CN110512613B - Red sandstone layer water-resisting shotcrete supporting method and water-resisting device thereof - Google Patents
Red sandstone layer water-resisting shotcrete supporting method and water-resisting device thereof Download PDFInfo
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- CN110512613B CN110512613B CN201910730465.5A CN201910730465A CN110512613B CN 110512613 B CN110512613 B CN 110512613B CN 201910730465 A CN201910730465 A CN 201910730465A CN 110512613 B CN110512613 B CN 110512613B
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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
Abstract
The invention discloses a water-proof spray anchor supporting method for a red sandstone layer, which comprises the following steps: a. carrying out vertical layering and horizontal segmented excavation on earthwork between piles; b. after vertical layering and horizontal segmentation excavation; c. b, fixedly arranging plastic cloth in the vertical pit excavated in the step b; d. c20 fine stone concrete with the thickness not less than 80mm is sprayed on the mesh fabric of the steel bars in the step C. The invention also discloses a water-resisting device of the red sandstone layer water-resisting shotcrete supporting method, which comprises plastic cloth, wherein the plastic cloth is vertically installed on the wall surface of the inter-pile rock mass of the supporting pile, a steel reinforcement framework is fixedly installed outside the plastic cloth, a grass curtain is fixedly installed outside the steel reinforcement framework, and a steel mesh is fixedly installed outside the grass curtain. The invention solves the problem that the supporting surface is difficult to support or cracks are generated on the supporting surface and even bulges fall off due to water seepage of the pebble bed at the top of the red sandstone layer after the red sandstone layer is supported due to the characteristics of the rock soil of the red sandstone layer.
Description
Technical Field
The invention relates to the technical field of supporting methods, in particular to a red sandstone layer water-resisting spray anchor supporting method and a water-resisting device thereof.
Background
In recent years, with the development of national economy, basements in main urban areas of cities have a deeper and deeper trend, most basements of newly-built residences are designed with 2-3 floors, and foundation pit support is particularly important for ensuring the safety of surrounding buildings.
For the deep foundation pit, the supporting form is various, the economy, the safety and the applicability are considered, the deep foundation pit supporting mostly takes pile anchor supporting as a main part, the underground water level condition is combined, and the comprehensive supporting precipitation mode of 'pile anchor + pipe well + water collection and surface drainage' or 'secant pile water stop + anchor cable + pipe well precipitation' is taken as a main part
However, when the rock stratum in the foundation pit is the red sandstone, due to the characteristics of the rock stratum, after the red sandstone is supported, the supporting surface is difficult to support or cracks are generated on the supporting surface and even the bulge is fallen off due to water seepage of the pebble layer at the top of the red sandstone layer.
Disclosure of Invention
Aiming at the technical problems, the invention provides a water-proof spray anchor supporting method for a red sandstone layer, which can solve the problem that due to the characteristics of rock soil of the red sandstone layer, after the red sandstone layer is supported, the supporting surface is difficult to support or cracks are generated on the supporting surface and even bulges fall off due to water seepage of a pebble layer at the top of the red sandstone layer.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a red sandstone layer water-resisting shotcrete supporting method comprises the following steps:
a. after the foundation pit is constructed by supporting piles, carrying out vertical layering and horizontal segmented excavation on earthwork between piles;
b. after vertical layering and horizontal sectional excavation, excavating the excavation surface again along the direction vertical to the foundation pit supporting surface to expose the pile body;
c. b, fixedly arranging plastic cloth in the vertical pit excavated in the step b, fixedly installing a reinforcement cage on the plastic cloth, fixedly installing a grass curtain outside the reinforcement cage, and fixedly installing a reinforcement mesh outside the grass curtain;
d. c20 fine stone concrete with the thickness not less than 80mm is sprayed on the reinforcing mesh sheets in the step C to be combined with the pile body to form the composite reinforced waterproof concrete retaining wall.
In the step a, the excavation height of each layer is not more than 2m below the last supporting surface, and the length of the horizontal sections is determined according to the site construction speed.
And in the step b, excavating the excavation surface again along the direction vertical to the foundation pit supporting surface, and making the recess between the two piles be 250mm and 350 mm.
In the step c, the thickness of the plastic cloth is not less than 1 mm.
And c, fixing the grass curtain on the steel bar framework by using binding wires to ensure that the grass curtain tightly presses the plastic cloth to be attached to the sandstone surface layer.
In the step c, the thickness of the straw curtain is not less than 40 mm.
And c, binding the reinforcing mesh sheets on the outer sides of the reinforcing cages by using binding wires to form the composite stressed cage.
In the step c, the transverse and longitudinal spacing of the mesh of the reinforcing steel bar mesh is 200mm multiplied by 200mm, and the diameter of the reinforcing steel bar is 6 mm.
In the step c, the vertical interval of the steel bars of the steel bar framework is the pile interval minus the diameter of the pile, the steel bars are arranged in the horizontal direction according to 500mm, the steel bars are planted at the horizontal and vertical connection positions of the steel bar framework, the steel bar framework and the planted steel bars are welded and fixed with each other, and the depth of the planted steel bars is larger than 240 mm.
The water-resisting device of the red sandstone layer water-resisting shotcrete supporting method comprises plastic cloth, wherein the plastic cloth is vertically installed on an inter-pile rock wall surface of a supporting pile, a steel reinforcement framework is fixedly installed outside the plastic cloth, a grass curtain is fixedly installed outside the steel reinforcement framework, and a steel mesh is fixedly installed outside the grass curtain.
The invention has the beneficial effects that: the method comprises the steps of firstly using plastic cloth to block water, then welding a steel reinforcement framework, planting steel reinforcements on a pile body to connect the steel reinforcement framework, fixing a straw curtain on the steel reinforcement framework, binding a steel reinforcement net sheet with the size of 200 multiplied by 200mm on the outer side, spraying C20 fine-stone concrete on the outermost side, and finally repairing a catchment open drain underground water at the root of a foundation pit support. The invention can effectively support the surface layer of the foundation pit, the plastic cloth can separate the upper seepage water from the supporting surface, the newly added straw curtain increases the friction force of the side wall, provides an operation environment for spraying concrete, and the reinforcement framework and the reinforcement mesh are combined to form a reinforced structure, thereby effectively preventing collapse caused by expansion of sandstone in water and reduction of cohesive force. The invention can also ensure the strength of the foundation pit anchor-spraying surface layer, effectively control the settlement deformation of foundation pit engineering, prolong the durability of foundation pit support, and ensure the safety of a foundation pit support structure and an adjacent structure building, wherein, C20 fine stone concrete with the thickness of not less than 80mm is sprayed on the reinforcing mesh in the step C, the aim is to improve the strength of the whole support surface, in the step a, the excavation height of each layer is not more than 2m below the last support surface, the aim is to prevent the collapse or the downward movement of the upper support surface, in the step b, 250-350mm is recessed between two piles, the aim is to provide an installation space for the subsequent placement of plastic, grass curtain and a reinforcing steel bar framework between the two piles, and provide a position bar-planting position, the thickness of the plastic cloth is not less than 1mm, the aim is to prevent the plastic cloth from leaking in the construction process, the construction difficulty is increased, and the thickness of the, the aim is to prevent the concrete from being sprayed, the stones penetrate through the grass curtains to break through the plastic cloth, the transverse and longitudinal spacing of the mesh grids of the reinforcing mesh is 200mm multiplied by 200mm, the diameter of the reinforcing steel bar is 6mm, the aim is to improve the overall tensile strength, the vertical spacing of the reinforcing steel bars of the reinforcing steel bar framework is the distance between the piles minus the diameter of the piles, the reinforcing steel bars are arranged one way in the horizontal direction according to 500mm, and the planting depth is larger than 240mm, so that the reinforcing steel bar framework is used as a stress framework for spraying the concrete, the reinforcing steel.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Detailed Description
Example 1
As shown in fig. 1, the water-resisting device of the red sandstone layer water-resisting shotcrete supporting method comprises plastic cloth 1, wherein the plastic cloth 1 is vertically installed on the wall surface of an inter-pile rock body of a supporting pile, a steel reinforcement framework 2 is fixedly installed outside the plastic cloth 1, a grass curtain 3 is fixedly installed outside the steel reinforcement framework 2, and a steel mesh 4 is fixedly installed outside the grass curtain 3.
A red sandstone layer water-resisting shotcrete supporting method comprises the following steps:
a. after supporting pile construction is carried out on a foundation pit, vertical layering and horizontal segmentation excavation are carried out on earthwork between piles, the excavation height of each layer is 2m below a supporting surface last time, and the length of a horizontal segmentation is determined according to the site construction speed;
b. after vertical layering and horizontal sectional excavation, excavating the excavation surface again along the direction vertical to the foundation pit supporting surface to expose the pile body, and excavating the excavation surface again along the direction vertical to the foundation pit supporting surface to enable the two piles to be recessed by 250 mm;
c. fixedly arranging a plastic cloth 1 in the vertical pit excavated in the step b, fixedly installing a steel reinforcement framework 2 on the plastic cloth 1, the grass curtain 3 is fixedly installed outside the steel reinforcement framework 2, the steel reinforcement net piece 4 is fixedly installed outside the grass curtain 3, the thickness of the plastic cloth 1 is 1mm, the grass curtain 3 is fixed on the steel reinforcement framework 2 through binding wires, the plastic cloth 1 is tightly pressed and stuck on a sandstone surface layer through the grass curtain 3, the thickness of the grass curtain 3 is 40mm, the steel reinforcement net piece 4 is bound on the outer side of the steel reinforcement framework 2 through the binding wires to form a composite stress framework, the transverse and longitudinal spacing of grids of the steel reinforcement net piece 4 is 200mm multiplied by 200mm, the diameter of the steel reinforcement is 6mm, the vertical spacing of steel reinforcements of the steel reinforcement framework 2 is the pile spacing minus the pile diameter, one pile is arranged in the horizontal direction according to 500, planting bars at the horizontal and vertical connection part of the steel bar framework 2, and welding and fixing the steel bar framework 2 and the planted bars, wherein the depth of the planted bars is 250 mm;
d. c20 fine stone concrete 5 with the thickness of 80mm is sprayed on the reinforcing mesh sheets in the step C, and the reinforcing mesh sheets are combined with the pile body to form the composite reinforced waterproof concrete retaining wall.
Example 2
As shown in fig. 1, the water-resisting device of the red sandstone layer water-resisting shotcrete supporting method comprises plastic cloth 1, wherein the plastic cloth 1 is vertically installed on the wall surface of an inter-pile rock body of a supporting pile, a steel reinforcement framework 2 is fixedly installed outside the plastic cloth 1, a grass curtain 3 is fixedly installed outside the steel reinforcement framework 2, and a steel mesh 4 is fixedly installed outside the grass curtain 3.
A red sandstone layer water-resisting shotcrete supporting method comprises the following steps:
a. after supporting pile construction is carried out on a foundation pit, vertical layering and horizontal segmentation excavation are carried out on earthwork between piles, the excavation height of each layer is 1.5m below a supporting surface last time, and the length of a horizontal segmentation is determined according to the site construction speed;
b. after vertical layering and horizontal sectional excavation, excavating the excavation surface again along the direction vertical to the foundation pit supporting surface to expose the pile body, and excavating the excavation surface again along the direction vertical to the foundation pit supporting surface to enable the two piles to be recessed by 350 mm;
c. fixedly arranging a plastic cloth 1 in the vertical pit excavated in the step b, fixedly installing a steel reinforcement framework 2 on the plastic cloth 1, the grass curtain 3 is fixedly installed outside the steel reinforcement framework 2, the steel reinforcement net piece 4 is fixedly installed outside the grass curtain 3, the thickness of the plastic cloth 1 is 1.5mm, the grass curtain 3 is fixed on the steel reinforcement framework 2 through binding wires, the plastic cloth 1 is tightly pressed and stuck on a sandstone surface layer through the grass curtain 3, the thickness of the grass curtain 3 is 45mm, the steel reinforcement net piece 4 is bound on the outer side of the steel reinforcement framework 2 through the binding wires to form a composite stress framework, the transverse and longitudinal spacing of grids of the steel reinforcement net piece 4 is 200mm multiplied by 200mm, the diameter of the steel reinforcement is 6mm, the vertical spacing of the steel reinforcement framework 2 is the pile spacing minus the pile diameter, and the vertical spacing of the steel reinforcement of the, planting bars at the horizontal and vertical connection part of the steel bar framework 2, and welding and fixing the steel bar framework 2 and the planted bars, wherein the depth of the planted bars is 260 mm;
d. c20 fine stone concrete 5 with the thickness of 85mm is sprayed on the reinforcing mesh sheets in the step C, and the reinforcing mesh sheets are combined with the pile body to form the composite reinforced waterproof concrete retaining wall.
Claims (9)
1. A water-resisting shotcrete supporting method for a red sandstone layer is characterized by comprising the following steps:
a. after the foundation pit is constructed by supporting piles, carrying out vertical layering and horizontal segmented excavation on earthwork between piles;
b. after vertical layering and horizontal sectional excavation, excavating the excavation surface again along the direction vertical to the foundation pit supporting surface to expose the pile body;
c. b, fixedly arranging plastic cloth (1) in the vertical pit excavated in the step b, fixedly installing a reinforcement cage (2) on the plastic cloth (1), connecting the reinforcement cage (2) through embedded steel bars of the pile body, fixedly installing a grass curtain (3) outside the reinforcement cage (2), and fixedly installing a reinforcement mesh (4) outside the grass curtain (3);
d. c20 fine stone concrete (5) with the thickness not less than 80mm is sprayed on the reinforcing mesh sheets in the step C, and the reinforcing mesh sheets are combined with the pile body to form the composite reinforced waterproof concrete retaining wall;
still include the water proof device, the water proof device includes plastic sheeting (1), plastic sheeting (1) outside fixed mounting steel reinforcement skeleton (2), steel reinforcement skeleton (2) outside fixed mounting grass curtain (3), grass curtain (3) outside fixed mounting reinforcing bar net piece (4).
2. The red sandstone layer water-resisting shotcrete supporting method according to claim 1, wherein the method comprises the following steps: in the step a, the excavation height of each layer is not more than 2m below the last supporting surface, and the length of the horizontal sections is determined according to the site construction speed.
3. The red sandstone layer water-resisting shotcrete supporting method according to claim 1, wherein the method comprises the following steps: and in the step b, excavating the excavation surface again along the direction vertical to the foundation pit supporting surface, and making the recess between the two piles be 250mm and 350 mm.
4. The red sandstone layer water-resisting shotcrete supporting method according to claim 1, wherein the method comprises the following steps: in the step c, the thickness of the plastic cloth (1) is not less than 1 mm.
5. The red sandstone layer water-resisting shotcrete supporting method according to claim 1, wherein the method comprises the following steps: in the step c, the grass curtain (3) is fixed on the steel bar framework (2) through binding wires, and the plastic cloth (1) is tightly pressed and attached to the sandstone surface layer through the grass curtain (3).
6. The red sandstone layer water-resisting shotcrete supporting method according to claim 1 or 5, wherein: in the step c, the thickness of the grass curtain (3) is not less than 40 mm.
7. The red sandstone layer water-resisting shotcrete supporting method according to claim 1, wherein the method comprises the following steps: and in the step c, binding the reinforcing mesh (4) by using binding wires at the outer side of the reinforcing cage (2) to form a composite stressed cage.
8. The red sandstone layer water-resisting shotcrete supporting method according to claim 1 or 7, wherein: in the step c, the transverse and longitudinal spacing of the meshes of the reinforcing steel mesh (4) is 200mm multiplied by 200mm, and the diameter of the reinforcing steel is 6 mm.
9. The red sandstone layer water-resisting shotcrete supporting method according to claim 1, wherein the method comprises the following steps: in the step c, the vertical interval of the steel bars of the steel bar framework (2) is the pile interval minus the diameter of the pile, one pile is arranged in the horizontal direction according to 500mm, steel bars are planted at the horizontal and vertical connection positions of the steel bar framework (2), the steel bar framework (2) and the planted steel bars are welded and fixed with each other, and the depth of the planted steel bars is larger than 240 mm.
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| 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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