CN113718782A - Secondary excavation and support construction method for deep foundation pit - Google Patents
Secondary excavation and support construction method for deep foundation pit Download PDFInfo
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- CN113718782A CN113718782A CN202111002095.7A CN202111002095A CN113718782A CN 113718782 A CN113718782 A CN 113718782A CN 202111002095 A CN202111002095 A CN 202111002095A CN 113718782 A CN113718782 A CN 113718782A
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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
-
- 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
- E02D19/10—Restraining of underground water by lowering level of ground water
-
- 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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
-
- 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
- E02D19/22—Lining sumps in trenches or other foundation pits
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a secondary excavation and supporting construction method for a deep foundation pit. The invention adopts common excavating equipment and transport vehicles, adopts natural stable slope ratio, only needs simple support, reasonably utilizes the space of an excavation site, by temporarily building the construction access of the excavating equipment and the excavating material transfer point on the slope surface of the foundation pit, a plurality of excavating equipment can convey excavated materials out of the foundation pit while alternately carrying out relay excavation, the construction cost is low, meanwhile, the splicing type supporting structure has high erection and dismantling speed, the lower-layer earthwork can be directly excavated without waiting for strength after the erection is finished, but also can recycle, can the sizing in addition, application scope is wide, and the triangle-shaped support frame makes this supporting construction have higher structural strength moreover, and the guard plate of L type can pass through the support frame with the horizontal power that the curb plate received to bottom plate department, and the atress is more even, sets up safety problems such as domatic slump when the step can effectively avoid excavating in the domatic setting up of foundation ditch.
Description
Technical Field
The invention relates to the technical field of building foundation pit construction, in particular to a secondary excavation and supporting construction method for a deep foundation pit.
Background
When the building foundation pit is constructed, in order to ensure the construction safety and prevent collapse accidents, support measures are required to be taken for the excavated building foundation pit, the factors of engineering geology and hydrogeology conditions, foundation pit types, excavation depth of the foundation pit, drainage conditions, requirements of peripheral environment on the displacement of the side wall of the foundation pit, peripheral load of the foundation pit, construction season, service life of a support structure and the like are comprehensively considered in the support design and construction of the building foundation pit, reasonable design, elaborate construction, economic safety are achieved, along with the construction of a large number of high-rise buildings and the development of underground space, and meanwhile, in order to meet the structural requirements of high-rise buildings such as earthquake resistance, wind resistance and the like, the basement is developed into multiple layers from one layer, the corresponding excavation depth of the foundation pit is increased, along with the increase of the depth of the foundation pit, the instability probability of a support structure in the foundation pit is increased, and the problem of low success rate of the foundation pit engineering in China is highlighted, each big city has an example of an engineering accident of a built foundation pit, when a deeper deep foundation pit is arranged on the side close to the edge of the deep foundation pit, the periphery of the deeper deep foundation pit is close to an important building, so a reasonable construction method is adopted for earth excavation and supporting on the side close to the edge, the construction of large-area foundations of other deep foundation pits is not influenced, and an effective construction method is not available at present.
Disclosure of Invention
The invention aims to provide a secondary excavation and supporting construction method for a deep foundation pit, which has the advantages of good stabilizing effect and high construction efficiency and solves the problems of poor stabilizing effect and low construction efficiency of the conventional method.
In order to achieve the purpose, the invention provides the following technical scheme:
a secondary excavation method for a deep foundation pit comprises the following steps:
s1: clearing and treating underground and overground obstacles in a construction area according to the requirements of a construction scheme, and measuring and setting out the range of the foundation pit to be dug;
s2: driving retaining wall piles downwards along the side wall of the foundation pit to be dug, driving rotary jet piles into the intervals of the retaining wall piles after adjacent retaining wall piles are driven at intervals, and forming the water stop continuous wall;
s3: constructing a well point, arranging wide water dispersion slope protection around a foundation pit, intercepting surface water into an open ditch in a field, precipitating for three times, entering an urban underground water channel, forming a water collecting ditch at the side of a brick moulding bed at the bottom of the foundation pit, excavating water collecting wells at two ends of the water collecting ditch, and draining the foundation pit by adopting a power water pump;
s4: placing slopes according to the designed slope ratio according to the actual condition of foundation pit excavation and layering, arranging steps between every two layers, arranging excavating equipment on the slope surface and the slope top of the foundation pit, and distributing the excavating equipment along the height of the slope surface;
s5: and (4) carrying out support treatment in time after each layer of excavation is finished, carrying out excavation on the next layer after the previous layer of support is finished, and circularly repeating the steps until the preset depth of secondary excavation is reached.
A supporting construction method for secondary excavation of a deep foundation pit is characterized by comprising the following steps: the method comprises the following steps:
s1: inserting a support column into the inner side wall of the secondary foundation pit;
s2: two adjacent support columns are fixedly connected with a protection plate through bolts;
s3: one side of the protection plate, which is far away from the inner wall of the foundation pit, is fixedly connected with a support frame through bolts;
s4: the bottom of the support frame is fixedly connected with the inner side of the protection plate through a bolt.
Preferably, the top end of the retaining wall pile in the step S2 is flush with the ground or higher than the ground, and the top end of the jet grouting pile is higher than the groundwater level by more than one meter.
Preferably, in step S4, the intersection of the effective working ranges of the excavating devices is set at the intersection, so that the excavating devices located relatively below can deliver the excavated materials within the working ranges to the intersection, and the excavating devices located relatively above relay the excavated materials to deliver the excavated materials, so that the excavating devices relay each other to transport the excavated materials to the outside of the foundation pit and excavate the excavation layer by layer according to the designed slope ratio.
Preferably, in step S4, the layering requirement is that each layer has a depth of three to four meters, and the width of the step is not less than three meters.
Preferably, a digging material storage yard is arranged near the position of the side slope edge of the foundation pit, and the distance between the storage yard and the side slope edge of the foundation pit is not less than twenty meters.
Preferably, the power water pump in step S3 may be a motor pump, an electric pump, a vacuum pump, or a siphon pump, and the power water pump should be selected according to the technical performance of the power water pump, and the number and model of the power water pump are determined according to the actual water volume.
Preferably, in the excavation process of the foundation pit in the step S4, in the earthwork which can not be excavated by the mechanical construction, excavation should be performed at any time in cooperation with manual work, and soil is transported to the place where the machine is excavated by a hand truck so as to be excavated by the machine in time.
Preferably, the shape of the shielding plate in the step S2 is an L-shape, and the shape of the supporting frame in the step S3 is a triangle.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts common excavating equipment and transport vehicles, adopts natural stable slope ratio, only needs simple support, reasonably utilizes the space of an excavation site, by temporarily building the construction access of the excavating equipment and the excavating material transfer point on the slope surface of the foundation pit, a plurality of excavating equipment can convey excavated materials out of the foundation pit while alternately carrying out relay excavation, the construction cost is low, meanwhile, the splicing type supporting structure has high erection and dismantling speed, the lower-layer earthwork can be directly excavated without waiting for strength after the erection is finished, but also can recycle, can the sizing in addition, application scope is wide, and the triangle-shaped support frame makes this supporting construction have higher structural strength moreover, and the guard plate of L type can pass through the support frame with the horizontal power that the curb plate received to bottom plate department, and the atress is more even, sets up safety problems such as domatic slump when the step can effectively avoid excavating in the domatic setting up of foundation ditch.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that:
a secondary excavation method for a deep foundation pit comprises the following steps:
s1: clearing and treating underground and overground obstacles in a construction area according to the requirements of a construction scheme, and measuring and setting out the range of the foundation pit to be dug;
s2: driving retaining wall piles downwards along the side wall of the foundation pit to be dug, driving rotary jet piles into the intervals of the retaining wall piles after adjacent retaining wall piles are driven at intervals, and forming the water stop continuous wall;
s3: constructing a well point, arranging wide water dispersion slope protection around a foundation pit, intercepting surface water into an open ditch in a field, precipitating for three times, entering an urban underground water channel, forming a water collecting ditch at the side of a brick moulding bed at the bottom of the foundation pit, excavating water collecting wells at two ends of the water collecting ditch, and draining the foundation pit by adopting a power water pump;
s4: placing slopes according to the designed slope ratio according to the actual condition of foundation pit excavation and layering, arranging steps between every two layers, arranging excavating equipment on the slope surface and the slope top of the foundation pit, and distributing the excavating equipment along the height of the slope surface;
s5: and (4) carrying out support treatment in time after each layer of excavation is finished, carrying out excavation on the next layer after the previous layer of support is finished, and circularly repeating the steps until the preset depth of secondary excavation is reached.
A supporting construction method for secondary excavation of a deep foundation pit is characterized by comprising the following steps: the method comprises the following steps:
s1: inserting a support column into the inner side wall of the secondary foundation pit;
s2: two adjacent support columns are fixedly connected with a protection plate through bolts;
s3: one side of the protection plate, which is far away from the inner wall of the foundation pit, is fixedly connected with a support frame through bolts;
s4: the bottom of the support frame is fixedly connected with the inner side of the protection plate through a bolt.
The first embodiment is as follows:
s1: clearing and treating underground and overground obstacles in a construction area according to the requirements of a construction scheme, and measuring and setting out the range of the foundation pit to be dug; a digging material storage yard is arranged near the edge of the foundation pit side slope, and the distance between the storage yard and the edge of the foundation pit side slope is twenty meters;
s2: driving retaining wall piles downwards along the side wall of the foundation pit to be dug, driving rotary jet piles into the intervals of the retaining wall piles after adjacent retaining wall piles are driven into the intervals of the retaining wall piles to form a water-stopping continuous wall, wherein the top ends of the retaining wall piles are flush with the ground, and the top ends of the rotary jet piles are higher than the ground water level by one meter;
s3: constructing a well point, arranging wide water dispersion slope protection around a foundation pit, intercepting surface water into an open ditch in a field, precipitating for three times, entering an urban underground water channel, forming a water collecting ditch at the side of a brick moulding bed at the bottom of the foundation pit, excavating water collecting wells at two ends of the water collecting ditch, and draining the foundation pit by adopting a power water pump; the power water pump is a motor pump;
s4: placing slopes according to a designed slope ratio according to the actual condition of foundation pit excavation and layering, arranging steps between every two layers, wherein the layering depth is three meters, the step width is three meters, arranging excavating equipment on the slope surface and the slope top of the foundation pit, distributing a plurality of excavating equipment along the height of the slope surface, intersecting effective operation ranges of the excavating equipment, and arranging an excavating material transfer point at the intersection, so that the excavating equipment relatively positioned below can convey excavating materials in the operation ranges to the excavating material transfer point, and the excavating equipment relatively positioned above relays to convey the excavating materials out of the foundation pit, and thus, the excavating equipment relays to convey the excavating materials to the outside of the foundation pit and excavate in layers according to the designed slope ratio;
s5: the processing of in time strutting after every layer of excavation is accomplished, inserts the support column to the inside wall of secondary foundation ditch now, and two adjacent support columns pass through bolt fixedly connected with guard plate, and bolt fixedly connected with support frame is passed through to one side that the foundation ditch inner wall was kept away from to the guard plate, and the inboard fixed connection of bolt and guard plate is passed through to the bottom of support frame, and the excavation of carrying out the next floor again after accomplishing is strutted by the last layer, so circulate reciprocal until the predetermined degree of depth of secondary excavation.
Example two:
in the first embodiment, the following steps are added:
the depth of layering is four meters, and the width of the step is four meters.
S1: clearing and treating underground and overground obstacles in a construction area according to the requirements of a construction scheme, and measuring and setting out the range of the foundation pit to be dug; a digging material storage yard is arranged near the edge of the foundation pit side slope, and the distance between the storage yard and the edge of the foundation pit side slope is twenty meters;
s2: driving retaining wall piles downwards along the side wall of the foundation pit to be dug, driving rotary jet piles into the intervals of the retaining wall piles after adjacent retaining wall piles are driven into the intervals of the retaining wall piles to form a water-stopping continuous wall, wherein the top ends of the retaining wall piles are flush with the ground, and the top ends of the rotary jet piles are higher than the ground water level by one meter;
s3: constructing a well point, arranging wide water dispersion slope protection around a foundation pit, intercepting surface water into an open ditch in a field, precipitating for three times, entering an urban underground water channel, forming a water collecting ditch at the side of a brick moulding bed at the bottom of the foundation pit, excavating water collecting wells at two ends of the water collecting ditch, and draining the foundation pit by adopting a power water pump; the power water pump is a motor pump;
s4: placing slopes according to a designed slope ratio according to the actual condition of foundation pit excavation and layering, arranging steps between every two layers, arranging excavating equipment on the slope surface and the slope top of the foundation pit, enabling the excavating equipment to be distributed along the height of the slope surface, enabling the effective operating ranges of the excavating equipment to intersect, and arranging an excavating material transfer point at the intersection, so that the excavating equipment which is relatively positioned below can send excavating materials in the operating ranges to the excavating material transfer point, and the excavating equipment which is relatively positioned above can transfer the excavating materials out in a relay mode, and thus, the excavating equipment can transfer the excavating materials to the outside of the foundation pit in a relay mode and excavate in a layered mode according to the designed slope ratio;
s5: the processing of in time strutting after every layer of excavation is accomplished, inserts the support column to the inside wall of secondary foundation ditch now, and two adjacent support columns pass through bolt fixedly connected with guard plate, and bolt fixedly connected with support frame is passed through to one side that the foundation ditch inner wall was kept away from to the guard plate, and the inboard fixed connection of bolt and guard plate is passed through to the bottom of support frame, and the excavation of carrying out the next floor again after accomplishing is strutted by the last layer, so circulate reciprocal until the predetermined degree of depth of secondary excavation.
Example three:
in the second embodiment, the following steps are added:
the top end of the retaining pile is higher than the ground, and the top end of the jet grouting pile is two meters higher than the ground water level; .
S1: clearing and treating underground and overground obstacles in a construction area according to the requirements of a construction scheme, and measuring and setting out the range of the foundation pit to be dug; a digging material storage yard is arranged near the edge of the foundation pit side slope, and the distance between the storage yard and the edge of the foundation pit side slope is twenty meters;
s2: driving retaining wall piles downwards along the side wall of the foundation pit to be dug, driving rotary jet piles into the intervals of the retaining wall piles after adjacent retaining wall piles are driven at intervals, and forming the water stop continuous wall;
s3: constructing a well point, arranging wide water dispersion slope protection around a foundation pit, intercepting surface water into an open ditch in a field, precipitating for three times, entering an urban underground water channel, forming a water collecting ditch at the side of a brick moulding bed at the bottom of the foundation pit, excavating water collecting wells at two ends of the water collecting ditch, and draining the foundation pit by adopting a power water pump; the power water pump is a motor pump;
s4: placing slopes according to a designed slope ratio according to the actual condition of foundation pit excavation and layering, arranging steps between every two layers, wherein the layering depth is three meters, the step width is three meters, arranging excavating equipment on the slope surface and the slope top of the foundation pit, distributing a plurality of excavating equipment along the height of the slope surface, intersecting effective operation ranges of the excavating equipment, and arranging an excavating material transfer point at the intersection, so that the excavating equipment relatively positioned below can convey excavating materials in the operation ranges to the excavating material transfer point, and the excavating equipment relatively positioned above relays to convey the excavating materials out of the foundation pit, and thus, the excavating equipment relays to convey the excavating materials to the outside of the foundation pit and excavate in layers according to the designed slope ratio;
s5: the processing of in time strutting after every layer of excavation is accomplished, inserts the support column to the inside wall of secondary foundation ditch now, and two adjacent support columns pass through bolt fixedly connected with guard plate, and bolt fixedly connected with support frame is passed through to one side that the foundation ditch inner wall was kept away from to the guard plate, and the inboard fixed connection of bolt and guard plate is passed through to the bottom of support frame, and the excavation of carrying out the next floor again after accomplishing is strutted by the last layer, so circulate reciprocal until the predetermined degree of depth of secondary excavation.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A secondary excavation method for a deep foundation pit is characterized by comprising the following steps: the method comprises the following steps:
s1: clearing and treating underground and overground obstacles in a construction area according to the requirements of a construction scheme, and measuring and setting out the range of the foundation pit to be dug;
s2: driving retaining wall piles downwards along the side wall of the foundation pit to be dug, driving rotary jet piles into the intervals of the retaining wall piles after adjacent retaining wall piles are driven at intervals, and forming the water stop continuous wall;
s3: constructing a well point, arranging wide water dispersion slope protection around a foundation pit, intercepting surface water into an open ditch in a field, precipitating for three times, entering an urban underground water channel, forming a water collecting ditch at the side of a brick moulding bed at the bottom of the foundation pit, excavating water collecting wells at two ends of the water collecting ditch, and draining the foundation pit by adopting a power water pump;
s4: placing slopes according to the designed slope ratio according to the actual condition of foundation pit excavation and layering, arranging steps between every two layers, arranging excavating equipment on the slope surface and the slope top of the foundation pit, and distributing the excavating equipment along the height of the slope surface;
s5: and (4) carrying out support treatment in time after each layer of excavation is finished, carrying out excavation on the next layer after the previous layer of support is finished, and circularly repeating the steps until the preset depth of secondary excavation is reached.
2. A supporting construction method for secondary excavation of a deep foundation pit is characterized by comprising the following steps: the method comprises the following steps:
s1: inserting a support column into the inner side wall of the secondary foundation pit;
s2: two adjacent support columns are fixedly connected with a protection plate through bolts;
s3: one side of the protection plate, which is far away from the inner wall of the foundation pit, is fixedly connected with a support frame through bolts;
s4: the bottom of the support frame is fixedly connected with the inner side of the protection plate through a bolt.
3. The secondary excavation method for the deep foundation pit according to claim 1, characterized in that: and step S2, the top end of the retaining pile is flush with the ground or higher than the ground, and the top end of the jet grouting pile is higher than the ground water level by more than one meter.
4. The secondary excavation method for the deep foundation pit according to claim 1, characterized in that: in the step S4, the intersection of the effective working ranges of the excavating devices is set, and a material digging transfer point is set at the intersection, so that the excavating devices located relatively below can send the excavated materials within the working ranges to the material digging transfer point, and the excavating devices located relatively above relay the excavated materials to send out, so that the excavating devices relay each other to transport the excavated materials to the outside of the foundation pit and excavate in layers according to the designed slope ratio.
5. The secondary excavation method for the deep foundation pit according to claim 1, characterized in that: in step S4, the layering requirements are that the depth of each layer is three to four meters, and the width of the step is not less than three meters.
6. The secondary excavation method for the deep foundation pit according to claim 1, characterized in that: and a digging material storage yard is arranged at a position near the edge of the foundation pit side slope, and the distance between the storage yard and the edge of the foundation pit side slope is not less than twenty meters.
7. The secondary excavation method for the deep foundation pit according to claim 1, characterized in that: in the step S3, the power water pumps may be a motor pump, an electric pump, a vacuum pump, and a siphon pump, and should be selected according to the technical performance of the power water pumps, and the number and model of the power water pumps are determined according to the actual water amount.
8. The secondary excavation method for the deep foundation pit according to claim 1, characterized in that: in the process of excavating the foundation pit in the step S4, earthwork which can not be excavated by mechanical construction is excavated at any time by matching with manual work, and soil is transported to a place where the machine is excavated by a hand truck so as to be excavated by the machine in time.
9. The support construction method for the secondary excavation of the deep foundation pit according to claim 2, characterized in that: the shape of the shielding plate in the step S2 is L-shaped, and the shape of the supporting frame in the step S3 is triangular.
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| CN202111002095.7A CN113718782A (en) | 2021-08-30 | 2021-08-30 | Secondary excavation and support construction method for deep foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111002095.7A CN113718782A (en) | 2021-08-30 | 2021-08-30 | Secondary excavation and support construction method for deep foundation pit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967015A (en) * | 2014-05-21 | 2014-08-06 | 刘绍国 | Water-stopping deep foundation pit excavation method and structure thereof |
| CN110106886A (en) * | 2019-04-04 | 2019-08-09 | 徐晔 | A kind of deep pit digging method of underground high water level |
| CN110924399A (en) * | 2019-11-11 | 2020-03-27 | 中国电建集团华东勘测设计研究院有限公司 | Deep foundation pit earthwork excavation method |
| WO2020173100A1 (en) * | 2019-02-26 | 2020-09-03 | 济南轨道交通集团有限公司 | Reinforcement apparatus and construction method for local freezing reinforcement of deep foundation pit in water-rich sand gravel stratum |
| CN211713976U (en) * | 2019-12-10 | 2020-10-20 | 中铁建大桥工程局集团南方工程有限公司 | Large-span foundation pit supporting structure |
-
2021
- 2021-08-30 CN CN202111002095.7A patent/CN113718782A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967015A (en) * | 2014-05-21 | 2014-08-06 | 刘绍国 | Water-stopping deep foundation pit excavation method and structure thereof |
| WO2020173100A1 (en) * | 2019-02-26 | 2020-09-03 | 济南轨道交通集团有限公司 | Reinforcement apparatus and construction method for local freezing reinforcement of deep foundation pit in water-rich sand gravel stratum |
| CN110106886A (en) * | 2019-04-04 | 2019-08-09 | 徐晔 | A kind of deep pit digging method of underground high water level |
| CN110924399A (en) * | 2019-11-11 | 2020-03-27 | 中国电建集团华东勘测设计研究院有限公司 | Deep foundation pit earthwork excavation method |
| CN211713976U (en) * | 2019-12-10 | 2020-10-20 | 中铁建大桥工程局集团南方工程有限公司 | Large-span foundation pit supporting structure |
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Application publication date: 20211130 |