CN213978992U - Supporting construction of shallow foundation ditch in deep soft soil layer - Google Patents
Supporting construction of shallow foundation ditch in deep soft soil layer Download PDFInfo
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- CN213978992U CN213978992U CN202022094662.3U CN202022094662U CN213978992U CN 213978992 U CN213978992 U CN 213978992U CN 202022094662 U CN202022094662 U CN 202022094662U CN 213978992 U CN213978992 U CN 213978992U
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Abstract
The utility model relates to a supporting structure of deep soft soil layer shallow foundation pit, it includes gravity type cement soil wall and mixing pile, the soft soil layer is from the top down for artificial fill layer, silt layer and clay layer in proper order, a plurality of groups of steel-pipe piles are embedded in the gravity type cement soil wall, embedded steel bar between each adjacent steel-pipe pile, a plurality of groups of prestressed pipe piles are embedded in the gravity type cement soil wall far away from the soft soil layer, the mixing pile is lower than the gravity type cement soil wall, the upper end face of mixing pile forms the basement for basement construction; the depth of the gravity type cement soil wall extends to the depth of the lower layer of the sludge layer. The setting up of each group of reinforcing bar of this application, steel-pipe pile and stress tube stake makes the structural strength of gravity type cement soil wall promote greatly, and gravity type cement soil wall promotes soft soil layer's supporting role, and soft soil layer is difficult for taking place to collapse, and to the shallow pit supporting structure of commonly used now, the shoring of shallow foundation ditch side slope is guaranteed when the construction, and the whole cost of engineering reduces simultaneously.
Description
Technical Field
The application relates to the field of complex geology foundation pit support, in particular to a supporting structure of a deep soft soil layer shallow foundation pit.
Background
The Zhu delta plain zone contains a large-area deep silt soft soil layer which develops in the fourth period, is one of the most representative soft soil engineering geology in China, particularly the south sand area, the underground soft soil distribution surface in the area is wide, the basement is influenced by geological environment, cost and manufacturing cost, the basement is most common in one layer, and the design of a foundation pit mainly adopts a shallow foundation pit.
The natural water content of the sludge soil is large, the porosity is large, the compression coefficient is high, and the pore water pressure is easy to increase rapidly due to soil disturbance. On the other hand, the thick silt in the southern sand area is not uniform in soft soil layer thickness, and is often accompanied by oyster shell silt interlayers, so that the construction quality defect is caused by the fact that a supporting layer is easily mistaken during piling construction. The soft soil engineering in the area has complex geology and large construction difficulty. If only the measures of a relatively economic cement soil gravity retaining type cement soil wall, tubular pile supporting, natural slope laying and the like are adopted, the phenomena of instability, damage and the like of a supporting structure are easy to occur, but if the supporting forms of cast-in-place piles, anchor rods and the like with high rigidity are adopted, deep soft soil layers need to be penetrated, and the cost of shallow foundation pit supporting is greatly increased.
With respect to the related art in the above, the inventors consider that there are the following drawbacks: the common shallow foundation pit and shallow supporting structure in the deep soft soil layer is easy to have local instability damage, and the supporting structure with stronger rigidity needs to pass through the deep weak soil layer to generate the engineering problem with higher engineering cost, so that the shallow foundation pit construction of deep silt soft soil layer geology faces a larger problem, and an improved space exists.
SUMMERY OF THE UTILITY MODEL
In order to solve local unstability destruction when excavating shallow foundation ditch to deep silt soft soil layer, reduce the cost of work progress, this application provides a supporting construction of deep soft soil layer shallow foundation ditch.
The application provides a supporting construction of shallow foundation ditch in deep soft soil layer adopts following technical scheme:
a supporting structure of a deep soft soil layer shallow foundation pit comprises a gravity type cement soil wall and stirring piles, wherein a soft soil layer is sequentially composed of an artificial fill layer, a silt layer and a clay layer from top to bottom, a plurality of groups of vertically extending steel pipe piles are embedded in one side, close to the soft soil layer, of the gravity type cement soil wall, vertically extending reinforcing steel bars are embedded between every two adjacent steel pipe piles, a plurality of groups of vertically extending prestressed pipe piles are embedded in one side, far away from the soft soil layer, of the gravity type cement soil wall, the stirring piles are located on one side, far away from the soft soil layer, of the gravity type cement soil wall, the stirring piles are lower than the gravity type cement soil wall, and the upper end surfaces of the stirring piles form a base for basement construction; the depth of the gravity type cement soil wall extends to the depth of the lower layer of the sludge layer.
By adopting the technical scheme, when the construction of a shallow foundation pit is carried out on a deep and thick silt soft soil layer, the construction of a gravity type cement soil wall and a stirring pile is carried out, a plurality of groups of steel pipe piles and reinforcing steel bars are embedded in the gravity type cement soil wall, each group of steel pipe piles and reinforcing steel bars vertically extend to the interior of the gravity type cement soil wall, and the steel pipe piles and the reinforcing steel bars reinforce the gravity type cement soil wall, so that the structural strength of the gravity type cement soil wall is improved; each group of prestressed pipe piles is embedded and fixed inside a gravity type cement soil wall, the lower end parts of the prestressed pipe piles are inserted into a silt layer, so that the prestressed pipe piles reinforce the gravity type cement soil wall, a base formed between a stirring pile and the gravity type cement soil wall is convenient for later construction of a basement, the above cooperation ensures that the gravity type cement soil wall supports the side slope of a shallow foundation pit during construction of a shallow foundation pit of a deep silt soft soil layer, the arrangement of each group of reinforcing steel bars, steel pipe piles and prestressed pipe piles greatly improves the structural strength of the gravity type cement soil wall, the supporting effect of the gravity type cement soil wall on the soft soil layer is improved, the soft soil layer is not easy to collapse, the support structure of the side slope during construction of the shallow foundation pit is ensured for a common shallow foundation pit support structure, the overall construction cost of the engineering is reduced, the economical efficiency of the construction process is improved, and the anti-overturning capability and the safety coefficient of the side slope support structure are improved, thereby ensuring the safety and reliability of shallow foundation pit construction.
Preferably, the upper end surface of the gravity type cement-soil wall is lower than the surface of the artificial filling layer, and the artificial filling layer extends towards one side of the gravity type cement-soil wall in an inclined mode.
By adopting the technical scheme, the upper end surface of the gravity type cement soil wall is lower than the surface of the artificial filling layer, the artificial filling layer extends towards one side of the gravity type cement soil wall in an inclined mode, the artificial filling layer covers the sludge layer, the bearing capacity of the ground at the position of the sludge layer is improved, and the construction machinery is not easy to sink when moving.
Preferably, the embedding depth of the lower end part of the steel pipe pile is not less than two meters below the plane where the substrate is located vertically.
By adopting the technical scheme, the steel pipe pile is positioned inside the gravity type cement soil wall, the embedding depth of the lower end part of the steel pipe pile is not lower than the depth of two meters below the plane where the substrate is vertically positioned, the structural strength of the gravity type cement soil wall is improved by the arrangement of the steel pipe pile, when the side slope of the shallow foundation pit has the tendency of collapse, the gravity type cement soil wall generates shear stress on the stirring pile by the arrangement of the steel pipe pile, and the supporting capacity of the gravity type cement soil wall on the side slope is improved.
Preferably, a fine sand concrete layer is formed between the artificial fill layer and the gravity type cement-soil wall through spraying.
By adopting the technical scheme, the fine sand concrete layer covers the part between the artificial fill layer and the gravity type cement soil wall, so that the smoothness of the ground is improved, the water and soil loss is reduced, and the beautifying effect on the ground is achieved.
Preferably, a reinforcing mesh is embedded in the fine sand concrete layer, and a water tank is arranged on the plane where the reinforcing mesh is located in a downward concave mode.
Through adopting above-mentioned technical scheme, the setting up of reinforcing bar net has promoted fine sand concrete layer's structural strength, makes fine sand concrete layer's bearing capacity promote, and the setting up of basin is convenient for carry out the drainage operation on ground.
Preferably, a plurality of groups of dowel bars are embedded in the fine sand concrete layer at the inclined position extending towards the gravity type cement-soil wall, and each dowel bar is arranged in an inclined manner.
By adopting the technical scheme, the groups of the inserted bars are embedded and fixed at the inclined positions of the fine sand concrete layer, and the groups of the inserted bars reinforce the fine sand concrete layer, so that the stability of the artificial filling layer higher than the gravity type cement soil wall part is improved, and the artificial filling layer is not easy to collapse.
Preferably, a cover plate is constructed on the upper end face of the gravity type cement-soil wall, and the lower end face of the cover plate covers the reinforcing steel bars, the steel pipe piles and the prestressed pipe piles.
By adopting the technical scheme, the cover plate covers the upper end face of the gravity type cement-soil wall, the cover plate is made of reinforced concrete, and the bearing capacity of the upper end face of the gravity type cement-soil wall is improved by the cover plate.
Preferably, a plurality of groups of vertically extending reinforcing ribs are embedded in one side, away from the gravity type cement-soil wall, of the mixing pile, a bottom plate of a basement is poured on the upper end face of the mixing pile, a side wall is poured on one side, close to the gravity type cement-soil wall, of the bottom plate, and the upper end portions of the reinforcing ribs are embedded in the side wall.
Through adopting above-mentioned technical scheme, the strengthening rib is vertical to be inlayed admittedly inside the stirring stake, and the up end of the vertical upper end protrusion stirring stake of strengthening rib carries out later stage basement's work progress, and the strengthening rib stretches into and inserts the basement bottom plate, and the upper end of strengthening rib inlays admittedly in the lateral wall of basement, makes the strengthening rib connect the basement, and the stirring stake supports the basement, makes the stability of basement promote.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the gravity type cement soil wall and the stirring pile support the shallow foundation pit side slope, the gravity type cement soil wall is reinforced by the groups of reinforcing steel bars, the steel pipe piles and the prestressed pipe piles which are embedded in the gravity type cement soil wall, the structural strength of the gravity type cement soil wall is improved, the stirring pile further supports the gravity type cement soil wall, the basement is built above the stirring pile, the stability of the basement is improved due to the arrangement of the stirring pile, the probability of collapse of the shallow foundation pit side slope is reduced due to the cooperation, the construction cost of the shallow foundation pit is reduced, the anti-overturning capacity and the safety coefficient of the side slope supporting structure are improved, and the safety and reliability of the shallow foundation pit construction are guaranteed;
2. the fine sand concrete layer covers the part between the artificial fill layer and the gravity type cement soil wall, so that the smoothness of the ground is improved, the water and soil loss is reduced, and the beautifying effect on the ground is achieved; the arrangement of the reinforcing mesh and the inserting bars improves the stability of the part of the artificial filling layer higher than the gravity type cement soil wall, and the artificial filling layer is not easy to collapse;
3. the cover plate covers the upper end face of the gravity type cement-soil wall, the cover plate is made of reinforced concrete, and the bearing capacity of the upper end face of the gravity type cement-soil wall is improved due to the arrangement of the cover plate.
Drawings
FIG. 1 is a schematic cross-sectional view of a composite construction of an embodiment of the present application;
FIG. 2 is a composite construction elevation schematic of an embodiment of the present application.
Description of reference numerals: 1. artificial soil filling; 2. a sludge layer; 3. a clay layer; 4. a fine sand concrete layer; 41. a reinforcing mesh; 42. inserting ribs; 43. a water tank; 5. a gravity cement-soil wall; 51. reinforcing steel bars; 52. steel pipe piles; 53. a steel floral tube; 54. pre-stressing pipe piles; 55. a cover plate; 6. stirring the piles; 61. reinforcing ribs; 7. a base plate; 71. a side wall; 8. a substrate; 9. and (5) side lines of the foundation pit.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses supporting construction of deep soft soil layer shallow foundation ditch. Referring to fig. 1 and 2, the soft soil layer on the ground comprises an upper artificial filling layer 1, a middle silt layer 2 and a lower silty clay layer 3, the depth of the silt layer 2 reaches 21.57m and the depth of the lower silty clay reaches 4.7m according to geological survey data, the upper silt layer 2 is dug for 2.87m during construction, and soil is artificially backfilled to form the artificial filling layer 1.
Piling and guniting on the ground to form a gravity type cement soil wall 5, wherein the upper end surface of the gravity type cement soil wall 5 is 1.2m lower than the upper end surface of the artificial soil filling layer 1, the gravity type cement soil wall 5 vertically extends downwards, the vertical depth of the gravity type cement soil wall 5 reaches 12.3m, the width of the gravity type cement soil wall 5 is 3.4m, the vertical lower end of the gravity type cement soil wall 5 extends into the lower layer depth of the silt layer 2, and the distance between the lower end of the gravity type cement soil wall 5 and the clay layer 3 is 3.1 m. The gravity type cement soil wall 5 is a plurality of groups of cement mixing piles 6, the diameter of each group of cement mixing piles 6 is 800mm, and the distance between every two adjacent groups of cement mixing piles 6 is 650 mm. A plurality of groups of steel bars 51 are embedded in the gravity type cement-soil wall 5, each group of steel bars 51 vertically extends, and the diameter of each steel bar 51 is 16 mm; the inside vertical a plurality of groups of steel-pipe pile 52 of consolidating of gravity type cement soil wall 5 near soft soil layer one side, each group of steel-pipe pile 52 and reinforcing bar 51 your up end and the up end coplane of gravity type cement soil wall 5, each length of group of steel-pipe pile 52 reaches 5m, each group of reinforcing bar 51 and each group of steel-pipe pile 52 cross distribution, each group of steel-pipe pile 52's diameter is 121mm, and the wall thickness of pipe is 6 mm.
A plurality of groups of prestressed pipe piles 54 are vertically embedded at one side of the gravity type cement soil wall 5 far away from the soft soil layer, the diameter of each prestressed pipe pile 54 is 500mm, the pipe length is 16.5m, and the vertical lower end part of each prestressed pipe pile 54 is inserted into the clay layer 3 to be 1.09m in size. The distance between two adjacent groups of prestressed pipe piles 54, two adjacent groups of steel bars 51 and two adjacent groups of steel pipe piles 52 is 1.3 m. The reinforcing steel bars 51 are distributed in five rows, and the distance between the reinforcing steel bars 51 in two adjacent rows is 0.65 m. A plurality of groups of steel perforated pipes 53 are vertically embedded in the gravity type cement soil wall 5 on one side of the prestressed pipe piles 54, the diameter of each steel perforated pipe 53 is 60mm, the thickness of the pipe wall is 2mm, the length of each group of steel perforated pipes 53 reaches 5m, and each group of steel perforated pipes 53 are abutted with the outer peripheral surface of each adjacent group of prestressed pipe piles 54.
The upper end face of gravity type soil cement wall 5 covers has apron 55, and apron 55 is the reinforced concrete material, and apron 55 thickness 150mm, and apron 55 contrast each group reinforcing bar 51, steel-pipe pile 52 and prestressed pipe pile 54 cover, and the upper end face of gravity type soil cement wall 5 and the lower terminal surface butt of apron 55.
The artificial filling layer 1 is in inclined transition to the gravity type cement soil wall 5, the gradient of the inclined position is 45 degrees, the upper end face of the artificial filling layer 1 is sprayed and constructed with a fine sand concrete layer 4 with the thickness of 100mm, a reinforcing mesh 41 is embedded in the fine sand concrete layer 4, and the reinforcing mesh 41 is made of reinforcing steel bars with the diameter of 8mm and the distance of 200 mm. A plurality of groups of the dowel bars 42 are embedded in the inclined position of the fine sand concrete layer 4, the extending direction of the dowel bars 42 is perpendicular to the plane where the inclined position is located, the diameter of each dowel bar 42 is 16mm, the length is preferably 2m, and the dowel bars 42 in each group are distributed at equal intervals according to 1.5 m. The upper end surface of the fine sand concrete layer 4 is concavely provided with a water tank 43.
The mixing pile 6 is positioned on one side of the gravity type cement soil wall 5 far away from the soft soil layer, the upper end face of the mixing pile 6 is 5m lower than the upper end face of the gravity type cement soil wall 5, the width of the mixing pile 6 is 1.75m, and the depth of the mixing pile 6 reaches 5 m. The diameter of the mixing piles 6 is 550mm, and the distance between two adjacent groups of mixing piles 6 is 400 mm. The upper end face of the mixing pile 6 is a base 8, and one side of the mixing pile 6 close to the gravity type cement-soil wall 5 is a foundation pit sideline 9. The mixing pile 6 is located on one side close to the prestressed pipe pile 54.
The stirring pile 6 is far away from the vertical extending strengthening rib 61 of a plurality of groups of one side of the gravity type cement soil wall 5, the diameter of the strengthening rib 61 is 16mm, the length of the strengthening rib 61 is 2m, and the depth of the strengthening rib 61 embedded into the stirring pile 6 is 1 m. The upper end of each group of reinforcing ribs 61 protrudes out of the upper end face of the stirring pile 6, the bottom plate 7 of the basement is poured on the side, away from the gravity type cement soil wall 5, of the stirring pile 6, the bottom plate 7 is horizontally arranged, and the lower end face of the bottom plate 7 and the upper end face of the stirring pile 6 are integrally formed. The upper ends of the reinforcing ribs 61 penetrate through the bottom plate 7, the side wall 71 is cast on one side, close to the gravity type cement-soil wall 5, of the upper end face of the bottom plate 7, and the vertical upper end portions of the reinforcing ribs 61 are embedded in the side wall 71. A gap with a certain size is formed between the side wall 71 and the gravity type cement soil wall 5, and the size of the gap reaches 1.2 m.
The implementation principle of the supporting structure of the deep soft soil layer shallow foundation pit of the embodiment of the application is as follows:
this kind of supporting construction of deep soft soil layer shallow foundation ditch carries out survey and drawing, demarcation to the ground of pre-excavation shallow foundation ditch before carrying out the construction, gets rid of the top layer silt in soft soil layer region and backfills the grit. And constructing the fine sand concrete layer 4, and embedding each group of the dowel bars 42, wherein each group of the dowel bars 42 is used for reinforcing the artificial fill layer 1.
A worker drives an RJP high-pressure jet grouting pile driver to perform grouting operation, soil mass at a pile position is stirred, each group of reinforcing steel bars 51, steel pipe piles 52, steel flower pipes 53 and prestressed pipe piles 54 are timely driven into the pile position before the mixed soil mass at the pile position is initially set, and after the gravity type cement-soil wall 5 is solidified, a cover plate 55 is installed on the upper end face of the gravity type cement-soil wall 5. For the construction of the mixing pile 6, the RJP high-pressure jet grouting pile machine is driven to perform grouting operation, the soil body at the pile position is stirred, each group of reinforcing ribs 61 are timely driven into the mixing pile before the initial setting of the mixing pile body at the pile position, the basement is poured after the mixing pile 6 is solidified, and the reinforcing ribs 61 penetrate through the bottom plate 7 and are embedded and fixed in the side wall 71. This kind of shallow foundation pit supporting construction of dark weak soil, support forms such as bored concrete pile, interior support, stock that present rigidity is stronger, it must pass through deep soft soil layer, and the supporting construction of this application has reduced the cost of shallow foundation pit support, has promoted the supporting role to the shallow foundation pit slope, and the slope is difficult for taking place the landslide, has improved the antidumping ability and the factor of safety of slope supporting construction to guarantee the safe and reliable of shallow foundation pit construction.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a supporting construction of shallow foundation ditch in deep soft soil layer, includes gravity type soil cement wall (5) and stirring stake (6), its characterized in that: the gravity type cement-soil wall is characterized in that a soft soil layer sequentially comprises an artificial soil filling layer (1), a silt layer (2) and a clay layer (3) from top to bottom, a plurality of groups of vertically extending steel pipe piles (52) are embedded in one side, close to the soft soil layer, of the gravity type cement-soil wall (5), vertically extending reinforcing steel bars (51) are embedded between every two adjacent steel pipe piles (52), a plurality of groups of vertically extending prestressed pipe piles (54) are embedded in one side, far away from the soft soil layer, of the gravity type cement-soil wall (5), the stirring piles (6) are located on one side, far away from the soft soil layer, of the gravity type cement-soil wall (5), the stirring piles (6) are lower than the gravity type cement-soil wall (5), and the upper end faces of the stirring piles (6) form a base (8) for basement construction; the depth of the gravity type cement soil wall (5) extends to the lower layer depth of the sludge layer (2).
2. The supporting structure of the deep soft soil layer shallow foundation pit according to claim 1, characterized in that: the upper end surface of the gravity type cement-soil wall (5) is lower than the surface of the artificial filling layer (1), and the artificial filling layer (1) extends towards one side of the gravity type cement-soil wall (5) in an inclined mode.
3. The supporting structure of the deep soft soil layer shallow foundation pit according to claim 1, characterized in that: the embedded depth of the lower end part of the steel pipe pile (52) is not less than the depth of two meters below the plane where the substrate (8) is vertically arranged.
4. The supporting structure of the deep soft soil layer shallow foundation pit according to claim 1, characterized in that: and a fine sand concrete layer (4) is formed between the artificial fill layer (1) and the gravity type cement soil wall (5) in a spraying mode.
5. The supporting structure of the deep soft soil layer shallow foundation pit according to claim 4, characterized in that: reinforcing meshes (41) are embedded in the fine sand concrete layer (4), and water grooves (43) are formed in the plane where the reinforcing meshes (41) are located and are concave downwards.
6. The supporting structure of the deep soft soil layer shallow foundation pit according to claim 5, characterized in that: and a plurality of groups of dowel bars (42) are embedded in the fine sand concrete layer (4) towards the inclined position where the gravity type cement-soil wall (5) extends, and each dowel bar (42) is obliquely arranged.
7. The supporting structure of the deep soft soil layer shallow foundation pit according to claim 1, characterized in that: and a cover plate (55) is constructed on the upper end surface of the gravity type cement-soil wall (5), and the lower end surface of the cover plate (55) covers the reinforcing steel bars (51), the steel pipe piles (52) and the prestressed pipe piles (54).
8. The supporting structure of the deep soft soil layer shallow foundation pit according to claim 1, characterized in that: a plurality of groups of reinforcing ribs (61) which vertically extend are embedded in one side, far away from the gravity type cement-soil wall (5), of the stirring pile (6), a bottom plate (7) of a basement is poured on the upper end face of the stirring pile (6), a side wall (71) is poured on one side, close to the gravity type cement-soil wall (5), of the bottom plate (7), and the upper end portions of the reinforcing ribs (61) are embedded and fixed in the side wall (71).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022094662.3U CN213978992U (en) | 2020-09-22 | 2020-09-22 | Supporting construction of shallow foundation ditch in deep soft soil layer |
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| CN202022094662.3U CN213978992U (en) | 2020-09-22 | 2020-09-22 | Supporting construction of shallow foundation ditch in deep soft soil layer |
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