Inclined support threaded pile support structure for foundation pit support and construction method thereof

Abstract

The application discloses a kind of inclined support threaded pile support structures for foundation pit support, including support pile, foundation bottom plate located below soil layer and multiple threaded piles, the upper end of each threaded pile is connected with the upper end of support pile, each threaded pile passes through foundation bottom plate and at least partially enters the bracing force soil layer below foundation bottom plate, the threaded pile is gradually inclined towards from top to bottom, characterized by: the water stop sleeve is arranged in the foundation bottom plate, and the water stop sleeve is arranged on the outer periphery of the threaded pile and is detachably connected with the threaded pile.The construction method of the inclined support threaded pile support structure is also disclosed.Compared with the prior art, the application has the advantages that: by arranging the water stop sleeve in the foundation bottom plate, the water stop sleeve is detachably connected with the threaded pile, the threaded pile can be easily removed and recycled, the construction cost is reduced, the construction joint problem does not need to be considered, the structure is easy to handle in later period, and the quality is reliable.

Description

TECHNICAL FIELD

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

[0002] In deep foundation pit engineering, support system is often needed to increase the safety and stability of the foundation pit engineering, to ensure that the surrounding environment of the foundation pit, the engineering pile in the foundation pit and the like do not have any impact, and to ensure the safety of construction personnel and machinery. Currently, several support forms are commonly used, including flat support, diagonal support and anchor.

[0003] The flat support is the most widely used support form in deep foundation pit engineering. However, the flat support generally has a large span, a long construction period, a high cost, a complex support structure system, and is extremely unfavorable for earth excavation and main structure construction. Meanwhile, the support form needs to be completely removed in the later period, which causes serious environmental pollution and many safety hazards.

[0004] The anchor commonly includes jet grouting anchor rod and cable or soil nailing wall. However, the support form is not suitable for deep foundation pits with poor soil properties such as soft soil, has a low safety factor, has a large construction quality safety hazard, and needs to extend out of the building red line by tens of meters or even hundreds of meters due to the long anchoring length, which is greatly restricted by the surrounding environment.

[0005] The diagonal support commonly includes reinforced concrete, steel pipe or profile steel diagonal support, and is supported on the basement slab, which is relatively economical. The support form is commonly used in central island excavation, secondary support construction area or local reinforcement, and cannot play a role until the strength of the basement slab reaches 75% or more, which has a long construction period and slow deformation control reaction. The structure at the place is difficult to remove and process in the later period.

[0006] A diagonal support pile structure for foundation pit support and a construction method thereof are disclosed in Chinese Patent No. 201410107071.1. The structure includes a support pile, a crown beam, a foundation pit slab, a building structure, a diagonal support pile, a water stop device and a soil improvement structure. The diagonal support pile is obliquely implanted in the original soil below the foundation pit slab at a certain angle, and the original soil is hardened by high-pressure jet grouting pile or soil solidifying agent. The top end of the diagonal support pile is fixedly connected with the top end of the support pile, embedded in the interior of the crown beam and integrally cast with the crown beam, and the water stop ring is arranged at the position where the foundation pit slab and the shear wall pass through the building structure slab.

[0007] The invention patent can advantageously excavate earthwork, shorten construction period relative to flat support, and save construction period relative to traditional support throwing; however, the device of the patent is disposable and cannot be recycled and reused, cannot realize material saving, and inevitably increases the cost of foundation pit; although the soil at the bottom of the support is improved, the H-shaped steel structure, steel lattice column structure or steel pipe structure all rely on friction resistance to provide inclined support force, and the support effect is still difficult to guarantee, especially in saturated soft soil areas, and cutting off the H-shaped steel structure, steel lattice column structure or steel pipe structure will cause leakage of basement structure or affect the durability of the structure in the later period; the support cannot provide effective adjustment and reinforcement measures itself when the foundation pit deforms greatly, and additional measures or reinforcement measures need to be taken to solve the problem, which is extremely unfavorable for the disposal efficiency of the project with high risk such as foundation pit.

[0008] However, due to the increasingly complex surrounding environment of the foundation pit at present, for example: the surrounding buildings are close to the building red line, the types and number of pipelines around the foundation pit are various, and the site is narrow, which leads to the material storage and processing area adjacent to the foundation pit deformation. When the foundation pit deforms greatly, it is often impossible to provide reinforcement support by the enclosure itself, and external support system needs to be added to control the deformation.

[0009] In addition, "building resource-saving and accelerating the construction of a resource-saving society" is a basic national policy adhered to for a long time in China, and reducing the cost of foundation pit under the premise of ensuring the safety of foundation pit is the pursuit of project investors. There are many phenomena of waste of materials and labor resources in traditional foundation pit engineering, and the support form has large engineering quantity, high cost and serious solid dust pollution in the later period.

[0010] Therefore, further improvement is needed. SUMMARY

[0011] The first technical problem to be solved by the present application is to provide an inclined support threaded pile support structure for foundation enclosure, which can provide high support force, can be adjusted and reinforced according to the deformation of foundation pit, and is convenient for recycling and reuse.

[0012] The second technical problem to be solved by the present application is to provide a construction method of the inclined support threaded pile support structure.

[0013] The technical scheme adopted by the present application to solve the first technical problem is: a diagonal support threaded pile supporting structure for foundation pit support, comprising a supporting pile, a foundation bottom plate located below the soil layer, and a plurality of threaded piles, the upper end of each threaded pile being connected with the upper end of the supporting pile, each threaded pile penetrating the foundation bottom plate from above the foundation bottom plate and at least partially entering the supporting soil layer below the foundation bottom plate, the threaded piles gradually inclining towards each other from top to bottom, characterized in that: a water stop sleeve is arranged in the foundation bottom plate at the position penetrated by the threaded piles, the water stop sleeve being arranged on the outer periphery of the threaded pile and being detachably connected with the threaded pile.

[0014] Preferably, in order to facilitate the rotation and recovery of the threaded pile, an internal thread is arranged on the inner side of the water stop sleeve, so as to be threadedly connected with the threaded pile, facilitating the rotation and recovery of the threaded pile, and the internal thread in the water stop sleeve is also conducive to increasing the water stopping property of the foundation bottom plate.

[0015] Preferably, in order to provide sufficient supporting force, the wall thickness of the water stop sleeve is greater than or equal to 2.0 mm.

[0016] Preferably, in order to facilitate the control of the deformation of the foundation pit, a corbel is arranged at the upper end of the supporting pile, and the corbel and the threaded pile are connected through adjustable anchoring devices.

[0017] Preferably, in order to facilitate the connection of the corbel and the threaded pile, corbel brackets connected with the threaded piles are arranged at intervals along the direction of the corbel, and holes or open grooves are formed in the corbel for the end portions of the threaded piles to enter.

[0018] Preferably, in order to provide better diagonal supporting force and anti-pulling bearing capacity, while facilitating the removal, each threaded pile comprises a first threaded pile segment and a second threaded pile segment connected with each other, the first threaded pile segment being located above the second threaded pile segment, the second threaded pile segment penetrating the foundation bottom plate and being screwed into the soil layer, the second threaded pile segment being connected with the water stop sleeve and being mechanically engaged with the soil layer through a screw blade, and the width of the screw blade of the second threaded pile segment is greater than or equal to 120 mm.

[0019] The technical scheme adopted by the present application to solve the second technical problem is: a construction method of the diagonal support threaded pile supporting structure as described above, comprising the following steps:

[0020] 1) supporting pile construction: constructing the supporting pile around the foundation pit, and pouring a corbel at the upper end of the supporting pile for connecting with the threaded pile;

[0021] 2) installing the threaded pile: connecting the first threaded pile segment and the second threaded pile segment into an integral threaded pile, screwing the threaded pile into the soil layer at a certain angle, and until a certain depth below the designed foundation bottom plate is reached;

[0022] 3) Detecting bearing capacity: extract a number of threaded piles to detect the oblique bearing capacity, and determine the support surplus of the threaded piles;

[0023] 4) Anchoring threaded piles: process the anchoring position of the threaded piles, and cover the anchoring device. After the crown beam concrete strength reaches a certain degree, the threaded piles are evenly tightened and anchored along the foundation pit, so that the support piles and threaded piles form a whole structure with mutual force;

[0024] 5) Excavating foundation pit: after the crown beam reaches a certain strength, excavate the foundation pit;

[0025] 6) Foundation bottom plate construction: after the foundation pit is excavated, construct the foundation bottom plate. During the construction of the foundation bottom plate, the water stop sleeve is placed in the foundation bottom plate and fixed;

[0026] 7) Removing threaded piles: after the foundation bottom plate construction is completed and the support removal conditions of the enclosure design requirements are met, first loosen the anchoring device at intervals, then monitor the foundation pit deformation. If the data is stable, remove and recycle the threaded piles. If the data is not stable, take reinforcement measures to ensure the safety of the foundation pit.

[0027] Preferably, to control the deformation of the foundation pit, in steps 5) and 6), if the deformation of the foundation pit exceeds the value required by the enclosure design and specification, further tighten the anchoring device to control the deformation of the foundation pit. If the deformation of the foundation pit is controlled, no reinforcement measures are needed. If the deformation of the foundation pit is not controlled, reinforcement measures are needed.

[0028] Preferably, in step 7), when removing the threaded piles, remove and recycle them one by one. After removing the first threaded pile section, clean the water stop sleeve and then tighten the second threaded pile section.

[0029] Preferably, to avoid water leakage of the foundation bottom plate, a screw plate matching the screw leaf of the threaded pile is arranged on the inner wall of the water stop sleeve. After the threaded pile is recycled, the inside of the water stop sleeve is closed by concrete.

[0030] Compared with the prior art, the application has the advantages that: by arranging the water stop sleeve in the foundation base plate and detachably connecting the water stop sleeve and the screw pile, the screw pile can be conveniently removed and recycled, the construction cost is reduced, the construction joint problem does not need to be considered, the structure is simple and reliable in later period treatment, the screw pile and the supporting pile are connected through the adjustable anchoring device, the self-adjustment can be carried out according to the deformation of the foundation pit during the earthwork excavation and foundation construction, the safety of the foundation pit is ensured, the enclosure structure and the inclined support structure have no sequence in the construction process, the construction period can be greatly shortened, the support system does not need a large amount of reinforced concrete structure, the barrier-free earth excavation and structure construction can be realized, and the problem of uneven stress release or instantaneous unloading caused by the support removal can be effectively solved when the inclined support system is removed. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 FIG. 1 is a schematic view of the inclined support screw pile supporting structure of the embodiment of the application;

[0032] Figure 2 FIG. 4 is a sectional view of the water stop inner thread sleeve of the inclined support screw pile supporting structure of the embodiment of the application;

[0033] Figure 3 FIG. 6 is a two-section screw pile connecting node diagram of the inclined support screw pile supporting structure of the embodiment of the application;

[0034] Figure 4 FIG. 8 is a screw pile and crown beam connecting node diagram of the inclined support screw pile supporting structure of the embodiment of the application;

[0035] Figure 5 FIG. 10 is a local schematic view of the screw pile of the inclined support screw pile supporting structure of the embodiment of the application. DETAILED DESCRIPTION

[0036] The embodiments of the application are described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions.

[0037] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, since the disclosed embodiments of the present application can be arranged in different directions, so these orientation-indicating terms are only illustrative and should not be regarded as limiting, such as "upper", "lower" which are not necessarily limited to the direction opposite or consistent with the direction of gravity. In addition, the features defined as "first", "second" can be explicitly or implicitly included one or more features.

[0038] Referring to Figure 1 A diagonal support threaded pile supporting structure for foundation pit support, comprising a supporting pile 1, a foundation base plate 2 and a threaded pile 3. The supporting pile 1 extends longitudinally, and the foundation base plate 2 is located below the soil layer and at the bottom of the foundation pit, and a support changing belt 21 for facilitating force transmission is arranged between the periphery of the foundation base plate 2 and the supporting pile 1.

[0039] Referring to Figure 1 and Figure 3 The threaded pile 3 has a plurality of steel pipes made of metal, each threaded pile 3 comprising a first threaded pile section 31 and a second threaded pile section 32, wherein the first threaded pile section 31 is located above the second threaded pile section 32, and the lower end of the first threaded pile section 31 and the upper end of the second threaded pile section 32 are connected to form a complete threaded pile 3. The first threaded pile section 31 and the second threaded pile section 32 are connected by a steel pipe sleeve and are reinforced at the connection node, and can be removed and recycled in sections when removed. The upper end of each threaded pile 3 is connected to the upper end of the supporting pile 1, and the lower end of each threaded pile 3 enters the supporting soil layer below the foundation base plate 2. Each threaded pile 3 is inclined at a certain angle to the vertical direction and penetrates the foundation base plate 2 elevation into the soil layer by screwing. Two threaded piles 3 gradually incline towards each other from top to bottom.

[0040] Referring to Figure 1 and Figure 4The upper end of the support pile 1 is provided with a corbel 11, the corbel 11 is provided with a hole or an open slot 12, the upper end of the first threaded pile section 31 is connected with the corbel 11 through an anchoring device 13, and the upper end of the first threaded pile section 31 enters the hole or the open slot 12. The anchoring device 13 is preferably an adjustable nut. In this way, the threaded pile 3 and the support pile 1 form an integral whole. If the deformation of the foundation pit is large in the later period, the anchoring device 13 can be tightened by screwing to achieve the effect of controlling the deformation of the foundation pit. Preferably, the corbel 11 is provided with a reinforced concrete or steel structure bracket 14. The bracket 14 is arranged at 90 degrees with the threaded pile 3, which is convenient for fixing and adjusting the anchoring device 13 in the later period.

[0041] Referring to Figure 5 The threaded pile 3 belongs to an irregular pile, which is embedded into the soil body through the threads formed around the pile body, so that the stress form is greatly improved. The first threaded pile section 31 can be a shallow thread or a smooth round steel pipe, but in the anchoring area of the corbel 11, it is provided with a shallow and thick thread, and is provided with a corresponding type of anchoring device 13. The second threaded pile section 32 adopts a wide spiral blade, and the majority of the oblique supporting force is provided by the spiral linear pile end bearing formed by the mechanical engagement of the spiral blade of the threaded pile 3 and the soil body, and the thickness of the spiral blade is increased to improve the overall rigidity, so as to be able to provide a large oblique supporting force and a large uplift bearing capacity.

[0042] The soil layer at the lower end of the threaded pile 3 should be determined according to its physical and mechanical properties. If it is supported in a granular soil layer, the screwing of the spiral blade of the threaded pile 3 can produce a shearing compaction effect on the soil body, so as to be able to provide a high supporting force; in a soil layer with good shear performance, as long as the soil body is not disturbed, the threaded pile 3 is screwed into and out of the fixed threaded path, so as to be able to provide a high supporting force; when a soil layer with poor physical and mechanical properties, such as soft soil, is encountered, a grouting pipe can be arranged in the inner cavity of the steel pipe of the threaded pile 3, grouting holes 321 are arranged on the steel pipe wall of the second threaded pile section 32 and the drill bit position, and cement slurry is sprayed and mixed while the threaded pile 3 is screwed, so as to reinforce the soil layer, thereby forming a hard soil supporting structure.

[0043] Preferably, the wall thickness of the threaded pile 3 is 5-15 mm, the diameter of the steel pipe is ≥80 mm, the thickness of the spiral blade is ≥3.5 mm, and the width of the spiral blade is determined according to the engineering test, and the width is preferably ≥120 mm.

[0044] Referring to Figure 1 and Figure 2, the foundation base plate 2, at the place where the second threaded pile section 32 penetrates, is provided with a water stop sleeve 4, which is located on the outer periphery of the second threaded pile section 32. The water stop sleeve 4 is preferably two semicircular pipe fittings which are spliced into a whole circle by welding and are arranged on the outer periphery of the threaded pile 3. By arranging the water stop sleeve 4, firstly, the effect of later water stopping is achieved, and secondly, the threaded pile 3 can be rotated back for recycling in the later period. The water stop sleeve 4 has internal threads, the second threaded pile section 32 penetrates the water stop sleeve 4 and is threadedly connected. The internal threads of the water stop sleeve 4 are also beneficial to increase the water stopping property of the foundation base plate 2. A reinforcing bar is welded on the outer periphery of the water stop sleeve 4 to strengthen the connection between the water stop sleeve 4 and the foundation base plate 2, and a screw plate 41 which matches the screw blade of the threaded pile 3 is arranged inside the water stop sleeve 4, the internal threads are formed on the screw plate 41, and the water stop sleeve 4 can be closed by micro-expansion concrete which is one level higher than the foundation base plate 2 in the later period, thereby avoiding the problem of water leakage of the foundation base plate 2.

[0045] Preferably, the wall thickness of the water stop sleeve 4 is ≥2.0mm, the pitch and width of the internal threads inside the water stop sleeve 4 correspond to the pitch and width of the second threaded pile section 32, and the embedding angle is the same as that of the threaded pile 3. The water stop sleeve 4 needs to be sleeved into the foundation base plate 2 before the threaded pile 3 is fixed and good protection measures in the later period are taken. When the water stop sleeve 4 is connected with the foundation base plate 2, four peripheral reinforcing bars need to be welded and fixed to prevent misplacement or damage of the foundation base plate 2 during construction, which leads to the failure of rotating back the threaded pile 3 in the later period.

[0046] Alternatively, the inner side wall surface of the water stop sleeve 4 can also be smooth, in which case the threaded pile 3 penetrates the water stop sleeve 4 and can move relative to the water stop sleeve 4. The water stop sleeve 4 can be provided with annular water stop steel plates on the inner side wall surface to play the role of water stopping. As long as the water stop sleeve 4 is arranged in the foundation base plate 2 and the connection between the water stop sleeve 4 and the threaded pile 3 is a non-fixed detachable connection mode, the rotating back of the threaded pile 3 can be realized.

[0047] The construction method of the inclined supporting threaded pile supporting structure includes the following steps:

[0048] 1) Construction of supporting pile 1: The supporting pile 1 is constructed around the preset foundation pit, the reinforced concrete corbel 14 is arranged at intervals along the direction of the corbel 11, the hole or open slot 12 is reserved on the corbel 11 to form a straight-through hole for the rotation of the threaded pile 3, and the position and number of the corbel 14 correspond to the hole or open slot 12 respectively; the distance between the corbels 14 is equal to the distance between the threaded piles 3, and the corbel 11 is preferably provided with reinforcing steel bars;

[0049] 2) Install threaded pile 3: the first threaded pile section 31 and the second threaded pile section 32 are connected into a whole threaded pile 3, the threaded pile 3 is screwed into the soil layer at a certain angle by a drilling machine until it reaches a certain depth below the designed foundation bottom plate 2 (a certain depth below the soil layer); in this embodiment, the soil layer is granular soil, and no high-pressure grouting is required after screwing in place; the drilling machine is preferably a drilling machine that can adjust the angle by 90 degrees, the length, pitch distance, and width of the second threaded pile section 32 that provides support force need to be determined in advance by oblique compression detection to determine the standard, and an isolation sleeve needs to be set in the upper section of the excavation area during detection to obtain reliable support force data;

[0050] 3) Detect bearing capacity: a certain number of threaded piles 3 are extracted for oblique compression bearing capacity detection to ensure the safety of the foundation pit; when performing compression detection, a pressurizing device can be set at the corbel 14 position to ensure that the applied force is on the same force axis as the threaded pile 3; the support margin of the threaded pile 3 also needs to be determined during detection to ensure that the margin can be used for self-adjusting reinforcement when the foundation pit deforms significantly later;

[0051] 4) Anchor threaded pile 3: the anchoring position of the threaded pile 3 is treated and fitted into the anchoring device 13, and after the crown beam 11 reaches a certain degree of concrete strength, such as 75%, the threaded pile 3 is uniformly tightened and anchored along the foundation pit through the anchoring device 13, at this time, the support pile 1 and the threaded pile 3 form a whole structure with mutual force;

[0052] 5) Excavate foundation pit: after the crown beam 11 reaches a certain strength, excavate the soil according to the specifications and the special soil excavation construction plan, since the threaded pile 3 has been used for oblique support and a certain amount of prestress can be applied by screwing according to the foundation pit and soil excavation conditions, the soil excavation of the foundation pit can be excavated to the designed elevation in one time, without local excavation and then large-area soil excavation;

[0053] 6) Foundation bottom plate 2 construction: after the foundation pit is excavated, the foundation bottom plate 2 is constructed, such as cushion, brick membrane, bottom plate waterproofing, bottom plate reinforcement binding, and support belt replacement; when constructing the foundation bottom plate 2, the water stop sleeve 4 is placed in the foundation bottom plate 2 and fixed firmly by welding steel bars, and the water stop sleeve 4 is directly poured into the foundation bottom plate 2 during the pouring of the foundation bottom plate 2; measures need to be taken to ensure that no concrete and cement slurry enter the water stop sleeve 4 during pouring to ensure that the second threaded pile section 32 can be smoothly screwed back later;

[0054] 7) Demolition of threaded pile: after the foundation bottom plate 2 is constructed and the support removal condition of the design requirement is reached, the anchoring device 13 is first loosened at intervals, and then the foundation pit deformation monitoring is carried out, if the data is stable, the threaded pile 3 can be removed and recycled one by one, if the data is unstable, other reinforcement measures need to be taken to ensure the safety of the foundation pit; when removing, remove and recycle one by one, each threaded pile first removes the first threaded pile section 31, after cleaning the water stop sleeve 4, the second threaded pile section 32 is screwed and recycled; after the threaded pile 3 is recycled, high-grade micro-expansion concrete is used to close the pile hole, and maintenance work is done well;

[0055] In steps 5) and 6), if the deformation of the foundation pit is large and has exceeded the value required by the design and specification of the enclosure, the anchoring device 13 can be further screwed and tightened to control the deformation of the foundation pit, and after the deformation of the foundation pit is controlled, no reinforcement measures need to be taken, if the deformation of the foundation pit is not controlled, reinforcement measures need to be taken.

[0056] The inclined support threaded pile structure of the present application has the advantages of recyclability, high support force, and the ability to adjust the inclined support pile structure according to the deformation of the foundation pit, solving the problems of complex conventional foundation pit support process, high cost, and resource waste, ensuring the safety, economy and environmental protection of the foundation pit construction. After the inclined support is completed and the pressure support force detection is completed, the foundation pit can be excavated at one time, and the mechanical excavation operation space is large; during the construction of the foundation pit bottom plate, the water stop internal threaded sleeve is buried, which can be constructed integrally with the intersection part of the inclined support pile, and the structure of the concave-convex thread inside the water stop steel plate outside the sleeve can effectively solve the problem of water leakage at the intersection part in the later period. When the inclined support system is removed, it can be unloaded and monitored at the same time, effectively solving the problem of uneven stress release or instantaneous unloading caused by support removal.

Claims

1. A construction method of a diagonal support thread pile supporting structure, which is a diagonal support thread pile supporting structure for a foundation pit enclosure, the diagonal support thread pile supporting structure comprising a support pile (1), a foundation base plate (2) located below a soil layer, and a plurality of thread piles (3), an upper end of each thread pile (3) being connected to an upper end of the support pile (1), each thread pile (3) passing through the foundation base plate (2) to at least partially enter a strutting soil layer below the foundation base plate (2), the thread piles (3) being gradually inclined toward each other from top to bottom, characterized in that: The foundation slab (2) is provided with a water stop sleeve (4) at the position penetrated by the screw pile (3), the water stop sleeve (4) is arranged on the outer periphery of the screw pile (3) and detachably connected with the screw pile (3), the upper end of the support pile (1) is provided with a corbel (11), the corbel (11) and the screw pile (3) are connected through adjustable anchoring devices (13); The construction method comprises the following steps: 1) support pile (1) construction: construction of support pile (1) around the foundation pit, pouring of corbel (11) for connecting with screw pile (3) at the upper end of support pile (1); 2) installation of screw pile (3): connecting the first screw pile section (31) and the second screw pile section (32) into an integral screw pile (3), screwing the screw pile (3) into the soil layer at a certain angle until a certain depth below the designed foundation slab (2) is reached; 3) detection of bearing capacity: a certain number of screw piles (3) are extracted for oblique compression bearing capacity detection, and the support surplus of the screw pile (3) is determined; 4) anchoring of screw pile (3): processing the anchoring position of the screw pile (3) and sleeving into the anchoring device (13), after the corbel (11) concrete strength reaches a certain degree, the screw pile (3) is uniformly screwed with the corbel (11) through the anchoring device (13) along the foundation pit, so that the support pile (1) and the screw pile (3) form an integral structure with mutual force; 5) excavation of foundation pit: after the corbel (11) reaches a certain strength, the foundation pit is excavated; 6) foundation slab (2) construction: after the foundation pit is excavated, the foundation slab (2) is constructed, the water stop sleeve (4) is placed in the foundation slab (2) and fixed during the construction of the foundation slab (2); 7) removal of screw pile (3): after the construction of the foundation slab (2) is completed and the support removal conditions required by the enclosure design are met, the anchoring device (13) is first loosened at intervals, and then the foundation pit deformation is monitored, if the data is stable, the screw pile (3) is removed and recycled, if the data is not stable, reinforcement measures are taken to ensure the safety of the foundation pit; a screw plate matched with the screw leaf of the screw pile (3) is arranged on the inner wall of the water stop sleeve (4), and the inside of the water stop sleeve (4) is closed by concrete after the screw pile (3) is recycled; In steps 5) and 6), if the foundation pit deformation exceeds the value required by the enclosure design and specification, the anchoring device (13) is further screwed to control the deformation of the foundation pit, and if the deformation of the foundation pit is not controlled, reinforcement measures need to be taken.

2. The construction method of batter pile supporting structure according to claim 1, characterized in that: In step 7), the screw pile (3) is removed and recycled one by one, the first screw pile section (31) is removed from each screw pile (3), and the second screw pile section (32) is screwed and recycled after cleaning the water stop sleeve (4).

3. The construction method of batter pile supporting structure according to claim 1, characterized in that: The inner side of the water stop sleeve (4) is provided with an internal thread, so as to be threadedly connected with the screw pile (3).

4. The method of construction of a batter pile supported structure according to claim 3, wherein: The wall thickness of the water stop sleeve (4) is greater than or equal to 2.0 mm.

5. The construction method of batter pile supporting structure according to claim 1, characterized in that: Corbel (14) connected with threaded pile (3) is arranged at intervals along the direction of the crown beam (11), and the crown beam (11) is provided with a hole or an open slot (12) for the end of the threaded pile (3) to enter.

6. The construction method of batter pile supporting structure according to claim 1, characterized in that: Each threaded pile (3) comprises a first threaded pile section (31) and a second threaded pile section (32) connected with each other, the first threaded pile section (31) is located above the second threaded pile section (32), the second threaded pile section (32) penetrates through the foundation bottom plate (2) and is screwed into the soil layer, the second threaded pile section (32) is connected with the water stop sleeve (4) and is mechanically engaged with the soil layer through the screw blade, and the width of the screw blade of the second threaded pile section (32) is greater than or equal to 120 mm.

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