CN115110535A - Comprehensive construction method for foundation pit construction - Google Patents
Comprehensive construction method for foundation pit construction Download PDFInfo
- Publication number
- CN115110535A CN115110535A CN202210856945.8A CN202210856945A CN115110535A CN 115110535 A CN115110535 A CN 115110535A CN 202210856945 A CN202210856945 A CN 202210856945A CN 115110535 A CN115110535 A CN 115110535A
- Authority
- CN
- China
- Prior art keywords
- construction
- pile
- steel
- support
- foundation pit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010276 construction Methods 0.000 title claims abstract description 115
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 70
- 239000010959 steel Substances 0.000 claims abstract description 70
- 238000009412 basement excavation Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 239000002689 soil Substances 0.000 claims abstract description 12
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 239000003337 fertilizer Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004567 concrete Substances 0.000 claims description 26
- 239000010410 layer Substances 0.000 claims description 24
- 238000005507 spraying Methods 0.000 claims description 24
- 238000013461 design Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 12
- 238000005553 drilling Methods 0.000 claims description 10
- 238000007689 inspection Methods 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 239000002344 surface layer Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000011378 shotcrete Substances 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 239000003831 antifriction material Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 description 6
- 230000005856 abnormality Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
Abstract
The invention relates to the technical field of foundation pit construction, in particular to a comprehensive construction method for foundation pit construction. The method comprises the following steps: s1, leveling the field; s2, positioning and paying off; s3, pipe pile construction and dewatering well construction; s4, constructing the piles and the waterproof curtain by the SMW method; s5, constructing the crown beam; s6, carrying out large-scale excavation on the earthwork with the depth of more than minus 5 m from north to south in a layering manner; s7, carrying out horizontal support construction on the steel pipe; s8, excavating earth with the depth of minus 5 meters below to minus 11 meters from south to north and from four corners to the center in layers; s9, cleaning and inspecting the groove; s10, constructing a foundation and a negative two-layer main body; s11, changing supports; s12, carrying out main body construction on a negative layer; and S13, backfilling the fertilizer tank. The construction method has the characteristics of no slurry pollution, small vibration noise, good water stopping performance, short construction period, less outward transportation of waste soil, low construction cost and the like. The invention is mainly applied to the foundation pit construction.
Description
Technical Field
The invention relates to the technical field of foundation pit construction, in particular to a comprehensive construction method for foundation pit construction.
Background
The SMW construction method is characterized in that a special multi-shaft stirrer is used for drilling and cutting a soil body on site, cement slurry is injected into the soil body at the end part of a drill bit, the soil body is fully stirred and mixed, H-shaped steel or other sectional materials are inserted into a stirring pile body to form an underground continuous wall body, the wall body is directly used as a soil retaining and water stopping structure, and in foundation pit excavation, a support mode of structures such as a diagonal brace, a corner brace or a transverse brace is usually adopted. The traditional construction method pile can not form a continuous, complete and seamless underground continuous wall body with certain strength and rigidity, and has the advantages of long construction period, high construction cost, great environmental pollution and unsuitability for deep foundation pit engineering in cities.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a comprehensive construction method for foundation pit construction. The construction method has the characteristics of small disturbance, no slurry pollution, small vibration noise, good water stopping performance, short construction period, less outward transportation of waste soil, low construction cost and the like during construction.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a comprehensive construction method for foundation pit construction comprises the following steps:
s1, leveling the field: before construction of the pile in the SMW construction method, necessary site leveling is required in advance, a temporary construction access road is constructed, ground and underground obstacles in a construction area range are removed, and the site ground and the construction access road load are based on a pile machine capable of walking;
s2, positioning and paying off: according to the coordinate reference points provided by the construction unit, lofting positioning and engineering guidance and measurement work are carried out according to a design drawing, permanent point and temporary point marks are made, a measurement technology rechecking list is made after lofting and line setting, and the next process is carried out after rechecking is qualified by a supervision unit;
s3, pipe pile construction and dewatering well construction;
s4, constructing the piles and the waterproof curtain by the SMW method;
s5, crown beam construction: positioning and paying-off → excavating, cleaning a crown beam foundation groove → binding steel bars → erecting a template → pouring concrete;
s6, carrying out large-scale excavation on the earthwork with the depth of more than minus 5 m from north to south in a layering manner;
s7, steel pipe horizontal support construction: support pile construction → earth excavation → positioning measurement → steel support installation → prestress application → negative two-layer structure construction → fertilizer tank backfill support replacement → support dismantling;
s8, excavating earth with the depth of minus 5 meters below to minus 11 meters from south to north and from four corners to the center in layers;
s9, cleaning and inspecting the groove;
s10, constructing a foundation and a negative two-layer main body: excavating earth → trimming side slope → measuring, paying off → embedding and spraying concrete thickness control pile → preparing concrete material → sequentially opening electric switch, wind switch, water switch and spraying first layer of concrete → performing second layer of concrete spraying operation → maintaining concrete surface layer;
s11, support replacement: positioning and paying-off → digging a groove → driving a steel plate pile → pulling-out → processing a pile hole;
s12, carrying out main body construction on a negative layer: the drilling machine is in position → the angle of the drilling machine is adjusted → the drilling is carried out → the pipe is inserted → the high-pressure injection grouting operation → the injection is finished → the pipe is pulled → the machine is cleaned;
and S13, backfilling the fertilizer tank.
In the step S4, the construction step is measurement lofting; digging a groove; arranging guide positioning section steel; the SMW mixer is in place, and the horizontal and vertical degrees of the composite pile machine are corrected; mixing cement slurry, starting an air compressor, and delivering the slurry to a drill bit of the pile machine; the drill bit sprays slurry and gas and lifts to the designed pile top elevation; vertically hoisting and positioning the H-shaped steel; checking the verticality of the H-shaped steel; inserting section steel, fixing the section steel, performing the next construction cycle, and repeatedly correcting the horizontal and vertical operations of the composite pile machine; finishing construction; and (5) recovering the section steel.
And (4) carrying out quality inspection before vertically hoisting and positioning the H-shaped steel, and coating the H-shaped steel with an anti-friction material.
And after the construction is finished, after the foundation pit excavation and the structure construction are finished and the design strength is reached, carrying out residual soil treatment and withdrawing by using a stirring machine.
In the step S7, after the construction of all the waist beams at the elevation of-4 m is completed, a 50T crawler crane is adopted to place four corner supports according to the excavation working condition, after the waist beams reach the design strength grade, the prestress is applied to the four corner supports, and after the excavation of the earth on the north side of the post-cast strip is completed, the construction of a middle horizontal support is started; the horizontal steel supports are installed according to the marked elevation positions of the waist beam and the support pile, and are assembled according to the designed length and the member modulus of the steel pipe support; if redundant neutral positions exist, a relatively thick steel plate is used for closely attaching the pad, so that the support system is prevented from being stressed to be eccentric in the subsequent stress application process, and then the tie rod is installed.
In the step S10, concrete thickness marks are embedded, the mixing proportion is prepared by a sampling test on site according to a mixing proportion notice issued by a laboratory, the strength of the cement labeled P.042.5-grade ordinary portland cement reaches C20, and the surface is required to be basically flat; the concrete spraying operation should be carried out in layers and sections, the spraying sequence in the same section should be from bottom to top, the once spraying thickness is preferably 50mm, the spray head is preferably vertical to the sprayed surface, and the distance is preferably 0.6-1.0 m; and (4) after the sprayed concrete is finally set for 2 hours, watering and maintaining, wherein the maintaining time is determined according to the current air temperature. The spraying sequence of the working surface is from bottom to top, the spraying is started from the bottom of the excavation layer to top, and the thickness of the final finished surface layer meets 80 mm.
In step S12, the drill rod head is aligned with the center of the hole site according to the on-site line laying, and the drill must be horizontally corrected after being in place, so that the axis of the drill rod is vertically aligned with the center of the hole site, and the verticality deviation of the hole site is not more than 1%. In the alignment correction inspection, the inspection is carried out from two vertical directions by using a plumb bob, and the height is not less than 2 meters.
Compared with the prior art, the invention has the beneficial effects that:
the application in the foundation pit enclosure construction can obtain good economic and social benefits, the pile body rigidity is similar to that of a cast-in-place pile, the waste soil is less, the pollution to the surrounding environment is small, and the SMW construction method pile has the characteristics of small disturbance during construction, no mud pollution, small vibration noise, good water stopping performance, short construction period, less waste soil outward transportation, low construction cost and the like.
Drawings
FIG. 1 is a schematic view of the construction process of the present invention;
fig. 2 is a process flow of the SMW process pile of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
A comprehensive construction method for foundation pit construction comprises the following steps:
s1, leveling the field: before construction of the pile in the SMW construction method, necessary site leveling is required in advance, a temporary construction access road is constructed, ground and underground obstacles in a construction area range are removed, and the site ground and the construction access road load are based on a pile machine capable of walking;
s2, positioning and paying-off: according to the coordinate reference points provided by the construction unit, lofting positioning and engineering guidance and measurement work are carried out according to a design drawing, permanent point and temporary point marks are made, a measurement technology rechecking list is made after lofting and line setting, and the next process is carried out after rechecking is qualified by a supervision unit;
s3, pipe pile construction and dewatering well construction;
s4, constructing the piles and the waterproof curtain by the SMW method;
s5, constructing the crown beam: positioning and paying-off → excavating, cleaning a crown beam foundation groove → binding steel bars → erecting a template → pouring concrete;
s6, carrying out large-scale excavation on the earthwork with the depth of more than minus 5 m from north to south in a layering manner;
s7, steel pipe horizontal support construction: support pile construction → earth excavation → positioning measurement → steel support installation → prestress application → negative two-layer structure construction → fertilizer tank backfill support replacement → support dismantling;
s8, excavating earth with the depth of minus 5 meters below to minus 11 meters from south to north and from four corners to the center in layers;
s9, cleaning and inspecting the groove;
s10, constructing a foundation and a negative two-layer main body: excavating earthwork → trimming side slope → measuring, setting out line → embedding and spraying concrete thickness control pile → preparing concrete material → sequentially opening electric, wind and water switches and spraying first layer of concrete → carrying out second layer of concrete spraying operation → curing of concrete surface layer;
s11, support replacement: positioning and paying-off → digging a groove → driving a steel plate pile → pulling-out → processing a pile hole;
s12, carrying out main body construction on a negative layer: the drilling machine is in place → the angle of the drilling machine is adjusted → the drilling hole → the pipe insertion → the high-pressure injection grouting operation → the injection is finished → the pipe is pulled out → the machine is cleaned;
and S13, backfilling the fertilizer tank.
Preferably, in step S4, the construction step is measurement lofting; digging a groove; arranging guide positioning section steel; the SMW mixer is in place, and the horizontal and vertical degrees of the composite pile machine are corrected; mixing cement slurry, starting an air compressor, and delivering the slurry to a drill bit of the pile machine; the drill bit sprays slurry and gas and lifts to the designed pile top elevation; vertically hoisting and positioning the H-shaped steel; checking the verticality of the H-shaped steel; inserting section steel, fixing the section steel, performing the next construction cycle, and repeatedly correcting the horizontal and vertical operations of the composite pile machine; finishing construction; and (5) recovering the section steel.
Preferably, the quality inspection is carried out before the H-shaped steel is vertically lifted and positioned, and the H-shaped steel is coated with the friction reducing material.
Preferably, after the construction is finished, after the foundation pit excavation and the structure construction are finished and the design strength is reached, the residual soil is treated, and the stirring machine is withdrawn.
Preferably, in step S7, after the construction of all the waist beams at the elevation of-4 m is completed, a 50T crawler crane is adopted to place four corner supports according to the excavation working condition, after the waist beams reach the design strength grade, the prestress is applied to the four corner supports, and after the excavation of the earthwork on the north side of the post-cast strip is completed, the construction of the middle horizontal support is started; the horizontal steel supports are installed according to the marked elevation positions of the waist beam and the support pile, and are assembled according to the designed length and the member modulus of the steel pipe support; if redundant neutral positions exist, a relatively thick steel plate is used for closely attaching the pad, so that the support system is prevented from being stressed to be eccentric in the subsequent stress application process, and then the tie rod is installed.
Support the construction main points:
1) and (3) carrying out layered excavation during excavation, along with excavation and steel support erection, rapidly installing the steel support after the steel support is excavated at the support position, and applying prestress according to a design value in time.
2) Marking a supporting position on the fender post in advance, and processing the wall surface at the supporting position in advance so as to ensure that the supporting top end and the wall surface are uniformly stressed.
3) The steel support is assembled outside the foundation pit in sections in advance, and when the steel pipe is lengthened, a connecting flange and a steel rib plate are welded at the joint of the steel pipe and are screwed up by bolts.
4) Before supporting and stressing, a supporting shaft force monitoring point is quickly set, the stressing is carried out after the initial reading is obtained, and the actual pre-stressing force is tested after the stressing, so that the pre-stressing force is controlled to be accurately applied. When the steel support is stressed, the loading speed is determined according to the design grading loading and the field observation wall body loading reaction, and the stress is pre-applied according to the design requirement.
5) After the steel support is prestressed, monitoring work is well done when earth excavation and structural construction are carried out, and remedial measures are timely taken when abnormality is found according to monitoring results. Meanwhile, the safety of the steel support is well monitored, and the occurrence of the support safety hazard is firmly avoided.
6) Within 12h before and after the support prestress is added, monitoring frequency is encrypted, and prestress is added to a design value when the prestress loss or the deformation rate of the enclosure structure is not obviously converged.
7) Before the end inclined support is erected, a triangular steel plate support seat with the end face perpendicular to the axis of the inclined support must be welded, and the strength is guaranteed to be reliable.
8) When the steel support is installed, the axes of the end head, the support and the jack are on the same plane. In order to ensure the straightness, the bolts of the flange on the support should be tightened in a diagonal or graduated sequence. 9) When each support is installed, 2 jacks of 100t are used for applying prestress, calibration is carried out by a detection unit with relevant qualification before use, the jacks apply jacking force, and the jacks can be dismantled only by plugging the steel wedges after the design value is reached.
10) The support is erected in time, a specially-assigned person is required to be responsible for overhauling field equipment in the erecting process, and the specially-assigned person is required to conduct unified command in the hoisting process so as to guarantee construction safety.
11) The steel support replacement material needs to be counted and stored by a specially-assigned person, and the size and the type are clear for the next use.
12) The erected support strictly prohibits people from walking and stacking objects, and measures are immediately taken for reinforcing or reapplying axial force if phenomena of deflection increase or steel wedge looseness and the like are found.
13) The supports are processed and assembled according to the designed length, and flange plate bolts are used to ensure that each support is screwed down. The steel pipe connected with the flange plate is screwed up by using bolts and is lengthened to the designed length.
14) The steel support is guaranteed not to be twisted after being erected, and the fact that the axial force direction is vertical is the key. Therefore, before the steel support is erected, the elevation of the support end bracket is strictly controlled, and all fulcrums of the steel support are ensured to be on the same horizontal line.
15) After the steel support is prestressed, monitoring work is well done during earth excavation and structural construction, and the prestress is timely supplemented when abnormality is found according to a monitoring result. Meanwhile, the safety of the steel pipe support is well monitored, the load is not allowed to be stacked on the steel support, the steel support is not allowed to collide during soil excavation, and the support instability is prevented.
Preferably, in step S10, the concrete thickness mark is embedded, the mix proportion is prepared by a sampling test on site according to a mix proportion notice issued in a laboratory, the concrete strength of the cement labeled p.042.5-grade ordinary portland cement reaches C20, and the surface is required to be basically flat; the concrete spraying operation should be carried out in layers and sections, the spraying sequence in the same section should be from bottom to top, the once spraying thickness is preferably 50mm, the spray head is preferably kept vertical to the sprayed surface, and the distance is preferably 0.6-1.0 m; and (4) after the sprayed concrete is finally set for 2 hours, watering and curing, wherein the curing time is determined according to the current air temperature. The spraying sequence of the working surface is from bottom to top, the spraying is started from the bottom of the excavation layer to top, and the thickness of the final finished surface layer meets 80 mm.
Preferably, in step S12, the drill rod head is aligned with the hole site center according to the on-site line laying, and after the drill is in place, the drill must be horizontally aligned so that the axis of the drill rod is vertically aligned with the hole site center, thereby ensuring that the verticality deviation of the drill hole is not more than 1%. In the alignment correction inspection, the inspection is carried out from two vertical directions by using a plumb bob, and the height is not less than 2 meters.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (7)
1. A comprehensive construction method for foundation pit construction is characterized by comprising the following steps:
s1, leveling the field: before construction of the pile in the SMW construction method, necessary site leveling is required in advance, a temporary construction access road is constructed, ground and underground obstacles in a construction area range are removed, and the site ground and the construction access road load are based on a pile machine capable of walking;
s2, positioning and paying-off: according to the coordinate reference points provided by the construction unit, lofting positioning and engineering guidance and measurement work are carried out according to a design drawing, permanent point and temporary point marks are made, a measurement technology rechecking list is made after lofting and line setting, and the next process is carried out after rechecking is qualified by a supervision unit;
s3, pipe pile construction and dewatering well construction;
s4, constructing the piles and the waterproof curtain by the SMW method;
s5, crown beam construction: positioning and paying-off → excavating, cleaning a crown beam foundation groove → binding steel bars → erecting a template → pouring concrete;
s6, carrying out large-scale excavation on the earthwork with the depth of more than minus 5 m from north to south in a layering manner;
s7, steel pipe horizontal support construction: support pile construction → earth excavation → positioning measurement → steel support installation → prestress application → negative two-layer structure construction → fertilizer tank backfill support replacement → support dismantling;
s8, excavating earth with the depth of minus 5 meters below to minus 11 meters from south to north and from four corners to the center in layers;
s9, cleaning and testing the groove;
s10, constructing a foundation and a negative two-layer main body: excavating earth → trimming side slope → measuring, paying off → embedding and spraying concrete thickness control pile → preparing concrete material → sequentially opening electric switch, wind switch, water switch and spraying first layer of concrete → performing second layer of concrete spraying operation → maintaining concrete surface layer;
s11, support replacement: positioning and paying-off → digging a groove → driving a steel plate pile → pulling-out → processing a pile hole;
s12, carrying out main body construction on a negative layer: the drilling machine is in place → the angle of the drilling machine is adjusted → the drilling hole → the pipe insertion → the high-pressure injection grouting operation → the injection is finished → the pipe is pulled out → the machine is cleaned;
and S13, backfilling the fertilizer tank.
2. The comprehensive construction method for foundation pit construction according to claim 1, characterized in that: in the step S4, the construction step is measurement lofting; digging a groove; arranging guide positioning section steel; the SMW mixer is in place, and the horizontal and vertical degrees of the composite pile machine are corrected; mixing cement slurry, starting an air compressor, and delivering the slurry to a drill bit of the pile machine; the drill bit sprays slurry and gas and lifts to the designed pile top elevation; vertically hoisting and positioning the H-shaped steel; checking the verticality of the H-shaped steel; inserting section steel, fixing the section steel, performing the next construction cycle, and repeatedly correcting the horizontal and vertical operations of the composite pile machine; finishing construction; and (5) recovering the section steel.
3. The comprehensive construction method for foundation pit construction according to claim 2, characterized in that: and (4) carrying out quality inspection before vertically hoisting and positioning the H-shaped steel, and coating the H-shaped steel with an anti-friction material.
4. The comprehensive construction method for foundation pit construction according to claim 2, characterized in that: and after the construction is finished, after the foundation pit excavation and the structure construction are finished and the design strength is reached, carrying out residual soil treatment and withdrawing by using a stirring machine.
5. The comprehensive construction method for foundation pit construction according to claim 1, characterized in that: in the step S7, after the construction of all the waist beams at the elevation of-4 m is completed, a 50T crawler crane is adopted to place four corner supports according to the excavation working condition, after the waist beams reach the design strength grade, the prestress is applied to the four corner supports, and after the excavation of the earth on the north side of the post-cast strip is completed, the construction of a middle horizontal support is started; the horizontal steel supports are installed according to the marked elevation positions of the waist beam and the support pile, and are assembled according to the designed length and the member modulus of the steel pipe support; if redundant neutral positions exist, a relatively thick steel plate is used for closely attaching the pad, so that the support system is prevented from being stressed to be eccentric in the subsequent stress application process, and then the tie rod is installed.
6. The comprehensive construction method for foundation pit construction according to claim 1, characterized in that: in the step S10, concrete thickness marks are embedded, the mixing proportion is prepared in a sampling test on site according to a mixing proportion notice issued in a laboratory, the cement grade is P.042.5 grade ordinary portland cement, the concrete strength reaches C20, and the surface is required to be basically flat; the concrete spraying operation should be carried out in layers and sections, the spraying sequence in the same section should be from bottom to top, the once spraying thickness is preferably 50mm, the spray head is preferably kept vertical to the sprayed surface, and the distance is preferably 0.6-1.0 m; and (3) after the sprayed concrete is finally set for 2 hours, watering and maintaining, wherein the maintaining time is determined according to the current air temperature, the spraying sequence of the working surface is from bottom to top, the spraying is started from the bottom of the excavation layer to top, and the thickness of the final finished surface layer meets 80 mm.
7. The comprehensive construction method for foundation pit construction according to claim 1, characterized in that: in step S12, the drill rod head is aligned with the center of the hole site according to the on-site line laying, and the drill must be horizontally corrected after being in place, so that the axis of the drill rod is vertically aligned with the center of the hole site, and the verticality deviation of the hole site is not more than 1%. In the alignment correction inspection, the inspection is carried out from two vertical directions by using a plumb bob, and the height is not less than 2 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210856945.8A CN115110535A (en) | 2022-07-20 | 2022-07-20 | Comprehensive construction method for foundation pit construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210856945.8A CN115110535A (en) | 2022-07-20 | 2022-07-20 | Comprehensive construction method for foundation pit construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115110535A true CN115110535A (en) | 2022-09-27 |
Family
ID=83333734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210856945.8A Pending CN115110535A (en) | 2022-07-20 | 2022-07-20 | Comprehensive construction method for foundation pit construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115110535A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030005650A1 (en) * | 1999-01-13 | 2003-01-09 | Hong Won Kee | Composite retaining wall and construction method for underground structure |
| CN103255771A (en) * | 2013-05-24 | 2013-08-21 | 山西太行建设开发有限公司 | Method for excavating super-deep foundation pit engineering piles in graded mode and graded composite supporting of supporting piles |
| CN104612162A (en) * | 2014-12-15 | 2015-05-13 | 中铁二十局集团第三工程有限公司 | Subway station deep foundation pit excavation construction method |
| CN108343071A (en) * | 2018-03-19 | 2018-07-31 | 南京市测绘勘察研究院股份有限公司 | A kind of foundation pit supporting construction and construction method of steel sheet pile combined deposited pile |
| CN109610470A (en) * | 2018-11-30 | 2019-04-12 | 福建建中建设科技股份有限公司 | A kind of base pit stand construction using three axes agitating pile machine |
| CN110080242A (en) * | 2019-04-24 | 2019-08-02 | 广州市城市规划勘测设计研究院 | The construction method of basement pile wall interaction structural system |
| CN110306557A (en) * | 2019-07-10 | 2019-10-08 | 武汉立诚岩土工程有限公司 | Earthwork digging method based on basement deep-foundation pit engineering |
| CN112392049A (en) * | 2020-10-20 | 2021-02-23 | 鲁亦楠 | Excavation construction method for deep foundation pit in weak stratum |
| WO2021248822A1 (en) * | 2020-06-09 | 2021-12-16 | 江苏景源万河环境科技有限公司 | Construction method for expanded-head prestressed concrete anchor rod |
| WO2022096024A1 (en) * | 2021-02-22 | 2022-05-12 | 中铁九局集团第四工程有限公司 | Construction method for super-long small-diameter hole bored pile |
-
2022
- 2022-07-20 CN CN202210856945.8A patent/CN115110535A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030005650A1 (en) * | 1999-01-13 | 2003-01-09 | Hong Won Kee | Composite retaining wall and construction method for underground structure |
| CN103255771A (en) * | 2013-05-24 | 2013-08-21 | 山西太行建设开发有限公司 | Method for excavating super-deep foundation pit engineering piles in graded mode and graded composite supporting of supporting piles |
| CN104612162A (en) * | 2014-12-15 | 2015-05-13 | 中铁二十局集团第三工程有限公司 | Subway station deep foundation pit excavation construction method |
| CN108343071A (en) * | 2018-03-19 | 2018-07-31 | 南京市测绘勘察研究院股份有限公司 | A kind of foundation pit supporting construction and construction method of steel sheet pile combined deposited pile |
| CN109610470A (en) * | 2018-11-30 | 2019-04-12 | 福建建中建设科技股份有限公司 | A kind of base pit stand construction using three axes agitating pile machine |
| CN110080242A (en) * | 2019-04-24 | 2019-08-02 | 广州市城市规划勘测设计研究院 | The construction method of basement pile wall interaction structural system |
| CN110306557A (en) * | 2019-07-10 | 2019-10-08 | 武汉立诚岩土工程有限公司 | Earthwork digging method based on basement deep-foundation pit engineering |
| WO2021248822A1 (en) * | 2020-06-09 | 2021-12-16 | 江苏景源万河环境科技有限公司 | Construction method for expanded-head prestressed concrete anchor rod |
| CN112392049A (en) * | 2020-10-20 | 2021-02-23 | 鲁亦楠 | Excavation construction method for deep foundation pit in weak stratum |
| WO2022096024A1 (en) * | 2021-02-22 | 2022-05-12 | 中铁九局集团第四工程有限公司 | Construction method for super-long small-diameter hole bored pile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108842819B (en) | Urban rail transit cable line tunnel construction method | |
| CN111945767B (en) | Construction process of pile-first outer jacket type jacket of offshore wind power booster station | |
| CN109611102B (en) | Construction method for cold excavation underpass overpass | |
| CN109113746B (en) | Construction method of shield manhole | |
| CN112593559A (en) | Construction method for deep foundation pit supporting of micro-pile prestressed anchor cable composite soil nailing wall | |
| CN112267472A (en) | Construction process for foundation pit support of inclined pile of advanced mixing pile | |
| CN104264683B (en) | Building concave shape ultra-deep foundation pit subregion supporting method is protected for three around literary composition | |
| CN111005387A (en) | Deep foundation pit prestress support replacement support construction method | |
| CN113235601A (en) | Deep foundation pit construction risk control structure and method for collapsible loess adjacent building | |
| CN109457694A (en) | A kind of variable diameters steel reinforcement cage enlarged footing anti-floating or pressure bearing pile and construction in conjunction with mixing pile or rotary churning pile | |
| CN112609690A (en) | Construction method of rotary drilling cast-in-place pile in sea-filling geological complex area | |
| CN114809029A (en) | High cutting slope anchor rod frame beam coupling construction method | |
| CN114215090A (en) | Construction method of raft and compression pile in closed space | |
| CN107740425A (en) | Revolve cast anchor rope foundation pit supporting construction and its construction method | |
| CN114411761B (en) | Advanced pre-supporting system and method for subway tunnel to be built in new building construction | |
| CN113266019B (en) | Construction method of foundation pit steel pipe support system | |
| CN115110535A (en) | Comprehensive construction method for foundation pit construction | |
| CN113463655A (en) | Pile construction method in complex environment ultra-deep foundation pit support | |
| CN209669857U (en) | A kind of variable diameters steel reinforcement cage enlarged footing anchor pole anti-floating or pressure bearing pile | |
| CN207582473U (en) | Foundation pit supporting construction | |
| CN113293773A (en) | Foundation pit supporting system and construction method thereof | |
| CN112065433A (en) | Pipe jacking working well supporting and water stopping assembly and construction method | |
| CN116591043B (en) | Construction method of pier stud embedded bars on splicing surface of assembled bridge bearing platform | |
| CN219690535U (en) | Interpolation precast pile TRD wall combines bracing formula IMS stirring stake foundation ditch combination supporting construction | |
| CN220978027U (en) | H-shaped steel foundation pit support system with water stopping function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |