CN113914328B - Combined type multilayer Larsen steel sheet pile combined supporting structure and construction method thereof - Google Patents
Combined type multilayer Larsen steel sheet pile combined supporting structure and construction method thereof Download PDFInfo
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- CN113914328B CN113914328B CN202111353133.3A CN202111353133A CN113914328B CN 113914328 B CN113914328 B CN 113914328B CN 202111353133 A CN202111353133 A CN 202111353133A CN 113914328 B CN113914328 B CN 113914328B
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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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
- E02D17/18—Making embankments, e.g. dikes, dams
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
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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
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
Abstract
The invention discloses a combined type multilayer Larsen steel sheet pile combined supporting structure which comprises a supporting structure in the backfilling process of a foundation pit bottom layer, a supporting structure in the backfilling process of a foundation pit middle layer and a supporting structure in the backfilling process of a foundation pit top layer, wherein the supporting structure in the backfilling process of the foundation pit bottom layer comprises a concrete block arranged in the center of the interior of a foundation pit, a first steel sheet pile is arranged on the inner wall of the foundation pit middle layer, a second steel sheet pile is arranged on the inner wall of the foundation pit bottom layer, a first transmission plate belt is arranged between the bottom of the concrete block and the bottom of the second steel sheet pile, and a first backfilling layer is arranged in a space between the concrete block and the second steel sheet pile. And earth backfilling is symmetrically carried out in a layered mode along with the progress of the main body, and the support is gradually detached, replaced, backfilled and pulled out from bottom to top. The integral construction tissue is compactly connected, reasonably and orderly, the expected purpose and good effect are achieved, and the Larsen steel sheet pile is effectively put into the deep foundation pit supporting work.
Description
Technical Field
The invention belongs to the technical field of foundation pit supporting, and particularly relates to a combined type multilayer Larsen steel sheet pile combined supporting structure and a construction method thereof.
Background
The Larsen steel sheet pile is one kind of steel sheet pile, and is generally suitable for projects such as shallow foundation pits, pipeline grooves, cofferdams, short-term temporary supports and the like. Compared with other supporting modes, the Larsen steel sheet pile has the incomparable advantages of convenience and rapidness in construction, environment-friendly and energy-saving material turnover and the like. However, due to the characteristics of stability, supporting force, plasticity, toughness and the like of steel materials of the steel sheet pile support, the Larsen steel sheet pile support is often used with great care in dangerous engineering such as deep foundation pits and the like due to safety considerations. At present, most of researches on a Larsen steel sheet pile supporting system are single-row Larsen steel sheet pile supporting systems, the multistage Larsen steel sheet pile supporting system is not effectively put into practice, and a combined type multilayer Larsen steel sheet pile combined supporting structure suitable for a deep foundation pit and a construction method are provided aiming at the advantages of Larsen steel sheet piles.
Disclosure of Invention
The invention aims to provide a combined type multilayer Larsen steel sheet pile combined supporting structure and a construction method thereof, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a combined type multi-layer Larsen steel sheet pile combined supporting structure comprises a supporting structure in the backfilling process of the bottom layer of a foundation pit, a supporting structure in the backfilling process of the middle layer of the foundation pit and a supporting structure in the backfilling process of the top layer of the foundation pit, wherein,
the supporting structure in the backfilling process of the foundation pit bottom layer comprises a concrete block arranged at the center inside the foundation pit, a first steel plate pile is arranged on the inner wall of the middle layer of the foundation pit, a second steel plate pile is arranged on the inner wall of the foundation pit, a first force transmission plate strip is arranged between the bottom of the concrete block and the bottom of the second steel plate pile, a first backfilling layer is arranged in a space between the concrete block and the second steel plate pile, a first temporary support is arranged in the concrete block, a second force transmission plate strip is arranged on the first backfilling layer and is positioned in a space between the concrete block and the second steel plate pile, a third force transmission plate strip is arranged between the first steel plate pile and the second steel plate pile and covers the bottom of the middle layer of the foundation pit, a first inner support is arranged at the upper part inside the second steel plate pile, and a second inner support is arranged at the upper part inside the first steel plate pile;
the supporting structure in the foundation pit middle layer backfilling process comprises a second backfill layer arranged between the concrete grid baffle and the first steel plate pile, the second backfill layer is positioned above a second force transmission plate strip and a third force transmission plate strip, a fourth force transmission plate strip is arranged above the second backfill layer, and the fourth force transmission plate strip is positioned between the first steel plate pile and the concrete grid baffle;
the supporting structure in the backfilling process of the top layer of the foundation pit comprises a third backfill layer arranged between the concrete block and the inner wall of the top layer of the foundation pit, and the third backfill layer is positioned above the fourth force transmission plate strip and the bottom of the top layer of the foundation pit.
The construction of the composite multilayer Larsen steel sheet pile comprises the following steps:
the method comprises the following steps: opening a multi-layer foundation pit and erecting a steel sheet pile;
step two: backfilling and support changing of the bottom layer of the foundation pit;
step three: backfilling and replacing a support in the middle layer of the foundation pit;
step four: and backfilling and dismantling the support at the top layer of the foundation pit.
Preferably, the thickness of the first force transfer plate strip is at least 10 cm, the thickness of the second force transfer plate strip is at least 5 cm, the thickness of the third force transfer plate strip is at least 8 cm, and the thickness of the fourth force transfer plate strip is at least 5 cm.
Preferably, in the first step, the position of a foundation pit to be excavated is measured and positioned, the positions of a first steel sheet pile and a second steel sheet pile are measured and placed, a deep groove of 2m is formed along the periphery of the foundation pit, a crawler-type hydraulic excavator with a hydraulic vibration hammer machine is used for driving the first steel sheet pile, a precipitation well and pre-precipitation are constructed after the first steel sheet pile is constructed, meanwhile, a slope is placed to excavate the foundation pit to 2.9m below the ground surface, the trench is selected to excavate the earthwork of the second steel sheet pile to 5.0m below the ground surface, a crawler-type hydraulic excavator with a hydraulic vibration hammer machine is used for driving the second steel sheet pile, a steel purlin and a bracket of the first steel sheet pile are constructed after the construction, a second inner support is installed in the first steel sheet pile, the purlin and the bracket are constructed to 5.9m below the ground surface, a steel purlin and a first inner support are installed in the second steel sheet pile, the excavation continues to the bottom of the pit, and the foundation pit is poured with a concrete block.
Preferably, in the first step, when the first steel sheet pile and the second steel sheet pile are driven, a screen type driving method is adopted to ensure that the steel sheet piles are vertically positioned and mutually engaged.
Preferably, in the second step, after the concrete block is completely solidified, a first force transmission plate strip is additionally arranged between the bottom of the concrete block and the bottom of the second steel plate pile, after the addition is finished, slag soil is filled in a space between the second steel plate pile and the concrete block and is tamped to form a first backfill layer, a second force transmission plate strip is additionally arranged on the first backfill layer, the second force transmission plate strip is supported at the top of the second steel plate pile and the top of the staged concrete block, a third force transmission plate strip is additionally arranged between the first steel plate pile and the second steel plate pile and is located at the bottom of the middle layer of the foundation pit, a first temporary support is arranged on the upper side of the inner wall of the concrete block, and finally the first inner support is removed.
Preferably, in the third step, the concrete grid is heightened, after the heightened area is completely solidified, the first temporary support is installed on the inner wall of the heightened position of the concrete grid, the second steel sheet pile is pulled out, the second inner support is removed, after removal, slag soil is filled between the concrete grid and the first steel sheet pile and tamped to form a second backfill layer, a fourth force transmission plate strip is additionally arranged on the second backfill layer, and the fourth force transmission plate strip is positioned between the first steel sheet pile and the concrete grid.
Preferably, in the fourth step, the concrete block is continuously heightened and poured, after the heightened position is completely solidified, the first temporary supports at the upper part and the lower part are removed, then the first steel sheet pile is pulled out, after the first steel sheet pile is pulled out, a slag soil layer is filled in a space between the outer wall of the heightened part of the concrete block and the top layer of the foundation pit, and a third backfill layer is formed after the concrete block is tamped.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a combined multi-layer Larsen steel sheet pile combined supporting structure, which is characterized in that steps are arranged in a limited foundation pit layer by layer step by step to ensure that the deep foundation pit is gradually deepened in a step shape, the side pressure of a soil body is gradually reduced in step shape, the soil body is respectively supported step by step according to the deformation rule of an extrapit stratum and a building structure caused by excavation, a third force transmission plate strip is arranged between two stages of first steel sheet piles and second steel sheet piles, and a first force transmission plate strip, a second force transmission plate strip and a fourth force transmission plate strip are arranged between a concrete grid and each steel sheet pile to ensure that the whole supporting system is integrated and balanced in stress, thereby ensuring that the distortion and deformation of a supporting pile are in a controllable range and the self safety of the foundation pit.
The invention relates to a construction method of a combined type multilayer Larsen steel sheet pile combined supporting structure, which can keep continuous precipitation during the construction of main engineering, and performs foundation pit protection, open water drainage and foundation pit monitoring work, wherein earthwork backfilling is performed in a layered and symmetrical mode along with the progress of a main body, and supporting replacement, backfilling and pile pulling are performed step by step from bottom to top. The integral construction organization is compact, connected, reasonable and ordered, the expected purpose and good effect are achieved, and the Larsen steel sheet pile is effectively put into the deep foundation pit supporting work.
Drawings
FIG. 1 is a schematic view of an excavation section of a foundation pit according to the present invention;
FIG. 2 is a schematic view of a backfill section of the bottom layer of the foundation pit according to the present invention;
FIG. 3 is a schematic diagram of a middle-layer backfill section of a foundation pit according to the present invention;
fig. 4 is a schematic diagram of a backfill section of the top layer of the foundation pit.
In the figure: the concrete frame comprises 1 concrete block, 2 first steel sheet pile, 3 second steel sheet pile, 4 first force transmission plate strip, 5 first backfill layer, 6 first temporary support, 7 second force transmission plate strip, 8 third force transmission plate strip, 9 first inner support, 10 second inner support, 11 second backfill layer, 12 fourth force transmission plate strip and 13 third backfill layer.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Fig. 1, 2, 3 and 4, a combined type multilayer Larsen steel sheet pile combined supporting structure comprises a supporting structure in the backfilling process of the bottom layer of a foundation pit, a supporting structure in the backfilling process of the middle layer of the foundation pit and a supporting structure in the backfilling process of the top layer of the foundation pit, wherein,
the supporting structure in the foundation pit bottom backfilling process comprises a concrete block 1 arranged at the center of the interior of a foundation pit, a first steel sheet pile 2 is arranged on the inner wall of a middle layer of the foundation pit, a second steel sheet pile 3 is arranged on the inner wall of the bottom layer of the foundation pit, the first steel sheet pile 2 and the second steel sheet pile 2 both adopt SP-IV type Larsen steel sheet piles supported by two steel beams, the foundation pit water stopping scheme is that pile bodies are meshed to automatically cut off water, the problems of foundation pit water seepage, quicksand and the like are basically avoided due to the fact that the mouth type steel sheet piles of the Larsen steel sheet piles have the self-stopping function, a first transmission plate belt 4 is placed between the bottom of the concrete block 1 and the bottom of the second steel sheet pile 3, the thickness of the first transmission plate belt 4 is 10 cm, the first transmission plate belt 4 is made of manganese steel, a first backfilling layer 5 is filled in a space between the concrete block 1 and the second steel sheet pile 3, and the first backfilling layer 5 is formed by compacting of slag, a first temporary support 6 is installed in the concrete block 1, a second force transmission plate strip 7 is placed on the first backfill layer 5, the second force transmission plate strip 7 is located in a space between the concrete block 1 and a second steel plate pile 3, the thickness of the second force transmission plate strip 7 is 5 cm, the second force transmission plate strip 7 is manganese steel, a third force transmission plate strip 8 is placed between the first steel plate pile 2 and the second steel plate pile 3, the third force transmission plate strip 8 covers the bottom of the middle layer of the foundation pit, the thickness of the third force transmission plate strip 8 is 8 cm, the third force transmission plate strip 8 is manganese steel, a first inner support 9 is installed at the upper portion of the second steel plate pile 3, the first inner support 9 can support the top of the second steel plate pile 3, a second inner support 10 is arranged at the upper portion of the first steel plate pile 2, and the second inner support 10 can support the top of the first steel plate pile 2;
the supporting structure in the process of backfilling the middle layer of the foundation pit comprises a second backfill layer 11 filled between a concrete grid baffle 1 and a first steel plate pile 2, wherein the second backfill layer 11 is positioned on a second force transmission plate strip 7 and a third force transmission plate strip 8, a fourth force transmission plate strip 12 is arranged on the second backfill layer 11 and is positioned between the first steel plate pile 2 and the concrete grid baffle 1, the thickness of the fourth force transmission plate strip 12 is 5 cm, the third force transmission plate strip 8 is arranged between the two first steel plate piles 2 and the second steel plate pile 3, and the first force transmission plate strip 4, the second force transmission plate strip 7 and the fourth force transmission plate strip 12 are arranged between the concrete structure and the steel plate piles, so that the whole supporting system is integrated, the stress is balanced, the steel plate piles are ensured to be distorted and deformed within a controllable range, and the self safety of the foundation pit is ensured;
the supporting structure in the foundation pit top layer backfilling process comprises a third backfilling layer 13 filled between the concrete barrier 1 and the inner wall of the foundation pit top layer, and the third backfilling layer 13 is located on the fourth force transmission plate strip 12 and the bottom of the foundation pit top layer.
The steps are arranged in the limited site of the foundation pit layer by layer step by step, so that the deep foundation pit is gradually deepened in a step shape, the side pressure of the soil body is gradually reduced step by step, and the support capability is respectively provided step by step according to the deformation rule of the stratum outside the pit and the building structure caused by excavation.
The construction of the composite multilayer Larsen steel sheet pile comprises the following steps:
the method comprises the following steps: the method comprises the steps of firstly, after the ground is cleaned, measuring and positioning the positions of a foundation pit to be excavated, measuring and releasing the positions of a first steel sheet pile 2 and a second steel sheet pile 3, arranging the first steel sheet pile 2 and the second steel sheet pile 3 at an interval of 3 meters, arranging 3 shallow precipitation wells between the first steel sheet pile 2 and the second steel sheet pile 3, arranging an observation well outside the foundation pit, paving a 4@250 bidirectional reinforcing mesh around the top layer of the foundation pit, pouring 50mm thick C15 fine stone concrete, picking 2m deep grooves along the periphery of the foundation pit, adopting a crawler-type hydraulic excavator with a VH-2000 hydraulic vibration hammer to beat the first steel sheet pile 2, constructing the precipitation well and pre-precipitating after the first steel sheet pile 2 is constructed, simultaneously putting a slope to excavate the foundation pit to 2.9m below the ground surface, picking up the position of the second steel sheet pile 3 to excavate 5.0m below the ground surface, driving a second steel sheet pile 3 by adopting a crawler-type KATO-1250 hydraulic excavator with a VH-2000 hydraulic vibratory hammer, constructing a steel purlin and a bracket of a first steel sheet pile 2 after the construction is finished, installing a second inner support 10 in the first steel sheet pile 2, excavating to 5.9m below the ground surface, constructing a steel purlin and a bracket of a second steel sheet pile 3, wherein the steel purlin adopts a size model of H400, installing a first inner support 9 in the second steel sheet pile 3, adopting a steel support with a size model of phi 630 and adopting a shield wind type driving method to ensure that the steel sheet piles are vertically positioned and mutually engaged when the first steel sheet pile 2 and the second steel sheet pile 3 are driven;
the foundation pit earthwork excavation adopts two CT260 excavators to cooperate with one 24m lengthened wall excavator to cooperate with supporting and supporting layered operation, the transport vehicle is forbidden to stop on site along with excavation, the enclosing purlin and bracket supporting construction is immediately organized when the transport vehicle is excavated to the elevation position, and the foundation pit bottom earthwork is excavated and carried by manually cooperating with a crane bucket.
Step two: backfilling and replacing a support at the bottom of a foundation pit, in the second step, after the concrete block 1 is completely solidified, firstly, additionally arranging a first force transmission plate strip 4 between the bottom of the concrete block 1 and the bottom of a second steel plate pile 3, after the additionally arrangement is finished, filling slag in a space between the second steel plate pile 3 and the concrete block 1, tamping to form a first backfilling layer 5, then additionally arranging a second force transmission plate strip 7 on the first backfilling layer 5, supporting the second force transmission plate strip 7 at the top of the second steel plate pile 3 and the top of the staged concrete block 1, additionally arranging a third force transmission plate strip 8 between the first steel plate pile 2 and the second steel plate pile 3, positioning the third force transmission plate strip 8 at the bottom of the middle layer of the foundation pit, then arranging a first temporary support 6 on the upper side of the inner wall of the concrete block 1, and finally removing a first inner support 9;
step three: and (3) backfilling and replacing a support at the middle layer of the foundation pit, heightening and pouring the concrete block 1 in the third step, completely solidifying the heightened area, mounting a first temporary support 6 on the inner wall of the heightened part of the concrete block 1, removing the second steel sheet pile 3, removing the second inner support 10, filling slag between the concrete block 1 and the first steel sheet pile 2 after removal, tamping to form a second backfill layer 11, adding a fourth force transmission plate strip 12 on the second backfill layer 11, and positioning the fourth force transmission plate strip 12 between the first steel sheet pile 2 and the concrete block 1.
Step four: and backfilling and dismantling the support at the top layer of the foundation pit, continuously heightening and pouring the concrete block 1 in the fourth step, dismantling the upper and lower first temporary supports 6 after the heightened position is completely solidified, then removing the first steel sheet pile 2, filling a slag layer into a space between the outer wall of the heightened part of the concrete block 1 and the top layer of the foundation pit after the first steel sheet pile is removed, and tamping to form a third backfill layer 13.
And (3) keeping continuous precipitation during the construction of the main body engineering, performing foundation pit protection, open water precipitation drainage and foundation pit monitoring work, performing muck backfilling symmetrically along with the main body progress in a layering manner, and gradually detaching the support, replacing the support, backfilling and pulling the pile according to a design scheme from bottom to top.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (6)
1. The utility model provides a combined type multilayer Larsen steel sheet pile combined supporting structure which characterized in that: comprises a supporting structure in the backfilling process of the bottom layer of a foundation pit, a supporting structure in the backfilling process of the middle layer of the foundation pit and a supporting structure in the backfilling process of the top layer of the foundation pit, wherein,
the supporting structure in the backfilling process of the foundation pit bottom layer comprises a concrete lattice baffle (1) arranged in the center of the interior of the foundation pit, a first steel plate pile (2) is arranged on the inner wall of the foundation pit middle layer, a second steel plate pile (3) is arranged on the inner wall of the foundation pit bottom layer, a first force transmission plate strip (4) is arranged between the bottom of the concrete lattice baffle (1) and the bottom of the second steel plate pile (3), a first backfilling layer (5) is arranged in a space between the concrete lattice baffle (1) and the second steel plate pile (3), a first temporary support (6) is arranged in the concrete lattice baffle (1), a second force transmission plate strip (7) is arranged on the first backfilling layer (5), the second force transmission plate strip (7) is located in a space between the concrete lattice baffle (1) and the second steel plate pile (3), a third force transmission plate strip (8) is arranged between the first steel plate pile (2) and the second steel plate pile (3), the third force transmission plate strip (8) covers the bottom of the foundation pit, a first steel plate pile (9) is arranged on the upper portion of the inner support steel plate pile (2), and a second steel plate pile (10) is arranged on the inner support;
the supporting structure in the middle-layer backfilling process of the foundation pit comprises a second backfill layer (11) arranged between the concrete lattice barrier (1) and the first steel plate pile (2), the second backfill layer (11) is positioned above a second force transmission plate strip (7) and a third force transmission plate strip (8), a fourth force transmission plate strip (12) is arranged above the second backfill layer (11), and the fourth force transmission plate strip (12) is positioned between the first steel plate pile (2) and the concrete lattice barrier (1);
the supporting structure in the foundation pit top layer backfilling process comprises a third backfill layer (13) arranged between the concrete block (1) and the inner wall of the foundation pit top layer, and the third backfill layer (13) is positioned on the fourth force transmission plate strip (12) and the bottom of the foundation pit top layer;
the construction of the composite multilayer Larsen steel sheet pile comprises the following steps:
the method comprises the following steps: opening a multi-layer foundation pit and erecting a steel sheet pile;
step two: backfilling and support changing of the bottom layer of the foundation pit;
step three: backfilling and replacing a support in the middle layer of the foundation pit;
step four: and backfilling and dismantling the support at the top layer of the foundation pit, continuously heightening and pouring the concrete block (1), dismantling the first temporary supports (6) at the upper part and the lower part after the heightened position is completely solidified, then removing the first steel sheet piles (2), filling a slag layer into a space between the outer wall of the heightened part of the concrete block (1) and the top layer of the foundation pit after the first steel sheet piles are removed, and forming a third backfill layer (13) after tamping.
2. The composite multilayer Larsen steel sheet pile combined supporting structure according to claim 1, characterized in that: the thickness of the first force transmission plate strip (4) is at least 10 cm, the thickness of the second force transmission plate strip (7) is at least 5 cm, the thickness of the third force transmission plate strip (8) is at least 8 cm, and the thickness of the fourth force transmission plate strip (12) is at least 5 cm.
3. The composite multilayer Larsen steel sheet pile combined supporting structure according to claim 1, characterized in that: in the first step, measuring and positioning are carried out aiming at the position to be excavated of the foundation pit, the positions of a first steel sheet pile (2) and a second steel sheet pile (3) are measured and placed, a deep groove of 2m is formed along the periphery of the foundation pit, a crawler-type hydraulic excavator is adopted to drive the first steel sheet pile (2) with a hydraulic hammer shaker, a precipitation well and a pre-precipitation are constructed after the first steel sheet pile (2) is constructed, meanwhile, a slope is placed to excavate the foundation pit to 2.9m below the ground surface, a ditch is selected to excavate the second steel sheet pile (3) to the position 5.0m below the ground surface, the crawler-type hydraulic excavator is adopted to drive the second steel sheet pile (3) with the hydraulic hammer shaker, a steel purlin and a bracket are constructed after the construction of the first steel sheet pile (2), a second inner support (10) is installed in the first steel sheet pile (2), the excavation is carried out to 5.9m below the ground surface, the steel sheet pile and the steel purlin and the bracket are constructed, a first inner support (9) is installed in the second steel sheet pile (3), and then, a concrete pit bottom layer is excavated, and a concrete pit bottom layer is poured.
4. The composite multilayer Larsen steel sheet pile combined supporting structure according to claim 3, characterized in that: in the first step, when the first steel sheet pile (2) and the second steel sheet pile (3) are driven, a screen type driving method is adopted to ensure that the steel sheet piles are vertically positioned and mutually engaged.
5. The composite multilayer Larsen steel sheet pile combined supporting structure according to claim 1, characterized in that: in the second step, after the concrete block (1) is completely solidified, firstly, a first force transmission plate strip (4) is additionally arranged between the bottom of the concrete block (1) and the bottom of a second steel plate pile (3), after the addition is finished, slag is filled in a space between the second steel plate pile (3) and the concrete block (1) and is tamped to form a first backfill layer (5), then, a second force transmission plate strip (7) is additionally arranged on the first backfill layer (5), the second force transmission plate strip (7) is supported at the top of the second steel plate pile (3) and the top of the staged concrete block (1), then, a third force transmission plate strip (8) is additionally arranged between the first steel plate pile (2) and the second steel plate pile (3), the third force transmission plate strip (8) is located at the middle bottom of a foundation pit, then, a first temporary support (6) is arranged on the upper side of the inner wall of the concrete block (1), and finally, a first inner support (9) is removed.
6. The composite multilayer Larsen steel sheet pile combined supporting structure according to claim 1, characterized in that: in the third step, the concrete block (1) is heightened and poured, the area to be heightened is completely solidified, the first temporary support (6) is installed on the inner wall of the heightening position of the concrete block (1), the second steel sheet pile (3) is pulled out, then the second inner support (10) is removed, after removal, slag soil is filled between the concrete block (1) and the first steel sheet pile (2), a second backfill layer (11) is formed by tamping, a fourth force transmission plate belt (12) is additionally installed on the second backfill layer (11), and the fourth force transmission plate belt (12) is located between the first steel sheet pile (2) and the concrete block (1).
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207062958U (en) * | 2017-07-13 | 2018-03-02 | 江苏华轩建设工程有限公司 | A kind of deep basal pit complexity some support combining structure |
| CN109610487A (en) * | 2018-11-30 | 2019-04-12 | 福建建中建设科技股份有限公司 | A kind of Larsen steel sheet-pile cofferdam and its construction method |
| CN111608186A (en) * | 2020-04-14 | 2020-09-01 | 中国建筑第二工程局有限公司 | Construction method for inner support of pit-in-pit section steel of super high-rise pit |
| CN111794256A (en) * | 2020-08-10 | 2020-10-20 | 中国建筑第八工程局有限公司 | Construction method of underwater pile cap in river flood discharge area |
| CN112112166A (en) * | 2020-08-25 | 2020-12-22 | 中建八局第二建设有限公司 | Self-balancing support construction method for Larsen steel sheet pile under complex geological condition through squeezing silt |
-
2021
- 2021-11-16 CN CN202111353133.3A patent/CN113914328B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207062958U (en) * | 2017-07-13 | 2018-03-02 | 江苏华轩建设工程有限公司 | A kind of deep basal pit complexity some support combining structure |
| CN109610487A (en) * | 2018-11-30 | 2019-04-12 | 福建建中建设科技股份有限公司 | A kind of Larsen steel sheet-pile cofferdam and its construction method |
| CN111608186A (en) * | 2020-04-14 | 2020-09-01 | 中国建筑第二工程局有限公司 | Construction method for inner support of pit-in-pit section steel of super high-rise pit |
| CN111794256A (en) * | 2020-08-10 | 2020-10-20 | 中国建筑第八工程局有限公司 | Construction method of underwater pile cap in river flood discharge area |
| CN112112166A (en) * | 2020-08-25 | 2020-12-22 | 中建八局第二建设有限公司 | Self-balancing support construction method for Larsen steel sheet pile under complex geological condition through squeezing silt |
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