CN109518698B - Water-rich deep foundation pit support structure close to operating high-iron sand pebble layer and construction method thereof - Google Patents
Water-rich deep foundation pit support structure close to operating high-iron sand pebble layer and construction method thereof Download PDFInfo
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- CN109518698B CN109518698B CN201811566729.XA CN201811566729A CN109518698B CN 109518698 B CN109518698 B CN 109518698B CN 201811566729 A CN201811566729 A CN 201811566729A CN 109518698 B CN109518698 B CN 109518698B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 239000004576 sand Substances 0.000 title claims abstract description 27
- 238000010276 construction Methods 0.000 title claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 14
- 229910052742 iron Inorganic materials 0.000 title claims description 14
- 238000005553 drilling Methods 0.000 claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 239000004567 concrete Substances 0.000 claims abstract description 14
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 6
- 238000004080 punching Methods 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 abstract description 3
- 238000001556 precipitation Methods 0.000 abstract description 3
- 238000005266 casting Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
Classifications
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
Abstract
A support structure of a foundation pit with a rich water depth and a construction method thereof are provided, which are close to an operation high-speed railway and are used for effectively avoiding disturbance and influence of precipitation and excavation of the foundation pit with the rich water depth of the pebble layer on the immediately adjacent operation high-speed railway. And drilling fender piles which are filled with reinforced concrete are arranged at the far side of the sand pebble layer water-rich deep foundation pit at intervals in the longitudinal direction, engagement fender piles which are filled with reinforced concrete and engagement water stop piles which are filled with plain concrete are arranged at intervals in the longitudinal direction at the near side, and crown beams which are longitudinally pulled through along the sand pebble layer water-rich deep foundation pit are arranged at the tops of the drilling fender piles, the engagement fender piles and the engagement water stop piles. The horizontal limiting supports are arranged in a row along the depth direction and the longitudinal interval of the deep foundation pit rich in water of the sand-gravel layer, the shaft regulator and the steel enclosing purlin are arranged at the near end of the horizontal limiting supports which are arranged on the same side and the same row, the steel enclosing purlin is arranged at the far end, the steel enclosing purlins at the near end and the far end of the uppermost layer respectively act on the crown beams at the near side and the far side, the steel enclosing purlins at the near end of the other layers act on the occlusion enclosing pile and the occlusion water stopping pile, and the steel enclosing purlin at the far end acts on the drilling enclosing pile.
Description
Technical Field
The invention relates to a water-rich deep foundation pit enclosure structure adjacent to an operating high-speed rail pebble layer and a construction method thereof, which can be used in the fields of railway engineering, highway engineering, municipal engineering and the like, and is particularly suitable for the water-rich deep foundation pit engineering adjacent to the existing high-speed rail.
Background
With the development of urban construction, the deep foundation pit adjacent to the existing high-speed ballastless track is more and more, because the high-speed ballastless track is extremely sensitive to deformation, the ballastless track high-speed rail in operation is almost required to be in zero sedimentation, when the stratum is a sandy pebble layer with stronger water permeability, the groundwater level is often higher, and the excavation and precipitation of the conventional foundation pit can have different degrees of influence on the railway adjacent to the existing high-speed ballastless track, and even the operation safety of the high-speed rail can be endangered.
Aiming at the difficult reinforcement of the deep foundation pit, the invention not only can ensure the safety of the deep foundation pit, but also can ensure the operation safety of high-speed rails with the periphery adjacent to ballastless tracks, and simultaneously has the advantages of low engineering investment, low carbon and environmental protection, and has popularization.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the enclosure structure of the foundation pit with the water-rich deep in the immediately adjacent operation high-speed railway, so that the disturbance and influence of precipitation and excavation of the foundation pit with the water-rich deep in the sand-gravel layer on the immediately adjacent operation high-speed railway are effectively avoided.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention relates to a water-rich deep foundation pit support structure of a sand-gravel layer close to an operation high-speed railway embankment, which is characterized in that: the far side of the sand-gravel layer water-rich deep foundation pit is provided with drilling fender piles which are filled with reinforced concrete at intervals along the longitudinal direction, the near side of the sand-gravel layer water-rich deep foundation pit is provided with interlocking fender piles which are filled with reinforced concrete and interlocking water-stop piles which are filled with plain concrete at intervals along the longitudinal direction, the interlocking fender piles and the interlocking water-stop piles are alternately arranged and are in an interlocking shape, and the tops of the drilling fender piles, the interlocking fender piles and the interlocking water-stop piles are provided with crown beams which are longitudinally pulled through along the sand-gravel layer water-rich deep foundation pit; the deep foundation pit depth direction of rich water of sand gravel layer and vertical interval are arranged in a row and are provided with transverse limit struts, the same side and the same row of transverse limit struts are provided with a shaft regulator and a steel enclosing purlin at the near end, the steel enclosing purlin at the near end and the far end of the uppermost layer respectively acts on the crown beams at the near side and the far side, the steel enclosing purlin at the near end of the other layers acts on the occlusion fender pile and the occlusion water stop pile, the steel enclosing purlin at the far end acts on the drilling fender pile, and the shaft force of each transverse limit strut is regulated through the shaft regulator to limit the deformation of the deep foundation pit of rich water of sand gravel layer and the operation high-speed railway embankment.
The outer side of the far side of the sand-gravel layer water-rich deep foundation pit is provided with a filtering type water-lowering well at a longitudinal interval, a water level adjusting well is arranged between the near side and an operating high-speed railway embankment at a longitudinal interval, and a deformation measuring instrument is arranged outside the toe of the operating high-speed railway embankment.
The bottom of the sandy pebble layer water-rich deep foundation pit is sealed by a pit bottom water-resisting layer.
The invention provides a construction method for a water-rich deep foundation pit support structure close to an operating high-iron sand pebble layer, which comprises the following steps:
(1) a deformation measuring instrument is arranged outside the slope toe of the operating high-speed railway embankment to form a deformation observation system;
(2) positioning the occlusion fender pile and the occlusion water stop pile at the near side of the water-rich deep foundation pit of the sanded pebble layer, and pouring a crescent guide groove according to the positioning;
(3) after the crescent guide groove reaches the design strength, the whole sleeve pipe is adopted for pipe twisting and drilling, the occlusion water stop pile is constructed in a mode of punching and grabbing soil holes, a retarder is added during pouring, and smooth drilling can be ensured when the occlusion fender pile of the next working procedure is implemented;
(4) before pile body plain concrete of the occlusion water stop pile is initially set, constructing adjacent occlusion guard piles by adopting a full sleeve pipe rubbing drilling mode and a mode of punching and grabbing soil holes, and arranging a reinforcement cage, and reversely rubbing a lifting sleeve while pouring pile body concrete to ensure occlusion quality;
(5) alternately repeating the step (3) and the step (4) until the construction of the occlusion fender pile and the occlusion water stop pile is completed;
(6) chiseling pile heads of the occlusion guard piles and the occlusion water stop piles to form 0.5m floating paste, binding a reinforcement cage, and pouring proximal crown beam concrete;
(7) constructing a drilling fender pile on the far side at the same time of the construction step;
(8) constructing a filtering type dewatering well and a water level adjusting well, and starting dewatering operation on the far side;
(9) when the drilling fender piles, the occlusion fender piles and the occlusion water stop piles on the two sides all reach the design strength, the sand gravel layer water-rich deep foundation pit is dug in layers, and real-time deformation monitoring is carried out on the operation high-speed railway embankment and the sand gravel layer water-rich deep foundation pit;
when the sand-gravel layer water-rich deep foundation pit is excavated to a depth of 0.5m below the elevation of the first layer of transverse limiting support, the corresponding steel purlin and the corresponding shaft regulator are arranged, and prestress is applied to the transverse limiting support through the shaft regulator, so that the sand-gravel layer water-rich deep foundation pit is prevented from deforming to the inner side;
continuously digging downwards to a depth of 0.5m below the elevation of the second transverse limit support, and repeating the step (d) until the pit is dug to the bottom of the water-rich deep foundation pit of the sandy pebble layer;
and (3) injecting water-stop slurry into the bottom of the foundation pit to form a pit bottom water-resisting layer.
Aiming at the strict requirement of the operation high-speed rail on deformation, the invention combines the water-rich characteristic of the sand pebble layer, adopts a unilateral occlusion fender pile and an occlusion water stop pile to carry out enclosure, and effectively and accurately determines the pile position through a crescent guide groove and the pile position when the occlusion fender pile and the occlusion water stop pile are constructed, ensures the occlusion size, and furthest reduces the influence on the operation high-speed rail when drilling by the modes of full sleeve pipe rubbing, drilling and earth grabbing; the underground water level is controlled at any time by adopting a mode of combining a filtering type dewatering well with a water level regulating well, so that risks of instability, piping and the like in the process of excavating a foundation pit are reduced, and meanwhile, foundation settlement deformation caused by sudden drop of the water level of the high-iron-base bottom can be greatly reduced; the construction process is to observe the water level change condition of the operation high-speed rail side and the high-speed rail deformation condition at any time through the water level regulating well, and if abnormality is found, the deformation of the operation high-speed rail is controlled by recharging groundwater and increasing the transverse limit supporting axial force through the water level regulating well and the axial force regulator respectively, so that an informationized and dynamic construction method is formed.
Drawings
The specification includes four drawings as follows:
FIG. 1 is a cross-sectional view of a water-rich deep foundation pit enclosure of the present invention immediately adjacent to an operational high-iron sand pebble layer;
FIG. 2 is a plan view of the present invention immediately adjacent to a water-rich deep foundation pit enclosure operating a high-iron sand pebble layer;
FIG. 3 is a graph of the relationship between a shaft adjuster and a transverse limit bracing steel purlin of the present invention immediately adjacent to a water-rich deep foundation pit enclosure operating a high-iron sand pebble layer.
FIG. 4 is a construction diagram of a crescent guide slot for constructing a biting fender pile and a biting water stop pile in the construction method of the invention for operating a high-iron sand pebble layer water-rich deep foundation pit support structure.
The figure shows the components, part names and corresponding labels: the method comprises the following steps of operating a high-speed rail A, a sand pebble layer water-rich deep foundation pit B, a bored pile fender pile 1, a biting fender pile 2, a biting water stop pile 3, a crown beam 4, a transverse limiting support 5, a steel enclosing purlin 6, a shaft regulator 7, a filtering type dewatering well 8, a water level regulating well 9, a deformation observation point 10, a pit bottom sealing layer 11 and a crescent guide groove 12.
Description of the embodiments
The invention will be further described with reference to the drawings and examples.
Referring to fig. 1, 2 and 3, the invention is closely adjacent to a water-rich deep foundation pit enclosure structure of an operation high-speed railway embankment A, a sand-gravel layer water-rich deep foundation pit B is closely adjacent to an operation high-speed railway embankment A, drilling fender piles 1 which are filled with reinforced concrete are longitudinally arranged at intervals on the far side of the sand-gravel layer water-rich deep foundation pit B, occluding fender piles 2 which are filled with reinforced concrete and occluding water-stop piles 3 which are filled with plain concrete are longitudinally arranged at intervals on the near side of the sand-gravel layer water-rich deep foundation pit B, the occluding fender piles 2 and the occluding water-stop piles 3 are alternately arranged and are in an occluding shape, and crown beams 4 which are longitudinally pulled through along the sand-gravel layer water-rich deep foundation pit B are arranged at the tops of the drilling fender piles 1, the occluding fender piles 2 and the occluding water-stop piles 3; the deep foundation pit B with the sand and pebble layer is provided with transverse limiting supports 5 in rows along the depth direction and longitudinal intervals, the transverse limiting supports 5 on the same side and in the same row are provided with an axle regulator 6 and a steel enclosing purlin 7 at the near end, the steel enclosing purlins 7 at the near end and the far end of the uppermost layer are respectively acted on the crown beams 4 at the near side and the far side, the steel enclosing purlins 7 at the near end of the rest layers are acted on the occlusion fender pile 2 and the occlusion water stop pile 3, the steel enclosing purlins 7 at the far end are acted on the drilling fender pile 1, and the axle force of each transverse limiting support 5 is regulated through the axle regulator 6 to limit the deformation of the deep foundation pit B with the sand and pebble layer and the operation high-speed railway embankment A.
Referring to fig. 1 and 2, a filtering type dewatering well 8 is longitudinally arranged at intervals on the outer side of the far side of the sand-pebble layer water-rich deep foundation pit B, a water level adjusting well 9 is longitudinally arranged between the near side and the operating high-speed railway embankment A, and a deformation measuring instrument 10 is arranged outside the toe of the operating high-speed railway embankment A to form a deformation measuring system.
Referring to fig. 1 and 2, the bottom of the sandy pebble layer water-rich deep foundation pit B is closed by a pit bottom water-resisting layer 11, and the pit bottom water-resisting layer 11 can be formed by injecting water-stopping slurry into the bottom of the foundation pit. The steel purlin 7 is longitudinally pulled through along the sand-gravel layer water-rich deep foundation pit B, the transverse limiting support 5 can be made of steel pipes, and the shaft regulator 6 is usually a hydraulic jack.
Referring to fig. 1 and 2, the construction method of the water-rich deep foundation pit enclosure structure adjacent to the operation high-iron sand pebble layer of the invention comprises the following steps:
(1) a deformation measuring instrument 10 is arranged outside the slope toe of the operating high-speed railway embankment A to form a deformation observation system;
(2) positioning the occlusion fender pile 2 and the occlusion water stop pile 3 near the sanded pebble layer water-rich deep foundation pit B, and pouring a crescent guide groove 12 according to the positioning;
(3) after the crescent guide groove 12 reaches the design strength, the whole sleeve pipe is adopted for pipe twisting and drilling, the biting water stop pile 3 is constructed in a mode of punching and grabbing soil holes, retarder is added during pouring, and smooth drilling can be ensured when the biting fender pile 2 is implemented in the next working procedure;
(4) before the pile body plain concrete of the occlusion water stop pile 3 is initially set, constructing adjacent occlusion guard piles 2 by adopting a full sleeve pipe rubbing drilling mode and a mode of punching and grabbing soil holes, and arranging a reinforcement cage, and reversely rubbing and lifting sleeves while pouring pile body concrete to ensure occlusion quality;
(5) alternately repeating the step (3) and the step (4) until the construction of the occlusion fender pile 2 and the occlusion water stop pile 3 is completed;
(6) chiseling pile heads of the occlusion fender pile 2 and the occlusion water stop pile 3 to form 0.5m floating paste, binding a reinforcement cage, and pouring proximal crown beam 4 concrete;
(7) simultaneously with the construction step 6, constructing a drilling fender pile 1 on the far side;
(8) constructing a filtering type dewatering well 8 and a water level adjusting well 9, and starting dewatering operation on the far side;
(9) when the drilling fender piles 1, the occlusion fender piles 2 and the occlusion water stop piles 3 on the two sides reach the design strength, the sand and pebble layer water-rich deep foundation pit B is dug in layers, and real-time deformation monitoring is carried out on the operation high-speed railway embankment A and the sand and pebble layer water-rich deep foundation pit B;
when the sand-gravel layer water-rich deep foundation pit B is excavated to a depth of 0.5m below the elevation of the first layer of transverse limiting support 5, arranging the first layer of transverse limiting support 5, the corresponding steel enclosing purlin 7 and the shaft regulator 6) and applying prestress to the transverse limiting support 5 through the shaft regulator 6, so that the sand-gravel layer water-rich deep foundation pit B is prevented from deforming inwards;
continuously digging downwards to a depth of 0.5m below the 5 elevation of the second transverse limit support, and repeating the step (F) until the bottom of the foundation pit B with the sandy pebble layer and rich water is excavated;
is injected with water-stop slurry at the bottom of the foundation pit to form a pit bottom water-resisting layer 11.
Referring to fig. 4, the crescent guide groove 12 is formed by casting concrete, and is cast before the construction of the engagement fender post 2 and the engagement water stop post 3, and the crescent guide groove is strictly positioned before casting, so that the engagement size is ensured.
The foregoing is provided by way of illustration of the principles of the present invention in close proximity to a water-rich deep foundation pit enclosure for operating a high-iron sand pebble layer and method of construction thereof, and is not intended to limit the invention to the particular structure and steps shown and described, so that all such modifications and equivalents may be employed as are deemed to fall within the true scope of the invention.
Claims (6)
1. Adjacent operation high-speed railway embankment (A), characterized by is followed to rich water deep foundation ditch building of gravel layer, rich water deep foundation ditch (B) of gravel layer: the method comprises the steps that drilling fender piles (1) which are filled with reinforced concrete are arranged on the far side of a sand-pebble layer water-rich deep foundation pit (B) at intervals in the longitudinal direction, meshing fender piles (2) which are filled with reinforced concrete and meshing water-stop piles (3) which are filled with plain concrete are arranged on the near side of the sand-pebble layer water-rich deep foundation pit (B) at intervals in the longitudinal direction, the meshing fender piles (2) and the meshing water-stop piles (3) are alternately arranged and are meshed, and crown beams (4) which are longitudinally pulled through along the sand-pebble layer water-rich deep foundation pit (B) are arranged on the tops of the drilling fender piles (1), the meshing fender piles (2) and the meshing water-stop piles (3); the deep foundation pit (B) is provided with transverse limiting supports (5) in rows along the depth direction and longitudinal intervals of the sand-gravel layer, the transverse limiting supports (5) on the same side and in the same row are provided with an axle regulator (6) and steel enclosing purlins (7) at the near end, the steel enclosing purlins (7) at the near end and the far end of the uppermost layer are respectively acted on the crown beams (4) at the near side and the far side, the steel enclosing purlins (7) at the near end of the rest layers are acted on the occlusion fender pile (2) and the occlusion water stop pile (3), the steel enclosing purlins (7) at the far end are acted on the drilling fender pile (1), and the axle force of each transverse limiting support (5) is regulated through the axle regulator (6) to limit the deformation of the sand-gravel layer deep foundation pit (B) and the operation high-speed railway embankment (A).
2. The water-rich deep foundation pit enclosure immediately adjacent to an operational high-iron sand pebble layer of claim 1, wherein: the sand-gravel layer water-rich deep foundation pit (B) is characterized in that a filtering type dewatering well (8) is arranged at a longitudinal interval outside the far side, a water level adjusting well (9) is arranged between the near side and an operating high-speed railway embankment (A) at a longitudinal interval, and a deformation measuring instrument (10) is arranged outside the slope toe of the operating high-speed railway embankment (A).
3. The water-rich deep foundation pit enclosure immediately adjacent to an operational high-iron sand pebble layer of claim 1, wherein: the bottom of the sandy pebble layer water-rich deep foundation pit (B) is sealed by a pit bottom water-resisting layer (11).
4. The water-rich deep foundation pit enclosure immediately adjacent to an operational high-iron sand pebble layer of claim 1, wherein: the steel purlin (7) is longitudinally pulled through along the sand pebble layer water-rich deep foundation pit (B).
5. The water-rich deep foundation pit enclosure immediately adjacent to an operational high-iron sand pebble layer of claim 1, wherein: the transverse limiting support (5) is made of steel pipes, and the shaft regulator (6) is a hydraulic jack.
6. The construction method of the water-rich deep foundation pit enclosure structure adjacent to the operational high-iron sand pebble layer according to any one of claims 1 to 5, comprising the following steps:
(1) a deformation measuring instrument (10) is arranged outside the slope toe of the operating high-speed railway embankment (A) to form a deformation observation system;
(2) positioning the occlusion guard pile (2) and the occlusion water stop pile (3) near the sandy pebble layer water-rich deep foundation pit (B), and pouring a crescent guide groove (12) according to the positioning;
(3) after the crescent guide groove (12) reaches the design strength, constructing the occlusion water stop pile (3) by adopting a full sleeve pipe rubbing drilling mode and a soil grabbing pore-forming mode, adding a retarder during pouring, and ensuring that the occlusion fender pile (2) in the next working procedure can smoothly drill when being implemented;
(4) before pile body plain concrete of the occlusion water stop pile (3) is initially set, constructing adjacent occlusion guard piles (2) by adopting a full sleeve pipe rubbing drilling mode and a mode of punching grabbing soil to form holes, and reversely rubbing and lifting sleeves while pouring pile body concrete to ensure occlusion quality;
(5) alternately repeating the step (3) and the step (4) until the construction of the occlusion fender pile (2) and the occlusion water stop pile (3) is completed;
(6) chiseling pile heads of the occlusion fender pile (2) and the occlusion water stop pile (3) to form 0.5m floating paste, binding a reinforcement cage, and pouring the concrete of the crown beam (4) at the near side;
(7) simultaneously with the construction step (6), constructing a drilling fender pile (1) on the far side;
(8) constructing a filtering type dewatering well (8) and a water level adjusting well (9), and starting dewatering operation on the far side;
(9) when the drilling fender piles (1), the occlusion fender piles (2) and the occlusion water stop piles (3) on two sides all reach the design strength, the sand-gravel layer water-rich deep foundation pit (B) is dug in layers, and real-time deformation monitoring is carried out on the operating high-speed railway embankment (A) and the sand-gravel layer water-rich deep foundation pit (B);
when the sand-gravel layer water-rich deep foundation pit (B) is excavated to a depth of 0.5m below the elevation of the first layer of transverse limiting support (5), arranging the first layer of transverse limiting support (5) and corresponding steel enclosing purlin (7) and a shaft regulator (6), and applying prestress to the transverse limiting support (5) through the shaft regulator (6) to ensure that the sand-gravel layer water-rich deep foundation pit (B) is not deformed inwards;
continuously digging downwards to a depth of 0.5m below the elevation of the second transverse limit support (5), and repeating the step (I) until the bottom of the sandy pebble layer water-rich deep foundation pit (B) is excavated;
is injected with water-stop slurry at the bottom of the foundation pit to form a pit bottom water-resisting layer (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811566729.XA CN109518698B (en) | 2018-12-20 | 2018-12-20 | Water-rich deep foundation pit support structure close to operating high-iron sand pebble layer and construction method thereof |
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| CN201811566729.XA CN109518698B (en) | 2018-12-20 | 2018-12-20 | Water-rich deep foundation pit support structure close to operating high-iron sand pebble layer and construction method thereof |
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| CN109518698A CN109518698A (en) | 2019-03-26 |
| CN109518698B true CN109518698B (en) | 2023-11-17 |
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| CN110397092B (en) * | 2019-05-14 | 2021-09-17 | 洛阳市轨道交通有限责任公司 | Sand and pebble foundation pit displacement prediction method |
| CN110761301A (en) * | 2019-11-08 | 2020-02-07 | 向怀轶 | Protection structure close to existing high-speed rail pebble layer water-rich deep foundation pit |
| CN111005388A (en) * | 2019-12-12 | 2020-04-14 | 中冶天工集团有限公司 | Deep foundation pit integral supporting device and supporting method thereof |
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