CN115341551B - Composite soil nail supporting structure for limited soil body and construction method thereof - Google Patents
Composite soil nail supporting structure for limited soil body and construction method thereof Download PDFInfo
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- CN115341551B CN115341551B CN202210937769.0A CN202210937769A CN115341551B CN 115341551 B CN115341551 B CN 115341551B CN 202210937769 A CN202210937769 A CN 202210937769A CN 115341551 B CN115341551 B CN 115341551B
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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
- 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
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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Abstract
The invention discloses a composite soil nail supporting structure for a limited soil body and a construction method thereof, wherein the composite soil nail supporting structure is used for supporting the limited soil body between a foundation pit adjacent to an existing building and the existing building, and comprises the following components: soil nails, surface layers and fixing piles; wherein, the soil nails and the fixed piles are arranged in the limited soil body, and the surface layer is arranged on the side surface of the limited soil body; the soil nails are of an inclined structure, the fixed piles are of a vertical structure, one ends of the soil nails are connected with the fixed piles, and the other ends of the soil nails are connected with the surface layer; the top of the surface layer is covered to the ground, and the bottom of the surface layer is covered to the pit bottom. According to the invention, the soil nails are used for obtaining larger horizontal pulling resistance by virtue of the fixed piles, the safety coefficient of the side slope is greatly improved, the integral safety of the limited soil body side slope can be effectively ensured, and the soil nails, the fixed piles and the surface layer jointly form a stable frame structure, so that the integral stability and safety of the limited soil body are ensured.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting engineering, in particular to a composite soil nail supporting structure for a limited soil body and a construction method thereof.
Background
In foundation pit supporting engineering, when the foundation pit is supported closely to the existing building, the foundation pit side slope is closely adjacent to the existing building, limited soil exists between the foundation pit side slope and the existing building, the supporting width is limited, the foundation pit engineering is relatively close to the red line, the soil nails or the anchor rods are strictly forbidden to surpass the red line, longer soil nails or anchor rods cannot be arranged according to a conventional method, and the shorter soil nails or anchor rods cannot provide larger anchoring force due to the soil body, so that the safety and stability of the foundation pit side slope cannot be guaranteed by adopting a conventional soil nails or anchor rod supporting scheme. In this case, a double-row pile scheme, a large-angle anchor rod pile scheme or an inner supporting scheme is often adopted for supporting the foundation pit.
However, when the foundation pit is supported by the above-described scheme, the following problems are involved: (1) The double-row pile scheme is limited by the supporting depth, the deeper foundation pit cannot be adopted and is often limited by underground pipelines, and compared with the soil nail supporting or pile anchor supporting, the construction cost is often higher; (2) The large-angle anchor pile anchor supporting scheme is small in horizontal pulling force provided by the large-angle anchor pile anchor supporting scheme due to the fact that the angle of the anchor is large, prestress loss is easy to occur, and the overall side slope supporting effect is poor. In actual construction, accidents of failure of the large-angle anchor bolt support occur sometimes; (3) The internal support scheme can solve the problem of the existing building immediately, but in all foundation pit support types, the construction cost is highest, the earth excavation is slowest, and the underground construction period is longest.
Disclosure of Invention
Aiming at the defects of the prior art, the invention designs a composite soil nail supporting structure for a limited soil body, wherein the composite soil nail supporting structure is used for supporting the limited soil body between a foundation pit adjacent to an existing building and the existing building, and comprises the following components: soil nails, surface layers and fixing piles; wherein, the soil nails and the fixed piles are arranged in the limited soil body, and the surface layer is arranged on the side surface of the limited soil body; the soil nails are of an inclined structure, the fixed piles are of a vertical structure, one ends of the soil nails are connected with the fixed piles, and the other ends of the soil nails are connected with the surface layer; the top of the surface layer is covered to the ground, and the bottom of the surface layer is covered to the pit bottom.
Preferably, the fixing pile includes: the pile comprises a first sub-fixed pile, a second sub-fixed pile and a pile top crown beam; the first sub-fixing piles and the second sub-fixing piles are arranged at equal intervals; the first sub-fixing piles and the second sub-fixing piles are arranged in the limited soil body and are connected with the pile crown beam; the length of the first sub-fixing piles is smaller than that of the second sub-fixing piles, the first sub-fixing piles are connected with soil nails positioned on the upper layer of the limited soil body, and the second sub-fixing piles are connected with soil nails positioned on the lower layer of the limited soil body.
Preferably, the soil nail comprises: a soil nail rod body, a soil nail slurry body and a soil nail end; the fixed pile comprises: a fixed pile rod body and fixed pile slurry; the soil nail slurry is arranged on the outer side of the soil nail rod body, and the fixing pile slurry is arranged on the outer side of the fixing pile rod body; one end of the soil nail rod body is connected with the surface layer, the other end of the soil nail rod body is connected with the soil nail end, and the soil nail end is connected with the fixed pile rod body.
Preferably, the fixed piles are micro piles or large piles.
Based on the unified design idea, the invention provides a construction method of a composite soil nail supporting structure, which comprises the following steps: step 1: digging a foundation pit beside the existing building according to a construction drawing; step 2: constructing a fixed pile hole above a foundation pit adjacent to an existing building and a limited soil body between the existing building, and constructing a soil nail hole on the side surface of the limited soil body; step 3: installing soil nails in the soil nail holes, and installing fixing piles in the fixing pile holes, wherein the soil nails are connected with the fixing piles; step 4: repeating the step 2 and the step 3 until all soil nails and fixing piles are installed; step 5: arranging a surface layer on the side surface of a limited soil body, wherein the top of the surface layer is covered to the ground, the bottom of the surface layer is covered to the pit bottom, and the surface layer is connected with soil nails; step 6: all the fixed piles are connected into a whole, and the construction is completed.
Preferably, step 2: constructing a fixed pile hole above a limited soil body between a foundation pit adjacent to an existing building and the existing building, and constructing a soil nail hole on the side surface of the limited soil body, wherein the fixed pile hole comprises the following steps: step 2.1: constructing soil nail holes on the upper layer of the limited soil body and fixing pile holes corresponding to the first sub fixing piles; step 2.2: and constructing a soil nail hole positioned on the lower layer of the limited soil body and a fixed pile hole corresponding to the second sub fixed pile.
Preferably, step 3: installing soil nails in soil nail holes, installing fixing piles in fixing pile holes, wherein the soil nails are connected with the fixing piles, and the method comprises the following steps: step 3.1: the soil nail rod body is arranged in the soil nail hole, and the soil nail end at the end part of the soil nail rod body is required to be arranged into an upper-lower concentric structure during the installation; step 3.2: the fixed pile body is arranged in the fixed pile hole, wherein the fixed pile body is required to pass through soil nail ends of the upper row and the lower row of concentric structures when being arranged; step 3.3: and pouring soil nail slurry in the soil nail holes, and pouring fixing pile slurry in the fixing pile holes.
Preferably, step 5: the surface course sets up on the side of limited soil body, and wherein the top of surface course covers to ground, and the bottom of surface course covers to the hole bottom, is connected the surface course with soil nail, includes following steps: step 5.1: arranging a reinforcing mesh of the surface layer on the side surface of the limited soil body, and fixedly connecting the reinforcing mesh with a soil nail rod body of a soil nail; step 5.2: spraying surface layer concrete on the side surface of the limited soil body, wherein the top of the surface layer concrete is sprayed to the ground, and the bottom of the surface layer concrete is sprayed to the pit bottom.
Preferably, step 6: all the fixing piles are connected into a whole, and the method comprises the following steps: the tops of all the fixed piles are fixedly connected into a whole through the pile top crown beam.
Compared with the closest prior art, the invention has the beneficial effects that:
1. according to the invention, the soil nails are used for obtaining larger horizontal pulling resistance by virtue of the fixed piles, the safety coefficient of the side slope is greatly improved, the integral safety of the limited soil body side slope can be effectively ensured, and the soil nails, the fixed piles and the surface layer jointly form a stable frame structure, so that the integral stability and safety of the limited soil body are ensured.
2. The invention can support only by using soil nails and fixed piles with different heights, has simple and convenient operation, high construction speed, low construction cost and small limitation by construction environmental conditions.
Drawings
FIG. 1 is a schematic installation view of a composite soil nail support structure of the present invention.
Fig. 2 is a schematic structural view of the fixing pile of the present invention.
FIG. 3 is a schematic view showing a first connection of soil nails and fixing piles according to the present invention.
Fig. 4 is a second connection schematic of the soil nail and the fixing pile of the present invention.
Fig. 5 is a third connection schematic diagram of soil nails and fixing piles of the present invention.
Reference numerals:
1-existing building, 2-ground, 3-pit bottom, 4-limited soil body, 5-soil nails, 51-soil nail rod bodies, 52-soil nail slurry, 53-first soil nail end, 54-second soil nail end, 55-third soil nail end, 6-surface layer, 7-fixed piles, 71-first sub fixed piles, 72-second sub fixed piles, 73-fixed pile slurry, 74-first fixed pile rod bodies, 75-second fixed pile rod bodies and 76-third fixed pile rod bodies.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
As shown in fig. 1 to 5, the present invention provides a composite soil nail supporting structure for a limited soil body, the composite soil nail supporting structure being used for supporting a limited soil body 4 between a foundation pit adjacent to an existing building 1 and the existing building 1, the composite soil nail supporting structure comprising: soil nails 5, a surface layer 6 and fixing piles 7; wherein, the soil nails 5 and the fixed piles 7 are arranged in the limited soil body 4, and the surface layer 6 is arranged on the side surface of the limited soil body 4; the soil nails 5 are of an inclined structure, the fixed piles 7 are of a vertical structure, one ends of the soil nails 5 are connected with the fixed piles 7, and the other ends of the soil nails are connected with the surface layer 6; the top of the surface layer 6 is covered to the ground 2, and the bottom of the surface layer 6 is covered to the pit bottom 3. Preferably, the inclination angle of the soil nails 5 is 5-15 degrees, and the fixed piles are micro piles or large piles.
In a preferred embodiment, the fixing piles 7 comprise: a first sub-anchor pile 71, a second sub-anchor pile 72 and a pile top crown beam; the number of the first sub-fixing piles 71 and the second sub-fixing piles 72 is plural, and the plural first sub-fixing piles 71 and the plural second sub-fixing piles 72 are arranged at equal intervals; the first sub-fixing piles 71 and the second sub-fixing piles 72 are arranged in the limited soil body 4 and are connected with the crown beam of the pile top; the length of the first sub-fixing piles 71 is smaller than that of the second sub-fixing piles 72, the first sub-fixing piles 71 are connected with soil nails 5 positioned on the upper layer of the limited soil body 4, and the second sub-fixing piles 72 are connected with soil nails 5 positioned on the lower layer of the limited soil body 4.
In a preferred embodiment, the soil nail 5 comprises: a soil nailing rod body 51, a soil nailing slurry 52 and soil nailing tips; the fixing pile 7 includes: a fixing pile body and a fixing pile slurry 73; soil nail slurry 52 is arranged on the outer side of the soil nail rod body 51, and fixing pile slurry 73 is arranged on the outer side of the fixing pile rod body; one end of the soil nail rod body 51 is connected with the surface layer 6, the other end of the soil nail rod body 51 is connected with the soil nail end, and the soil nail end is connected with the fixing pile rod body. Preferably, the soil nail end is in a round, oval, diamond, rectangular, 8-shaped or hollow sugar gourd-shaped structure. The structure of the fixed pile rod body is matched with the structure of the soil nail end head.
In a preferred embodiment, the soil nail end adopts a first soil nail end 53, the first soil nail end 53 is in a circular structure, the fixing pile body adopts a first fixing pile body 74, the section of the first fixing pile body 74 is in a circular structure, and the outer diameter of the circular structure is smaller than the inner diameter of the circular structure.
Example 2
Substantially the same as in embodiment 1, the same points are not repeated, except that:
the fixing pile 7 includes: a first sub-anchor pile 71, a second sub-anchor pile 72, a third sub-anchor pile and a pile top crown beam.
The number of the first, second and third sub-fixing piles 71, 72 and 72 is plural, and the plurality of first, second and third sub-fixing piles 71, 72 and 72 are arranged at equal intervals.
The first, second and third sub-fixing piles 71, 72 and 72 are all disposed inside the limited soil body 4 and are all connected with the pile crown beam.
The length of the first sub-fixing pile 71 is smaller than the length of the second sub-fixing pile 72, and the length of the second sub-fixing pile 72 is smaller than the length of the third sub-fixing pile.
The first sub-fixing piles 71 are connected with soil nails 5 positioned at the upper layer of the limited soil body 4, the second sub-fixing piles 72 are connected with soil nails 5 positioned at the middle layer of the limited soil body 4, and the third sub-fixing piles are connected with soil nails 5 positioned at the lower layer of the limited soil body 4.
Example 3
Substantially the same as in embodiment 1, the same points are not repeated, except that:
the soil nail end adopts a second soil nail end 54, the second soil nail end 54 adopts an elliptical ring structure, the fixed pile body adopts a second fixed pile body 75, and the section of the second fixed pile body 75 is an elliptical structure.
Example 4
Substantially the same as in embodiment 1, the same points are not repeated, except that:
the soil nail end adopts a third soil nail end 55, the third soil nail end 55 is of an 8-shaped structure, the fixing pile body adopts a third fixing pile body 76, and the third fixing pile body 76 adopts double steel bars, double steel bar bundles, double steel tube bundles or double steel bars.
Example 5
The invention provides a construction method of a composite soil nail supporting structure, which comprises the following steps:
step 1: digging a foundation pit beside the existing building 1 according to a construction drawing;
step 2: soil nail holes positioned on the upper layer of the limited soil body 4 and fixing pile holes corresponding to the first sub-fixing piles 71 are firstly constructed.
Step 3: when the soil nail rod body 51 is installed in the soil nail hole positioned on the upper layer of the limited soil body 4, the soil nail end at the end part of the soil nail rod body 51 is required to be arranged into an upper-lower concentric structure; installing a fixed pile body of the first sub fixed pile 71 in the fixed pile hole, wherein the fixed pile body is required to pass through soil nail ends of the upper and lower concentric structures when being installed; and pouring soil nail slurry 52 in soil nail holes positioned on the upper layer of the limited soil body 4, and pouring fixing pile slurry 73 in fixing pile holes corresponding to the first sub fixing piles 71.
Step 4: and (3) repeating the step (2) and the step (3), and installing soil nails (5) and second sub-fixing piles (72) which are positioned on the lower layer of the limited soil body (4).
Step 5: arranging a reinforcing mesh of the surface layer 6 on the side surface of the limited soil body 4, and fixedly connecting the reinforcing mesh with a soil nail rod body 51 of the soil nail 5 through transverse reinforcement; and spraying surface layer concrete on the side surface of the limited soil body 4, wherein the top of the surface layer concrete is sprayed to the ground 2, and the bottom of the surface layer concrete is sprayed to the pit bottom 3.
Step 6: the tops of all the first and second sub-fixing piles 71 and 72 are fixedly connected as a unit by the pile top crown beam.
Example 6
Substantially the same as in example 5, the same points are not repeated, except that:
step 4: and (3) repeating the steps (2) and (3), firstly installing the soil nails 5 and the second sub-fixing piles 72 positioned at the middle layer of the limited soil body 4, and then installing the soil nails 5 and the third sub-fixing piles positioned at the lower layer of the limited soil body 4.
Step 6: the tops of all the first, second and third sub-fixing piles 71, 72 are fixedly connected into one body by the pile top crown beam.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention as filed.
Claims (5)
1. A composite soil nail supporting structure for a limited soil body, characterized in that the composite soil nail supporting structure is used for supporting a foundation pit adjacent to an existing building (1) and a limited soil body (4) between the existing building (1), and the composite soil nail supporting structure comprises: soil nails (5), a surface layer (6) and fixing piles (7);
wherein, the soil nails (5) and the fixed piles (7) are arranged in the limited soil body (4), and the surface layer (6) is arranged on the side surface of the limited soil body (4);
the soil nails (5) are of an inclined structure, the fixed piles (7) are of a vertical structure, one ends of the soil nails (5) are connected with the fixed piles (7), and the other ends of the soil nails are connected with the surface layer (6);
the top of the surface layer (6) is covered to the ground (2), and the bottom of the surface layer (6) is covered to the pit bottom (3);
the fixing pile (7) comprises: the pile comprises a first sub-fixing pile (71), a second sub-fixing pile (72) and a pile top crown beam;
the number of the first sub-fixing piles (71) and the second sub-fixing piles (72) is a plurality, and the first sub-fixing piles (71) and the second sub-fixing piles (72) are arranged at equal intervals;
the first sub-fixing piles (71) and the second sub-fixing piles (72) are arranged in the limited soil body (4) and are connected with the pile top crown beam;
the length of the first sub-fixing piles (71) is smaller than that of the second sub-fixing piles (72), the first sub-fixing piles (71) are connected with the soil nails (5) positioned on the upper layer of the limited soil body (4), and the second sub-fixing piles (72) are connected with the soil nails (5) positioned on the lower layer of the limited soil body (4);
the soil nail (5) comprises: a soil nail rod body (51), a soil nail slurry body (52) and a soil nail end;
the fixing pile (7) comprises: a fixed pile body and a fixed pile slurry (73);
the soil nailing slurry (52) is arranged on the outer side of the soil nailing rod body (51), and the fixed pile slurry (73) is arranged on the outer side of the fixed pile rod body;
one end of the soil nail rod body (51) is connected with the surface layer (6), the other end of the soil nail rod body (51) is connected with the soil nail end, and the soil nail end is connected with the fixed pile rod body.
2. Composite soil nail supporting structure for limited soil according to claim 1, characterized in that the fixed piles (7) are micro piles or large piles.
3. A method of constructing a composite soil nail supporting structure according to any one of claims 1 to 2, comprising the steps of:
step 1: digging a foundation pit beside the existing building (1) according to a construction drawing;
step 2: constructing a fixed pile hole above a foundation pit adjacent to an existing building (1) and a limited soil body (4) between the existing building (1), and constructing a soil nail hole on the side surface of the limited soil body (4);
step 2.1: constructing soil nail holes on the upper layer of the limited soil body (4) and fixing pile holes corresponding to the first sub fixing piles (71);
step 2.2: constructing soil nail holes positioned on the lower layer of the limited soil body (4) and fixing pile holes corresponding to the second sub fixing piles (72);
step 3: the soil nails (5) are arranged in soil nail holes, and the fixed piles (7) are arranged in the fixed pile holes, wherein the soil nails (5) are connected with the fixed piles (7);
step 3.1: the soil nail rod body (51) is arranged in the soil nail hole, and the soil nail end at the end part of the soil nail rod body (51) is required to be arranged into an upper-lower concentric structure during installation;
step 3.2: installing a fixed pile body in the fixed pile hole, wherein the fixed pile body is required to penetrate through soil nail ends of the upper and lower concentric structures when being installed;
step 3.3: pouring soil nail slurry (52) in the soil nail holes, and pouring fixing pile slurry (73) in the fixing pile holes;
step 4: repeating the step 2 and the step 3 until all soil nails (5) and fixing piles (7) are installed;
step 5: arranging a surface layer (6) on the side surface of a limited soil body (4), wherein the top of the surface layer (6) is covered to the ground (2), the bottom of the surface layer (6) is covered to the pit bottom (3), and the surface layer (6) is connected with the soil nails (5);
step 6: and connecting all the fixed piles (7) into a whole, and completing construction.
4. A construction method according to claim 3, wherein step 5: setting a surface layer (6) on the side surface of a limited soil body (4), wherein the top of the surface layer (6) is covered to the ground (2), the bottom of the surface layer (6) is covered to a pit bottom (3), and the surface layer (6) is connected with soil nails (5), and the method comprises the following steps:
step 5.1: arranging a reinforcing mesh of the surface layer (6) on the side surface of the limited soil body (4), and fixedly connecting the reinforcing mesh with a soil nail rod body (51) of the soil nail (5);
step 5.2: spraying surface layer concrete on the side surface of the limited soil body (4), wherein the top of the surface layer concrete is sprayed to the ground (2), and the bottom of the surface layer concrete is sprayed to the pit bottom (3).
5. A construction method according to claim 3, wherein step 6: -connecting all the fixing piles (7) as one whole, comprising the steps of:
the tops of all the fixed piles (7) are fixedly connected into a whole through pile top crown beams.
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| CN202210937769.0A CN115341551B (en) | 2022-08-05 | 2022-08-05 | Composite soil nail supporting structure for limited soil body and construction method thereof |
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| CN202210937769.0A CN115341551B (en) | 2022-08-05 | 2022-08-05 | Composite soil nail supporting structure for limited soil body and construction method thereof |
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| CN212983867U (en) * | 2020-04-28 | 2021-04-16 | 中南勘察设计院集团有限公司 | Foundation pit supporting structure of soil nail enhanced three-row miniature steel pipe pile frame |
| CN111877366A (en) * | 2020-09-04 | 2020-11-03 | 华东交通大学 | Combined type foundation pit supporting structure and construction method thereof |
| WO2022083785A1 (en) * | 2021-06-07 | 2022-04-28 | 长沙理工大学 | Rapid repair structure for second-level or higher soil slope shallow landslide, and construction method therefor |
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| CN115341551A (en) | 2022-11-15 |
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