CN113818447B - Adjacent compact construction foundation pit combined supporting structure and construction method thereof - Google Patents
Adjacent compact construction foundation pit combined supporting structure and construction method thereof Download PDFInfo
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- CN113818447B CN113818447B CN202111210983.8A CN202111210983A CN113818447B CN 113818447 B CN113818447 B CN 113818447B CN 202111210983 A CN202111210983 A CN 202111210983A CN 113818447 B CN113818447 B CN 113818447B
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- steel pipe
- blade
- foundation pit
- limit steel
- blade group
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
Abstract
The invention relates to an adjacent compact construction foundation pit combined supporting structure and a construction tool thereof, wherein an isolation soil layer is arranged between a first foundation pit and a second foundation pit, a first prefabricated supporting plate is arranged on one side of the isolation soil layer, which is positioned on the first foundation pit, the lower end of the first prefabricated supporting plate is inserted into the bottom wall of the first foundation pit, a second prefabricated supporting plate is arranged on one side of the isolation soil layer, which is positioned on the second foundation pit, the lower end of the second prefabricated supporting plate is inserted into the bottom wall of the second foundation pit, the first prefabricated supporting plate and the second prefabricated supporting plate are connected together through a plurality of prestressed anchors, and the first prefabricated supporting plate and the second prefabricated supporting plate are both in steel structures. The invention provides a foundation pit combined supporting structure based on compact construction of an adjacent deep foundation pit, which can shorten construction time and has small disturbance in construction, and solves the problems of long construction time and large disturbance in construction of the existing foundation pit combined supporting structure based on compact construction of the adjacent deep foundation pit.
Description
Technical Field
The invention relates to the field of buildings, in particular to a neighboring compact construction foundation pit combined supporting structure and a construction method thereof.
Background
Foundation pit engineering is involved in all construction works from ancient times to date. The construction of a large number of underground structures such as underground parking plants, basements, underground subway stations, underground civil air defense projects and the like is gradually raised, but a problem is caused at the same time, a situation of nearly simultaneous development and utilization exists in many adjacent underground structures, and the working condition of simultaneous construction of the adjacent foundation pits (hereinafter, the foundation pits which are immediately adjacent and simultaneously constructed are called as adjacent compact construction foundation pits) must be developed and perfected at the moment, so that the construction quality and safety are guaranteed, the economy of the construction task is important, the importance of simultaneous construction of the adjacent foundation pits is self-evident for the development and utilization of central lands in various large cities in the future, and the combined support of the adjacent foundation pits is the basis for survival of the construction safety operation of the adjacent foundation pits.
The Chinese patent literature of CN210031842U discloses a combined supporting system for adjacent deep foundation pits based on row piles and connecting beams, wherein the supporting mode comprises row pile reinforcement, connecting beam reinforcement, opposite-pulling anchor ropes and the like.
The deep foundation pit combined support system realizes the combined support of the compact construction of the adjacent deep foundation pit, and the thought is novel, but: the method has the defects that the support is constructed on site, the time cost is relatively high, the required construction area is relatively large, and micro disturbance is difficult to achieve under the condition of being close to a building or a structure; meanwhile, the steel plate pavement for article transportation and personnel walking is not integrated, the disturbance coefficient of construction is increased under the condition of compact construction of adjacent foundation pits, fixing pieces are not longitudinally added, and the problems of steel plate dislocation and the like are easily caused.
Disclosure of Invention
The invention provides a compact construction foundation pit combined supporting structure which can shorten construction time and has small disturbance in construction, and solves the problems of long construction time and large disturbance in construction of the existing foundation pit combined supporting structure based on compact construction of adjacent deep foundation pits.
The technical problems are solved by the following technical scheme: the utility model provides an adjacent compact construction foundation ditch joint support structure, including first foundation ditch and second foundation ditch, be equipped with the isolation soil layer between first foundation ditch and the second foundation ditch, its characterized in that, isolation soil layer is located one side of first foundation ditch and is equipped with first prefabricated support plate, the lower extreme of first prefabricated support plate inserts in the diapire of first foundation ditch, isolation soil layer is located one side of second foundation ditch and is equipped with the second prefabricated support plate, the lower extreme of second prefabricated support plate inserts in the diapire of second foundation ditch, first prefabricated support plate and second prefabricated support plate link together through a plurality of prestressed anchors, first prefabricated support plate and second prefabricated support plate are steel construction; the foundation pit combined supporting structure of the adjacent foundation pit in compact construction further comprises pedestrian steel plates with two ends supported on the first prefabricated supporting plates and the second prefabricated supporting plates, wherein the pedestrian steel plates are fixedly connected with the first prefabricated supporting plates through a plurality of first reinforcing components, and the pedestrian steel plates are fixedly connected with the second prefabricated supporting plates through a plurality of second reinforcing components. The prefabricated member assembly structure is adopted, so that the prefabricated member assembly structure can be used in industrial markets, the effect of saving site construction time is achieved, and the disturbance to the site during construction is small. The manned platform is provided, and convenience in construction of a foundation pit can be improved.
Preferably, the first reinforcing component comprises a first reinforcing component part angle steel, a first reinforcing component part first fixing bolt and a first reinforcing component part second fixing bolt, wherein the first reinforcing component part first fixing bolt penetrates through one end of the first reinforcing component part angle steel and then is connected with the pedestrian steel plate in a threaded manner, and the first reinforcing component part second fixing bolt penetrates through the other end of the first reinforcing component part angle steel and then is connected with the first prefabricated support plate in a threaded manner; the second reinforcing component comprises a second reinforcing component part angle steel, a second reinforcing component part first fixing bolt and a second reinforcing component part second fixing bolt, wherein the second reinforcing component part first fixing bolt penetrates through one end of the second reinforcing component part angle steel and then is connected with a pedestrian steel plate in a threaded mode, and the second reinforcing component part second fixing bolt penetrates through the other end of the second reinforcing component part angle steel and then is connected with a second prefabricated support plate in a threaded mode. The connection is reliable, convenient and firm, and the pedestrian steel plate is convenient to detach for reuse.
Preferably, a first clamping strip is arranged on the lower surface of the pedestrian steel plate, the upper end surface of the first prefabricated support plate is provided with a first clamping groove, and the first clamping strip is arranged in the first clamping groove in a penetrating manner; the lower surface of pedestrian's steel sheet is equipped with the second card strip, establishes on the up end of the prefabricated backplate of second at the second draw-in groove, and the second card strip wears to establish in the second draw-in groove. The pedestrian steel plate can play a role in reinforcing the connection reliability between the first prefabricated support plate and the second prefabricated support plate.
Preferably, the first prefabricated support plate and the first prefabricated support plate comprise a plurality of sub-plates which are distributed along the horizontal direction and spliced together at one time, and the adjacent sub-plates are connected together through a plurality of fastening structures distributed along the vertical direction.
Preferably, the fastening structure comprises a base provided with a threaded through hole, a supporting threaded rod in the threaded through hole in a threaded manner, and two connecting rods with one ends hinged with the base, wherein the two connecting rods are distributed on two sides of the foundation pile along the radial direction of the threaded supporting rod, the other ends of the connecting rods are hinged with the connecting plate, and fastening bolts penetrate through the connecting plate; one connecting seat is fixed with one of the two adjacent sub-plates through the fastening bolt, the other connecting seat is fixed with the other of the two adjacent sub-plates through the fastening bolt, and the supporting threaded rod is supported on the sub-plates. When the connector is used, the adjacent sub-plates are close by rotating the supporting threaded rod, so that the connector is more compact.
Preferably, the connecting seat is provided with a connector, and the connecting rod is hinged on the connector and is connected with the connecting seat. The fixing is convenient.
Preferably, the support threaded rod is provided with a plurality of handles distributed along the circumference of the support threaded rod. The force is convenient when the screw rod is supported.
Preferably, the first prefabricated support plate and the first prefabricated support plate both comprise a plurality of sub-plates which are distributed along the horizontal direction and spliced together; two adjacent sub-boards, wherein the end face of one sub-board is provided with a vertical clamping groove, and the end face of the other sub-board is provided with a vertical clamping strip penetrating through the vertical clamping groove. The connection reliability is good.
Preferably, the first prefabricated support plate and the first prefabricated support plate comprise a plurality of sub-plates which are distributed along the horizontal direction and spliced together, and the joints between the sub-plates are sealed by waterproof sealing strips. Can provide waterproof effect.
Preferably, a plurality of stirring piles distributed along the distribution direction perpendicular to the first foundation pit and the second foundation pit are arranged in the isolation soil layer, and the pedestrian steel plates are supported on the stirring piles. The structure strength of the invention can be improved and the foundation pit can be excavated and the prefabricated support guard plate is prevented from sinking when being moved.
The construction method of the adjacent compact construction foundation pit combined supporting structure is characterized by further comprising a limit steel pipe sleeved on the drill rod, wherein the inner diameter of the limit steel pipe is equal to the diameter of the stirring pile, the blade group comprises an upper blade group, a middle blade group and a lower blade group, the upper blade group comprises a plurality of upper blades distributed along the circumferential direction of the drill rod, the upper blades extend along the horizontal direction, one end of the upper blades are connected with the drill rod, the other end of the upper blades are connected with the limit steel pipe, the lower blade group comprises a plurality of lower blades distributed along the circumferential direction of the drill rod, the lower blades extend along the horizontal direction, one end of the lower blades are connected with the drill rod, the other end of the lower blades are connected with the limit steel pipe, the lower end face of the limit steel pipe, the lower side face of the lower blades and the lower side face of the upper blades are provided with cutting teeth, the upper blades are arranged along the circumferential direction of the limit steel pipe, the distance between the limit steel pipe and the limit steel pipe is equal to the distance between the upper blade and the limit steel pipe, and the distance between the limit steel pipe and the limit steel pipe is equal to the limit steel pipe lifting distance when the upper blade and the slurry is driven along the distance between the limit steel pipe and the limit steel pipe is equal to the lifting distance between the limit steel pipe and the limit hole when the upper blade is driven along the distance of the upper blade and the limit steel pipe is the lifting distance of the limit steel pipe in the same along the circumferential direction, the width of the helical blade is below 5 cm. When the technical scheme is used, the rotation direction of the limiting steel pipe drilling is rotated to the set depth through the limiting steel pipe drilling, then the drill rod is reversed, the upper blade set plays a role in stirring soil at the moment, and the lower blade set plays a role in stirring mud and cement slurry. According to the technical scheme, the floating force can be generated in the stirring process, the load of the drill rod and the limiting steel pipe on the pull-down of the connecting part of the driving mechanism is reduced, and the connecting part is not easy to damage. The setting of the position relation of spacing pipe and cooperation spouting mouth can make the grout limit in spacing steel pipe, and the intensity of the stirring stake that the control pivot that can be more reliable goes out is mixed to different peripheral mud, and current open slip casting, the proportion of cement and mud can not accurate control, leads to the intensity of the stirring stake of making can not reach expectedly. In the grouting process, the mud curtain generated by the rotation of the helical blade can further play a role in separating the inner space and the outer space of the limiting steel pipe, so that the proportion of cement to mud can be controlled more reliably. According to the technical scheme, labor is saved when soil is withdrawn, the rotation of the spiral blade can enable the mobility of the soil around the limiting steel pipe to be better, and the labor is saved when the spiral blade moves upwards. The disturbance to the surrounding soil mass can be reduced.
Preferably, the blade group still includes well blade group, well blade group is located between blade group and the lower blade group, well blade group is including the cover establish the sliding sleeve on the drilling rod and set up a plurality of well blades of distributing along sliding sleeve circumference on the sliding sleeve outer peripheral face, the upper and lower both ends of sliding sleeve are equipped with a plurality of arc shell fragments that bulge towards keeping away from the drilling rod direction respectively, the circumference that the arc shell fragment was followed the drilling rod distributes, the one end that the sliding sleeve was kept away from to the arc shell fragment links together with the go-between, breaks off between well blade and the spacing steel pipe, the plane at well blade place is the horizontal plane. The middle blade group is a blade capable of freely rotating and lifting, does not rotate along with the rotation of the drill rod, but passively rotates along with the stirring of soil, so that the radial turbulence effect can be achieved, the axial stirring effect can be achieved, mud balls and slurry overflow can be prevented from being produced by mixed slurry, the stirring effect is improved, the soil reinforcing capacity is enhanced, and the generatrix of the sliding sleeve is in an arc shape of a arch bridge in a direction far away from the drill rod. The arc-shaped elastic sheets at the two ends of the sliding sleeve can play a role in arc-shaped lamination at the two ends, the sliding sleeve is obviously fed back by the axial force of the soil body, and in the stirring process, the equal flow speed of the soil body in the radial direction of the steel sleeve cannot be ensured, so that the feedback force of the soil body on the middle blade set is possibly uneven, and the axial force of the middle blade set can generate torsion action on the middle blade by the mud ball and slurry overflow existing in the soil body; the middle blade group can be reset under the elastic action of the elastic wave strip when sliding up and down to the limit, so that the stirring device has a reliable axial stirring effect and can greatly improve the stirring efficiency.
Preferably, vertical strips are arranged on two sides of the width direction of the middle blade, the vertical strips are disconnected with the sliding sleeve, and the inner diameter of the smallest part of the sliding sleeve is more than 2 mm larger than the diameter of the drill rod. The capability of the middle blade to resist the slurry-rising force can be improved.
The invention has the following advantages: the prefabricated member grooves are formed, and the prefabricated member grooves are directly spliced and formed when in use, so that the installation efficiency is high; adjacent sub-plates are connected through a fastening structure, and the two prefabricated support plates are fastened again by adopting a pre-stressed anchor cable, so that the reinforcement effect is good; the pedestrian steel plate is arranged, so that construction transportation and personnel walking can be realized, safety armrests are arranged on two sides of the pedestrian steel plate, the lower part of the pedestrian steel plate is embedded into the prefabricated support plate, and the pedestrian steel plate is connected with the support main body through the reinforcing component and is an integral steel plate. The prefabricated steel plates are prefabricated and formed in factories, and are directly spliced and formed in use, so that the installation efficiency is high, and the supporting effect is good. The pedestrian steel sheet and the prefabricated support plate are fixedly fastened by utilizing the angle steel and the nuts, so that dislocation displacement is prevented from occurring, and the reinforcing effect is good.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic view of a fastening structure;
FIG. 4 is an enlarged partial schematic view at B of FIG. 1;
FIG. 5 is a schematic diagram of a second embodiment of the present invention;
FIG. 6 is a partial schematic view of a tool for constructing a mixing pile according to the second embodiment;
FIG. 7 is a schematic illustration of another connection of a middle blade set to a drill pipe.
In the figure: the first foundation pit 1, the second foundation pit 2, the isolated soil layer 3, the first prefabricated support plate 4, the bottom wall 5 of the first foundation pit, the second prefabricated support plate 6, the bottom wall 7 of the second foundation pit, the prestressed anchor 8, the pedestrian steel plate 9, the guardrail 10, the first reinforcing component 11, the second reinforcing component 12, the first reinforcing component part angle 13, the first fixing bolt 14 of the first reinforcing component part, the second fixing bolt 15 of the first reinforcing component part, the second reinforcing component part angle 16, the first fixing bolt 17 of the second reinforcing component part, the second fixing bolt 18 of the second reinforcing component part, the first clamping strip 19, the second clamping strip 20, the separating plate 21, the fastening structure 22, the base 23, the supporting threaded rod 24, the connecting rod 25, the fastening bolt 26, the connecting head 27, the handle 28, the vertical clamping strip 29, the connecting plate 30, the stirring pile 31, the drill rod 32, the gunite 33, the limiting steel pipe 34, the upper blade 35, the lower blade 36, the cutting tooth 37, the helical blade 38, the sliding sleeve 39, the middle blade 40, the arc-shaped elastic piece 41, the connecting ring 42 and the vertical strip 43.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 4, a foundation pit joint supporting structure based on compact construction of adjacent deep foundation pits comprises a first foundation pit 1 and a second foundation pit 2, an isolation soil layer 3 is arranged between the first foundation pit and the second foundation pit, a first prefabricated supporting plate 4 is arranged on one side of the isolation soil layer, which is located on the first foundation pit, the lower end of the first prefabricated supporting plate is inserted into a bottom wall 5 of the first foundation pit, a second prefabricated supporting plate 6 is arranged on one side of the isolation soil layer, which is located on the second foundation pit, the lower end of the second prefabricated supporting plate is inserted into a bottom wall 7 of the second foundation pit, the first prefabricated supporting plate and the second prefabricated supporting plate are connected together through a plurality of prestressed anchors 8, and the first prefabricated supporting plate and the second prefabricated supporting plate are all of steel structures. The invention also comprises a pedestrian steel plate 9 supported at both ends on the first prefabricated support panel and the second prefabricated support panel. Guard rails 10 are provided on both sides of the pedestrian steel plate. The pedestrian steel plates and the first prefabricated support plates are fixedly connected together through a plurality of first reinforcing components 11. The pedestrian steel plates and the second prefabricated support plates are fixedly connected together through a plurality of second reinforcing components 12. The first reinforcement assembly comprises a first reinforcement assembly part angle steel 13, a first reinforcement assembly part first fixing bolt 14 and a first reinforcement assembly part second fixing bolt 15, wherein the first reinforcement assembly part first fixing bolt penetrates through one end of the first reinforcement assembly part angle steel and is connected with a pedestrian steel plate in a threaded manner, and the first reinforcement assembly part second fixing bolt penetrates through the other end of the first reinforcement assembly part angle steel and is connected with a first prefabricated support plate in a threaded manner; the second reinforcing component comprises a second reinforcing component part angle steel 16, a second reinforcing component part first fixing bolt 17 and a second reinforcing component part second fixing bolt 18, wherein the second reinforcing component part first fixing bolt penetrates through one end of the second reinforcing component part angle steel and is connected with a pedestrian steel plate in a threaded mode, and the second reinforcing component part second fixing bolt penetrates through the other end of the second reinforcing component part angle steel and is connected with a second prefabricated support plate in a threaded mode. The lower surface of the pedestrian steel plate is provided with a first clamping strip 19, the upper end surface of the first prefabricated support plate is provided with a first clamping groove, and the first clamping strip is arranged in the first clamping groove in a penetrating manner; the lower surface of pedestrian's steel sheet is equipped with second card strip 20, establishes on the up end of second prefabricated backplate at the second draw-in groove, and the second card strip wears to establish in the second draw-in groove. The first prefabricated support plate and the first prefabricated support plate comprise a plurality of sub-plates 21 which are spliced together at one time along the horizontal direction, and the adjacent sub-plates are connected together through a plurality of fastening structures 22 which are distributed along the vertical direction. The fastening structure comprises a base 23 provided with a threaded through hole, a supporting threaded rod 24 in the threaded through hole in a threaded manner, and two connecting rods 25 with one ends hinged with the base, wherein the two connecting rods are distributed on two sides of a foundation pile along the radial direction of the threaded supporting rod, the other ends of the connecting rods are hinged with a connecting plate 30, and fastening bolts 26 are arranged on the connecting plate in a penetrating manner; one connecting seat is fixed with one of the two adjacent sub-plates through the fastening bolt, the other connecting seat is fixed with the other of the two adjacent sub-plates through the fastening bolt, and the supporting threaded rod is supported on the sub-plates. The connecting seat is provided with a connector 27, and the connecting rod is hinged on the connector and is connected with the connecting seat. The support threaded rod is provided with a plurality of handles 28 circumferentially distributed along the support threaded rod. Two adjacent sub-plates, wherein the end face of one sub-plate is provided with a vertical clamping groove, and the end face of the other sub-plate is provided with a vertical clamping strip 29 penetrating in the vertical clamping groove. The joints between the sub-plates are sealed by waterproof sealing strips.
Embodiment two differs from embodiment one in that:
referring to fig. 5 to 7, a plurality of stirring piles 31 are provided in the insulating soil layer along a direction perpendicular to the distribution direction of the first foundation pit and the second foundation pit, and pedestrian steel plates are supported on the stirring piles.
The embodiment also provides a construction method of the adjacent compact construction foundation pit combined supporting structure, the stirring pile is constructed through a stirring pile construction tool, the stirring pile construction tool comprises a stirring drill bit and stirring drill bit driving equipment for the construction of the stirring pile, the stirring drill bit comprises a drill rod 32 and a plurality of blade groups which are connected to the drill rod and distributed from top to bottom, the drill rod is of a hollow structure, and a guniting port 33 is formed in the lower end of the drill rod. The cover is equipped with spacing steel pipe 34 on the drilling rod, spacing steel pipe's internal diameter equals with the diameter of stirring stake, the blade group includes blade group, well blade group and lower blade group, go up blade group and include a plurality of last blade 35 that distribute along drilling rod circumference, go up the blade and extend along the horizontal direction, go up the blade slope setting, the one end of going up the blade links together with the drilling rod, the other end links together with spacing steel pipe, lower blade group includes a plurality of lower blades 36 that distribute along drilling rod circumference, lower blade extends along the horizontal direction, lower blade slope sets up, the one end of lower blade links together with the drilling rod, the other end links together with spacing steel pipe. The lower end face of the limit steel pipe, the lower side face of the lower blade and the lower side face of the upper blade are provided with cutting teeth 37. The peripheral surface of the spacing steel pipe is provided with a helical blade 38 extending along the circumferential direction of the spacing steel pipe, the direction of driving slurry to lift when the helical blade rotates along with the spacing steel pipe, the direction of driving slurry to lift when the upper blade rotates along with the spacing steel pipe are the same as the direction of driving slurry to lift when the lower blade rotates along with the spacing steel pipe, the slurry spraying opening is positioned in the spacing steel pipe, the distance from the lower end surface of the spacing steel pipe is more than 1 meter, the distance from the slurry spraying opening to the lower end surface of the spacing steel pipe is less than the distance from the slurry spraying opening to the upper end surface of the spacing steel pipe, and the width of the helical blade is less than 5 cm. The middle blade group is located between the upper blade group and the lower blade group, the middle blade group comprises a sliding sleeve 39 sleeved on a drill rod and a plurality of middle blades 40 arranged on the outer peripheral surface of the sliding sleeve and distributed along the circumference of the sliding sleeve, the upper end and the lower end of the sliding sleeve are respectively provided with a plurality of arc-shaped elastic pieces 41 which bulge towards the direction away from the drill rod, the arc-shaped elastic pieces are distributed along the circumference of the drill rod, one end, away from the sliding sleeve, of each arc-shaped elastic piece is connected with a connecting ring 42, the middle blades are disconnected with the limiting steel pipes, the plane where the middle blades are located is a horizontal plane, and the generatrix of the sliding sleeve is an arc-shaped arch bridge towards the direction away from the drill rod. The two sides of the middle blade in the width direction are provided with vertical strips 43, the vertical strips are disconnected with the sliding sleeve, and the inner diameter of the smallest part of the sliding sleeve is more than 2 mm larger than the diameter of the drill rod.
Claims (2)
1. The construction method of the adjacent compact construction foundation pit combined supporting structure is characterized by also comprising a limit steel pipe sleeved on the drill rod, wherein the inner diameter of the limit steel pipe is equal to the diameter of the stirring pile, the blade group comprises an upper blade group and a lower blade group, the upper blade group comprises a plurality of upper blades distributed along the circumference of the drill rod, the upper blades extend along the horizontal direction, the upper blades are obliquely arranged, one ends of the upper blades are connected with the drill rod, the other ends of the upper blades are connected with the limit steel pipe, the lower blade group comprises a plurality of lower blades distributed along the circumference of the drill rod, the lower blade extends along the horizontal direction, the lower blade is obliquely arranged, one end of the lower blade is connected with the drill rod, the other end of the lower blade is connected with the limit steel pipe, the lower end face of the limit steel pipe, the lower side face of the lower blade and the lower side face of the upper blade are all provided with cutting teeth, the peripheral surface of the limit steel pipe is provided with spiral blades extending along the circumferential direction of the limit steel pipe, the direction of driving slurry to lift when the spiral blades rotate along with the limit steel pipe, the direction of driving slurry to lift when the upper blade rotates along with the limit steel pipe are the same as the direction of driving slurry to lift when the lower blade rotates along with the limit steel pipe, a slurry spraying opening is positioned in the limit steel pipe, the distance between the slurry spraying opening and the lower end face of the limit steel pipe is more than 1 meter, the distance between the slurry spraying opening and the lower end face of the limit steel pipe is less than the distance between the slurry spraying opening and the upper end face of the limit steel pipe, the width of the spiral blades is below 5 cm, the blade group still includes well blade group, well blade group is located between blade group and the lower blade group, well blade group is including the cover establish the sliding sleeve on the drilling rod and set up a plurality of well blades of distributing along sliding sleeve circumference on the sliding sleeve outer peripheral face, and the upper and lower both ends of sliding sleeve are equipped with a plurality of arc shell fragments that bulge towards keeping away from the drilling rod direction respectively, and the circumference that the arc shell fragment was followed the drilling rod distributes, breaks off between well blade and the spacing steel pipe, the plane at well blade place is the horizontal plane, the generating line of sliding sleeve is the arc of the direction arched bridge towards keeping away from the drilling rod.
2. The construction method of the adjacent compact construction foundation pit combined supporting structure according to claim 1, wherein vertical strips are arranged on two sides of the middle blade in the width direction, the vertical strips are disconnected with the sliding sleeve, and the inner diameter of the smallest part of the sliding sleeve is more than 2 mm larger than the diameter of the drilling rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111210983.8A CN113818447B (en) | 2021-10-18 | 2021-10-18 | Adjacent compact construction foundation pit combined supporting structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111210983.8A CN113818447B (en) | 2021-10-18 | 2021-10-18 | Adjacent compact construction foundation pit combined supporting structure and construction method thereof |
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| CN113818447A CN113818447A (en) | 2021-12-21 |
| CN113818447B true CN113818447B (en) | 2023-06-13 |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3558933B2 (en) * | 1999-10-13 | 2004-08-25 | 財団法人鉄道総合技術研究所 | Ground improvement method |
| JP2002047642A (en) * | 2000-08-04 | 2002-02-15 | Sekisui House Ltd | Ground improvement agitating machine with corotation prevention mechanism |
| CN103806840B (en) * | 2014-01-27 | 2016-05-11 | 中冶建筑研究总院有限公司 | One-way spiral half soil compaction drill bit and one-way spiral half Squeezing Soil Pile construction technology |
| JP6273333B1 (en) * | 2016-10-13 | 2018-01-31 | 株式会社絹田熔工 | Method for forming soil cement pile |
| CN106759378B (en) * | 2017-01-03 | 2019-03-26 | 中国建筑第八工程局有限公司 | Level is to the construction method for drawing anchor cable |
| JP6837047B2 (en) * | 2018-12-27 | 2021-03-03 | 株式会社エステック | Excavation agitator and ground improvement machine equipped with excavation agitator |
| CN210031842U (en) * | 2019-04-02 | 2020-02-07 | 中国建筑第八工程局有限公司 | Combined supporting system for adjacent deep foundation pit based on row piles, connecting beams and counter-pulling anchor cables |
| CN110258544A (en) * | 2019-07-26 | 2019-09-20 | 北京中岩大地科技股份有限公司 | The stirring drill bit of deep-layer stirring is realized based on drop resistance mode |
| CN211922630U (en) * | 2019-10-29 | 2020-11-13 | 上海市政工程设计研究总院（集团）有限公司 | Steel-pipe pile assembled hat beam |
| CN112982440A (en) * | 2021-03-16 | 2021-06-18 | 浙江理工大学 | Deep foundation pit supporting structure and deep foundation pit supporting method based on limited space |
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