CN115419074B - Crawler-type soil conveying and excavating method for ultra-deep foundation pit - Google Patents
Crawler-type soil conveying and excavating method for ultra-deep foundation pit Download PDFInfo
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- CN115419074B CN115419074B CN202211189619.2A CN202211189619A CN115419074B CN 115419074 B CN115419074 B CN 115419074B CN 202211189619 A CN202211189619 A CN 202211189619A CN 115419074 B CN115419074 B CN 115419074B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
-
- 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
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F7/00—Equipment for conveying or separating excavated material
- E02F7/02—Conveying equipment mounted on a dredger
Abstract
The invention provides a crawler-type soil transfer and excavation method for an ultra-deep foundation pit, which comprises drawing deepening; cleaning surface soil; constructing a first support, and reserving a temporary lateral support; the soil conveying and excavating device vertically conveys and excavates the opposite support and the angle support; monitoring a foundation pit; excavating the middle part of a foundation pit, and loading and transporting the foundation pit outside; and backfilling earthwork. The crawler-type rapid soil conveying and excavating method is adopted in the deep foundation pit exceeding 5 meters, the circumferential positions of the opposite supporting area and the corner support area in the deep foundation pit are deepened in advance and comprehensively integrated, and meanwhile, the ramp form in the foundation pit is improved and optimized, so that the crawler-type rapid soil conveying and excavating method successfully realizes the application of crawler-type rapid soil conveying and excavating in the ultra-deep foundation pit.
Description
Technical Field
The invention relates to the technical field of foundation pit transmission excavation, in particular to a crawler-type transmission excavation method for an ultra-deep foundation pit.
Background
Typically, deep foundation pit refers to a project where the depth of excavation exceeds 5 meters (including 5 meters), or where the depth is not more than 5 meters, but where the geological conditions and surrounding environment and underground piping are particularly complex.
In the construction process of the deep foundation pit, the deep foundation pit is generally excavated section by section in a layered manner, and the adoption of the method can easily cause frequent replacement of transportation roads in the foundation pit, so that the construction period and the mechanical use cost are increased. Meanwhile, secondary pollution of dust is easily caused on one hand by repeated transmission digging of the digging machine, and meanwhile, the efficiency of earth excavation is low due to repeated transportation. On the other hand, the foundation pit excavation is accompanied with the problems of potential safety hazard, difficulty in control of foundation pit deformation and the like. Therefore, a novel construction method is needed to solve the problems of low earth excavation efficiency, dust pollution, foundation pit deformation control and the like.
Disclosure of Invention
Aiming at the prior art, the invention provides a crawler-type soil conveying and excavating method for an ultra-deep foundation pit.
The invention provides a crawler-type soil conveying and excavating method for an ultra-deep foundation pit, which comprises the following steps of:
s1, deepening a drawing: analyzing the supporting area, geological conditions and foundation pit ramp arrangement conditions in the deep foundation pit according to the drawing of the deep foundation pit, and obtaining data of the inner angle support, the opposite support and the first support elevation and the second support elevation of the foundation pit; determining and optimizing the positions and the number of the earth transfer and excavation arrangements, and determining the positions of corresponding foundation pit slopes; determining the excavation sequence and the flow direction in the foundation pit;
s2, surface soil cleaning: cleaning vegetation, garbage and barriers of an excavated area;
s3, first-pass support construction and temporary lateral support reservation: digging the ground by adopting a digging machine to form a primary digging pit, carrying out first-pass vertical support beam construction in the primary digging pit, and arranging a plurality of temporary lateral supports on the vertical support beam;
s4, the soil conveying and excavating device vertically conveys and excavates the support and the angle support: the crawler-type soil conveying and excavating device comprises a soil excavating mechanism and a conveying mechanism, wherein the soil excavating mechanism comprises a mast and a conveying and excavating rod, the mast and the conveying and excavating rod are vertically arranged, the mast and the tower crane can be connected in a vertical moving mode, the conveying and excavating rod and the mast can be connected in a vertical moving mode, a crawler is arranged on the conveying and excavating rod, one side of the crawler is provided with a soil conveying cylinder, the bottom of the soil conveying cylinder is provided with a straight excavating bucket, the side part of the soil conveying cylinder is provided with a plurality of closable soil outlets, and the upper part of each soil outlet is provided with a movable dust cover; the conveying mechanism comprises a base, and a soil conveying belt is arranged on the base;
when the construction of the support and the angle brace is carried out, the whole soil digging mechanism is conveyed into the primary pit through a tower crane, the transfer digging rod is moved, the crawler belt is rotated, soil on the inner side of the vertical support beam is vertically dug through the straight digging bucket and is brought into the soil conveying cylinder, the whole soil digging mechanism is moved through the tower crane, the soil conveying cylinder is driven to the position above the soil conveying belt outside the foundation pit, the soil outlet is opened, the soil in the soil conveying cylinder obliquely falls onto the soil conveying belt, and the soil is conveyed into a slag car on one side of the soil conveying belt through the soil conveying belt; along with the increase of depth, the crawler-type soil conveying and excavating device is insufficient in transverse rigidity, and the soil conveying cylinder is supported through the first layer and the subsequent temporary lateral supports to ensure the stability of the transverse rigidity of the excavating mechanism;
s5, monitoring a foundation pit;
s6, excavating the middle part of the foundation pit and loading and transporting the foundation pit outside: in an ultra-deep foundation pit, carrying out earthwork excavation on a first layer and a second layer of earthwork of a land block in a slope-releasing mode, carrying out construction support after the first layer and the second layer of earthwork are excavated from a gusset area to a lower layer elevation, then carrying out earthwork excavation and support construction on a supporting area in sequence, carrying out soil sampling on the middle part of the foundation pit in a concentrated mode by using a hydraulic grab trestle, comprehensively considering post-pouring belt division of a bottom plate in the third layer of earthwork excavation, excavating from a position far away from an earth outlet end to an outlet direction, and carrying out centralized loading and outward transportation by using a long-arm excavator;
s7, backfilling earthwork: timely backfilling and compacting plain soil between the outer wall and the surrounding supporting system after the basement roof is constructed; backfilling earthwork or stacking sand bags at the bottom of the foundation pit, grouting at the bottom of the pit, and externally adding a misplaced pipe into the pit and grouting for reinforcement.
Preferably, in S3, when the earth is excavated by the excavator, the excavation depth is controlled to a depth less than the design depth by half a meter, the remaining depth is manually excavated, and the final depth is controlled to a depth less than the design depth by 0.2 meter, thereby forming an initial pit, and the diameter of the initial pit is controlled to 2 meters.
Preferably, in S4, the mast and the tower crane are movably connected up and down through a pulley frame.
Preferably, in S4, the digging transfer rod and the mast are movably connected up and down through a guide rail.
Preferably, in S4, the soil conveying belt is rotatable.
Preferably, in S5, the specific method for foundation pit monitoring is as follows: a. measuring the horizontal displacement and sedimentation of the top of the supporting structure: 1 observation point is distributed every 20-25m along the top surface of the ring beam; b. deep horizontal displacement: when the inclinometer pipe is buried in the soil, the depth of the inclinometer pipe is not less than the depth of the underground continuous wall; when buried in the underground continuous wall, the depth is the same as that of the underground continuous wall; c. and (3) observing the underground water level: the observation well dynamically observes the underground water level outside the pit, the alarm value is 0.5m/d of change rate, and the accumulated change value is 2m; d. measuring the supporting shaft force: 9-29 supports are selected for each layer of reinforced concrete supports of the first layer, the second layer and the third layer of the land, and a reinforced concrete support axial force measurement is carried out by adopting a reinforced concrete dynamometer; e. monitoring the internal force of the underground wall: the method comprises the steps that a ground continuous wall is selected in the middle of the periphery of a foundation pit for internal force monitoring, steel bar stress meters are adopted for measurement, a group of measuring points are respectively arranged at each wall at intervals of 4m elevation, and 2 steel bar meters are arranged on each section; f. measuring the settlement of the support column: selecting a plurality of upright posts at the positions of the support rods at the intersection points to set a settlement observation point, wherein the total number of the settlement observation points is not less than 20%; g. road pavement: setting an observation point every 25 meters along the road adjacent to the foundation pit range; h. measurement of horizontal and vertical displacement of other underground pipelines: at the nodes, corner points and locations of greater deformation curvature of the pipeline.
Compared with the prior art, the invention has the beneficial effects that: the crawler-type rapid soil conveying and excavating method is adopted in the deep foundation pit exceeding 5 meters, the circumferential positions of the opposite supporting area and the corner support area in the deep foundation pit are deepened in advance and comprehensively integrated, and meanwhile, the ramp form in the foundation pit is improved and optimized, so that the crawler-type rapid soil conveying and excavating method successfully realizes the application of crawler-type rapid soil conveying and excavating in the ultra-deep foundation pit.
Drawings
FIG. 1 is a schematic flow chart of a crawler-type earth-moving method for ultra-deep foundation pit.
Fig. 2 is a schematic structural view of a crawler-type soil-shifting device according to an embodiment of the present invention.
In the figure, 1, a vertical supporting beam; 2. temporary lateral support; 3. a mast; 4. a digging transmission rod; 5. a tower crane; 6. a pulley frame; 7. a guide rail; 8. a track; 9. an earth moving cylinder; 10. a straight bucket; 11. a soil outlet; 12. a base; 13. a soil conveying belt.
Detailed Description
In order to facilitate understanding of the technical means, the creation characteristics, the achievement of the purposes and the effects provided by the present invention, the technical solution of the present invention is described in detail below, but the scope of protection of the present invention is not limited to the embodiments.
The invention provides a crawler-type soil conveying and excavating method for ultra-deep foundation pits, which is shown in figures 1 and 2 and comprises the following steps:
s1, deepening a drawing: analyzing the supporting area, geological conditions and foundation pit ramp arrangement conditions in the deep foundation pit according to the drawing of the deep foundation pit, and obtaining data of the inner angle support, the opposite support and the first support elevation and the second support elevation of the foundation pit; determining and optimizing the positions and the number of the arrangement of the soil conveying and excavating devices, and determining the positions of corresponding foundation pit slopes; determining the excavation sequence and the flow direction in the foundation pit; according to the main body structural design condition and the design of the soil outlet channel in the excavation process, the space-time effect rule is fully considered: according to the principles of partition, block, layering, symmetry and balance, excavation points are planned around a foundation pit, in particular to a corner brace and a pair of supports, adverse effects of foundation pit deformation, earthwork collapse and the like caused by uneven force transmission distribution of soil in the foundation pit due to vertical transmission earth excavation are avoided, the transverse embedded parts on the side walls of the supporting beams are designed to be laid so as to stabilize the vertical stability of the crawler-type transmission earth excavation device, intercepting ditches are arranged before foundation pit earth excavation and supporting beam construction, rainwater and ground open water are prevented from entering a pit, damage to a pit bottom soil layer is avoided, uneven subsidence is generated during supporting construction, and the quality is influenced;
s2, surface soil cleaning: the vegetation, garbage and barriers in the excavated area are cleaned, original mature trees are reserved as far as possible, and the mature trees to be cut must have supervision or special indication of the owner units;
s3, first-pass support construction and temporary lateral support reservation: excavating the ground by adopting an excavator, controlling the excavation depth to be less than the design depth by half a meter, manually excavating the residual depth, and controlling the final depth to be less than the design depth by 0.2 meter to form a primary pit, wherein the diameter of the primary pit is controlled to be 2 meters; carrying out first-pass vertical support beam 1 construction in the primary pit, and arranging temporary lateral supports 2 at the upper, middle and lower positions of the vertical support beam 1;
s4, the soil conveying and excavating device vertically conveys and excavates the support and the angle support: the earth excavation in the foundation pit is strictly executed according to the working condition required by the design, so that the temporary lateral support 2 made of reinforced concrete is constructed in time after the excavation is carried out to the bottom elevation of the vertical support beam 1, the unsupported exposure time, width and depth during the excavation of the foundation pit are reduced, and the deformation of surrounding facilities caused by the excavation of the foundation pit is controlled within an allowable range; when the first layer and the subsequent earthwork are excavated, the earthwork about 10m is reserved at the foundation pit edge and used as a stress buffer area, so that the influence on surrounding buildings is reduced;
as shown in fig. 2, the crawler-type soil conveying and excavating device comprises a soil excavating mechanism and a conveying mechanism, wherein the soil excavating mechanism comprises a mast 3 and a conveying and excavating rod 4, the mast 3 and the conveying and excavating rod 4 are vertically arranged, the mast 3 and a tower crane 5 can be connected in a vertical moving way through a pulley frame 6, a first driving device is arranged on the pulley frame 6 and used as the power for the vertical movement of the mast 3, the conveying and excavating rod 4 and the mast 3 can be connected in a vertical moving way through a guide rail 7, a second driving device is arranged on the guide rail 7 and used as the power for the vertical movement of the conveying and excavating rod 4, a crawler 8 is arranged on a vertical surface of the conveying and excavating rod 4, one side of the crawler 8 is provided with a soil conveying cylinder 9, the bottom of the soil conveying cylinder 9 is provided with a straight excavating bucket 10, the side part of the soil conveying cylinder 9 is provided with a plurality of closable soil outlets 11 from top to bottom, and the upper part of the soil outlets 11 is provided with a movable dust cover; the conveying mechanism comprises a base 12, and a rotatable soil conveying belt 13 is arranged on the base 12 so as to receive the excavated soil conveyed by the excavating mechanism from different directions;
when the construction of the support and the angle brace is carried out, the whole soil excavating mechanism is conveyed into the primary pit through the tower crane 5, the transmission excavating rod 4 is moved, the crawler belt 8 is rotated, the soil on the inner side of the vertical support beam 1 is vertically excavated through the straight excavating bucket 10 and is brought into the soil conveying cylinder 9, the whole soil excavating mechanism is moved through the tower crane 5, the soil conveying cylinder 9 is driven to be above the soil conveying belt 13 outside the foundation pit, the soil outlet 11 is opened, the excavated soil in the soil conveying cylinder 9 obliquely falls onto the soil conveying belt 13, and the excavated soil is conveyed into the residue soil vehicle on one side of the soil conveying belt 13 through the soil conveying belt 13; along with the increase of depth, the crawler-type soil conveying and excavating device is insufficient in transverse rigidity, and the soil conveying cylinder 9 is supported through the first layer and the subsequent temporary lateral support 2 to ensure the stability of the transverse rigidity of the excavating mechanism;
s5, foundation pit monitoring: a. measuring the horizontal displacement and sedimentation of the top of the supporting structure: 1 observation point is distributed every 20-25m along the top surface of the ring beam; b. deep horizontal displacement: when the inclinometer pipe is buried in the soil, the depth of the inclinometer pipe is not less than the depth of the underground continuous wall; when buried in the underground continuous wall, the depth is the same as that of the underground continuous wall; c. and (3) observing the underground water level: the observation well dynamically observes the underground water level outside the pit, the alarm value is 0.5m/d of change rate, and the accumulated change value is 2m; d. measuring the supporting shaft force: 9-29 supports are selected for each layer of reinforced concrete supports of the first layer, the second layer and the third layer of the land, and a reinforced concrete support axial force measurement is carried out by adopting a reinforced concrete dynamometer; e. monitoring the internal force of the underground wall: the method comprises the steps that a ground continuous wall is selected in the middle of the periphery of a foundation pit for internal force monitoring, steel bar stress meters are adopted for measurement, a group of measuring points are respectively arranged at each wall at intervals of 4m elevation, and 2 steel bar meters are arranged on each section; f. measuring the settlement of the support column: selecting a plurality of upright posts at the positions of the support rods at the intersection points to set a settlement observation point, wherein the total number of the settlement observation points is not less than 20%; g. road pavement: setting an observation point every 25 meters along the road adjacent to the foundation pit range; h. measurement of horizontal and vertical displacement of other underground pipelines: the joints, corner points and deformation curvature of the pipeline are larger;
s6, excavating the middle part of the foundation pit and loading and transporting the foundation pit outside: in an ultra-deep foundation pit, carrying out earthwork excavation on a first layer and a second layer of earthwork of a land block in a slope-releasing mode, carrying out construction support after the first layer and the second layer of earthwork are excavated from a gusset area to a lower layer elevation, then carrying out earthwork excavation and support construction on a supporting area in sequence, carrying out soil sampling on the middle part of the foundation pit in a concentrated mode by using a hydraulic grab trestle, comprehensively considering post-pouring belt division of a bottom plate in the third layer of earthwork excavation, excavating from a position far away from an earth outlet end to an outlet direction, and carrying out centralized loading and outward transportation by using a long-arm excavator;
s7, backfilling earthwork: timely backfilling and compacting plain soil between the outer wall and the surrounding supporting system after the basement roof is constructed; backfilling earthwork or stacking sand bags at the bottom of the foundation pit, grouting at the bottom of the pit, and externally adding a misplaced pipe into the pit and grouting for reinforcement.
The foregoing is only the embodiments of the present invention, and therefore, the patent scope of the invention is not limited thereto, and all equivalent structures made by the description of the invention and the accompanying drawings are directly or indirectly applied to other related technical fields, which are all within the scope of the invention.
Claims (6)
1. The crawler-type earth transfer and excavation method for the ultra-deep foundation pit is characterized by comprising the following steps of:
s1, deepening a drawing: analyzing the supporting area, geological conditions and foundation pit ramp arrangement conditions in the deep foundation pit according to the drawing of the deep foundation pit, and obtaining data of the inner angle support, the opposite support and the first support elevation and the second support elevation of the foundation pit; determining and optimizing the positions and the number of the arrangement of the soil conveying and excavating devices, and determining the positions of corresponding foundation pit slopes; determining the excavation sequence and the flow direction in the foundation pit;
s2, surface soil cleaning: cleaning vegetation, garbage and barriers of an excavated area;
s3, first-pass support construction and temporary lateral support reservation: digging the ground by adopting a digging machine to form a primary digging pit, carrying out first-pass vertical support beam construction in the primary digging pit, and arranging a plurality of temporary lateral supports on the vertical support beam;
s4, the soil conveying and excavating device vertically conveys and excavates the support and the angle support: the crawler-type soil conveying and excavating device comprises a soil excavating mechanism and a conveying mechanism, wherein the soil excavating mechanism comprises a mast and a conveying and excavating rod, the mast and the conveying and excavating rod are vertically arranged, the mast and the tower crane can be connected in a vertical moving mode, the conveying and excavating rod and the mast can be connected in a vertical moving mode, a crawler is arranged on the conveying and excavating rod, one side of the crawler is provided with a soil conveying cylinder, the bottom of the soil conveying cylinder is provided with a straight-type excavating bucket, the side part of the soil conveying cylinder is provided with a plurality of closable soil outlets, and the upper part of each soil outlet is provided with a movable dust cover; the conveying mechanism comprises a base, and a soil conveying belt is arranged on the base;
when the construction of the support and the angle brace is carried out, the whole soil digging mechanism is conveyed into the primary pit through a tower crane, the transfer digging rod is moved, the crawler belt is rotated, soil on the inner side of the vertical support beam is vertically dug through the straight digging bucket and is brought into the soil conveying cylinder, the whole soil digging mechanism is moved through the tower crane, the soil conveying cylinder is driven to the position above the soil conveying belt outside the foundation pit, the soil outlet is opened, the soil in the soil conveying cylinder obliquely falls onto the soil conveying belt, and the soil is conveyed into a slag car on one side of the soil conveying belt through the soil conveying belt; along with the increase of depth, the crawler-type soil conveying and excavating device is insufficient in transverse rigidity, and the soil conveying cylinder is supported through the first layer and the subsequent temporary lateral supports to ensure the stability of the transverse rigidity of the excavating mechanism;
s5, monitoring a foundation pit;
s6, excavating the middle part of the foundation pit and loading and transporting the foundation pit outside: in an ultra-deep foundation pit, carrying out earthwork excavation on a first layer and a second layer of earthwork of a land block in a slope-releasing mode, carrying out construction support after the first layer and the second layer of earthwork are excavated from a gusset area to a lower layer elevation, then carrying out earthwork excavation and support construction on a supporting area in sequence, carrying out soil sampling on the middle part of the foundation pit in a concentrated mode by using a hydraulic grab trestle, comprehensively considering post-pouring belt division of a bottom plate in the third layer of earthwork excavation, excavating from a position far away from an earth outlet end to an outlet direction, and carrying out centralized loading and outward transportation by using a long-arm excavator;
s7, backfilling earthwork: timely backfilling and compacting plain soil between the outer wall and the surrounding supporting system after the basement roof is constructed; backfilling earthwork or stacking sand bags at the bottom of the foundation pit, grouting at the bottom of the pit, and externally adding a misplaced pipe into the pit and grouting for reinforcement.
2. The crawler-type earth-moving method for ultra-deep foundation pit according to claim 1, wherein in S3, when the earth is excavated by using the excavator, the excavation depth is controlled to a depth less than a design depth by half a meter, the remaining depth is manually excavated, and the final depth is controlled to a depth less than the design depth by 0.2 meter, thereby forming an initial pit, and the diameter of the initial pit is controlled to 2 meters.
3. The crawler-type earth-moving method for ultra-deep foundation pit according to claim 1 or 2, wherein in S4, the mast and the tower crane are movably connected up and down through a pulley frame.
4. The crawler-type earth-moving method for ultra-deep foundation pit according to claim 1 or 2, wherein in S4, the earth-moving rod and the mast are movably connected up and down through a guide rail.
5. A crawler-type earth-moving method for ultra-deep foundation pit according to claim 1 or 2, wherein in S4, the earth-moving belt is rotatably provided.
6. The crawler-type earth-moving method for ultra-deep foundation pit according to claim 1 or 2, wherein in S5, the specific method for foundation pit monitoring is as follows: a. measuring the horizontal displacement and sedimentation of the top of the supporting structure: 1 observation point is distributed every 20-25m along the top surface of the ring beam; b. deep horizontal displacement: when the inclinometer pipe is buried in the soil, the depth of the inclinometer pipe is not less than the depth of the underground continuous wall; when buried in the underground continuous wall, the depth is the same as that of the underground continuous wall; c. and (3) observing the underground water level: the observation well dynamically observes the underground water level outside the pit, the alarm value is 0.5m/d of change rate, and the accumulated change value is 2m; d. measuring the supporting shaft force: 9-29 supports are selected for each layer of reinforced concrete supports of the first layer, the second layer and the third layer of the land, and a reinforced concrete support axial force measurement is carried out by adopting a reinforced concrete dynamometer; e. monitoring the internal force of the underground wall: the method comprises the steps that a ground continuous wall is selected in the middle of the periphery of a foundation pit for internal force monitoring, steel bar stress meters are adopted for measurement, a group of measuring points are respectively arranged at each wall at intervals of 4m elevation, and 2 steel bar meters are arranged on each section; f. measuring the settlement of the support column: selecting a plurality of upright posts at the positions of the support rods at the intersection points to set a settlement observation point, wherein the total number of the settlement observation points is not less than 20%; g. road pavement: setting an observation point every 25 meters along the road adjacent to the foundation pit range; h. measurement of horizontal and vertical displacement of other underground pipelines: at the nodes, corner points and locations of greater deformation curvature of the pipeline.
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| CN202211189619.2A CN115419074B (en) | 2022-09-28 | 2022-09-28 | Crawler-type soil conveying and excavating method for ultra-deep foundation pit |
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| US5944452A (en) * | 1998-03-30 | 1999-08-31 | Reinert, Sr.; Gary L. | Heavy duty foundation installation apparatus and method |
| CN107012871A (en) * | 2017-04-18 | 2017-08-04 | 武汉志和岩土工程有限公司 | A kind of suspension type goes along with sb. to guard him the deep reversed construction method for greatly enhancing foundation ditch fabricated construction |
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| CN111456019A (en) * | 2020-04-10 | 2020-07-28 | 北京场道市政工程集团有限公司 | Safe construction method for foundation pit excavation |
| CN112761072A (en) * | 2019-11-01 | 2021-05-07 | 陕西建工第六建设集团有限公司 | Construction method of deep foundation pit steel trestle ramp |
| CN113174958A (en) * | 2021-03-24 | 2021-07-27 | 上海宝冶集团有限公司 | Construction method for foundation pit of adjacent road under poor ground condition |
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2022
- 2022-09-28 CN CN202211189619.2A patent/CN115419074B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5944452A (en) * | 1998-03-30 | 1999-08-31 | Reinert, Sr.; Gary L. | Heavy duty foundation installation apparatus and method |
| CN107012871A (en) * | 2017-04-18 | 2017-08-04 | 武汉志和岩土工程有限公司 | A kind of suspension type goes along with sb. to guard him the deep reversed construction method for greatly enhancing foundation ditch fabricated construction |
| CN110080237A (en) * | 2019-05-16 | 2019-08-02 | 深圳市工勘岩土集团有限公司 | It cheats the shallow earthing subway tunnel pit earthwork in bottom and excavates anti-floating construction method and structure |
| CN112761072A (en) * | 2019-11-01 | 2021-05-07 | 陕西建工第六建设集团有限公司 | Construction method of deep foundation pit steel trestle ramp |
| CN111456019A (en) * | 2020-04-10 | 2020-07-28 | 北京场道市政工程集团有限公司 | Safe construction method for foundation pit excavation |
| CN113174958A (en) * | 2021-03-24 | 2021-07-27 | 上海宝冶集团有限公司 | Construction method for foundation pit of adjacent road under poor ground condition |
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| CN115419074A (en) | 2022-12-02 |
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