CN111119198A - A reinforced structure that is used for SMW worker method stake to strut system - Google Patents

A reinforced structure that is used for SMW worker method stake to strut system Download PDF

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Publication number
CN111119198A
CN111119198A CN202010041507.7A CN202010041507A CN111119198A CN 111119198 A CN111119198 A CN 111119198A CN 202010041507 A CN202010041507 A CN 202010041507A CN 111119198 A CN111119198 A CN 111119198A
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CN
China
Prior art keywords
pile
smw
steel
construction
support
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Pending
Application number
CN202010041507.7A
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Chinese (zh)
Inventor
宗朝阳
潘传宇
黄兴昌
周小亮
陈鹏
田玉婷
戴韵秋
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China State Railway Investment Construction Group Co Ltd
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China State Railway Investment Construction Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by China State Railway Investment Construction Group Co Ltd filed Critical China State Railway Investment Construction Group Co Ltd
Priority to CN202010041507.7A priority Critical patent/CN111119198A/en
Publication of CN111119198A publication Critical patent/CN111119198A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits

Abstract

The invention discloses a reinforcing structure for a pile supporting system of an SMW construction method, which comprises the pile supporting system of the SMW construction method, an anchor cable on the outer side of a foundation pit and a cast support on the inner side of the foundation pit, wherein the pile supporting system of the SMW construction method comprises an SMW construction method pile, a crown beam and a foundation pit inner side three-axis stirring pile foundation bottom reinforcement, the anchor cable on the outer side of the foundation pit is a steel sheet pile with two ends respectively anchored on the outer side of the foundation pit and a prestressed steel strand on the construction steel of the pile supporting system of the SMW construction method, and the cast support on the inner side of the foundation pit is a steel pipe support with two ends respectively supporting a pouring bottom plate and the crown beam of the pile supporting system of the SMW construction method.

Description

A reinforced structure that is used for SMW worker method stake to strut system
Technical Field
The invention belongs to the technical field of reinforcement of building engineering foundation pit support structures, and particularly relates to a reinforced structure for a pile support system based on an SMW construction method, which is suitable for supporting and reinforcing construction of a foundation pit in a weak stratum.
Background
Along with the development of urbanization, the surrounding environment of an engineering construction site is more and more complex, the disturbance is inevitably generated to the existing stratum in the excavation process of the foundation pit, particularly, the requirement on the allowable displacement of the enclosure structure is very strict in the foundation pit construction of the silt stratum which is close to a road, has poor natural bearing capacity and is easy to deform due to disturbance, once the allowable range is exceeded, the influence on the surrounding buildings and the construction safety is very easy to cause, and therefore, the stability of the foundation pit supporting structure is particularly important. The SMW construction method pile support is a common foundation pit support mode, is limited by construction technology, has certain limitation on the depth of the pile in the construction method, comprehensively considers the economic and reasonable principle, adopts a recyclable reinforcement measure to temporarily reinforce the SMW construction method pile support foundation pit support structure, can effectively improve the stability of the support structure, ensures the construction safety and reduces the construction cost.
Disclosure of Invention
The invention aims to provide a reinforcing structure for a pile supporting system in an SMW (soil mixing wall) construction method, which has the advantages of good reinforcing effect, convenience in construction and strong turnover.
The first object of the invention is achieved by the following technical measures: a reinforcing structure for an SMW construction method pile supporting system comprises the SMW construction method pile supporting system, an anchor rope on the outer side of a foundation pit and a cast support on the inner side of the foundation pit, wherein the foundation pit SMW construction method pile supporting system comprises an SMW construction method pile, a crown beam and a foundation pit inner side three-shaft stirring pile foundation bottom reinforcement, the anchor rope on the outer side of the foundation pit is a steel sheet pile with two ends anchored on the outer side of the foundation pit and a prestressed steel strand on construction steel of the SMW construction method pile supporting system, and the cast support on the inner side of the foundation pit is a steel pipe support with two ends supporting a cast base plate and the top beam of the SMW construction.
As an improvement, a reserved hole is formed in a web plate at the top end of an I-shaped steel of the pile constructed by the SMW method, so that an anchor rope can be conveniently punched.
As an improvement, the reinforcing width and depth of the foundation reinforcing triaxial mixing pile at the inner side of the foundation pit are not less than the excavation depth of the foundation pit, the lap joint length is consistent with that of the triaxial mixing pile of the pile in the SMW construction method, and the cement mixing amount is not less than 20%.
As an improvement, the anchor cable is a plurality of bundles of prestressed steel strands, and the arrangement distance is determined according to the calculation requirement.
As an improvement, the anchor cable on the outer side of the foundation pit is anchored on an I-shaped steel waist beam on the back side of the steel sheet pile through an anchor, and the I-shaped steel waist beam is formed by welding 22# a I-shaped steel and a steel base plate.
As an improvement, the Larsen steel sheet pile is a Larsen steel sheet pile (SKSP-IV), the wall thickness is 15.5mm, and the effective length is consistent with that of a triaxial mixing pile of the pile in the construction method.
As an improvement, the inner side of the foundation pit adopts a throwing supportAnd arranging steel pipes, wherein the arrangement distance is consistent with the anchor cables on the outer side of the foundation pit.
As an improvement, an H400 double-spliced steel enclosing purlin is arranged between the top of the cast-support on the inner side of the foundation pit and a top beam of the pile support system based on the SMW construction method, and the H400 double-spliced steel enclosing purlin and the steel pipe support are fully welded.
As the improvement, throw and prop bottom and set up the steel corbel full weld on the preceding bottom plate of pouring, the anchor reinforcing bar of pre-buried in the preceding bottom plate of pouring adopts perforation welding to be connected with the pre-buried steel sheet of steel corbel.
Compared with the prior art, the invention has the following advantages:
(1) through setting up foundation ditch outside anchor rope and foundation ditch inboard throw and prop, draw the interior stake of propping and consolidate SMW worker method pile support system in step outward, great increase the stability of foundation ditch support system, triaxial stirring stake reinforcing foundation ditch face empty side ground simultaneously, the effectual intensity that increases existing ground, it is effectual to consolidate.
(2) The structure of the invention is convenient to construct, the input machinery, materials and the like are conventional resources, the problems caused by the approach of large-scale equipment such as a ground wall trenching machine, a rotary drilling rig, a crawler crane and the like and supporting facilities can be avoided, the construction speed is high, and the efficiency is high.
(3) The invention reinforces the pile supporting system of the SMW construction method, the used I-steel, steel sheet piles, anchor cables, steel pipe supports and the like can be recycled for multiple times, the construction cost is obviously reduced, and the economic benefit is good.
Drawings
Fig. 1 is a schematic sectional view of an SMW-method pile support system according to a reinforcing structure for an SMW-method pile support system of the present invention.
Fig. 2 is a schematic cross-sectional view of an anchor cable on the outer side of a foundation pit of a reinforcing structure for a pile supporting system based on an SMW (soil mixing wall) construction method.
Fig. 3 is a big picture of anchoring of anchor cables outside a foundation pit of the reinforcing structure for an SMW construction method pile supporting system.
Fig. 4 is a big picture of the connection of an I-shaped steel wale of an anchor cable outside a foundation pit of a reinforcing structure for an SMW construction method pile support system.
Fig. 5 is a transverse cross-sectional view of the construction of a steel sheet pile meeting a steel strand of the reinforced structure of the pile support system based on the SMW construction method.
Fig. 6 is a schematic cross-sectional view of an internal support throwing structure of a foundation pit of a reinforcing structure for an SMW (soil mixing wall) construction pile support system.
Fig. 7 is a big picture of a cast-bracing steel corbel of the reinforcing structure for an SMW construction method pile supporting system.
Fig. 8 is a splicing schematic diagram of a cast-support double-spliced type steel surrounding purlin of a reinforcing structure for an SMW construction method pile supporting system.
Fig. 9 is an overall schematic view of a reinforcing structure for a SMW-process pile support system according to the present invention.
Reference numerals: 1. an SMW construction method pile supporting system comprises 101 construction method pile three-axis mixing piles, 102, I-shaped steel, 103, crown beams, 104, foundation reinforcing three-axis mixing piles, 105, I-shaped steel top reserved anchor cable holes, 2, foundation pit outer side anchor cables, 201, prestressed steel strands, 202, Larsen steel sheet piles (SKSP-IV), 203, I-shaped steel waist beams, 204, anchorage devices, 205, butt weld seam (full weld), 206, the steel backing plate, 3, the foundation ditch inboard is thrown and is propped, 301, the steel pipe supports, 302, H400 double pin steel purlin encloses the purlin, 303, the steel bracket, 304, pour the bottom plate earlier, 305, pour the earthwork excavation line when the bottom plate construction earlier, 306, steel bracket welding steel sheet (t is 30mm), 307, steel bracket anchor reinforcing bar (18mm), 308, double pin steel purlin encloses purlin web connecting plate (t is 20mm, interval 400mm), 309, double pin steel purlin encloses purlin flange connecting plate (t is 20mm, interval 400 mm).
Detailed Description
In order to better understand the technical scheme of the invention, the invention is further described in detail by combining the embodiment drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model provides a reinforced structure for SMW worker method stake support system which characterized in that: the ground pit SMW construction method pile supporting system comprises ground pit outer anchor cables 2 and ground pit inner side cast supports 3 which are respectively arranged on two sides of a SMW construction method pile supporting system 1, wherein the ground pit SMW construction method pile supporting system 1 comprises an SMW construction method pile three-axis stirring pile 101, a ground foundation reinforced three-axis stirring pile 104 on the inner side of a ground pit, I-shaped steel 102 inserted into the SMW construction method pile and a crown beam 103 poured on the top of the SMW construction method pile, the ground pit outer anchor cables 2 are steel sheet piles 202 with two ends anchored on the outer side of a ground pit and prestressed steel stranded wires 201 on the I-shaped steel 102 of the SMW construction method pile supporting system 1, and the ground pit inner side cast supports 3 are steel pipe supports 301 with two ends respectively supporting a pouring bottom plate 304 and.
In a preferred embodiment of the present invention, an anchor cable hole 105 is provided in a web at the top end of the i-beam 102 of the SMW-process pile 101, so as to facilitate the anchor cable to be perforated.
As a preferred embodiment of the present invention, the reinforcing width and depth of the foundation reinforcing triaxial mixing pile 104 inside the foundation pit are not less than the excavation depth of the foundation pit, the overlapping length is the same as that of the three-axis mixing pile 101 of the SMW construction method pile, and the cement content is not less than 20%.
As a preferred embodiment of the present embodiment, the anchor cable 2 is a plurality of bundles of prestressed steel strands 201, and the arrangement distance is determined according to the calculation requirement.
In a preferred embodiment of the present invention, the anchor cable 2 outside the foundation pit is anchored on an i-beam 203 at the back side of the larsen steel sheet pile 202 through an anchor 204, and the i-beam 203 is formed by welding 22# a i-beams and steel backing plates.
In a preferred embodiment of the present invention, the larsen steel sheet pile 202 is a larsen steel sheet pile (SKSP-iv), the wall thickness is 15.5mm, and the effective length is consistent with the construction method pile triaxial mixing pile 101.
As a preferred embodiment of the present embodiment, the foundation pit inner side throwing support 3 adoptsThe arrangement distance of the steel pipes 301 is consistent with that of the anchor cables 2 on the outer side of the foundation pit.
As a preferred embodiment of the embodiment, an H400 double-spliced steel surrounding purlin 302 is arranged between the top of the inner side cast support 3 of the foundation pit and the top beam 103 of the SMW construction method pile support system 1, and the H400 double-spliced steel surrounding purlin 302 and the steel pipe support 301 are fully welded.
As a preferred embodiment of this embodiment, the bottom of the inner side casting brace 3 of the foundation pit is fully welded to the steel corbel 303 disposed on the prior casting bottom plate 304, and the anchor steel bar 307 embedded in the prior casting bottom plate is connected to the steel corbel embedded steel plate 306 by perforation welding.
The invention is characterized in that: firstly, constructing a pile supporting system 1 in an SMW construction method, inserting I-shaped steel 103 into a three-axis stirring pile 101 in the construction method and a foundation reinforcing three-axis stirring pile 104, and excavating a construction crown beam 103 after the three-axis stirring pile 101 in the construction method reaches design strength; secondly, constructing an anchor cable 2 on the outer side of the foundation pit, driving a Larsen steel sheet pile (SKSP-IV) 202, erecting an I-shaped steel waist beam 203, installing a steel base plate 206 and an anchorage device 204, penetrating a prestressed steel strand 201 into an anchor cable hole 105 reserved in the top of the I-shaped steel, tensioning the prestressed steel strand 201 to a designed tension and anchoring; excavating the earthwork on the inner side of the foundation pit again until an earthwork excavation line 305 is formed during construction of a first pouring bottom plate, constructing the first pouring bottom plate 304, synchronously embedding and installing a steel bracket 303, maintaining the first pouring bottom plate 304 to the designed strength, erecting an H400 double-spliced steel enclosing purlin 302 on the inner side of the crown beam 103, excavating a groove, installing a steel pipe support 301 in place, and strictly forbidding first excavation and later support; then, excavating earthwork below an earthwork excavation line 305, constructing a bottom plate and a side wall in the range of the cast-support 3 at the inner side of the foundation pit, backfilling a gap between the side wall and the three-axis stirring pile 101 of the construction method pile by using C20 concrete, wherein the backfilling height is not less than 1 m; and then removing the anchor cable 2 on the outer side of the foundation pit and the cast support 3 on the inner side of the foundation pit, and transferring the material equipment to the next construction section for construction.
The above examples are given for the purpose of illustrating the invention clearly and not for the purpose of limiting the same, and it will be apparent to those skilled in the art that, in light of the foregoing description, numerous modifications and variations can be made in the form and details of the embodiments of the invention described herein, and it is not intended to be exhaustive or to limit the invention to the precise forms disclosed.

Claims (9)

1. The utility model provides a reinforced structure for SMW worker method stake support system which characterized in that: the ground pit SMW construction method pile supporting system comprises ground pit outer anchor cables (2) and ground pit inner side cast supports (3) which are arranged on two sides of a SMW construction method pile supporting system (1) respectively, wherein the ground pit outer side anchor cables (2) and the ground pit inner side cast supports (3) respectively, the ground pit SMW construction method pile supporting system (1) comprises an SMW construction method pile three-axis stirring pile (101), a ground pit inner side foundation reinforced three-axis stirring pile (104), I-shaped steel (102) inserted into the SMW construction method pile and a crown beam (103) poured on the top of the SMW construction method pile, the ground pit outer side anchor cables (2) are prestressed steel sheet piles (202) with two ends anchored on the outer side of a ground pit and the I-shaped steel (102) of the SMW construction method pile supporting system (1) respectively, and the ground pit inner side cast supports (3) are steel pipe supports (301.
2. The reinforcing structure for an SMW-process pile support system according to claim 1, wherein: reserved anchor cable holes (105) are formed in a web plate at the top end of an I-shaped steel (102) of the SMW construction method pile (101) so that anchor cable holes can be conveniently punched.
3. The reinforcing structure for an SMW-process pile support system according to claim 1, wherein: the reinforcing width and depth of the foundation reinforcing triaxial mixing pile (104) on the inner side of the foundation pit are not less than the excavation depth of the foundation pit, the overlapping length is consistent with that of the three-axis mixing pile (101) of the pile in the SMW construction method, and the cement mixing amount is not less than 20%.
4. The reinforcing structure for an SMW-process pile support system according to claim 1, wherein: the anchor cable (2) is a plurality of bundles of prestressed steel strands (201), and the arrangement distance is determined according to the calculation requirement.
5. The reinforcing structure for an SMW-process pile support system according to claim 1, wherein: the anchor cable (2) on the outer side of the foundation pit is anchored on an I-shaped steel waist beam (203) on the back side of the Larsen steel sheet pile (202) through an anchor (204), and the I-shaped steel waist beam (203) is formed by welding 22# a I-shaped steel and a steel backing plate.
6. The reinforcing structure for an SMW-process pile support system according to claim 1, wherein: the Larsen steel sheet pile (202) is a Larsen steel sheet pile (SKSP-IV), the wall thickness is 15.5mm, and the effective length is consistent with that of the construction method pile triaxial mixing pile (101).
7. The reinforcing structure for an SMW-process pile support system according to claim 1, wherein: the inner side of the foundation pit is cast and supported (3) by adoptingAnd the arrangement distance of the steel pipes (301) is consistent with that of the anchor cables (2) on the outer side of the foundation pit.
8. The reinforcing structure for an SMW-process pile support system according to claim 1, wherein: h400 double-spliced profile steel surrounding purlin (302) is arranged between the top of the cast support (3) on the inner side of the foundation pit and a crown beam (103) of the pile support system (1) adopting the SMW construction method, and the H400 double-spliced profile steel surrounding purlin (302) and a steel pipe support (301) are fully welded.
9. The reinforcing structure for an SMW-process pile support system according to claim 1, wherein: the bottom of the cast-in-place support (3) on the inner side of the foundation pit is fully welded with a steel corbel (303) arranged on a cast-in-place bottom plate (304), and an anchoring reinforcing steel bar (307) embedded in the cast-in-place bottom plate is connected with a steel corbel embedded steel plate (306) through perforation welding.
CN202010041507.7A 2020-01-15 2020-01-15 A reinforced structure that is used for SMW worker method stake to strut system Pending CN111119198A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010041507.7A CN111119198A (en) 2020-01-15 2020-01-15 A reinforced structure that is used for SMW worker method stake to strut system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010041507.7A CN111119198A (en) 2020-01-15 2020-01-15 A reinforced structure that is used for SMW worker method stake to strut system

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CN111119198A true CN111119198A (en) 2020-05-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113047302A (en) * 2021-03-24 2021-06-29 中国建筑一局(集团)有限公司 A can have enough to meet need encloses purlin for foundation ditch anchor rope is strutted
CN113216994A (en) * 2021-05-06 2021-08-06 中建铁投轨道交通建设有限公司 Construction method for correcting deviation by overexcavation of inserted hob of shield tunneling machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113047302A (en) * 2021-03-24 2021-06-29 中国建筑一局(集团)有限公司 A can have enough to meet need encloses purlin for foundation ditch anchor rope is strutted
CN113216994A (en) * 2021-05-06 2021-08-06 中建铁投轨道交通建设有限公司 Construction method for correcting deviation by overexcavation of inserted hob of shield tunneling machine

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