CN114892674A - Foundation pit supporting structure close to existing building and construction method thereof - Google Patents
Foundation pit supporting structure close to existing building and construction method thereof Download PDFInfo
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- CN114892674A CN114892674A CN202210590676.5A CN202210590676A CN114892674A CN 114892674 A CN114892674 A CN 114892674A CN 202210590676 A CN202210590676 A CN 202210590676A CN 114892674 A CN114892674 A CN 114892674A
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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
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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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
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Abstract
The application relates to a foundation pit supporting structure close to an existing building, which comprises a foundation pit close to the existing building, wherein a supporting structure is arranged on one side, close to the existing building, of the side wall of the foundation pit, and a first reinforcing structure used for reinforcing a soil layer between the supporting structure and the existing building is arranged between the supporting structure and a basement of the existing building; this application has the constructor of being convenient for to carry out the advantage of being under construction near the foundation ditch of existing building.
Description
Technical Field
The application relates to the field of building construction, in particular to a foundation pit supporting structure close to an existing building and a construction method thereof.
Background
The foundation pit support is a retaining, reinforcing and protecting measure adopted for the side wall of the foundation pit and the surrounding environment in order to ensure the safety of the construction of an underground structure and the surrounding environment of the foundation pit; in recent years, urban rail transit railway stations are more and more, existing buildings in cities are more and more, the construction conditions beside the existing buildings are more and more, the construction positions of part of foundation pits are difficult to avoid being close to the existing buildings around, and the problem that construction is inconvenient due to the fact that the existing buildings are close to one side of a foundation pit support close to the existing buildings at present is often caused.
Disclosure of Invention
First aspect, in order to improve and closes on the stability of existing building excavation supporting lateral wall, this application provides one kind and closes on existing building excavation supporting construction.
The application provides a close on existing building foundation ditch supporting construction adopts following technical scheme:
the utility model provides a close on existing building excavation supporting construction, is including closing on the foundation ditch of existing building, the foundation ditch lateral wall just is located one side near existing building and is provided with supporting construction, be provided with between supporting construction and the basement of existing building and be used for the first reinforced structure to the soil layer reinforcement between supporting construction and the existing building.
By adopting the technical scheme, the supporting structure can play a role in supporting the side wall of the foundation pit, prevent the collapse of the side wall of the foundation pit close to the existing building due to instability, and improve the stability of the foundation pit close to the side wall of the existing building; the soil layer between supporting construction and the existing building can be strengthened to the setting of first reinforced structure to further improved the stability of foundation ditch, be located the basement of existing building and process the soil layer, the construction operation is abundant, and it is convenient to construct, has practiced thrift the cost of construction, has shortened the cycle of construction.
Optionally, the supporting construction includes a plurality of campshed, and is a plurality of the campshed sets up in the foundation ditch lateral wall and is close to one side of existing building.
Through adopting above-mentioned technical scheme, it is convenient to adopt its construction of mode that the campshed was strutted, and is better to the effect of strutting of foundation ditch lateral wall.
Optionally, a crown beam is arranged at the top of the plurality of row piles, and the crown beam is used for connecting the plurality of row piles into a whole.
Through adopting above-mentioned technical scheme, adopt the setting up of hat roof beam to make a plurality of campsheds form a whole, improved the atress effect of a plurality of campsheds to the effect of strutting of a plurality of campsheds to the foundation ditch lateral wall has indirectly been improved.
Optionally, first reinforced structure is including setting up a plurality of slip casting pipes in the soil horizon between foundation ditch lateral wall and existing building, the one end of slip casting pipe sets up to be used for inserting the end of inserting in the soil horizon, and the other end sets up to be used for the slip casting end to the intraductal slip casting of slip casting, a plurality of grout outlet has been seted up on the lateral wall of slip casting pipe.
By adopting the technical scheme, when a soil layer between the foundation pit and the existing building needs to be reinforced, the grouting pipe is arranged in the soil layer, the cement slurry is conveyed towards the grouting pipe along the grouting end, the cement slurry in the grouting pipe can flow out along the slurry outlet hole, the cement slurry flows into a gap of the soil layer due to pressure, and after the cement slurry is cured, the cement slurry has a curing effect on a coating between the foundation pit and the existing building; the grouting pipe is simple in structure and convenient to construct, and the soil layer reinforcing effect between the foundation pit and the existing building is improved.
Optionally, a second reinforcing structure for further improving the supporting force of the row piles on the side wall of the foundation pit is arranged between the row piles and the existing building.
Through adopting above-mentioned technical scheme, the setting up of second reinforced structure has further improved the effect of strutting of a plurality of campshed to the foundation ditch lateral wall.
Optionally, the second reinforcing structure includes a plurality of anchor cables arranged on the side wall of the foundation pit along the horizontal direction, the anchor cables are arranged between the row piles and the existing building, and a plurality of groups of anchor cables are arranged along the height direction of the side wall of the foundation pit.
Through adopting above-mentioned technical scheme, adopt the setting of anchor rope, through exerting prestressing force to the anchor rope, make the anchor rope drive a plurality of campshed and exert pressure towards the direction of existing building, thereby further improved the effect of strutting of a plurality of campshed to the foundation ditch lateral wall, a plurality of campsheds can drive the soil layer between foundation ditch and the existing building and be in the state that compresses tightly this moment, thereby further improve the wholeness of soil layer between foundation ditch and the existing building soil layer, the mechanical properties of soil layer has been improved, the displacement of soil layer has been effectively controlled.
Optionally, the foundation pit supporting structure further comprises a connecting member for connecting together a plurality of anchor lines of the same group.
Through adopting above-mentioned technical scheme, the setting of connecting piece can drive a plurality of anchor cables of every group and become a whole to make a plurality of anchor cables further improve the effect of strutting to a plurality of campshed.
Optionally, the connecting piece includes a plurality of purlins that enclose, and every group is a plurality of the anchor rope corresponds to two enclose the purlin, and the one end of a plurality of anchor ropes of same group wears to establish and fixed connection on one of them encloses the purlin, and the other end wears to establish and fixed connection another enclose on the purlin.
Through adopting above-mentioned technical scheme, enclose setting up of purlin and can link together a plurality of anchor ropes of organizing to improved and driven a plurality of campshed to the effect of strutting of foundation ditch to a plurality of anchor ropes, adopt to enclose its simple structure of setting up of purlin, improved the connection effect that is connected to a plurality of anchor ropes together.
In a second aspect, the application provides a construction method for a foundation pit supporting structure close to an existing building, in order to improve stability of the foundation pit supporting side wall close to the existing building.
The application provides a close to existing building foundation ditch supporting construction method adopts following technical scheme:
a construction method for closing to an existing building foundation pit supporting structure comprises the following steps:
s1, grouting pipe construction, wherein a constructor is positioned on the ground and between a foundation pit to be excavated and an existing building, the constructor is positioned on the ground and provided with a hole along the vertical direction, a grouting pipe is inserted into the hole, the grouting pipe is positioned between the foundation pit and the existing building, grout is injected towards the grouting end of the grouting pipe on the ground between the foundation pit and the existing building, the grout flows into a gap of a soil layer along a grout outlet of the grouting pipe, and the side wall of the foundation pit and the soil layer of the existing building are reinforced;
s2: constructing row piles and crown beams, vertically drilling holes at the positions, close to the side walls of the existing building, of a foundation pit, hoisting a reinforcement cage into the holes, pouring concrete into the holes to form the row piles, forming a plurality of row piles by repeating the steps, erecting a pouring template at the end parts, located outside the ground, of the row piles, enabling the end parts, located outside the ground, of the row piles to be located in the pouring template, pouring concrete into the pouring template, forming the crown beams after the concrete is cured, and enabling the crown beams to connect the row piles together;
s3: the foundation ditch construction, carry out the layering excavation construction to the foundation ditch according to the degree of depth of foundation ditch excavation, at first excavate the first layer of foundation ditch, along enclosing the purlin, the underground chamber of row stake and existing building between soil layer orientation existing building is drilled, send into downthehole both ends to the anchor rope of anchor rope and be under construction respectively, make anchor rope and soil layer form a whole through pouring cement mortar, then set up and enclose the purlin, drive the anchor rope and pass the enclosing purlin of both sides, and exert the pulling force to the anchor rope, accomplish the foundation ditch excavation construction of first layer, realize the multilayer excavation construction of foundation ditch through repeating above-mentioned step.
By adopting the technical scheme, the existing building is used as a fulcrum, the traditional limited anchor cable single-row pile support can be adopted, meanwhile, due to the existence of the basement, the construction or anchor rod construction operation space is sufficient, the construction is convenient and fast, and meanwhile, a detachable anchor cable structure can be adopted, so that the cost is further saved, and the construction period is shortened; and the mode of adopting anchor rope row pile to strut through being located in the basement has improved the effect of strutting of a plurality of row piles to the foundation ditch, has improved the wholeness and the stability of the soil layer between foundation ditch and the existing building, prevents that the soil layer between foundation ditch and the existing building from appearing collapsing.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the supporting structure can play a role in supporting the side wall of the foundation pit, prevent the side wall of the foundation pit close to the existing building from collapsing due to instability, and improve the stability of the foundation pit close to the side wall of the existing building; the arrangement of the first reinforcing structure can reinforce the soil layer between the supporting structure and the existing building, so that the stability of the foundation pit is further improved, the first reinforcing structure is positioned in the underground chamber of the existing building to process the soil layer, the construction operation is sufficient, the construction is convenient and fast, the construction cost is saved, and the construction period is shortened;
2. when a soil layer between the foundation pit and the existing building needs to be reinforced, the grouting pipe is arranged in the soil layer, cement slurry is conveyed towards the grouting pipe along the grouting end, the cement slurry in the grouting pipe can flow out along the slurry outlet hole, the cement slurry flows into a gap of the soil layer due to pressure, and after the cement slurry is cured, the cement slurry has a curing effect on a coating between the foundation pit and the existing building; the grouting pipe is simple in structure and convenient to construct, and the soil layer reinforcing effect between the foundation pit and the existing building is improved;
3. the anchor cable is arranged, prestress is applied to the anchor cable, the anchor cable drives the row piles to apply pressure towards the direction of the existing building, the supporting effect of the row piles on the side wall of the foundation pit is further improved, the row piles can drive the soil layer between the foundation pit and the existing building to be in a compression state, the integrity of the soil layer between the foundation pit and the existing building soil layer is further improved, the mechanical property of the soil layer is improved, and displacement of the soil layer is effectively controlled.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.
Description of reference numerals: 1. a foundation pit; 11. a first reinforcing structure; 12. pile arrangement; 13. an anchor cable; 14. and (7) enclosing purlins.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
The embodiment of the application discloses a supporting structure close to an existing building foundation pit 1. Referring to fig. 1, a foundation pit supporting structure near an existing building comprises a foundation pit 1 near the existing building, and in the embodiment, the foundation pit 1 is vertically arranged near the side wall of the existing building.
As shown in fig. 1, in order to reinforce the coating between the foundation pit 1 and the existing building, a first reinforcing structure 11 for reinforcing a soil layer between the supporting structure and the existing building is arranged between the supporting structure and the basement of the existing building; first reinforced structure 11 is including setting up a plurality of slip casting pipes (not shown in the figure) in the soil horizon between foundation ditch 1 lateral wall and existing building, and the slip casting pipe level sets up in the soil horizon, and the one end of slip casting pipe sets up to be used for inserting the end of inserting in the soil horizon, and the other end sets up to be used for the slip casting end of the intraductal slip casting of slip casting, has seted up a plurality of grout outlet on the lateral wall of slip casting pipe.
When the grouting pipe is in construction, firstly, a hole is drilled in the underground room of the existing building towards the position of the foundation pit 1, the grouting pipe is arranged in the hole, grouting is performed by adopting a grouting end closed static pressure type grouting method, cement slurry can flow out along a slurry outlet hole in the grouting pipe, and therefore the cement slurry enters a gap in a soil layer, and the soil layer is reinforced.
As shown in fig. 1, a supporting structure is arranged on one side of the side wall of the foundation pit 1, which is close to the existing building; the supporting structure comprises a plurality of row piles 12, wherein the row piles 12 are arranged on one side, close to the existing building, of the side wall of the foundation pit 1; the row piles 12 are concrete cast piles, the tops of the row piles 12 are provided with crown beams (not shown in the figure), the crown beams are used for connecting the row piles 12 into a whole, and the crown beams are also formed by pouring concrete; firstly, constructing the row piles 12, drilling holes in the positions of the side walls of the foundation pit 1 preset on the ground by a drilling machine, manufacturing reinforcement cages on construction sites, hoisting the reinforcement cages into the drilled holes by a crane, grouting towards the pile holes to form the row piles 12, after the plurality of row piles 12 are cured, erecting rectangular pouring templates at the end parts of the plurality of row piles 12 positioned outside the ground, enabling the plurality of row piles 12 to be positioned in the rectangular pouring templates, conveying concrete towards the pouring templates, forming crown beams after curing, and detaching the pouring templates to enable the crown beams to connect the plurality of row piles 12 side by side into a whole.
As shown in fig. 1, in order to further improve the supporting effect of the plurality of row piles 12 on the side wall of the foundation pit 1, a second reinforcing structure for further improving the supporting force of the row piles 12 on the side wall of the foundation pit 1 is arranged between the row piles 12 and the existing building; the second reinforcing structure comprises a plurality of anchor cables 13 arranged on the side wall of the foundation pit 1 along the horizontal direction, the anchor cables 13 are arranged between the row piles 12 and the existing building, and a plurality of groups of anchor cables 13 are arranged along the height direction of the side wall of the foundation pit 1; in this embodiment, the anchor cable 13 is horizontally disposed between the sidewall of the foundation pit 1 and the basement of the existing building, and in other embodiments, the anchor cable 13 may be replaced by an anchor rod.
When anchor rope 13 construction needs to be carried out, anchor rod machine drilling can be adopted, impurity in the drilling hole is washed after drilling is finished, the anchor rod is placed to the inside of the hole, cement mortar is injected into the inside of the hole, anchor rope 13 and the soil layer form a whole, tensioning locking is carried out on anchor rope 13 after cement mortar is solidified, and installation of anchor rope 13 is achieved.
As shown in fig. 1, in order to connect together a same set of a plurality of anchor lines 13, the excavation supporting structure further comprises a connecting member for connecting together a same set of a plurality of anchor lines 13; the connecting piece comprises a plurality of surrounding purlins 14, each group of the anchor cables 13 corresponds to two surrounding purlins 14, one end of each group of the anchor cables 13 penetrates through and is fixedly connected to one surrounding purlin 14, and the other end of each group of the anchor cables 13 penetrates through and is fixedly connected to the other surrounding purlin 14; in the present embodiment, the purlin 14 is provided as a steel beam; the plurality of anchor cables 13 in the same group can be fixed by penetrating the plurality of anchor cables 13 through the same steel beam.
A construction method for closing to an existing building foundation pit supporting structure comprises the following steps:
s1, grouting pipe construction, wherein a constructor is positioned on the ground and between a foundation pit 1 to be excavated and an existing building, the constructor is positioned on the ground and provided with a hole along the vertical direction, and a grouting pipe is inserted into the hole, so that the grouting pipe is positioned between the foundation pit 1 and the existing building, grout is injected towards the grouting end of the grouting pipe on the ground between the foundation pit 1 and the existing building, the grout flows into a gap of a soil layer along a grout outlet of the grouting pipe, and the side wall of the foundation pit 1 and the soil layer of the existing building are reinforced;
s2: the method comprises the following steps of constructing row piles 12 and crown beams, drilling holes in the position, close to the side wall of an existing building, of a foundation pit 1 vertically by a drilling machine, hoisting a reinforcement cage into the holes through a crane, injecting concrete into the holes to form the row piles 12, repeating the steps to form a plurality of row piles 12, erecting a pouring template at the end parts, located outside the ground, of the row piles 12, enabling the end parts, located outside the ground, of the row piles 12 to be located in the pouring template, injecting concrete into the pouring template, forming the crown beams after the concrete is cured, and enabling the crown beams to connect the row piles 12 together;
s3: foundation ditch 1 construction, carry out the layering excavation construction to foundation ditch 1 according to the degree of depth of foundation ditch 1 excavation, at first excavate the first layer of foundation ditch 1, along enclosing purlin 14, adopt stock machine drilling towards the underground chamber of existing building in row stake 12 and the soil layer between the existing building, send into anchor rope 13 downthehole to anchor rope 13 both ends construction respectively, make anchor rope 13 and soil layer form a whole through pouring cement mortar, then set up and enclose purlin 14, drive anchor rope 13 and pass both sides and enclose purlin 14, and exert the pulling force to anchor rope 13, accomplish the foundation ditch 1 excavation construction of first layer, realize the multilayer excavation construction of foundation ditch 1 through repeating above-mentioned step.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. The utility model provides a close on existing building foundation ditch supporting construction which characterized in that: including closing on foundation ditch (1) of existing building, foundation ditch (1) lateral wall just is located one side near existing building and is provided with supporting construction, be provided with between supporting construction and the basement of existing building and be used for the first reinforced structure (11) of soil layer reinforcement between supporting construction and the existing building.
2. A retaining structure for an excavation adjacent an existing building as claimed in claim 1, wherein: the supporting structure comprises a plurality of row piles (12), and the row piles (12) are arranged on one side, close to the existing building, of the side wall of the foundation pit (1).
3. A support structure for an adjacent existing building foundation pit according to claim 2, wherein: and the top of the row piles (12) is provided with a crown beam which is used for connecting the row piles (12) into a whole.
4. A support structure for an adjacent existing building foundation pit according to claim 3, wherein: first reinforced structure (11) are including setting up a plurality of slip casting pipes in the soil horizon between foundation ditch (1) lateral wall and existing building, the one end of slip casting pipe sets up to inserting the end for inserting in the soil horizon, and the other end sets up to the slip casting end that is used for to the intraductal slip casting of slip casting, a plurality of grout outlet holes have been seted up on the lateral wall of slip casting pipe.
5. An adjacent existing building foundation pit supporting structure as claimed in claim 4, wherein: and a second reinforcing structure for further improving the supporting force of the row piles (12) to the side wall of the foundation pit (1) is arranged between the row piles (12) and the existing building.
6. An adjacent existing building foundation pit supporting structure as claimed in claim 5, wherein: the second reinforced structure includes along a plurality of anchor ropes (13) of horizontal direction setting on foundation ditch (1) lateral wall, anchor rope (13) set up between campshed (12) and existing building, and a plurality of anchor ropes (13) are provided with the multiunit along the direction of height of foundation ditch (1) lateral wall.
7. An adjacent existing building foundation pit supporting structure as claimed in claim 6, wherein: the excavation supporting structure further comprises a connector for connecting together a plurality of anchor lines (13) of the same group.
8. An adjacent existing building foundation pit supporting structure as claimed in claim 7, wherein: the connecting piece includes a plurality of purlins (14) of enclosing, and every group is a plurality of anchor rope (13) are corresponding to two enclose purlin (14), and the one end of a plurality of anchor rope (13) of same group is worn to establish and fixed connection and is on one of them encloses purlin (14), and the other end is worn to establish and fixed connection and is another enclose on purlin (14).
9. A construction method for a supporting structure close to an existing building foundation pit is characterized by comprising the following steps: including the adjacent existing building excavation supporting structure of claim 8, including the steps of:
s1, grouting pipe construction, wherein a constructor is positioned on the ground and between a foundation pit (1) to be excavated and an existing building, the constructor is positioned on the ground and provided with a hole along the vertical direction, the grouting pipe is inserted into the hole, so that the grouting pipe is positioned between the foundation pit (1) and the existing building, grout is injected towards the grouting end of the grouting pipe on the ground between the foundation pit (1) and the existing building, the grout flows into a gap of a soil layer along a grout outlet of the grouting pipe, and the side wall of the foundation pit (1) and the soil layer of the existing building are reinforced;
s2: constructing row piles (12) and crown beams, vertically drilling holes at the positions, close to the side walls of the existing building, of a foundation pit (1), hanging a reinforcement cage into the holes, injecting concrete into the holes to form the row piles (12), forming a plurality of row piles (12) by repeating the steps, erecting a pouring template at the end parts, located outside the ground, of the row piles (12), enabling the end parts, located outside the ground, of the row piles (12) to be located in the pouring template, injecting the concrete into the pouring template, and forming the crown beams after the concrete is cured so that the row piles (12) are connected together by the crown beams;
s3: foundation pit (1) construction, carry out the layering excavation construction to foundation pit (1) according to the degree of depth of foundation pit (1) excavation, at first excavate the first layer of foundation pit (1), along enclosing purlin (14), row stake (12) and the soil layer orientation underground indoor drilling of existing building between row stake (12) and the existing building, send into anchor rope (13) downthehole to the both ends of anchor rope (13) construction respectively, make anchor rope (13) and soil layer form a whole through pouring cement mortar, then set up enclosing purlin (14), drive anchor rope (13) and pass enclosing purlin (14) of both sides, and exert pulling force to anchor rope (13), accomplish foundation pit (1) excavation construction of first layer, realize the multilayer excavation construction of foundation pit (1) through repeating above-mentioned step.
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| CN202210590676.5A CN114892674A (en) | 2022-05-27 | 2022-05-27 | Foundation pit supporting structure close to existing building and construction method thereof |
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| CN202210590676.5A CN114892674A (en) | 2022-05-27 | 2022-05-27 | Foundation pit supporting structure close to existing building and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118166783A (en) * | 2024-02-02 | 2024-06-11 | 北京建工四建工程建设有限公司 | Construction method for active foundation reinforcement comprehensive support between new and old buildings |
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| CN212641473U (en) * | 2020-07-01 | 2021-03-02 | 中建一局集团第三建筑有限公司 | Foundation pit supporting structure adjacent to existing building |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118166783A (en) * | 2024-02-02 | 2024-06-11 | 北京建工四建工程建设有限公司 | Construction method for active foundation reinforcement comprehensive support between new and old buildings |
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