A batter pile support structure and a construction method thereof

Abstract

The application relates to a bracing structure of a batter pile and a construction method thereof, and belongs to the technical field of foundation pit support. The bracing structure comprises a foundation pit and a row of piles vertically inserted into the soil body at the edge of the foundation pit. The top of the row of piles is provided with a corbel, the corbel is provided with prefabricated batter piles, the prefabricated batter piles comprise lattice columns and hollow square piles which are coaxial and connected in a head-to-tail mode, the top of the lattice column is inserted into the corbel, the hollow square pile is obliquely inserted into the soil body below the inner side of the foundation pit, the soil solidification part is arranged around the part of the hollow square pile inserted into the soil body, the bottom end of the hollow square pile is provided with a solidification head, the soil solidification part and the solidification head are integrally formed by grouting, and the cross-section circumference of the solidification head is larger than that of the soil solidification part. The application has the effect of reducing the possibility of displacement and deformation of the soil body on the side of the foundation pit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of foundation pit support, in particular to a diagonal bracing pile support structure and a construction method thereof. BACKGROUND

[0002] The existing foundation pit support forms (ways) mainly include slope, gravity retaining wall, soil nailing wall, row pile, underground continuous wall, reverse arch wall, etc., which are sometimes used alone or in combination. Due to different geological conditions, the support forms used are also different.

[0003] Under the existing row pile support form, due to the complex surrounding environment of the foundation pit, there are important protected objects on the ground and underground, the existing row pile cantilever (anti-slide pile) design cannot meet the safety requirements of the foundation pit due to the lack of horizontal support, and the displacement and deformation of the foundation pit soil are prone to occur during the excavation and construction of the foundation pit. SUMMARY

[0004] In order to reduce the possibility of displacement and deformation of the foundation pit soil, the present application provides a diagonal bracing pile support structure and a construction method thereof.

[0005] In the first aspect, the present application provides a diagonal bracing pile support structure, which adopts the following technical solution:

[0006] A diagonal bracing pile support structure, comprising a foundation pit and a row pile vertically inserted into the soil body at the edge of the foundation pit, the top of the row pile is provided with a crown beam, the crown beam is provided with a prefabricated diagonal pile, the prefabricated diagonal pile comprises a lattice column and a hollow square pile which are coaxial and connected end to end, the top of the lattice column is inserted into the crown beam, the hollow square pile is inserted into the soil body below the inner side of the foundation pit, a soil solidification part is provided around the part of the hollow square pile inserted into the soil body, a solidification head is provided at the bottom end of the hollow square pile, the soil solidification part and the solidification head are integrally formed by grouting, and the cross-sectional circumference of the solidification head is larger than that of the soil solidification part.

[0007] By adopting the above technical solution, the support of the row pile along the horizontal direction can be enhanced by the setting of the prefabricated diagonal pile, thereby reducing the possibility of displacement and deformation of the soil body on the side of the foundation pit. By setting the soil solidification part, the foundation strength of the soil around the hollow square pile is improved, and at the same time, the soil solidification part is solidified and formed on the outside of the hollow square pile, which can expand the contact area with the soil body below the foundation pit and improve the side friction resistance of the hollow square pile, so as to adapt to a wider foundation soil body, so that the hollow square pile has higher bearing capacity in soft soil body and reduces the possibility of deviation and inclination of the hollow square pile in the soil body.

[0008] Optionally, the top of the lattice column is provided with an upper end plate, a jet grouting power head is detachably connected to the upper end plate, an output end of the jet grouting power head is provided with a jet grouting drill rod, and a bottom end of the hollow square pile is provided with a lower end plate, and the upper end plate and the lower end plate are provided with drill rod holes through which the jet grouting drill rod passes.

[0009] By adopting the above technical scheme, when the prefabricated inclined pile is inserted into the soil body, the jet grouting power head is started, the jet grouting power head sprays cement slurry through the jet grouting drill rod, so as to facilitate the pouring of the soil solidification part and the solidification head, and after the jet grouting is completed, the jet grouting power head can be detached and recycled for the construction of the next prefabricated inclined pile, thereby reducing the number of jet grouting power heads and jet grouting drill rods, and achieving the purpose of cost reduction.

[0010] Optionally, the lattice column comprises four outer angle steels, the four angle steels form four corner ends of a square frame, adjacent two angle steels are connected with a patch plate, and the patch plate is uniformly provided with a plurality of patch plates from top to bottom along the inclined direction of the lattice column.

[0011] By adopting the above technical scheme, the connection strength of adjacent angle steels is enhanced through the arrangement of the patch plate, so that the lattice column ensures the structural strength while controlling the cost of materials, and since the lattice column is a steel frame structure, the top of the lattice column and the reinforcement inside the corbel are conveniently bound and fixed, the possibility of deviation or shaking of the lattice column during pouring of the corbel is reduced, and the pouring and forming of the corbel are facilitated.

[0012] Optionally, the foundation pit is provided with a building structure, the building structure is a reinforced concrete structure, the row pile is arranged outside the building structure, the building structure comprises a bottom plate and a side plate arranged on the bottom plate, the bottom plate is fixed to the bottom wall of the foundation pit, a water stop piece is fixed to the reinforcement in the bottom plate, and the prefabricated inclined pile passes through the water stop piece.

[0013] By adopting the above technical scheme, the possibility of groundwater seeping into the basement space of the building structure through the gap between the prefabricated inclined pile and the bottom plate is reduced through the arrangement of the water stop piece, and the water seepage resistance of the bottom plate is enhanced.

[0014] In a second aspect, the application also provides a diagonal bracing pile supporting structure, which adopts the following technical scheme:

[0015] A construction method of a diagonal bracing pile supporting structure, comprising the following steps:

[0016] Manufacturing a prefabricated inclined pile: four angle steels are welded and connected into a square lattice column by using patch plates, the lattice column is welded on a customized hollow square pile, an upper end plate is welded on one end of the prefabricated inclined pile, a lower end plate is welded on the other end, and drill rod holes are reserved on the upper end plate and the lower end plate;

[0017] Installing the jet grouting power head and the jet grouting drill pipe: installing the jet grouting power head on the upper end plate and inserting the jet grouting drill pipe into the precast inclined pile through the reserved hole, the upper part of the jet grouting drill pipe being connected with the jet grouting power head and the lower part of the jet grouting drill pipe being inserted out of the lower end plate;

[0018] Excavating a temporary pit: determining the inclination angle of the precast inclined pile during implantation, and excavating a temporary pit with the same inclination angle as that during implantation at the implantation position of the precast inclined pile;

[0019] Hoisting the precast inclined pile: hoisting the precast inclined pile to the temporary pit;

[0020] Preparing for grouting: connecting the input end of the jet grouting power head with the slurry supply system;

[0021] Pile feeding: feeding the precast inclined pile into the soil along the temporary pit by using a pile feeding device;

[0022] Rotary jet grouting: after the precast inclined pile reaches the design elevation or the specified soil layer, starting the slurry supply system, repeatedly jetting the cement slurry or the soil solidifying agent into the bottom of the precast inclined pile at high pressure until the required amount of soil solidification part is reached.

[0023] By adopting the above technical solution, the soil solidification part is arranged to improve the foundation strength of the soil around the hollow square pile. Meanwhile, the soil solidification part is solidified and formed on the outside of the hollow square pile, which can expand the contact area with the soil under the foundation pit and improve the side friction of the hollow square pile. Therefore, the hollow square pile can adapt to a wider range of foundation soil, and has higher bearing capacity in soft soil, reducing the possibility of deviation and inclination of the hollow square pile in the soil.

[0024] Optionally, during the pile feeding step, the slurry supply system is started to pre-mix the slurry to facilitate the implantation of the precast inclined pile.

[0025] By adopting the above technical solution, the efficiency of implanting the precast inclined pile can be improved, thereby improving the overall construction efficiency. In addition, the wear and tear of the precast inclined pile and the jet grouting drill pipe during implantation in the soil can be reduced, thereby prolonging the service life of the jet grouting drill pipe.

[0026] Optionally, during the rotary jet grouting, the jet grouting at the bottom end of the precast inclined pile is expanded to facilitate the formation of a solidification head after solidification.

[0027] By adopting the above technical solution, the pile end of the precast inclined pile is expanded by the solidification head, thereby improving the pile end bearing capacity of the precast inclined pile and improving its anti-pulling and anti-displacement ability.

[0028] Optionally, after completing the rotary jet grouting step, the jet grouting power head and the jet grouting drill pipe are removed, and after recovery, they are used for the construction of the next precast inclined pile or are cleaned in time to prevent the cement slurry from being blocked.

[0029] By adopting the technical scheme, the shotcrete power head and the shotcrete drill rod can be recycled, thereby reducing construction cost.

[0030] Optionally, after the soil solidification part and the solidification head are solidified and formed, the crown beam is poured on the pile row, and the prefabricated inclined pile is fixed with the pile row after the crown beam is solidified and formed.

[0031] By adopting the technical scheme, the pile row and the prefabricated inclined pile are connected together by the crown beam to form a stable triangular support structure together with the soil under the foundation pit, thereby reducing the possibility of displacement and deformation of the side of the foundation pit.

[0032] Optionally, after the crown beam is solidified and formed, the construction of the building structure is performed, the upper and lower ends of the prefabricated inclined pile are cut off along the inner and outer sides of the side plate, the prefabricated inclined pile is cut off along the upper surface edge of the bottom plate, and the connection between the crown beam and the prefabricated inclined pile is cut and removed.

[0033] By adopting the technical scheme, the prefabricated inclined pile inserted into the building structure is cut off after the main body of the building structure is completed, thereby facilitating subsequent construction and decoration of the building structure.

[0034] In summary, the present application has at least one of the following beneficial technical effects:

[0035] 1. The prefabricated inclined pile can enhance the support of the pile row in the horizontal direction, thereby reducing the possibility of displacement and deformation of the soil on the side of the foundation pit.

[0036] 2. The soil solidification part improves the foundation strength of the soil around the hollow square pile, and the soil solidification part is solidified and formed on the outer side of the hollow square pile, thereby expanding the contact area with the soil under the foundation pit, improving the side friction of the hollow square pile, and making the hollow square pile have higher bearing capacity in soft soil, thereby reducing the possibility of deviation and inclination of the hollow square pile in the soil.

[0037] 3. The supply of slurry is sprayed and pre-mixed during the pile feeding step, which can improve the efficiency of the prefabricated inclined pile implantation, thereby improving the overall construction efficiency. In addition, the wear of the prefabricated inclined pile and the shotcrete drill rod during implantation in the soil can be reduced, thereby prolonging the service life of the shotcrete drill rod. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a schematic diagram of the overall structure of the inclined strut pile support structure.

[0039] Figure 2is a sectional view of a soil solidifying part and a solidifying head embodying the embodiments of the present application.

[0040] Figure 3 is a structural schematic view of a prefabricated inclined pile embodying the embodiments of the present application.

[0041] Figure 4 is a structural schematic view of a pile feeding device embodying the embodiments of the present application.

[0042] Figure 5 is a structural schematic view of a connection relationship between an adjusting frame and a hydraulic rod embodying the embodiments of the present application.

[0043] Figure 6 is a structural schematic view of an iron chain and a hook embodying the embodiments of the present application.

[0044] BRIEF DESCRIPTION OF DRAWINGS 1, foundation pit; 2, row pile; 21, crown beam; 3, prefabricated inclined pile; 31, lattice column; 311, angle steel; 312, patch plate; 32, hollow square pile; 321, soil solidifying part; 322, solidifying head; 33, upper end plate; 331, shotcrete power head; 332, shotcrete drill rod; 34, lower end plate; 35, drill rod hole; 4, building structure; 41, bottom plate; 411, water stop piece; 42, side plate; 5, pile feeding device; 51, mounting frame; 511, mounting plate; 5111, hydraulic push rod; 52, hydraulic rod; 521, connecting plate; 522, adjusting frame; 53, hoop plate; 54, limiting rod; 541, limiting end; 542, iron chain; 5421, hook; 55, limiting interval. DETAILED DESCRIPTION

[0045] The following will be described in detail below with reference to the accompanying drawings Figures 1-6 The present application will be further described in detail.

[0046] In a first aspect, the embodiments of the present application disclose a diagonal bracing pile supporting structure.

[0047] Referring to Figure 1 and FIG. 2, a diagonal bracing pile supporting structure includes a foundation pit 1 and a row pile 2 vertically inserted into the soil body below the edge of the foundation pit 1, and a crown beam 21 is cast on the top of the row pile 2, and a prefabricated inclined pile 3 is arranged on the crown beam 21. The prefabricated inclined pile 3 includes a lattice column 31 and a hollow square pile 32 coaxially connected in sequence, the top of the lattice column 31 is inserted and fixed into the crown beam 21, and the hollow square pile 32 is obliquely inserted into the soil body below the inside of the foundation pit 1. Through the arrangement of the prefabricated inclined pile 3, the support of the row pile 2 along the horizontal direction can be enhanced, thereby reducing the possibility of displacement and deformation of the soil body on the side of the foundation pit 1.

[0048] Referring to Figure 2The soil solidification part 321 is arranged around the hollow square pile 32 inserted into the soil body part, the bottom end of the hollow square pile 32 is provided with a solidification head 322, the soil solidification part 321 and the solidification head 322 are integrally formed by grouting, and the transverse section circumference of the solidification head 322 is greater than that of the soil solidification part 321. Through the arrangement of the soil solidification part 321, the foundation strength of the soil around the hollow square pile 32 is improved, at the same time, the soil solidification part 321 is solidified and formed outside the hollow square pile 32, which can expand the contact area with the soil body below the foundation pit 1, improve the side friction of the hollow square pile 32, and thus can adapt to a wider foundation soil body, so that the hollow square pile 32 has higher bearing capacity in the soft soil body, and the possibility of deviation and inclination of the hollow square pile 32 in the soil body is reduced. Through the arrangement of the solidification head 322, the pile end bearing capacity of the prefabricated inclined pile 3 can be improved, and the anti-pulling and anti-displacement ability can be improved.

[0049] With reference to Figure 3 The top of the lattice column 31 is welded with an upper end plate 33, the upper end plate 33 is provided with a grouting power head 331, the grouting power head 331 is fixed on the upper end plate 33 by bolts, the output end of the grouting power head 331 is connected with a grouting drill rod 332, the bottom end of the hollow square pile 32 is welded with a lower end plate 34, the upper end plate 33 and the lower end plate 34 are provided with drill rod holes 35 for the grouting drill rod 332 to pass through. When the prefabricated inclined pile 3 is inserted into the soil body, the grouting power head 331 is started, the grouting power head 331 sprays cement slurry through the grouting drill rod 332, so as to facilitate the pouring of the soil solidification part 321 and the solidification head 322, and after the grouting is completed, the grouting power head 331 can be removed and recycled for the construction of the next prefabricated inclined pile 3, so as to reduce the number of grouting power heads 331 and grouting drill rods, and achieve the purpose of reducing cost.

[0050] With reference to Figure 3 The lattice column 31 includes four outer peripheral angle steels 311, the four angle steels 311 form four corner ends of a square frame, the top of the angle steel 311 is welded with the upper end plate 33, the bottom is welded with the top end of the hollow square pile 32, and the adjacent two angle steels 311 are welded with a patch plate 312, and the patch plate 312 is uniformly provided with a plurality of patch plates from top to bottom along the inclination direction of the lattice column 31. Through the arrangement of the patch plate 312, the connection strength of the adjacent angle steels 311 is enhanced, so that the lattice column 31 ensures the structural strength while controlling the cost of materials, and at the same time, since the lattice column 31 is a steel frame structure, the top of the lattice column 31 is convenient to bind and fix with the steel bars inside the crown beam 21, so as to reduce the possibility of deviation or shaking of the lattice column 31 in the pouring process of the crown beam 21, thereby facilitating the pouring and forming of the crown beam 21.

[0051] With reference to Figure 1And figure 2, the building structure 4 is arranged in the foundation pit 1, the building structure 4 is reinforced concrete structure, and the row pile 2 is surrounded at the outside of the building structure 4, the building structure 4 includes the bottom plate 41 and the side plate 42 fixed on the bottom plate 41, the bottom plate 41 is fixed on the bottom wall of the foundation pit 1, and the steel on the inside of the bottom plate 41 is welded with the water stop piece 411, and the prefabricated inclined pile 3 passes through the water stop piece 411 and is fixed by welding.The setting of the water stop piece 411 reduces the possibility of groundwater seepage into the basement space of the building structure 4 through the gap between the prefabricated inclined pile 3 and the bottom plate 41, and enhances the water seepage prevention performance of the bottom plate 41.

[0052] The implementation principle of the embodiment of the application is that: by adding the prefabricated inclined pile 3 on the inside of the row pile 2, the support of the row pile 2 along the horizontal direction can be enhanced, so that the possibility of displacement and deformation of the soil body on the side of the foundation pit 1 is reduced.

[0053] Through the setting of the soil solidification part 321, the foundation strength of the soil around the hollow square pile 32 is improved, and the soil solidification part 321 is solidified and formed on the outside of the hollow square pile 32, which can expand the contact area with the soil body below the foundation pit 1 and improve the side friction resistance of the hollow square pile 32, so that the hollow square pile 32 can adapt to a wider foundation soil body, so that the hollow square pile 32 has higher bearing capacity in soft soil body, and the possibility of deviation and inclination of the hollow square pile 32 in the soil body is reduced.Through the setting of the solidification head 322, the pile end bearing capacity of the prefabricated inclined pile 3 can be improved, and the anti-pulling and anti-displacement ability is improved.

[0054] In a second aspect, the embodiment of the application also discloses a construction method of the inclined bracing pile supporting structure.

[0055] Referring to Figure 3 And figure 4, a construction method of the inclined bracing pile supporting structure, comprising the following steps:

[0056] Construction preparation: understand the engineering appearance, environmental conditions and power supply position of the site.Determine the site component stacking position and construction machinery access line, refer to the construction plan layout, clean the construction road and travel route;Prepare the support pile processing plan and installation plan, make relevant technical preparation before construction, and make technical disclosure to the site construction personnel.

[0057] Making the prefabricated inclined pile 3: four angle steels 311 are connected into a square lattice column 31 by using the patch plate 312, and then the lattice column 31 is welded on the customized hollow square pile 32, the upper end plate 33 is welded on one end of the prefabricated inclined pile 3, and the lower end plate 34 is welded on the other end, and the drill rod hole 35 is reserved on the upper end plate 33 and the lower end plate 34. In this embodiment, the lattice column 31 is 9m long with a specification of 400mm*400mm, and the hollow square pile 32 is 9m long with a specification of 400mm*400mm; the type of the angle steel 311 is L100*2, the size of the patch plate 312 is 360mm*200mm*12mm, and the distance between the patch plates 312 is 500mm.

[0058] Installing the jet grouting power head 331 and the jet grouting drill rod 332: the jet grouting power head 331 is installed on the upper end plate 33, and the jet grouting drill rod 332 is inserted into the prefabricated inclined pile 3 through the reserved hole, the upper part of the jet grouting drill rod 332 is connected with the jet grouting power head 331, and the lower part of the jet grouting drill rod 332 passes through the lower end plate 34. The jet grouting power head 331 is connected with the slurry supply system, and whether the jet grouting power head 331 can work normally is tested.

[0059] Excavating the temporary pit: the inclination angle when the prefabricated inclined pile 3 is planted is determined, and the temporary pit with the same inclination angle as the inclination angle when the prefabricated inclined pile 3 is planted is excavated at the position where the prefabricated inclined pile 3 is to be planted.

[0060] Hoisting the prefabricated inclined pile 3: the prefabricated inclined pile 3 is hoisted to the temporary pit along the designated route by using the crane; during the hoisting process, slow driving and gentle handling are paid attention to, so as to prevent safety accidents.

[0061] Preparing for grouting: in the slurry supply system, the cement slurry is mixed according to the appropriate mixing ratio, and the input end of the jet grouting power head 331 is connected with the slurry supply system.

[0062] Piling: the prefabricated inclined pile 3 is sent into the soil along the temporary pit by using the piling device 5.

[0063] Referring to Figure 4 , the piling device 5 comprises a mounting frame 51, and a hydraulic rod 52 is symmetrically arranged on the side wall of the mounting frame 51, a hoop plate 53 is hinged to the telescopic end of the hydraulic rod 52, one end of the hydraulic rod 52 away from the telescopic end is hinged to the mounting frame 51, the same limiting rod 54 is arranged on the two hoop plates 53, the limiting rod 54 is provided with two limiting ends 541, and the limiting rod 54 is slidably connected with the hoop plate 53, so as to reduce the possibility of disengagement of the limiting rod 54 and the hoop plate 53. The two hoop plates 53 and the two limiting rods 54 surround to form a limiting interval 55, and the prefabricated inclined pile 3 is clamped in the limiting interval 55. The prefabricated inclined pile 3 is clamped and limited by the limiting interval 55, so as to reduce the possibility of loosening or deviation of the prefabricated inclined pile 3 during the piling process, thereby ensuring the accuracy of the inclination angle when the prefabricated inclined pile 3 is planted.

[0064] With reference to Figure 5 , the outer rod side wall of the hydraulic rod 52 is fixed with a connecting plate 521, and the two connecting plates 521 are pin-connected with the same adjusting frame 522. The mounting frame 51 is fixed with a mounting plate 511, the mounting plate 511 is mounted with a hydraulic push rod 5111, and the telescopic end of the hydraulic push rod 5111 is hinged with the bottom end of the adjusting frame 522. During the process of planting the prefabricated inclined pile 3 into the soil body, the hydraulic rod 52 needs to be adjusted to the corresponding inclination angle. The adjusting frame 522 is driven to move by the hydraulic push rod 5111, and the adjusting frame 522 drives the hydraulic rod 52 to deflect, so as to realize the adjustment of the inclination angle of the hydraulic rod 52.

[0065] With reference to Figure 6 , the limiting rod 54 is connected with an iron chain 542, and the end of the iron chain 542 away from the limiting rod 54 is fixed with a hook 5421. When the iron chain 542 is in a taut state, the hook 5421 is hung on one of the lacing plates 312. When the hydraulic rod 52 is elongated, the iron chain 542 is gradually tightened, and the prefabricated inclined pile 3 is pressed into the temporary pit. After the telescopic end of the hydraulic rod 52 reaches the maximum extension length, the pressure of the hydraulic equipment connected with the hydraulic rod 52 is adjusted to reduce the pressure, so that the hydraulic rod 52 is retracted, the clamp plate 53 slides back, and after the iron chain 542 returns to a relaxed state, the hook 5421 on the upper part of the iron chain 542 is removed and hung on the lacing plate 312 at the far end of the lattice column 31. The above pile feeding process is repeated until the prefabricated inclined pile 3 is pressed into the design elevation or the specified soil layer.

[0066] With reference to FIGS. 2 and 3, during the pile feeding process, the slurry supply system is started to first spray slurry for pre-mixing to facilitate the planting of the prefabricated inclined pile 3, which can improve the planting efficiency of the prefabricated inclined pile 3 and thus improve the overall construction efficiency. In addition, it can also reduce the wear and tear of the prefabricated inclined pile 3 and the jet grouting drill rod 332 during the planting process, thereby prolonging the service life of the jet grouting drill rod 332.

[0067] Rotary jet grouting: after the prefabricated inclined pile 3 reaches the design elevation or the specified soil layer, the slurry supply system is started to repeatedly inject high-pressure cement slurry or soil solidifying agent into the bottom thereof until the required amount of soil solidification part 321 is reached. During this process, the bottom end of the prefabricated inclined pile 3 is jet grouted to be enlarged to facilitate the formation of a solidified head 322 after solidification, thereby improving the pile end bearing capacity of the prefabricated inclined pile 3 and improving its uplift and displacement resistance.

[0068] Drill rod recovery: after the rotary jet grouting is completed, the jet grouting power head 331 and the jet grouting drill rod 332 are removed and recovered for use in the construction of the next prefabricated inclined pile 3. If the next prefabricated inclined pile 3 is not constructed in time, the jet grouting power head 331 and the jet grouting drill rod 332 need to be cleaned in time to prevent the cement slurry therein from clogging and causing the jet grouting drill rod 332 to be scrapped.

[0069] Crown beam 21 pouring: after the soil solidification part 321 and the solidification head 322 are solidified and formed, the pouring construction of the crown beam 21 is performed on the row pile 2, and the crown beam 21 is solidified and formed to fix the prefabricated inclined pile 3 and the row pile 2. The row pile 2 and the prefabricated inclined pile 3 are connected together by the crown beam 21, and together with the soil under the foundation pit 1, a stable triangular support structure is formed, which can reduce the possibility of displacement, deformation and collapse of the side of the foundation pit 1.

[0070] Post-processing: after the crown beam 21 is solidified and formed, the construction of the building structure 4 is performed, and after the construction of the building structure 4 is completed, maintained, reaches the concrete strength and backfilled and compacted, the upper and lower ends of the prefabricated inclined pile 3 are cut off along the inner and outer sides of the side plate 42, and the prefabricated inclined pile 3 is cut off along the upper surface edge of the bottom plate 41, and the connection between the crown beam 21 and the prefabricated inclined pile 3 is cut and removed. When the main body of the building structure 4 is completed, the prefabricated inclined pile 3 inserted into the building structure 4 is cut off, which can facilitate the subsequent construction and decoration of the building structure 4. At the same time, after the prefabricated inclined pile 3 is cut off, the appearance of the building structure 4 can be improved, the occupied space of the prefabricated inclined pile 3 can be reduced, and the cut-off part of the prefabricated inclined pile 3 is treated as construction waste for waste treatment.

[0071] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A construction method for a inclined-pile support structure, characterized in that, The structure includes a sloping pile support structure, which comprises a foundation pit (1) and a row of piles (2) vertically inserted into the soil at the edge of the foundation pit (1). The top of the row of piles (2) is provided with a capping beam (21), and the capping beam (21) is provided with precast sloping piles (3). The precast sloping piles (3) include a lattice column (31) connected end to end on the same axis and a hollow square pile (32). The top of the lattice column (31) is inserted into the capping beam (21). The hollow square pile (32) is obliquely inserted into the soil below the inner side of the foundation pit (1). The hollow square pile (32) is provided with soil solidification part (321) around the part inserted into the soil. The bottom end of the hollow square pile (32) is provided with solidification head (322). The soil solidification part (321) and the solidification head (322) are integrally grouted and formed. The cross-sectional perimeter of the solidification head (322) is greater than the cross-sectional perimeter of the soil solidification part (321). The top of the lattice column (31) is provided with an upper end plate (33), and a shotcrete power head (331) is detachably connected to the upper end plate (33). The output end of the shotcrete power head (331) is provided with a shotcrete drill rod (332). The bottom end of the hollow square pile (32) is provided with a lower end plate (34). The upper end plate (33) and the lower end plate (34) are provided with drill rod holes (35) for the shotcrete drill rod (332) to pass through. The lattice column (31) includes four angle steels (311) surrounding the outside. The four angle steels (311) form the four corners of a square frame. Adjacent angle steels (311) are connected with gusset plates (312). Multiple gusset plates (312) are evenly arranged from top to bottom along the inclined direction of the lattice column (31). The pile driving device (5) includes a mounting frame (51). Hydraulic rods (52) are symmetrically arranged on the side wall of the mounting frame (51). The telescopic end of the hydraulic rod (52) is hinged to a clamp plate (53). The end of the hydraulic rod (52) away from its telescopic end is hinged to the mounting frame (51). The same limiting rod (54) is passed through the two clamp plates (53). There are two limiting rods (54), and the limiting rods (54) are slidably connected to the clamp plates (53). The two ends of the limiting rods (54) are fixed with limiting ends (541). The two clamp plates (53) and the two limiting rods (54) enclose a limiting area (55). The precast inclined pile (3) is clamped in the limiting area. Within the interval (55); a connecting plate (521) is fixed on the outer side wall of the hydraulic rod (52), and the two connecting plates (521) are connected to the same adjusting frame (522) by pins. An mounting plate (511) is fixed on the mounting frame (51), and a hydraulic push rod (5111) is mounted on the mounting plate (511). The telescopic end of the hydraulic push rod (5111) is hinged to the bottom end of the adjusting frame (522). A chain (542) is connected to the limiting rod (54), and a hook (5421) is fixed at the end of the chain (542) away from the limiting rod (54). When the chain (542) is taut, the hook (5421) is hung on one of the lacing plates (312). Includes the following steps: Fabrication of precast inclined piles (3): Four angle steels (311) are welded together with gusset plates (312) to form a square lattice column (31). The lattice column (31) is then welded onto a custom-made hollow square pile (32). An upper end plate (33) is welded to one end of the precast inclined pile (3), and a lower end plate (34) is welded to the other end. Drill holes (35) are reserved on the upper end plate (33) and the lower end plate (34). Install the shotcrete power head (331) and shotcrete drill rod (332): Install the shotcrete power head (331) on the upper end plate (33) and insert the shotcrete drill rod (332) into the precast inclined pile (3) through the reserved hole. The upper part of the shotcrete drill rod (332) is connected to the shotcrete power head (331), and the lower part passes through the lower end plate (34). Excavate a temporary pit: Determine the inclination angle when the precast inclined pile (3) is implanted, and excavate a temporary pit at the location where the precast inclined pile (3) is to be implanted with an inclination angle consistent with that when it is implanted; Hoisting the precast inclined pile (3): Hoist the precast inclined pile (3) to the temporary pit; Grouting preparation: Connect the input end of the shotcrete power head (331) to the grout supply system; Piling: Using the piling device (5), the precast inclined pile (3) is driven into the soil along the temporary pit; Jet grouting: When the precast inclined pile (3) reaches the design elevation or the specified soil layer, start the grouting system and repeatedly spray cement grout or soil stabilizer into its bottom under high pressure until the required amount of soil stabilizer (321) is reached.

2. The construction method of the inclined bracing pile support structure according to claim 1, characterized in that: The foundation pit (1) is provided with a building structure (4), which is a reinforced concrete structure. The piles (2) are located on the outside of the building structure (4). The building structure (4) includes a base plate (41) and side plates (42) on the base plate (41). The base plate (41) is fixed to the bottom wall of the foundation pit (1). Waterstop plates (411) are fixed on the steel bars in the base plate (41). The precast inclined piles (3) pass through the waterstop plates (411).

3. The construction method of the inclined bracing pile support structure according to claim 2, characterized in that: During the pile driving process, the grouting system is started to spray grout for pre-mixing to facilitate the implantation of the precast inclined pile (3).

4. The construction method of the inclined bracing pile support structure according to claim 1, characterized in that: During the jet grouting process, the bottom end of the precast inclined pile (3) is enlarged by spraying grout to facilitate the formation of a cured head (322) after curing.

5. The construction method of the inclined bracing pile support structure according to claim 2, characterized in that: After the jet grouting step is completed, remove the jet grouting power head (331) and jet grouting drill rod (332), and reuse them for the construction of the next precast inclined pile (3) or clean the jet grouting power head (331) and jet grouting drill rod (332) in time to prevent cement slurry from clogging them.

6. The construction method of the inclined bracing pile support structure according to claim 5, characterized in that: After the jet grouting step, wait for the soil solidification part (321) and the solidification head (322) to solidify and form, and then carry out the casting construction of the cap beam (21) on the pile (2). After the cap beam (21) solidifies and forms, the precast inclined pile (3) is fixed to the pile (2).

7. The construction method of the inclined bracing pile support structure according to claim 6, characterized in that: After the crown beam (21) is cured and formed, the construction of the building structure (4) is carried out. After the construction of the building structure (4) is completed, cured and reaches the concrete strength and is backfilled and compacted, the upper and lower ends of the precast inclined pile (3) are cut off along the inner and outer sides of the side plate (42), the precast inclined pile (3) is cut off along the upper surface edge of the bottom plate (41), and the connection between the crown beam (21) and the precast inclined pile (3) is cut off and removed.

Images