CN114837195A - Construction method for supporting foundation pit of deep mud layer of high slope - Google Patents
Construction method for supporting foundation pit of deep mud layer of high slope Download PDFInfo
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- CN114837195A CN114837195A CN202210554436.XA CN202210554436A CN114837195A CN 114837195 A CN114837195 A CN 114837195A CN 202210554436 A CN202210554436 A CN 202210554436A CN 114837195 A CN114837195 A CN 114837195A
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- 238000010276 construction Methods 0.000 title claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 239000010802 sludge Substances 0.000 claims abstract description 9
- 239000002689 soil Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000005192 partition Methods 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 abstract description 3
- 230000002787 reinforcement Effects 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
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
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- 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
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- 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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Foundations (AREA)
Abstract
The invention discloses a construction method for supporting a foundation pit with a high slope and a deep mud layer, which relates to the technical field of bridge construction, and comprises the steps of constructing steel sheet piles, constructing jet grouting piles, installing purlins, inner supports, concrete cushions and the like, wherein a combined supporting system of steel sheet piles and soil body reinforcement is directly adopted, can effectively solve a series of problems in the construction of bearing platforms of high slopes and deep sludge layers, such as the damage of the flood control embankment caused by the graded unloading, the influence of unbalanced load on the foundation pit supporting structure and the excavation of the foundation pit on the stability of the flood control embankment and the like, and can remarkably accelerate the construction period and reduce the resource investment, the technical scheme of the foundation pit support of the invention has wide representativeness, the method can ensure the smooth implementation of basic engineering similar to bridges, ensure the life and property safety of people, save social cost, have great economic value and have wide engineering prospect.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a construction method for a high slope deep mud layer foundation pit support.
Background
Along with the continuous input of the country to the infrastructure, river-crossing and river-crossing bridge engineering is more and more, and the environmental factors such as the navigation ability of the original river channel, the water resource protection, flood control and scouring resistance are also more emphasized to be maintained, so that the bridge bearing platform is generally deeply buried in the side slope of the river channel and is close to an embankment, and the foundation pit is in the unfavorable position of the high side slope.
Disclosure of Invention
The invention aims to provide a high slope deep mud layer foundation pit supporting construction method to overcome the defects caused in the prior art.
A construction method for supporting a high-slope deep sludge layer foundation pit comprises the following steps:
(1) leveling the field to +7.000m, driving steel sheet piles, and inserting and driving the steel sheet piles firstly to ensure that the steel sheet piles are smoothly inserted and driven and avoid disturbance to the rotary jet piles;
(2) constructing a foundation pit and reinforcing an internal and external high-pressure rotary spraying pile, wherein the bottom of the internal and external high-pressure rotary spraying pile of the foundation pit is required to be embedded into a fourth powdery clay layer, the depth is not less than 1m, pure cement slurry is adopted, the water-cement ratio is 1.0, the spraying pressure is not less than 20MPa, the nozzle movement speed is 0.1-0.2 m/min, and the pile diameter is 700 mm;
(3) excavating and draining water in the foundation pit to a position (elevation +5.600m) 1.0m below the first-layer inner support, and installing an enclosing purlin and the inner support;
(4) continuously excavating to +2.350m (strictly preventing overbreak) at the bottom of the back cover in the foundation pit, and pouring a concrete cushion layer of 10-20 cm;
(5) after the concrete cushion layer reaches the design strength, chiseling off a pile head, a support die, binding reinforcing steel bars and pouring a bearing platform in sequence;
(6) after the concrete of the bearing platform reaches the design strength, backfilling the soil to the elevation of the top of the bearing platform, and removing the counter brace;
(7) completing pier body construction;
(8) and backfilling soil, and pulling out the steel sheet piles and the inclined struts to finish construction.
The invention also discloses an enclosing purlin used for the construction process, which specifically comprises a plurality of steel beams connected end to end, wherein the steel beams are supported at the inner sides of the steel sheet piles by means of brackets arranged on the steel sheet piles, the upper ends of the steel beams are provided with drainage grooves, a plurality of partition plates are further arranged in the drainage grooves and divide the drainage grooves into a plurality of drainage areas, the partition plates are provided with communication holes, a plurality of baffle plates for personnel to move are paved on the partition plates, the baffle plates are provided with drainage pipes, and the drainage pipes are connected to a water suction pump through hoses.
Preferably, the height of the upper end of the partition plate is lower than that of the upper end of the steel beam.
Preferably, slide rail (7) are still installed to the inboard of girder steel (1), and sliding connection has slide (8) that are used for installing the water pump on slide rail (7).
Preferably, the baffle is provided with a plurality of elongated drain holes.
The invention has the advantages that:
1. the method directly adopts a combined supporting system of steel sheet piles and soil body reinforcement, can effectively solve a series of problems existing in the construction of high slope and deep sludge layer bearing platforms, such as the damage of graded unloading to the flood control levee, the influence of unbalanced load on a foundation pit supporting structure and foundation pit excavation on the stability of the flood control levee, and the like, and can remarkably accelerate the construction period and reduce the resource investment.
2. In the construction of the bridge bearing platform, similar side slopes have more foundation pits, so the foundation pit supporting technical scheme has wide representativeness, can ensure the smooth implementation of similar bridge foundation engineering, ensures the life and property safety of people, saves social cost, has huge economic value and has wide engineering prospect.
3. The invention further optimizes and improves the existing enclosing purlin structure, designs the drainage groove, can drain accumulated water falling on the steel beam into the drainage groove by virtue of the water suction pipe, and then drains the accumulated water to other places by virtue of the water suction pump, and the arrangement of the baffle plate can also facilitate constructors to walk back and forth on the enclosing purlin so as to be beneficial to construction. In addition, the setting of filter screen can also be filtered the ponding of taking out in the foundation ditch, reduces the probability that water drainage tank produced the jam.
Drawings
FIG. 1 is a schematic view of the structure of a steel beam according to the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a sectional view taken along a-a in fig. 2.
Fig. 4 is a schematic structural diagram of another embodiment of the present invention.
Wherein: 1 girder steel, 2 water drainage tank, 3 baffles, 4 intercommunicating pores, 5 baffles, 50 wash ports, 6 drain pipes, 7 slide rails, 8 slides.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The invention discloses a construction method for supporting a high slope deep mud layer foundation pit, which comprises the following steps:
(1) leveling the field to +7.000m, driving steel sheet piles, and inserting and driving the steel sheet piles firstly to ensure that the steel sheet piles are smoothly inserted and driven and avoid disturbance to the rotary jet piles;
(2) constructing a foundation pit and reinforcing an internal and external high-pressure rotary spraying pile, wherein the bottom of the internal and external high-pressure rotary spraying pile of the foundation pit is required to be embedded into a fourth powdery clay layer, the depth is not less than 1m, pure cement slurry is adopted, the water-cement ratio is 1.0, the spraying pressure is not less than 20MPa, the nozzle movement speed is 0.1-0.2 m/min, and the pile diameter is 700 mm;
(3) excavating and draining water in the foundation pit to a position (elevation +5.600m) 1.0m below the first-layer inner support, and installing an enclosing purlin and the inner support;
(4) continuously excavating to +2.350m (strictly preventing overbreak) at the bottom of the back cover in the foundation pit, and pouring a 15cm concrete cushion;
(5) after the concrete cushion layer reaches the designed strength, chiseling off a pile head, a support die, binding reinforcing steel bars and pouring a bearing platform in sequence;
(6) after the concrete of the bearing platform reaches the design strength, backfilling the soil to the elevation of the top of the bearing platform, and removing the counter brace;
(7) completing pier body construction;
(8) and backfilling soil, and pulling out the steel sheet piles and the inclined struts to finish construction.
As shown in fig. 1 to fig. 3, this embodiment also discloses an enclosing purlin for the above-mentioned work progress, specifically include a plurality of end to end's girder steel 1, girder steel 1 supports in the inboard of steel sheet pile with the help of installing the bracket on the steel sheet pile, the upper end of girder steel 1 is equipped with water drainage tank 2, can be filled with sealing rubber or jelly at the seam crossing of steel sheet pile and girder steel 1 and seal, in order to guarantee that the rainwater can directly flow into water drainage tank 2, still be equipped with a plurality of baffles 3 in the water drainage tank 2 and separate water drainage tank 2 into a plurality of water drainage district, be equipped with intercommunicating pore 4 on the baffle 3, baffle 3 upper berth is equipped with a plurality of baffles 5 that are used for personnel's activity, be equipped with drain pipe 6 on the baffle 5, drain pipe 6 is connected to the suction pump through the hose.
In this embodiment, the height of the upper end of the partition board 3 is lower than that of the upper end of the steel beam 1, and the baffle 5 is provided with a plurality of strip-shaped drain holes 50, so that rainwater can enter the drain groove 2 conveniently.
As shown in fig. 4, in order to facilitate discharge of accumulated water in the foundation pit, the inner side of the steel beam 1 is further provided with a slide rail 7, the slide rail 7 is connected with a slide seat 8 for installing a water pump in a sliding manner, the water pump can be moved to a proper position for pumping water according to needs by means of the slide seat 8, a fixed type base for installing the water pump does not need to be arranged outside the foundation pit or on the steel beam 1, and operation is convenient.
The method directly adopts a combined supporting system of steel sheet piles and soil body reinforcement, can effectively solve a series of problems existing in the construction of high slope and deep sludge layer bearing platforms, such as the damage of graded unloading to the flood control levee, the influence of unbalanced load on a foundation pit supporting structure and foundation pit excavation on the stability of the flood control levee, and the like, and can remarkably accelerate the construction period and reduce the resource investment.
In the construction of the bridge bearing platform, similar side slopes have more foundation pits, so the foundation pit supporting technical scheme has wide representativeness, can ensure the smooth implementation of similar bridge foundation engineering, ensures the life and property safety of people, saves social cost, has huge economic value and has wide engineering prospect.
The invention further optimizes and improves the existing enclosing purlin structure, the drainage groove 2 is designed, accumulated water falling on the steel beam 1 can be drained into the drainage groove 2 by the aid of the water pumping pipe 7, the accumulated water is drained to other places by the water pumping pump, and the baffle 5 can also facilitate constructors to walk on the enclosing purlin back and forth, so that construction is facilitated.
It will be appreciated by those skilled in the art that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (7)
1. The construction method for the foundation pit support of the deep and thick silt layer of the high slope is characterized by comprising the following steps:
(1) leveling the field to +7.000m, and driving steel sheet piles;
(2) reinforcing the high-pressure jet grouting piles inside and outside the construction foundation pit;
(3) excavating and draining water in the foundation pit to a position 1.0m below the first-layer inner support, mounting the enclosing purlin and the inner support, wherein the inner support is detachably connected to the inner side of the enclosing purlin and is used for providing a support in the horizontal direction for the enclosing purlin;
(4) continuously excavating the foundation pit to +2.350m of the bottom of the back cover, and pouring a concrete cushion layer with the thickness of 10-20cm for water insulation;
(5) after the concrete cushion layer reaches the design strength, chiseling off a pile head, a support die, binding reinforcing steel bars and pouring a bearing platform in sequence;
(6) after the concrete of the bearing platform reaches the design strength, backfilling the soil to the elevation of the top of the bearing platform, and removing the counter brace;
(7) completing pier body construction;
(8) and backfilling soil, and pulling out the steel sheet piles and the inclined struts to finish construction.
2. The method for supporting and constructing a foundation pit of a deep mud layer on a high slope according to claim 1, wherein in the step (2), the fourth powdery clay layer is required to be arranged at the bottom of the high-pressure rotary-spraying piles inside and outside the foundation pit, the depth of the fourth powdery clay layer is not less than 1m, the slurry adopts pure cement slurry, the water-cement ratio is 1.0, the spraying pressure is not less than 20MPa, the nozzle movement speed is 0.1-0.2 m/min, and the pile diameter is 700 mm.
3. The construction method for supporting and protecting the foundation pit of the deep and thick sludge layer of the high slope according to claim 2, wherein the thickness of the concrete cushion layer in the step (4) is 15 cm.
4. The construction method for supporting and protecting the foundation pit of the deep sludge layer on the high slope according to claim 1, wherein the purlin surrounding in the step (3) comprises a plurality of steel beams (1) which are connected end to end, the steel beams (1) are supported on the inner side of the steel sheet pile by means of brackets mounted on the steel sheet pile, the upper end of the steel beams (1) is provided with a drainage groove (2), a plurality of partition plates (3) are further arranged in the drainage groove (2) and divide the drainage groove (2) into a plurality of drainage areas, communication holes (4) are formed in the partition plates (3), a plurality of baffle plates (5) used for personnel to move are paved on the partition plates (3), drain pipes (6) are arranged on the baffle plates (5), and the drain pipes (6) are connected to a water suction pump through hoses.
5. The high slope deep sludge layer foundation pit supporting construction method according to claim 4, characterized in that the height of the upper end of the partition plate (3) is lower than that of the upper end of the steel beam (1).
6. The construction method for supporting the foundation pit of the deep sludge layer on the high slope according to claim 4, wherein a slide rail (7) is further installed on the inner side of the steel beam (1), and a slide seat (8) for installing a water pump is connected on the slide rail (7) in a sliding manner.
7. The method for supporting and constructing a foundation pit of a deep and thick sludge layer of a high slope according to claim 4, wherein the baffle plate (5) is provided with a plurality of elongated drain holes (50).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210554436.XA CN114837195A (en) | 2022-05-20 | 2022-05-20 | Construction method for supporting foundation pit of deep mud layer of high slope |
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| CN202210554436.XA CN114837195A (en) | 2022-05-20 | 2022-05-20 | Construction method for supporting foundation pit of deep mud layer of high slope |
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