CN118481155B - A double-row core soil steel plate device constructed by retreat method - Google Patents
A double-row core soil steel plate device constructed by retreat method Download PDFInfo
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- CN118481155B CN118481155B CN202410739801.3A CN202410739801A CN118481155B CN 118481155 B CN118481155 B CN 118481155B CN 202410739801 A CN202410739801 A CN 202410739801A CN 118481155 B CN118481155 B CN 118481155B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 214
- 239000010959 steel Substances 0.000 title claims abstract description 214
- 239000002689 soil Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims description 10
- 239000004576 sand Substances 0.000 claims abstract description 28
- 238000010276 construction Methods 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims 1
- 239000004927 clay Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—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
- E02D5/06—Fitted piles or other elements specially adapted for closing gaps between two sheet piles or between two walls of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/40—Miscellaneous comprising stabilising elements
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a double-row core soil steel plate device for back-off construction, which relates to the technical field of constructional engineering. When the support area of a single support unit is smaller, stable support can be provided only by the outer ring steel sheet pile and the inner ring steel sheet pile, auxiliary supports are not required to be additionally arranged on the inner sides of the outer ring steel sheet pile and the inner ring steel sheet pile, and the influence of the auxiliary supports on subsequent structural construction caused by the inner sides of the outer ring steel sheet pile and the inner ring steel sheet pile can be effectively reduced. In addition, soil layers and sand piles which are easy to construct and low in cost are arranged between the inner ring steel sheet pile and the outer ring steel sheet pile, so that the stress around the inner ring steel sheet pile and the outer ring steel sheet pile is effectively dispersed, the possibility of stress concentration around the inner ring steel sheet pile and the outer ring steel sheet pile is reduced, and the risk of deformation of the inner ring steel sheet pile and the outer ring steel sheet pile is reduced.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a double-row core soil steel plate device for back-off construction.
Background
With the rapid development of national economy, urban land is short, and constructional engineering and traffic engineering extend to high altitude and further develop to deep underground space. The problem of comprehensive utilization of underground space is becoming more important, so that the problem of comprehensive utilization of underground space becomes one of key problems for restricting rapid development of urban construction. Deep foundation pits are increasingly widely used, and the deep foundation pit refers to projects with excavation depth of 5 meters or more than 5 meters or with depth of less than 5 meters, but with particularly complex geological conditions, surrounding environment and underground pipelines.
In some projects, it is desirable to perform foundation pit operations in the vicinity of an existing building. An invisible building red line exists between a foundation pit to be constructed and an existing building, and the invisible building red line directly influences the side thrust in the construction process and relates to the safe use of the existing building.
Chinese patent CN102444132A provides a relay type double-row steel sheet pile underwater deep foundation pit supporting structure, which comprises a double-row steel sheet pile external enclosure structure and an internal horizontal supporting structure, wherein the double-row steel sheet pile external enclosure structure comprises an outer side steel sheet pile and an inner side steel sheet pile which are parallel to each other, the top end of the outer side steel sheet pile is higher than the inner side steel sheet pile, a filling wall is filled between the outer side steel sheet pile and the inner side steel sheet pile, the lower part of the filling wall is clay, and the upper part of the filling wall is concrete.
The structure adopts the principle of the thin-wall strong support, through the double-row steel sheet pile supporting structure with low inner side and high outer side outside the deep foundation pit, the combined system with the multi-channel horizontal support waist beam is arranged inside, the structure is safe, the problem that the steel sheet pile cannot be adopted in the foundation pit with larger depth is solved, the problem that the double-layer steel sheet pile is arranged in parallel and the application depth is limited is solved, and the limitation of shallow application depth of the steel sheet pile in the deep foundation pit is broken through.
In the structure, the filling wall is made of clay and concrete, and the construction process is complex, long in time consumption and high in cost.
Disclosure of Invention
Aiming at the problems of complex construction process, long time consumption and high cost of a filling wall made of clay and concrete in the existing supporting structure of double-row steel sheet piles of a deep foundation pit, the invention aims to provide a double-row core soil steel plate device for back-off construction, which comprises at least one supporting unit, wherein the supporting unit comprises an outer ring steel sheet pile, an inner ring steel sheet pile, a soil layer and a sand pile.
The inner ring steel sheet pile and the outer ring steel sheet pile are vertically arranged, the outer ring steel sheet pile is positioned outside the inner ring steel sheet pile. The space between the inner ring steel sheet pile and the outer ring steel sheet pile is filled with a soil layer (13), a plurality of vertical holes are formed in the soil layer around the inner ring steel sheet pile, sand is filled in each vertical hole to form a sand pile, and the porosity of the sand is larger than that of the soil layer.
When the supporting units are multiple, at least one surface of the outer ring steel sheet pile of each supporting unit is parallel to the outer ring steel sheet piles of other supporting units.
The invention is further arranged that the top end of the outer ring steel sheet pile is higher than the top end of the inner ring steel sheet pile, or the top end of the outer ring steel sheet pile is level with the top end of the inner ring steel sheet pile.
The invention is further arranged such that the bottom end of the outer ring steel sheet pile is lower than the bottom end of the inner ring steel sheet pile.
The invention is further arranged that the bottom end of the sand pile is lower than the bottom end of the inner ring steel sheet pile.
The invention further provides that the horizontal section of the inner ring steel sheet pile and the horizontal section of the outer ring steel sheet pile are rectangular.
The invention is further characterized in that a plurality of support units are arranged, all support units are horizontally and linearly arranged, and outer ring steel sheet piles of two adjacent support units are connected.
The invention is further arranged to further comprise two linear supporting steel sheet piles, wherein all the supporting units are positioned between the two linear supporting steel sheet piles, and the length directions of the two linear supporting steel sheet piles are parallel to the horizontal linear arrangement direction of all the supporting units.
The invention further provides that the supporting unit further comprises an enclosing purlin, and a circle of enclosing purlin is fixed at the top of the inner side of the inner ring steel sheet pile.
The support unit further comprises a support beam, and two ends of the support beam are fixedly connected with different inner side surfaces of the enclosing purlin respectively. The support beam is provided with at least one.
The invention further provides that the support unit further comprises grouting layers, and grouting layers are arranged on the inner side and the outer side of the outer ring steel sheet pile.
In summary, compared with the prior art, the invention has the following beneficial effect that the double-row steel sheet pile supporting structure is improved into the annular modularized supporting unit. When the support area of a single support unit is smaller, stable support can be provided only by the outer ring steel sheet pile and the inner ring steel sheet pile, auxiliary supports are not required to be additionally arranged on the inner sides of the outer ring steel sheet pile and the inner ring steel sheet pile, and the influence of the auxiliary supports on subsequent structural construction caused by the inner sides of the outer ring steel sheet pile and the inner ring steel sheet pile can be effectively reduced. In addition, soil layers and sand piles which are easy to construct and low in cost are arranged between the inner ring steel sheet pile and the outer ring steel sheet pile, so that the stress around the inner ring steel sheet pile and the outer ring steel sheet pile is effectively dispersed, the possibility of stress concentration around the inner ring steel sheet pile and the outer ring steel sheet pile is reduced, and the risk of deformation of the inner ring steel sheet pile and the outer ring steel sheet pile is reduced.
Drawings
FIG. 1 is a top view of an embodiment;
Fig. 2 is a cross-sectional view showing a support unit.
In the figure, 1, a supporting unit, 11, an outer ring steel sheet pile, 12, an inner ring steel sheet pile, 13, a soil layer, 14, a sand pile, 15, an enclosing purlin, 16, a supporting beam, 2, a linear supporting steel sheet pile and 3, an existing building.
Detailed Description
The technical solutions of the present invention will be clearly described below with reference to the accompanying drawings, and it is obvious that the described embodiments are not all embodiments of the present invention, and all other embodiments obtained by a person skilled in the art without making any inventive effort are within the scope of protection of the present invention.
It should be noted that, the positional or positional relationship indicated by the terms such as "center", "upper", "lower", "horizontal", "left", "right", "front", "rear", "lateral", "longitudinal", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Examples
As shown in fig. 1-2, which is a basic structure of a preferred embodiment of the present invention, the present embodiment provides a double-row core soil steel plate apparatus for back-off construction, which comprises at least one supporting unit 1, wherein the supporting unit 1 comprises an outer ring steel plate pile 11, an inner ring steel plate pile 12, a soil layer 13 and a sand pile 14.
In this embodiment, the inner ring steel sheet pile 12 and the outer ring steel sheet pile 11 are vertically arranged, and the outer ring steel sheet pile 11 is located outside the inner ring steel sheet pile 12. In the embodiment, the double-row steel sheet pile supporting structures are symmetrically arranged on two sides of a construction area, the annular modularized supporting units 1 are improved, and a constructor selects the supporting area of each supporting unit 1, the horizontal cross-section shape of each supporting unit 1 and the number of the supporting units 1 in the construction area according to the size and the shape of the construction area. In this embodiment, the horizontal sections of the outer ring steel sheet pile 11 and the inner ring steel sheet pile 12 in each supporting unit 1 are polygonal. Each side wall of the outer ring steel sheet pile 11 can provide auxiliary support for two adjacent side walls, each side wall of the inner ring steel sheet pile 12 can provide auxiliary support for two adjacent side walls, when the support area of the single support unit 1 is smaller, stable support can be provided only by the outer ring steel sheet pile 11 and the inner ring steel sheet pile 12, auxiliary support is not required to be additionally arranged on the inner sides of the outer ring steel sheet pile 11 and the inner ring steel sheet pile 12, and the influence of the auxiliary support arranged on the inner sides of the outer ring steel sheet pile 11 and the inner ring steel sheet pile 12 on subsequent structural construction can be effectively reduced.
On this basis, the present embodiment provides a soil layer 13 between the inner ring steel sheet pile 12 and the outer ring steel sheet pile 11. When the inner ring steel sheet pile 12 and the outer ring steel sheet pile 11 are anchored into the soil, the soil cut by the inner ring steel sheet pile 12 and the outer ring steel sheet pile 11 naturally forms a soil layer 13 between the inner ring steel sheet pile 12 and the outer ring steel sheet pile 11, no additional filling is needed, and compared with the existing filling wall made of concrete and clay, the operation is simple, and the cost is low. The formation of the soil layer 13 can ensure that the inner ring steel sheet pile 12 and the outer ring steel sheet pile 11 always have a gap, so that the stress around the inner ring steel sheet pile 12 and the outer ring steel sheet pile 11 is effectively dispersed, and the possibility of stress concentration around the inner ring steel sheet pile 12 and the outer ring steel sheet pile 11 is reduced.
In this embodiment, the outer ring steel sheet pile 11 and the inner ring steel sheet pile 12 have the same shape and different sizes, and the longitudinal center line of the outer ring steel sheet pile 11 and the longitudinal center line of the inner ring steel sheet pile 12 are collinear, so that the thickness of the soil layer 13 in the horizontal direction is basically consistent everywhere, and the uniformity of auxiliary support provided by the outer ring steel sheet pile 11 to the inner ring steel sheet pile 12 is improved.
Further, in this embodiment, a plurality of vertical holes are formed around the inner ring steel sheet pile 12 on the soil layer 13, and each vertical hole is filled with sand to form a sand pile 14, wherein the porosity of the sand is greater than that of the soil layer 13. The outer ring steel sheet pile 11 allows deformation, and unloading based on vertical holes and sand piles 14 can be realized by utilizing the maximum deformation allowed by the existing building 3 and the outer ring steel sheet pile 11, so that the possibility of load transmission to the inner ring steel sheet pile 12 is reduced. The sand pile 14 is easy to construct and low in cost. Meanwhile, the sand piles 14 can also serve as drainage channels, so that moisture in soil bodies is reduced, and the stability of the soil bodies is improved.
Further, when the number of the supporting units 1 is plural, at least one surface of the outer ring steel sheet pile 11 of each supporting unit 1 is parallel to the outer ring steel sheet piles 11 of the other supporting units 1. When the device is constructed, the construction of different support units 1 can be sequentially carried out, and the support units 1 constructed firstly and the original soil body structure are used as a whole to provide support for the support units 1 constructed later.
Further, the top end of the outer ring steel sheet pile 11 is higher than the top end of the inner ring steel sheet pile 12, or the top end of the outer ring steel sheet pile 11 is flush with the top end of the inner ring steel sheet pile 12, so that the lateral pressure born by the top of the inner ring steel sheet pile 12 is reduced, and the structural stability and reliability of the top of the inner ring steel sheet pile 12 are improved. The top end of the outer ring steel sheet pile 11 is higher than the top end of the inner ring steel sheet pile 12 in this embodiment.
Further, the bottom end of the outer ring steel sheet pile 11 is lower than the bottom end of the inner ring steel sheet pile 12 to increase the depth of the whole support unit 1, improve the resistance of the support unit 1 to lateral soil pressure, reduce the probability of soil deformation and displacement, and improve the stability, safety and reliability of the support unit 1.
Further, the bottom end of the sand pile 14 is lower than the bottom end of the inner ring steel sheet pile 12, so as to reduce the lateral pressure born by the inner ring steel sheet pile 12 at all height positions and improve the protection effect of the sand pile 14 on the inner ring steel sheet pile 12.
Further, in this embodiment, the horizontal section of the inner ring steel sheet pile 12 and the horizontal section of the outer ring steel sheet pile 11 are rectangular, so as to facilitate assembly of the plurality of support units 1.
Further, the supporting unit 1 further includes an enclosing purlin 15, and the enclosing purlin 15 is fixed on the top of the inner side of the inner ring steel sheet pile 12, so as to enhance the structural stability and reliability of the top of the inner ring steel sheet pile 12.
Further, the supporting unit 1 further includes a supporting beam 16, and two ends of the supporting beam 16 are fixedly connected with different inner side surfaces of the enclosing purlin 15 respectively. The support beam 16 is provided with at least one. The support beam 16 is horizontal in this embodiment. In addition, the supporting beams 16 are divided into two types, one supporting beam 16 is a cross brace, two ends of the cross brace are respectively and fixedly connected with two sides of the enclosing purlin 15, which are parallel to each other, and the cross brace is arranged in the embodiment. The other support beam 16 is an inclined strut, and two ends of the inclined strut are fixedly connected with two edges corresponding to the same included angle in the enclosing purlin 15 respectively. In this embodiment, a diagonal brace is fixed at each included angle of the enclosing purlin 15.
In this embodiment, a plurality of support units 1 are provided, all support units 1 are horizontally and linearly arranged, and outer ring steel sheet piles 11 of two adjacent support units 1 are connected. When the device is installed, one supporting unit 1 is firstly constructed on soil near the existing building 3, the supporting unit 1 is used as a foundation to retreat in a horizontal linear direction far away from the existing building 3, and the rest supporting units 1 are sequentially constructed.
Further, this embodiment still includes linear support steel sheet pile 2, linear support steel sheet pile 2 sets up two, and all support unit 1 all are located between two linear support steel sheet piles 2, and the length direction of two linear support steel sheet piles 2 all is on a parallel with the horizontal linear direction of arranging of all support unit 1, and all support unit 1 all can obtain the auxiliary stay power from linear support steel sheet pile 2, further improves the stability and the reliability of whole device.
Further, the supporting unit 1 further comprises grouting layers, and grouting layers are arranged on the inner side and the outer side of the outer ring steel sheet pile 11. The grouting layer is the last part of the construction of the single support unit 1. The supporting unit 1 and the original soil body structure which are already constructed are taken as a whole, a certain gap is always formed between the outer ring steel sheet pile 11 of the supporting unit 1 and the whole in construction, grouting filling is carried out on the inner side and the outer side of the outer ring steel sheet pile 11, and finally the formed grouting layer tightly connects the inner side and the outer side of the outer ring steel sheet pile 11 with the whole, so that the structural stability and the reliability of the whole are further improved. Not shown in the grouting layer diagram.
In this embodiment, the structures except the sand piles 14 and the soil layer 13 can be prefabricated, so as to improve the construction efficiency.
The construction method of the single support unit 1 comprises the following steps:
Firstly, constructing an outer ring steel sheet pile 11 on the soil body, digging the soil body on the inner side of the outer ring steel sheet pile 11 to a certain depth, inside the outer ring steel sheet pile 11 and constructing the inner ring steel sheet piles 12 by soil. The soil layer 13 between the outer ring steel sheet pile 11 and the inner ring steel sheet pile 12 is then vertically drilled, and the drilled vertical holes are backfilled with sand to form sand piles 14. Then the soil body on the inner side of the inner ring steel sheet pile 12 is excavated down to a set building base surface, and the enclosing purlin 15 and the supporting beam 16 are additionally arranged on the inner side of the inner ring steel sheet pile 12. And finally grouting the inner side and the outer side of the outer ring steel sheet pile 11, and filling gaps among the support unit 1, the soil body structure and the existing building 3 structure, so that the support unit 1, the soil body structure and the existing building 3 structure are firmly connected.
In summary, the present embodiment improves the double-row steel sheet pile support structure into the annular modularized support unit 1. When the supporting area of the single supporting unit 1 is smaller, stable supporting can be provided only by the outer ring steel sheet pile 11 and the inner ring steel sheet pile 12, auxiliary supports are not required to be additionally arranged on the inner sides of the outer ring steel sheet pile 11 and the inner ring steel sheet pile 12, and the influence of the auxiliary supports on subsequent structural construction on the inner sides of the outer ring steel sheet pile 11 and the inner ring steel sheet pile 12 can be effectively reduced. In addition, the soil layer 13 and the sand piles 14 which are easy to construct and low in cost are arranged between the inner ring steel sheet pile 12 and the outer ring steel sheet pile 11, so that the stress of soil around the inner ring steel sheet pile 12 and the outer ring steel sheet pile 11 is effectively dispersed, the possibility of stress concentration around the inner ring steel sheet pile 12 and the outer ring steel sheet pile 11 is reduced, and the risk of deformation of the inner ring steel sheet pile 12 and the outer ring steel sheet pile 11 is reduced.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The double-row core soil steel plate device for the back-off construction is characterized by comprising at least one supporting unit (1), wherein the supporting unit (1) comprises an outer ring steel plate pile (11), an inner ring steel plate pile (12), a soil layer (13) and sand piles (14), the inner ring steel plate pile (12) and the outer ring steel plate pile (11) are vertically arranged, the outer ring steel plate pile (11) is positioned at the outer side of the inner ring steel plate pile (12), a space between the inner ring steel plate pile (12) and the outer ring steel plate pile (11) is filled with the soil layer (13), a plurality of vertical holes are formed in the soil layer (13) around the inner ring steel plate pile (12), sand piles (14) are formed by filling sand into each vertical hole, and the porosity of the sand is larger than that of the soil layer (13);
Wherein the top end of the outer ring steel sheet pile (11) is higher than the top end of the inner ring steel sheet pile (12), or the top end of the outer ring steel sheet pile (11) is flush with the top end of the inner ring steel sheet pile (12);
the bottom end of the outer ring steel sheet pile (11) is lower than the bottom end of the inner ring steel sheet pile (12);
The bottom end of the sand pile (14) is lower than the bottom end of the inner ring steel sheet pile (12);
when the number of the supporting units (1) is multiple, at least one surface of the outer ring steel sheet pile (11) of each supporting unit (1) is parallel to the outer ring steel sheet piles (11) of other supporting units (1);
The construction method comprises the steps of firstly constructing an outer ring steel sheet pile on a soil body, digging the soil body on the inner side of the outer ring steel sheet pile to a certain depth, constructing an inner ring steel sheet pile on the soil body on the inner side of the outer ring steel sheet pile, then vertically drilling soil layers between the outer ring steel sheet pile and the inner ring steel sheet pile, backfilling sand into the drilled vertical holes to form sand piles, digging the soil body on the inner side of the inner ring steel sheet pile to a set building base surface, additionally installing enclosing purlins and supporting beams on the inner side of the inner ring steel sheet pile, grouting the inner side and the outer side of the outer ring steel sheet pile, and filling gaps among supporting units, soil structures and existing building structures to ensure that the supporting units, the soil structures and the existing building structures are firmly connected.
2. The device for constructing double-row core soil steel plates by adopting the backward method according to claim 1, wherein the horizontal section of the inner ring steel plate pile (12) and the horizontal section of the outer ring steel plate pile (11) are rectangular.
3. The device for constructing double-row core soil steel plates by adopting the backing method according to claim 2 is characterized in that a plurality of support units (1) are arranged, all the support units (1) are horizontally and linearly arranged, and outer ring steel sheet piles (11) of two adjacent support units (1) are connected.
4. The device for constructing double-row core soil steel plates by using the backing method according to claim 3, further comprising two linear supporting steel plate piles (2), wherein all supporting units (1) are positioned between the two linear supporting steel plate piles (2), and the length directions of the two linear supporting steel plate piles (2) are parallel to the horizontal linear arrangement direction of all the supporting units (1).
5. The device for constructing double-row core soil steel plates by adopting the backing method according to any one of claims 1 to 4, wherein the supporting unit (1) further comprises an enclosing purlin (15), and a circle of enclosing purlin (15) is fixed at the top of the inner side of the inner ring steel plate pile (12).
6. The device for constructing double-row core soil steel plates by adopting the backing method according to claim 5, wherein the supporting unit (1) further comprises supporting beams (16), two ends of each supporting beam (16) are fixedly connected with different inner side surfaces of the surrounding purlin (15), and at least one supporting beam (16) is arranged.
7. The double-row core soil steel plate device for back construction according to any one of claims 1 to 4, wherein the supporting unit (1) further comprises grouting layers, and grouting layers are arranged on the inner side and the outer side of the outer ring steel plate pile (11).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410739801.3A CN118481155B (en) | 2024-06-07 | 2024-06-07 | A double-row core soil steel plate device constructed by retreat method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410739801.3A CN118481155B (en) | 2024-06-07 | 2024-06-07 | A double-row core soil steel plate device constructed by retreat method |
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| CN118481155B true CN118481155B (en) | 2025-01-28 |
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| JP2002201623A (en) * | 2000-12-28 | 2002-07-19 | Nkk Corp | Double sheet pile type revetment and construction method |
| CN102444132A (en) * | 2011-09-15 | 2012-05-09 | 中国建筑第六工程局有限公司 | Relay type double-row steel sheet pile underwater deep foundation pit supporting structure and construction method |
| CN106284296B (en) * | 2016-09-28 | 2019-04-23 | 南京工业大学 | Supporting structure of double-row steel sheet piles and construction method thereof |
| CN117552431A (en) * | 2022-08-04 | 2024-02-13 | 广东工业大学 | A microbial double-row steel sheet pile foundation pit support structure |
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2024
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109235422A (en) * | 2018-10-16 | 2019-01-18 | 中铁第四勘察设计院集团有限公司 | A kind of double steel sheet pile fabricated structure of steel purlin |
| CN114045808A (en) * | 2021-10-26 | 2022-02-15 | 中国电建集团华东勘测设计研究院有限公司 | Reinforcing structure and construction method of deep soft soil foundation combined with concrete lattice wall and bulk material pile |
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| CN118481155A (en) | 2024-08-13 |
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