CN212641473U - Foundation pit supporting structure adjacent to existing building - Google Patents
Foundation pit supporting structure adjacent to existing building Download PDFInfo
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- CN212641473U CN212641473U CN202021256167.1U CN202021256167U CN212641473U CN 212641473 U CN212641473 U CN 212641473U CN 202021256167 U CN202021256167 U CN 202021256167U CN 212641473 U CN212641473 U CN 212641473U
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Abstract
The utility model relates to a construction excavation supporting technical field discloses an excavation supporting construction of neighbouring existing building. The utility model comprises an enlarged foundation arranged adjacent to the existing foundation, a grouting reinforcement body positioned below the enlarged foundation, a jet grouting pile positioned on one side of the grouting reinforcement body far away from the existing foundation, and a cast-in-situ bored pile positioned on one side of the jet grouting pile far away from the existing foundation; the grouting reinforcement body comprises two rows of grouting holes which are horizontally arranged in parallel, namely an inner side grouting hole close to one side of the foundation pit and an outer side grouting hole close to one side of the existing foundation, the inner side grouting hole and the outer side grouting hole are arranged in a staggered mode in the front-back direction, and grout is injected into the two rows of grouting holes; and at least one transverse waist beam is arranged on one side of the cast-in-situ bored pile, which is close to the foundation pit, and an anchor cable of an inclined strut is arranged on the waist beam. The utility model discloses strut intensity well, it is little to the disturbance of the below soil property of existing building.
Description
Technical Field
The utility model relates to a construction excavation supporting technical field especially relates to an excavation supporting construction of neighbouring existing building.
Background
The foundation pit engineering mainly comprises foundation pit supporting system design and construction and earthwork excavation, and is a system engineering with strong comprehensiveness. It requires close cooperation between geotechnical engineering and structural engineering technicians. The deep foundation pit refers to a project with excavation depth of more than 5m (including 5 m) or with excavation depth of less than 5m, but with complicated geological conditions, surrounding environment and underground pipelines.
With the continuous and rapid development of the real estate industry in China, more and more new projects are adjacent to old cells. The construction of the foundation pit adjacent to the old community needs to consider not only the safety of the construction, but also the safety of the adjacent community and personal and property. The construction of the deep foundation pit adjacent to the existing building conventionally adopts support forms such as a steel sheet pile, an underground continuous wall, a cement mixing pile and the like, wherein the support forms of the underground continuous wall, the cement mixing pile and the like have high cost and slow construction progress; although the steel sheet pile support is easy to construct, the pressure resistance is weak. Therefore, when constructing a foundation pit adjacent to an old community, how to improve the supporting strength of a supporting pile structure and reduce disturbance to soil quality below the adjacent old community as much as possible on the premise of ensuring the construction progress is a technical difficulty that technical personnel need to be official attention.
SUMMERY OF THE UTILITY MODEL
The utility model provides a strut intensity well, efficient, to the little adjacent existing building's of the below soil property disturbance foundation ditch supporting construction of existing building.
The technical problem to be solved is that: the existing supporting mode is high in construction difficulty and low in efficiency, disturbance to adjacent strata is large, and certain safety risk exists.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the utility model discloses a foundation pit supporting structure adjacent to an existing building, which comprises an enlarged foundation arranged adjacent to the existing foundation, a grouting reinforcement body positioned below the enlarged foundation, a jet grouting pile positioned on one side of the grouting reinforcement body far away from the existing foundation, and a cast-in-situ bored pile positioned on one side of the jet grouting pile far away from the existing foundation; connecting planting bars are arranged on one side of the existing foundation, which is close to the foundation pit to be constructed, the enlarged foundation is of a reinforced concrete structure, and an internal newly-added reinforcement cage is fixedly connected with the connecting planting bars; the grouting reinforcement body comprises two rows of grouting holes which are horizontally arranged in parallel, namely an inner side grouting hole close to one side of the foundation pit and an outer side grouting hole close to one side of the existing foundation, the inner side grouting hole and the outer side grouting hole are arranged in a staggered mode in the front-back direction, and grout is injected into the two rows of grouting holes; the cast-in-situ bored piles are arranged at equal intervals, the tops of the cast-in-situ bored piles are connected through crown beams, at least one transverse waist beam is arranged on one side, close to a foundation pit, of each cast-in-situ bored pile, an anchor cable of an inclined strut is arranged on each waist beam, the top end of each anchor cable penetrates through each waist beam and is fixed, and the bottom end of each anchor cable is obliquely downwards penetrates through a gap between every two adjacent cast-in-situ bored piles and is fixed in a soil layer below an.
The utility model discloses neighbouring existing building's underground structure, it is further, connect the bar planting and set up along the surface interval on existing basis.
The utility model discloses neighbouring existing building's foundation ditch supporting construction, it is further, form the slip casting reinforcing body near the injected hole after the thick liquid diffusion, the side facade that the slip casting reinforcing body is close to foundation ditch one side is not more than the outside border setting of expanding the basis, and the side facade that is close to existing basis one side aligns the setting from top to bottom with the outside border of existing basis.
The utility model discloses the adjacent existing building's underground structure, it is further, the even interval in slip casting hole sets up, and distance between the central point in adjacent slip casting hole is 450 supplyes powder 600mm in every row of slip casting hole, and distance between inboard slip casting hole and the outside slip casting hole is not more than 800 mm.
The utility model discloses neighbouring existing building's underground structure, it is further, the stake of spouting soon includes two rows of high pressure spouts stake soon that set up side by side with the slip casting reinforcement level, is the interior row of spouting soon that is close to foundation ditch one side respectively and the outer row of spouting soon that the lamination slip casting reinforcement set up spouts the stake, and adjacent spout soon the stake overlap joint setting, interior row spout soon stake and outer row spout soon crisscross setting around the stake.
The utility model discloses neighbouring existing building's foundation ditch supporting construction, it is further, arrange outward that jet grouting pile bottom downwardly exceeds existing foundation bottom surface 6m at least, interior row jet grouting pile bottom downwardly exceeds existing foundation bottom surface 12m at least.
The utility model discloses neighbouring existing building's underground structure, it is further, anchor rope top-down is provided with three rows, and the top is located 3m, 6m, 9m department below the crown beam top elevation respectively.
The utility model discloses neighbouring existing building's excavation supporting construction, it is further, the waist rail includes a pair of I-steel of arranging side by side, and two relative flange boards coplane of I-steel set up and connect through the connecting plate, leave the gap that supplies the anchor rope to pass between two I-steels, and the flange board face of anchor rope perpendicular to I-steel sets up.
The utility model discloses neighbouring existing building's excavation supporting construction, it is further, be provided with the stiffening plate between the anchor head of anchor rope and the flange board of I-steel, the stiffening plate is fixed with the flange board face welded of I-steel.
The utility model discloses neighbouring existing building's underground structure, it is further, it is equipped with the bolster to inlay between waist roof beam and the bored concrete pile, and the bolster is right angled triangle's lath for the longitudinal section, and the cooperation card is established between waist roof beam and bored concrete pile, and is decided with the waist roof beam welding.
The utility model discloses the underground structure of neighbouring existing building compares with prior art, has following beneficial effect:
the utility model discloses a method that neighbouring old district was consolidated carries out the basis reinforcement to these old districts and consolidates: firstly, the bar foundation of the old house is embedded with steel bars and thickened and expanded, and the foundation treatment of high-pressure jet grouting piles and grouting hole grouting is carried out below the externally expanded foundation. By the construction method, the water and soil loss and large-area block dropping of the foundation soil of the adjacent old community caused by rotary drilling in the foundation pit supporting construction process are prevented, and the house of the adjacent old community is guaranteed not to be affected as much as possible in the foundation pit excavation process.
A supporting system of supporting piles and anchor cables between a foundation pit and an adjacent old community is adopted, so that the disturbance of the ground stress change caused by earth excavation on the foundation soil of the existing building base is reduced, and the old house is guaranteed not to be influenced.
The following will further explain the supporting structure of the foundation pit adjacent to the existing building with reference to the attached drawings.
Drawings
Fig. 1 is a schematic structural view of a foundation pit supporting structure adjacent to an existing building;
FIG. 2 is a schematic diagram of a detail at an enlarged base;
FIG. 3 is a schematic view of the structure of section A-A in FIG. 1;
FIG. 4 is a schematic view of a connection structure of an end portion of an anchor cable;
fig. 5 is a schematic structural view of a wale.
Reference numerals:
1-existing basis; 2-expanding the basis; 21-newly adding a reinforcement cage; 22-connecting and planting bars; 3-grouting and reinforcing bodies; 31-inner grouting holes; 32-outer grouting holes; 41-inner row jet grouting piles; 42-outer-row jet grouting piles; 5-drilling a cast-in-place pile; 6, anchor cables; 7-a crown beam; 8-waist rail; 91-a connecting plate; 92-a stiffening plate; 93-pad seat.
Detailed Description
As shown in fig. 1 to 3, the utility model discloses neighbouring existing building's foundation ditch supporting construction includes neighbouring existing foundation 1 and sets up enlarges basic 2, is located the slip casting reinforcement body 3 that enlarges basic 2 below, is located slip casting reinforcement body 3 and keeps away from the jet grouting pile that existing foundation 1 one side set up to and be located the jet grouting pile and keep away from the bored concrete pile 5 that existing foundation 1 one side set up.
The grouting reinforcement body 3 comprises two rows of grouting holes horizontally arranged in parallel, namely an inner side grouting hole 31 close to one side of the foundation pit and an outer side grouting hole 32 close to one side of the existing foundation 1, the grouting holes are uniformly arranged at intervals, the distance between the central points of the adjacent grouting holes in each row of grouting holes is 450-inch thick 600mm, the inner side grouting hole 31 and the outer side grouting hole 32 are arranged in a front-back staggered mode, and the distance between the inner side grouting hole 31 and the outer side grouting hole 32 is not more than 800 mm. Grout is injected into the two rows of grouting holes, grouting reinforcement bodies 3 are formed near the grouting holes after the grout is diffused, the side elevation of one side, close to the foundation pit, of each grouting reinforcement body 3 is not beyond the outer side edge of the enlarged foundation 2, the side elevation of one side, close to the existing foundation 1, of each grouting reinforcement body is vertically aligned with the outer side edge of the existing foundation 1, the grouting reinforcement bodies are close to the existing foundation 1 of the old community and are not in contact with the existing foundation 1, and disturbance on the underground soil layer of the old community can be avoided to the greatest extent.
The jet grouting piles comprise two rows of high-pressure jet grouting piles horizontally arranged in parallel with the grouting reinforcement body 3, namely inner row jet grouting piles 41 close to one side of the foundation pit and outer row jet grouting piles 42 attached to the grouting reinforcement body 3; the diameter of each rotary spraying pile is 700-800mm, the central distance between every two adjacent rotary spraying piles in a single row is not more than 500mm, and the adjacent rotary spraying piles are in lap joint; the bottom end of the outer row of jet grouting piles 42 downwards exceeds the bottom surface of the existing foundation 1 by at least 6m, the bottom end of the inner row of jet grouting piles 41 downwards exceeds the bottom surface of the existing foundation 1 by at least 12m, the inner row of jet grouting piles 41 and the outer row of jet grouting piles 42 are arranged in a staggered mode front and back, the water cement ratio of cement paste poured into the jet grouting piles is 0.9-1.1, and the cement mixing amount is 25-30% of the mass of the used soil.
The cast-in-situ bored piles 5 are uniformly arranged at intervals, the distance between every two adjacent cast-in-situ bored piles 5 is not more than 1.6m, the tops of the cast-in-situ bored piles are connected through crown beams 7, at least one transverse waist beam 8 is arranged on one side, close to a foundation pit, of each cast-in-situ bored pile 5, an anchor cable 6 of an inclined strut is arranged on each waist beam 8, the top end of each anchor cable 6 penetrates through each waist beam 8 and is fixed, the bottom end of each anchor cable obliquely downwards penetrates through a gap between every two adjacent cast-in-situ bored piles 5 and is fixed in a soil layer below an existing foundation 1 after being sprayed with a jet grouting.
Preferably, the anchor cables 6 are arranged in three rows from top to bottom, and the top ends of the anchor cables are respectively positioned at the positions 3m, 6m and 9m below the top standard height of the crown beam 7.
As shown in fig. 4 and 5, the waist rail 8 includes a pair of i-beams arranged in parallel, the two opposing flange plates of the i-beams are coplanar and connected by a connecting plate 91, a gap for the anchor cable 6 to pass through is left between the two i-beams, the connecting plate 91 is a rectangular steel plate strip with a thickness of not less than 20mm, two ends of the rectangular steel plate strip are welded and fixed with the flange plate surfaces of the i-beams on two sides respectively, the i-beams on two sides are connected into an integral structure, the anchor cable 6 is arranged perpendicular to the flange plate surfaces of the i-beams, a stiffening plate 92 is arranged between the anchor head of the anchor cable 6 and the flange plate of the i-beams, and the stiffening plate 92 is welded and fixed with the flange plate surfaces of the i; inlay between waist rail 8 and bored concrete pile 5 and be equipped with pad seat 93, pad seat 93 is that longitudinal section is right triangle's lath, and the cooperation card is established between waist rail 8 and bored concrete pile 5, and is decided with waist rail 8 welding, ensures the stability of the waist rail 8 that the slope set up.
In order to prevent the influence of hole collapse or influence on the quality of a pile body of an adjacent pile or influence of settlement cracks of old buildings in a residential area caused by too short construction distance or too short interval time of two adjacent piles during the construction of the cast-in-situ bored piles 5, batch jumping construction is adopted, the cast-in-situ bored piles 5 are constructed according to the interval hole during the construction, namely a 'three-one' jumping pile digging method, 3 batches of construction are arranged, the 1 st batch of cast-in-situ bored piles 5 are constructed firstly, then the 2 nd batch of cast-in-situ bored piles 5 are constructed, and finally the 3 rd batch of cast-in-situ bored piles 5 are constructed, and when the concrete strength of the 1 batch of cast-in-situ bored piles 5 is not less than 50% of the designed strength after the cast-in-situ bored piles are cast in concrete, the 2 batches of cast-in-situ bored piles 5 can be constructed, so that the influence of the construction on the.
The utility model discloses neighbouring existing building's foundation ditch supporting construction's construction method, including following step:
firstly, arranging an outer side grouting hole 32 and an inner side grouting hole 31 in a soil layer close to the outer side edge of the existing foundation 1;
step two, grouting into the grouting holes, diffusing the grouting liquid to form a grouting reinforcement body 3 which is close to the existing foundation 1 and is combined with the existing foundation 1, wherein the width of the grouting reinforcement body 3 is larger than the hole distance between two rows of grouting holes,
thirdly, arranging a jet grouting pile outside the grouting reinforcement body 3, and forming an isolation curtain pile together with the grouting reinforcement body 3;
fourthly, arranging an enlarged foundation 2 on one side of the existing foundation 1 close to the foundation pit to be constructed;
and step five, arranging a bored pile 5 and an anchor cable 6 on one side of the jet grouting pile, which is far away from the existing foundation 1, by a 'three-in-one' jump pile digging method.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (10)
1. Neighbouring existing building's foundation ditch supporting construction, its characterized in that: the grouting reinforcement structure comprises an enlarged foundation (2) arranged adjacent to an existing foundation (1), a grouting reinforcement body (3) positioned below the enlarged foundation (2), a jet grouting pile arranged on one side, far away from the existing foundation (1), of the grouting reinforcement body (3), and a cast-in-situ bored pile (5) arranged on one side, far away from the existing foundation (1), of the jet grouting pile; one side of the existing foundation (1) close to the foundation pit to be constructed is provided with a connecting embedded bar (22), the enlarged foundation (2) is of a reinforced concrete structure, and an internal newly-added reinforcement cage (21) is fixedly connected with the connecting embedded bar (22); the grouting reinforcement body (3) comprises two rows of grouting holes which are horizontally arranged in parallel, namely an inner side grouting hole (31) close to one side of the foundation pit and an outer side grouting hole (32) close to one side of the existing foundation (1), the inner side grouting hole (31) and the outer side grouting hole (32) are arranged in a staggered mode from front to back, and grout is injected into the two rows of grouting holes; the cast-in-situ bored piles (5) are arranged at even intervals, the tops of the cast-in-situ bored piles are connected through crown beams (7), at least one transverse-arranged waist beam (8) is arranged on one side, close to a foundation pit, of each cast-in-situ bored pile (5), anchor cables (6) of inclined struts are arranged on each waist beam (8), the top ends of the anchor cables (6) penetrate through the waist beams (8) and are fixed, and the bottom ends of the anchor cables are obliquely and downwards penetrate through gaps between adjacent cast-in-situ bored piles (5) and are fixed in soil layers below an existing foundation (1) after being.
2. A foundation pit supporting construction adjacent an existing building as claimed in claim 1, wherein: the connecting planting bars (22) are arranged along the outer surface of the existing foundation (1) at intervals.
3. A foundation pit supporting construction adjacent an existing building as claimed in claim 1, wherein: and after the slurry in the grouting hole is diffused, a grouting reinforcement body (3) is formed near the grouting hole, the side elevation of the grouting reinforcement body (3) close to one side of the foundation pit is not beyond the outer side edge of the enlarged foundation (2), and the side elevation close to one side of the existing foundation (1) and the outer side edge of the existing foundation (1) are aligned up and down.
4. A foundation pit supporting construction adjacent an existing building as claimed in claim 1, wherein: the grouting holes are uniformly arranged at intervals, the distance between the center points of adjacent grouting holes in each row of grouting holes is 450 mm and 600mm, and the distance between the inner side grouting hole (31) and the outer side grouting hole (32) is not more than 800 mm.
5. A foundation pit supporting construction adjacent an existing building as claimed in claim 1, wherein: the jet grouting pile comprises two rows of high-pressure jet grouting piles horizontally arranged in parallel with the grouting reinforcement body (3), wherein the high-pressure jet grouting piles are respectively an inner row of jet grouting piles (41) close to one side of a foundation pit and an outer row of jet grouting piles (42) arranged on the laminating grouting reinforcement body (3), the adjacent jet grouting piles are arranged in a lap joint mode, and the inner row of jet grouting piles (41) and the outer row of jet grouting piles (42) are arranged in a staggered mode from front to back.
6. A foundation pit supporting construction adjacent an existing building as claimed in claim 5, wherein: the bottom end of the outer row of jet grouting piles (42) downwards exceeds the bottom surface of the existing foundation (1) by at least 6m, and the bottom end of the inner row of jet grouting piles (41) downwards exceeds the bottom surface of the existing foundation (1) by at least 12 m.
7. A foundation pit supporting construction adjacent an existing building as claimed in claim 1, wherein: the anchor cables (6) are arranged in three rows from top to bottom, and the top ends of the anchor cables are respectively positioned at the positions 3m, 6m and 9m below the top standard height of the crown beam (7).
8. A foundation pit supporting construction adjacent an existing building as claimed in claim 1, wherein: waist rail (8) include a pair of I-steel of arranging side by side, and the relative flange board coplane of two I-steels sets up and connects through connecting plate (91), leaves the gap that supplies anchor rope (6) to pass between two I-steels, and anchor rope (6) perpendicular to I-steel's flange board face sets up.
9. A foundation pit supporting construction adjacent an existing building as claimed in claim 8, wherein: and a stiffening plate (92) is arranged between the anchor head of the anchor cable (6) and the flange plate of the I-shaped steel, and the stiffening plate (92) is welded and fixed with the flange plate surface of the I-shaped steel.
10. A foundation pit supporting construction adjacent an existing building as claimed in claim 8, wherein: inlay between waist rail (8) and drilling bored concrete pile (5) and be equipped with pad seat (93), pad seat (93) are vertical section and are right triangle's lath, and the cooperation card is established between waist rail (8) and drilling bored concrete pile (5), and is fixed with waist rail (8) welding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021256167.1U CN212641473U (en) | 2020-07-01 | 2020-07-01 | Foundation pit supporting structure adjacent to existing building |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021256167.1U CN212641473U (en) | 2020-07-01 | 2020-07-01 | Foundation pit supporting structure adjacent to existing building |
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| CN212641473U true CN212641473U (en) | 2021-03-02 |
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| CN202021256167.1U Active CN212641473U (en) | 2020-07-01 | 2020-07-01 | Foundation pit supporting structure adjacent to existing building |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113235613A (en) * | 2021-05-24 | 2021-08-10 | 中国铁路设计集团有限公司 | Newly-built foundation pit excavation supporting method using adjacent existing fender post |
| CN113250205A (en) * | 2021-06-07 | 2021-08-13 | 北京市地质工程公司 | Excavation supporting method for foundation pit close to existing building |
| CN113699998A (en) * | 2021-05-07 | 2021-11-26 | 金华职业技术学院 | Method for controlling foundation pit settlement deviation |
| CN114892674A (en) * | 2022-05-27 | 2022-08-12 | 中铁二院成都勘察设计研究院有限责任公司 | Foundation pit supporting structure close to existing building and construction method thereof |
| CN115198762A (en) * | 2022-07-22 | 2022-10-18 | 中建一局集团第二建筑有限公司 | Supporting structure next to existing building foundation pit and construction method thereof |
-
2020
- 2020-07-01 CN CN202021256167.1U patent/CN212641473U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113699998A (en) * | 2021-05-07 | 2021-11-26 | 金华职业技术学院 | Method for controlling foundation pit settlement deviation |
| CN113235613A (en) * | 2021-05-24 | 2021-08-10 | 中国铁路设计集团有限公司 | Newly-built foundation pit excavation supporting method using adjacent existing fender post |
| CN113235613B (en) * | 2021-05-24 | 2024-04-05 | 中国铁路设计集团有限公司 | Method for excavating and supporting newly-built foundation pit by utilizing adjacent existing guard piles |
| CN113250205A (en) * | 2021-06-07 | 2021-08-13 | 北京市地质工程公司 | Excavation supporting method for foundation pit close to existing building |
| CN114892674A (en) * | 2022-05-27 | 2022-08-12 | 中铁二院成都勘察设计研究院有限责任公司 | Foundation pit supporting structure close to existing building and construction method thereof |
| CN115198762A (en) * | 2022-07-22 | 2022-10-18 | 中建一局集团第二建筑有限公司 | Supporting structure next to existing building foundation pit and construction method thereof |
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