Deep foundation pit supporting structure and method

Abstract

The invention discloses a deep foundation pit supporting structure and method, and relates to the technical field of foundation pit supporting. The deep foundation pit supporting structure comprises a plurality of drilling piles, a top girth and a prestress reinforcing structure. The plurality of drilling piles are uniformly arranged on the peripheral side of the deep foundation pit; the top girders are fixedly arranged at the tops of the drilling piles; the prestress reinforcing structure is arranged on the top girth and used for reinforcing the top girth. Based on the technical scheme disclosed by the invention, on the basis of ensuring the safety of the supporting structure, not only can the top girth be fully utilized and the waste be avoided, but also the convenience of construction can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support, and in particular to a deep foundation pit support structure and a support method. Background Art

[0002] During the construction of buildings and other projects, the first challenge is the construction of deep foundation pits. Conventional technologies typically employ a support system consisting of piles and internal supports. However, because the support system is located within the pit, this support system can compromise structural safety and ease of construction. Furthermore, removing the supports wastes material and time, necessitating urgent improvements. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above technical deficiencies and propose a deep foundation pit support structure and support method to solve the technical problems of insufficient safety and construction convenience of deep foundation pit support structures in the existing technology, as well as high costs.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a deep foundation pit support structure, comprising: A plurality of bored piles are evenly arranged around the periphery of the deep foundation pit; a top enclosing beam fixedly disposed on top of the plurality of bored piles; and A prestressed reinforcement structure is provided on the top enclosing beam and is used for reinforcing the top enclosing beam.

[0005] In some embodiments, the prestressed reinforcement structure comprises: A plurality of prestressed ducts are arranged inside the top surrounding beam; A plurality of prestressed steel cables are respectively arranged in the plurality of prestressed channels; and A plurality of fixing assemblies are respectively used to fix the plurality of prestressed steel cables.

[0006] In some embodiments, the fixing assembly includes: an extruded sleeve, disposed on one side of the top enclosing beam and detachably fixedly connected to one end of the corresponding prestressed steel cable; and An anchor clip is arranged on one side of the top enclosing beam and is detachably fixedly connected to an end of the prestressed steel cable away from the extrusion sleeve, and is used to cooperate with the extrusion sleeve to tension and fix the prestressed steel cable.

[0007] In some embodiments, the fixing assembly includes: a plurality of threaded sleeves fixedly disposed inside the top enclosing beam and spaced apart along the prestressed steel cables; and A plurality of threaded members are respectively threadedly connected in the plurality of threaded sleeves and are used for abutting against the prestressed steel cables.

[0008] In some embodiments, the threaded sleeve comprises: a transverse tube, sleeved on the outside of the prestressed steel cable, for positioning the prestressed steel cable; and The vertical tube is vertically arranged with respect to the transverse tube and communicates with the transverse tube, and is used for being threadedly connected with the threaded member.

[0009] In some embodiments, the fixing assembly further comprises: A plurality of clamping blocks are respectively arranged in the plurality of threaded sleeves and are respectively used to cooperate with the plurality of threaded members to tighten the prestressed steel cables.

[0010] In some embodiments, the fixing assembly further includes a corrugated pipe sleeved on the prestressed steel cable, the threaded sleeve is sleeved on the corrugated pipe through the transverse pipe, and the vertical pipe is connected to the corrugated pipe.

[0011] In some embodiments, the prestressed steel cable is a post-tensioned prestressed steel cable, and the material of the post-tensioned prestressed steel cable is a galvanized steel wire rope.

[0012] In some embodiments, the top perimeter beam includes a plurality of post-tensioned prestressed simply supported beams that are sequentially connected end to end, and any two adjacent post-tensioned prestressed simply supported beams support each other.

[0013] In a second aspect, the present invention further provides a deep foundation pit support method, which uses the above-mentioned deep foundation pit support structure, comprising: Casting of top beams; Inserting prestressed steel cables into the prestressed channel and tensioning each prestressed steel cable one by one; Fixing both ends of the prestressed steel cables after tensioning; A plurality of fixing points are arranged at intervals in the extending direction of the prestressed steel cable, and the prestressed steel cable is fixed at each fixing point to form the deep foundation pit support structure.

[0014] Compared with the existing technology, the present invention provides a deep foundation pit support structure and support method, which casts a top enclosing beam on the top of multiple bored piles and arranges a prestressed reinforcement structure on the top enclosing beam to support the foundation pit with a beam system, effectively expand the internal space of the foundation pit, and use the top enclosing beam as the basis for other structures. On the basis of ensuring the safety of the support structure, it can not only make full use of the top enclosing beam and avoid waste, but also help to improve the convenience of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a top view of a deep foundation pit support structure according to an embodiment of the present invention; Figure 2 is a top view of a plurality of bored piles according to an embodiment of the present invention; Figure 3 Schematic diagram of the arrangement of prestressed steel cables on a top perimeter beam in one embodiment of the present invention; Figure 4 yes Figure 1 The cross-sectional diagram along the AA direction is mainly used to show the prestressed reinforcement structure; Figure 5 yes Figure 4 The partial enlarged view of part B is mainly used to show the fixed components; Figure 6 yes Figure 1 The partial enlarged view of part C in the middle is mainly used to show the extruded sleeve and anchor clip; Figure 7 This is a schematic diagram of the overall process of a deep foundation pit supporting method according to one embodiment of the present invention; Figure 8 Schematic diagram of a prestressed steel cable tensioning method in one embodiment of the present invention.

[0016] Explanation of the accompanying symbols: 1. Deep foundation pit; 2. Bored pile; 3. Top enclosure beam; 31. Post-tensioned prestressed simply supported beam; 311. Splicing structure; 312. Prestressed duct; 4. Prestressed steel cable; 5. Fixing assembly; 51. Corrugated pipe; 52. Threaded sleeve; 521. Horizontal pipe; 522. Vertical pipe; 53. Compression bolt; 54. Block; 55. Extrusion sleeve; 56. Steel pad; 57. Anchor clamp; 571. First anchor clamp; 572. Second anchor clamp; 6. Load-bearing frame; 7. Jack. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] In order to solve the above technical problems, the present invention provides a deep foundation pit support structure and support method, which can not only avoid waste but also help improve the convenience of construction on the basis of ensuring the safety of the support structure.

[0019] See also Figure 1-2 The present invention provides a deep foundation pit support structure, including a plurality of bored piles 2, the plurality of bored piles 2 serving as pile foundations, a top enclosing beam 3 fixedly provided on the top, and a prestressed reinforcement structure provided on the top enclosing beam 3.

[0020] In this way, under the reinforcement effect of the prestressed reinforcement structure, a protection system for the deep foundation pit 1 can be formed by combining the bored piles 2 with the top surrounding beams 3, which facilitates subsequent construction.

[0021] In this embodiment, the aforementioned multiple bored piles 2 can be arranged side by side and evenly distributed around the perimeter of the deep foundation pit 1, so that the multiple bored piles 2 can enclose the designed deep foundation pit area. Based on this, the number of bored piles 2 can be determined based on the size of the deep foundation pit 1, and the arrangement of the multiple bored piles 2 can be determined based on the shape of the deep foundation pit 1, and there are no specific limitations on this.

[0022] The top enclosing beam 3 can be constructed using post-tensioned prestressed concrete. With the help of reinforced concrete at the tops of the bored piles 2, the top enclosing beam 3 and the bored piles 2 can be fixedly connected by pouring concrete, forming an effective integrated system. The overall shape of the top enclosing beam 3 can be determined based on the arrangement of the bored piles 2, while its detailed structure and dimensions can be flexibly set according to design requirements and are not specifically limited.

[0023] For example, in one embodiment, the top perimeter beam 3 may be a square structure, which includes four post-tensioned prestressed simply supported beams 31 that are spliced ​​end to end. At this time, in order to realize the splicing of each post-tensioned prestressed simply supported beam 31, a splicing structure 311 may be provided at both ends of each post-tensioned prestressed simply supported beam 31. The specific structural form of the splicing structure 311 may be flexibly designed as needed. For example, the splicing structure 311 may be as follows: Figure 1 The ladder-shaped structure shown is not specifically limited to this.

[0024] In this way, the four post-tensioned prestressed simply supported beams 31 are sequentially spliced ​​end to end through the above-mentioned splicing structure 311 , and any two adjacent post-tensioned prestressed simply supported beams 31 serve as a mutual support system and constitute the above-mentioned top enclosing beam 3 as a whole.

[0025] See also Figure 3-4 In this embodiment, the main function of the above-mentioned prestressed reinforcement structure is to reinforce the top enclosing beam 3 so that the top enclosing beam 3 and the bored piles 2 can form a reliable support system.

[0026] Combined with attachment Figure 5 The prestressed reinforcement structure may include multiple prestressed channels 312, multiple prestressed steel cables 4 and multiple fixing components 5. The multiple prestressed channels 312 are arranged on the top beam 3, and the multiple prestressed steel cables 4 are respectively arranged in the multiple prestressed channels 312, and the multiple fixing components 5 are respectively used to fix the multiple prestressed steel cables 4.

[0027] Specifically, taking the structural form of the top perimeter beam 3 using four post-tensioned prestressed simply supported beams 31 spliced ​​end to end as an example, a plurality of prestressed channels 312 can be set on each post-tensioned prestressed simply supported beam 31, and the plurality of prestressed channels 312 can be in the form of pre-buried pipes on the corresponding post-tensioned prestressed simply supported beam 31, and can be formed simultaneously when the corresponding post-tensioned prestressed simply supported beam 31 is cast.

[0028] It can be understood that on any post-tensioned prestressed simply supported beam 31, multiple prestressed channels 312 are preferably arranged on the post-tensioned prestressed simply supported beam 31 near the connection between it and the bored pile 2; and the number and location of the prestressed channels 312 on each post-tensioned prestressed simply supported beam 31 can be determined in combination with structural analysis and simulation, and no specific limitation is given to this.

[0029] On this basis, the above-mentioned prestressed steel cables 4 and prestressed channels 312 can be arranged in a one-to-one correspondence, that is, a prestressed steel cable 4 can be passed through each prestressed channel 312, and each prestressed steel cable 4 corresponds to a set of fixing components 5 for fixing the prestressed steel cables 4.

[0030] In this embodiment, taking the prestressed steel cable 4 in any one of the prestressed channels 312 as an example, the prestressed steel cable 4 can be a post-tensioned prestressed steel cable 4, the material of which can be a galvanized steel wire rope, or other ropes or steel bars with strength that meets the design requirements, without specific limitation.

[0031] On this basis, the corresponding fixing component 5 includes a bellows 51 , which is located inside the post-tensioned prestressed simply supported beam 31 , is sleeved on the prestressed steel cable 4 , and is arranged in a one-to-one correspondence with the prestressed channel 312 .

[0032] In fact, the bellows 51 can constitute a pre-buried pipe for forming the prestressed channel 312, that is, when casting and forming the post-tensioned prestressed simply supported beam 31, the bellows 51 can be pre-buried in the mold, so that when the post-tensioned prestressed simply supported beam 31 is cast and formed, the post-tensioned prestressed simply supported beam 31 can form a corresponding prestressed channel 312 at the bellows 51.

[0033] See also Figure 4-5 In this embodiment, the fixing assembly 5 further includes a plurality of threaded sleeves 52 and a plurality of threaded parts. The plurality of threaded sleeves 52 cooperate with the plurality of threaded parts to further fix the prestressed steel cable 4.

[0034] Specifically, multiple threaded sleeves 52 are fixedly mounted inside the top perimeter beam 3 and spaced apart along the prestressed steel cables 4. Taking any one of the threaded sleeves 52 as an example, the threaded sleeve 52 may include a transverse tube 521 and a vertical tube 522. The transverse tube 521 may be sleeved onto the corrugated tube 51, while the vertical tube 522 is perpendicular to and connected to the transverse tube 521. Furthermore, the transverse tube 521 is also connected to the corrugated tube 51, facilitating the installation of threaded components.

[0035] It can be understood that the threaded sleeve 52 includes a horizontal tube 521 and a vertical tube 522 , and the horizontal tube 521 is perpendicular to the vertical tube 522 , so that the threaded sleeve 52 as a whole forms a T-shaped structure, constituting a three-way pipe structure.

[0036] Among them, the inner diameter of the horizontal tube 521 can be slightly larger than the outer diameter of the corrugated tube 51 (for example, the inner diameter of the horizontal tube 521 can be 1 mm larger than the outer diameter of the corrugated tube 51), so that the horizontal tube 521 can be installed on the outside of the corrugated tube 51 to connect the corrugated tube 51; the inner wall of the vertical tube 522 can be provided with a thread, which can be used to connect threaded parts, and its outer wall can be provided with a multi-protrusion structure, which can increase the bite force between the vertical tube 522 and the concrete.

[0037] It should be noted that, although the bellows 51 can also assist in fixing the prestressed steel cables 4 to a certain extent, the main function of the bellows 51 is to form corresponding prestressed channels 312 on the top surrounding beam 3 .

[0038] The corrugated pipe 51 is set in the mold in the form of a pre-buried pipe before casting the top enclosing beam 3. Therefore, the above-mentioned threaded sleeve 52 can be sleeved on the corrugated pipe 51 through the transverse pipe 521 before pouring the concrete, and can be pre-buried in the casting mold together with the corrugated pipe 51, so that the threaded sleeve 52 is pre-buried and fixed inside the top enclosing beam 3 when the top enclosing beam 3 is formed.

[0039] On the formed top beam 3, the corrugated tube 51 is sleeved on the prestressed steel cable 4, and the threaded sleeve 52 is sleeved on the outside of the corrugated tube 51 through the transverse tube 521. The vertical tube 522 is perpendicular to the transverse tube 521, and its pipe mouth away from the transverse tube 521 can extend to the outside of the top beam 3, which is convenient for the installation of threaded parts.

[0040] On this basis, the number of threaded sleeves 52 on each corrugated tube 51 can be flexibly set as needed. When the overall length of the corrugated tube 51 is longer (i.e., the prestressed steel cable 4 is longer), the number of threaded sleeves 52 can be appropriately increased; conversely, the number of threaded sleeves 52 can be appropriately reduced. This is determined by design requirements and is not specifically limited.

[0041] In this embodiment, based on the structure of the threaded sleeve 52 , the threaded member may be a cable compression bolt 53 , which is arranged in a one-to-one correspondence with the threaded sleeve 52 , that is, a cable compression bolt 53 may be arranged on each threaded sleeve 52 .

[0042] Specifically, the cable-holding bolt 53 can be threadedly connected to the threads on the inner wall of the vertical tube 522. When the cable-holding bolt 53 is rotated, it can reciprocate along the vertical tube 522. When the prestressed steel cable 4 needs to be fixed, the cable-holding bolt 53 can be tightened so that the end of the cable-holding bolt 53 is pressed against the prestressed steel cable 4 to achieve fixation; conversely, when the prestressed steel cable 4 needs to be loosened, the cable-holding bolt 53 can be turned in the opposite direction to loosen the prestressed steel cable 4.

[0043] It can be understood that since the prestressed steel cable 4 is located in the corrugated tube 51, and the horizontal tube 521 on the threaded sleeve 52 is sleeved on the outside of the corrugated tube 51, the vertical tube 522 can also play a role in positioning the prestressed steel cable 4, ensuring that the end of the cable compression bolt 53 can be aligned with the prestressed steel cable 4.

[0044] On this basis, the fixing assembly 5 can also include a plurality of clamping blocks 54 . The plurality of clamping blocks 54 can be respectively arranged in the plurality of threaded sleeves 52 , and can respectively cooperate with each cable compression bolt 53 to fix the prestressed steel cable 4 .

[0045] Specifically, the clamping blocks 54 are arranged in a one-to-one correspondence with the threaded sleeves 52, that is, each threaded sleeve 52 can be provided with a clamping block 54. In any threaded sleeve 52, the clamping block 54 can be arranged inside the transverse tube 521 and located on the side of the prestressed steel cable 4 close to the vertical tube 522. In this way, when the cable-holding bolt 53 is tightened, the end of the cable-holding bolt 53 presses the clamping block 54, causing the clamping block 54 to abut and compress the prestressed steel cable 4, thereby fixing the prestressed steel cable 4.

[0046] In order to ensure the fixing effect of the clamping block 54 on the prestressed steel cable 4, the side of the clamping block 54 close to the prestressed steel cable 4 is preferably set to a curved surface structure, and the clamping block 54 and the cable-pressing bolt 53 are preferably set to a point contact structure.

[0047] See also Figure 6 In this embodiment, the prestressed steel cable 4 is arranged inside the top surrounding beam 3 by the post-tensioning method; on this basis, in order to realize the tensioning and fixation of the prestressed steel cable 4, the above-mentioned fixing component 5 also includes an extrusion sleeve 55 and an anchor clip 57. The extrusion sleeve 55 and the anchor clip 57 can respectively fix the two ends of the prestressed steel cable 4. The cooperation between the two not only facilitates the tensioning of the prestressed steel cable 4, but also can fully fix the prestressed steel cable 4 after tensioning to maintain the prestress on the steel cable.

[0048] Specifically, on any post-tensioned prestressed simply supported beam 31, the extruded sleeve 55 is provided in a one-to-one correspondence with the prestressed steel cable 4. Taking any of the extruded sleeves 55 as an example, the extruded sleeve 55 is provided on one end face of the corresponding post-tensioned prestressed simply supported beam 31, and can abut against the end face of the top encircling beam 3 via a steel backing plate 56, thereby securing one end of the corresponding prestressed steel cable 4.

[0049] Similarly, the above-mentioned anchor clip 57 can be set on the end face of the other side of the post-tensioned prestressed simply supported beam 31, and a steel pad 56 can also be set on the end face. The anchor clip 57 can abut against the steel pad 56 and clamp the end of the prestressed steel cable 4.

[0050] It should be noted that the specific structures of the extrusion sleeve 55 and the anchor clip 57 are common knowledge in the art and are not the focus of the present invention, so they will not be described in detail here.

[0051] At the same time, considering the later recycling of the prestressed steel cables 4 on the top enclosing beam 3, the extruded sleeve 55, the anchor clip 57 and the prestressed steel cables 4 are all fixed in a detachable manner.

[0052] In addition, it can be understood that the above-mentioned top enclosing beam 3 is formed by splicing multiple post-tensioned prestressed simply supported beams 31 to form a square structure, but in other embodiments, when the corresponding foundation pit is a circular foundation pit, since multiple bored piles 2 form a circle, the shape of the top enclosing beam 3 can also be set to a circle; at this time, the top enclosing beam 3 can be formed by pouring concrete, and the above-mentioned prestressed reinforcement structure may not be set inside it.

[0053] See also Figure 7 Based on the above-mentioned deep foundation pit support structure, the present invention also provides a deep foundation pit support method, comprising the following steps: Casting the top beam 3; Insert the prestressed steel cables 4 into the prestressed channel 312 and tension each prestressed steel cable 4 one by one; Fixing both ends of the prestressed steel cable 4 after tensioning; A plurality of fixing points are arranged at intervals in the extending direction of the prestressed steel cable 4, and the prestressed steel cable 4 is fixed at each fixing point to form the above-mentioned deep foundation pit support structure.

[0054] Specifically, after the construction of the plurality of bored piles 2 is completed, the foundation of the top enclosing beam 3 can be excavated first. After the foundation excavation is completed, the cushion concrete can be poured, the reinforcement cage of the top enclosing beam 3 can be tied, and the embedded steel plate can be buried. The specific arrangement of the reinforcement cage and the embedded steel plate can be determined according to the design requirements and will not be detailed here.

[0055] After completing the above construction, threaded sleeves 52 can be placed outside the bellows 51 according to the spacing requirements, and any loose contact between the two can be sealed with glass glue. Then, the bellows 51 is connected to multiple threaded sleeves 52 and buried in the designated position within the casting mold. When supporting the side formwork, the threaded sleeves 52 can be fixed to the side formwork with cable bolts 53.

[0056] After the formwork is completed, the required top enclosing beam 3 can be formed by pouring concrete into the mold, which completes the above-mentioned step of "casting and forming the top enclosing beam 3".

[0057] During this process, with the help of the corrugated pipe 51 and the threaded sleeve 52 pre-buried in the mold, multiple prestressed channels 312 will be formed inside the top beam 3, and multiple threaded sleeves 52 will be simultaneously pre-buried and fixed inside the top beam 3 to facilitate subsequent construction.

[0058] The above-mentioned “inserting the prestressed steel cables 4 into the prestressed channel 312 and tensioning each prestressed steel cable 4 one by one” and “fixing both ends of the tensioned prestressed steel cables 4” specifically include: When the concrete of the top surrounding beam 3 solidifies and the strength reaches the tensioning strength requirement, a steel pad 56 can be placed on the non-tensioning end of the prestressed steel cable 4, the prestressed steel cable 4 can be inserted into the corresponding prestressed channel 312, and one end of the prestressed steel cable 4 can be fixed with an extrusion sleeve 55. Then, the prestressed steel cables 4 can be tensioned one by one according to the tensioning sequence.

[0059] See also Figure 7 Taking any of the prestressed steel cables 4 as an example, during the actual tensioning process, a steel backing plate 56 can be placed at the tensioning end and a load-bearing frame 6 can be erected. The prestressed steel cable 4 can then be tensioned using a jack 7. During tensioning, a first anchor clamp 571 can be used to clamp the prestressed steel cable 4 at the top of the jack 7. Once the prestressed steel cable 4 is tensioned, a second anchor clamp 572 can be used to clamp and secure the adjacent ends of the prestressed steel cable 4 using the steel backing plate 56 as a fulcrum, achieving tensioning and securing. After tensioning is complete, the ends of the prestressed steel cable 4 are secured by the extrusion sleeve 55 and the second anchor clamp 572, respectively, to ensure sufficient prestress in the cable.

[0060] It is understandable that the specific tensioning strength and tensioning sequence of the multiple prestressed steel cables 4 can be determined according to design requirements in combination with simulation, and no specific limitation is imposed on this.

[0061] On this basis, the above-mentioned “arranging a plurality of fixing points at intervals in the extending direction of the prestressed steel cable 4, and fixing the prestressed steel cable 4 at each fixing point to form the above-mentioned deep foundation pit support structure” specifically includes: After tensioning is completed, each threaded sleeve 52 on the prestressed steel cable 4 can constitute a fixed point, that is, a plurality of fixed points are arranged at intervals in the extending direction of the prestressed steel cable 4 .

[0062] At this time, taking any one of the fixed points as an example, the clamping block 54 can be placed into the inner side of the corrugated tube 51 from the pipe mouth of the vertical tube 522 on the threaded sleeve 52, so that it fits the internal prestressed steel cable 4, and then the cable compression bolt 53 is tightened so that the end of the cable compression bolt 53 presses against the clamping block 54.

[0063] In this way, at each fixed point, the cable compression bolt 53 will squeeze the block 54 so that the block 54 presses the prestressed steel cable 4 tightly, thereby fixing the middle part of the prestressed steel cable 4 and allowing the prestressed steel cable 4 to be fully combined with the top surrounding beam 3 to effectively reinforce the top surrounding beam 3.

[0064] It should be noted that after the construction of the deep foundation pit 1 is completed and backfilling is completed, the above-mentioned prestressed steel cables 4 and some of the supporting fixing components 5 can be removed and recovered, specifically including: When the construction of the deep foundation pit 1 is completed and the backfill is completed, the compression bolt 53 can be removed from the threaded sleeve 52 first, and then the prestressed steel cable 4 can be loosened in sequence with the jack 7 in the reverse order of the tensioning sequence, and the fixing of the extrusion sleeve 55 and the anchor clamp 57 on the prestressed steel cable 4 can be released. The prestressed steel cable 4 can then be removed from the corresponding prestressed channel 312 for recycling.

[0065] It can be seen that based on the above-mentioned deep foundation pit support structure and support method, the technical solution of the present invention can not only make full use of the top beam 3 on the basis of ensuring the safety of the support structure, but also realize the recycling and turnover of materials, save a large amount of steel, greatly reduce construction costs, and also help to improve the convenience of construction, indirectly improving the efficiency of deep foundation pit construction.

[0066] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0067] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0068] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A deep foundation pit support structure, characterized in that: include: A plurality of bored piles are evenly arranged around the periphery of the deep foundation pit; a top enclosing beam fixedly disposed on top of the plurality of bored piles; as well as A prestressed reinforcement structure is provided on the top enclosing beam and is used for reinforcing the top enclosing beam.

2. The deep foundation pit support structure according to claim 1, characterized in that: The prestressed reinforcement structure comprises: A plurality of prestressed ducts are arranged inside the top surrounding beam; A plurality of prestressed steel cables are respectively arranged in the plurality of prestressed channels; and A plurality of fixing assemblies are respectively used to fix the plurality of prestressed steel cables.

3. The deep foundation pit supporting structure according to claim 2, characterized in that: The fixing assembly includes: an extruded sleeve, disposed on one side of the top enclosing beam and detachably fixedly connected to one end of the corresponding prestressed steel cable; and An anchor clip is arranged on one side of the top enclosing beam and is detachably fixedly connected to an end of the prestressed steel cable away from the extrusion sleeve, and is used to cooperate with the extrusion sleeve to tension and fix the prestressed steel cable.

4. The deep foundation pit supporting structure according to claim 2, characterized in that: The fixing assembly includes: a plurality of threaded sleeves fixedly disposed inside the top enclosing beam and spaced apart along the prestressed steel cables; and A plurality of threaded members are respectively threadedly connected in the plurality of threaded sleeves and are used for abutting against the prestressed steel cables.

5. The deep foundation pit supporting structure according to claim 4, characterized in that: The threaded casing comprises: a transverse tube, sleeved on the outside of the prestressed steel cable, for positioning the prestressed steel cable; and The vertical tube is vertically arranged with respect to the transverse tube and communicates with the transverse tube, and is used for being threadedly connected with the threaded member.

6. The deep foundation pit supporting structure according to claim 4, characterized in that: The fixing assembly further comprises: A plurality of clamping blocks are respectively arranged in the plurality of threaded sleeves and are respectively used to cooperate with the plurality of threaded members to tighten the prestressed steel cables.

7. The deep foundation pit supporting structure according to claim 5, characterized in that: The fixing assembly further includes a corrugated pipe sleeved on the prestressed steel cable, the threaded sleeve is sleeved on the corrugated pipe through the transverse pipe, and the vertical pipe is connected to the corrugated pipe.

8. The deep foundation pit supporting structure according to any one of claims 1 to 7, characterized in that: The prestressed steel cable is a post-tensioned prestressed steel cable, and the material of the post-tensioned prestressed steel cable is a galvanized steel wire rope.

9. The deep foundation pit supporting structure according to any one of claims 1 to 7, characterized in that: The top perimeter beam comprises a plurality of post-tensioned prestressed simply supported beams which are sequentially connected end to end, and any two adjacent post-tensioned prestressed simply supported beams support each other.

10. A deep foundation pit support method, characterized in that: The deep foundation pit supporting structure according to any one of claims 1 to 9 comprises: Casting of top beams; Inserting prestressed steel cables into the prestressed channel and tensioning each prestressed steel cable one by one; Fixing both ends of the prestressed steel cables after tensioning; A plurality of fixing points are arranged at intervals in the extending direction of the prestressed steel cable, and the prestressed steel cable is fixed at each fixing point to form the deep foundation pit support structure.

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