CN212612499U - Supporting and water-stopping double-layer steel sheet pile enclosure structure for weak stratum - Google Patents
Supporting and water-stopping double-layer steel sheet pile enclosure structure for weak stratum Download PDFInfo
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- CN212612499U CN212612499U CN202020339423.7U CN202020339423U CN212612499U CN 212612499 U CN212612499 U CN 212612499U CN 202020339423 U CN202020339423 U CN 202020339423U CN 212612499 U CN212612499 U CN 212612499U
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Abstract
A supporting structure for a double-layer steel sheet pile for supporting and stopping water in a weak stratum is characterized in that a soil nail wall for slope relief is arranged at the upper part of the side wall of a foundation pit, outer side steel sheet piles are arranged at the lower end of the soil nail wall, parallel inner side steel sheet piles are arranged on the inner sides of the outer side steel sheet piles at intervals, and the outer side steel sheet piles and the top ends of the inner side steel sheet piles are mutually supported through transverse supports and concave surrounding purlins; the inner side of the inner steel sheet pile is provided with an inclined support, a concave surrounding purlin is also arranged between the upper end of the inclined support and the inner side of the inner steel sheet pile, and the lower end of the inclined support is supported on the foundation of a main building structure and is provided with a concrete base. The advantages are that: the upper part adopts the slope soil nail wall, the lower part adopts the double-layer steel sheet pile with the connection structure, and the inclined support is arranged, so that the requirement of safety and stability can be met, the construction period can be short, the construction is easy, the steel sheet pile and the supporting facilities can be recycled, the environment is more environment-friendly and intensive, and the defect that the road surface sinks easily due to the construction of soil nails or anchor rods under the roadbed is overcome.
Description
Technical Field
The utility model relates to a water conservancy and building field especially relate to a weak stratum is strutted stagnant water double-deck steel sheet pile envelope.
Background
At present, no important building structures, roads, pipelines and the like are generally arranged around a third-level foundation pit or even a second-level foundation pit in Beijing areas, and the slope of the edge of the pit can be set to 1:0.3, even 1:0.5, the earth-nailed wall support type or the composite earth-nailed wall type is first conceived. The supporting type of the soil nailing wall or the composite soil nailing wall has the problems that the sprayed concrete pollutes the environment, the embedding length is not enough, and the soil nailing or anchor rod is easy to cause the sinking of the road surface in the construction under the roadbed, so that the requirements of the specification and the construction can not be met, and the safety of a foundation pit can not be ensured.
Disclosure of Invention
The utility model relates to a weak stratum is strutted stagnant water double-deck steel sheet pile envelope to there is the above-mentioned problem in solving prior art.
The technical scheme of the utility model is that: a weak stratum supporting and water-stopping double-layer steel sheet pile enclosure structure is characterized by comprising a soil nail wall, soil nails, outer side steel sheet piles, inner side steel sheet piles, transverse supports, inclined supports and a concrete base, wherein the upper part of the side wall of a foundation pit is provided with the soil nail wall for slope arrangement, the lower end of the soil nail wall is provided with the outer side steel sheet piles, the inner sides of the outer side steel sheet piles are provided with the inner side steel sheet piles parallel to the outer side steel sheet piles at intervals, a plurality of transverse supports are arranged between the outer side steel sheet piles and the top ends of the inner side steel sheet piles, and two ends of each transverse support are provided with concave purlins; an inclined support is arranged on the inner side of the inner steel sheet pile, a concave enclosing purlin is also arranged between the upper end of the inclined support and the inner side of the inner steel sheet pile, and the lower end of the inclined support is supported on the foundation of a main building structure and is provided with a concrete base; the bottom surface of the concave enclosing purlin is welded with the surface of the corresponding outer side steel sheet pile or inner side steel sheet pile, and the two ends of the transverse support or the top end of the inclined support are arranged in the corresponding groove of the concave enclosing purlin.
The utility model has the advantages that: the upper part adopts a slope-laying soil nail wall, the lower part adopts a double-layer steel sheet pile with a connection structure, and the lower part is provided with a support form of an inclined support. The method can meet the requirements of safety and stability, and also has the advantages of short construction period, easy implementation, economy, environmental protection and applicability. The steel sheet pile and the supporting facilities thereof can be recycled, so that the method is more environment-friendly and intensive, the construction speed is high, and the defect that the road surface is easy to sink when the soil nails or the anchor rods are constructed under the roadbed is overcome.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Description of reference numerals: 1. soil nail wall, 2, soil nail, 3, outside steel sheet pile, 4, channel-section steel, 5, horizontal support, 6, diagonal bracing, 7, concrete base, 8, major structure, 9, ground, 10, inboard steel sheet pile.
Detailed Description
Referring to fig. 1, the utility model relates to a weak stratum supporting stagnant water double-deck steel sheet pile retaining structure, which is characterized in that, including soil nail wall 1, soil nail 2, outside steel sheet pile 3, inside steel sheet pile 10, horizontal support 5, diagonal support 6 and concrete base 7, the upper portion of the foundation pit lateral wall is equipped with the soil nail wall 1 of putting the slope, the lower extreme of this soil nail wall 1 is equipped with outside steel sheet pile 3, the inboard interval of this outside steel sheet pile 3 is equipped with the inboard steel sheet pile 10 parallel with it, be equipped with many horizontal supports 5 between this outside steel sheet pile 3 and the inboard steel sheet pile 10 top, both ends of this horizontal support 5 are equipped with spill purlin 4; an inclined support 6 is arranged on the inner side of the inner steel sheet pile 10, another concave surrounding purlin 4 is arranged between the upper end of the inclined support 6 and the inner side of the inner steel sheet pile 10, the lower end of the inclined support 6 is supported on the foundation of a main building structure, and a concrete base 7 is arranged. The bottom surface of the concave enclosing purlin 4 is welded with the surface of the corresponding outer side steel sheet pile 3 or inner side steel sheet pile 10, and the two ends of the transverse support 5 or the top end of the inclined support 6 are arranged in the corresponding groove of the concave enclosing purlin 4.
The upper end and the lower end of the soil nailing wall 1 are respectively provided with an upper end platform 11 and a lower end platform 12.
The utility model discloses establish at soil nail wall 1 on foundation ditch lateral wall upper portion, its advantage is easy to implement in anhydrous stratum, has implemented and has plucked the cap, easily clears up underground barrier, still can save high space for the construction on the ground; the manufacturing cost of the soil nailing wall 1 is saved compared with that of a pile anchor; two platforms about soil nailing wall 1 can be for personnel's walking or settle safety barrier or stack the turnover materials such as certain template and create the condition, still can create convenient condition for later stage construction, for example pipeline business turn over basement, if adopt the stake to strut, will punch just very inconveniently on the stake, if punch just convenient many on soil nailing wall. However, the soil nails of the soil nail wall need to be long enough to meet the requirements of tensile strength and overall stability.
The utility model discloses the model of double outside steel sheet pile 3 and inboard steel sheet pile 10 is selected according to conventional calculation, and the model is selected generally to be not less than larsen IV type steel sheet pile, and the distance is generally 0.8 ~ 3.0m between two rows of steel sheet piles, and the consolidation degree of depth satisfies standard antidumping overall stability factor of safety and is not less than 1.2 requirement.
The connection structure between two rows of steel sheet piles is that horizontal support 5 adopts the steel pipe, and the steel pipe both ends are supported in the recess that the purlin 4 was enclosed in the spill to mutual welding together, the spill encloses the purlin 4 and can adopt the channel-section steel to make, and weld together in the steel sheet pile. The distance between steel pipes adopted by the transverse support 5 is generally 1.0-2.0 m, the diameter of the steel pipe is matched with the specification of channel steel, the diameter is generally not less than 200mm, and the wall thickness is not less than 6 mm. The inclined support 6 is made of steel pipes with the diameter not smaller than 200mm and the thickness not smaller than 10mm, the inclination angle is preferably 45 degrees, the horizontal distance can be selected from 2.0-3.0 m generally, and the concrete base 7 at the lower end of the inclined support 6 can be a reinforced concrete strip foundation with the width of 1000mm and the height of 500 mm.
The lower part of the foundation pit is supported by the inclined strut, so that the foundation pit has the advantages of reasonable stress compared with an anchor rod, extremely low frictional resistance provided by soil, incapability of meeting the requirements of integral stability and local stability of the foundation pit even if the anchor rod is very long, and strong deformation resistance. Meanwhile, the construction is convenient, and the construction can be dismantled and recycled at the later stage. The environmental protection and the integration are obvious.
The utility model discloses a concrete application example introduces as follows:
1. brief introduction to the engineering
The project is located in Suzhou lump town of Hai lake region. The system realizes water body circulation of the south sand river and the branch channels thereof, is used as a flood discharge channel, and is used for supplementing water to branch channels of front willow forest channels, rear willow forest channels, front sand mountain ditches and rear sand mountain ditches without base flow in a river course in a dry season. The water system treatment target of the water ecosystem for gradually recovering the health of the river channel is achieved.
The pipeline route is that a Beijing dense water channel and a later-Sanjian ditch are crossed and started, a pump station is planned and stopped at the south sand river side of the east side of the Daohiang lake bridge, the total length of the pipeline is 6711m, and the pipeline is DN800mm and DN1200mm welded steel pipes. Newly-built one of water replenishing pump stations in the green lake district, the pump station adopts 3 water pumps, 2 uses 1 spare, according to the circulation scale, the water intake scale is 1.24m3And/s, the installed power is 750kW, and the head is 27 m. The pump station is of an underground reinforced concrete structure and consists of a distribution pool, a water collecting pump pool and a water outlet valve well. The size of the structural pool is: lxb × H35.4 × 15.4 × 6.95m, effective volume 275m3The pump station water outlet main pipe is provided with a flow meter well, an electromagnetic flow meter and a pressure sensor, and the flow meter installation meets the pipe diameter length requirement of multiple of front 5 and back 3.
2. Main engineering content
The pump station is located at the east side of the rice fragrant lake road, the north bank of the south sand river, the engineering scale is a small (2) type pump station, and the building grade is 5. The pump station is positioned at the east side of the rice fragrant lake road, on the north bank of the south sand river, the design elevation of the north bank is 43.20m, the normal water level of the water intake river is 41.60m, and the bottom elevation of the pump station is planned to be 35.40 m. The three adjacent water parts of the foundation pit of the pump station adopt double-layer steel sheet pile cofferdams, the total length is 104m, Larsen type IV steel sheet piles are adopted, the length of each steel sheet pile is 12m, and the soil penetration depth is 8.5 m. The net width between the double-layer steel sheet piles is 0.8m, an anti-seepage film is paved on the upstream surface of the outer side of the weir body, soil bags are adopted to fill the presser feet, and the width of the anti-seepage film presser foot is 3 times of the water head height. And a soil nailing wall is adopted for supporting within 2.5m below the top of the north embankment slope of the pump station foundation pit, a Larsen IV type double-layer steel sheet pile is adopted for supporting below the soil nailing wall, the length of the steel sheet pile is 12m, the soil penetration depth is 6.7m, and the length of the revetment is 60 m.
Design parameters of the soil nailing wall;
| position of | Length of soil nail | Vertical spacing | Transverse spacing | Angle of rotation | Reinforcing bar |
| First pass | 9m | 1.20m | 1.50m | 15° | 1Φ20 |
| Second pass | 7m | 1.20m | 1.50m | 15° | 1Ф20 |
The lower part of the soil nailing wall is supported by Larsen IV type double-row steel sheet piles (an outer side steel sheet pile 3 and an inner side steel sheet pile 10), the length of the steel sheet pile is 12m, the soil penetration depth is 6.7m, and the length of the revetment is 60 m. The net width of the two rows of steel sheet piles is 0.8m, steel pipes with the diameter DN200 x 6 are adopted between the steel sheet piles as transverse supports 5, two ends of each transverse support 5 are connected with 25 a-shaped channel steel (used as a concave surrounding purlin 4), and the horizontal distance between the transverse supports 5 is 1.5 m. The inclined support 6 adopts a steel pipe with the diameter DN200 x 10, the horizontal distance is 3.0m, and the inclined support 6 is based on a reinforced concrete strip-shaped concrete base 7 with the width of 1000mm and the height of 500 mm.
Claims (7)
1. A weak stratum supporting and water-stopping double-layer steel sheet pile enclosure structure is characterized by comprising a soil nail wall (1), soil nails (2), outer side steel sheet piles (3), inner side steel sheet piles (10), transverse supports (5), inclined supports (6) and a concrete base (7), wherein the upper part of the side wall of a foundation pit is provided with the soil nail wall (1) for slope placement, the lower end of the soil nail wall (1) is provided with the outer side steel sheet piles (3), the inner sides of the outer side steel sheet piles (3) are provided with the inner side steel sheet piles (10) parallel to the outer side steel sheet piles at intervals, a plurality of transverse supports (5) are arranged between the outer side steel sheet piles (3) and the top ends of the inner side steel sheet piles (10), and two ends of each transverse support (5) are provided with concave enclosing purlins (4); an inclined support (6) is arranged on the inner side of the inner steel sheet pile (10), a concave surrounding purlin (4) is also arranged between the upper end of the inclined support (6) and the inner side of the inner steel sheet pile (10), the lower end of the inclined support (6) is supported on the foundation of a main building structure, and a concrete base (7) is arranged; the bottom surface of the concave enclosing purlin (4) is welded with the surface of the corresponding outer side steel sheet pile (3) or inner side steel sheet pile (10), and the two ends of the transverse support (5) or the top end of the inclined support (6) are arranged in the corresponding groove of the concave enclosing purlin (4) and are welded.
2. The weak stratum supporting and water-stopping double-layer steel sheet pile envelope structure as claimed in claim 1, wherein the concave enclosing purlin (4) is made of channel steel.
3. The weak stratum supporting and water-stopping double-layer steel plate pile envelope structure as claimed in claim 1, wherein the transverse support (5) and the oblique support (6) are steel pipes, the diameter of the steel pipe adopted by the transverse support (5) is not less than 200mm, the wall thickness is not less than 6mm, and the horizontal spacing is 1.0-2.0 m; the diameter of a steel pipe adopted by the inclined support (6) is not less than 200mm, the thickness is not less than 10mm, the inclination angle is 45 degrees, and the horizontal distance is 2.0-3.0 m; the concrete base (7) is a reinforced concrete strip foundation with the width of 1000mm and the height of 500 mm.
4. The weak stratum supporting and water-stopping double-layer steel sheet pile envelope structure as claimed in claim 1, wherein the gradient of the soil nailing wall (1) is 1:0.3 to 1: 0.5.
5. The weak stratum supporting and water-stopping double-layer steel plate pile envelope structure as claimed in claim 1, wherein an upper end platform (11) and a lower end platform (12) are respectively arranged at the upper end and the lower end of the soil nailing wall (1).
6. The weak stratum supporting and water-stopping double-layer steel plate pile envelope structure as claimed in claim 1, wherein the soil nails (2) are made of steel bars with the diameter of 15-25mm, the upper row and the lower row are arranged, the distance between the two rows is 1.0-1.5m, the distance between the adjacent soil nails (2) in each row is 1.2-1.8m, and the length of the soil nails (2) is 7-9 m.
7. The weak stratum supporting and water-stopping double-layer steel plate pile enclosure structure as claimed in claim 1, wherein the outer side steel plate pile (3) and the inner side steel plate pile (10) are not smaller than Larsen IV type steel plate piles, the distance between the two rows of steel plate piles is 0.8-3.0 m, and the embedding depth meets the requirement that the safety coefficient of the overall stability of the standard overturn resistance is not smaller than 1.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020339423.7U CN212612499U (en) | 2020-03-18 | 2020-03-18 | Supporting and water-stopping double-layer steel sheet pile enclosure structure for weak stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020339423.7U CN212612499U (en) | 2020-03-18 | 2020-03-18 | Supporting and water-stopping double-layer steel sheet pile enclosure structure for weak stratum |
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| Publication Number | Publication Date |
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| CN212612499U true CN212612499U (en) | 2021-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020339423.7U Active CN212612499U (en) | 2020-03-18 | 2020-03-18 | Supporting and water-stopping double-layer steel sheet pile enclosure structure for weak stratum |
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| CN (1) | CN212612499U (en) |
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