CN113833024A - Basin-type excavation combined cover-excavation top-down construction method for water-rich deep and large foundation pit - Google Patents
Basin-type excavation combined cover-excavation top-down construction method for water-rich deep and large foundation pit Download PDFInfo
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- CN113833024A CN113833024A CN202111227986.2A CN202111227986A CN113833024A CN 113833024 A CN113833024 A CN 113833024A CN 202111227986 A CN202111227986 A CN 202111227986A CN 113833024 A CN113833024 A CN 113833024A
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- 238000010276 construction Methods 0.000 title claims abstract description 52
- 238000009412 basement excavation Methods 0.000 title claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000004567 concrete Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 3
- 238000000638 solvent extraction Methods 0.000 claims description 2
- 239000011150 reinforced concrete Substances 0.000 abstract description 5
- 238000009434 installation Methods 0.000 description 3
- 238000005527 soil sampling Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002002 slurry Substances 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
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
- E02D29/055—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
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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
- E02D19/08—Restraining of underground water by employing open ditches arranged below the level of the water
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a basin-type excavation combined cover-excavation top-down construction method for a water-rich deep and large foundation pit, which relates to the technical field of underground structural engineering construction, and comprises the following construction steps of: constructing a first-level underground continuous wall, an uplift pile and a main structure column from the ground; slope releasing and excavation of an underground layer of earthwork; constructing an underground layer of ring plate at the bottom of an underground layer, wherein the underground layer of ring plate comprises an underground layer of plate and a ring hole; excavating the underground second-layer earthwork; constructing an underground second floor at the bottom of the underground second floor; constructing a secondary underground continuous wall, an uplift pile and a main structure column below the underground second-layer floor; and excavating three underground layers of earthwork. The construction method of the basin-type excavation combined cover excavation top-down construction of the water-rich deep and large foundation pit is adopted, the plate is used for replacing the support, the deformation control of the enclosure structure is effectively guaranteed, meanwhile, the mounting and dismounting of a large number of reinforced concrete supports are reduced, and the cost is effectively saved.
Description
Technical Field
The invention relates to the field of underground structural engineering construction, in particular to a basin-type excavation and cover excavation combined top-down construction method for a water-rich deep and large foundation pit.
Background
Along with the development of economy and the acceleration of urbanization pace, underground structural engineering in China is increasing day by day, and the foundation pit construction can make full use of underground resources, so that the reconstruction and the development of large underground space become inevitable, and the method is widely applied to municipal water treatment structural engineering. The main process of deep foundation pit engineering construction is excavation of earthwork, and as municipal water treatment structure foundations are generally buried deeply, the construction area is wide, the earthwork engineering quantity of foundation pit excavation is large, and inconvenience is brought to earthwork excavation and transportation of a construction site. How to select a proper excavation scheme so as to ensure the safety quality of foundation pit excavation engineering on the premise of ensuring the requirement of the construction period becomes a problem concerned by construction technicians at present. The deep and large foundation pit adopts the problems of small construction field, large traffic pressure, tight construction period, complex geological conditions, high safety risk and the like faced by the traditional single open-cut forward-cut or cover-cut reverse construction method, so that the traditional single construction process is necessary to be further improved. For unfavorable hydrogeological conditions of weak strata and high underground water level, once the dangerous situation of water leakage of the enclosure joint occurs, the leakage stoppage work is extremely difficult, and risks are brought to the safety of the foundation pit and the surrounding environment.
Disclosure of Invention
The invention aims to solve the technical problem of providing a basin-type excavation combined cover excavation top-down construction method for a water-rich deep and large foundation pit, reducing the installation and dismantling of a large amount of reinforced concrete supports and effectively saving the cost.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the basin-type excavation combined cover excavation top-down construction method for the water-rich deep and large foundation pit comprises the following construction steps of:
the method comprises the following steps: constructing a first-level underground continuous wall, an uplift pile and a main structure column from the ground;
step two: slope releasing and excavation of an underground layer of earthwork;
step three: constructing an underground layer of ring plate at the bottom of an underground layer, wherein the underground layer of ring plate comprises an underground layer of plate and a ring hole;
step four: excavating the underground second-layer earthwork;
step five: constructing an underground second floor at the bottom of the underground second floor;
step six: constructing a secondary underground continuous wall, an uplift pile and a main structure column below the underground second-layer floor;
step seven: and excavating three underground layers of earthwork.
Further, in the fourth step, the underground second-layer earthwork is excavated, and the method comprises the following specific steps: partitioning an underground second layer, wherein earthwork corresponding to a ring hole in the underground second layer earthwork is an area I, the rest is an area II, and the area II is divided into a plurality of groups of symmetrical areas which are symmetrical relative to the area I, and one group of symmetrical areas comprises a symmetrical area I and a symmetrical area II; firstly, excavating earthwork in an area I; then respectively and sequentially excavating symmetrical areas, and when the symmetrical areas are excavated, simultaneously retreating and excavating the symmetrical areas I and II to the first-level underground continuous wall.
Furthermore, in the fifth step, a soil taking opening is reserved when the underground second floor is constructed.
Further, a drainage ditch is arranged on the ground.
Furthermore, a drainage ditch is arranged at the bottom of the underground layer.
Furthermore, the corner of the primary underground diaphragm wall and the corner of the secondary underground diaphragm wall are both provided with corner supports.
Further, in the first step, a connecting beam is arranged between the main structure columns.
Further, in step six, a connecting beam is arranged between the main structure columns.
Furthermore, the materials of the underground first-layer ring plate and the underground second-layer floor are all concrete.
The invention has the beneficial effects that:
1. the construction method of the basin-type excavation combined cover excavation top-down construction of the water-rich deep and large foundation pit is adopted, the plate is used for replacing the support, the deformation control of the enclosure structure is effectively guaranteed, meanwhile, the mounting and dismounting of a large number of reinforced concrete supports are reduced, and the cost is effectively saved.
2. The construction safety of the water-rich deep and large foundation pit is guaranteed, the diaphragm wall is constructed in a grading way, the bottom plate and the diaphragm wall form a water-stopping whole, and accidents such as water leakage of the enclosure joint, collapse of the foundation pit and the like are prevented;
3. the basin formula excavation sets up big opening at the foundation ditch middle part, reduces and covers earthwork quantity, can greatly promote the efficiency of construction, saves the time limit for a project.
Drawings
FIG. 1 is a sectional view of the construction of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a schematic representation of the underground second excavation of the present invention;
FIG. 4 is a schematic diagram of the invention for soil sampling of a subterranean zone;
FIG. 5 is a schematic structural view of a subterranean ring plate of the present invention;
shown in the figure: 1-ground; 2-first-level underground continuous wall; 3-uplift pile; 4-underground one layer; 5-underground one-layer ring plate; 501-underground one layer of plates; 502-annular ring; 6-underground two layers; 7-underground two-layer floor; 701-a soil sampling port; 8-underground three layers; 9-a drainage ditch; 10-corner brace; 11-a connecting beam; 12-main structure column 13-secondary underground continuous wall.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the basin-type excavation combined cover excavation top-down construction method for the water-rich deep and large foundation pit comprises a ground 1, an underground first layer 4, an underground second layer 6 and an underground third layer 8, wherein the size and the shape of the underground first layer 4, the underground second layer 6 and the underground third layer 8 are determined according to the actual needs of a pump room, and the construction method comprises the following construction steps:
the method comprises the following steps: constructing a primary underground continuous wall 2, uplift piles 3 and main structure columns 12 from the ground 1; constructing a first-level underground continuous wall on the ground, excavating a guide channel by adopting a crawler-type hydraulic grab bucket, forming a groove by adopting a reversed L-L shape in the form of the guide wall which is 20cm higher than the ground, forming the groove by using slurry to protect the wall, pouring underwater concrete after a reinforcing cage is hoisted, and constructing adjacent groove sections until a complete first-level underground continuous wall 2 is formed after the strength of the previous groove section reaches 70%; a plurality of uplift piles 3 and main structure columns 12 are arranged in an area surrounded by the primary underground continuous wall 2, after the pile positions are determined by measuring and paying off from the ground, holes are formed in the uplift piles 3 and the main structure columns 12 by adopting a rotary excavator, a reinforcement cage is hoisted in time, and underwater concrete is poured, so that the uplift piles 3 and the main structure columns 12 are formed, and the conventional construction method is known at present;
step two: slope releasing and excavation of a 4-layer underground earthwork; as shown in fig. 1, a slope is formed between the ground 1 and the bottom surface of the underground story 4 to facilitate subsequent construction and drainage.
Step three: constructing a first-layer ring plate 5 at the bottom of the first-layer underground 4, wherein the first-layer underground ring plate 5 comprises a first-layer underground plate 501 and a ring hole 502 as shown in fig. 5; the annular holes 502 are through holes, and the structure of the underground layer of annular plates 5 can be a supporting structure of concrete, steel plates, wood plates and the like.
Step four: excavating the 6 earthwork of the underground second layer; the second underground layer 6 is positioned below the first underground layer ring plate 5.
Step five: constructing an underground second floor 7 at the bottom of the underground second floor 6;
step six: constructing a secondary underground continuous wall 13, uplift piles 3 and main structure columns 12 below the underground second-layer floor 7; this step is similar to the first step, and in this embodiment, the secondary underground continuous wall 13 is enclosed into a circle, which enhances the stability of the structure.
Step seven: and excavating the three underground layers of 8 earthwork, wherein the excavated three underground layers of 8 earthwork are obviously positioned in the area surrounded by the two-level underground continuous wall 13. And after the underground three-layer 8 structure completely reaches the design strength, constructing the underground first, second and third side walls and the top plate to complete the construction of the whole deep and large foundation pit engineering.
The former construction of the water-rich deep and large foundation pit is that firstly, an underground three-layer 8 is directly excavated, then an underground two-layer 6 and an underground one-layer 4 are gradually built, similarly to the construction of a house from the ground, a large number of zero-hour supporting structures are needed, the building is needed before the construction, the dismantling is needed after the construction, and the financial resources, material resources and manpower are consumed, meanwhile, the time cost is high, compared with the former construction method of the water-rich deep and large foundation pit, the construction method of the invention replaces the supporting with the plate, the deformation control of the enclosure structure is effectively ensured, and simultaneously, the installation and dismantling of a large number of reinforced concrete supports are reduced, and the cost is effectively saved; meanwhile, the construction safety of the water-rich deep and large foundation pit is guaranteed, the underground diaphragm wall is constructed in a grading manner, the bottom plate and the underground diaphragm wall form a water-stopping whole, the underground first-layer annular plate 5, namely the underground second-layer floor 7 and the underground diaphragm wall form a water-stopping whole, and accidents such as water leakage of a retaining joint, collapse of the foundation pit and the like are prevented; the basin formula excavation sets up big opening at the foundation ditch middle part, reduces and covers earthwork quantity, can greatly promote the efficiency of construction, saves the time limit for a project.
In the fourth step, 6 earthwork of the underground second layer is excavated, and the concrete steps are as follows: dividing the underground second layer 6 into areas, wherein in the earthwork of the underground second layer 6, the earthwork corresponding to the annular hole 502 is an area I, the rest is an area II, and the area II is divided into a plurality of groups of symmetrical areas which are symmetrical relative to the area I, wherein one group of symmetrical areas comprises a symmetrical area I and a symmetrical area II; firstly, excavating earthwork in an area I; then respectively and sequentially excavating symmetrical areas, and when excavating the symmetrical areas, simultaneously retreating and excavating the symmetrical areas I and II to the first-level underground continuous wall 2. In this embodiment, as shown in fig. 3 specifically, 1 in the figure represents a region i, 2A, 2B, 3A, 3B, 4A, and 4B represent a region ii, where 2A and 2B are a first group of symmetric regions, 3A and 3B are a second group of symmetric regions, and 4A and 4B are a third group of symmetric regions, which are divided into three groups of symmetric regions in this embodiment, but may also be divided into four groups, five groups, and so on, where 2A and 2B represent symmetric regions i and ii of the first group of symmetric regions, the same regions 3A and 3B represent symmetric regions i and ii of the second group of symmetric regions, and 4A and 4B represent symmetric regions i and ii of the third group of symmetric regions, respectively, in this embodiment, the step of excavating the underground second layer 6 earthwork is to firstly perform core soil excavation of the central region 1; 2A, 2B areas are dug back to the continuous wall at the same time; thirdly, simultaneously backing and digging the 3A and 3B areas; fourthly, similarly, the areas 4A and 4B are dug back at the same time;
in the fifth step, a soil sampling port 701 is reserved when the underground second floor 7 is constructed. As shown in fig. 4, the underground second floor 7 is a whole bottom plate, so as to conveniently dig the earthwork of the underground third floor 8 and ensure the stability of the whole structure of the underground second floor 7, and an earth taking opening 701 is reserved, that is, the earth taking opening 701 is reserved while the underground second floor 7 is constructed.
Foundation ditch drainage's mode is many, for example adopt tub well precipitation, draw water, set up the escape canal etc. in this embodiment, for the convenience foundation ditch drainage, ground 1 is provided with escape canal 9.
Similarly, the bottom of the underground layer 4 is provided with a drainage ditch 9.
In order to ensure the stability of the underground continuous wall structure, the corner of the first-level underground continuous wall 2 and the corner of the second-level underground continuous wall 13 are both provided with corner supports 10.
In step one, a connecting beam 11 is arranged between the main structure columns 12. The concrete construction steps are that after the pile position is determined by measuring and paying off from the ground, a rotary excavator is adopted to carry out uplift pile and main structure column 12 pore-forming, a reinforcement cage is hoisted in time and underwater concrete is poured, after the strength of the concrete reaches 100%, a groove is formed to construct a connecting beam 11, and the verticality of the main structure column 12 is ensured;
in step six, a connecting beam 11 is arranged between the main structure columns 12. Also, a connection beam 11 is provided to ensure the verticality and stability of the main structural column 12.
The material of the first underground layer annular plate 5 and the second underground layer floor 7 can be concrete, steel plates, wood plates and other supporting structures, and in the embodiment, in order to ensure the stability of the whole structure and prolong the service life, the material of the first underground layer annular plate 5 and the second underground layer floor 7 is concrete. The bottom of the second underground layer 6 and the bottom of the third underground layer 8 are constructed with the first layer of concrete as a partition plate and a support plate, which are similar to floor plates of a house, so that the first underground layer ring plate 5 and the second underground layer floor 7 are combined with the underground continuous wall into a whole, the stability of the whole structure is improved, accidents such as water leakage of the enclosure joint, collapse of a foundation pit and the like are prevented, meanwhile, a large number of reinforced concrete supports are reduced, the installation and the removal are realized, and the cost is effectively saved.
Claims (9)
1. The utility model provides a deep big foundation ditch basin formula excavation of rich water combines to cover and digs reverse construction method, includes ground (1), two layers (6) and underground three-layer (8) in one-tenth underground (4), its characterized in that: the method comprises the following construction steps:
the method comprises the following steps: constructing a primary underground continuous wall (2), uplift piles (3) and main structural columns (12) from the ground (1);
step two: slope is released to excavate an underground layer (4) of earthwork;
step three: constructing an underground layer ring plate (5) at the bottom of an underground layer (4), wherein the underground layer ring plate (5) comprises an underground layer plate (501) and a ring hole (502);
step four: excavating the earth of the underground second layer (6);
step five: constructing an underground second floor (7) at the bottom of the underground second floor (6);
step six: constructing a secondary underground continuous wall (13), uplift piles (3) and main structural columns (12) below the underground second-layer floor (7);
step seven: and excavating the three underground layers (8) of earthwork.
2. The basin-type excavation combined cover-excavation top-down construction method for the water-rich deep and large foundation pit according to claim 1, characterized in that: in the fourth step, the second underground layer (6) earthwork is excavated, and the concrete steps are as follows: partitioning the underground second layer (6), wherein earthwork corresponding to the annular hole (502) in the earthwork of the underground second layer (6) is an I area, the rest is an II area, and the II area is divided into a plurality of groups of symmetrical areas which are symmetrical relative to the I area, wherein one group of symmetrical areas comprises a symmetrical I area and a symmetrical II area; firstly, excavating earthwork in an area I; then, symmetrical areas are respectively and sequentially excavated, and when the symmetrical areas are excavated, the symmetrical area I and the symmetrical area II are simultaneously excavated to the first-level underground continuous wall (2).
3. The basin-type excavation combined cover-excavation top-down construction method for the water-rich deep and large foundation pit according to claim 1 or 2, characterized in that: in the fifth step, a soil taking opening (701) is reserved when the underground second-layer floor (7) is constructed.
4. The basin-type excavation combined cover-excavation top-down construction method for the water-rich deep and large foundation pit according to claim 3, characterized in that: the ground (1) is provided with a drainage ditch (9).
5. The basin-type excavation combined cover-excavation top-down construction method for the water-rich deep and large foundation pit according to claim 4, characterized in that: and a drainage ditch (9) is arranged at the bottom of the underground layer (4).
6. The basin-type excavation combined cover-excavation top-down construction method for the water-rich deep and large foundation pit according to claim 5, characterized in that: and corner supports (10) are arranged at the corner of the first-level underground continuous wall (2) and the corner of the second-level underground continuous wall (13).
7. The basin-type excavation combined cover-excavation top-down construction method for the water-rich deep and large foundation pit according to claim 6, characterized in that: in the first step, a connecting beam (11) is arranged between the main structure columns (12).
8. The basin-type excavation combined cover-excavation top-down construction method for the water-rich deep and large foundation pit according to claim 7, characterized in that: in the sixth step, a connecting beam (11) is arranged between the main structure columns (12).
9. The basin-type excavation combined cover-excavation top-down construction method for the water-rich deep and large foundation pit according to claim 8, characterized in that: the materials of the underground first-layer ring plate (5) and the underground second-layer floor (7) are all concrete.
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| CN202111227986.2A CN113833024A (en) | 2021-10-21 | 2021-10-21 | Basin-type excavation combined cover-excavation top-down construction method for water-rich deep and large foundation pit |
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| CN202111227986.2A CN113833024A (en) | 2021-10-21 | 2021-10-21 | Basin-type excavation combined cover-excavation top-down construction method for water-rich deep and large foundation pit |
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Citations (5)
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|---|---|---|---|---|
| JP2000257089A (en) * | 1999-03-08 | 2000-09-19 | Okumura Corp | Construction method of underground structure |
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-
2021
- 2021-10-21 CN CN202111227986.2A patent/CN113833024A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000257089A (en) * | 1999-03-08 | 2000-09-19 | Okumura Corp | Construction method of underground structure |
| CN1948633A (en) * | 2005-10-14 | 2007-04-18 | 上海市第七建筑有限公司 | Tray type excarvating contrary construction method |
| CN103741714A (en) * | 2013-12-09 | 2014-04-23 | 中国建筑第二工程局有限公司 | Full-cover excavation top-down construction method for underground engineering |
| CN106320377A (en) * | 2016-08-31 | 2017-01-11 | 中铁二局工程有限公司 | Water-rich soft soil area deep foundation pit cover and excavation top-down construction method |
| CN107938701A (en) * | 2017-11-23 | 2018-04-20 | 上海建科工程咨询有限公司 | Subway station covered back-digging overlapping wall construction technology based on prefabricated ground-connecting-wall |
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| Title |
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| 梁向湘等: "地铁车站超大超深基坑盆式开挖结合盖挖逆作法施工关键技术研究", 《第十七届中国科协年会-分7 综合轨道交通体系学术沙龙论文集》 * |
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Address after: No. 350, Renmin Street, East District, Panzhihua City, Sichuan Province, 617099 Applicant after: CHINA 19TH METALLURGICAL GROUP Co.,Ltd. Address before: 617099 China 19th Metallurgical Group Co.,Ltd., Bingcaogang, East District, Panzhihua City, Sichuan Province Applicant before: CHINA 19TH METALLURGICAL GROUP Co.,Ltd. |
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Application publication date: 20211224 |
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