CN111549784A - Construction process of foundation pit adjacent to building - Google Patents
Construction process of foundation pit adjacent to building Download PDFInfo
- Publication number
- CN111549784A CN111549784A CN202010454347.9A CN202010454347A CN111549784A CN 111549784 A CN111549784 A CN 111549784A CN 202010454347 A CN202010454347 A CN 202010454347A CN 111549784 A CN111549784 A CN 111549784A
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- Prior art keywords
- foundation pit
- foundation
- construction
- concrete
- existing building
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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
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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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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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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- 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
Abstract
The invention discloses a construction process of a foundation pit adjacent to a building, which is technically characterized by comprising the following steps of: step A, existing building foundation processing construction: a1, measuring and positioning the foundation of the existing building; a2, excavating a lateral channel downwards on the outer soil layer of the existing building foundation until the bottom surface of the lateral channel is lower than that of the existing building foundation; a3, horizontally reaming the bottom of the bottom surface of the lateral channel below the existing building foundation, and vertically and deeply digging to form a support hole after reaming the bottom end of the lateral channel below the existing building foundation; a4, pouring concrete on the inner wall of the support hole to form a reinforcing pile; and step B, constructing the foundation pit, namely excavating the foundation pit and reinforcing the side wall of the foundation pit on the outer side of the building. Through the scheme, the reinforcing piles are used for supporting stress on the existing building, the slope distance required by the foundation pit during construction is reduced, finally, foundation pit construction near the building is achieved, excessive supporting in the foundation pit is not needed, and the effective area of the foundation pit is guaranteed.
Description
Technical Field
The invention relates to the technical field of foundation pit construction, in particular to a construction process of a foundation pit adjacent to a building.
Background
In recent years, the urbanization process of China is accelerated continuously, and the construction of cities and towns is developed rapidly. A large number of various buildings and underground engineering such as underground garages, underground malls, subways, underground transportation hubs and civil air defense facilities are built in dense urban areas, and foundation pit engineering is visible everywhere. In urban areas with dense buildings, the foundation pit works are often located close to the existing buildings around. The foundation pit often has the condition that the slope distance is not enough in the construction process, and if the slope distance is shortened, the potential safety hazard to buildings around the foundation pit is directly caused.
Disclosure of Invention
The invention aims to provide a construction process of a foundation pit adjacent to a building, which aims to smoothly carry out foundation pit construction near the existing building.
The invention is realized by the following technical scheme:
a construction process of foundation pits adjacent to buildings is characterized by comprising the following steps:
step A, existing building foundation processing construction:
a1, measuring and positioning the foundation of the existing building;
a2, excavating a lateral channel downwards, and excavating the lateral channel downwards from an outer soil layer of an adjacent existing building foundation until the bottom surface of the lateral channel is lower than the bottom surface of the existing building foundation;
a3, digging support holes downwards, horizontally reaming the bottom of the bottom surface of the lateral channel below the existing building foundation, and vertically digging the lateral channel downwards deeply after reaming the bottom end of the lateral channel below the existing building foundation to form the support holes;
a4, pouring reinforcing piles, binding reinforcement cages on the inner walls of the supporting holes and pouring concrete into the supporting holes to form the reinforcing piles;
and step B, constructing the foundation pit, namely excavating the foundation pit and reinforcing the side wall of the foundation pit on the outer side of the building.
By adopting the technical scheme, after the position of the existing building foundation is measured, the supporting hole is formed from the excavating channel to the position under the existing building foundation, the reinforcing pile is formed in the supporting hole by pouring, and then the reinforcing pile is used for supporting and stressing the existing building, so that the pressure on the earth surface of the existing building and a shallow soil layer is smaller, at the moment, the required slope distance of the foundation pit during construction can be effectively reduced, and finally foundation pit construction near the existing building is realized.
Further setting the following steps: the step B also comprises the following steps:
b1, earth surface earth excavation;
b2, spraying bottom layer concrete, and spraying concrete on the excavated side slope;
b3, carrying out anchor rod, soil nail and net hanging construction on the side slope;
b4, spraying the surface layer to the slope with the anchor rod and the net.
Further setting the following steps: and (C) during foundation pit construction, sequentially layering a plurality of layers of earthwork gradually downwards on the soil layer, and repeating the step (B) during construction of each layer of earthwork.
Through adopting above-mentioned technical scheme, make the foundation ditch at the excavation in-process, the excavation of one deck is restarted after every layer of earthwork all obtains effectively strengthening for whole foundation ditch excavation process safety and stability avoids causing the surface soil layer to collapse because single excavation degree of depth is too big, and the stable construction of foundation ditch is carried out near the existing building to further the guarantee.
Further setting the following steps: when each layer of earthwork is excavated, a soil layer with the thickness of 10-20 cm is reserved on the surface of the slope wall of the earthwork, and slope trimming is carried out manually.
By adopting the technical scheme, the final slope wall can be completely regular under manual finishing, unnecessary waste can not be generated when concrete is sprayed subsequently, the construction cost is reduced, and the structure is more stable.
Further setting the following steps: after each layer of earthwork is excavated, reinforcing steel bar sections are vertically driven into the slope wall of the earthwork at equal intervals before thin-wall concrete is sprayed on the slope wall.
Through adopting above-mentioned technical scheme, utilize the reinforcing bar section to make can be more audio-visual when spraying the concrete on the cliff the thickness of judgement concrete, and then make the thickness of concrete spraying more unanimous, make foundation ditch side slope level higher.
Further setting the following steps: before earthwork excavation, the ground surface is sprayed with concrete within 3m of the slope top of the foundation pit for hardening treatment, and a drainage ditch is arranged at a position 1m away from the slope shoulder of the foundation pit.
Through adopting above-mentioned technical scheme, harden to ground near the foundation ditch, when promoting near ground strength, the escape canal of seting up above that can collect surface water or rainwater, prevent in the follow-up inflow foundation ditch, infiltration in the foundation ditch simultaneously also can upwards be pumped to the escape canal and carry out quick drainage.
Further setting the following steps: the sprayed concrete is C20 fine aggregate concrete, the thickness of the concrete surface layer is 80-100mm, the water-cement ratio of the sprayed concrete is 0.40-0.45, the sand rate is 45-50%, and the weight ratio of cement to sand is 1: 4.5. The cement used for the sprayed concrete is 32.5-grade cement, and the maximum material diameter of the coarse inner material in the sprayed concrete is not more than 15 mm.
Further setting the following steps: the diameter of the bottom end of the supporting hole is larger than that of the upper portion of the supporting hole, and the bottom end of the reinforcing column is matched with the expanding head at the bottom end of the supporting hole.
Through adopting above-mentioned technical scheme for the reinforcement post bottom that forms of finally pouring in the porthole can be more stable in the soil layer of existing building foundation below, and then effectively supports the reinforcement to existing building, has abundant safety guarantee when making near foundation ditch excavation of existing building.
In conclusion, the beneficial technical effects of the invention are as follows:
(1) the existing building is supported by pouring the reinforcement column below the foundation of the existing building through the excavated lateral channel and the support hole, so that the pressure of the ground soil layer of the existing building is effectively reduced, the slope-releasing distance during excavation of the foundation pit is reduced, the foundation pit can be smoothly constructed, and meanwhile, excessive support structures are not needed;
(2) the construction and reinforcement are carried out in a layering manner in the foundation pit construction process, so that the stability of the whole foundation pit in construction is guaranteed;
(3) the reserved soil layer is used for manual finishing, inserting the steel bar sections and reinforcing the ground near the hardened foundation pit, so that the foundation pit is more convenient and quicker in the construction process and has good regularity.
Drawings
FIG. 1 is an overall process flow diagram of the present invention;
FIG. 2 is a process flow diagram of step A of the present invention;
FIG. 3 is a process flow diagram of step B of the present invention;
fig. 4 is a schematic diagram of the structural principle of the present invention.
Reference numerals: 1. a lateral channel; 2. a support hole; 3. reinforcing piles; 4. a drainage ditch; 5. existing buildings.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the invention discloses a construction process of a foundation pit adjacent to a building, which comprises the following steps:
referring to fig. 2 and 4, step a, existing building foundation reinforcement construction:
a1, measuring and positioning the edge position and the bottom depth of the foundation of the existing building 5;
a2, excavating a lateral channel 1 downwards, excavating the lateral channel 1 downwards from an outer soil layer of a foundation of an adjacent existing building 5 until the bottom surface of the lateral channel 1 is lower than that of the foundation of the existing building 5;
a3, digging a support hole 2 downwards, horizontally reaming the bottom of the bottom surface of the lateral channel 1 to the lower part of the foundation of the existing building 5, after horizontally reaming to the lower part of the existing building 5, vertically digging downwards deeply to form the support hole 2 with the aperture not smaller than 900mm, and making the opening part of the final support hole 2 be positioned at the outer side below the existing building 5 and the part be positioned below the existing building 5, and simultaneously reaming the bottom end of the support hole 2 to make the diameter of the bottom part be larger than that of the support hole 2 above the final support hole;
the bottom surface of the lateral channel 1 is arranged in a gradually inclined downward inclined plane in the direction close to the support hole 2, so that the opening of the lateral channel 1 and the support hole 2 at the communication position is larger;
a4, pouring the reinforcing piles 3, placing a plurality of reinforcement cages into the supporting holes 2 one by one, pouring concrete into the supporting holes 2 after the openings of the supporting holes 2 are extended by the stacked reinforcement cages, and after the lateral passages 1 with the same height on one side of the supporting holes 2 and the supporting holes 2 are filled, waiting for the concrete to harden to finally form the reinforcing piles 3.
The bottom end of the formed reinforcement column is matched with the expanded head arranged at the bottom end of the supporting hole 2, so that the bottom end of the reinforcement column which is finally poured in the supporting hole 2 can be more stable in a soil layer below the foundation of the existing building 5, and the existing building 5 is effectively supported and reinforced, so that sufficient safety guarantee is provided when a foundation pit near the existing building 5 is excavated.
Referring to fig. 3, step B, performing foundation pit excavation and foundation pit side wall reinforcement on the outer side of the building, and specifically including the following steps:
b1, excavating earthwork;
b2, spraying bottom layer concrete, and spraying concrete on the excavated side slope;
b3, carrying out anchor rod, soil nail and net hanging construction on the side slope;
b4, spraying surface layer concrete, and spraying concrete to the slope with the anchor rods and the hanging net.
It is worth mentioning that before the earth excavation, the ground within 3m of the slope shoulder of the foundation pit is sprayed with concrete for hardening treatment, the ground near the foundation pit is hardened, and a drainage ditch 4 is arranged at a position 1m away from the slope shoulder of the foundation pit, so that the drainage ditch 4 arranged on the ground can collect surface water or rainwater while improving the strength of the ground near the foundation pit, the subsequent inflow into the foundation pit is prevented, and meanwhile, the seepage water in the subsequent foundation pit can also be pumped upwards into the drainage ditch 4 for rapid drainage; and (C) during foundation pit construction, sequentially layering a plurality of layers of earthwork gradually downwards on the soil layer, and repeating the step (B) during construction of each layer of earthwork. And when the earthwork excavation of each layer is carried out in the step b1, a soil layer with the thickness of 10-20 cm is reserved on the surface of the slope wall of the earthwork, and the slope trimming is carried out manually, so that the final slope wall can be quite regular under manual trimming, unnecessary waste can not be generated during subsequent concrete spraying, the construction cost is reduced, and the structure is more stable. Meanwhile, between the steps b1 and b2, after each layer of earthwork is excavated, before the thin-wall concrete is sprayed on the slope wall, reinforcing steel bar sections are vertically driven into the slope wall of the earthwork at equal intervals, and the thickness of the concrete can be judged more visually when the concrete is sprayed on the slope wall by utilizing the reinforcing steel bar sections, so that the sprayed thickness of the concrete is more consistent; the sprayed concrete is C20 fine aggregate concrete, the thickness of the concrete surface layer is 80-100mm, the water-cement ratio of the sprayed concrete is 0.40-0.45, the sand rate is 45-50%, and the weight ratio of cement to sand is 1: 4.5. The cement used for the sprayed concrete is 32.5-grade cement, and the maximum material diameter of the coarse inner material in the sprayed concrete is not more than 15 mm.
The implementation principle and the beneficial effects of the embodiment are as follows: after measuring the foundation position of the existing building 5, a supporting hole 2 is formed from an excavating channel to the position under the foundation of the existing building 5, a reinforcing pile 3 is formed in the supporting hole 2 through pouring, and then the reinforcing pile 3 is used for supporting and stressing the existing building 5, so that the pressure on the earth surface of the existing building 5 and a shallow soil layer is smaller, at the moment, the required slope distance of a foundation pit during construction can be effectively reduced, and finally, when the foundation pit construction is carried out near the existing building 5, a strong supporting structure which is carried out in the foundation pit is not needed, and the effective area of the final foundation pit is guaranteed.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. A construction process of foundation pits adjacent to buildings is characterized by comprising the following steps:
step A, existing building foundation processing construction:
a1, measuring and positioning the foundation of the existing building;
a2, excavating a lateral channel downwards, and excavating the lateral channel downwards from an outer soil layer of an adjacent existing building foundation until the bottom surface of the lateral channel is lower than the bottom surface of the existing building foundation;
a3, digging support holes downwards, horizontally reaming the bottom of the bottom surface of the lateral channel below the existing building foundation, and vertically digging the lateral channel downwards deeply after reaming the bottom end of the lateral channel below the existing building foundation to form the support holes;
a4, pouring reinforcing piles, binding reinforcement cages on the inner walls of the supporting holes and pouring concrete into the supporting holes to form the reinforcing piles;
and step B, constructing the foundation pit, namely excavating the foundation pit and reinforcing the side wall of the foundation pit on the outer side of the building.
2. A process for constructing a foundation pit adjacent a structure as claimed in claim 1, wherein step B further comprises the steps of:
b1, excavating earthwork;
b2, spraying bottom layer concrete, and spraying concrete on the excavated side slope;
b3, carrying out anchor rod, soil nail and net hanging construction on the side slope;
b4, spraying surface layer concrete, and spraying concrete to the slope with the anchor rods and the hanging net.
3. A process according to claim 2, wherein the construction of a foundation pit adjacent a building comprises: and (C) during foundation pit construction, sequentially layering a plurality of layers of earthwork gradually downwards on the soil layer, and repeating the step (B) during construction of each layer of earthwork.
4. A process according to claim 2, wherein the construction of a foundation pit adjacent a building comprises: when each layer of earthwork is excavated, a soil layer with the thickness of 10-20 cm is reserved on the surface of the slope wall of the earthwork, and slope trimming is carried out manually.
5. A process according to claim 2, wherein the construction of a foundation pit adjacent a building comprises: after each layer of earthwork is excavated, reinforcing steel bar sections are vertically driven into the slope wall of the earthwork at equal intervals before thin-wall concrete is sprayed on the slope wall.
6. A process according to claim 5, wherein the construction of a foundation pit adjacent a building is as follows: before earthwork excavation, the ground surface is sprayed with concrete within 3m of the slope top of the foundation pit for hardening treatment, and a drainage ditch is arranged at a position 1m away from the slope shoulder of the foundation pit.
7. A process according to claim 2, wherein the construction of a foundation pit adjacent a building comprises: the sprayed concrete is C20 fine aggregate concrete, the thickness of the concrete surface layer is 80-100mm, the water-cement ratio of the sprayed concrete is 0.40-0.45, the sand rate is 45-50%, and the weight ratio of cement to sand is 1: 4.5; the cement used for the sprayed concrete is 32.5-grade cement, and the maximum material diameter of the coarse inner material in the sprayed concrete is not more than 15 mm.
8. A process according to claim 1, wherein the construction of a foundation pit adjacent a building comprises: the diameter of the bottom end of the supporting hole is larger than that of the upper portion of the supporting hole, and the bottom end of the reinforcing column is matched with the expanding head at the bottom end of the supporting hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454347.9A CN111549784A (en) | 2020-05-26 | 2020-05-26 | Construction process of foundation pit adjacent to building |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010454347.9A CN111549784A (en) | 2020-05-26 | 2020-05-26 | Construction process of foundation pit adjacent to building |
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| CN111549784A true CN111549784A (en) | 2020-08-18 |
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| CN202010454347.9A Pending CN111549784A (en) | 2020-05-26 | 2020-05-26 | Construction process of foundation pit adjacent to building |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112196299A (en) * | 2020-09-07 | 2021-01-08 | 中铁武汉勘察设计研究院有限公司 | Transformation method for additionally installing escalator on existing passenger tunnel |
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| JP2001098552A (en) * | 1999-09-30 | 2001-04-10 | Ohbayashi Corp | Unequal settlement preventive construction method for adjacent building in underground excavation work |
| CN1888331A (en) * | 2006-07-28 | 2007-01-03 | 谭新平 | Guide pit type manual pot holing pile reinforing and underpinning method for building foundation and composite supporting pile |
| CN105649089A (en) * | 2016-01-13 | 2016-06-08 | 江西博慧工程技术服务有限公司 | Construction method for excavating foundation pit close to existing shallow foundation protection structure |
| CN106592607A (en) * | 2017-03-13 | 2017-04-26 | 中国十七冶集团有限公司 | Steel bar embedding, net hanging and guniting supporting construction method of deep foundation pit |
| CN107700474A (en) * | 2017-10-27 | 2018-02-16 | 西安建筑科技大学 | A kind of existing construction foundation reinforcement means and campshed formula diaphram wall |
| CN207919602U (en) * | 2017-04-28 | 2018-09-28 | 高创建工股份有限公司 | Excavation of foundation pit closes on the supporting construction of existing shallow foundation |
| CN111155534A (en) * | 2020-01-18 | 2020-05-15 | 赵利 | Anchor-shotcreting support construction method in foundation pit construction |
-
2020
- 2020-05-26 CN CN202010454347.9A patent/CN111549784A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001098552A (en) * | 1999-09-30 | 2001-04-10 | Ohbayashi Corp | Unequal settlement preventive construction method for adjacent building in underground excavation work |
| CN1888331A (en) * | 2006-07-28 | 2007-01-03 | 谭新平 | Guide pit type manual pot holing pile reinforing and underpinning method for building foundation and composite supporting pile |
| CN105649089A (en) * | 2016-01-13 | 2016-06-08 | 江西博慧工程技术服务有限公司 | Construction method for excavating foundation pit close to existing shallow foundation protection structure |
| CN106592607A (en) * | 2017-03-13 | 2017-04-26 | 中国十七冶集团有限公司 | Steel bar embedding, net hanging and guniting supporting construction method of deep foundation pit |
| CN207919602U (en) * | 2017-04-28 | 2018-09-28 | 高创建工股份有限公司 | Excavation of foundation pit closes on the supporting construction of existing shallow foundation |
| CN107700474A (en) * | 2017-10-27 | 2018-02-16 | 西安建筑科技大学 | A kind of existing construction foundation reinforcement means and campshed formula diaphram wall |
| CN111155534A (en) * | 2020-01-18 | 2020-05-15 | 赵利 | Anchor-shotcreting support construction method in foundation pit construction |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112196299A (en) * | 2020-09-07 | 2021-01-08 | 中铁武汉勘察设计研究院有限公司 | Transformation method for additionally installing escalator on existing passenger tunnel |
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Application publication date: 20200818 |
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