CN112227385A - Anchor cable and recyclable steel pile combined foundation pit supporting structure and construction method thereof - Google Patents
Anchor cable and recyclable steel pile combined foundation pit supporting structure and construction method thereof Download PDFInfo
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- CN112227385A CN112227385A CN202011184573.6A CN202011184573A CN112227385A CN 112227385 A CN112227385 A CN 112227385A CN 202011184573 A CN202011184573 A CN 202011184573A CN 112227385 A CN112227385 A CN 112227385A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 255
- 239000010959 steel Substances 0.000 title claims abstract description 255
- 238000010276 construction Methods 0.000 title claims abstract description 27
- 239000002689 soil Substances 0.000 claims abstract description 42
- 239000004568 cement Substances 0.000 claims abstract description 29
- 238000009412 basement excavation Methods 0.000 claims abstract description 26
- 238000004873 anchoring Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 16
- 239000011148 porous material Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 230000002262 irrigation Effects 0.000 claims description 3
- 238000003973 irrigation Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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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
- E02D5/54—Piles with prefabricated supports or anchoring parts; Anchoring piles
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention belongs to a foundation pit supporting structure combining anchor cables and recyclable steel piles in foundation pit supporting engineering and a construction method thereof, and the technical scheme is as follows: a foundation pit supporting structure combining an anchor cable and a recyclable steel pile is disclosed, wherein one side of a cement soil mixing pile is a foundation pit excavation area, and a section steel pile, a steel sheet pile, a steel beam, an inclined steel cable, the anchor cable and a jet grouting pile are arranged in the cement soil mixing pile; the steel sheet pile is positioned on the side far away from the excavation side of the foundation pit; the steel beam is connected with the section steel pile and the steel sheet pile, and the rotary spraying pile is positioned at the lower part of the steel sheet pile; the inclined steel cable winds around the pile body of the steel sheet pile downwards and is clamped at the position of the pile body, and two ends of the inclined steel cable are anchored with the outer side of the top of the section steel pile upwards; and an anchor rope is arranged in the steel sheet pile, the top of the anchor rope is anchored with the top of the steel sheet pile, and the bottom of the anchor rope is anchored with an anchoring device arranged in the jet grouting pile. Wherein steel in the foundation pit supporting structure can be completely recycled and reused.
Description
Technical Field
The technology belongs to the technical field of civil engineering, is particularly used in foundation pit supporting engineering, and particularly relates to a foundation pit supporting structure combining anchor cables and recyclable steel piles and a construction method.
Background
In the process of foundation pit engineering construction, a foundation pit supporting retaining wall is generally needed to be adopted as a temporary support to ensure that foundation pit excavation construction is smoothly carried out, a foundation pit supporting structure has the functions of vertical stability, micro deformation, water stop and the like, and for the foundation pit engineering of a first-layer to second-layer underground structure in a soft soil area, the conventional foundation pit supporting method has the forms of a cement soil gravity type retaining wall, a profile steel cement soil stirring wall, a cast-in-place pile row pile, a double-row pile and the like. The existing schemes have the following defects: 1. the cement soil gravity type enclosure wall has poor integrity, is only suitable for shallow foundation pits, has larger deformation and is easy to collapse; 2. the profile steel cement soil mixing wall is formed by inserting profile steel into a cement soil mixing pile, wherein the profile steel can be recycled, and a pit inner support or an oblique anchor cable is generally required to be arranged in a foundation pit excavation area in a matched mode; 3. the cast-in-place pile has higher pile arranging cost, all materials can not be recycled, and the cast-in-place pile becomes an underground obstacle after construction is finished and is generally required to be provided with an in-pit support or an oblique anchor cable; 4. the underground structure construction efficiency is influenced by the in-pit support system, and most projects are difficult to implement due to the fact that the oblique anchor cable exceeds a red line of land; 5. a row of piles and a cross beam are added to the double-row pile supporting structure to form a portal structure, so that the cost is high, the horizontal rigidity is improved limitedly, and the deformation resistance is weak. Due to the reasons, the comprehensive cost of the foundation pit supporting engineering is high, the material waste is serious, and the energy conservation and the environmental protection are not facilitated.
Disclosure of Invention
In order to solve the technical problems, the invention provides a foundation pit supporting structure combining anchor cables and recyclable steel piles and a construction method thereof, wherein steel in the foundation pit supporting structure can be completely recycled and reused.
The technical scheme of the invention is as follows: a foundation pit supporting structure combining an anchor cable and a recyclable steel pile is characterized in that one side of a cement soil mixing pile is a foundation pit excavation area, and a section steel pile, a steel sheet pile, a steel beam, an inclined steel cable, the anchor cable and a jet grouting pile are arranged in the cement soil mixing pile; the steel sheet pile is positioned on the side far away from the excavation side of the foundation pit; the steel beam is connected with the section steel pile and the steel sheet pile, and the rotary spraying pile is positioned at the lower part of the steel sheet pile; the inclined steel cable winds around the pile body of the steel sheet pile downwards and is clamped at the position of the pile body, and two ends of the inclined steel cable are anchored with the outer side of the top of the section steel pile upwards; and an anchor rope is arranged in the steel sheet pile, the top of the anchor rope is anchored with the top of the steel sheet pile, and the bottom of the anchor rope is anchored with an anchoring device arranged in the jet grouting pile.
Based on the technical characteristics: welding an anchorage device bracket on the side surface of the top of the section steel pile; the steel sheet pile comprises a steel sheet pile body, a first steel sheet and a second steel sheet, wherein the side face of the pile body of the steel sheet pile is welded with the first steel sheet, the outer side of the first steel sheet is welded with the second steel sheet, the bottom elevation of the second steel sheet is lower than that of the first steel sheet, a notch is formed between the first steel sheet and the second steel sheet, an oblique steel cable bypasses the notch, a first anchorage device is arranged at the top tensioning end of the oblique steel cable, and the first anchorage.
Based on the technical characteristics: the width of the anchorage device bracket is larger than the width of the flange of the section steel pile, and a pore passage through which the inclined steel cable passes is reserved in an end part area beyond the width range of the section steel pile, so that the inclined steel cable bypasses from two sides of the section steel pile.
Based on the technical characteristics: the contact surface of the steel sheet pile and the inclined steel cable is arc-shaped.
Based on the technical characteristics: and a second anchorage device is arranged at the tensioning end of the top of the anchor cable, the second anchorage device is fixed on a top plate of the steel sheet pile, and a base plate is arranged between the second anchorage device and the top plate.
Based on the technical characteristics: the top side surfaces of the section steel piles and the steel sheet piles are connected with the steel beams through bolts.
The construction method comprises the following steps:
the method comprises the following steps: the steel section piles, the steel plate piles and the steel beams are connected into a whole by bolts, the inclined steel cable downwards bypasses a notch formed by a first steel plate and a second steel plate of the steel plate piles, two ends of the inclined steel cable are respectively anchored on the anchor bracket by utilizing a first anchor, and the inclined steel cable is tensioned on the basis of straightening;
step two: constructing a cement soil mixing pile, and inserting the structure formed by combining the steps into a liquid pile body after the cement soil mixing pile is followed;
step three: after the cement soil mixing pile reaches specific strength, drilling holes in the steel sheet pile to construct anchor cables, anchoring devices and jet grouting piles; after the jet grouting pile reaches the design strength, mounting a base plate and a second anchor at the top of the steel sheet pile, and tensioning and anchoring the upper end of the anchor cable to the second anchor;
step four: further stretching the inclined steel cable to reach a designed stretching force, and anchoring the inclined steel cable by using a first anchorage device;
step five: excavating a soil body of an excavation area of the foundation pit, and constructing a basement structure;
step six: after the construction of the basement structure is completed and the foundation pit is backfilled, loosening the first anchorage device and drawing out the inclined steel cables one by one; loosening the second anchorage device, and removing the backing plate; when the anchoring device adopts a recyclable device, the recyclable anchor cable is drawn out;
step seven: and dismantling bolts for connecting the section steel piles, the steel sheet piles and the steel beams, recycling the steel beams, respectively pulling out the section steel piles and the steel sheet piles, filling the pulled-out pore channels in a slurry irrigation mode, and completing foundation pit construction.
Based on the technical characteristics: step 4 and step 5 are replaced by: excavating a soil body of an excavation area of the foundation pit, and constructing a basement structure; and gradually increasing the tensile force of the inclined steel cable for many times in the soil body excavation process of the foundation pit excavation area to achieve the design tensile force, and anchoring the inclined steel cable by using a first anchorage device.
In the technical scheme, the cement-soil mixing pile is the prior mature technology, the cable truss is adopted, the cement-soil mixing pile belongs to a stressed secondary structure, the main function is used as waterproof curtain water stop, resistance is reduced when the section steel pile and the steel plate pile are conveniently inserted into soil, and the section steel is conveniently inserted after soil and cement paste are mixed into paste during construction.
The structure and the construction method can realize the complete recovery of steel in the foundation pit supporting structure, form a cable-stayed supporting structure on the premise that the anchor cable does not exceed the ground red line, fully play the high-strength advantage of the steel strand as a tension member and reduce the consumption of the steel in the foundation pit supporting engineering; meanwhile, the tension of the inclined steel cable can be gradually increased for many times in the excavation process of the foundation pit, the deformation of the foundation pit supporting structure can be synchronously controlled, and the safety of foundation pit engineering and the surrounding environment is ensured.
The beneficial effects of the invention include: 1. high-value steel in the foundation pit supporting structure can be recycled; 2. an in-pit support system can be omitted, the construction cost is reduced, and the construction convenience is improved; 3. the anchor cables arranged on the jet grouting piles are vertically arranged, so that the anchor cables do not exceed the range of land utilization red lines, are not influenced by the range of land utilization, and are convenient to implement; 4. the tension of the inclined steel cable can be increased for many times in the excavation process of the foundation pit, the deformation of the foundation pit supporting structure is synchronously controlled, and the safety of foundation pit engineering and the surrounding environment is ensured.
Drawings
Fig. 1 is an overall installation view of the present invention.
Fig. 2 is a detailed diagram of node a.
FIG. 3 is a J-J cross-sectional view of the A node.
Fig. 4 is a detailed diagram of a node B.
Fig. 5 is a K-K cross-section of a node B.
Fig. 6 is a detailed view of a node C.
FIG. 7 is a cross-sectional view taken along line L-L of node C.
FIG. 8 is a cross-sectional view of the M-M section of the C node.
Reference numbers in the figures: 1 is the shaped steel stake, 11 is the ground tackle bracket, 2 is the steel sheet pile, 21 is the roof, 22 is the side connecting plate, 23 is first steel sheet, 24 is the second steel sheet, 3 is the girder steel, 31 is first end plate, 32 is the second end plate, 4 is oblique cable wire, 41 is first ground tackle, 5 is the anchor rope, 51 is the second ground tackle, 52 is the backing plate, 53 is anchoring device, 6 is the jet grouting stake, 7 is soil cement mixing pile.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The invention is further described below by way of examples.
As shown in fig. 1, one side of the soil cement mixing pile 7 is a foundation pit excavation area. The cement soil mixing pile 7 comprises a section steel pile 1, a steel sheet pile 2, a steel beam 3, an inclined steel cable 4, an anchor cable 5 and a jet grouting pile 6; the section steel pile 1 is close to the excavation side of the foundation pit, and the steel plate pile 2 is positioned at the side far away from the excavation side of the foundation pit; the steel beam 3 is connected with the section steel pile 1 and the steel sheet pile 2, and the jet grouting pile 6 is positioned at the lower part of the steel sheet pile 2; the inclined steel cable 4 winds around the pile body of the steel sheet pile 2 downwards and is clamped at the position of the pile body, and two ends of the inclined steel cable are anchored with the outer side of the top of the section steel pile 1 upwards; an anchor rope 5 is arranged in the steel sheet pile 2, the top of the anchor rope 5 is anchored with the top of the steel sheet pile 2, and the bottom of the anchor rope 5 is anchored with an anchoring device 53 arranged in the jet grouting pile 6.
The section steel pile 1 is hot-rolled H-shaped steel with the length of 15 m; as shown in fig. 5, the steel sheet pile 2 is a 12mm thick steel sheet pile with a semicircular arc section, in which case the contact surface between the oblique steel cables 4 and the pile body of the steel sheet pile 2 can be made into a circular arc shape, which facilitates the arrangement of the oblique steel cables 4 around the steel sheet pile. The length of the steel sheet pile 2 is 12 m. As shown in fig. 2 to 5, the steel beam 3 is hot rolled H-section steel having a length of 3 m. The first end plate 31 and the second end plate 32 are respectively welded at two ends of the steel beam 3. The first end plate 31 and the second end plate 32 are both made of 16mm thick steel plates. The first end plate 31 is used for connecting the section steel pile 1 through bolts; the second end plate 32 is used for bolting the steel sheet pile 2.
As shown in fig. 2 and 3, an anchor bracket 11 is welded on the side surface of the top of the section steel pile 1, the anchor bracket 11 is a triangular pipe formed by bending or splicing and welding steel plates, and the thickness of each steel plate is 16 mm; the width of the anchorage device bracket 11 is 500mm, and a hole is reserved for the inclined steel cable 4 at the end part area beyond the width range of the flange of the section steel pile 1. The inclined steel cable 4 is a seven-core steel strand with the diameter of 15.24mm, the number of the inclined steel cable is determined according to foundation pit support calculation, a first anchorage device 41 is arranged at the top tensioning end, the first anchorage device 41 is sleeved by a rectangular clamping piece type anchorage device, the first anchorage device 41 is fixed on the anchorage device bracket 11, the inclined steel cable 4 is wound around from two sides of the section steel pile 1, penetrates through a hole of the anchorage device bracket 11 and is anchored by the first anchorage device 41.
As shown in fig. 4 and 5, a top plate 21 is welded on the top of the steel sheet pile 2, the top plate 21 is a steel plate with the thickness of 20mm, and anchor cable construction holes with the diameter of 150mm are formed in the plate; side connecting plate 22 is welded to the side of steel sheet pile 2 top, and side connecting plate 22 is 16mm steel sheet, reserves the bolt hole for be connected with the second end plate 32 of girder steel 3.
As shown in fig. 6, 7 and 8, a first steel plate 23 is welded to the outer side of the arc of the steel sheet pile 2, a second steel plate 24 is welded to the outer side of the first steel plate 23, the bottom elevation of the second steel plate 24 is lower than that of the first steel plate 23, a notch opening downwards is formed, and the first steel plate 23 and the second steel plate 24 are arc-shaped steel plates with the thickness of 16 mm. The skew cables 4 are passed down around the notches formed by the first steel plate 23 and the second steel plate 24 of the steel sheet pile 2.
As shown in fig. 4 and 5, the anchor cable 5 is a seven-core steel strand with a diameter of 15.24mm, the number of the seven-core steel strand is determined according to foundation pit support calculation, a backing plate 52 and a second anchor 51 are arranged at the top tensioning end, the second anchor 51 is a circular clip type anchor set, the backing plate 52 is a steel plate with the thickness of 20mm and the diameter of 200mm, the steel plate covers the hole of the top plate 21, and a hole is reserved in the steel plate for the anchor cable. As shown in fig. 1, the bottom end of the anchor cable 5 is provided with an anchoring device 53 in the jet grouting pile 6, if the anchoring device 53 is a finished recyclable anchoring device, the anchor cable 5 can be recycled.
The jet grouting pile 6 can adopt a high-pressure jet grouting pile with the pile diameter of 400-800, wherein the pile diameter of the end part is 800mm, and the pile diameter of the middle part is 400 mm.
The cement soil mixing pile 7 can adopt a phi 700@500 double-shaft cement soil mixing pile with the pile length of 15 m; the combined structure of the section steel pile 1, the steel plate pile 2, the steel beam 3 and the inclined steel cable 4 is integrally inserted into the cement soil mixing pile 7 after the cement soil mixing pile 7 is constructed.
All the parts can be connected and disassembled by welding and bolts; referring to fig. 1 to 8, those skilled in the art of construction and installation can easily implement the method.
An embodiment of the construction method of the present invention is described as follows:
the method comprises the following steps: adopt bolted connection to be whole between shaped steel pile 1, steel sheet pile 2, the girder steel 3, oblique cable wire 4 is down around the notch that first steel sheet 23, second steel sheet 24 formed on steel sheet pile 2, and both ends utilize first ground tackle 41 anchor respectively on anchorage device bracket 11, and oblique cable wire 4 stretch-draw is with straightening as the standard.
Step two: and constructing a cement soil mixing pile 7, and inserting the structure formed by combining the steps into a liquid pile body after the cement soil mixing pile 7.
Step three: after cement mixing pile 7 reaches specific strength, anchor rope 5, anchor 53, jet grouting pile 6 are under construction at the inside scope drilling of steel sheet pile 2, and concrete construction mode is: drilling, lowering the anchoring device 53, the anchor cable 5 and a jet pipe of a rotary spraying machine, wherein the jet pipe is arranged in the center and sprays high-pressure slurry from bottom to top, and the anchoring device 53 and the anchor cable 5 are left in the center of the rotary spraying pile after the pile is formed. The process herein belongs to the state of the art. And after the jet grouting pile 6 reaches the design strength, installing a base plate 52 and a second anchor 51 at the top of the steel sheet pile 2, and tensioning and anchoring the anchor cable 5.
Step four: further tensioning the inclined steel cable 4 to reach a designed tensioning force, anchoring the inclined steel cable 4 by using the first anchorage device 41, and gradually increasing the tensioning force of the inclined steel cable 4 for multiple times in the excavation process of the soil body F in the excavation area of the foundation pit to synchronously control the deformation of the foundation pit supporting structure.
Step five: excavating a soil body F of an excavation area of the foundation pit, and constructing a basement structure; in the figure 1, the top surfaces of the soil body F and the cement soil mixing piles 7 in the excavation area of the foundation pit on the bottom E of the foundation pit are flush with the ground surface G outside the pit.
Step six: after the construction of the underground structure is completed and the foundation pit is backfilled, the first anchorage device 41 is loosened, and the inclined steel cables 4 are drawn out one by one; and (3) loosening the second anchorage device 51, removing the backing plate 52, and recovering the anchor cable 5 when the recoverable jet grouting anchorage device is adopted as the anchoring device 53. Generally, in the prior art, two types of anchors for the jet grouting anchor cable are provided, wherein one type of anchor is conventional and can not be recycled, namely the anchor cable is not drawn out after the engineering is finished, and the anchor cable and the anchor are all left in the soil; after the construction of another recoverable anchor cable is finished, the anchor cable can be drawn out and recovered, and the anchor devices in the two modes are remained in the jet grouting pile body.
Step seven: and (3) dismantling the connecting bolts among the section steel piles 1, the steel sheet piles 2 and the steel beams 3, recovering the steel beams 3, respectively pulling out the section steel piles 1 and the steel sheet piles 2, filling the pulled-out pore channels in a slurry irrigation mode, and completing foundation pit construction.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides an anchor rope and foundation ditch supporting construction of recoverable piling bar combination which characterized in that: one side of the cement soil mixing pile (7) is a foundation pit excavation area, and a section steel pile (1), a steel plate pile (2), a steel beam (3), an inclined steel cable (4), an anchor cable (5) and a jet grouting pile (6) are arranged in the cement soil mixing pile (7); the section steel pile (1) is positioned at the side close to the excavation of the foundation pit, and the steel plate pile (2) is positioned at the side far away from the excavation of the foundation pit; the steel beam (3) is connected with the section steel pile (1) and the steel sheet pile (2), and the jet grouting pile (6) is positioned at the lower part of the steel sheet pile (2); the inclined steel cable (4) downwards bypasses the pile body of the steel plate pile (2) and is clamped at the position of the pile body, and two ends of the inclined steel cable are upwards anchored with the outer side of the top of the section steel pile (1); an anchor rope (5) is arranged in the steel sheet pile (2), the top of the anchor rope (5) is anchored with the top of the steel sheet pile (2), and the bottom of the anchor rope (5) is anchored with an anchoring device (53) arranged in the jet grouting pile (6).
2. The anchor rope and recoverable steel pile combined foundation pit supporting structure of claim 1, wherein: an anchorage device bracket (11) is welded on the side face of the top of the section steel pile (1); the first steel sheet of pile body side welding (23) of steel sheet pile (2), first steel sheet (23) outside welding second steel sheet (24), the end elevation of second steel sheet (24) is less than the end elevation of first steel sheet (23), first steel sheet (23) with form the notch between second steel sheet (24), cable rope (4) is walked around to one side the notch, cable rope (4) top stretch-draw end sets up first ground tackle (41) to one side, first ground tackle (41) are fixed on anchorage device bracket (11).
3. The anchor rope and recoverable steel pile combined foundation pit supporting structure of claim 2, wherein: the width of the anchorage device bracket (11) is larger than the width of a flange of the section steel pile (1), and a pore passage through which the inclined steel cable passes is reserved in an end part area beyond the width range of the section steel pile (1), so that the inclined steel cable (4) bypasses from two sides of the section steel pile (1).
4. An anchor cable and recoverable steel pile combined foundation pit supporting structure according to claim 1 or 2, wherein: the contact surface of the steel sheet pile (2) and the inclined steel cable (4) is arc-shaped.
5. The anchor rope and recoverable steel pile combined foundation pit supporting structure of claim 1, wherein: and a second anchorage device (51) is arranged at the top tensioning end of the anchor cable (5), the second anchorage device (51) is fixed on the top plate (21) of the steel sheet pile (2), and a base plate (52) is arranged between the second anchorage device (51) and the top plate (21).
6. The anchor rope and recoverable steel pile combined foundation pit supporting structure of claim 1, wherein: the steel section pile is characterized in that the top side faces of the steel sheet pile (2) and the steel beam (3) are connected through bolts.
7. The method for constructing a foundation pit supporting structure by combining anchor cables and recyclable steel piles according to claim 2, wherein the method comprises the following steps:
the method comprises the following steps: the section steel pile (1), the steel sheet pile (2) and the steel beam (3) are connected into a whole by bolts, the inclined steel cable (4) downwardly bypasses the notches formed by the first steel plate (23) and the second steel plate (24) of the steel sheet pile (2), two ends of the inclined steel cable are respectively anchored on the anchor bracket (11) by using the first anchor (41), and the inclined steel cable (4) is tensioned based on straightening;
step two: constructing the cement soil mixing pile (7), and inserting the structure combined in the step one into a liquid pile body after the cement soil mixing pile (7);
step three: after the cement soil mixing pile (7) reaches a specific strength, drilling holes in the inner range of the steel sheet pile (2) to construct the anchor cable (5), the anchoring device (53) and the jet grouting pile (6); after the jet grouting pile (6) reaches the design strength, installing a base plate (52) and a second anchor (51) at the top of the steel sheet pile (2), and tensioning and anchoring the upper end of the anchor cable (5) to the second anchor (51);
step four: further tensioning the oblique steel cable (4) to reach a design tensioning force, and anchoring the oblique steel cable (4) by using the first anchorage device (41);
step five: excavating a soil body (F) in an excavation area of the foundation pit, and constructing a basement structure;
step six: after the construction of the basement structure is completed and a foundation pit is backfilled, loosening the first anchorage devices (41) and drawing out the inclined steel cables (4) one by one; loosening the second anchorage (51) and removing the backing plate (52); when the anchoring device (53) adopts a recoverable device, the anchor cable (5) is extracted and recovered;
step seven: and dismantling the bolts for connecting the section steel piles (1), the steel plate piles (2) and the steel beams (3), recovering the steel beams (3), respectively pulling out the section steel piles (1) and the steel plate piles (2), filling the pulled-out pore channels by adopting a slurry irrigation mode, and finishing foundation pit construction.
8. The method of constructing an anchor cable and recoverable steel pile combined foundation pit supporting structure according to claim 7, wherein the method comprises the following steps: the step 4 and the step 5 are replaced by: excavating a soil body (F) in an excavation area of the foundation pit, and constructing a basement structure; and gradually increasing the tensile force of the inclined steel cable (4) for many times in the excavation process of the soil body (F) in the excavation area of the foundation pit to achieve the design tensile force, and anchoring the inclined steel cable (4) by using the first anchorage device (41).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112962617A (en) * | 2021-02-06 | 2021-06-15 | 中冶成都勘察研究总院有限公司 | Comprehensive pipe gallery foundation pit supporting method for weathered rock stratum area |
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Application publication date: 20210115 |