CN115198762A - Supporting structure next to existing building foundation pit and construction method thereof - Google Patents
Supporting structure next to existing building foundation pit and construction method thereof Download PDFInfo
- Publication number
- CN115198762A CN115198762A CN202210862063.2A CN202210862063A CN115198762A CN 115198762 A CN115198762 A CN 115198762A CN 202210862063 A CN202210862063 A CN 202210862063A CN 115198762 A CN115198762 A CN 115198762A
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- China
- Prior art keywords
- soil
- piles
- foundation pit
- existing building
- soil nail
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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
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
Abstract
A supporting structure next to an existing building foundation pit and a construction method thereof belong to the technical field of foundation pit construction, and comprise cement-soil piles which are arranged in a limited soil body between supporting piles and an existing building in rows, a row of supporting piles which are arranged on the side, facing the pit, of the limited soil body, the supporting piles and the cement-soil piles are arranged in a staggered mode, a crown beam is arranged between the top ends of the supporting piles, a surface layer is sprayed on the surface, facing the pit, of the supporting piles, and the cement-soil piles are connected in a penetrating mode through obliquely arranged soil nails; the soil nail comprises a soil nail hole obliquely formed in the limited soil body, a soil nail rod body connected in the soil nail hole in a penetrating mode, a secondary grouting pipe inserted in the soil nail hole and slurry poured in the soil nail hole. The invention solves the problems of limited foundation pit depth, poor integral side slope supporting effect, high manufacturing cost and long construction period in the existing supporting mode close to the existing building deep foundation pit.
Description
Technical Field
The invention belongs to the technical field of foundation pit construction, and particularly relates to a foundation pit supporting structure next to an existing building and a construction method thereof.
Background
When the deep foundation pit of the adjacent existing building is supported, because the side slope of the foundation pit is adjacent to the existing building, the supporting width is limited, a plurality of foundation pits can not be laid with soil nails or anchor rods according to the conventional scheme when being supported, but instead, the scheme is a double-row pile scheme, a large-angle anchor rod pile anchor scheme and an inner support scheme, but the scheme also has the following problems:
(1) The double-row pile scheme is limited by the supporting depth, and a deeper foundation pit cannot be adopted and is often limited by an underground pipeline.
(2) The anchor rod horizontal separation of the large-angle anchor rod pile anchor supporting scheme is small, the prestress loss is easily caused, and the integral supporting effect of the side slope is poor.
(3) The inner support scheme can solve the problem of adjacent existing buildings, but has high cost, slow earth excavation and long underground construction period.
Disclosure of Invention
The invention aims to provide a supporting structure of a foundation pit adjacent to an existing building and a construction method thereof, and solves the problems that the depth of the foundation pit is limited, the integral supporting effect of a side slope is poor, the manufacturing cost is high and the construction period is long in the existing supporting mode of the foundation pit adjacent to the existing building.
In order to realize the purpose, the invention adopts the following technical scheme:
a supporting structure next to an existing building foundation pit comprises cement-soil piles which are arranged in rows in a limited soil body between supporting piles and an existing building, a row of supporting piles which are arranged on the side, facing the pit, of the limited soil body, the supporting piles and the cement-soil piles are arranged in a staggered mode, a crown beam is arranged between the top ends of the supporting piles, a surface layer is sprayed on the surface, facing the pit, of the supporting piles, and the cement-soil piles are connected in a penetrating mode through obliquely arranged soil nails; the soil nail comprises a soil nail hole obliquely formed in the limited soil body, a soil nail rod body connected in the soil nail hole in a penetrating mode, a secondary grouting pipe inserted in the soil nail hole and slurry poured in the soil nail hole.
Further preferred technical scheme: the soil nailing rod body is arranged along the axis of the soil nailing hole.
Further preferred technical solution: the soil nails penetrate through the cement soil piles.
Further preferred technical solution: the soil nails are distributed between the two adjacent left and right retaining piles, and the inclination angle between the soil nails and the horizontal plane is-5 to 10 degrees.
Further preferred technical solution: a row of grouting holes are distributed on the secondary grouting pipe along the length direction.
Further preferred technical scheme: the grouting holes in one row face towards the left or the right.
Further preferred technical solution: the secondary grouting pipe is a plastic pipe.
Further preferred technical solution: the supporting piles are vertical piles or inclined piles.
Further preferred technical scheme: the surface layer is a steel mesh concrete spraying surface layer and is arranged on the inner side of the support pile and the surface adjacent to the pit; the transverse net pressing bar in the surface layer is welded or bound with the soil nailing rod body.
The method of constructing a supporting structure for an immediately adjacent existing building foundation pit of claim, comprising the steps of:
step one, measurement and positioning are carried out according to a construction drawing.
And step two, forming a hole in the supporting pile, hoisting a reinforcement cage, pouring concrete, and constructing a top crown beam of the supporting pile.
And step three, constructing the cement-soil pile.
And step four, excavating earthwork.
And fifthly, forming holes by soil nails, forming soil nail holes, and placing a soil nail rod body and a secondary grouting pipe into the soil nail holes.
And step six, binding the surface layer reinforcing mesh, laying reinforcing mesh press bars, and welding or connecting the reinforcing mesh press bars with the leaked reinforcing steel bars of the soil nailing rod body.
And seventhly, grouting in the soil nail hole.
And step eight, after the soil nail slurry is initially set, high-pressure grouting is carried out in the secondary grouting pipe, and the grouting pressure and related parameters are designed by combining the stratum.
And step nine, carrying out concrete spraying construction on the surface layer.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
compared with the existing double-row pile supporting scheme, the double-row pile supporting method is not limited by the depth of foundation pit supporting, has small limitation on construction environment conditions behind a slope, and is low in construction cost.
Compared with the existing large-angle anchor rod pile anchor support, the deformation of the foundation pit slope is easier to control.
Compared with the existing inner support scheme, the construction cost of the invention is greatly reduced, and the construction speed is high.
4, the invention is close to the existing building foundation pit supporting structure, has definite stress, simple and convenient operation, high construction speed, low construction cost and good control of slope deformation, and is a better novel foundation pit supporting type.
Drawings
Figure 1 is a plan view of the invention in close proximity to existing building excavation supporting structures.
Figure 2 is an elevation view of the present invention in close proximity to an existing building excavation supporting structure.
Fig. 3 is a structural view of the soil nail of the present invention.
Reference numerals are as follows: 1-support pile, 2-crown beam, 3-soil nail rod body, 4-soil nail hole, 5-slurry body, 6-secondary grouting pipe, 7-surface layer, 8-cement soil pile, 9-limited soil body and 10-pit bottom.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1 to 3, the present invention relates to a supporting structure of a foundation pit adjacent to an existing building and a construction method thereof.
The utility model provides an existing building foundation ditch supporting construction of next-door neighbour includes the soil cement stake 8 of doing in a row in limited soil body 9, soil cement stake 8 is close to existing building setting, soil cement stake 8 face the hole side and be provided with one row of fender pile 1, fender pile 1 and the crisscross laying of soil cement stake 8, the top of fender pile 1 is provided with one crown beam 2, the face that faces of one row of fender pile 1 sprays there is surface course 7, soil nail through connection through the slope setting between the soil cement stake 8.
The supporting pile 1 is a reinforced concrete cast-in-place pile or a profile steel pile; can be a vertical pile or an inclined pile; can be a cast-in-place pile or a precast pile; the bottom end of the support pile 1 is inserted into the soil body of the pit bottom 10.
The crown beam 2 is arranged at the top of the support pile to connect the support pile into a whole, so that the integrity of the side slope is enhanced.
The soil nail comprises a soil nail hole 4 obliquely formed in a limited soil body 9, a soil nail rod body 3 connected in the soil nail hole 4 in a penetrating manner, a secondary grouting pipe 6 inserted in the soil nail hole 4 and slurry 5 poured in the soil nail hole 4; wherein the soil nailing rod body 3 is arranged along the axis of the soil nailing hole 4, and the soil nailing rod body 3 passes through the cement soil pile 8; the soil nailing rod body 3 is a steel bar; the soil nails are distributed between the two adjacent left and right retaining piles 1, the inclination angle between the soil nails and the horizontal plane is-5-10 degrees, and the soil nails penetrate through and are arranged on the pile bodies of the cement soil piles 8 in the limited soil body 9, so that the uplift resistance of the soil nails is greatly improved, and the retaining piles, the soil nails and the cement soil piles form a supporting framework which is favorable for stabilizing the side slope.
The secondary grouting pipe 6 is a plastic pipe, a row of grouting holes are distributed in the plastic pipe along the length direction, the grouting holes are arranged in the left or right direction in the same direction, the secondary grouting pipe and the soil nail rod body are placed into the soil nail holes before cement slurry is injected, and high-pressure grouting is performed in the secondary grouting pipe after slurry 5 in the soil nail holes is initially set.
The surface layer 7 is a reinforcing mesh concrete spraying surface layer and is arranged on the inner side of the support pile 1 and the face of a pit, and the transverse mesh pressing ribs and the soil nailing rod bodies 3 are connected in a welding or binding mode or other connection modes.
The cement pile 8 is a high-pressure jet grouting pile or a stirring pile, and can also be a rammed cement pile or a concrete pile. The cement soil pile is mainly used for enhancing and improving the strength and the performance of limited soil body, and forms a supporting framework together with the soil nail and the supporting pile.
Compared with the existing double-row pile supporting scheme, the double-row pile supporting method is not limited by the depth of foundation pit supporting, has little limitation on construction environment conditions after a slope, and has low construction cost.
Compared with the existing large-angle anchor rod pile anchor support, the deformation of the foundation pit slope is easier to control.
Compared with the existing inner support scheme, the construction cost of the invention is greatly reduced, and the construction speed is high.
The invention has the advantages of definite stress close to the existing building foundation pit supporting structure, simple and convenient operation, high construction speed, low construction cost and good control of slope deformation, and is a better novel foundation pit supporting type.
The cement soil piles, the soil nails and the soil nail side secondary high-pressure grouting are used for enhancing and effectively improving the strength and performance of the limited soil body behind the foundation pit side slope and reinforcing the limited soil body in a strip-shaped manner, so that the side pressure of the limited soil body to the foundation pit support piles is greatly reduced.
The support piles, the soil nails and the cement soil piles jointly form a support frame of the foundation pit side slope, the side slope support capability is greatly improved, and the deformation of the side slope can be well controlled.
Step one, measurement and positioning are carried out according to a construction drawing.
And step two, forming a hole in the supporting pile 1, hoisting a reinforcement cage, pouring concrete, and constructing the top crown beam 2 of the supporting pile.
And step three, constructing the cement soil pile 8.
And step four, excavating earthwork.
And fifthly, forming holes by soil nails to form soil nail holes 4, and placing the soil nail rod body 3 and the secondary grouting pipe 6 into the soil nail holes 4.
And step six, binding the surface layer 7 with a reinforcing mesh, laying a reinforcing mesh press bar, and welding or connecting the reinforcing mesh press bar with the leaked steel bars outside the soil nailing rod body 3.
And step seven, grouting in the soil nail holes 4.
And step eight, after the soil nail body 5 is initially set, performing high-pressure grouting in the secondary grouting pipe 6, and designing the grouting pressure and related parameters by combining the stratum.
And step nine, carrying out concrete spraying construction on the surface layer 7.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (10)
1. The utility model provides an existing building foundation ditch supporting construction of next-door neighbour which characterized in that: the construction method comprises cement soil piles (8) which are arranged in rows in a limited soil body (9) between a support pile (1) and an existing building, a row of support piles (1) which are arranged on the side, facing a pit, of the limited soil body (9), the support piles (1) and the cement soil piles (8) are arranged in a staggered mode, a crown beam (2) is arranged between the top ends of the support piles (1), a surface layer (7) is sprayed on the face, facing the pit, of each support pile (1), and the cement soil piles (8) are connected in a penetrating mode through soil nails which are obliquely arranged;
the soil nail comprises a soil nail hole (4) obliquely formed in a limited soil body (9), a soil nail rod body (3) connected in the soil nail hole (4) in a penetrating mode, a secondary grouting pipe (6) inserted into the soil nail hole (4) and slurry (5) poured into the soil nail hole (4).
2. The immediately adjacent existing building foundation pit supporting structure of claim 1, wherein: the soil nailing rod body (3) is arranged along the axis of the soil nailing hole (4).
3. The immediately adjacent existing building foundation pit supporting structure of claim 1, wherein: the soil nail penetrates through the cement soil pile (8).
4. The immediately adjacent existing building foundation pit supporting structure of claim 1, wherein: the soil nails are distributed between the two adjacent left and right retaining piles (1), and the inclination angle between the soil nails and the horizontal plane is-5 to 10 degrees.
5. The immediately adjacent existing building foundation pit supporting structure of claim 1, wherein: a row of grouting holes are distributed on the secondary grouting pipe (6) along the length direction.
6. The immediate prior building foundation pit supporting structure of claim 5, wherein: the grouting holes in one row face towards the left or the right.
7. The immediately adjacent existing building foundation pit supporting structure of claim 1, wherein: the secondary grouting pipe (6) is a plastic pipe.
8. The immediately adjacent existing building foundation pit supporting structure of claim 1, wherein: the support piles (1) are vertical piles or inclined piles.
9. The immediately adjacent existing building foundation pit supporting structure of claim 1, wherein: the surface layer (7) is a reinforcing mesh concrete spraying surface layer and is arranged on the inner side of the supporting pile (1) and the surface facing the pit;
the transverse net pressing bar in the surface layer (7) is connected with the soil nailing rod body (3) in a welding or binding way.
10. A method of constructing a supporting structure for an immediately adjacent existing foundation pit of any one of claims 1 to 9, comprising the steps of:
firstly, measuring and positioning according to a construction drawing;
step two, forming holes on the supporting piles (1), hoisting a reinforcement cage, pouring concrete, and constructing a top crown beam (2) of the supporting pile;
thirdly, constructing a cement soil pile (8);
excavating earthwork;
fifthly, forming a hole by the soil nail, forming a soil nail hole (4), and placing a soil nail rod body (3) and a secondary grouting pipe (6) in the soil nail hole (4);
step six, binding the reinforcing mesh on the surface layer (7), laying reinforcing mesh press bars, and welding or connecting the reinforcing mesh press bars with the leaked reinforcing steel bars of the soil nailing rod body (3);
seventhly, grouting in the soil nail hole (4);
after the soil nail slurry body (5) is initially set, high-pressure grouting is carried out in a secondary grouting pipe (6), and the grouting pressure and related parameters are designed by combining the stratum;
and step nine, performing concrete spraying construction on the surface layer (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210862063.2A CN115198762A (en) | 2022-07-22 | 2022-07-22 | Supporting structure next to existing building foundation pit and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210862063.2A CN115198762A (en) | 2022-07-22 | 2022-07-22 | Supporting structure next to existing building foundation pit and construction method thereof |
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| Publication Number | Publication Date |
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| CN115198762A true CN115198762A (en) | 2022-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210862063.2A Pending CN115198762A (en) | 2022-07-22 | 2022-07-22 | Supporting structure next to existing building foundation pit and construction method thereof |
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| CN (1) | CN115198762A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090091460A (en) * | 2008-02-25 | 2009-08-28 | 코오롱건설주식회사 | Soil retaining method for two rows pile using earth anchor |
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| CN103485351A (en) * | 2013-09-30 | 2014-01-01 | 中国建筑股份有限公司 | Inclined pile vertical anchor rod supporting structure for foundation pit supporting and construction method thereof |
| CN104612160A (en) * | 2014-11-18 | 2015-05-13 | 中大建设有限公司 | Maintenance structure for foundation pit next to existing building and construction method |
| CN104863177A (en) * | 2015-06-11 | 2015-08-26 | 云南建工基础工程有限责任公司 | Composite retaining wall structure and construction method thereof |
| CN106677192A (en) * | 2017-03-03 | 2017-05-17 | 周同和 | Row pile anchoring cement soil pile continuous wall supporting structure and construction process thereof |
| CN208346827U (en) * | 2018-06-07 | 2019-01-08 | 泉发建设股份有限公司 | Foundation pit comprehensive support structure |
| CN110241828A (en) * | 2019-06-19 | 2019-09-17 | 深圳市中邦(集团)建设总承包有限公司 | The outer sealing construction method for supporting of anchor in a kind of row's grating tubular pole grouting behind shaft or drift lining |
| CN212641473U (en) * | 2020-07-01 | 2021-03-02 | 中建一局集团第三建筑有限公司 | Foundation pit supporting structure adjacent to existing building |
| CN113585289A (en) * | 2021-09-18 | 2021-11-02 | 中冶建工集团有限公司 | Support method for collapse soil deep foundation pit |
-
2022
- 2022-07-22 CN CN202210862063.2A patent/CN115198762A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090091460A (en) * | 2008-02-25 | 2009-08-28 | 코오롱건설주식회사 | Soil retaining method for two rows pile using earth anchor |
| CN202323957U (en) * | 2011-11-17 | 2012-07-11 | 中国水电顾问集团华东勘测设计研究院 | Stiff composite soil nail supporting structure for soft soil area |
| CN103485351A (en) * | 2013-09-30 | 2014-01-01 | 中国建筑股份有限公司 | Inclined pile vertical anchor rod supporting structure for foundation pit supporting and construction method thereof |
| CN104612160A (en) * | 2014-11-18 | 2015-05-13 | 中大建设有限公司 | Maintenance structure for foundation pit next to existing building and construction method |
| CN104863177A (en) * | 2015-06-11 | 2015-08-26 | 云南建工基础工程有限责任公司 | Composite retaining wall structure and construction method thereof |
| CN106677192A (en) * | 2017-03-03 | 2017-05-17 | 周同和 | Row pile anchoring cement soil pile continuous wall supporting structure and construction process thereof |
| CN208346827U (en) * | 2018-06-07 | 2019-01-08 | 泉发建设股份有限公司 | Foundation pit comprehensive support structure |
| CN110241828A (en) * | 2019-06-19 | 2019-09-17 | 深圳市中邦(集团)建设总承包有限公司 | The outer sealing construction method for supporting of anchor in a kind of row's grating tubular pole grouting behind shaft or drift lining |
| CN212641473U (en) * | 2020-07-01 | 2021-03-02 | 中建一局集团第三建筑有限公司 | Foundation pit supporting structure adjacent to existing building |
| CN113585289A (en) * | 2021-09-18 | 2021-11-02 | 中冶建工集团有限公司 | Support method for collapse soil deep foundation pit |
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