CN112942368B - Deep foundation pit construction method with side wall supporting function - Google Patents
Deep foundation pit construction method with side wall supporting function Download PDFInfo
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- CN112942368B CN112942368B CN202110149489.9A CN202110149489A CN112942368B CN 112942368 B CN112942368 B CN 112942368B CN 202110149489 A CN202110149489 A CN 202110149489A CN 112942368 B CN112942368 B CN 112942368B
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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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
Abstract
The application relates to a deep foundation pit construction method with a side wall supporting function, which comprises the following steps: s1, cleaning a construction site, and performing row pile supporting to form a first reinforcing wall; s2, carrying out slope releasing excavation towards the center to form a slope releasing surface, drilling reinforcing holes on the slope releasing surface, inserting the composite anchor rods into the reinforcing holes, and carrying out grouting reinforcement; s3, performing row pile supporting at the bottom end of the slope surface to form a second reinforcing wall, and performing cement reinforcing on the slope surface; s4, fixing the slope releasing surface and the composite anchor rod together through a composite plate; s5, downwards excavating a foundation pit, drilling a connecting hole in the second reinforcing wall, inserting a composite anchor rod into the connecting hole, and grouting and reinforcing the connecting hole; s6, reinforcing the second wall through the stabilizing plate, and fixing the stabilizing plate and the anchor rod through the combined plate; s7, continuing to excavate the deep foundation pit downwards to a proper depth, and performing reinforcement treatment on the bottom of the deep foundation pit.
Description
Technical Field
The application relates to the technical field of foundation pit engineering, in particular to a deep foundation pit construction method with a side wall supporting function.
Background
The deep foundation pit refers to an engineering with excavation depth of more than 5 meters (including 5 meters), or with excavation depth of less than 5 meters, but particularly complex geological conditions and underground pipelines; the foundation pit engineering mainly comprises two aspects of earth excavation and foundation pit supporting, and the stability of the foundation pit influences the safety of the building engineering on the foundation pit.
The existing deep foundation pit construction method is that the deep foundation pit is excavated downwards layer by layer at a construction site according to construction requirements, before excavation, a hole is drilled underground at the periphery of a planned area of the deep foundation pit, a plurality of reinforcing walls surrounding the deep foundation pit are poured, in the process of excavating downwards along the reinforcing walls, a deep hole is formed in each reinforcing wall, an anchor rod is inserted into the hole, grouting reinforcement is carried out on the hole where the anchor rod is located through grouting equipment, the deep foundation pit is excavated to a specified depth, and the construction of the deep foundation pit is completed.
In view of the above related technologies, the inventor thinks that there is a defect that the effect of supporting and reinforcing the side wall of the foundation pit is poor by using an anchor rod to penetrate a reinforced wall for supporting.
Disclosure of Invention
In order to improve the defect that the effect of supporting and reinforcing the side wall of the foundation pit is poor by a mode that the anchor rod penetrates through the reinforced wall for supporting, the application provides a deep foundation pit construction method with a side wall supporting function.
The application provides a deep foundation pit construction method with lateral wall support function adopts following technical scheme:
a construction method of a deep foundation pit with a side wall supporting function comprises the following steps:
s1, clearing a construction site, and arranging piles at the periphery of the deep foundation pit area through a triaxial mixing pile machine to support to form a first reinforced wall;
s2, carrying out slope releasing excavation from the top of the first reinforcing wall to the inside of the space enclosed by the first reinforcing wall to form a slope releasing surface, digging a foundation pit to the bottom end of the slope releasing surface, drilling a hole on the slope releasing surface through drilling equipment, penetrating the first reinforcing wall to form a reinforcing hole, inserting a composite anchor rod into the reinforcing hole, and carrying out grouting reinforcement;
s3, performing pile arrangement supporting on the edge of the deep foundation pit area at the bottom end of the slope surface through a three-axis mixing pile machine to form a second reinforcing wall, and performing cement reinforcing on the slope surface to enable the cement reinforcing surface to cover the second reinforcing wall;
s4, moving the composite board to enable the composite anchor rod to be tightly abutted against the inner wall of the reinforcing pipe of the composite board, and fixedly paving the composite board on a cement surface on the slope surface;
s5, continuously excavating a foundation pit downwards along the space surrounded by the second reinforcing wall, forming a connecting hole penetrating through the first reinforcing wall on the second reinforcing wall through drilling equipment, inserting a composite anchor rod into the connecting hole, and grouting and reinforcing the connecting hole;
s6, moving the stabilizing plate to enable the composite anchor rods on the second reinforcing wall to be positioned in the middle holes of the stabilizing plate, fixedly connecting the stabilizing plate to the second reinforcing wall, moving the composition plate to enable the composite anchor rods on the second reinforcing wall to be tightly abutted against the inner wall of the reinforcing pipe of the composition plate, and fixing the composition plate on the stabilizing plate;
and S7, continuously excavating the foundation pit downwards to a proper depth, and reinforcing the bottom of the foundation pit.
By adopting the technical scheme, the supporting protection of the deep foundation pit side wall is further improved by the first peripheral reinforcing wall, the water immersion is reduced, the slope surface is placed, the reinforcing effect of the first reinforcing wall is effectively improved by the composite anchor rods on the slope surface, the first reinforcing wall and the second reinforcing wall are effectively connected and fixed by the composite anchor rods on the second reinforcing wall, the supporting effect of the deep foundation pit side wall is further improved, the part of the second reinforcing wall extending out of the second reinforcing wall is further supported by the second reinforcing wall through the stabilizing plate and the combination plate, the supporting and reinforcing effect of the deep foundation pit side wall is further improved, and the safety of the deep foundation pit is further improved.
Optionally, the composite anchor rod comprises a grouting pipe and a plurality of steel bars, the steel bars are fixedly connected to the circumferential outer wall of the grouting pipe, and the grouting pipe is provided with a plurality of grouting holes.
Through adopting above-mentioned technical scheme, a plurality of reinforcing bars surround the slip casting pipe, effectually consolidate the protection to the slip casting pipe, and the slip casting pore pair through the slip casting pipe reinforces the slip casting hole and connecting hole simultaneously and consolidates, has improved compound stock and has strutted reinforced stability to the deep basal pit lateral wall, and then has improved the reinforced effect of deep basal pit lateral wall support.
Optionally, the side wall of the steel bar far away from the grouting pipe is abutted with a plurality of fixing ring sleeves, and the circumferential inner wall of each fixing ring sleeve tightly pushes the steel bar against the grouting pipe.
By adopting the technical scheme, the stability of the reinforcing steel bar fixed on the grouting pipe is effectively improved by the fixing ring sleeve, and the strength of the composite anchor rod is further improved.
Optionally, the fixed cover of slip casting pipe outer wall is equipped with a plurality of protection ring pads, and the reinforcing bar will protect the ring pad to slip casting pipe top tightly.
Through adopting above-mentioned technical scheme, the protection cushion is effectual protects the slip casting pipe, has still improved the fixed stability of reinforcing bar and slip casting pipe simultaneously.
Optionally, the combination board includes a bottom plate, a reinforcing pipe and a top plate, the reinforcing wall is communicated with the bottom plate, one end of the reinforcing pipe, which is far away from the bottom plate, is communicated with the top plate, and the inner wall of the reinforcing pipe is in interference fit with the circumferential side wall of the composite anchor rod.
Through adopting above-mentioned technical scheme, the compoboard is effectual fixes the compound stock by the part that the deep basal pit lateral wall stretches out, fixes with the lateral wall of deep basal pit simultaneously, and then has improved the stability of strutting fixedly to the deep basal pit lateral wall.
Optionally, the top and the bottom of the side wall of the bottom plate, which is close to the top plate, are both fixedly provided with rib plates fixedly connected with the outer side wall of the reinforcing pipe.
Through adopting above-mentioned technical scheme, the gusset is effectual to support the reinforcement pipe and consolidate, and then has improved the fixed stability of reinforcement pipe to compound stock.
Optionally, the stabilizing plate comprises two transverse plates and a plurality of connecting plates, the two transverse plates are arranged in parallel, the transverse plates are fixedly connected to the side wall, away from the first reinforcing wall, of the second reinforcing wall, the connecting plates are fixedly connected to the side wall, away from the second reinforcing wall, of the two transverse plates, and the space between the two transverse plates is used for the composite anchor rod of the second reinforcing wall to pass through.
Through adopting above-mentioned technical scheme, the diaphragm is effectual fixes the second reinforced wall, provides the fixed stay for the compoboard simultaneously, and then has improved the fixed effect to the compound stock on the second reinforced wall, has improved the fixed effect of firm board and second reinforced wall simultaneously, and then has improved deep basal pit lateral wall and has strutted reinforced (rfd) effect, has improved deep basal pit's security.
Optionally, a placing groove for placing the bottom plate is formed in the position, close to the composite anchor rod, on the side wall, far away from the second reinforcing wall, of the transverse plate.
Through adopting above-mentioned technical scheme, when making compoboard and steadying board fix together, the bottom plate is fixed with standing groove inner wall butt, and the effectual fixed effect to the bottom plate that has improved has then improved the fixed stability of compoboard and steadying board.
Optionally, the relative lateral wall of bottom plate and roof is parallel to each other, and the equal fixedly connected with baffle in the position that two diaphragms are close to the standing groove, and the position that the baffle is close to the lateral wall of standing groove, keeps away from the diaphragm has set firmly the limiting plate, and the lateral wall that the limiting plate is close to the diaphragm is close to the lateral wall coplane of bottom plate with the roof, and the bottom plate bottom has set firmly the butt plate, slides in the space enclosed between limiting plate, roof and the diaphragm and is connected with the lockplate, lockplate bottom and butt plate butt.
Through adopting above-mentioned technical scheme, the bottom plate is fixed back in the standing groove, removes lockplate, makes lockplate be close to the one end butt of diaphragm with limiting plate and bottom plate simultaneously, further fixes the position of compoboard, has improved the stability that compoboard and firm board are fixed.
Optionally, the transverse plate is closely attached to the second reinforcing wall near the side wall of the second reinforcing wall.
Through adopting above-mentioned technical scheme, cross board and the inseparable laminating of second reinforced wall, effectual improvement with the fixed area of second reinforced wall butt, and then improved the fixed stability of second reinforced wall, improved deep basal pit and strutted reinforced effect.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the composite anchor rod effectively connects and fixes the first reinforcing wall and the second reinforcing wall, meanwhile, a grouting pipe in the composite anchor rod effectively improves the efficiency of grouting the reinforcing holes and the connecting holes, and simultaneously, the reinforcing steel bars effectively improve the self strength of the composite anchor rod, so that the supporting and reinforcing effect on the side wall of the deep foundation pit is improved, and the safety of the deep foundation pit is improved;
2. the stabilizing plate is fixedly connected with the second reinforcing wall, and the combined plate fixed with the composite anchor rod on the second reinforcing wall is fixed with the stabilizing plate, so that the fixing effect of the composite anchor rod is improved, the stability of the second reinforcing wall fixing support is improved, and the fixing effect of the deep foundation pit support is improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present application;
FIG. 2 is a partial cross-sectional view showing a composite panel;
fig. 3 is a schematic view showing only the composite anchor;
FIG. 4 is a partial cross-sectional view showing the guard ring pad;
FIG. 5 is a partial cross-sectional view showing a stabilizer plate;
fig. 6 is an enlarged view of a portion a in fig. 5 showing a positional relationship of the assemblable plate on the stabilizer plate.
In the figure, 1, a first reinforcing wall; 11. placing a slope surface; 12. reinforcing holes; 2. a second reinforcing wall; 21. connecting holes; 3. compounding anchor rods; 31. reinforcing steel bars; 311. fixing the loop; 32. a grouting pipe; 321. grouting holes; 322. a guard ring pad; 4. a composition board; 41. a base plate; 411. a rib plate; 412. a butt joint plate; 42. reinforcing the pipe; 43. a top plate; 5. a stabilizing plate; 51. a transverse plate; 511. a placement groove; 512. a baffle plate; 5121. a limiting plate; 5122. a locking plate; 52. a connecting plate.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
The embodiment of the application discloses a deep foundation pit construction method with a side wall supporting function, which comprises the following steps:
s1, referring to the figure 1, cleaning a construction site to enable the upper surface of the construction site to be flat, marking the periphery of the construction site, and arranging piles along the marked positions by a three-shaft mixing pile machine to support, thereby forming a first reinforcing wall 1;
s2, referring to fig. 2, performing slope excavation from the top of the first reinforcing wall 1 to the inside of the space enclosed by the first reinforcing wall, thereby forming a slope surface 11, excavating the foundation pit to the plane of the bottom end of the slope surface 11, then forming reinforcing holes 12 in the slope surface 11 through drilling equipment, penetrating the first reinforcing wall 1 through the reinforcing holes 12, inserting the composite anchor rods 3 into the reinforcing holes 12, and performing grouting reinforcement on the reinforcing holes 12 through the composite anchor rods 3;
the length direction of the reinforcing holes 12 is perpendicular to the slope surface 11, and the reinforcing holes 12 are uniformly distributed at equal intervals along the horizontal direction.
Referring to fig. 2 and 3, the composite anchor rod 3 includes grouting pipes 32 and 5 reinforcing bars 31, a plurality of groups of grouting holes 321 are equidistantly opened along the length direction of the outer side walls of the grouting pipes 32, and 3 grouting holes 321 are uniformly distributed in the circumferential direction of the outer walls of the grouting pipes 32.
Combine fig. 3 and fig. 4, the even cover of slip casting pipe 32 lateral wall is equipped with guard ring pad 322 along its length direction, reinforcing bar 31 supports tightly with guard ring pad 322, and length direction is on a parallel with the length direction of slip casting pipe 32, reinforcing bar 31 uses slip casting pipe 32 the central axis evenly distributed as the center, the fixed cover of reinforcing bar 31 outer wall is equipped with a plurality of fixed ring cover 311, fixed ring cover 311 circumference inner wall and 5 reinforcing bar 31 butt, and push it tightly to slip casting pipe 32 with it, fixed ring cover 311 is along slip casting pipe 32 length direction equipartition.
After the composite anchor rod 3 is inserted into the reinforcing hole 12, the grouting pipe 32 is used for pouring building grout into the reinforcing hole 12, and the grout is uniformly filled into the reinforcing hole 12 through the grouting hole 321, so that the grouting and reinforcing efficiency of the reinforcing hole 12 is effectively improved; the reinforcing steel bars 31 effectively protect the grouting pipes 32 and improve the strength of the composite anchor rod 3; the protective ring pad 322 effectively protects the grouting pipe 32, so that the service life of the grouting pipe 32 is prolonged; the fixing ring sleeve 311 tightly supports and fixes the reinforcing steel bar 31 to the grouting pipe 32, so that the stability of the composite anchor rod 3 is improved, and the supporting and reinforcing effect on the deep foundation pit is further improved.
S3, referring to the figures 1 and 2, arranging piles at the edge position of the deep foundation pit at the bottom end of the slope 11 through a three-axis mixing pile machine to support, so as to form a second reinforcing wall 2, and performing cement reinforcement on both the slope 11 and the second reinforcing wall 2;
s4, moving the composite board 4, so that the part of the composite anchor rod 3, which is positioned outside the sloping surface 11, is tightly propped against the inner bottom wall of the reinforcing pipe 42 of the composite board 4, and meanwhile, fixing the composite board 4 on the cement reinforcing surface of the sloping surface 11;
referring to fig. 1 and 2, the composite board 4 includes a bottom board 41, a reinforcing pipe 42 and a top board 43, the bottom board 41 is abutted on the slope 11 and is fixedly connected with the slope 11 through a screw, the reinforcing pipe 42 is communicated with the middle position of the side wall of the top board 43 far away from the slope 11, one end of the reinforcing wall far away from the bottom board 41 is communicated with the middle position of the top board 43, the side wall of the top board 43 far away from the bottom board 41 is perpendicular to the length direction of the composite anchor rod 3, the side walls of the top board 43 and the bottom board 41 close to each other are parallel to each other, the reinforcing pipe 42 is in interference fit with the composite anchor rod 3, and rib plates 411 fixedly connected with the circumferential outer wall of the reinforcing wall are fixedly arranged at the positions above and below the reinforcing pipe 42 on the side wall of the bottom board 41 close to the top board 43.
The combination board 4 is moved, so that the inner wall of the reinforcing pipe 42 is tightly abutted to the composite anchor rod 3, the bottom board 41 is abutted to the cement reinforcing surface of the slope placing surface 11 and is fixed, the combination board 4 further fixes the composite anchor rod 3 and the slope placing surface 11, and the stability of the composite anchor rod 3 in fixing the slope placing surface 11 and the first reinforcing wall 1 is further improved; the rib plate 411 effectively improves the fixing stability of the reinforcing pipe 42, the side wall of the top plate 43 far away from the bottom plate 41 and the composite anchor rod 3 are obliquely arranged in the length direction, the fixing stability of the composite anchor rod 3 is effectively improved, the fixing effect of deep foundation pit support is further improved, and the safety of the deep foundation pit is improved.
S5, referring to fig. 5, continuing to excavate the foundation pit downward along the second reinforcing wall 2, uniformly forming a plurality of connecting holes 21 in the horizontal direction on the second reinforcing wall 2 by drilling equipment at each end distance, penetrating the second reinforcing wall 2 through the connecting holes 21, penetrating the first reinforcing wall 1, inserting the composite anchor rods 3 into the connecting holes 21, and grouting and reinforcing the connecting holes 21;
s6, moving the stabilizing plate 5 to fixedly connect the stabilizing plate 5 to the side wall of the second reinforcing wall 2 far away from the first reinforcing wall 1, wherein the part of the composite anchor rod 3 on the second reinforcing wall 2 extending out of the second reinforcing wall 2 is positioned in the middle hole of the adjacent stabilizing plate 5, and then fixing the composite plate 4 on the stabilizing plate 5, and the inner wall of the reinforcing pipe 42 of the stabilizing plate 5 is tightly fixed with the corresponding composite anchor rod 3;
referring to fig. 5 and 6, the stabilizing plate 5 includes two horizontal transverse plates 51 and a plurality of vertically arranged connecting plates 52, the transverse plates 51 are fixedly arranged on the side wall of the second reinforcing wall 2 far away from the first reinforcing wall 1 and fixedly connected with the second reinforcing wall 2 through bolts, the two transverse plates 51 are parallel to each other, the composite anchor rods 3 extending out of the second reinforcing wall 2 are located between the two adjacent transverse plates 51, the connecting plates 52 are fixedly arranged on the side wall of the two adjacent transverse plates 51 far away from the second reinforcing wall 2 and fixedly connect the two transverse plates 51, the connecting plates 52 are uniformly distributed along the length direction of the transverse plates 51 and located at the side wall protrusions of the second reinforcing wall 2, and the side walls of the transverse plates 51 close to the second reinforcing wall 2 are tightly attached to the second reinforcing wall 2.
The connection holes 21 are formed at the protrusions of the side wall of the second reinforcing wall 2 at positions between the two connection plates 52, and the connection holes 21 are inclined downward in a direction away from the deep foundation pit.
The lateral wall of the transverse plate 51 far away from the second reinforcing wall 2 and close to the composite anchor rod 3 is provided with a placing groove 511 for the bottom plate 41 to abut against at the same time, the bottom plate 41 is fixedly connected in the placing groove 511, the circumferential lateral wall abuts against the circumferential inner wall of the placing groove 511, and the lateral wall of the bottom plate 41 close to the top plate 43 is flush with the opening end surface of the placing groove 511.
The difference between the combined plate 4 located on the transverse plate 51 and the combined plate 4 located on the slope 11 lies in that the bottom of the side wall of the bottom plate 41 close to the top plate 43 is fixedly provided with the abutting plate 412, the positions of the two adjacent transverse plates 51 close to the bottom plate 41 are respectively fixedly provided with the vertically-arranged baffle plate 512, the baffle plate 512 is fixedly connected with the two transverse plates 51 at the same time, the baffle plate 512 is close to the side wall of the reinforcing pipe 42, and the position far away from the baffle plate 512 is fixedly provided with the vertically-arranged limiting plate 5121, the side wall of the limiting plate 5121 close to the transverse plate 51 is flush with the side wall of the top plate 43 close to the bottom plate 41, the limiting plate 5121, the locking plate 5122 is connected between the bottom plate 41 and the transverse plates 51 in a sliding manner, the bottom end of the locking plate 5122 is abutted to the upper surface of the abutting plate 412, the circumferential side wall of the locking plate 5122 is respectively abutted to the baffle plate 512, the limiting plate 5121, the bottom plate 41, the top plate 43 and the transverse plate 51 are abutted to be fixed through cement mortar.
In the process of downwards excavating the deep foundation pit, the second reinforcing wall 2 is perforated layer by layer, and the connecting holes 21 are reinforced by grouting through the composite anchor rods 3, so that the second reinforcing wall 2 and the first reinforcing wall 1 are mutually supported and fixed, the supporting and reinforcing effect of the side wall of the deep foundation pit is effectively improved, meanwhile, the transverse plate 51 effectively fixes the second reinforcing wall 2, the side wall of the transverse plate is tightly attached to the second reinforcing wall 2, the reinforcing and fixing effect of the second reinforcing wall 2 is effectively improved, and the fixing stability of the two transverse plates 51 is effectively improved by the connecting plate 52; the placing groove 511 effectively improves the effect of fixing the position of the bottom plate 41 of the combined plate 4 on the transverse plate 51, and simultaneously fixes the composite anchor rod 3 extending out of the second reinforcing wall 2 through the combined plate 4, so that the fixing effect of the composite anchor rod 3 is improved, and the fixing effect of the transverse plate 51 and the second reinforcing wall 2 is also improved; insert lockplate 5122 in corresponding position, lockplate 5122 is effectual carries out further fixed to compoboard 4 on the diaphragm 51, and the effectual probability that has reduced compoboard 4 and to keeping away from the upward removal of diaphragm 51, and the effectual position to lockplate 5122 of butt board 412 is fixed, has further improved the stability that compoboard 4 fixed on diaphragm 51, and then has improved the lateral wall to the deep basal pit and has strutted reinforced (rfd) effect, has improved the security of deep basal pit.
And S7, continuously excavating the foundation pit downwards to the depth specified by the engineering, binding a steel net at the bottom of the deep foundation pit, pouring building grout at the bottom of the deep foundation pit, and further reinforcing the bottom of the deep foundation pit.
And grouting reinforcement is carried out on the bottom of the deep foundation pit, so that construction and support of the deep foundation pit are completed, and the safety of the deep foundation pit is effectively improved.
The implementation principle of the deep foundation pit construction method with the side wall supporting function in the embodiment of the application is as follows: cleaning a construction site, flattening, arranging piles at the periphery of a construction area through a three-axis mixing pile machine to form a first reinforcing wall 1, excavating an inclined slope placing surface 11 towards the center along the first reinforcing wall 1, then excavating reinforcing holes 12 towards the slope placing surface 11, extending composite anchor rods 3 into the reinforcing holes 12, performing grouting reinforcement, arranging piles at the bottom end of the slope placing surface 11 through the three-axis mixing pile machine to form a second reinforcing wall 2, performing cement reinforcement on the slope placing surface 11, fixing a combined plate 4 on the slope placing surface 11, and fixing the composite anchor rods 3; and excavating the foundation pit downwards along the area surrounded by the second reinforcing wall 2, when digging a certain distance under the foundation pit, forming a continuous hole on the second reinforcing wall 2, inserting the composite anchor rod 3 into the continuous hole, pouring and reinforcing, further connecting and reinforcing the first protective wall and the second protective wall, moving the stabilizing plate and fixing the stabilizing plate on the second reinforcing wall 2, moving the other combined plates 4 and fixing the combined plates in the placing groove 511, fixing the composite anchor rod 3 extending out of the continuous hole, and moving the locking plate 5122 so that the locking plate 5122 is simultaneously positioned in a space between the limiting plate 5121, the bottom plate 41 and the transverse plate 51, thereby effectively improving the effect of supporting and fixing the side wall of the deep foundation pit, continuing to dig the deep foundation pit to a specified depth, reinforcing the bottom of the deep foundation pit, completing the construction of the deep foundation pit and effectively improving the safety of the deep foundation pit.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A deep foundation pit construction method with a side wall supporting function is characterized in that: the method comprises the following steps:
s1, clearing a construction site, and arranging piles at the periphery of the deep foundation pit area through a triaxial mixing pile machine to support to form a first reinforced wall (1);
s2, carrying out slope releasing excavation from the top of the first reinforcing wall (1) to the inside of the space enclosed by the first reinforcing wall to form a slope releasing surface (11), digging a foundation pit to the bottom end position of the slope releasing surface (11), drilling a hole on the slope releasing surface (11) through drilling equipment, penetrating the first reinforcing wall (1) to form a reinforcing hole (12), inserting a composite anchor rod (3) into the reinforcing hole (12), and carrying out grouting reinforcement;
s3, performing pile arrangement supporting on the edge of the deep foundation pit area at the bottom end of the slope placing surface (11) through a three-shaft mixing pile machine to form a second reinforcing wall (2), and performing cement reinforcing on the slope placing surface (11) to enable the cement reinforcing surface to cover the second reinforcing wall (2);
s4, moving the composite board (4), enabling the composite anchor rod (3) to be tightly abutted against the inner wall of the reinforcing pipe (42) of the composite board (4), and fixedly paving the composite board (4) on a cement surface on the slope placing surface (11);
s5, continuously excavating a foundation pit downwards along the space surrounded by the second reinforcing wall (2), forming a connecting hole (21) penetrating through the first reinforcing wall (1) on the second reinforcing wall (2) through drilling equipment, inserting the composite anchor rod (3) into the connecting hole (21), and grouting and reinforcing the connecting hole (21);
s6, moving the stabilizing plate (5), enabling the composite anchor rods (3) on the second reinforcing wall (2) to be located in the middle holes of the stabilizing plate (5), fixedly connecting the stabilizing plate (5) to the second reinforcing wall (2), moving the combination plate (4), enabling the composite anchor rods (3) on the second reinforcing wall (2) to be tightly abutted against the inner wall of the reinforcing pipes (42) of the combination plate (4), and fixing the combination plate (4) on the stabilizing plate (5);
and S7, continuously excavating the foundation pit downwards to a proper depth, and reinforcing the bottom of the foundation pit.
2. The method for constructing a deep foundation pit with a side wall supporting function according to claim 1, wherein: compound stock (3) are including slip casting pipe (32) and a plurality of reinforcing bar (31), and reinforcing bar (31) fixed connection is in slip casting pipe (32) circumference outer wall, and a plurality of injected holes (321) have been seted up in slip casting pipe (32).
3. The method for constructing a deep foundation pit with a side wall supporting function according to claim 2, wherein: the side wall of the steel bar (31) far away from the grouting pipe (32) is abutted with a plurality of fixing ring sleeves (311), and the circumferential inner wall of each fixing ring sleeve (311) tightly pushes the steel bar (31) towards the grouting pipe (32).
4. The method for constructing a deep foundation pit with a side wall supporting function according to claim 3, wherein: the fixed cover of slip casting pipe (32) outer wall is equipped with a plurality of protection ring pads (322), and steel bar (31) will protect ring pad (322) to slip casting pipe (32) top tightly.
5. The method for constructing a deep foundation pit with a side wall supporting function according to claim 1, wherein: the combined plate (4) comprises a bottom plate (41), a reinforcing pipe (42) and a top plate (43), the reinforcing wall is communicated with the bottom plate (41), one end, far away from the bottom plate (41), of the reinforcing pipe (42) is communicated with the top plate (43), and the inner wall of the reinforcing pipe (42) is in interference fit with the circumferential side wall of the composite anchor rod (3).
6. The method for constructing a deep foundation pit with a side wall supporting function according to claim 5, wherein: and rib plates (411) fixedly connected with the outer side wall of the reinforcing pipe (42) are fixedly arranged at the top and the bottom of the side wall of the bottom plate (41) close to the top plate (43).
7. The method for constructing a deep foundation pit with a side wall supporting function according to claim 5, wherein: the reinforcing wall is characterized in that the reinforcing plate (5) comprises two transverse plates (51) and a plurality of connecting plates (52), the two transverse plates (51) are arranged in parallel, the transverse plates (51) are fixedly connected to the side wall, far away from the first reinforcing wall (1), of the second reinforcing wall (2), the connecting plates (52) and the two transverse plates (51) are fixedly connected to the side wall, far away from the second reinforcing wall (2), and the space between the two transverse plates (51) is used for the composite anchor rod (3) of the second reinforcing wall (2) to penetrate.
8. The method for constructing a deep foundation pit with a side wall supporting function according to claim 7, wherein: and a placing groove (511) for placing the bottom plate (41) is formed in the position, close to the composite anchor rod (3), on the side wall, far away from the second reinforcing wall (2), of the transverse plate (51).
9. The method for constructing a deep foundation pit with a side wall supporting function according to claim 8, wherein: the relative lateral wall of bottom plate (41) and roof (43) is parallel to each other, the equal fixedly connected with baffle (512) in position that two diaphragm (51) are close to standing groove (511), the lateral wall that baffle (512) are close to standing groove (511), the position of keeping away from diaphragm (51) has set firmly limiting plate (5121), the lateral wall that limiting plate (5121) are close to diaphragm (51) is close to bottom plate (41) with roof (43) the lateral wall coplane, bottom plate (41) bottom has set firmly butt joint board (412), limiting plate (5121), it is connected with lockplate (5122) to slide in the space that encloses between roof (43) and diaphragm (51), lockplate (5122) bottom and butt joint board (412) butt.
10. The method for constructing a deep foundation pit with a side wall supporting function according to claim 7, wherein: the transverse plate (51) is close to the side wall of the second reinforcing wall (2) and is tightly attached to the second reinforcing wall (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110149489.9A CN112942368B (en) | 2021-02-03 | 2021-02-03 | Deep foundation pit construction method with side wall supporting function |
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