CN114622595A - Three-stage old rubble retaining wall reinforcing method for abutting deep foundation pit supporting structure - Google Patents
Three-stage old rubble retaining wall reinforcing method for abutting deep foundation pit supporting structure Download PDFInfo
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- CN114622595A CN114622595A CN202210339204.2A CN202210339204A CN114622595A CN 114622595 A CN114622595 A CN 114622595A CN 202210339204 A CN202210339204 A CN 202210339204A CN 114622595 A CN114622595 A CN 114622595A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
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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
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
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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
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Architecture (AREA)
- Piles And Underground Anchors (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The application discloses third-level old rubble retaining wall reinforcing method adjoined to deep foundation pit supporting structure relates to the technical field of retaining wall reinforcement, and comprises the following steps: s1, constructing a plurality of miniature steel pipe piles on the platform surface close to the second-stage retaining wall, adjusting a reinforcing tool after the steel pipes of the miniature steel pipe piles are inserted to a preset depth to increase the connection strength between the miniature steel pipe piles and the earthwork, and then grouting into the steel pipes; s2, connecting the miniature steel pipe piles into a whole by a construction capping beam; s3, removing the first-stage retaining wall, and backfilling the original ground to the elevation required by the pile driver operation; s4, hanging a net and spraying concrete on the outer side of the earthwork of the miniature steel pipe pile, and then performing support pile construction; s5, beating the reinforced soil nails; and S6, constructing the crown beam for connecting the support piles into a whole. This application has avoided consolidating the effect that second grade retaining wall produced the influence to deep basal pit support.
Description
Technical Field
The invention relates to the technical field of retaining wall reinforcement, in particular to a method for reinforcing a three-stage old rubble retaining wall adjoined with a deep foundation pit supporting structure.
Background
With the development of urbanization, the situation of newly building projects in narrow places of old urban areas continuously appears, and because the urban land is in shortage, the newly built projects are often provided with basements, and the deep foundation pit projects constructed for building basements become the central importance for ensuring the construction quality safety. In the existing method for reinforcing the wool retaining wall, in order to ensure the reinforcing strength, a foundation pit is usually supported by three stages of retaining walls.
In the actual construction, first order retaining wall 1 and second level retaining wall 2 are the echelonment and arrange, and the three plane that corresponds is ground, platform face, slope top surface from bottom to top in proper order, when meetting tertiary rubble retaining wall and bordering on deep basal pit retaining pile and retaining pile 7 and be located the platform face below (as shown in fig. 1), first order retaining wall 1 can not avoid needing to demolish. And adopt traditional pile to carry the method to consolidate second grade retaining wall 2, pile at the corner and carry the presser foot and can occupy the working face of retaining pile 7, consolidate second grade retaining wall 2 promptly and can influence the construction of retaining pile 7.
Therefore, it is necessary to provide a method of reinforcing a retaining wall without affecting the construction of adjoining deep foundation pit supporting structures.
Disclosure of Invention
In order to avoid influencing bordering deep foundation pit supporting structure when consolidating second grade retaining wall, this application provides a bordering deep foundation pit supporting structure's old rubble retaining wall of tertiary method.
The application provides a third grade old rubble retaining wall reinforcement method who borders deep basal pit supporting construction adopts following technical scheme:
a three-level old rubble retaining wall reinforcing method for a continuous deep foundation pit supporting structure comprises the following steps:
s1, constructing a plurality of miniature steel pipe piles on the platform surface close to the second-stage retaining wall, adjusting a reinforcing tool after the steel pipes of the miniature steel pipe piles are inserted to a preset depth to increase the connection strength between the miniature steel pipe piles and the earthwork, and then grouting into the steel pipes;
s2, constructing a capping beam to connect the miniature steel pipe piles into a whole;
s3, removing the first-stage retaining wall, and backfilling the original ground to the elevation required by the pile driver operation;
s4, hanging a net and spraying concrete on the outer side of the earthwork of the miniature steel pipe pile, and then performing support pile construction;
s5, beating the reinforced soil nails;
and S6, constructing the crown beam for connecting the support piles into a whole.
By adopting the technical scheme, after the first-stage retaining wall is removed, the miniature steel pipe pile replaces the first-stage retaining wall to bear the load of the upper second-stage retaining wall, so that the second-stage retaining wall is reinforced, a construction surface is created for a deep foundation pit supporting structure, the safety of foundation pit construction is ensured, and the influence of reinforcing the second-stage retaining wall on the deep foundation pit supporting is avoided; in addition, the elevation of the support piles adjoining the deep foundation pit is increased, the reinforced soil nails are added, the foundation pit supporting structure is used as the redundant support of the retaining wall, the occurrence of the condition that the retaining wall is integrally landslide is prevented, the stability and the safety of the retaining wall are further improved, the disturbance of the integral reinforcement operation on the soil body of the existing retaining wall is minimized, the safety construction in the reinforcement process is ensured, and a good reference function is provided for the construction of subsequent similar engineering.
Preferably, the reinforcing tool comprises an inserted rod which is in sliding fit with the steel pipe of the miniature steel pipe pile along the radial direction of the miniature steel pipe pile, and the reinforcing tool further comprises a driving assembly which is used for driving the inserted rod to penetrate through the steel pipe of the miniature steel pipe pile and be inserted into the earth;
in step S1, the insert rod is driven by the driving assembly to be inserted outward into the earth to increase the connection strength between the steel pipe and the earth of the micro steel pipe pile.
Through adopting above-mentioned technical scheme, increased the joint strength between the steel pipe of miniature steel-pipe pile and the earth around it, and then improved the reinforcement effect to second grade retaining wall.
Preferably, the driving assembly comprises a driving rod coaxially rotating in the inner cavity of the steel pipe of the miniature steel pipe pile, a cam coaxially and fixedly arranged on the driving rod, and a power part for driving the driving rod to rotate.
Through adopting above-mentioned technical scheme, start power spare drive actuating lever and cam and rotate, the inserted bar outwards stretches out under the effect of cam and inserts to the earthwork in, realizes the drive to the inserted bar.
Preferably, the maximum outer diameter of the cam is smaller than the inner diameter of the steel pipe of the miniature steel pipe pile.
By adopting the technical scheme, a gap is reserved between the outer wall of the cam and the inner wall of the steel pipe, so that a constructor can conveniently insert the driving assembly into the steel pipe after the steel pipe of the miniature steel pipe pile is inserted and beaten.
Preferably, two insertion rods are symmetrically arranged on two sides of the miniature steel pipe pile in the arrangement direction, and a wedge-shaped surface is arranged on one side, back to the second-stage retaining wall, of each insertion rod;
and step S11 is further arranged between the step S1 and the step S2, in the step S11, a secondary reinforcing groove is dug at the outer side of the miniature steel pipe pile to reach the required elevation for pile machine operation of the support pile, before the slurry in the steel pipe is initially set, a secondary reinforcing member is inserted into the earthwork at the outer side of the miniature steel pipe pile, two push rods in the secondary reinforcing member apply acting force to the two wedge-shaped surfaces, and the inserted rod is continuously pushed outwards until the push rods are connected with the inserted rod.
Through adopting above-mentioned technical scheme, because the biggest external diameter of cam is less than the internal diameter of steel pipe for when cam drive inserted bar outwards removed, can't outwards release the inserted bar to maximum distance, through the cooperation of secondary reinforcement and wedge face, make the inserted bar continue outwards to remove under the effect of push rod, increased the depth that the inserted bar inserted in the earthwork, further improvement the stability of being connected between steel pipe and the earthwork, and then improved the reinforcing effect to retaining wall.
Preferably, the insertion rod is provided with a slot matched with the push rod.
Through adopting above-mentioned technical scheme, when the one end of push rod was inserted in the slot, stopped promoting the secondary reinforcement, realized being connected between secondary reinforcement and the inserted bar.
Preferably, the secondary reinforcing member is provided with a predetermined reinforcing bar extending outside the earth, and the concrete connects the predetermined reinforcing bars into a whole in step S4.
Through adopting above-mentioned technical scheme, after the earthwork department in the miniature steel-pipe pile outside hangs the net and spouts the concrete, connect a plurality of secondary reinforcement and miniature steel-pipe pile into whole, increased the wholeness and the reinforced strength to the reinforced structure of second grade retaining wall.
Preferably, the inserted rod is in snap fit with a steel pipe of the miniature steel pipe pile.
Through adopting above-mentioned technical scheme, realized being connected between the steel pipe of inserted bar and miniature steel-pipe pile.
Preferably, in step S1, a brick fence is built on the top end of the second-stage retaining wall.
By adopting the technical scheme, buildings on the slope surface are protected, and the safety of the buildings on the slope surface in the construction process is ensured.
In summary, the present application includes at least one of the following beneficial technical effects:
1. after the first-stage retaining wall is removed, the miniature steel pipe piles replace the first-stage retaining wall to bear the load of the upper second-stage retaining wall, so that the second-stage retaining wall is reinforced, a construction surface is created for a deep foundation pit supporting structure, the safety of foundation pit construction is guaranteed, and the influence of reinforcing the second-stage retaining wall on the deep foundation pit supporting is avoided;
2. the supporting pile elevation of the adjacent deep foundation pit is increased, the reinforced soil nails are added, and the foundation pit supporting structure is used as the redundant support of the retaining wall, so that the condition that the retaining wall is integrally landslide is prevented, and the stability and the safety of the retaining wall are further improved;
3. through the cooperation of secondary reinforcement and wedge for the inserted bar continues outwards to remove under the effect of push rod, has increased the degree of depth that the inserted bar inserted in the earthwork, further improvement the stability of being connected between steel pipe and the earthwork, and then improved the reinforcement effect to retaining wall.
Drawings
Fig. 1 is a schematic view of a background art stowage reinforcement method and a floor, a terrace surface and a slope top surface.
Fig. 2 is a schematic view illustrating reinforcement of a micro steel pipe pile according to an embodiment.
Fig. 3 is a partial structural schematic diagram of a reinforcement tool in an embodiment.
Fig. 4 is a schematic sectional view showing a connection structure between the plunger and the steel pipe and a dimensional relationship between the cam and the steel pipe in the embodiment.
Fig. 5 is a partial structural schematic diagram of a connection relationship between the secondary reinforcing tool and the insert rod in the specific embodiment.
Fig. 6 is a schematic top view of a connection relationship between the secondary reinforcement tool and the insert rod according to the embodiment.
Fig. 7 is a schematic sectional view illustrating a construction of a support pile according to an embodiment.
Description of reference numerals:
1. a first-stage retaining wall;
2. a second-stage retaining wall;
3. miniature steel pipe piles; 31. a steel pipe; 311. a sliding groove; 312. a clamping groove;
4. inserting a rod; 41. clamping the bulges; 42. a wedge-shaped surface; 43. a slot;
5. a drive assembly; 51. a drive rod; 52. a cam; 53. a motor; 54. a support;
6. a secondary reinforcement; 61. a cross bar; 62. a push rod; 63. presetting a steel bar;
7. supporting piles;
8. reinforcing steel bar soil nails;
9. bricking a fence;
10. and (5) secondary reinforcing groove.
Detailed Description
The present application is described in further detail below with reference to figures 2-7.
The embodiment of the application discloses a three-level old rubble retaining wall reinforcing method for a bordering deep foundation pit supporting structure, which is used for reinforcing a second-level retaining wall 2 bordering the deep foundation pit supporting structure.
Referring to fig. 2, a brick enclosing wall 9 is arranged at the edge of the second-stage retaining wall 2 on the slope top surface to enclose buildings on the slope surface and ensure the safety of the buildings on the slope surface in the construction process.
One side of second grade retaining wall 2 is equipped with miniature steel-pipe pile 3, and miniature steel-pipe pile 3 evenly lays a plurality ofly along the extending direction interval of second grade retaining wall 2.
Referring to fig. 2 and 3, the steel pipe 31 of the micro steel pipe pile 3 is provided with a reinforcement tool for increasing the stability of the connection between the micro steel pipe pile and the surrounding earth. The reinforcing tool comprises an insert rod 4 which is matched with the steel pipe 31 in a sliding mode, a driving assembly 5 used for driving the insert rod 4 to be inserted into the earth outwards, and a secondary reinforcing member 6 used for further driving the insert rod 4 to extend outwards.
Two inserting rods 4 are symmetrically arranged on two radial sides of the steel pipe 31, and multiple groups of inserting rods 4 are uniformly distributed along the axis direction of the steel pipe 31.
Referring to fig. 3 and 4, the insertion rod 4 is slidably fitted to the steel pipe 31 along the radial direction of the steel pipe 31, a sliding groove 311 for allowing the insertion rod 4 to slide is formed in the steel pipe 31, and the insertion rod 4 is guided between the insertion rod 4 and the sliding groove 311 in a key connection manner. One of them lateral wall of the sliding groove 311 is provided with a clamping groove 312, the outer wall of the inserted link 4 is provided with a clamping protrusion 41 matched with the clamping groove 312, and when the inserted link 4 does not extend out of the outer wall of the steel pipe 31, the clamping protrusion 41 is embedded into the clamping groove 312 to limit the movement of the inserted link 4 relative to the steel pipe 31.
The driving assembly 5 comprises a driving rod 51 coaxially arranged with the steel pipe 31, a cam 52 coaxially fixed on the outer side of the driving rod 51, and a motor 53 for driving the driving rod 51 to rotate, wherein the maximum outer diameter of the cam 52 is smaller than the inner diameter of the steel pipe 31. In order to facilitate the installation and positioning of the driving rod 51 by constructors, the top end of the steel pipe 31 is connected with a bracket 54 in a pressing mode through bolts, the motor 53 is fixed on the bracket 54, the output shaft of the motor 53 is coaxially fixed with the top end of the driving rod 51, and the driving rod 51 is connected to the bracket 54 in a rotating mode.
Referring to fig. 2, 5 and 6, the secondary reinforcement member 6 is U-shaped and includes a cross rod 61 and push rods 62 integrally formed at two ends of the cross rod 61, the push rods 62 are perpendicular to the cross rod 61, and a slanted support plate for increasing the connection strength between the push rods 62 and the cross rod 61 is disposed between the push rods 62 and the cross rod 61. The surface of inserted bar 4 towards the earthwork outside sets up to wedge-shaped surface 42, and the one end that push rod 62 deviates from horizontal pole 61 is used for cooperating with wedge-shaped surface 42, applys the effort to inserted bar 4, makes inserted bar 4 deviate from steel pipe 31 and removes.
The wedge-shaped surface 42 of the inserted link 4 is provided with a slot 43, and one end of the push rod 62 departing from the cross rod 61 is inserted into the slot 43, so that the connection between the push rod 62 and the inserted link 4 is realized.
A preset steel bar 63 perpendicular to the cross bar 61 is fixed in the middle of the outer wall of the cross bar 61.
In order to connect a plurality of secondary reinforcements 6 corresponding to the same micro steel pipe pile 3, the plurality of secondary reinforcements 6 are fixed by the same connecting plate.
A three-level old rubble retaining wall reinforcing method for a continuous deep foundation pit supporting structure comprises the following steps:
s1, constructing the miniature steel pipe pile 3: constructing miniature steel pipe piles 3 on a platform surface close to the second-stage retaining wall 2, wherein the insertion depth of the bottom ends of the miniature steel pipe piles 3 is positioned below the lowest point of the first-stage retaining wall 1, and a plurality of miniature steel pipe piles 3 are uniformly distributed at intervals along the extension direction of the second-stage retaining wall 2;
after the steel pipe 31 of the miniature steel pipe pile 3 is inserted to a preset depth, the driving rod 51 and the cam 52 are driven by the starting motor 53, the inserted link 4 moves outwards under the action of the cam 52 and is inserted into the soil around the steel pipe 31, and the connection strength between the steel pipe 31 and the surrounding soil is increased;
the bracket 54 is removed from the steel duct 31, taken along with the drive rod 51, cam 52 and motor 53, and the steel duct 31 is grouted to a predetermined amount.
S2, excavating a secondary reinforcing groove 10: and excavating a secondary reinforcing groove 10 on one side of the miniature steel pipe pile 3 back to the second-stage retaining wall 2 to the elevation required by pile machine operation of the support pile 7, before initial setting of slurry in the steel pipe 31, inserting a secondary reinforcing member 6 into earthwork on the outer side of the miniature steel pipe pile 3 until the push rod 62 abuts against the wedge-shaped surface 42 of the inserted link 4, continuously pushing the secondary reinforcing member 6 to move towards the miniature steel pipe pile 3 until the push rod 62 is inserted into the slot 43, and stopping inserting the secondary reinforcing member 6.
S3, construction of the capping beam: after the miniature steel pipe piles 3 are formed into piles, a capping beam is constructed to connect the top ends of the miniature steel pipe piles 3 into a whole.
S4, removing the retaining wall: and (3) removing the first-stage retaining wall 1, and backfilling the original ground to the elevation required by the operation of the pile machine to form a pile machine construction platform surface.
S5, reinforcing the outside earthwork of the miniature steel pipe pile 3: the net shotcrete is hung outside the earthwork of the miniature steel pipe pile 3, a plurality of preset reinforcing steel bars 63 are connected into a whole, redundant parts of the preset reinforcing steel bars 63 are cut off, and then a plurality of secondary reinforcing members 6 and the miniature steel pipe pile 3 are connected into a whole, so that the integrity and the reinforcing strength of the reinforcing structure of the second-stage retaining wall 2 are increased.
S6, construction of the support pile 7: and (5) constructing the support pile 7 on the pile foundation construction platform surface through a pile machine.
S7, beating the reinforced soil nail 8: and (3) inserting and driving the reinforced soil nails 8 between the adjacent support piles 7 in an inclined manner, wherein the inclined angle of the reinforced soil nails 8 is inclined downwards by 20 degrees in the horizontal plane.
S7, construction of the crown beam: and constructing a crown beam at the top end of the support piles 7, and fixing the crown beam and one end of the reinforced soil nail 8 after connecting the support piles 7 into a whole.
As shown in fig. 2, the distribution area of the inserted link 4 in the height direction is located between the height of the rotary drilling rig construction platform and the corresponding height between the slope top platforms.
According to the method for reinforcing the three-stage old rubble retaining wall adjoined with the deep foundation pit supporting structure, after the first-stage retaining wall 1 is dismantled, the miniature steel pipe piles 3 replace the first-stage retaining wall 1 to bear the load of the upper second-stage retaining wall 2, so that the second-stage retaining wall 2 is reinforced, a construction surface is created for the deep foundation pit supporting structure, the safety of foundation pit construction is ensured, and the influence of the second-stage retaining wall 2 on the deep foundation pit supporting is avoided; in addition, the elevation of the retaining pile 7 adjoining the deep foundation pit is increased, the reinforced soil nail 8 is added, and the foundation pit supporting structure is used as the redundant support of the retaining wall, so that the condition that the retaining wall is integrally landslide is prevented, and the stability and the safety of the retaining wall are further improved; before the initial setting of thick liquid in the steel pipe 31 of miniature steel-pipe pile 3, still continue to outwards extract through secondary reinforcement 6 drive inserted bar 4, and follow-up spout concrete through hanging the net and connect a plurality of secondary reinforcements 6 into whole through predetermineeing reinforcing bar 63, guaranteed miniature steel-pipe pile 3's supporting intensity.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A three-level old rubble retaining wall reinforcing method for a continuous deep foundation pit supporting structure is characterized by comprising the following steps:
s1, constructing a plurality of miniature steel pipe piles (3) on the platform surface close to the second-stage retaining wall (2), adjusting a reinforcing tool after the steel pipes (31) of the miniature steel pipe piles (3) are inserted to a preset depth to increase the connection strength between the miniature steel pipe piles (3) and the earth, and then grouting into the steel pipes (31);
s2, connecting the miniature steel pipe piles (3) into a whole by using construction capping beams;
s3, removing the first-stage retaining wall (1), and backfilling the original ground to the elevation required by the operation of the pile machine;
s4, hanging a net and spraying concrete on the outer side of the earthwork of the miniature steel pipe pile (3), and then constructing a support pile (7);
s5, beating the reinforced soil nails (8);
and S6, constructing the crown beam for connecting the support piles (7) into a whole.
2. The method for reinforcing a three-stage old rubble retaining wall bordering a deep foundation pit supporting structure, according to claim 1, wherein: the reinforcing tool comprises an inserted rod (4) which is in sliding fit with a steel pipe (31) of the miniature steel pipe pile (3) along the radial direction of the miniature steel pipe pile (3), and the reinforcing tool further comprises a driving assembly (5) which is used for driving the inserted rod (4) to penetrate through the steel pipe (31) of the miniature steel pipe pile (3) and be inserted into the earth;
in step S1, the insertion rod (4) is driven by the driving unit (5) to be inserted outward into the earth, so as to increase the connection strength between the steel pipe (31) of the micro steel pipe pile (3) and the earth.
3. The method for reinforcing a three-stage old rubble retaining wall bordering a deep foundation pit supporting structure, according to claim 2, wherein: the driving assembly (5) comprises a driving rod (51) coaxially rotating in the inner cavity of the steel pipe (31) of the miniature steel pipe pile (3), a cam (52) coaxially and fixedly arranged on the driving rod (51), and a power part for driving the driving rod (51) to rotate.
4. A method of reinforcing a three-stage old rubble retaining wall bordering a deep foundation pit supporting structure, as claimed in claim 3, wherein: the maximum outer diameter of the cam (52) is smaller than the inner diameter of the steel pipe (31) of the miniature steel pipe pile (3).
5. The method for reinforcing a three-stage old rubble retaining wall bordering a deep foundation pit supporting structure, according to claim 4, wherein: two insertion rods (4) are symmetrically arranged on two sides of the arrangement direction of the miniature steel pipe piles (3), and a wedge-shaped surface (42) is arranged on one side of each insertion rod (4) back to the second-stage retaining wall (2);
and a step S11 is further arranged between the steps S1 and S2, in the step S11, a secondary reinforcing groove (10) is dug at the outer side of the miniature steel pipe pile (3) to reach the required elevation for pile machine operation of the support pile (7), before the slurry in the steel pipe (31) is initially set, a secondary reinforcing member (6) is inserted into the earth at the outer side of the miniature steel pipe pile (3), two push rods (62) in the secondary reinforcing member (6) apply acting force to the two wedge-shaped surfaces (42), and the inserted rod (4) is continuously pushed outwards until the push rods (62) are connected with the inserted rod (4).
6. The method for reinforcing a three-stage old rubble retaining wall bordering a deep foundation pit supporting structure, according to claim 5, wherein: the inserting rod (4) is provided with a slot (43) matched with the push rod (62).
7. The method for reinforcing a three-stage old rubble retaining wall bordering a deep foundation pit supporting structure, according to claim 5, wherein: and a preset reinforcing steel bar (63) is arranged on the secondary reinforcing member (6), the preset reinforcing steel bar (63) extends out of the earthwork, and in the step S4, the concrete connects a plurality of preset reinforcing steel bars (63) into a whole.
8. The method for reinforcing a three-stage old rubble retaining wall bordering a deep foundation pit supporting structure, according to claim 2, wherein: the inserted rod (4) is in clamping fit with the steel pipe (31) of the miniature steel pipe pile (3).
9. The method for reinforcing a three-stage old rubble retaining wall bordering a deep foundation pit supporting structure, according to claim 1, wherein: in step S1, a bricked fence (9) is built on the top end of the second-stage retaining wall (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210339204.2A CN114622595B (en) | 2022-04-01 | 2022-04-01 | Three-stage old rubble retaining wall reinforcing method for adjoining deep foundation pit supporting structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210339204.2A CN114622595B (en) | 2022-04-01 | 2022-04-01 | Three-stage old rubble retaining wall reinforcing method for adjoining deep foundation pit supporting structure |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070092343A1 (en) * | 2005-10-19 | 2007-04-26 | Cargill Kevin W | Micropile Retaining Wall |
| CN214460477U (en) * | 2021-02-24 | 2021-10-22 | 中建八局第三建设有限公司 | Combined foundation pit support |
| CN214832849U (en) * | 2021-06-30 | 2021-11-23 | 广东蒲阳基础工程有限公司 | Bifurcated steel pipe pile foundation |
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2022
- 2022-04-01 CN CN202210339204.2A patent/CN114622595B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070092343A1 (en) * | 2005-10-19 | 2007-04-26 | Cargill Kevin W | Micropile Retaining Wall |
| CN214460477U (en) * | 2021-02-24 | 2021-10-22 | 中建八局第三建设有限公司 | Combined foundation pit support |
| CN214832849U (en) * | 2021-06-30 | 2021-11-23 | 广东蒲阳基础工程有限公司 | Bifurcated steel pipe pile foundation |
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| CN114622595B (en) | 2023-06-13 |
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