CN114922198A - Foundation pit external corner supporting method and foundation pit construction method - Google Patents
Foundation pit external corner supporting method and foundation pit construction method Download PDFInfo
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- CN114922198A CN114922198A CN202210653718.5A CN202210653718A CN114922198A CN 114922198 A CN114922198 A CN 114922198A CN 202210653718 A CN202210653718 A CN 202210653718A CN 114922198 A CN114922198 A CN 114922198A
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- 238000010276 construction Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000002689 soil Substances 0.000 claims abstract description 31
- 238000009412 basement excavation Methods 0.000 claims abstract description 8
- 230000001154 acute effect Effects 0.000 claims description 33
- 239000011150 reinforced concrete Substances 0.000 claims description 20
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 239000004567 concrete Substances 0.000 description 8
- 238000005266 casting Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
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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
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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
- E02D15/08—Sinking workpieces into water or soil inasmuch as not provided for elsewhere
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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
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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
- E02D17/18—Making embankments, e.g. dikes, dams
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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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The invention relates to a foundation pit external corner supporting method and a foundation pit supporting method, comprising the following steps of: excavating a supporting pit for a soil body on the outer side of the position of the external corner of the foundation pit, wherein the supporting pit takes an inner side enclosing structure at the external corner of the foundation pit as a pit wall, and other pit walls of the supporting pit are excavated by adopting multi-stage slope excavation to form a multi-stage slope bottom; constructing a foundation pit external corner supporting structure at each grade of slope bottom in sequence and backfilling until the supporting pit is backfilled to the unearthed ground surface; and backfilling the soil body after the construction of the foundation pit external corner supporting structure corresponding to the set grade slope bottom is finished until the soil body is backfilled to the previous grade slope bottom.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting structure construction, in particular to a foundation pit external corner supporting method and a foundation pit construction method.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Along with the development in building field, more and more building toward higher deeper direction construction, this area and the degree of depth that just makes the building foundation ditch constantly increase, and the foundation ditch shape also is diversified development for the needs that adapt to city development, can not avoid forming the foundation ditch external corner at the excavation supporting in-process, and there is great settlement in the foundation ditch external corner department can be because of the influence of hole angle effect, subsides deformation control for supporting construction and increases the degree of difficulty.
Usually, the construction of a foundation pit is mainly influenced by two space effects of a foundation pit supporting form and the self space shape of the foundation pit, and when the two space effects are superposed, the two space effects often bring great safety risks to the construction of the foundation pit with a singular plane shape, and if the two space effects are not properly treated, economic losses are possibly brought, so that the foundation pit supporting is a part which needs to be focused in the design and construction of the foundation pit supporting. At present, research aiming at the space effect caused by the plane shape of the foundation pit is deficient, and similar engineering experience is utilized to process in engineering practice.
For a foundation pit with a singular plane shape, the external corner of the foundation pit is usually the maximum displacement position of a full supporting structure, and due to the characteristics of soil anisotropy and the like, accurate prediction cannot be performed through theoretical calculation temporarily, and judgment can only be performed through theoretical qualitative analysis and engineering practical experience. Although the appearance of the external corner of the foundation pit is reduced as much as possible during the design of the foundation pit support, the external corner of the foundation pit is difficult to completely avoid due to the existence of a plurality of adverse factors. If the influence of the external corner space effect of the foundation pit on the deformation of the supporting structure is not considered, great danger is brought to the foundation pit; if measures are only taken to control the external corner effect of the foundation pit on the ground surface, overlarge deformation caused by the space effect in the depth direction of the external corner of the foundation pit can be caused, and even the foundation pit collapses; if the measure for treating the external corner of the foundation pit is too conservative, the construction progress is slow, and the construction cost is increased.
In the prior art, partial researches on supporting the external corner of a foundation pit are carried out. For example, chinese patent application No. 202020686493.X describes a treatment structure for the external corner of a foundation pit. According to the method, two parallel back tension beams are arranged at the external corner of the foundation pit, and the two sides of the external corner of the foundation pit are self-balanced by the back tension beams, so that the displacement of the supporting structure at the external corner of the foundation pit into the foundation pit is reduced. The method is characterized in that two parallel back tension beams are used for balancing the displacement of the external corner, and compared with the traditional external corner supporting method, the method has higher reliability, but the inventor finds that the treatment mode only limits the displacement of the topmost end of the external corner of the foundation pit, and does not have obvious control effect on the displacement of the external corner of the foundation pit into the pit in the depth direction. Therefore, the method still cannot play a good role in limiting the displacement of the external corner of the foundation pit.
To sum up, how to design a supporting structure for an external corner of a foundation pit and have high feasibility, the supporting structure can limit the displacement of the stratum and the supporting structure within a certain depth range at the position of the external corner, and the problems to be solved by the technicians in the field need to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a foundation pit external corner supporting method which can limit the displacement of strata and supporting structures within a certain depth range at the position of an external corner and ensure the safety of foundation pit construction.
In order to achieve the purpose, the invention adopts the following technical scheme
The embodiment of the invention provides a foundation pit external corner supporting method, which comprises the following steps:
excavating a supporting pit for a soil body on the outer side of the position of the external corner of the foundation pit, wherein the supporting pit takes an inner side enclosure structure at the external corner of the foundation pit as a pit wall, and other pit walls of the supporting pit are excavated by adopting multi-level slope sinking to form a multi-level slope bottom;
constructing a foundation pit external corner supporting structure at each grade of slope bottom in sequence and backfilling until the supporting pit is backfilled to the unearthed ground surface;
and backfilling soil after the construction of the external corner supporting structure of the foundation pit corresponding to the set grade slope bottom is finished until the soil is backfilled to the slope bottom of the previous grade slope.
Optionally, the supporting pit has four pit walls, the inner side enclosure structure at the external corner of the foundation pit is used as two pit walls of the supporting pit, and the rest two pit walls of the supporting pit are excavated by slope-making to form a multi-stage slope bottom.
Optionally, when the external corner supporting structure of the foundation pit is constructed, the ratio of the length of the embedded soil body to the length of the extending corresponding grade slope bottom surface is 1: 2.
Optionally, when the external corner supporting structure of the foundation pit is constructed, the top surface of the external corner supporting structure of the foundation pit is flush with the bottom surface of the upper grade slope bottom.
Optionally, the supporting structure for the external corner of the foundation pit comprises a first stand column pile and a second stand column pile, a supporting wall is arranged between the first stand column pile and the second stand column pile, a first back-tension beam is arranged between the first stand column pile and one of the two inner side enclosure structures of the external corner of the foundation pit, and a second back-tension beam is arranged between the second stand column pile and the other inner side enclosure structure of the external corner of the foundation pit.
Optionally, reinforcing ribs and stirrups are arranged between the first back-tension beam and the first upright post pile as well as between the first back-tension beam and the inner enclosure structure of the outer corner of the foundation pit, and reinforcing ribs and stirrups are arranged between the second back-tension beam and the second upright post pile as well as between the second back-tension beam and the inner enclosure structure of the outer corner of the foundation pit.
Optionally, the first back bracing beam is arranged at the top end of the first upright pile, and the second back bracing beam is arranged at the top end of the second upright pile.
Optionally, an included angle between the first back-tension beam and the inner side enclosure structure on one side of the outer corner of the foundation pit is a first acute angle, an included angle between an integral structure formed by the first stand column, the second stand column and the reinforced concrete wall and the outer side enclosure structure on the side is a third acute angle, the first acute angle is larger than the third acute angle, a clamping position between the second back-tension beam and the inner side maintenance structure on the other side of the outer corner of the foundation pit is a second acute angle, an included angle between the integral structure formed by the first stand column, the second stand column and the reinforced concrete wall and the inner side enclosure structure on the outer side of the outer corner is a fourth acute angle, and the second acute angle is larger than the fourth acute angle.
Optionally, the first upright column pile and the second upright column pile are constructed on a construction surface formed by the backfill soil and the slope bottom surface, wherein the construction positions of the first upright column pile and the second upright column pile are located on a diagonal line of the construction surface, the diagonal line does not pass through the position of an external corner of the foundation pit, the distance between the first upright column pile and the same side end point and the same side middle point of the diagonal line are equal, and the distance between the second upright column pile and the same side end point and the same side middle point of the diagonal line are equal.
In a second aspect, an embodiment of the present invention provides a foundation pit construction method, where the external corner of the foundation pit is supported by using the foundation pit external corner support construction method described in the first aspect.
The invention has the beneficial effects that:
1. according to the method for supporting the external corner of the foundation pit, the supporting pit is excavated by carrying out multistage slope setting, and the external corner supporting structure is arranged at the bottom of each grade of slope, so that the external corner of the foundation pit can be supported by the external corner supporting structure at different depths, the displacement of the external corner at each depth is greatly reduced by utilizing the self-balance of the external corner of the foundation pit, the pressure borne by a subsequent inner support is relieved, and the stability and the safety of the foundation pit and the surrounding environment are ensured.
2. According to the method for supporting the external corner of the foundation pit, the first acute angle is larger than the third acute angle, the second acute angle is larger than the fourth acute angle, the stress of the first back tension beam and the second back tension beam is reduced, and the stable structure and the safety of the first back tension beam and the second back tension beam are guaranteed.
3. According to the foundation pit external corner supporting method, the first upright column pile and the second upright column pile are arranged at positions which enable the reinforced concrete wall to be arranged on the diagonal line of the excavation surface, so that the reinforced concrete wall is ensured to have enough area to resist an external soil body; and the earth-retaining area is not too large, economic loss is caused, soil bodies on two sides of the reinforced concrete wall are approximately equal, active soil pressure acting on the support pile is similar, and the tension difference of the two side back tension beams for offsetting the soil body on the outer side is not too large.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a flowchart of a supporting method according to example 1 of the present invention;
fig. 2 is a schematic view of the overall structure of a foundation pit external corner supporting structure in embodiment 1 of the invention;
fig. 3 is a top view of a foundation pit external corner supporting structure in embodiment 1 of the invention after construction is completed;
the construction method comprises the following steps of 1, an inner-layer enclosure structure, 2, an outer-layer enclosure structure, 3, an intermediate soil body, 4, a foundation pit external corner, 5, a third-level slope bottom, 6, a second-level slope bottom, 7, a first-level slope bottom, 8, a foundation pit external corner supporting structure and 9, a ground surface;
8-1 of a first upright pile, 8-2 of a second upright pile, 8-3 of a reinforced concrete wall, 8-4 of a first back tension beam, and 8-5 of a second back tension beam.
Detailed Description
Example 1
The embodiment provides a method for supporting an external corner of a foundation pit, which comprises the following steps as shown in fig. 1:
step 1: after an inner layer enclosure structure 1 and an outer layer enclosure structure 2 of a foundation pit are constructed in advance, a middle soil body 3 is arranged between the inner layer enclosure structure and the outer layer enclosure structure, the position shape of the foundation pit with the external corner on site is checked, the range of the excavated soil body is marked by taking the inner layer enclosure structures on two adjacent sides of the external corner 4 of the foundation pit as edges, and then the soil body on the outer side of the position of the external corner 4 of the foundation pit is excavated to form a supporting pit.
In this embodiment, the supporting pit is a rectangular pit, two adjacent vertical inner-layer enclosure structures at the external corner position are used as two pit walls of the supporting pit, and the two inner-layer enclosure structures used as the pit walls of the supporting pit are defined as a first inner-layer enclosure structure and a second inner-layer enclosure structure respectively.
In the embodiment, three-level slope excavation is adopted, and after excavation, a third-level slope bottom 5, a second-level slope bottom 6 and a first-level slope bottom 7 are formed from bottom to top.
Step 2: and constructing the external corner supporting structure 8 of the foundation pit at each grade of slope bottom in sequence, and backfilling until the supporting pit is backfilled to the unearthed ground surface.
Specifically, as shown in fig. 2, the external corner supporting structure of the foundation pit includes a first upright post pile 8-1 and a second upright post pile 8-2, and a supporting wall is arranged between the first upright post pile 8-1 and the second upright post pile 8-2, where the supporting wall in this embodiment is a reinforced concrete wall 8-3.
The top of the first upright post pile 8-1 is provided with a first back tension beam 8-4, and the top of the second upright post pile 8-2 is provided with a second back tension beam 8-5.
The first upright post pile 8-1, the second upright post pile 8-2 and the supporting wall are used for being inserted into soil at the slope bottom, the first back tension beam 8-4 is used for being arranged between the first upright post pile 8-1 and the first inner-layer enclosure structure, the second back tension beam 8-5 is used for being arranged between the second upright post pile 8-2 and the second inner-layer enclosure structure, and then the position of the external corner 4 of the foundation pit is supported through the first back tension beam 8-4 and the second back tension beam 8-5.
In this embodiment, the concrete type number of the reinforced concrete wall 8-3 is smaller than the concrete type number of the first upright post pile 8-1 and the second upright post pile 8-2, the concrete type number of the first upright post pile 8-1 and the second upright post pile 8-2 is smaller than the concrete type number of the first back tension beam 8-3 and the second back tension beam 8-4, specifically, the reinforced concrete wall 8-3 is formed by casting C15 concrete, the first upright post pile 8-1 and the second upright post pile 8-2 are formed by casting C30 concrete, and the first back tension beam 8-4 and the second back tension beam 8-5 are formed by casting C40 concrete.
Firstly, constructing a foundation pit external corner supporting structure 8 at the position of a three-level slope bottom 5, and excavating soil bodies at the positions of a first upright column pile 8-1, a second upright column pile 8-2 and a reinforced concrete wall 8-3.
The construction method comprises the following steps of constructing a first upright post pile 8-1 and a second upright post pile 8-2, wherein the bottom surface of a tertiary slope bottom 5 is a rectangular surface, the rectangular surface is provided with a first diagonal line and a second diagonal line, the first diagonal line is a diagonal line which does not pass through the position of an external corner 4 of a foundation pit, the construction positions of the first upright post pile 8-1 and the second upright post pile 8-2 are located on the first diagonal line, the distance between the end part and the midpoint of the same side of the first upright post pile 8-1 and the first diagonal line is A, the distance between the end part and the midpoint of the same side of the second upright post pile 8-2 and the first diagonal line is B, and A and B are equal.
Arranging the reinforced concrete wall on a diagonal line of an excavated surface to ensure that the reinforced concrete wall has enough area to resist an outer soil body; and unlikely earth-retaining area is too big, causes economic loss, and A equals B for the reinforced concrete wall both sides soil body is roughly equal, and the initiative soil pressure that produces and act on the fender pile is close, is unlikely to both sides back of the body straining beam and offsets the pulling force of outside soil body and differs too greatly.
After the strength of the first upright column pile 8-1 and the second upright column pile 8-2 meets the requirement, a reinforced concrete wall 8-3 is poured between the first upright column pile 8-1 and the second upright column pile 8-2, and then a first back tension beam 8-4 and a second back tension beam 8-5 are constructed.
The specific construction method of the first back tension beam 8-4 comprises the following steps:
the first inner-layer building envelope and the first upright post pile 8-1 are provided with holes, a plurality of stirrups and reinforcing ribs are arranged in the holes, then the first back-tension beam 8-4 is poured by concrete, and the first back-tension beam 8-4 extends into the first inner-layer building envelope and the first upright post pile 8-1 and is integrally poured with the first inner-layer building envelope and the first upright post pile 8-1.
The construction method of the second back tension beam 8-5 is the same as that of the first back tension beam 8-4, and a description thereof will not be repeated.
In the embodiment, the integral structures formed by the first back-tension beam 8-4 and the second back-tension beam 8-5 and the first upright post pile 8-1, the second upright post pile 8-2 and the reinforced concrete wall 8-3 are arranged in a set obtuse angle, so that after the construction of the whole external corner supporting structure is completed, the included angles between the first back-tension beam 8-4 and the second back-tension beam 8-5 and the foundation pit external corner inner-layer enclosure structure 1 are respectively a first acute angle and a second acute angle, the included angles between the integral structures formed by the first upright post pile 8-1, the second upright post pile 8-2 and the reinforced concrete wall 8-3 and the foundation pit external corner inner-side enclosure structure 1 are respectively a third acute angle and a fourth acute angle, the first acute angle is larger than the third acute angle, and the second acute angle is larger than the fourth acute angle.
As shown in fig. 3, an included angle between the first back-tension beam and the inner side envelope structure at one side is a first acute angle α 1 The included angle between the integral structure formed by the first upright post pile, the second upright post pile and the reinforced concrete wall and the inner side maintenance structure at the side is a third acute angle beta 1 。
The vertical pressure Fk to which the inside side envelope is subjected is constant, so considering the stress balance, in the vertical direction shown in fig. 3: fk is F Back of body sinα 1 Therefore F is Back of body ＝Fk/sinα 1
Since Fk is constant, F Back of body Is determined by the first acute angle alpha 1 The size of (2).
If α is 1 ＝β 1 Then F Back beta ＝Fk/sinβ 1
If α is 1 ＞β 1 Then F Back alpha ＝Fk/sinα 1
And because of alpha 1 ＞β 1 Therefore sin α 1 ＞sinβ 1 Therefore 1/sin α 1 ＜1/sinβ 1 ，
So Fk/sin α 1 ＜Fk/sinβ 1 Therefore F is Back alpha ＜F Back beta
Therefore, α under the condition that Fk is constant 1 Greater than beta 1 I.e. the first acute angle is greater than the third acute angle, the first back-pull beam is under tension F Back of body The smaller the size, the stronger the load bearing capacity.
The top surfaces of the first upright column pile 8-1, the second upright column pile 8-2 and the reinforced concrete wall 8-3 are flush with the bottom surface of the second-stage slope bottom 6.
And after the construction of the foundation pit external corner supporting structure 8 of the third-level slope bottom 5 is completed, checking the foundation pit external corner supporting structure 8, backfilling the supporting pit after the strength of the foundation pit external corner supporting structure 8 meets the requirement until the supporting pit is flush with the bottom surface of the second-level slope bottom 6, and embedding the foundation pit external corner supporting structure 8 constructed at the third-level slope bottom 5 into backfilled soil.
After backfilling, the backfilled soil and the bottom surface of the secondary slope bottom 6 form a rectangular construction surface, and a foundation pit external corner supporting structure 8 corresponding to the secondary slope bottom 6 is constructed on the construction surface in the same way as the construction method of the foundation pit external corner supporting structure 8 corresponding to the primary slope bottom 5, which is not described in detail herein.
And backfilling the foundation pit external corner supporting structure 8 corresponding to the second-level slope bottom 6 until the foundation pit external corner supporting structure is backfilled to be level with the bottom surface of the first-level slope bottom 7, forming a rectangular construction surface by the backfilled soil and the bottom surface 7 of the first-level slope bottom, constructing the foundation pit external corner supporting structure 8 corresponding to the first-level slope bottom on the construction surface, backfilling the foundation pit after the construction is finished until the foundation pit is backfilled to the surface 9 which is not excavated, and backfilling the whole supporting pit at the moment.
In the embodiment, because the multistage slope-releasing excavation supporting pit is adopted, the external corner supporting structure 8 is arranged at the bottom of each grade of slope, the external corner 4 of the foundation pit can be supported by the external corner supporting structure 8 at different depths, the self-balance of the external corner 4 of the foundation pit is utilized, the displacement of the external corner at each depth is greatly reduced, the pressure on the subsequent inner support is relieved, and the stability and the safety of the foundation pit and the surrounding environment are ensured.
Example 2:
the embodiment provides a foundation pit construction method, firstly an inner-layer enclosure structure 1 and an outer-layer enclosure structure 2 of a foundation pit are constructed, a middle soil body 3 is arranged between the inner-layer enclosure structure 1 and the outer-layer enclosure structure 2, the construction method of the inner-layer enclosure structure 1 and the outer-layer enclosure structure 2 only adopts the existing construction method, and detailed description is not provided herein.
And (4) supporting at the external corner 4 of the foundation pit by adopting the method in the embodiment 1.
After the supporting of the external corner 4 of the foundation pit is completed, the main foundation pit starts to be excavated, and the excavation method adopts the existing construction method.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A foundation pit external corner supporting method is characterized by comprising the following steps:
excavating a supporting pit for a soil body on the outer side of the position of the external corner of the foundation pit, wherein the supporting pit takes an inner side enclosing structure at the external corner of the foundation pit as a pit wall, and other pit walls of the supporting pit are excavated by adopting multi-stage slope excavation to form a multi-stage slope bottom;
constructing a foundation pit external corner supporting structure at each grade of slope bottom in sequence and backfilling until the supporting pit is backfilled to the unearthed ground surface;
and backfilling a soil body after the construction of the external corner supporting structure of the foundation pit corresponding to the set grade slope bottom is finished until the soil body is backfilled to the slope bottom of the previous grade.
2. A method for supporting the external corner of a foundation pit as claimed in claim 1, wherein the supporting pit has four walls, the internal enclosure at the external corner of the foundation pit is used as two walls of the supporting pit, and the other two walls of the supporting pit are excavated by slope-making to form a multi-stage slope bottom.
3. The method for supporting the external corner of the foundation pit as claimed in claim 1, wherein the ratio of the length of the embedded soil body to the length of the bottom surface extending out of the corresponding grade of slope is 1:2 when the external corner supporting structure of the foundation pit is constructed.
4. The method as claimed in claim 1, wherein the external corner support structure is constructed such that the top surface of the external corner support structure is flush with the bottom surface of the upper slope.
5. A method for supporting an external corner of a foundation pit as claimed in claim 1, wherein the external corner supporting structure of the foundation pit comprises a first upright pile and a second upright pile, a supporting wall is arranged between the first upright pile and the second upright pile, a first back-tension beam is arranged between the first upright pile and one of the two internal side enclosures of the external corner of the foundation pit, and a second back-tension beam is arranged between the second upright pile and the other internal side enclosure of the external corner of the foundation pit.
6. The method for supporting the external corner of the foundation pit as claimed in claim 5, wherein reinforcing ribs and stirrups are arranged between the first back tension beam and the first vertical column pile and between the second back tension beam and the second vertical column pile and between the second back tension beam and the internal enclosure of the external corner of the foundation pit.
7. A method for supporting the external corner of a foundation pit as claimed in claim 5, wherein the first back bracing is provided at the top end of the first vertical pile and the second back bracing is provided at the top end of the second vertical pile.
8. The method of claim 5, wherein the included angle between the first back tension beam and the inside enclosure of one side of the external corner of the foundation pit is a first acute angle, the included angle between the integrated structure formed by the first column, the second column and the reinforced concrete wall and the outside enclosure of the side external corner is a third acute angle, the first acute angle is larger than the third acute angle, the second back tension beam and the inside maintenance structure of the other side of the external corner of the foundation pit are clamped to be a second acute angle, the integrated structure formed by the first column, the second column and the reinforced concrete wall and the inside enclosure of the side external corner are fourth acute angles, and the second acute angle is larger than the fourth acute angle.
9. A foundation pit external corner supporting method as claimed in claim 5, wherein the first and second vertical column piles are constructed on a construction surface formed by the backfill and the bottom surface of the slope, wherein the construction positions of the first and second vertical column piles are located on a diagonal line of the construction surface, the diagonal line does not pass through the position of the external corner of the foundation pit, the distance between the first vertical column pile and the same side end point and midpoint of the diagonal line is equal to the distance between the second vertical column pile and the same side end point and midpoint of the diagonal line.
10. A foundation pit construction method, characterized in that the external corner of the foundation pit is supported by the method for supporting the external corner of the foundation pit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210653718.5A CN114922198B (en) | 2022-06-10 | 2022-06-10 | Foundation pit external corner supporting method and foundation pit construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210653718.5A CN114922198B (en) | 2022-06-10 | 2022-06-10 | Foundation pit external corner supporting method and foundation pit construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114922198A true CN114922198A (en) | 2022-08-19 |
| CN114922198B CN114922198B (en) | 2024-03-15 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06336730A (en) * | 1993-05-27 | 1994-12-06 | Koyo Kogyo Kk | Angle brace holding piece |
| KR100958426B1 (en) * | 2009-06-26 | 2010-05-18 | 주식회사 엠스틸인터내셔날 | Fixing device for support beam |
| CN203411980U (en) * | 2013-05-24 | 2014-01-29 | 山东科技大学 | Hinged anchor beam support device for foundation pit external corner |
| CN204370417U (en) * | 2014-11-13 | 2015-06-03 | 昆明理工大学 | A kind of for base pit engineering external corner or the road place of going along with sb. to guard him to drawing cable bolting structure |
| CN208201885U (en) * | 2018-05-03 | 2018-12-07 | 云南建投基础工程有限责任公司 | A kind of supporting construction at multiple external corners continuous in base pit engineering |
| CN109403342A (en) * | 2018-10-31 | 2019-03-01 | 中建局集团建设发展有限公司 | A kind of foundation pit mixing support construction and its construction method |
-
2022
- 2022-06-10 CN CN202210653718.5A patent/CN114922198B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06336730A (en) * | 1993-05-27 | 1994-12-06 | Koyo Kogyo Kk | Angle brace holding piece |
| KR100958426B1 (en) * | 2009-06-26 | 2010-05-18 | 주식회사 엠스틸인터내셔날 | Fixing device for support beam |
| CN203411980U (en) * | 2013-05-24 | 2014-01-29 | 山东科技大学 | Hinged anchor beam support device for foundation pit external corner |
| CN204370417U (en) * | 2014-11-13 | 2015-06-03 | 昆明理工大学 | A kind of for base pit engineering external corner or the road place of going along with sb. to guard him to drawing cable bolting structure |
| CN208201885U (en) * | 2018-05-03 | 2018-12-07 | 云南建投基础工程有限责任公司 | A kind of supporting construction at multiple external corners continuous in base pit engineering |
| CN109403342A (en) * | 2018-10-31 | 2019-03-01 | 中建局集团建设发展有限公司 | A kind of foundation pit mixing support construction and its construction method |
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| CN114922198B (en) | 2024-03-15 |
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