Deep foundation pit geopolymer concrete prestress tension rib support pile component suitable for corrosive environment and manufacturing method

Abstract

The invention belongs to the technical field of deep foundation pit engineering in corrosive environments, and discloses a deep foundation pit geopolymer concrete prestress tension rib support pile component suitable for a corrosive environment and a manufacturing method. The geopolymer concrete prestressed tension rib support pile component for the deep foundation pit comprises a plurality of main ribs which are vertically arranged and are distributed in a circumferential mode, and a plurality of reinforcing steel bars which are arranged in a circumferential mode are arranged on the main ribs. The annular horizontal ribs are arranged on the opposite sides of the main ribs; the stirrups are arranged on the sides, away from the annular horizontal ribs, of the main ribs; and the geopolymer concrete is filled in a reinforcement cage formed by the main reinforcements, the annular horizontal reinforcements and the stirrups in a surrounding manner. The geopolymer concrete pouring space is formed by arranging the main reinforcements, the annular horizontal reinforcements and the stirrups which are matched with one another in a combined mode, and construction is easier and more convenient; the geopolymer concrete is applied, so that the cost is lower, and higher corrosion resistance and deformation resistance can be provided.

Description

Technical Field

[0001] The invention belongs to the technical field of deep foundation pit engineering in corrosive environments, and in particular relates to a deep foundation pit geopolymer concrete prestressed tensioned bar supporting pile component suitable for use in corrosive environments and a manufacturing method thereof. Background Art

[0002] With the continuous development of urban construction, the development and utilization of underground space has received more and more attention. As an important means of underground space development, the safety and stability of deep foundation pit engineering are crucial to the smooth progress of the entire project. Piles, as an important part of the deep foundation pit support structure, can effectively improve the bearing capacity of the soil, reduce the horizontal displacement and settlement of the soil around the foundation pit, and reduce the impact of groundwater on the foundation pit, thereby ensuring the safety and stability of the foundation pit.

[0003] In complex environments, existing traditional support piles have problems such as difficult construction, high life cycle cost, poor corrosion resistance, and serious environmental pollution. Secondly, since the size and shape of support piles are usually fixed, difficulties will also be encountered when dealing with complex geological structures or irregular foundation pit shapes.

[0004] Therefore, how to improve the corrosion resistance of support piles, reduce the cost of support piles, and reduce construction difficulty while ensuring the safety of foundation pits is an important challenge currently facing deep foundation pit projects.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art in making support pile components, such as great difficulty in construction, high construction cost and weak corrosion resistance of the components. The purpose is to provide a deep foundation pit geopolymer concrete prestressed tensioned reinforcement support pile component suitable for corrosive environments, which has simple construction, low construction cost and strong corrosion resistance.

[0007] Another object of the present invention is to provide a method for manufacturing the above-mentioned deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile component.

[0008] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile member suitable for corrosive environment, characterized in that it includes:

[0009] Main reinforcement, wherein a plurality of the main reinforcements are vertically arranged and arranged in a circle;

[0010] An annular horizontal rib, wherein a plurality of the annular horizontal ribs are provided, and the plurality of the annular horizontal ribs are arranged at intervals along an axial direction parallel to the main ribs; the annular horizontal ribs are provided on a side facing the plurality of the main ribs;

[0011] Stirrups, the stirrups are arranged on a side of the main reinforcement away from the annular horizontal reinforcement;

[0012] Geopolymer concrete, the geopolymer concrete is filled in a reinforcement cage formed by the main reinforcement, the annular horizontal reinforcement and the stirrups;

[0013] Wherein, the axis of the reinforcement cage is parallel to the axis of the main reinforcement.

[0014] According to one embodiment of the present invention, the stirrups are arranged in parallel with the annular horizontal ribs;

[0015] The stirrups are provided in plurality, and the stirrups are arranged at intervals along an axial direction parallel to the main reinforcement;

[0016] Along the axial direction perpendicular to the main reinforcement, the projections of the stirrups and the annular horizontal reinforcement overlap or are arranged at intervals.

[0017] According to an embodiment of the present invention, the stirrups are spirally wound around a side of the main reinforcement away from the annular horizontal reinforcement.

[0018] According to one embodiment of the present invention, the method further comprises:

[0019] A bearing plate, the bearing plate is arranged in the rib cage, the bearing plate is connected to the main rib and / or the annular horizontal rib; a plurality of bearing plates are provided, the plurality of bearing plates are arranged at intervals of 1m in a direction parallel to the axis of the main rib, and the bearing plate with the lowest horizontal height among the plurality of bearing plates is 2m away from the bottom of the rib cage; a first channel is provided on the bearing plate that penetrates the bearing plate;

[0020] A tensioning pad, the tensioning pad being arranged on a side of the reinforcement cage away from the bearing plate;

[0021] A fixing plate, the fixing plate is arranged in the reinforcement cage, the bearing plate is connected to the main reinforcement and / or the annular horizontal reinforcement; a plurality of fixing plates are provided, the plurality of fixing plates are arranged at intervals of 1m in the axial direction parallel to the main reinforcement, and the fixing plate with the highest horizontal height among the plurality of fixing plates is 0.1m away from the tension pad; a second channel is provided on the fixing plate, and the second channel coincides with the first channel in the projection along the axial direction parallel to the main reinforcement;

[0022] A tensioning bar, one end of which is connected to an end of the bearing plate away from the fixing plate through an anchor sleeve, passes through the first hole and the second hole, and the other end of which is connected to an end of the tensioning pad close to the fixing plate.

[0023] According to one embodiment of the present invention, the thickness of the bearing plate and / or the fixing plate is 20 mm;

[0024] The bearing plate and / or the fixing plate are arc-shaped plate structural members made of FRP material.

[0025] According to one embodiment of the present invention, three carrying plates and / or three fixing plates are provided.

[0026] According to one embodiment of the present invention, the main reinforcement, and / or the annular horizontal reinforcement, and / or the tension reinforcement are all FRP reinforcements;

[0027] The stirrups are CFRP bars.

[0028] According to one embodiment of the present invention, the geopolymer concrete comprises: 900-940 parts of fly ash, 200-220 parts of slag, 390-420 parts of quartz sand, 350-510 parts of alkali activator, and 80-140 parts of water per cubic meter.

[0029] The present invention also provides a method for manufacturing a deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile component suitable for a corrosive environment, which is used to manufacture the above-mentioned deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile component suitable for a corrosive environment, comprising the steps of:

[0030] S1. The reinforcement cage is formed by tying the main reinforcement, circular horizontal reinforcement, load-bearing plate, fixed plate, tension reinforcement and stirrups;

[0031] S2, pouring geopolymer concrete in the reinforcement cage;

[0032] S3. Cover the cast reinforcement cage with geotextile or straw mat, perform regular maintenance, and complete the casting of the supporting pile body;

[0033] S4, crown beam construction: after the maintenance of the supporting piles is completed, the floating slurry on the top of the supporting piles is chiseled off, the pile heads are cleaned, the tension pads are embedded on the top, concrete is poured, and water is poured for maintenance;

[0034] S5. Tensioning the tensioning bars: Use a single-gun jack to tension each bar in two steps, use a single-gun jack to tension each bar to 100KN, and then tension the entire bar to 140KN.

[0035] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0036] 1) In the present invention, the main reinforcement, the annular horizontal reinforcement and the stirrups are arranged to cooperate with each other to form a pouring space for geopolymer concrete, so that the construction is simpler; the application of geopolymer concrete not only has lower cost, but also can provide stronger corrosion resistance and deformation resistance;

[0037] 2) The manufacturing method of the present invention helps to ensure uniform distribution of force during the tensioning process, and avoids problems such as eccentric stress and local deformation of the structure caused by improper tensioning sequence or uneven tensioning force. Symmetrical tensioning can make the prestress of each tensioning bar relatively balanced, maintaining the force balance of the structure; staged tensioning can more accurately control the application process of prestressing. At the end of the final tensioning, multiple tensioning bars are in the same (or close) tensioning state, allowing the structure to gradually adapt to the change of prestress, further ensuring the overall quality and stability of the support pile components after the prestressing is applied, and comprehensively improving the structural strength of the pile body and the ability of the pile body to resist deformation.

[0038] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0040] Figure 1 It is a schematic diagram of the structure of a reinforcement cage formed by main reinforcement, annular horizontal reinforcement and stirrups in an embodiment of the present invention;

[0041] Figure 2 for Figure 1 Schematic diagram of the structure under the cross-sectional view at AA in the middle;

[0042] Figure 3 It is a structural schematic diagram of the tensioning reinforcement in a fixed state in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the structure of the bearing plate used for 1.2m diameter piles;

[0044] Figure 5 This is a schematic diagram of the structure of the fixing plate used for 1.2m diameter piles;

[0045] Figure 6 This is a schematic diagram of the structure of the tension pad used for 1.2m diameter piles;

[0046] Figure 7 Schematic diagram of the connection between the tensioning reinforcement and the bearing plate in an embodiment of the present invention.

[0047] Description of the main components in the figure:

[0048] 1. Main reinforcement; 2. Circular horizontal reinforcement; 3. Stirrups; 4. Geopolymer concrete; 5. Load-bearing plate; 51. Rib plate; 6. Fixed plate; 7. Tensioning reinforcement; 8. Anchor sleeve; 9. Tensioning pad.

[0049] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0051] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] like Figures 1 to 7 As shown, the present invention discloses a deep foundation pit geopolymer concrete prestressed FRP tendon supporting pile member suitable for use in a corrosive environment, comprising:

[0054] A main reinforcement 1, wherein the main reinforcement 1 is vertically arranged; a plurality of the main reinforcements 1 are arranged, and the plurality of the main reinforcements 1 are arranged circumferentially (forming a columnar structure);

[0055] The annular horizontal rib 2 is a structural member in the shape of a circular ring; a plurality of the annular horizontal ribs 2 are provided, and the plurality of the annular horizontal ribs 2 are arranged at intervals along the axial direction parallel to the main ribs 1; the annular horizontal ribs 2 are arranged on the side facing the plurality of the main ribs 1 (the inner side of the main ribs 1); along the axial direction parallel to the main ribs 1, the projection of the annular horizontal rib 2 is circular, and the diameter of the projection of the annular horizontal rib 2 is less than or equal to the inner diameter of the columnar structure formed by the plurality of the main ribs 1.

[0056] Stirrups 3, the stirrups 3 are arranged on a side of the main reinforcement 1 away from the annular horizontal reinforcement 2 (outside the main reinforcement 1);

[0057] Geopolymer concrete 4, the geopolymer concrete 4 is filled in a reinforcement cage formed by the main reinforcement 1, the annular horizontal reinforcement 2 and the stirrups 3;

[0058] Wherein, the axis of the reinforcement cage is parallel to the axis of the main reinforcement 1;

[0059] The annular horizontal reinforcement 2 is connected to the main reinforcement 1, and the annular horizontal reinforcement 2 and / or the stirrups 3 are connected to the main reinforcement 1 through steel wires (such as carbon steel, alloy steel, etc.).

[0060] Multiple main bars are arranged vertically to jointly bear the vertical loads generated by lateral soil pressure and upper covering soil during deep foundation pit excavation, providing basic vertical support for the entire support pile, ensuring that the support pile can stand stably underground when subjected to stress, maintaining the vertical stability of the structure and preventing settlement and other problems; the circumferential arrangement allows the stress to be more evenly distributed on each main bar when subjected to external loads, avoiding excessive local stress and causing premature damage to a certain main bar, improving the ability of the entire structure to resist external force damage, and ensuring the reliability of the overall stress performance of the support pile component;

[0061] Multiple annular horizontal bars are arranged at intervals along the axis of the main reinforcement and located on the inner side of the main reinforcement. The annular horizontal bars can limit the horizontal displacement of the main reinforcement, keep it in a relatively fixed position, enhance the regularity of the main reinforcement arrangement, and thus improve the integrity of the entire reinforcement cage. During construction and subsequent force-bearing processes, even if disturbed by external forces or changes in internal forces, the main reinforcement is not prone to deflection or dispersion, ensuring the stability of the support pile structure shape; in a deep foundation pit environment, the support pile will be subject to lateral earth pressure from the side wall of the foundation pit. The annular horizontal bars can help to transfer and disperse the lateral force more evenly to each main reinforcement through the restraining effect on the main reinforcement, and work with the main reinforcement to resist lateral deformation, reduce the bending, twisting and other deformation of the support pile under lateral pressure, improve the lateral support effect of the support pile on the deep foundation pit, and ensure the stability of the soil and environment around the foundation pit.

[0062] Stirrups constrain the main reinforcement from the outside and cooperate with the inner annular horizontal reinforcement to form an all-round fixing effect on the main reinforcement, further enhancing the stability of the main reinforcement in all directions, limiting local bulging, bending and other deformations of the main reinforcement when subjected to force, ensuring that the main reinforcement can maintain its mechanical properties under various stress states such as tension and compression, and improving the bearing capacity and deformation resistance of the entire reinforcement cage; when the supporting piles are subjected to complex external forces, such as additional shear forces caused by uneven lateral earth pressure and possible groundwater seepage, stirrups can effectively improve the shear strength of the entire component, prevent cracks and damage in the structure due to excessive shear force, and ensure the structural safety of the supporting piles in the complex stress environment of deep foundation pits.

[0063] Geopolymer concrete wraps the main reinforcement, annular horizontal reinforcement and stirrups. On the one hand, it can isolate the external corrosive media (such as corrosive components in the soil, groundwater, etc.) from contact with the reinforcement components, play a good anti-corrosion protection role for the internal reinforcement, and extend the service life of the support piles. It is especially suitable for deep foundation pit projects in corrosive environments; on the other hand, geopolymer concrete itself has certain mechanical properties and can bear force together with the internal steel bars. When subjected to external forces such as vertical loads and lateral pressures, the concrete bears the pressure and the bars bear the tension. The two work together to give full play to their respective material advantages and improve the comprehensive bearing capacity and structural stability of the entire support pile component; the filled geopolymer concrete makes the entire component a whole, fills the gaps between the steel bar components, avoids weak spots, improves the overall density and sealing of the support pile, and also plays a positive role in preventing groundwater leakage and maintaining the hydraulic balance inside and outside the foundation pit, further ensuring the safety and stability of the deep foundation pit during construction and use.

[0064] The force transmission direction of each component is carried out along a predetermined and reasonable path, avoiding additional eccentric force, torsion and other adverse stress conditions caused by inconsistent axes, so that the component can transfer and distribute the force among the internal components in the most effective way when it is subjected to vertical force or lateral force, maximize the mechanical properties of each component, and maintain the stability and reliable support function of the entire support pile in the deep foundation pit environment.

[0065] In addition, geopolymer concrete, as a green building material, has the characteristics of early strength and fast hardening, and has excellent compression, tension and durability. The support piles using geopolymer concrete have high corrosion resistance and deformation resistance, which can effectively protect the soil and buildings around the foundation pit and improve the stability and safety of the foundation pit.

[0066] That is, in the present invention, by arranging mutually coordinated main reinforcement 1, annular horizontal reinforcement 2 and stirrups 3, a pouring space of geopolymer concrete 4 is formed in combination, so that the construction is made simpler while ensuring the construction quality; the application of geopolymer concrete 4 not only has lower cost, but also can provide stronger corrosion resistance and deformation resistance.

[0067] Please see attached Figure 1 and attached Figure 2 In a specific implementation of the present embodiment, one stirrup 3 is provided, and the stirrup 3 is spirally wound around a side of the main reinforcement 1 away from the annular horizontal reinforcement 2 .

[0068] In a specific implementation of this embodiment, the stirrups 3 are in a spiral structure, and the pitch (the axial distance between corresponding points of two adjacent circles on the mid-diameter) is less than or equal to the distance between adjacent annular horizontal ribs 2.

[0069] Only one spiral stirrup is set around the outside of the main reinforcement, which can provide continuous and all-round restraint. When subjected to lateral pressure or tension, the main reinforcement is strengthened by the tightening force of the spiral stirrup, and its stability is not easy to deform or bulge locally, thereby improving the deformation resistance of the entire support pile component. The constraint of the spiral stirrup makes the stress distribution of the main reinforcement more uniform during the force process. When the component is subjected to external loads, the spiral stirrup will transfer the force to the main reinforcement evenly, avoiding stress concentration. This is because the contact between the spiral stirrup and the main reinforcement is continuous, and the force can be evenly distributed to each section of the main reinforcement along the spiral line, which improves the bearing efficiency of the main reinforcement and enables the entire support pile to better withstand the complex loads in the deep foundation pit environment. Compared with setting multiple single-leg stirrups, the arrangement of a single spiral stirrup is simpler in construction. The number of stirrups and the installation steps are reduced, which reduces the construction difficulty and workload, helps to improve construction efficiency, and also reduces the possibility of quality problems caused by improper installation of stirrups. The pitch of the spiral stirrups is less than or equal to the distance between adjacent annular horizontal bars, ensuring that the stirrups and annular horizontal bars can work together. This arrangement allows the restraint to be evenly distributed in the vertical direction of the support pile. The annular horizontal bars mainly restrain the main bars in the horizontal direction, while the spiral stirrups provide restraint in the circumferential direction. The reasonable spacing between the two allows the restraint forces in different directions to complement each other, forming a tighter and more efficient restraint system, effectively improving the integrity and stability of the entire reinforcement cage. In a deep foundation pit environment, the support piles may be subjected to large shear forces, such as changes in groundwater levels and uneven lateral deformation of the soil. The reasonable pitch setting of the spiral stirrups, in conjunction with the annular horizontal bars, can enhance the shear resistance of the components. When the component is subjected to shear force, the spiral stirrups can effectively prevent the relative sliding between the main bars and transfer the shear force to the entire structure. At the same time, the annular horizontal bars can also play an auxiliary role in shear resistance, thereby improving the ability of the support piles to resist shear failure.

[0070] That is, in the present invention, the stirrups 3 are provided to provide circumferential constraints on the main reinforcement 1 , thereby ensuring the stability and reliability of the reinforcement cage structure formed therein, which has a positive significance for the subsequent stable pouring of the geopolymer concrete 4 .

[0071] In a specific implementation of this embodiment, the stirrup 3 is arranged in parallel with the annular horizontal rib 2; the annular horizontal rib 2 is arranged on a side of the main rib 1 away from the annular horizontal rib 2 (outside of the main rib 1);

[0072] The stirrups 3 are provided in plurality, and the stirrups 3 are arranged in a direction parallel to the axis of the main reinforcement 1;

[0073] Along the axial direction perpendicular to the main reinforcement 1 , the projection of the stirrup 3 coincides with the projection of the annular horizontal reinforcement 2 .

[0074] In another specific implementation of this embodiment, the stirrups 3 are arranged in parallel with the annular horizontal ribs 2; the annular horizontal ribs 2 are arranged on a side of the main ribs 1 away from the annular horizontal ribs 2 (outside of the main ribs 1);

[0075] The stirrups 3 are provided in plurality, and the stirrups 3 are arranged in a direction parallel to the axis of the main reinforcement 1;

[0076] Along the axial direction perpendicular to the main reinforcement 1 , the projection of the stirrup 3 and the projection of the annular horizontal reinforcement 2 are arranged at intervals.

[0077] In the present invention, by arranging the stirrups 3, the stirrups 3 correspond to or are interlaced with the annular horizontal reinforcements 2, so that the formed reinforcement cage has higher sealing properties and stronger ability to disperse stress, which has positive significance for the subsequent pouring of geopolymer concrete 4 to form a denser component and the structural stability of the component.

[0078] Please see attached Figure 1 To Attachment Figure 3 , Attachment Figure 7 In a specific implementation of this embodiment, the prestressed tensioned reinforcement supporting pile component of a deep foundation pit geopolymer concrete suitable for a corrosive environment further includes:

[0079] A bearing plate 5, the bearing plate 5 is an arc-shaped structural plate, along the axial direction parallel to the main reinforcement 1, the projection of the bearing plate 5 at least partially coincides with the circular projection of the columnar structure formed by the plurality of main reinforcements 1; along the axial direction parallel to the main reinforcement 1, the projection of the bearing plate 5 is smaller than the circular projection of the columnar structure formed by the plurality of main reinforcements 1; the bearing plate 5 is arranged in the reinforcement cage, and the bearing plate 5 is connected to the main reinforcement 1 and / or the annular horizontal reinforcement 2 (for example, welded or anchored); a plurality of bearing plates 5 are provided, and the plurality of bearing plates 5 are arranged at intervals (1m) along the axial direction parallel to the main reinforcement 1, and the bearing plate 5 with the lowest horizontal height among the plurality of bearing plates 5 is 2m away from the bottom of the reinforcement cage; a first channel is provided on the bearing plate 5, which penetrates the thickness direction (in the axial direction parallel to the main reinforcement 1);

[0080] A tensioning pad 9, wherein the tensioning pad 9 is arranged on a side of the reinforcement cage away from the fixing plate 6;

[0081] A fixed plate 6, wherein the fixed plate 6 is an arc-shaped structural plate, and along the axial direction parallel to the main reinforcement 1, the projection of the fixed plate 6 at least partially coincides with the circular projection of the columnar structure formed by the plurality of main reinforcements 1; along the axial direction parallel to the main reinforcement 1, the projection of the fixed plate 6 is smaller than the circular projection of the columnar structure formed by the plurality of main reinforcements 1; the fixed plate 6 is arranged in the reinforcement cage, and the fixed plate 6 is connected to the main reinforcement 1 and / or the annular horizontal reinforcement 2; a plurality of fixed plates 6 are provided, and the plurality of fixed plates 6 are arranged at intervals (1m) along the axial direction parallel to the main reinforcement 1, and the fixed plate 6 with the highest horizontal height among the plurality of fixed plates 6 is 0.1m away from the tension pad 9; a second channel is provided on the fixed plate 6, which passes through the thickness direction (parallel to the axial direction of the main reinforcement 1), and the second channel coincides with the first channel along the projection in the axial direction parallel to the main reinforcement 1;

[0082] A tensioning bar 7, one end of which is connected to the end of the bearing plate 5 away from the fixing plate 6 through an anchor sleeve 8, passes through the first channel and the second channel, and the other end of the tensioning bar 7 is connected to the end of the tensioning pad 9 close to the fixing plate 6; before the tensioning bar 7 is tensioned, the outer diameter of the tensioning bar 7 is less than or equal to the aperture of the first channel and the second channel.

[0083] In the present invention, by providing the tensioning bars 7, prestressed support is provided for the pile body, which can effectively improve the ability of the pile body to resist external forces, and has a positive significance for improving the structural strength and deformation resistance of the pile body.

[0084] Please see attached Figure 3 and attached Figure 6 In a specific implementation of this embodiment, the tensioning pad 9 is a square plate.

[0085] In a specific implementation of this embodiment, a rubber gasket (not shown) is provided inside the first hole and / or the second hole. The friction between the tensioning bar 7 and the bearing plate 5 and the fixing plate 6 is reduced by providing the rubber gasket.

[0086] In a specific implementation of this embodiment, a plurality of first channels are arranged on the bearing plate 5, and a plurality of second channels are arranged on the fixing plate 6 corresponding to the first channels; accordingly, a plurality of tensioning bars 7 are arranged corresponding to the channels (the first channels and the second channels), and the plurality of tensioning bars 7 are arranged in parallel.

[0087] Please see attached Figure 3 and attached Figure 7In a specific implementation of this embodiment, the tensioning bar 7 needs to be connected to the bearing plate 5 by an anchor sleeve 8 to prevent the tensioning bar 7 from falling out;

[0088] The anchor sleeve 8 is a clamping sleeve fixed at the bottom end of the tensioning bar 7, which anchors the tensioning bar 7 to prevent it from being dislocated (the specific structure of the anchor sleeve is a conventional setting in the art, which is not an improvement or innovation of the present application and will not be described in detail here);

[0089] Specifically, the tensioning bar 7 passes through the bearing plate 5, and the anchor sleeve 8 is used to cover the tensioning bar 7 to prevent the tensioning bar 7 from deviating upward (toward the direction close to the fixing plate 6) when the prestress is stretched.

[0090] In a specific implementation of this embodiment, the tensioning bar 7 and the fixing plate 6 are also connected via the anchoring sleeve 8 .

[0091] In a specific implementation of this embodiment, the thickness of the carrying plate 5 and / or the fixing plate 6 is 20 mm.

[0092] In a specific implementation of this embodiment, the bearing plate 5 and / or the fixing plate 6 are arc-shaped plate structural members made of FRP material.

[0093] By providing the arc-shaped bearing plate 5 and the fixing plate 6 and pre-tightening the tensioning bars 7 to provide lateral pre-tightening force for the supporting pile body, the structural strength and support reliability of the supporting pile itself are improved.

[0094] Please see attached Figure 3 and attached Figure 4 In a specific implementation of this embodiment, the bearing plate 5 is a fan-ring-shaped structural member;

[0095] The outer arc edge of the bearing plate 5 coincides with the center of the inner arc edge;

[0096] The outer arc edge of the bearing plate 5 is connected to the main rib 1 and / or the annular horizontal rib 2 .

[0097] In a specific implementation of this embodiment, corresponding to a pile with a diameter of 1.2 m, the thickness of the bearing plate 5 is 1 mm, or 2 mm, or 3 mm;

[0098] The central angle of the supporting plate 5 is 50° to 100°.

[0099] Please see attached Figure 4 In a specific implementation of this embodiment, a rib 51 is provided on a side of the carrying plate 5 away from the fixing plate 6;

[0100] The rib plate 51 is a protruding block protruding from the supporting plate 5 and extending toward a side away from the fixing plate 6 .

[0101] The ribs 51 are provided to enhance the bearing capacity and stability of the bearing plate 5. When subjected to external forces such as pressure, bending, and twisting, the ribs can effectively disperse these forces and transfer them to the overall structure, thereby protecting the main structure from damage. This not only improves the firmness of the bearing plate 51 structure, but also improves the reliability of the bearing plate 51 installed in the component.

[0102] It should be noted that the appendix to this application Figure 4 To Attachment Figure 6 The description is based on a pile with a diameter of 1.2m, which is only for the purpose of specific example, and does not limit the actual diameter of the pile.

[0103] Please see attached Figure 3 and attached Figure 5 In a specific implementation of this embodiment, the fixing plate 6 is an arc-shaped structural member;

[0104] The inner edge of the fixing plate 6 is spaced a certain distance from the axis of the column (rib cage), and along the diameter direction of the column (rib cage), the distance between the arc edge of the fixing plate 6 and its inner edge is smaller than the radius of the column (rib cage);

[0105] The arc edge of the fixing plate 6 is connected to the main rib 1 and / or the annular horizontal rib 2 .

[0106] In a specific implementation of this embodiment, the central angle corresponding to the fixing plate 6 is 125°.

[0107] Please see attached Figure 3 In a specific implementation of this embodiment, three of the carrying plates 5 and / or the fixing plates 6 are provided.

[0108] In a specific implementation of this embodiment, the main reinforcement 1, and / or the annular horizontal reinforcement 2, and / or the tension reinforcement 7 are all FRP (Fiber Reinforced Polymer / Plastic) reinforcements; the main reinforcement 1 is an FRP reinforcement, which means that the main reinforcement 1 is a reinforcement-type structural member made of FRP material;

[0109] The stirrups 3 are CFRP (Carbon Fiber Reinforced Polymer / Plastic) bars.

[0110] In a specific implementation of this embodiment, the main reinforcement 1, and / or the annular horizontal reinforcement 2, and / or the tensioning reinforcement 7 are CFRP (Carbon Fiber Reinforced Polymer / Plastic) reinforcements or GFRP (Glass Fiber Reinforced Polymer / Plastic) reinforcements or BFRP (Basalt Fiber Reinforced Polymer / Plastic) reinforcements or AFRP (Aramid Fiber Reinforced Polymer / Plastic) reinforcements.

[0111] The tensioning bars made of FRP material have the characteristics of light weight, high strength, good corrosion resistance and high tensile strength. Applying prestress to the tensioning bars can effectively reduce the tensile stress on the pile body, increase the rigidity of the pile body, enhance the crack resistance of the pile body, greatly improve the stability of the pile body, improve the durability of the pile body during its service period and reduce the cost of the entire life cycle of the structure.

[0112] In a specific implementation of this embodiment, the geopolymer concrete 4 includes: 900-940 parts of fly ash, 200-220 parts of slag, 390-420 parts of quartz sand, 350-510 parts of alkali activator, and 80-140 parts of water per cubic meter.

[0113] The method for making the geopolymer concrete 4 comprises the following steps:

[0114] Step 1, preparing corresponding amounts of fly ash, slag, quartz sand, alkali activator and water;

[0115] Step 2: Take fly ash, quartz sand and slag according to the proportion (the aforementioned proportion), mix them evenly, and obtain a dry mix A;

[0116] Step 3, taking an alkali activator and water in proportion, and mixing them evenly to obtain a mixture B;

[0117] Step 4, adding mixture B to dry mix A in two portions (adding half first and half later), stirring evenly, to obtain geopolymer concrete 4;

[0118] If it is added all at once, the alkali-induced reaction may be incomplete and the quality of the obtained concrete may be insufficient; therefore, the present application uses a method of adding it in two times to overcome the above problem.

[0119] The present invention also provides a method for manufacturing the above-mentioned deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile component suitable for a corrosive environment, comprising the steps of:

[0120] S1. The main reinforcement, circular horizontal reinforcement, load-bearing plate, fixed plate, tension reinforcement and stirrups are tied together (by steel wire) to form a reinforcement cage;

[0121] S2, pouring geopolymer concrete in the reinforcement cage;

[0122] S3. Cover the cast reinforcement cage with geotextile or straw mat, perform regular maintenance, and complete the casting of the supporting pile body;

[0123] S4, crown beam construction: after the maintenance of the supporting piles is completed, the floating slurry on the top of the supporting piles is chiseled off, the pile heads are cleaned, the tensioning pads are embedded on the tops (previously the tensioning bars are in an untensioned state), concrete is poured, and water is poured for maintenance;

[0124] S5. Tensioning the tensioning bars. The anchors shall be OVM series anchors. The tensioning force of the tensioning machine shall not be less than 1000KN. Calibration shall be carried out before tensioning to determine the pressure value. The tensioning bars shall be tensioned symmetrically along the channels. Single-gun jacks shall be used to tension each bar in two steps. Single-gun jacks shall be used to tension each bar to 100KN, and then the entire bar shall be tensioned to 140KN.

[0125] It should be pointed out that the "symmetrical tensioning according to the holes" means that when tensioning (prestressing) the tensioning bars, the tensioning sequence and position symmetry must be ensured. If the holes are symmetrically distributed left and right (or up and down), then during the tensioning process, the tensioning bars in the holes at these symmetrical positions should be tensioned simultaneously or in a symmetrical order.

[0126] In the present invention, the above scheme helps to ensure uniform distribution of force during the tensioning process, and avoids problems such as eccentric stress and local deformation of the structure caused by improper tensioning sequence or uneven tensioning force. Symmetrical tensioning can make the prestress of each tensioning bar relatively balanced, maintaining the force balance of the structure; staged tensioning can more accurately control the application process of prestressing. At the end of the final tensioning, multiple tensioning bars are in the same (or close) tensioning state, making the maximum use of the stretching degree of the tensioning bars, allowing the structure to gradually adapt to the change of prestress, further ensuring the overall quality and stability of the support pile components after the prestressing is applied, and comprehensively improving the structural strength of the pile body and the ability of the pile body to resist deformation.

[0127] In a specific implementation of this embodiment, a method for manufacturing a deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile member suitable for a corrosive environment comprises the following steps:

[0128] According to the construction drawing, a reinforcement cage consisting of main reinforcement 1, annular horizontal reinforcement 2, stirrups 3, bearing plates 5, fixing plates 6 and tensioning reinforcement 7 is tied, the stirrups 3 are made of CFRP material, and the other components are all made of GFRP material;

[0129] According to the mass, 920 parts of fly ash, 230 parts of slag, and 400 parts of quartz sand were weighed and mixed and stirred evenly to obtain a dry mix A;

[0130] Weigh 430 parts of alkali-raising agent and 80 parts of water by mass, mix well, and obtain mixture B;

[0131] Add mixture B to dry mix A twice, mix evenly, obtain geopolymer concrete 4 and pour it into the reinforcement cage;

[0132] Cover the poured reinforcement cage with geotextile or straw mat, perform regular maintenance, and complete the pouring of the pile body;

[0133] Crown beam construction: After the maintenance of the supporting piles is completed, the floating slurry on the top of the supporting piles is chiseled off, the pile heads are cleaned, the tension pads are embedded on the top, concrete is poured, and water is poured for maintenance;

[0134] The tensioning bars 7 are tensioned, and the anchors are of OVM series. The tensioning bars are tensioned symmetrically along the holes to complete the production of the prestressed tensioning bar supporting pile components of the deep foundation pit geopolymer concrete suitable for the corrosive environment.

[0135] In another specific implementation of this embodiment, a method for manufacturing a deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile member suitable for a corrosive environment comprises the following steps:

[0136] According to the construction drawing, a reinforcement cage consisting of main reinforcement 1, annular horizontal reinforcement 2, stirrups 3, bearing plates 5, fixing plates 6 and tensioning reinforcement 7 is tied, the stirrups are made of CFRP material, and the remaining components are made of AFRP material;

[0137] According to the mass, 930 parts of fly ash, 230 parts of slag, and 410 parts of quartz sand were weighed and mixed evenly to obtain a dry mix A;

[0138] Weigh 350 parts of alkali-raising agent and 140 parts of water by mass, mix well, and obtain mixture B;

[0139] Add mixture B to dry mix A twice, mix evenly, obtain geopolymer concrete 4 and pour it into the reinforcement cage;

[0140] Cover the poured reinforcement cage with geotextile or straw mat, perform regular maintenance, and complete the pouring of the pile body;

[0141] Crown beam construction: After the maintenance of the supporting piles is completed, the floating slurry on the top of the supporting piles is chiseled off, the pile heads are cleaned, the tension pads are embedded on the top, concrete is poured, and water is poured for maintenance;

[0142] The tensioning bars 7 are tensioned, and the anchors are of OVM series. The tensioning bars are tensioned symmetrically along the holes to complete the production of the prestressed tensioning bar supporting pile components of the deep foundation pit geopolymer concrete suitable for the corrosive environment.

[0143] In another specific embodiment of the present application, a method for manufacturing a deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile member suitable for a corrosive environment comprises the following steps:

[0144] According to the construction drawing, a reinforcement cage consisting of main reinforcement 1, annular horizontal reinforcement 2, stirrups 3, bearing plates 5, fixing plates 6 and tensioning reinforcement 7 is tied; the stirrups 3 are made of CFRP material, and the remaining components are made of BFRP material;

[0145] Weigh 940 parts of fly ash, 240 parts of slag, and 410 parts of quartz sand according to mass, mix and stir evenly to obtain a dry mix A;

[0146] Weigh 440 parts of alkali-raising agent and 80 parts of water by weight, mix well, and obtain mixture B;

[0147] Add mixture B to dry mix A twice, mix evenly, obtain geopolymer concrete 4 and pour it into the reinforcement cage;

[0148] Cover the poured reinforcement cage with geotextile or straw mat, perform regular maintenance, and complete the pouring of the pile body;

[0149] Crown beam construction: After the maintenance of the supporting piles is completed, the floating slurry on the top of the supporting piles is chiseled off, the pile heads are cleaned, the tension pads are embedded on the top, concrete is poured, and water is poured for maintenance;

[0150] The tensioning bars 7 are tensioned, and the anchors are of OVM series. The tensioning bars are tensioned symmetrically along the holes to complete the production of the prestressed tensioning bar supporting pile components of the deep foundation pit geopolymer concrete suitable for the corrosive environment.

[0151] In another specific implementation of this embodiment, a method for manufacturing a deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile member suitable for a corrosive environment comprises the following steps:

[0152] According to the construction drawing, a reinforcement cage consisting of main reinforcement 1, annular horizontal reinforcement 2, stirrups 3, bearing plates 5, fixing plates 6 and tensioning reinforcement 7 is tied, and the above components are all made of CFRP material;

[0153] Weigh 900 parts of fly ash, 220 parts of slag, and 390 parts of quartz sand according to mass, mix and stir evenly to obtain a dry mix A;

[0154] Weigh 420 parts of alkali-raising agent and 110 parts of water by mass, mix well, and obtain mixture B;

[0155] Add mixture B to dry mix A twice, mix evenly, obtain geopolymer concrete 4 and pour it into the reinforcement cage;

[0156] Cover the poured reinforcement cage with geotextile or straw mat, perform regular maintenance, and complete the pouring of the pile body;

[0157] Crown beam construction: After the maintenance of the supporting piles is completed, the floating slurry on the top of the supporting piles is chiseled off, the pile heads are cleaned, the tension pads are embedded on the top, concrete is poured, and water is poured for maintenance;

[0158] The tensioning bars 7 are tensioned, and the anchors are of OVM series. The tensioning bars are tensioned symmetrically along the holes to complete the production of the prestressed tensioning bar supporting pile components of the deep foundation pit geopolymer concrete suitable for the corrosive environment.

[0159] The core mechanism of the deep foundation pit geopolymer concrete prestressed tensioned reinforcement support pile component proposed by the present invention, which is suitable for corrosive environments, is to control the deformation of the pile body through prestress to achieve load balance. Compared with ordinary support piles, the support stability is better and the deformation is smaller. It is suitable for foundation pits in geological conditions such as fill, clay, silt, sand and gravel soil, when the excavation line is close to the land red line, the foundation pit is deep, there are building basements, underground structures (subways), complex pipelines, etc. near the foundation pit, and anchor cables cannot be used, the application effect of the solution of the present application is more significant.

[0160] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A prestressed tensioned pile support component of geopolymer concrete for deep foundation pits suitable for corrosive environments, characterized in that: include: A main rib (1), wherein a plurality of the main ribs (1) are vertically arranged, and the plurality of the main ribs (1) are arranged in a circular pattern; annular horizontal ribs (2), wherein a plurality of the annular horizontal ribs (2) are provided, and the plurality of the annular horizontal ribs (2) are arranged at intervals along an axial direction parallel to the main ribs (1); the annular horizontal ribs (2) are provided on a side facing the plurality of the main ribs (1); Stirrups (3), the stirrups (3) being arranged on a side of the main reinforcement (1) away from the annular horizontal reinforcement (2); Geopolymer concrete (4), the geopolymer concrete (4) is filled in a reinforcement cage formed by the main reinforcement (1), the annular horizontal reinforcement (2) and the stirrups (3); Wherein, the axis of the reinforcement cage is parallel to the axis of the main reinforcement (1).

2. The deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile member suitable for a corrosive environment according to claim 1, characterized in that: The stirrups (3) are arranged in parallel with the annular horizontal ribs (2); A plurality of stirrups (3) are provided, and the plurality of stirrups (3) are arranged at intervals along an axial direction parallel to the main reinforcement (1); Along the axial direction perpendicular to the main reinforcement (1), the projections of the stirrups (3) and the annular horizontal reinforcement (2) are overlapped or arranged at intervals.

3. The deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile member suitable for a corrosive environment according to claim 1, characterized in that: The stirrups (3) are spirally wound around a side of the main reinforcement (1) away from the annular horizontal reinforcement (2).

4. A deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile member suitable for a corrosive environment according to claim 2 or 3, characterized in that: Also includes: A bearing plate (5), the bearing plate (5) being arranged in the reinforcement cage, the bearing plate (5) being connected to the main reinforcement (1) and / or the annular horizontal reinforcement (2); a plurality of bearing plates (5) are provided, the plurality of bearing plates (5) being arranged at intervals of 1 m in a direction parallel to the axis of the main reinforcement (1), the bearing plate (5) with the lowest horizontal height among the plurality of bearing plates (5) being 2 m away from the bottom of the reinforcement cage; a first hole penetrating the bearing plate (5) is provided on the bearing plate (5); A tensioning pad, the tensioning pad being arranged on a side of the reinforcement cage away from the bearing plate (5); A fixing plate (6), wherein the fixing plate (6) is arranged in the reinforcement cage, and the bearing plate (5) is connected to the main reinforcement (1) and / or the annular horizontal reinforcement (2); a plurality of the fixing plates (6) are provided, and the plurality of the fixing plates (6) are arranged at intervals of 1 m in the axial direction parallel to the main reinforcement (1), and the distance between the fixing plate (6) with the highest horizontal height among the plurality of the fixing plates (6) and the tension pad is 0.1 m; a second hole is provided on the fixing plate (6) which penetrates the fixing plate, and the projection of the second hole in the direction parallel to the axial line of the main reinforcement (1) coincides with the first hole; A tensioning bar (7), one end of which is connected to an end of the bearing plate (5) away from the fixing plate (6) via an anchor sleeve (8), passes through the first hole and the second hole, and the other end of the tensioning bar (7) is connected to an end of the tensioning pad close to the fixing plate (6).

5. The deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile member suitable for a corrosive environment according to claim 4, characterized in that: The thickness of the bearing plate (5) and / or the fixing plate (6) is 20 mm; The bearing plate (5) and / or the fixing plate (6) are arc-shaped plate structural parts made of FRP material.

6. The deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile member suitable for a corrosive environment according to claim 4, characterized in that: The number of the bearing plates (5) and / or the fixing plates (6) is three.

7. The deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile member suitable for use in a corrosive environment according to claim 4, characterized in that: The main reinforcement (1), and / or the annular horizontal reinforcement (2), and / or the tension reinforcement (7) are all FRP reinforcements; The stirrups (3) are CFRP bars.

8. The deep foundation pit geopolymer concrete prestressed tensioned reinforcement supporting pile member suitable for use in a corrosive environment according to claim 4, characterized in that: The geopolymer concrete (4) comprises: 900-940 parts of fly ash, 200-220 parts of slag, 390-420 parts of quartz sand, 350-510 parts of alkali activator and 80-140 parts of water per cubic meter.

9. A method for manufacturing a prestressed tensioned reinforcement supporting pile component of a deep foundation pit geopolymer concrete suitable for a corrosive environment, which is applied to manufacturing a prestressed tensioned reinforcement supporting pile component of a deep foundation pit geopolymer concrete suitable for a corrosive environment as claimed in any one of claims 1 to 8, characterized in that: Includes steps: S1. The reinforcement cage is formed by tying the main reinforcement, circular horizontal reinforcement, load-bearing plate, fixed plate, tension reinforcement and stirrups; S2, pouring geopolymer concrete in the reinforcement cage; S3. Cover the cast reinforcement cage with geotextile or straw mat, perform regular maintenance, and complete the casting of the supporting pile body; S4, crown beam construction: after the maintenance of the supporting piles is completed, the floating slurry on the top of the supporting piles is chiseled off, the pile heads are cleaned, the tension pads are embedded on the top, concrete is poured, and water is poured for maintenance; S5. Tensioning the tensioning bars: Use a single-gun jack to tension each bar in two steps, use a single-gun jack to tension each bar to 100KN, and then tension the entire bar to 140KN.

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