Intelligent adjustment of the number of limbs and pushing pieces for a foundation pit support system

Abstract

This invention belongs to the field of foundation pit support technology, specifically relating to an intelligent adjustable telescopic rod and a method for calculating the number of jacking components in a foundation pit support system. The single-limb telescopic rod of this invention includes a fixed section and a jacking section. The jacking section includes a jacking component and a compensating component. The piston and piston cylinder of the jacking component enclose a cavity for storing an intermediate medium, and this cavity is also equipped with a semiconductor cooling chip. The compensating component includes a reduction gearbox capable of torque variation. The gear at the head of the reduction gearbox meshes with a gear rack, which passes through the gearbox housing and is fixed to the jacking component, the fixed section, or the transverse support rod. The gear at the tail of the reduction gearbox meshes with a power rack, whose tip extends out of the gearbox housing and independently engages with the power end of a linear power source. This invention provides a fundamental guarantee for the integrity, stability, and operational safety of the foundation pit soil, while simultaneously possessing the advantages of high construction flexibility, low turnover cost, and low noise.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of foundation pit support, and particularly relates to an intelligent adjustment limb rod for a foundation pit support system and a number of pushing pieces calculation method. BACKGROUND

[0002] The foundation pit support is an extremely important link in the construction process of buildings and structures; it is related to the economic efficiency of the entire construction, and more related to the safety of the construction. The foundation pit support currently usually includes a concrete support structure and a steel support structure, wherein: the traditional concrete support structure cannot be reused, is not conducive to reducing carbon emissions, and has poor economic benefits; and the traditional steel support structure, although it can be reused, has weak bearing potential and cannot reliably cope with the changes in the environment around the foundation pit and the properties of the supporting soil during the entire construction process, which is a practical problem that both cannot solve. In addition, regardless of the support, the other problems that exist are: first, the structural stability problem caused by soil creep and changes in the surrounding environment of the soil around the foundation pit during the construction period. The soil creep and stability problem is significant in the whole cycle of foundation pit construction under complex environment, and the traditional foundation pit support cannot flexibly change the geometric size, cannot adapt to the stress and deformation changes of the soil, resulting in low support efficiency of the foundation pit support, foundation pit instability and other problems. Second, the poor in-plane deformation stability problem of the traditional foundation pit support. The traditional foundation pit support adopts a four-sided support structure with cross-shaped longitudinal and transverse rod systems alternately, which is prone to in-plane instability deformation under uneven changes in soil stress, mechanical collision or seismic load. Third, the problem of difficult geometric size adjustment, poor turnover and serious pollution of the traditional foundation pit support structure. The traditional foundation pit support structure is made by cast-in-place or one-time forming, which cannot adjust the geometric size according to different foundation pit requirements, resulting in low turnover frequency, high construction cost and other problems. At the same time, after the completion of the foundation pit construction, a large amount of construction waste is generated after the traditional one-time foundation pit support structure is removed, which seriously pollutes the environment. Fourth, the problem of large noise and serious noise pollution of the traditional foundation pit support structure during the application of the pushing force. During the construction in the city, the traditional foundation pit support structure usually uses an oil hydraulic jack, which produces a lot of noise and causes serious noise pollution. Obviously, the above problems need to be solved in an effective way to ensure the stability and safety of the soil of the foundation pit support, and to reduce the turnover frequency and noise of the foundation pit support as much as possible, so as to ensure the actual construction effect. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide an intelligent adjustment limb rod for a foundation pit support system, which can provide basic guarantee for the integrity, stability and safety of the foundation pit soil during the foundation pit support operation, and provide a core operation point for the components of the final overall foundation pit support, and simultaneously has the advantages of high construction flexibility, low turnover cost and low noise.

[0004] To achieve the above object, the present application adopts the following technical solutions:

[0005] The intelligent adjusting limb rod for foundation pit support system comprises a fixed section and a jacking section arranged in sequence along the axial direction, the jacking section comprises a jacking piece and a compensation piece arranged in sequence along the axial direction; the jacking piece comprises a piston cylinder and a piston rod reciprocating in the piston cylinder through a piston, the piston and the piston cylinder form a cavity for storing intermediate medium, the cavity is arranged with a semiconductor refrigeration sheet capable of realizing heating and refrigeration function switching by changing the positive and negative poles, one working surface of the semiconductor refrigeration sheet contacts the intermediate medium; the compensation piece comprises a reduction gear box capable of realizing torque change; the first end gear of the reduction gear box meshes with the force increasing rack, the force increasing rack penetrates through the box body of the reduction gear box and is fixed with the jacking piece or the fixed section or the transverse support rod; the tail end gear of the reduction gear box meshes with the power rack, the top end of the power rack extends out of the box body of the reduction gear box and forms independent cooperation with the power end of the straight stroke power source.

[0006] Preferably, the straight stroke power source comprises a positioning frame fixed to the outer wall of the box body, the top end of the power rack extends outward along the positioning frame and forms a power lead screw, a threaded sleeve is rotationally matched at the passing hole through which the power lead screw passes on the positioning frame, the threaded sleeve and the power lead screw form a screw nut cooperation; the top end of the threaded sleeve is coaxially sleeved with an upper adjusting nut and a lower adjusting nut with an axial spacing, the inner circle of each adjusting nut is in the form of a spline groove; the outer wall of the threaded sleeve is coaxially protruded with an upper protruding ring for rotationally cooperating with the upper adjusting nut and a lower protruding ring for rotationally cooperating with the lower adjusting nut, and each protruding ring is provided with a one-way pawl, so as to form a ratchet and pawl cooperation structure between the one-way pawl and the key groove of the corresponding adjusting nut; at this time, the one-way stop directions of the upper adjusting nut and the lower adjusting nut are opposite to each other.

[0007] Preferably, the outer ring wall of each adjusting nut is recessed with a matching hole for inserting the force applying rod.

[0008] Preferably, the front end of the reduction gear box is arranged with a pressure sensor for monitoring the axial force value of the force increasing rack.

[0009] Preferably, the working surface of the semiconductor refrigeration sheet for contacting the intermediate medium extends into the cavity with a refrigeration copper sheet; the water supplement pipe communicating with the cavity is arranged through the piston cylinder.

[0010] Preferably, the fixed segments are H-shaped channel steels and are arranged at the two ends of the jacking segment, guide rails and guide blocks are arranged in the two side notches of the fixed segments, the two ends of the intermediate plate extend to the guide rails and guide blocks of the two fixed segments and form a sliding rail guide cooperation relationship with the guide rails and guide blocks, the intermediate plate is two groups and cooperates with the guide rails and guide blocks of the two side notches of the fixed segments, the jacking segment is fixed at the region between the two groups of intermediate plates, and the two ends of the jacking segment are respectively mounted on the adjacent ends of the two fixed segments.

[0011] Preferably, the two horizontal support rods are arranged in the same plane, and the two single-limb telescopic rods are cooperated at the positions between the two horizontal support rods; the two ends of each single-limb telescopic rod are hingedly connected with a hinged seat, and the hinged axis of the hinged seat is perpendicular to the axis direction of the single-limb telescopic rod and the length direction of the horizontal support rod; the hinged seat and the horizontal support rod form a reciprocating movement cooperation along the length direction of the horizontal support rod, and the position of the hinged seat relative to the horizontal support rod can be locked by a locking member until the two single-limb telescopic rods cooperate to form a V-shaped support member.

[0012] Preferably, the horizontal support rod is arranged with a dovetail-shaped rail strip with gradually increasing width from the fixed end to the cantilever end, and the hinged seat is recessed with a dovetail guide groove that can be inserted into the rail strip; a guide rack is arranged on the rail strip along the length direction of the horizontal support rod, and a clamping block is arranged at the dovetail guide groove, and the clamping block and the guide rack cooperate to constitute the locking member.

[0013] Preferably, an electromagnet is further arranged at the hinged seat, the electromagnet and the clamping block are sleeved on a directional shaft, a compression spring is sleeved on a section of the directional shaft between the electromagnet and the clamping block, so that the clamping block is attracted by the electromagnet after being powered on to overcome the elastic force of the compression spring, and the positioning teeth at the clamping block are separated from the guide rack; the directional shaft or the clamping block forms a rotation-stopping cooperation with the hinged seat.

[0014] Preferably, the number of jacking members is calculated by the intelligent adjusting limb for the foundation pit support system, characterized in that: the actual number of jacking members required on a single single-limb telescopic rod in a single V-shaped support member n is obtained by the following formula:

[0015]

[0016]

[0017] wherein:

[0018] is the theoretical number of jacking members required for work;

[0019] is the reduction coefficient of active earth pressure of soil body;

[0020] The active earth pressure borne by the single set of V-shaped support members;

[0021] The axial linear rigidity of the ice-state intermediate medium in the jacking piece;

[0022] The equivalent axial linear rigidity of the steel pipe concrete after replacing the single-limb expansion rod with the steel pipe concrete;

[0023] The common axial linear rigidity of the two groups of intermediate plates on the single-limb expansion rod;

[0024] The reduction coefficient of the axial force caused by the slip in the anchoring area;

[0025] The included angle between the single-limb expansion rod and the plane where the vertical transverse support rod is located;

[0026] The axial length of the liquid in the cavity of the single jacking piece;

[0027] The actual required number of jacking pieces;

[0028] [ ]The rounding function. x

[0029] The beneficial effects of the present application are:

[0030] 1) The present application can realize active control of soil stress and deformation by setting the single-limb expansion rod, thereby improving the stability and safety of the foundation pit soil. In addition, in the process of applying jacking force, unlike the traditional loud oil cylinder driving structure, the jacking force is realized by taking advantage of the characteristics of the intermediate medium such as water, which significantly expands in volume after freezing into ice; compared with the traditional oil pressure device, the present application is quieter, no noise is generated, and no waste gas is generated.

[0031] More notably, considering the standard design and convenient use requirements of the jacking piece, the force provided by a group of jacking pieces is often an integer multiple, such as 10 tons, and during actual supporting work, it is impossible to have an integer multiple of the required jacking force; at this time, a compensation piece is needed to realize the compensation function of additional force. In other words, the jacking piece forms a coarse adjustment piece to ensure a large amount of rough supply of force through its water freezing function; the compensation piece forms a fine adjustment piece to realize the relative continuous and subtle adjustment of the jacking force on the basis of the above coarse adjustment, i.e. online accurate adjustment requirement, to ensure the accuracy and stability of the work.

[0032] ​So far, the application can provide basic guarantee for the integrity, stability and operation safety of the foundation pit soil body during the foundation pit supporting operation, and provide core operation point for the components of the final overall foundation pit supporting, and simultaneously has the advantages of high construction flexibility, low turnover cost and low noise.

[0033] 2) The V-shaped supporting components in the application are arranged staggeredly, and a horizontal supporting rod is additionally arranged to form a planar outer constraint boundary, so that a geometrically invariant stable planar supporting system is formed while the calculation length of the V-shaped supporting components is reduced, the planar stability and integrity of the supporting structure are greatly improved, the overall stress of the supporting structure is beneficial, and the overall collapse and damage of the supporting structure caused by uneven stress of individual rods can be prevented. Meanwhile, the V-shaped supporting components also realize flexible adjustment of the geometric size of the supporting structure, improve the turnover frequency of the foundation pit supporting, reduce resource waste, and reduce the overall construction cost, which is remarkable. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a three-dimensional structural schematic diagram of one embodiment of the application;

[0035] Figure 2 It is an assembly schematic diagram of the V-shaped supporting component;

[0036] Figure 3 It is a structural schematic diagram of the rail at the horizontal supporting rod;

[0037] Figure 4 And Figure 5 It is a cooperation state diagram of the hinge seat and the rail;

[0038] Figure 6 It is a three-dimensional structural schematic diagram of the hinge seat;

[0039] Figure 7 It is a cooperation state diagram of the directional shaft and the clamping block;

[0040] Figure 8 It is a cooperation state diagram of the fixed segment, the compensation component and the pushing component of the application;

[0041] Figure 9 It is a sectional view of the pushing component;

[0042] Figure 10 It is an internal structure diagram of the compensation component;

[0043] Figure 11 It is a three-dimensional structural diagram of the two adjusting nuts in the assembly state;

[0044] Figure 12 It is a cooperation state sectional view of the two adjusting nuts and the threaded sleeve;

[0045] Figure 13 It is Figure 12A half-section view;

[0046] Figure 14 This is a diagram showing the fit between the intermediate plate and the guide rail and guide block at the fixed section.

[0047] Figure 15 This is a structural diagram of a vertical column;

[0048] Figure 16 This is a structural schematic diagram of the control end at the top of the vertical column;

[0049] Figure 17 for Figure 16 A sectional view;

[0050] Figure 18 This is a diagram showing the coordination of the hinge baffle, anti-rotation buckle, and stabilizing steel wire at the bottom of the vertical column.

[0051] Figure 19 Image showing the hinge baffle in open position;

[0052] Figure 20 A three-dimensional structural diagram of the stop-rotation buckle;

[0053] Figure 21 This is a three-dimensional structural diagram of the hinge baffle.

[0054] Figure 22 This is a schematic diagram showing the installation location of the support platform on the vertical column.

[0055] The actual correspondence between the reference numerals and component names in this invention is as follows:

[0056] 10-Single-limb telescopic rod; 11-Fixed section; 12-Pushing component; 12a-Semiconductor cooling chip; 12b-Piston cylinder; 12c-Piston rod; 12d-Cooling copper sheet; 12e-Water supply pipe; 13-Compensating component; 13a-Tail power end gear; 13b-Head force-increasing end gear; 13c-Force-increasing rack; 13d-Power rack; 13e-Positioning frame; 13f-Power lead screw; 13g-Threaded sleeve; 13h-Upper adjusting nut; 13i-Lower adjusting nut; 13j-One-way pawl; 13k-Pressure sensor; 14-Hinge seat; 14a-Dovetail guide groove; 14b-Clamping block; 14c-Electromagnet; 14d-Directional shaft; 14e-Compression spring; 15-Guide block; 16-Intermediate plate;

[0057] 20 - Lateral support rod; 21 - Rail; 21a - Guide rack;

[0058] 30-Vertical column; 31-Vertical groove; 32-Support platform; 33-Support groove; 34-Hinge baffle; 34a-Wedge-shaped opening; 35-Anti-rotation buckle; 35a-Wedge block; 36-Pull rope; 37a-Tightening bolt; 37b-Tightening nut; 37c-Axial force sensor; 37d-Displacement sensor; 38-Positioning table; 39-Stabilizing steel wire. Detailed Implementation

[0059] For ease of understanding, this section combines... Figures 1-22 The specific structure and operation of the present invention are further described below:

[0060] like Figure 1 As shown, the present invention ultimately forms an adaptive prefabricated steel structure foundation pit support system, which refers to... Figure 1 As shown, this is an improvement on the traditional foundation pit support structure; the system includes horizontal support rods 20, V-shaped support components, and vertical columns 30, etc. Among them, the horizontal support rods 20 and V-shaped support components are combined to form intelligent adjustable limbs for the foundation pit support system.

[0061] in:

[0062] like Figures 1-3 As shown, the transverse support rod 20 is formed by welding double web plates to form an H-beam. Carbon fiber concrete supports are then added to the H-beam cavity. If necessary, the carbon fiber concrete can be reliably connected to the double web plate H-beam via connecting keys to form a unified whole for load-bearing. The combination of carbon fiber concrete and steel significantly increases the axial stiffness of the support structure and improves its load-bearing potential to some extent. This helps to cope with unexpected increases in axial force caused by changes in the external environment and soil properties during service, thus increasing the safety reserve of the support structure. Simultaneously, adding carbon fiber to the concrete improves its integrity, preventing breakage during turnover and reducing shrinkage cracks during the hardening process. Rails 21 are welded to the outer sides of the double web plate welded H-beam in a specific sequence to fix the V-shaped support members. This allows for adjustable angles and lateral movement of the V-shaped support members, making the stress distribution more rational while meeting the excavation space requirements for foundation pit construction.

[0063] like Figures 1-2 As shown, the V-shaped support member consists of two single-limb telescopic rods 10 of the same length, forming a "V" shape on the plane containing the two transverse support rods 20. (Refer to...) Figure 1As shown, multiple V-shaped support members are arranged alternately in the transverse direction of the foundation pit excavation. This arrangement ensures sufficient excavation space for the foundation pit construction while also creating a geometrically invariant structure between adjacent transverse support members (20 members each). This not only increases the overall integrity of the support structure but also prevents catastrophic foundation pit support failure due to unexpected internal forces in individual transverse support members during construction. A similar layout can be used in actual construction. Figure 1 The arrangement of the support modules, which have two or more layers, is shown. Each support module is mounted on a corresponding vertical column 30, thus forming a three-dimensional foundation pit support system.

[0064] like Figure 8 and Figure 14 As shown, the single-limb telescopic rod 10 includes two sets of fixed sections 11 and an intermediate plate 16 that connects the two sets of fixed sections 11 via guide rails and guide blocks 15. The hollow cavity formed by the Type II structure at the fixed section 11 can be equipped with transverse diaphragms at intervals to increase the local stability of the steel plate; alternatively, concrete can be directly poured into the cavity. Furthermore, each end of the single-limb telescopic rod 10 has a hardened round rod, which cooperates with the hinge seat 14 to anchor the single-limb telescopic rod 10. A corresponding space is provided at the location of the intermediate plate 16 in the middle of the single-limb telescopic rod 10 to store the jacking component 12 and the compensation component 13.

[0065] like Figures 3-7 As shown, the dovetail guide groove 14a on the hinge seat 14 engages with the rail 21 via a locking mechanism. This locking mechanism includes a directional shaft 14d and a locking block 14b, supplemented by an electromagnet 14c. Its function is to connect the V-shaped support member and the entire transverse support structure together. When the electromagnet 14c is opened, the locking block 14b, under the action of electromagnetic force, presses against the compression spring 14e and moves upward as a whole. At this time, the locking mechanism can slide axially along the directional shaft 14d until it disengages from the guide rack 21a. The position of the single-limb telescopic rod 10 on the transverse support rod 20 can then be adjusted. Conversely, when the electromagnet 14c is closed, under the action of the compression spring 14e, the locking block 14b moves downward under the action of electromagnetic force. At this time, the locking mechanism re-locks itself onto the guide rack 21a on the rail 21.

[0066] like Figures 8-9As shown, the actual design of the pusher 12 includes a steel inner liner, a steel protective outer jacket, a piston, a semiconductor cooling chip 12a, a cooling copper plate 12d, a sealing rubber ring, heat insulation material, a water external circulation interface, and wires, etc. The steel inner liner forms a cavity, which is pre-filled with water as an intermediate medium. By energizing the semiconductor cooling chip 12a, the water can be rapidly frozen, causing its volume to expand, thereby pushing the piston to move. This, in turn, causes the piston rod 12c to move forward relative to the piston cylinder 12b, ultimately applying the push force. The cooling copper plate 12d is used for rapid heat exchange between the water and the semiconductor cooling chip 12a. The water external circulation interface is used to connect to the water supply pipe 12e to realize heat exchange between the pusher 12 and the outside world or water replenishment. By reversing the two wires of the semiconductor cooling chip 12a, the ice inside the steel inner liner can be converted into water, thereby unloading the push force.

[0067] like Figure 8 and Figure 10 As shown, the compensation component 13 includes a reduction gearbox, also known as a power changer, which is generally composed of gears and racks. By means of the continuous force change of multiple gears, a larger axial force at one end can be converted into a smaller force at the other end, and a smaller axial strain at one end can be converted into a larger displacement at the other end, thus facilitating the manual and continuous adjustment of axial force by construction personnel. It eliminates the need for heavy and space-consuming machine operation, and while ensuring a compact structure, it also meets the requirements for fast and flexible operation in small spaces, making it very suitable for the environment in which this invention is located.

[0068] In addition, such as Figures 10-13 As shown, a special nut device, namely an adjusting nut, is provided on the threaded section of the power rack 13d. During construction, the operator inserts the force-applying rod into the mating hole of the adjusting nut 13i at the positioning bracket 13e, and rocks the force-applying rod forward. This tightens the threaded sleeve 13g via the ratchet and pawl mechanism formed by the one-way pawl 13j. At this time, the power screw 13f moves downward, driving the power rack 13d downward. The force is then transmitted forward through the tail power end gear 13a to the head amplifying end gear 13b and the amplifying rack 13c, ultimately achieving force amplification adjustment. Conversely, the operator inserts the force-applying rod into the upper adjusting nut 13h, and rocks the force-applying rod backward to loosen the upper adjusting nut 13h, thereby reducing the force. In addition, a pressure sensor 13k is installed at the end of the power box for intelligent detection of the axial force of the rod. The pawls of the lower adjusting nut 13i and the upper adjusting nut 13h are positioned in opposite directions to achieve the above-mentioned action function.

[0069] like Figures 15-21As shown, the vertical column 30 is entirely composed of H-beams, with an opening hinge baffle 34 at the bottom. The upper part of the vertical column 30 has a tension bolt 37a and a tension nut 37b located on the positioning platform 38, forming a screw-nut engagement to achieve real-time lifting of the thick steel wire rope, i.e., the pull rope 36, thereby lifting the anti-rotation buckle 35 at the hinge baffle 34. A displacement sensor 37d at the upper part of the vertical column 30 is used to control the lifting height of the anti-rotation buckle 35. During operation, an axial steel pipe can be considered to protect the thick steel wire rope, i.e., the pull rope 36, inside. The upper part of the pull rope 36 is connected to the threaded tension bolt 37a, and the lower part is connected to the anti-rotation buckle 35. An axial force sensor 37c is located at the upper part of the pull rope 36 to determine whether the stabilizing steel wire 39 is broken during the tightening of the tension nut 37b. The anti-rotation clip 35 serves two purposes: first, it inhibits the rotation of the hinge baffle 34 before the stabilizing wire 39 breaks; second, during the installation of the vertical column 30, after the stabilizing wire 39 breaks, the wedge block 35a and the wedge opening 34a provide a forced rotational displacement to the hinge baffle 34, causing it to open automatically under soil resistance. The hinge baffle 34, once open, significantly increases the cross-section of the vertical column 30, thereby increasing its vertical bearing capacity. When the vertical column 30 is pulled out, since the stabilizing wire 39 has broken, the anti-rotation clip 35 no longer obstructs the movement of the hinge baffle 34, allowing it to automatically close under soil resistance during upward movement, facilitating the removal of the vertical column 30. In other words, the function of the stabilizing steel wire 39 is only to hold the anti-rotation buckle 35 during the installation of the vertical column 30, so as to prevent the hinge baffle 34 from being accidentally opened due to the upward movement of the anti-rotation buckle 35 during the installation of the vertical column 30, thereby affecting the normal installation of the vertical column 30; once the neck section is subjected to force and breaks, it loses its restraining effect on the hinge baffle 34.

[0070] like Figure 22 As shown, a vertical groove 31 is arranged along the length of the vertical column 30, allowing the vertical guide block to slide along a guide rail. A support platform 32, or support, extends horizontally from the vertical guide block. The support platform 32 is welded from rectangular steel pipes and has a support groove 33 on it. The purpose of this groove is to connect the horizontal support rod 20 and the vertical column 30 together, reducing the span of the horizontal support and improving the overall stability of the horizontal support and the integrity of the support structure.

[0071] Therefore, the overall installation process of this invention is as follows:

[0072] S1. Excavate the surface soil inside the foundation pit and install the fence. Set out the construction lines and position the vertical columns 30.

[0073] S2. Assemble the vertical columns 30

[0074] During the assembly of the vertical column 30, firstly, the pull rope 36, equipped with an axial force sensor 37c and a tension bolt 37a, is threaded into the corresponding steel pipe of the vertical column 30, ensuring that the tension bolt 37a at the top of the pull rope 36 is tightened with the tension nut 37b at the positioning table 38. Then, the anti-rotation buckle 35 is placed into the corresponding groove and welded to the pull rope 36. Next, the hinge baffle 34 is rotated until it is flush with the outer surface of the vertical column 30, and the wedge block 35a on the anti-rotation buckle 35 is inserted into the wedge-shaped opening 34a at the upper part of the hinge baffle 34. Then, the stabilizing steel wire 39 is inserted... Figure 18 At the corresponding positions shown, tighten the fixing screws of the stabilizing steel wire 39 to ensure that the stabilizing steel wire 39 is taut against the anti-rotation buckle 35 and the vertical column 30, while the hinge baffle 34 is in the closed state. Finally, initially tighten the tension nut 37b of the vertical column 30 and install the displacement sensor 37d.

[0075] S3, Piling machine drives vertical columns 30

[0076] When the vertical column 30 is almost driven to the target construction elevation, the construction worker manually tightens the tension nut 37b at the top of the vertical column 30 until the tension wire 39 breaks. This process can be monitored by the axial force sensor 37c. Then, the tension nut 37b is continued to be tightened until the anti-rotation clip 35 pulls out of the hinge baffle 34 a certain distance. This process can be monitored by the displacement sensor 37d. During the upward movement of the anti-rotation clip 35, the hinge baffle 34 will be forced to rotate by the wedge block 35a to achieve the desired effect. Figure 19 As shown in the diagram. Next, continue driving the vertical column 30 a short distance until the hinge baffle 34 is fully open. This process is monitored by the piling machine's auxiliary equipment.

[0077] S4, Installation support platform 32

[0078] First, locate the support platform 32, then tighten the relevant bolts to position the support platform 32, and determine the width of the support groove 33.

[0079] S5. Install horizontal support rod 20

[0080] Install a horizontal support rod 20 on the support groove 33.

[0081] S6. Install V-shaped support components

[0082] like Figure 8As shown, the intermediate plate 16 is first fitted to the fixed section 11 via guide rails and guide blocks 15; the fixed section 11 is a welded double-web H-beam filled with carbon fiber concrete, forming a single-limb telescopic rod 10. Then, the number of jacking members 12 is selected according to the longitudinal spacing of the transverse support rods 20 and the included angle of the V-shaped support members; next, the jacking members 12 and the compensation members 13 are installed sequentially at the intermediate plate 16. Subsequently, the locking members and the hinge seat 14 are installed, and the tight fit between the hinge seat 14 and the rail 21 is ensured.

[0083] The other single-limb telescopic rod 10 of the V-shaped support member is installed using the same method.

[0084] Repeat step S6 to install the first foundation pit support structure, namely the remaining V-shaped support components of the first layer support module.

[0085] S7. Apply pre-jacking force

[0086] like Figures 10-13 As shown, firstly, based on the magnitude of the pre-jacking force, select the number of jacking components 12 connected to the power supply and apply the pre-jacking force. Then, rotate the lower adjusting nut 13i on the reduction gearbox at the compensation component 13 to ensure that the axial force in the rod reaches the target value. This process is monitored by the pressure sensor 13k. When it is necessary to remove the pre-jacking force, the upper adjusting nut 13h can be rotated for adjustment; next, rotate the threaded sleeve 13g to unload the force. Finally, the wires can be reversed to further eliminate the internal force in the jacking component 12, so as to facilitate the removal of the reduction gearbox and each jacking component 12.

[0087] S8. Excavate the remaining soil in this layer and the upper soil of the next layer, and repeat steps S4-S7 to install the second layer of support structure in the foundation pit, i.e., the second layer of support modules. Repeat this process until all layers of support modules are completed, achieving the purpose of installing the entire foundation pit support.

[0088] Example 1

[0089] Taking two load cases as examples, the calculation results are shown in Table 1:

[0090] Table 1

[0091]

[0092] As shown in Table 1 above, in actual calculations, this invention only requires basic measurable data to quickly obtain the actual quantity of relevant jacking components. The calculation process is highly efficient and concise, and ensures that the calculation results are within a reasonable range of accuracy, thus laying a solid foundation for the smooth progress of the project and achieving significant results.

[0093] Of course, those skilled in the art will recognize that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0094] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0095] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. An intelligent adjustable limb for a foundation pit support system, characterized in that: The device includes a single-limb telescopic rod, comprising a fixed section (11) and a pushing section arranged sequentially along the axial direction. The pushing section includes a pushing member (12) and a compensating member (13) arranged sequentially along the axial direction. The pushing member (12) includes a piston cylinder (12b) and a piston rod (12c) that reciprocates within the piston cylinder (12b) via a piston. The piston and piston cylinder (12b) enclose a cavity into which an intermediate medium can be stored. The cavity is also equipped with a semiconductor cooling chip (12a) that switches between heating and cooling functions by changing the positive and negative electrodes. One of the working surfaces of the compensation component (13) contacts the intermediate medium; the compensation component (13) includes a reduction gearbox that can realize torque variation; the first end gear (13b) of the reduction gearbox meshes with the first end rack (13c), the first end rack (13c) passes through the gearbox housing and is fixed to the push component (12) or the fixed section (11) or the transverse support rod (20); the last end gear (13a) of the reduction gearbox meshes with the power rack (13d), the top of the power rack (13d) extends out of the gearbox housing and forms an independent engagement with the power end of the linear power source; The linear power source includes a positioning frame (13e) fixed to the outer wall of the housing. The top end of the power rack (13d) extends outward along the positioning frame (13e), and the extended section forms a power screw (13f). A threaded sleeve (13g) is rotatably fitted at a passage hole on the positioning frame (13e) through which the power screw (13f) passes. A screw-nut fit is formed between the threaded sleeve (13g) and the power screw (13f). The top end of the threaded sleeve (13g) is coaxially fitted with an upper adjusting nut (13h) and a lower adjusting nut with axial clearance. The adjusting nut (13i) has an inner ring with a spline groove. The outer wall of the threaded sleeve (13g) is coaxially provided with an upper convex ring for forming a rotary fit with the upper adjusting nut (13h) and a lower convex ring for forming a rotary fit with the lower adjusting nut (13i). Each convex ring is provided with a one-way pawl (13j), so that a ratchet pawl fit structure is formed between the one-way pawl (13j) and the keyway at the corresponding adjusting nut. At this time, the one-way stopping directions of the upper adjusting nut (13h) and the lower adjusting nut (13i) are opposite to each other.

2. The intelligent adjustable limb for a foundation pit support system according to claim 1, characterized in that: Each adjusting nut has a recessed fitting hole on its outer ring wall for inserting a force-applying rod.

3. The intelligent adjustable limb for a foundation pit support system according to claim 1, characterized in that: With the end of the gearbox where the booster rack (13c) is located as the front end, a pressure sensor (13k) for monitoring the axial force value of the booster rack (13c) is arranged at the front end of the gearbox.

4. The intelligent adjustable limb for a foundation pit support system according to claim 1, 2, or 3, characterized in that: A cooling copper sheet (12d) extends into the cavity from the working surface of the semiconductor cooling chip (12a) that is in contact with the intermediate medium; a water supply pipe (12e) is provided through the piston cylinder (12b) to communicate with the cavity.

5. The intelligent adjustable limb for a foundation pit support system according to claim 1, 2, or 3, characterized in that: The fixed section (11) is an H-shaped channel steel and is placed at both ends of the push section. Guide rails and guide blocks (15) are arranged in the slots on both sides of the fixed section (11). The two ends of the intermediate plate (16) extend to the guide rails and guide blocks (15) of the two fixed sections (11) respectively and form a sliding rail guide relationship with the guide rails and guide blocks (15). The intermediate plate (16) consists of two sets and is respectively matched with the guide rails and guide blocks (15) at the slots on both sides of the fixed section (11). The push section is fixed in the area between the two intermediate plates (16) and the two ends of the push section are respectively installed on the adjacent ends of the two fixed sections (11).

6. The intelligent adjustable limb for a foundation pit support system according to claim 1, 2, or 3, characterized in that: It also includes two transverse support rods (20) arranged in the same plane, and two single-limb telescopic rods are fitted between the two transverse support rods (20); each single-limb telescopic rod has a hinge seat (14) at both ends, and the hinge axis of the hinge seat (14) is perpendicular to the axis of the single-limb telescopic rod and the length direction of the transverse support rod (20); the hinge seat (14) and the transverse support rod (20) form a reciprocating motion fit along the length direction of the transverse support rod (20), and the position of the hinge seat (14) relative to the transverse support rod (20) can be locked by the locking member until the two single-limb telescopic rods fit together to form a V-shaped support member.

7. The intelligent adjustable limb for a foundation pit support system according to claim 6, characterized in that: A dovetail-shaped rail (21) with gradually increasing width from the fixed end to the cantilever end is arranged at the transverse support rod (20). A dovetail guide groove (14a) is recessed at the hinge seat (14) and can be inserted into the rail (21). A guide rack (21a) is arranged on the rail (21) along the length direction of the transverse support rod (20). A locking block (14b) is arranged at the dovetail guide groove (14a). The locking block (14b) and the guide rack (21a) cooperate to form the locking member.

8. The intelligent adjustable limb for a foundation pit support system according to claim 7, characterized in that: An electromagnet (14c) is also provided at the hinge seat (14). The electromagnet (14c) and the locking block (14b) are both sleeved on the directional shaft (14d). A compression spring (14e) is sleeved on a section of the directional shaft (14d) between the electromagnet (14c) and the locking block (14b). When the electromagnet (14c) is energized, it overcomes the elastic force of the compression spring (14e) to attract the locking block (14b), causing the positioning teeth at the locking block (14b) to disengage from the guide rack (21a). An anti-rotation fit is formed between the directional shaft (14d) or the locking block (14b) and the hinge seat (14).

9. A method for calculating the number of jacking components, wherein the method applies the intelligent adjusting rod for the foundation pit support system as described in claim 6, characterized in that: The actual number of jacking components (12) required on a single single-limb telescopic rod within a single set of V-shaped support components. n It can be obtained through the following formula: in: The number of pushers (12) required for theoretical operation; This is the reduction factor for active earth pressure on the soil. The active earth pressure borne by this single set of V-shaped support components; The axial linear stiffness of the ice-state intermediate medium inside the jacking component (12); The equivalent axial stiffness of the steel-concrete composite tube after replacing the single-limb telescopic rod; The common axial stiffness of the two sets of intermediate plates (16) on a single single-limb telescopic rod; This is the reduction factor for axial force caused by slippage in the anchorage zone; The angle between the plane containing the single telescopic rod and the vertical and horizontal support rod (20); The axial length of the liquid inside the cavity of a single pusher (12); The actual number of pushers (12) required for operation; [ To x Integer function.

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