing subtracts a diameter, horizontal direction according to
500mm lay together, bar planting depth be greater than 240mm, the purpose is to for guarantee framework of steel reinforcement rigidity, as gunite concrete,
The stress frame of steel mesh etc..
Detailed description of the invention
Fig. 1 is the principle of the present invention figure.
Specific embodiment
Embodiment 1
As shown in Figure 1, a kind of water barrier device of red sand rock stratum water proof combined bolting and shotcrete method, including plastic cloth 1, plastic cloth 1 are vertical
It is mounted between the stake of support pile on rock mass metope, framework of steel reinforcement 2, fixed peace outside framework of steel reinforcement 2 is fixedly mounted outside plastic cloth 1
Straw screen or mat 3 is filled, reinforced mesh 4 is fixedly mounted outside straw screen or mat 3.
A kind of red sand rock stratum water proof combined bolting and shotcrete method, comprising the following steps:
A. after carrying out supporting pile driving construction to foundation pit, vertical layered and horizontal fragmentation is carried out to inter-pile soil side and is excavated, every layer is opened
Height is dug from 2m below last time branch mask, horizontal fragmentation length is determined according to site operation speed；
B. after vertical layered and horizontal fragmentation excavates, to excavation face along excavating again perpendicular to pattern foundation pit supporting structure face, keep pile body sudden and violent
Dew makes to be recessed 250mm between two to excavation face along excavating again perpendicular to pattern foundation pit supporting structure face；
C. plastic cloth 1 is fixedly installed in the vertical hole excavated in stepb, framework of steel reinforcement 2, In is fixedly mounted on plastic cloth 1
Straw screen or mat 3 is fixedly mounted outside framework of steel reinforcement 2, is fixedly mounted reinforced mesh 4 outside straw screen or mat 3, plastic cloth 1 with a thickness of 1mm, use
Straw screen or mat 3 is fixed on framework of steel reinforcement 2 by tied silk, guarantees that the compression of plastic cloth 1 is attached in sandstone surface layer by straw screen or mat 3, the thickness of straw screen or mat 3
For 40mm, tied silk assembling reinforcement mesh sheet 4 is used on the outside of framework of steel reinforcement 2, forms composite force skeleton, the transverse and longitudinal of 4 grid of reinforced mesh
Spacing is 200mm × 200mm, and reinforcing bar is diameter 6mm, and the steel bar vertical spacing of framework of steel reinforcement 2 is that stake spacing subtracts a diameter,
Horizontal direction is laid together according to 500mm, in level and vertical handover position bar planting, framework of steel reinforcement 2 and the bar planting of framework of steel reinforcement 2
It is welded to each other fixation, bar planting depth is 250mm；
D. the C20 pea gravel concreten 5 that jet thickness is 80mm on the reinforced mesh in step c, forms compound in conjunction with pile body
Reinforcing bar water-proof concrete barricade.
Embodiment 2
As shown in Figure 1, a kind of water barrier device of red sand rock stratum water proof combined bolting and shotcrete method, including plastic cloth 1, plastic cloth 1 are vertical
It is mounted between the stake of support pile on rock mass metope, framework of steel reinforcement 2, fixed peace outside framework of steel reinforcement 2 is fixedly mounted outside plastic cloth 1
Straw screen or mat 3 is filled, reinforced mesh 4 is fixedly mounted outside straw screen or mat 3.
A kind of red sand rock stratum water proof combined bolting and shotcrete method, comprising the following steps:
A. after carrying out supporting pile driving construction to foundation pit, vertical layered and horizontal fragmentation is carried out to inter-pile soil side and is excavated, every layer is opened
Height is dug from last time branch mask the following are 1.5m, horizontal fragmentation length is determined according to site operation speed；
B. after vertical layered and horizontal fragmentation excavates, to excavation face along excavating again perpendicular to pattern foundation pit supporting structure face, keep pile body sudden and violent
Dew makes to be recessed 350mm between two to excavation face along excavating again perpendicular to pattern foundation pit supporting structure face；
C. plastic cloth 1 is fixedly installed in the vertical hole excavated in stepb, framework of steel reinforcement 2, In is fixedly mounted on plastic cloth 1
Straw screen or mat 3 is fixedly mounted outside framework of steel reinforcement 2, is fixedly mounted reinforced mesh 4 outside straw screen or mat 3, plastic cloth 1 with a thickness of 1.5mm,
Straw screen or mat 3 is fixed on framework of steel reinforcement 2 with tied silk, guarantees that the compression of plastic cloth 1 is attached in sandstone surface layer by straw screen or mat 3, the thickness of straw screen or mat 3
Degree is 45mm, uses tied silk assembling reinforcement mesh sheet 4 on the outside of framework of steel reinforcement 2, forms composite force skeleton, the cross of 4 grid of reinforced mesh
Vertical spacing is 200mm × 200mm, and reinforcing bar is diameter 6mm, and it is straight that the steel bar vertical spacing of framework of steel reinforcement 2 is that stake spacing subtracts stake
Diameter, horizontal direction is laid together according to 500mm, in level and the vertical handover position bar planting of framework of steel reinforcement 2, framework of steel reinforcement 2 with
Bar planting is welded to each other fixation, and bar planting depth is 260mm；
D. the C20 pea gravel concreten 5 that jet thickness is 85mm on the reinforced mesh in step c, forms compound in conjunction with pile body
Reinforcing bar water-proof concrete barricade.
Claims (10)
1. a kind of red sand rock stratum water proof combined bolting and shotcrete method, which comprises the following steps:
A. after carrying out supporting pile driving construction to foundation pit, vertical layered and horizontal fragmentation is carried out to inter-pile soil side and is excavated；
B. after vertical layered and horizontal fragmentation excavates, to excavation face along excavating again perpendicular to pattern foundation pit supporting structure face, keep pile body sudden and violent
Dew；
C. plastic cloth (1) is fixedly installed in the vertical hole excavated in stepb, framework of steel reinforcement is fixedly mounted on plastic cloth (1)
(2), straw screen or mat (3) are fixedly mounted outside framework of steel reinforcement (2), reinforced mesh (4) is fixedly mounted outside straw screen or mat (3)；
D. C20 pea gravel concreten (5) of the jet thickness not less than 80mm, the shape in conjunction with pile body on the reinforced mesh in step c
At composite reinforcing steel bar water-proof concrete barricade.
2. a kind of red sand rock stratum water proof combined bolting and shotcrete method according to claim 1, it is characterised in that: in the step a,
Every layer of excavation height is not more than 2m from below last time branch mask, and horizontal fragmentation length is determined according to site operation speed.
3. a kind of red sand rock stratum water proof combined bolting and shotcrete method according to claim 1, it is characterised in that: in the step b,
To excavation face along excavating again perpendicular to pattern foundation pit supporting structure face, make to be recessed 250-350mm between two.
4. a kind of red sand rock stratum water proof combined bolting and shotcrete method according to claim 1, it is characterised in that: in the step c,
The thickness of plastic cloth (1) is not less than 1mm.
5. a kind of red sand rock stratum water proof combined bolting and shotcrete method according to claim 1, it is characterised in that: in the step c,
Straw screen or mat (3) is fixed on framework of steel reinforcement (2) with tied silk, guarantees that straw screen or mat (3) compress plastic cloth (1) and is attached in sandstone surface layer.
6. a kind of red sand rock stratum water proof combined bolting and shotcrete method according to claim 1 or 5, it is characterised in that: the step c
In, the thickness of straw screen or mat (3) is not less than 40mm.
7. a kind of red sand rock stratum water proof combined bolting and shotcrete method according to claim 1, it is characterised in that: in the step c,
Tied silk assembling reinforcement mesh sheet (4) is used on the outside of framework of steel reinforcement (2), forms composite force skeleton.
8. a kind of red sand rock stratum water proof combined bolting and shotcrete method according to claim 1 or claim 7, it is characterised in that: the step c
In, the transverse and longitudinal spacing of reinforced mesh (4) grid is 200mm × 200mm, and reinforcing bar is diameter 6mm.
9. a kind of red sand rock stratum water proof combined bolting and shotcrete method according to claim 1, it is characterised in that: in the step c,
The steel bar vertical spacing of framework of steel reinforcement (2) is that stake spacing subtracts a diameter, and horizontal direction is laid according to 500mm together, in reinforcing bar
The level of skeleton (2) is welded to each other fixation with vertical handover position bar planting, framework of steel reinforcement (2) and bar planting, and bar planting depth is greater than
240mm。
10. the water barrier device of -9 any a kind of red sand rock stratum water proof combined bolting and shotcrete methods according to claim 1, feature
It is, including plastic cloth (1), the plastic cloth (1) is vertically installed between the stake of support pile on rock mass metope, the plastic cloth
(1) external that framework of steel reinforcement (2) are fixedly mounted, straw screen or mat (3) are fixedly mounted outside the framework of steel reinforcement (2), the straw screen or mat (3) is external
It is fixedly mounted reinforced mesh (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910730465.5A CN110512613B (en) | 2019-08-08 | 2019-08-08 | Red sandstone layer water-resisting shotcrete supporting method and water-resisting device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910730465.5A CN110512613B (en) | 2019-08-08 | 2019-08-08 | Red sandstone layer water-resisting shotcrete supporting method and water-resisting device thereof |
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| CN110512613B CN110512613B (en) | 2021-06-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111648373A (en) * | 2020-05-15 | 2020-09-11 | 中铁六局集团有限公司 | Excavation supporting construction process for water-rich deep foundation pit fender pile gap |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111648373A (en) * | 2020-05-15 | 2020-09-11 | 中铁六局集团有限公司 | Excavation supporting construction process for water-rich deep foundation pit fender pile gap |
| CN111648373B (en) * | 2020-05-15 | 2021-11-09 | 中铁六局集团有限公司 | Excavation supporting construction process for water-rich deep foundation pit fender pile gap |
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| CN110512613B (en) | 2021-06-11 |
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