A steel support system for foundation pit support

Abstract

The present invention provides a steel support system for foundation pit support, belonging to the field of foundation pit support, and is used to support the foundation pit in foundation pit engineering. Foundation pit construction is extremely likely to cause damage such as settlement of surrounding buildings and municipal pipelines, so there are very high requirements for construction quality and deformation control. In the prior art, the steel supports that can achieve axial force compensation have problems of high cost and weak structure. This steel support system includes a plurality of steel supports, and both ends of the steel supports are respectively connected to the foundation pit side through quick-installation and quick-disassembly structures. The steel support includes a flexible section and an adjustment section. Two flexible sections are respectively arranged at both ends of the steel support. The flexible section includes a flexible head and a fixed head that are slidably matched, and the adjustment section is arranged inside the steel support. With the cooperation of the sliding function of the flexible section and the telescopic function of the adjustment section, the overall length of the steel support can be adjusted. In the present invention, the entire steel support system only requires a set of servo adjustment mechanisms, having the effects of low cost and high reliability.

Description

Technical Field

[0001] The invention belongs to the field of foundation pit support, and particularly relates to a steel support system for foundation pit support. Background Art

[0002] Foundation pit projects are sometimes located in busy sections with dense population, and there are many surrounding buildings and roads. During the construction of foundation pits, it is extremely easy to cause settlement, cracking or local damage to the surrounding buildings and municipal pipelines. Therefore, there are very high requirements for construction quality and deformation control. In related technologies, a retaining structure composed of a diaphragm wall and a horizontal support is often adopted to effectively control the influence of foundation pit excavation on the surrounding pipelines and buildings. The safety and deformation control effect of the foundation pit are closely related to the reasonable design of the retaining structure. When designing the retaining structure, two key indicators, namely safety and project cost, should be comprehensively considered.

[0003] Concrete supports and steel supports are commonly used foundation pit retaining structures, and their load conditions are closely related to the magnitude of the axial force acting on the support during excavation. Since the magnitude of the support load changes with the excavation process, clarifying its change situation and correspondingly compensating the axial force by the steel support not only helps to reduce the influence of foundation pit excavation on the surrounding buildings, but also plays a crucial role in the safety of foundation pit construction.

[0004] In the prior art, in order to achieve precise axial force control for each steel support, a telescopic servo system such as a hydraulic cylinder or an electric cylinder is often connected to the steel support body, and the axial force is adjusted by adjusting the telescopic amount of the telescopic servo system, so as to precisely compensate the supporting force of the steel support. There are mainly two problems with this method. One is that the cost of the steel support is high. Each steel support needs to be equipped with a servo system, and at the same time, it will also increase the complexity of the installation and disassembly work of the steel support. On the other hand, directly connecting the hydraulic cylinder and the electric cylinder to the steel support body will also cause the mechanical properties of the steel support body to decrease, and the servo system becomes a weak point of the steel support structure. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a steel support system for foundation pit support, which is used to solve the problems of high cost of the steel support system capable of axial force compensation and weak structural points of the steel support in the prior art.

[0006] To achieve the above object and other related objects, the present invention provides a steel support system for foundation pit support, including a first foundation pit side, a second foundation pit side, and a steel support disposed between the first foundation pit side and the second foundation pit side;

[0007] Quick-installation and quick-disassembly structures are oppositely arranged on both the first foundation pit side and the second foundation pit side, and both ends of the steel support are respectively connected to the first foundation pit side and the second foundation pit side through the quick-installation and quick-disassembly structures;

[0008] The steel support includes a flexible section and an adjustment section;

[0009] There are two flexible sections, which are respectively arranged at both ends of the steel support and connected to the quick-installation and quick-disassembly structure. The flexible section includes a fixed head and a flexible head. The fixed head is connected to the quick-installation and quick-disassembly structure. The flexible head is arranged at the end of the main body of the steel support. The flexible head and the fixed head are in sliding fit, and the sliding direction is the axial direction of the steel support;

[0010] The adjustment section is arranged inside the steel support, and the adjustment section can be extended or shortened.

[0011] Optionally, the adjustment section includes a first passive section, a second passive section, an active section and an adjustment nut;

[0012] The first passive section and the second passive section are arranged oppositely and their axes coincide. Internal threads are provided inside both the first passive section and the second passive section and the thread helix directions are opposite. The outer cylindrical surfaces of the first passive section and the second passive section are both smooth guiding surfaces;

[0013] The active section includes an inner rod body and an outer shell body;

[0014] External threads are provided on the inner rod body. The external thread helix directions at both ends of the inner rod body are opposite and are respectively matched with the internal threads of the first passive section and the second passive section;

[0015] The inner side of the outer shell body is a smooth guiding surface and is matched with the outer cylindrical surfaces of the first passive section and the second passive section. External threads are provided on the outer side of the outer shell body;

[0016] The adjustment nut is arranged on the outer cylindrical surface of the active section. The adjustment nut includes an annular nut shell body, a planetary ring and a plurality of stud bolts;

[0017] Two of the planetary rings are respectively rotatably arranged on the inner sides at both ends of the nut shell body;

[0018] A plurality of the stud bolts are annularly distributed on the inner circumferential side of the nut shell body, and both ends of the stud bolts are respectively rotatably connected to the planetary rings;

[0019] The middle sections of the stud bolts and the nut shell body are mutually matched thread sections. Both ends of the stud bolts are gear sections. The gear sections are meshed with the tooth rings of the planetary rings. Threads are also superimposed on the gear sections of the stud bolts and the specifications of the threads are the same as those of the thread sections. The threads of a plurality of the stud bolts are all matched with the external threads on the outer side of the outer shell body;

[0020] A protruding force-bearing ring is arranged on the outer cylindrical surface of the nut shell body.

[0021] Optionally, flexible corrugated sleeves are provided at both ends of the nut housing, and the corrugated sleeves shield the threads on the outer housing of the active section inside.

[0022] Optionally, the inner rod body is provided with a first pressure hole, a second pressure hole and a third pressure hole penetrating therethrough;

[0023] The first pressure hole coincides with the axis of the inner rod body;

[0024] The second pressure hole is parallel to the axis of the inner rod body and is located in the area between the inner rod body and the outer housing;

[0025] The third pressure hole is in the radial direction of the inner rod body and is located in the middle section area of the active section;

[0026] The first pressure hole, the first pressure hole and the third pressure hole communicate with each other.

[0027] Optionally, the steel support further includes at least one extension section, the extension section is arranged inside the steel support, and the flexible section, the extension section and the adjustment section adopt a unified connection structure with each other.

[0028] Optionally, the quick installation and disassembly structure includes a first force transmission seat, a steel collar and a second force transmission seat;

[0029] A plurality of the first force transmission seats are spaced at the same height on the side wall of the foundation pit, the steel collar is arranged on the tops of the plurality of first force transmission seats, one side of the steel collar is aligned with the side wall of the foundation pit, and a plurality of second force transmission seats are spaced on the other side;

[0030] The second force transmission seat includes a force receiving plate and a limiting plate. The force receiving plate is fixedly connected to the steel collar. There are two limiting plates. The two limiting plates are respectively arranged at both ends of the force receiving plate and are parallel to the force receiving plate. The area enclosed by the force receiving plate and the limiting plate is a limiting area. The size of the limiting area matches the end of the fixed head, and chamfers are provided on the top side lines of the limiting area.

[0031] Optionally, a distance sensor is installed on the first force transmission seat.

[0032] Optionally, a notch is provided at the sliding structure between the flexible head and the fixed head.

[0033] Optionally, an axial force sensor is provided at the docking position between the flexible head and the fixed head.

[0034] Optionally, a first suspension structure and a second suspension structure are provided on both the first foundation pit side and the second foundation pit side;

[0035] The first suspension structure is connected between the steel collar and the foundation pit side;

[0036] The second suspension structure is connected between the fixed head, the movable head and the foundation pit side.

[0037] As described above, a steel support system for foundation pit support of the present invention has at least the following beneficial effects:

[0038] The steel support has low cost and good structural integrity, and has good reliability. Specifically, the steel support system includes a plurality of steel supports, and both ends of the steel support are respectively connected to the first foundation pit side and the second foundation pit side through a quick installation and disassembly structure. The steel support body includes a movable section and an adjustment section. The two movable sections are respectively arranged at both ends of the steel support and are connected to the quick installation and disassembly structure. The movable section includes a movable head and a fixed head that are slidably matched, and the adjustment section is arranged inside the steel support. Through the adjustment of the external adjustment mechanism, with the cooperation of the sliding function of the movable section and the telescopic function of the adjustment section, the overall structural integrity of the steel support is not damaged, and the overall length of the steel support can be changed. The entire steel support system only requires a set of servo adjustment mechanisms, which not only significantly reduces the cost of the steel support system, but also the servo adjustment mechanism is independent of the steel support system and does not need to be arranged inside the steel support, making the reliability of each steel support higher and the mechanical properties better. Description of the Drawings

[0039] Figure 1 Shows a schematic diagram of the whole of the present invention.

[0040] Figure 2 Shows the present invention Figure 1 Partial enlarged schematic diagram at A in [the present invention].

[0041] Figure 3 Shows a schematic diagram of a single steel support of the present invention.

[0042] Figure 4 Shows a schematic sectional view of the adjustment section of the present invention.

[0043] Figure 5 Shows a partial sectional view schematic diagram of the adjusting nut of the present invention.

[0044] Figure 6 Shows a schematic diagram of the quick installation and disassembly structure of the present invention.

[0045] Figure 7 Shows a schematic diagram of the movable section of the present invention.

[0046] Wherein: the quick installation and disassembly structure 1, the first force transmission seat 11, the steel collar 12, the second force transmission seat 13, the force receiving plate 131, the limiting plate 132, the limiting area 133, the chamfer 1331, the distance sensor 14, the steel support 2, the flexible section 21, the fixed head 211, the flexible head 212, the notch 213, the axial force sensor 214, the adjustment section 22, the first passive section 221, the second passive section 222, the active section 223, the inner rod body 2231, the first pressure hole 22311, the second pressure hole 22312, the third pressure hole 22313, the outer shell 2232, the adjusting nut 224, the nut housing 2241, the force receiving ring 22411, the corrugated sleeve 22412, the planetary ring 2242, the stud 2243, the threaded section 225, the gear section 226, the extension section 23, the first suspension structure 31, the second suspension structure 32. Detailed implementation manners

[0047] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0048] Please refer to Figures 1 to 7 It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the implementation conditions of the present invention. Therefore, they do not have any technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" used in this specification are only for the convenience of clear narration and are not used to limit the implementation scope of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0049] The following are only for illustrative purposes for each embodiment. Combinations can be made between each embodiment, and it is not limited to the content shown in the following single embodiment.

[0050] In this embodiment, please refer to Figures 1-3, an embodiment of a steel support system for foundation pit support provided by the present invention includes a first foundation pit side, a second foundation pit side, and multiple steel supports 2 arranged between the first foundation pit side and the second foundation pit side. Quick-installation and quick-disassembly structures 1 are relatively arranged on both the first foundation pit side and the second foundation pit side. The two ends of the steel support 2 are respectively connected to the first foundation pit side and the second foundation pit side through the quick-installation and quick-disassembly structures 1. Under the action of the quick-installation and quick-disassembly structures 1, during construction, the steel support 2 can be directly hoisted by a crane to complete the installation, without the need for additional connection work by personnel, which not only improves the construction efficiency but also can avoid the danger of working on the foundation pit side. For the specific structure of the steel support 2, please refer to Figure 3 , the steel support 2 includes an active section 21 and an adjustment section 22. Among them, there are two active sections 21, which are respectively arranged at both ends of the steel support 2 and connected to the quick-installation and quick-disassembly structure 1. The active section 21 includes a fixed head 211 and an active head 212. The fixed head 211 is connected to the quick-installation and quick-disassembly structure 1, and the active head 212 is arranged at the end of the body of the steel support 2. The active head 212 and the fixed head 211 are in sliding fit, and the sliding direction is the axial direction of the steel support 2; while the adjustment section 22 is arranged inside the steel support 2, and the adjustment section 22 can be extended or shortened.

[0051] In the above embodiment, the driving force for the extension or shortening of the adjustment section 22 is provided by an external mechanical device. The main process of implementing this steel support system is as follows:

[0052] The first step is to install the quick-installation and quick-disassembly structure. The quick-installation and quick-disassembly structures 1 are fixedly installed on both sides of the foundation pit. It should be ensured that the heights are the same and aligned, so as to ensure that the subsequent installed steel supports 2 are horizontal and perpendicular to the foundation pit side at both ends;

[0053] The second step is to hoist each steel support. First, the steel support 2 is assembled outside the foundation pit. The sliding distance between the fixed head 211 and the active head 212 of the active section 21 at both ends of the steel support 2 is adjusted to ensure that the total length of the steel support 2 roughly matches the installation positions on the quick-installation and quick-disassembly structures 1 on both sides of the foundation pit. Then the steel support 2 is hoisted by a crane. When hoisting, it should be ensured to be stable to prevent slipping. The two ends of the steel support 2 are placed into the quick-installation and quick-disassembly structures 1 by the crane. Thanks to the special design of the quick-installation and quick-disassembly structure 1, in this step, the steel support 2 can be stably installed by simply putting it in, without the need for verticality adjustment and secondary manual connection. When disassembling, it can also be removed by directly hoisting without manual operation;

[0054] The third step is to perform axial force compensation. Adjust the telescopic length of the adjustment section 22, thereby changing the length of the entire steel support 2, and changing the axial force in the steel support 2 through the length change of the steel support 2. In this step, the length of the adjustment section 22 is adjusted by an external mechanical device. Specifically, during implementation, the amount of adjustment can be judged by the length change of the adjustment section 22 or the reaction force acting on the external device;

[0055] In the fourth step, the position of the external mechanical device is changed to adjust the axial forces of multiple steel supports 2.

[0056] Compared with the solutions in the prior art, the solution of this embodiment has at least three advantages. First, the structure of the steel support 2 is more stable; second, the cost of the entire steel support system is lower; and third, the loading and unloading process is simpler. In the prior art, to achieve the axial force adjustment effect, there are mainly two implementation methods: One is to fixedly connect one end of the steel support to one side of the foundation pit, and set a swivel joint at the other end of the steel support. After the steel support is initially installed, a jack is set at the swivel joint end, and the axial force is applied to the steel support through the jack, causing the swivel joint to elongate. Then, a steel wedge is inserted into the swivel joint to limit its position and keep the existing extended amount, thereby maintaining the axial force in the steel support. After that, the jack can be removed. In this method, fixed installation is required at one end, and positioning and setting the jack to apply axial force are also required at the other end. Even with the limiting effect of the wedge after the jack is removed, the axial force will still decrease significantly. Moreover, this method can only adjust the axial force during the initial installation and cannot be dynamically adjusted during subsequent construction. Generally speaking, the construction process is complex, the loading and unloading of the steel support is inconvenient, and there are deficiencies in the axial force adjustment effect and timing. The other implementation method is to set an adjustment mechanism in the middle of the steel support, such as setting a hydraulic cylinder, connecting the hydraulic cylinder to the support as a whole, and realizing the change in length through the telescoping of the hydraulic cylinder, thereby compensating the axial force. Although this method can adjust in real time, on the one hand, a hydraulic cylinder needs to be set for each steel support, which will seriously increase the cost and pipeline complexity of the entire support system, and there are also risks such as leakage and failure. Moreover, since the adjustment mechanism is set in the middle of the steel support, maintenance and operation are dangerous and inconvenient. On the other hand, setting a hydraulic cylinder or other telescoping device in the middle of the steel support will damage the structural integrity, and the self-weight of the mechanism will also increase the load of the steel support and reduce the reliability. In the solution of this embodiment, both ends of the steel support 2 are connected through the quick installation and disassembly structure 1 and are directly lifted and placed without an additional installation and connection process, making the loading and unloading process simpler; a telescoping mechanism is set inside the steel support 2, and the driving force for telescoping is provided externally. There is no hydraulic or electric telescoping device on the steel support 2 itself, which ensures the integrity of the overall structure of the steel support 2 and improves its structural strength. On the other hand, since the driving force for telescoping is provided externally, the same set of driving devices can be used to adjust all the steel supports 2, greatly reducing the cost of the entire steel support system.

[0057] For this embodiment, please refer to Figures 4-5, a specific implementation manner of the adjustment section 22 is provided. The adjustment section 22 includes a first passive section 221, a second passive section 222, an active section 223, and an adjustment nut 224. The first passive section 221 and the second passive section 222 are oppositely arranged and have coincident axes. Internal threads are provided inside both the first passive section 221 and the second passive section 222, and the thread directions are opposite. The outer circular surfaces of the first passive section 221 and the second passive section 222 are both smooth guiding surfaces. The active section 223 includes an inner rod body 2231 and an outer shell body 2232. External threads are provided on the inner rod body 2231, and the thread directions of the external threads at both ends of the inner rod body 2231 are opposite and are respectively engaged with the internal threads of the first passive section 221 and the second passive section 222. The inner side of the outer shell body 2232 is a smooth guiding surface and is engaged with the outer circular surfaces of the first passive section 221 and the second passive section 222. A simple implementation manner is to arrange the adjustment nut 224 on the outer circular surface of the active section 223. A lead screw pair is directly formed by the cooperation between the adjustment nut 224 and the outer shell body 2232. By using the function of the lead screw pair that can convert linear motion and rotational motion into each other, the linear motion of the adjustment nut 224 is converted into the rotational motion of the outer shell body 2232, thereby forming the telescopic motion of the first passive section 221 and the second passive section 222.

[0058] In order to enhance stability and improve load-bearing capacity, a more reliable implementation manner can also be used. In this implementation manner, threads are provided on the outer side of the outer shell body 2232, and the adjustment nut 224 is arranged on the outer circular surface of the active section 223. Please refer to Figure 5 , the adjustment nut 224 includes an annular nut housing 2241, planet rings 2242, and a plurality of stud bolts 2243. Two planet rings 2242 are respectively rotatably arranged inside both ends of the nut housing 2241. The plurality of stud bolts 2243 are annularly distributed on the inner circumferential direction of the nut housing 2241, and both ends of the stud bolts 2243 are respectively rotatably connected to the planet rings 2242. The middle sections of the stud bolts 2243 and the nut housing 2241 are threaded sections 225 that cooperate with each other. Both ends of the stud bolts 2243 are gear sections 226. The gear sections 226 are engaged with the tooth rings of the planet rings 2242. Threads are also superimposed on the gear sections 226 of the stud bolts 2243, and the specifications of the threads are the same as those of the threaded sections 225. The threads of the plurality of stud bolts 2243 are all engaged with the threads on the outer side of the outer shell body 2232. A protruding force-bearing ring 22411 is provided on the outer circular surface of the nut housing 2241.

[0059] The principle of the above embodiment is that an external device clamps the force-bearing ring 22411 and then pushes and pulls along the axial direction of the steel support 2, so that the entire adjusting nut 224 obtains a force along its axial direction. In the adjusting nut 224, a plurality of studs 2243 in the middle layer cooperate with the nut housing 2241 in the outer layer and the inner rod body 2231 in the center at the same time. When the nut housing 2241 generates an axial movement, the threads on the nut housing 2241 will drive the studs 2243 to rotate, and the studs 2243 will correspondingly drive the inner rod body 2231 to rotate. In this process, the studs 2243 will roll between the internal threads of the nut housing 2241 and the external threads of the inner rod body 2231. Therefore, planetary rings 2242 are provided at both ends of the studs 2243 and the adjusting nut 224, enabling the entire adjusting nut 224 to work properly. It should be noted that in order to achieve a better two-way transmission effect, a thread like a T-shaped lead screw can be used. The rotation of the lead screw can be converted into the translation of the nut, and the translation of the nut can also be converted into the rotation of the lead screw. A non-self-locking thread fitting method can also be used. Specifically, when the thread lead angle is greater than the equivalent friction angle, self-locking will not occur. During the rotation of the inner rod body 2231, the first passive section 221 and the second passive section 222 connected to both ends of the inner rod body 2231 will expand and contract, thereby adjusting the length and axial force of the entire steel support 2. In this embodiment, the lead of the thread of the adjusting nut 224 can be selected to be smaller. Especially compared with the lead of an ordinary ball screw that must match the diameter of the ball, the thread lead in this embodiment can be reduced by several times or even dozens of times. In the process of converting the linear force received by the adjusting nut 224 into the rotational force of the inner rod body 2231 and then into the elongation of the steel support 2, the force is all transmitted by the thread, and the force transmission is more delicate, and the control of the elongation and axial force of the steel support 2 is more precise; at the same time, the force transmission process between the adjusting nut 224 and the inner rod body 2231 is all line contact, which can provide a large thrust. The contact between the inner rod body 2231 and the first passive section 221 and the second passive section 222 is surface contact. In this implementation scenario, the overall structural stability of the steel support 2 can be ensured. In addition, the inner rod body 2231 and the outer housing 2232 form a sandwich structure and are sandwich-docked with the first passive section 221 and the second passive section 222, and the mechanical properties are even stronger than other parts of the steel support 2. Generally speaking, the method in this embodiment can not only generate sufficient axial force compensation but also ensure the reliability of the entire structure of the steel support 2.

[0060] This embodiment can be combined with Figure 3 and Figure 4 for comparison. As Figure 3 shown, flexible corrugated sleeves 22412 are provided at both ends of the nut housing 2241, and the corrugated sleeves 22412 cover the threads on the outer housing 2232 of the active section 223 inside. And Figure 4 is a schematic diagram of the state without the corrugated sleeve 22412 provided. Please combineFigure 1 , this support system is applied to the scenario of foundation pit excavation. During the construction process, it may encounter the situation where the mud and slag outside the foundation pit fall onto the steel support 2, or it may encounter rainy days, etc. If sediment, water vapor, etc. stay on the steel support 2, especially in the area where the external thread of the outer shell 2232 is connected to the adjusting nut 224, it may cause corrosion, jamming, etc., which will affect the normal operation of the steel support 2. Through the setting of the corrugated sleeve 22412, it can effectively prevent sediment and rainwater from entering, and because the corrugated sleeve 22412 can shrink, it will not affect the length adjustment of the steel support 2, and good beneficial effects can be produced.

[0061] Please refer to this embodiment Figure 4 , the inner rod body 2231 is provided with a first pressure hole 22311, a second pressure hole 22312 and a third pressure hole 22313 that penetrate through. The first pressure hole 22311 coincides with the axis of the inner rod body 2231; the second pressure hole 22312 is parallel to the axis of the inner rod body 2231 and is located in the area between the inner rod body 2231 and the outer shell 2232; the third pressure hole 22313 is along the radial direction of the inner rod body 2231 and is located in the middle section area of the active section 223; the first pressure hole 22311, the first pressure hole 22311 and the third pressure hole 22313 communicate with each other and communicate with the outside through the third pressure hole 22313. Even if the third pressure hole 22313 is located in the meshing area of the adjusting nut 224 and the outer shell 2232, because the stud 2243 in the adjusting nut 224 is in line contact with the external thread surface of the outer shell 2232, it will not block the third pressure hole 22313, and then the third pressure hole 22313 communicates with the outside through the assembly gap of the adjusting nut 224. In order to enhance the communication effect, ventilation holes can also be opened on the adjusting nut 224. As mentioned in the previous embodiment, the inner rod body 2231 is in threaded surface contact with the first passive section 221 and the second passive section 222. Therefore, as Figure 4 In the process of adjustment, the cavity area between the inner rod body 2231 and the first passive section 221 and the second passive section 222 may form a closed area, and the gas pressure is difficult to discharge, which forms a reaction force on the adjustment force and affects the adjustment effect and accuracy. Through the setting of multiple pressure holes, the internal closed interval is connected to the outside, effectively avoiding the above problems and improving the adjustment effect and accuracy. In addition, the lubricating oil can be injected into the pressure holes, so that the lubricating oil enters the threaded connection surface and the smooth guiding surface between the active section 223 and the passive section from the pressure holes, thereby reducing friction and improving the effect.

[0062] Please refer to this embodiment Figure 3, the steel support 2 further includes at least one extension section 23 which is arranged inside the steel support 2. The flexible section 21, the extension section 23 and the adjustment section 22 adopt a unified connection structure with each other. The extension section 23 can greatly change the length of the steel support 2, and the unified connection mode among the flexible section 21, the extension section 23 and the adjustment section 22 can enhance the adaptability of the steel support system and reduce the implementation cost.

[0063] Please refer to this embodiment Figure 6 , the quick installation and disassembly structure 1 includes a first force transmission seat 11, a steel girt 12 and a second force transmission seat 13. A plurality of first force transmission seats 11 are arranged at the same height on the side wall of the foundation pit at intervals. The steel girt 12 is arranged on the top of the plurality of first force transmission seats 11. One side of the steel girt 12 is aligned with the side wall of the foundation pit, and a plurality of second force transmission seats 13 are arranged at intervals on the other side. The second force transmission seats 13 on both sides of the foundation pit are arranged oppositely. The second force transmission seat 13 includes a force receiving plate 131 and a limiting plate 132. The force receiving plate 131 is fixedly connected to the steel girt 12. There are two limiting plates 132. The two limiting plates 132 are respectively arranged at both ends of the force receiving plate 131 and are parallel to the force receiving plate 131. The area surrounded by the force receiving plate 131 and the limiting plate 132 is a limiting area 133. The size of the limiting area 133 is matched with the end of the fixed head 211, and chamfers 1331 are provided on the top side lines of the limiting area 133. In this embodiment, when the steel support 2 is initially installed, the steel support 2 can be assembled according to the distance between the opposite second force transmission seats 13 on both sides of the foundation pit, and then it can be lifted by a crane and placed into the two second force transmission seats 13 at one time. Due to the function of the chamfer 1331, even if there is a little error in the length of the steel support 2 or a little error in the hoisting position of the end of the steel support 2, the steel support 2 can be placed more conveniently, and then it can be adjusted to extend to form a support and axial force compensation state. The force receiving plate 131 and the limiting plate 132 enclose the limiting area 133 and limit the end of the steel support 2, and it can only move in the upward direction. On the one hand, it ensures the installation stability in the normal working state; on the other hand, after the construction is completed, the steel support 2 can be directly removed by lifting upward, which improves the construction efficiency. Generally speaking, the construction process is simplified, the installation is reliable, and both the initial installation and the subsequent disassembly process are greatly simplified. Especially compared with the prior art in which one end still needs to be fixedly connected, the construction difficulty is significantly reduced and the construction safety is improved.

[0064] Please refer to this embodiment Figure 2, a distance sensor 14 is installed on the first force transmission seat 11. The distance sensor 14 is installed inside the first force transmission seat 11 and is located at the bottom of the steel support 2. The first force transmission seat 11 and the steel support 2 can play a protective role to prevent sediment and rainwater from falling and affecting the reliability and accuracy of the distance sensor 14. By measuring the distance between the two foundation pit sides with the distance sensor 14, on the one hand, the dimensions of each position of the foundation pit can be monitored in real time to evaluate the quality of the foundation pit support; on the other hand, a closed loop can also be formed with the adjusting device, and the measured value and the adjusting value can be mutually verified and matched, which can effectively improve the adjusting quality and effect of the elongation and axial force.

[0065] Further, please refer to Figure 7 , a notch 213 is provided at the sliding structure between the movable head 212 and the fixed head 211. There are two main forces acting on the steel support 2, one is the axial force, and the other is its own gravity. Both of these forces will be transmitted from the fixed head 211 to the foundation pit side. The contact section between the fixed head 211 and the movable head 212 is set into a sheet-like structure, and both of these forces are along the thickness direction of the sheet-like structure, which conforms to the mechanical compression principle and has better structural stability. The notch 213 between the sheet-like structures can allow air to pass through, which can prevent a high-pressure gas closed space from being formed inside the movable head 212 and the fixed head 211, affecting the sliding effect between them and further affecting the axial force adjustment.

[0066] Further, an axial force sensor 214 is provided at the docking position between the movable head 212 and the fixed head 211, and the relevant wire harness can be connected from the notch 213. Similar to the distance sensor 14, the axial force sensor 214 can monitor the axial force inside the steel support 2 in real time, form a closed loop with the adjusting device, and increase the adjusting accuracy of the adjusting device. On the other hand, by comparing the detection data of the two axial force sensors 214 at both ends of the steel support 2, the installation condition of the steel support 2 can also be effectively evaluated. If the data of the two axial force sensors 214 differ greatly, it means that there is a problem with the installation of the steel support 2. For example, it may not be perpendicular to the foundation pit sides on both sides. At this time, the support quality may be affected, and the installation of the steel support 2 needs to be checked. Generally speaking, the axial force sensor 214 can not only provide a basis for how much axial force compensation is adjusted, but also ensure the accuracy of the provided axial force compensation. At the same time, it can also check the accuracy of the installation of the steel support 2, and can also monitor the axial force change on both sides of the foundation pit in real time, monitoring and improving the safety of the foundation pit construction.

[0067] For this embodiment, please refer to Figure 1 and Figure 2, the first foundation pit side and the second foundation pit side are both provided with a first suspension structure 31 and a second suspension structure 32. The first suspension structure 31 is connected between the steel waling 12 and the foundation pit side, which can prevent accidents caused by the accidental fall of the steel waling 12 during the construction process, especially during the construction of the steel support 2 and the steel waling 12; the second suspension structure 32 is connected between the fixed head 211, the swivel head 212 and the foundation pit side. Since the fixed head 211 and the swivel head 212 are slidably connected, during the hoisting, installation and disassembly of the steel support 2, the two fixed heads 211 are suspended at both ends of the steel support 2. Once the steel support 2 is in a situation where one side is higher and the other side is lower during the hoisting process, the fixed head 211 on the lower side may slide and fall to the bottom of the foundation pit, which will bring adverse consequences to the safety of construction personnel and the construction progress. In this embodiment, the second suspension structure 32 can effectively prevent the above situation. After the construction is completed, fixing the end of the second suspension structure 32 on the foundation pit side can also prevent the steel support 2 and its components from falling, which not only improves the stability of the support system itself but also ensures the safety of construction workers.

[0068] In summary, the present invention effectively overcomes various drawbacks in the prior art and has high industrial utilization value.

[0069] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A steel support system for foundation pit support, comprising a first foundation pit side, a second foundation pit side, and a steel support (2) disposed between the first foundation pit side and the second foundation pit side, characterized in that: Quick - installation and quick - disassembly structures (1) are oppositely arranged on both the first foundation pit side and the second foundation pit side, and both ends of the steel support (2) are respectively connected to the first foundation pit side and the second foundation pit side through the quick - installation and quick - disassembly structures (1); The steel support (2) includes an adjustable section (21) and an adjusting section (22); There are two adjustable sections (21), which are respectively arranged at both ends of the steel support (2) and connected to the quick - installation and quick - disassembly structure (1). The adjustable section (21) includes a fixed head (211) and a movable head (212). The fixed head (211) is connected to the quick - installation and quick - disassembly structure (1), the movable head (212) is arranged at the end of the body of the steel support (2), and the movable head (212) is in sliding fit with the fixed head (211), and the sliding direction is the axial direction of the steel support (2); The adjusting section (22) is arranged inside the steel support (2), and the adjusting section (22) can be extended or shortened; The adjusting section (22) includes a first passive section (221), a second passive section (222), an active section (223), and an adjusting nut (224); The first passive section (221) and the second passive section (222) are oppositely arranged and have coincident axes. Internal threads are provided inside both the first passive section (221) and the second passive section (222) and the thread rotation directions are opposite. The outer circular surfaces of the first passive section (221) and the second passive section (222) are both smooth guiding surfaces; The active section (223) includes an inner rod body (2231) and an outer shell body (2232); External threads are provided on the inner rod body (2231). The external threads at both ends of the inner rod body (2231) have opposite rotation directions and are respectively in threaded fit with the internal threads of the first passive section (221) and the second passive section (222); The inner side of the outer shell body (2232) is a smooth guiding surface and is in fit with the outer circular surfaces of the first passive section (221) and the second passive section (222). Threads are provided on the outer side of the outer shell body (2232); The adjusting nut (224) is arranged on the outer circular surface of the active section (223). The adjusting nut (224) includes an annular nut housing (2241), planet rings (2242), and a plurality of studs (2243); The two planet rings (2242) are respectively rotatably arranged inside both ends of the nut housing (2241); The plurality of studs (2243) are annularly distributed circumferentially inside the nut housing (2241), and both ends of the studs (2243) are respectively rotatably connected to the planet rings (2242); The middle sections of the stud (2243) and the nut housing (2241) are mutually mating threaded sections (225). The two ends of the stud (2243) are gear sections (226). The gear sections (226) are engaged with the tooth rings of the planetary rings (2242). A thread is further superimposed on the gear section (226) of the stud (2243), and the specification of the thread is the same as that of the threaded section (225). The threads of multiple studs (2243) are all mated with the threads on the outer side of the outer housing (2232); A protruding force-receiving ring (22411) is provided on the outer circumferential surface of the nut housing (2241).

2. A steel support system for foundation pit support according to claim 1, wherein: Flexible corrugated sleeves (22412) are provided at both ends of the nut housing (2241), and the corrugated sleeves (22412) shield the threads on the outer housing (2232) of the active section (223) inside.

3. A steel support system for foundation pit support according to claim 1, wherein: The inner rod body (2231) is provided with a first pressure hole (22311), a second pressure hole (22312) and a third pressure hole (22313) that penetrate through; The first pressure hole (22311) coincides with the axis of the inner rod body (2231); The second pressure hole (22312) is parallel to the axis of the inner rod body (2231) and is located in the area between the inner rod body (2231) and the outer housing (2232); The third pressure hole (22313) is in the radial direction of the inner rod body (2231) and is located in the middle section area of the active section (223); The first pressure hole (22311), the first pressure hole (22311) and the third pressure hole (22313) communicate with each other.

4. A steel support system for foundation pit support according to claim 1, characterized in that, The steel support (2) further includes at least one extension section (23). The extension section (23) is arranged inside the steel support (2). The flexible section (21), the extension section (23) and the adjustment section (22) adopt a unified connection structure with each other.

5. A steel support system for foundation pit support according to claim 1, wherein: The quick installation and disassembly structure (1) includes a first force transmission seat (11), a steel waling (12) and a second force transmission seat (13); Multiple first force transmission seats (11) are arranged at the same height on the side wall of the foundation pit at intervals. The steel waling (12) is arranged on the tops of multiple first force transmission seats (11). One side of the steel waling (12) is aligned with the side wall of the foundation pit, and multiple second force transmission seats (13) are arranged at intervals on the other side; The second force transmission seat (13) includes a force receiving plate (131) and a limiting plate (132). The force receiving plate (131) is fixedly connected to the steel collar (12). There are two limiting plates (132), and the two limiting plates (132) are respectively arranged at both ends of the force receiving plate (131) and are parallel to the force receiving plate (131). The area surrounded by the force receiving plate (131) and the limiting plate (132) is a limiting area (133). The size of the limiting area (133) is matched with the end of the fixed head (211), and chamfers (1331) are provided on the top side lines of the limiting area (133).

6. A steel support system for foundation pit support according to claim 5, characterized in that, A distance sensor (14) is installed on the first force transmission seat (11).

7. A steel support system for foundation pit support according to claim 1, characterized in that, A notch (213) is provided at the sliding structure of the movable head (212) and the fixed head (211).

8. A steel support system for foundation pit support according to claim 7, characterized in that, An axial force sensor (214) is arranged at the docking part of the movable head (212) and the fixed head (211).

9. The steel support system for foundation pit support according to claim 5, characterized in that: Both the first foundation pit side and the second foundation pit side are provided with a first suspension structure (31) and a second suspension structure (32); The first suspension structure (31) is connected between the steel collar (12) and the foundation pit side; The second suspension structure (32) is connected between the fixed head (211), the movable head (212) and the foundation pit side.

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