Prestress adjusting device of steel support for foundation pit support

Abstract

The application provides a prestress adjusting device of a steel support for foundation pit support, belongs to the field of foundation pit support, and is used for adjusting the support axial force of the steel support. In the prior art, a support axial force adjusting device is arranged on each steel support, the cost of the whole support system is high, and the economic benefit is low. In the application, the two ends of the steel support are connected to the side of the foundation pit through steel enclosing purlins, the steel support is provided with an adjusting section which can be controlled to be elongated or shortened by an adjusting part, the prestress adjusting device comprises the adjusting part, the adjusting part comprises a sliding seat, an expansion joint and a clamping seat, the sliding seat is slidingly connected to the steel enclosing purlin, and the adjusting part can be switched between different steel supports. The clamping seat comprises a seat body and a clamping arm, the clamping arm can be arc-shaped or linear, when the clamping arm is arc-shaped, the clamping arm clamps the steel support, at this time, the expansion joint is expanded or contracted to adjust the axial force of the steel support; when the clamping arm is linear, the adjusting device can be slid to another steel support. In summary, the same adjusting device can realize the axial force adjustment of multiple steel supports, and the economic benefit is high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of foundation pit support, in particular to a prestress adjusting device for steel support of foundation pit support. BACKGROUND

[0002] With the development of city construction and development, the development and utilization of underground space is more and more high, and the excavation area and depth of foundation pit are also increasing day by day. The scientificity and rationality of the horizontal structure design of foundation pit support have a huge impact on the subsequent main body engineering construction. Reasonably calculating the support axial force is not only conducive to improving the economy of the support structure, but also convenient for real-time evaluation of the safety performance of the support in the process of foundation pit excavation. However, for large foundation pit, because the support range is large, more steel supports are used, and the support axial force will change continuously with the excavation, so it is difficult to meet the support requirements only by pre-calculating the axial force and designing the length of the steel support.

[0003] However, the deformation control effect of the foundation pit is closely related to the safety of the enclosure structure, so in the design of the enclosure structure, the existing technology often designs a support axial force adjusting device, or called support axial force compensation device, on each steel support. In the process of foundation pit excavation, the axial force of each steel support is dynamically adjusted through the support axial force adjusting device, so as to realize the most reasonable support axial force distribution state.

[0004] For large foundation pit, although this method can better control the overall support effect of the foundation pit, because each steel support is provided with a servo adjusting device, not only the cost of the whole support system is greatly increased, but also the installation and disassembly process of the steel support is complicated. In summary, the economic benefit is low. SUMMARY

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a prestress adjusting device for steel support of foundation pit support, which is used to solve the problem that the comprehensive economic benefit of the steel support system is low due to the independent setting of servo adjusting device on each steel support in the prior art.

[0006] To achieve the above-mentioned purpose and other related purposes, the present application provides a prestress adjusting device for steel support of foundation pit support, which comprises a first foundation pit side, a second foundation pit side, a steel enclosing purlin, a steel support and an adjusting part. The two ends of the steel support are connected to the first foundation pit side and the second foundation pit side through the steel enclosing purlin respectively.

[0007] An adjusting section is arranged in the steel support, and the adjusting section can be elongated or shortened.

[0008] The axis of the adjusting part is parallel to the axis of the steel support, and the adjusting part comprises a sliding seat, an extension piece and a clamping seat.

[0009] The sliding seat and the clamping seat are arranged at two ends of the telescopic member respectively, the telescopic member comprises an execution end and a housing end, the execution end is connected with the clamping seat, the housing end is connected with the sliding seat, and the sliding seat is further connected with the steel enclosing purlin in a sliding mode;

[0010] The clamping seat comprises a seat body and clamping arms arranged symmetrically at two sides of the seat body, and a first clamping area is arranged at the bottom of the seat body;

[0011] The clamping arm comprises a force transmission member, a control cable and two clamping members, the force transmission member is in a reverse "U" shape in cross section and one end thereof is rotatably connected with the end of the seat body, the two clamping members are arranged at the inner side of the force transmission member in a head-to-tail mode, the clamping member is in a double-layer structure and a second clamping area is arranged in the middle layer area, one end of the control cable is connected with the clamping arm and the other end thereof passes through the seat body, when the control cable is in a relaxed state, the two clamping arms and the seat body are connected in an arc shape, and when the control cable is in a tensioned state, the two clamping arms are separated from the steel support.

[0012] Optionally, one connecting rod is arranged at each end of the back side of the second clamping area, and the control cable comprises a first cable and a second cable;

[0013] The end of the first cable is connected with the outer side of the back of the force transmission member;

[0014] The end of the second cable is connected with the outermost clamping member, sequentially passes below the connecting rods at two ends of the clamping members and then reaches the seat body.

[0015] Optionally, the clamping seat further comprises two cable adjusting mechanisms arranged at the seat body, the cable adjusting mechanism comprises a power source, a driving shaft and a driven shaft, the driving shaft is driven to rotate by the power source, and the driven shaft is driven by the driving shaft through a gear pair and rotates in the opposite direction;

[0016] The two first cables are connected with the driving shaft and the driven shaft of one of the cable adjusting mechanisms respectively, and the two second cables are connected with the driving shaft and the driven shaft of the other cable adjusting mechanism respectively.

[0017] Optionally, one connecting rod is arranged at each end of the back side of the second clamping area of the clamping member, the control cable comprises a third cable, and the inner side of the back of the force transmission member is provided with a wire hole;

[0018] The end of the third cable is connected with the outermost clamping member, sequentially passes below the connecting rods at two ends of the clamping members, then passes through the wire hole, next passes below the connecting rods at two ends of the clamping members, and finally reaches the seat body.

[0019] Optionally, the clamping seat further comprises a cable adjustment mechanism arranged on the seat body, the cable adjustment mechanism comprising a power source, a driving shaft and a driven shaft, the driving shaft being driven to rotate by the power source, the driven shaft being driven by the driving shaft through a gear pair and rotating in the opposite direction.

[0020] Two of the third cables are connected to the driving shaft and the driven shaft of the cable adjustment mechanism respectively.

[0021] Optionally, the shell end of the telescopic member is connected with a flexible cable at one end, and the other end of the flexible cable is slidingly connected to the side of the foundation pit.

[0022] Optionally, the adjusting part is at least two, and the walking part is further included.

[0023] The axis of the walking part is perpendicular to the axis of the steel support, the bottom of the walking part is connected to the steel support, the bottom of the adjusting part is connected to the top of the walking part through a first electromagnet, and the walking part carries the adjusting part to switch positions on the plurality of steel supports.

[0024] Optionally, the walking part comprises a frame body, a walking plate chain and a switching mechanism.

[0025] The frame body is provided with controllable adsorption mechanisms at both ends, which can be adsorbed to the steel support.

[0026] The walking plate chain is arranged inside the frame body, and the upper layer of the walking plate chain is lower than the top of the frame body, and the lower layer of the walking plate chain is higher than the bottom of the frame body.

[0027] The switching mechanism is arranged between the upper layer and the lower layer of the walking plate chain, the switching mechanism comprising a switching frame, support wheels and a lifter, a plurality of support wheels being rotatably arranged on the switching frame, the switching frame being connected to the lifter, and the lifter being capable of adjusting the height of the switching frame.

[0028] Optionally, the frame body and the switching frame are made of aluminum.

[0029] Optionally, the chain piece unit of the walking plate chain is a double-layer structure, the outer layer being rubber and the inner layer being iron sheet.

[0030] As described above, the prestress adjusting device for the steel support of the foundation pit support has at least the following beneficial effects:

[0031] The prestress adjusting device has high economic benefits and can significantly reduce the cost of the foundation pit supporting system. In the prestress adjusting device, the two ends of the steel support are connected to the side of the foundation pit through the steel enclosing purlin, and the adjusting section capable of being controlled to be elongated or shortened by the adjusting part is arranged in the steel support. The adjusting part comprises a sliding seat, an expansion piece and a clamping seat, the sliding seat and the clamping seat are arranged at the two ends of the expansion piece respectively, and the sliding seat is slidingly connected to the steel enclosing purlin. The clamping seat comprises a seat body and clamping arms symmetrically arranged on the two sides of the seat body, the clamping arm comprises a force transmission piece, a control cable and two clamping pieces, the two clamping pieces are oppositely arranged on the inner side of the force transmission piece, one end of the control cable is connected to the clamping arm, the tightness of the control cable is adjusted, and the clamping arm can be in an arc shape or a straight line shape. When the clamping arm is in the arc shape, the clamping arm has the clamping effect on the circumferential surface of the steel support, the length of the steel support is adjusted through the expansion piece, and the axial force size is changed; when the clamping arm is in the straight line shape, the sliding seat side slides to enable the adjusting device to slide above another steel support, and the axial force of the other steel support is adjusted. In summary, the same adjusting device can adjust the axial force of multiple steel supports, the number of servo devices can be effectively reduced, the cost of the whole supporting system is obviously improved, and good economic benefits are obtained. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The whole schematic diagram of the present application is shown.

[0033] Figure 2 The whole schematic diagram of the present application is shown. Figure 1 The local enlarged schematic diagram of A in the present application is shown.

[0034] Figure 3 The schematic diagram of the adjusting part of the present application is shown.

[0035] Figure 4 The schematic diagram of the clamping seat of the present application in the arc shape is shown.

[0036] Figure 5 The sectional view schematic diagram of the clamping seat of the present application in the arc shape is shown.

[0037] Figure 6 The schematic diagram of the clamping seat of the present application in the straight line shape is shown.

[0038] Figure 7 The sectional view schematic diagram of the clamping seat of the present application in the straight line shape is shown.

[0039] Figure 8 The cable adjusting mechanism schematic diagram of the clamping seat of the present application is shown.

[0040] Figure 9 The schematic diagram of the walking part and the adjusting part of the present application is shown.

[0041] Figure 10 The schematic diagram of the adjusting part of the present application in the whole state is shown.

[0042] Figure 11 The figure shows the profile view of the adjusting part of the application.

[0043] Figure 12 The figure shows the schematic view of the walking part and the adjusting part of the application.

[0044] Figure 13 The figure shows the schematic view of the adsorption mechanism of the application.

[0045] Figure 14 The figure shows the profile view of the adjusting segment.

[0046] Figure 15 The figure shows the profile view of the adjusting nut.

[0047] Wherein: the steel enclosing purlin 12, the steel support 2, the adjusting segment 22, the adjusting part 5, the sliding seat 51, the telescopic part 52, the execution end 521, the housing end 522, the flexible cable 523, the first electromagnet 524, the clamping seat 53, the seat body 531, the first clamping area 5311, the clamping arm 532, the force transmission part 5321, the first cable 53221, the second cable 53222, the third cable 53223, the clamping part 5323, the second clamping area 53231, the connecting rod 53232, the cable adjusting mechanism 533, the power source 5331, the driving shaft 5332, the driven shaft 5333, the gear pair 5334, the walking part 6, the frame body 61, the adsorption mechanism 611, the walking plate chain 62, the upper layer chain 6211, the lower layer chain 6212, the switching mechanism 63, the switching frame 631, the support wheel 632, the lifter 633. DETAILED DESCRIPTION

[0048] The embodiments of the present application will be described in detail by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0049] Please refer to Figures 1 to 15 It should be understood that the structure, proportion, size, etc. shown in the drawings of the 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 defined conditions that the present application can be implemented, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that the present application can produce, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the specification are only for the convenience of clear description, and are not used to limit the scope of the present application, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation of the present application.

[0050] The following embodiments are only for illustration. Various embodiments can be combined, which are not limited to the following single embodiment.

[0051] The present embodiment refers to Figures 1-7 The prestress adjusting device for the steel support of the foundation pit support provided by the present application comprises a first foundation pit side, a second foundation pit side, a steel enclosing purlin 12, a steel support 2 and an adjusting part 5. The two ends of the steel support 2 are connected to the first foundation pit side and the second foundation pit side through the steel enclosing purlin 12. The steel support 2 is provided with an adjusting section 22. The adjusting section 22 can be elongated or shortened. The length of the entire steel support 2 is changed through the length change of the adjusting section 22, and then the supporting axial force of the steel support 2 on the first foundation pit side and the second foundation pit side of the two sides of the foundation pit is changed. When installed, the axis of the adjusting part 5 is parallel to the axis of the steel support 2. The adjusting part 5 comprises a sliding seat 51, an expansion piece 52 and a clamping seat 53. The sliding seat 51 and the clamping seat 53 are respectively arranged at the two ends of the expansion piece 52. The expansion piece 52 comprises an execution end 521 and a housing end 522. The execution end 521 is connected with the clamping seat 53. The clamping seat 53 is connected with the adjusting section 22 in the steel support 2. Then the execution end 521 pushes or pulls the clamping seat 53 and the adjusting section 22. The adjusting section 22 changes the length correspondingly to change the axial force. The housing end 522 is connected with the sliding seat 51. The sliding seat 51 is also slidingly connected to the steel enclosing purlin 12. Therefore, the entire adjusting part 5 can slide along the steel enclosing purlin 12, and then reach different positions of the steel support 2 to adjust the specific steel support 2. The clamping seat 53 comprises a seat body 531 and clamping arms 532 symmetrically arranged on both sides of the seat body 531. The seat body 531 is provided with a first clamping area 5311 at the bottom. The first clamping area 5311 is matched with the structure on the adjusting section 22. Specifically, the clamping arm 532 comprises a force transmission piece 5321, a control rope and two clamping pieces 5323. The force transmission piece 5321 is in the shape of an inverted “U” and one end is rotatably connected to the end of the seat body 531. The two clamping pieces 5323 are oppositely arranged inside the force transmission piece 5321. The clamping piece 5323 is in a double-layer structure and the middle layer area is a second clamping area 53231. One end of the control rope is connected to the clamping arm 532 and the other end passes through the seat body 531. When the control rope is in a relaxed state, the two clamping arms 532 and the seat body 531 are connected in an arc shape to embrace and clamp the steel support 2, which is convenient for pushing and pulling along the axial direction of the steel support 2. When the control rope is in a tensioned state, the two clamping arms 532 are separated from the steel support 2. The two clamping arms 532 and the seat body 531 are connected in a nearly straight line state. At this time, the clamping seat 53 can move in the direction of the steel enclosing purlin 12 to reach different steel supports 2 to adjust different steel supports 2.

[0052] The main implementation steps of the above embodiment are as follows:

[0053] First, install the steel support 2. According to Figure 1The normal foundation pit construction is shown, and each steel support 2 is hoisted to the first foundation pit side and the second foundation pit side, and the installation of each steel support 2 is ensured to be horizontal. At the same time, it should also be noted that the steel support 2 should be provided with an adjusting section 22, and the adjusting section 22 is a special structure, and the change of the overall length of the adjusting section 22 can be realized by pushing or pulling the structure of the adjusting section 22 through the adjusting part 5, so as to realize the change of the length of the whole steel support 2, so as to realize the adjustment of the support axial force.

[0054] Second step, install the adjusting part 5. According to Figure 2 The sliding seat 51 at the tail end of the adjusting part 5 is slidably installed on the steel enclosing purlin 12, the overall axis of the adjusting part 5 is perpendicular to the steel enclosing purlin 12 and parallel to the steel support 2, and the clamping seat 53 is arranged at the head of the adjusting part 5, and the distance from the foundation pit side is approximately equal to the distance of the adjusting section 22 on the steel support 2 from the foundation pit side.

[0055] Third step, axial force adjustment. Before starting, the state of the clamping seat 53 should be controlled to keep it in an approximate straight line state as shown in Figure 6 In this state, the two clamping arms 532 in the clamping seat 53 are both separated from the steel support 2, at this time the adjusting part 5 can slide along the steel enclosing purlin 12, and the clamping arms 532 will not collide with the steel support 2 in the sliding process. Please refer to Figure 3 and Figure 4 After the adjusting part 5 slides above the steel support 2 to be adjusted, the state of the clamping seat 53 is controlled again, so that the two clamping arms 532 are both bent to embrace the steel support 2. Then, the extension and retraction of the execution end 521 pushes or pulls the structure on the adjusting section 22, so that the length of the whole adjusting section 22 and the steel support 2 changes, and the effect of axial force adjustment is realized.

[0056] Fourth step, dynamic and real-time adjustment of the axial force between multiple steel supports 2. After the axial force of a certain steel support 2 is adjusted, the axial force of the steel support 2 adjacent to it may also change, and the axial force of the steel support 2 may also change during the normal construction of the foundation pit, so it may be necessary to adjust each steel support 2 in a normal manner. The specific way is as in step three, the adjusting part 5 can change its position by sliding to match different steel supports 2, and then the clamping seat 53 clamps the adjusting structure of the corresponding steel support 2 to push or pull, so as to realize the adjustment.

[0057] In order to facilitate the understanding of the above scheme, the structure of the adjusting section 22 in the steel support 2 is described. Please refer to Figure 14 and Figure 15The adjusting section 22 comprises 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 coaxial, the interiors of the first passive section 221 and the second passive section 222 are provided with internal threads and the thread rotation directions are opposite, and the outer circular surfaces of the first passive section 221 and the second passive section 222 are smooth guide surfaces. The active section 223 comprises an inner rod body 2231 and an outer shell 2232, the inner rod body 2231 is provided with external threads, the external thread rotation directions of the two ends of the inner rod body 2231 are opposite, and the external threads are matched with the internal threads of the first passive section 221 and the second passive section 222 respectively, and the inner side of the outer shell 2232 is a smooth guide surface and is matched with the outer circular surfaces of the first passive section 221 and the second passive section 222. The outer side of the outer shell 2232 is provided with threads. The adjusting nut 224 is arranged on the outer circular surface of the active section 223, please refer to Figure 15The adjusting nut 224 comprises a ring-shaped nut housing 2241, planet rings 2242 and a plurality of studs 2243. The two planet rings 2242 are respectively arranged on the inner side of the two ends of the nut housing 2241, and the plurality of studs 2243 are arranged in a ring shape on the inner side of the nut housing 2241 in a circumferential direction, and the two ends of the stud 2243 are respectively connected to the planet ring 2242. The middle section of the stud 2243 and the nut housing 2241 is a threaded section 225, the two ends of the stud 2243 are gear sections 226, the gear sections 226 are engaged with the gear ring of the planet ring 2242, and the gear sections 226 of the stud 2243 are additionally provided with threads, and the specifications of the threads are the same as those of the threaded section 225. The threads of the plurality of studs 2243 are matched with the threads on the outer side of the outer housing 2232. The outer circular surface of the nut housing 2241 is provided with a protruding stress ring 22411. The principle of elongation or shortening is that the stress ring 22411 is clamped by the adjusting part 5, and then pushed and pulled along the axis direction of the steel support 2, so that the entire adjusting nut 224 obtains force along the axis direction. In the adjusting nut 224, the plurality of studs 2243 in the middle layer are matched with the nut housing 2241 in the outer layer and the inner rod body 2231 in the center. When the nut housing 2241 moves along the axis, the threads on the nut housing 2241 will drive the stud 2243 to rotate, and the stud 2243 will drive the inner rod body 2231 to rotate correspondingly. In this process, the stud 2243 will roll between the inner thread of the nut housing 2241 and the outer thread of the inner rod body 2231, so that the stud 2243 and the two ends of the adjusting nut 224 are provided with the planet ring 2242, so that the entire adjusting nut 224 can work normally. It should be noted that in order to achieve better bidirectional transmission effect, a T-shaped screw can be used, the rotation of the 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 screw. In addition, a thread matching without self-locking can also be used. Specifically, when the thread rise angle is greater than the equivalent friction angle, self-locking will not occur. In the process of rotating the inner rod body 2231, the first passive section 221 and the second passive section 222 connected to the two ends of the inner rod body 2231 are stretched and contracted, so as to adjust the length and axial force of the entire steel support 2.In the scheme where the adjusting section 22 cooperates with the adjusting part 5, the pitch of the thread of the adjusting nut 224 can be selected to be smaller, especially compared to the pitch of the common ball screw, which must match the diameter of the ball. In the scheme, the pitch of the thread can be reduced by several times or even dozens of times. In the process of converting the linear force borne by the adjusting nut 224 into the rotational force of the inner rod body 2231 and further into the elongation of the steel support 2, the force is entirely transmitted by the thread, and the force transmission is more delicate, and the control of the elongation and the axial force of the steel support 2 is more accurate. At the same time, the force transmission process between the adjusting nut 224 and the inner rod body 2231 is entirely linear contact, which can provide a larger thrust force. The contact between the inner rod body 2231 and the first passive section 221 and the second passive section 222 is surface contact, which can ensure the overall structural stability of the steel support 2 in the embodiment.

[0058] In summary, the scheme in the above example can generate sufficient axial force compensation and ensure the reliability of the overall structure of the steel support 2. In particular, the same adjusting part 5 can be used to adjust the axial force of multiple steel supports 2, which can effectively reduce the number of servo devices, significantly improve the cost of the overall support system, and has good economic benefits.

[0059] It should be noted that the structure for realizing the length change of the adjusting section 22 is only one possible implementation, and in actual implementation, there can be many ways. For example, even if the adjusting nut 224 is a common screw nut, when the nut is pushed, it can also be reversed to drive the driving section 223 to rotate, thereby forming the length change of the adjusting section 22.

[0060] The present embodiment refers to Figures 4-7 At the two ends of the back side of the second clamping area 53231, a connecting rod 53232 is arranged. The control cord includes a first cord 53221 and a second cord 53222. For details, please refer to the right side of Figure 5 The end of the first cord 53221 is fixedly connected to the outside of the back of the force transmission member 5321. The end of the second cord 53222 is fixedly connected to the outermost clamping member 5323, and then passes through the connecting rod 53232 below the two clamping members 5323, and then reaches the seat body 531. When the first cord 53221 is pulled, the cord will retract due to the force, which will cause the force transmission member 5321 to rotate relative to the seat body 531, thereby separating from the annular surface of the steel support 2. When the second cord 53222 is pulled, the distance between the two clamping members 5323 will be tightened first, and then the second cord 53222 will be further brought to a nearly horizontal state under the action of the pulling force. Figure 7The different embodiments are shown on the clamping arms 532 on both sides for the sake of brevity. In actual implementation, both clamping arms 532 can adopt the right side mode for control, and the ends of the first cable 53221 and the second cable 53222 can be guided to the special machinery on the side of the foundation pit or controlled manually. When the adjusting part 5 needs to move horizontally, the first cable 53221 and the second cable 53222 are first pulled tight, the force transmission member 5321 and the clamping member 5323 are separated from the steel support 2, and the entire clamping arm 532 and the seat body 531 are almost in a straight line. At this time, the adjusting part 5 can smoothly move horizontally to different positions of the steel support 2. After moving to the position, the first cable 53221 and the second cable 53222 are loosened, and the force transmission member 5321 and the clamping member 5323 naturally fall under the action of gravity and are attached to the outer circular surface of the steel support 2, forming a clamping state. At this time, the execution end 521 can extend or retract to push or pull the adjusting section 22 to adjust the length and further adjust the axial force. When in the clamping state, the outside of the force transmission member 5321 is in contact with the seat body 531, and the outside of the clamping member 5323 is in contact with the force transmission member 5321. When the execution end 521 pushes or pulls the adjusting section 22, part of the force can be transmitted through the force transmission member 5321, so as to be dispersed on the clamping member 5323. In this way, the thrust of the entire execution end 521 can be distributed in an arc shape on the contact part with the adjusting section 22, so as to make the force transmission more balanced, reduce the stress concentration of the stressed part, and increase the reliability.

[0061] Further, refer to Figure 8 The clamping seat 53 further comprises two cable adjusting mechanisms 533 arranged on the seat body 531. The cable adjusting mechanism 533 comprises a power source 5331, a driving shaft 5332 and a driven shaft 5333. The driving shaft 5332 is driven to rotate by the power source 5331, and the driven shaft 5333 is in transmission with the driving shaft 5332 through a gear pair 5334 and the rotation directions of the two are opposite. The two first cables 53221 on the two clamping arms 532 are respectively connected to the driving shaft 5332 and the driven shaft 5333 of one of the cable adjusting mechanisms 533, and the two second cables 53222 are respectively connected to the driving shaft 5332 and the driven shaft 5333 of the other cable adjusting mechanism 533. In this embodiment, the rotation directions of the driving shaft 5332 and the driven shaft 5333 are reversed through the action of the gear pair 5334, and then the cables on both sides of the seat body 531 are connected, so as to realize synchronous and collaborative action by the power source 5331. The structure and control mode are simplified, and the multiple cables connected to the side of the foundation pit can be controlled by external machinery or personnel, which can simplify manual operation and the complexity of cable connection of the system, and especially can avoid the problems of sliding processing of the cable end pulling control in the sliding process of the adjusting part 5 and the mutual influence between the cables.

[0062] As an alternative to the above cable control mode, please refer toFigures 4-7 , please refer to the left side of the part in Figure 5 , the second clamping area 53231 of the clamping piece 5323 is provided with a connecting rod 53232 at both ends of the back side, the control rope includes a third rope 53223, and the inner side of the back of the force transmission piece 5321 is provided with a wire hole; the end of the third rope 53223 is connected to the outermost clamping piece 5323, is first passed below the connecting rod 53232 at both ends of the outermost clamping piece 5323, is then passed through the wire hole, is then passed below the connecting rod 53232 at both ends of the inner clamping piece 5323, and finally reaches the seat body 531. The embodiment is similar to the above-mentioned embodiment, but in the embodiment, only one pulling rope, that is, the third rope 53223, is used, and the difference is that the third rope 53223 is passed through the wire hole in the inner side of the force transmission piece 5321 in addition to being connected to the two clamping pieces 5323. When the end of the third rope 53223 is pulled, the third rope 53223 is tightened, the two clamping pieces 5323 are close to each other, and under the action of further pulling force, the state shown on the left side of Figure 7 is reached. In order to save space, different implementation manners are shown on the clamping arms 532 on both sides in the figure. In specific implementation, both of the two clamping arms 532 can be controlled in the manner shown on the left side, and the ends of the first rope 53221 and the second rope 53222 can be guided to a special machine on the foundation pit side or manually controlled. In this state, the adjusting part 5 can smoothly move transversely to different steel support 2 positions. After moving to the position, the third rope 53223 is loosened, the force transmission piece 5321 and the clamping piece 5323 naturally fall under the action of gravity and are attached to the outer circular surface of the steel support 2 to form a clamping state. At this time, the execution end 521 can be extended or retracted to push or pull the adjusting section 22 to adjust the length and further adjust the axial force. When in the clamping state, the outer side of the force transmission piece 5321 is in contact with the seat body 531, and the outer side of the clamping piece 5323 is in contact with the force transmission piece 5321. When the execution end 521 pushes or pulls the adjusting section 22, part of the acting force can be conducted through the force transmission piece 5321 and thus dispersed to the clamping piece 5323, so that the pushing force of the entire execution end 521 can be distributed in an arc shape on the contact position of the adjusting section 22, which can make the force transmission more balanced, reduce stress concentration of the stressed part, and increase reliability. Compared with the last embodiment, the structure is further simplified, the control rope only needs one, and the pulling rope adjusting mechanism 533 of the control rope also only needs one set, so that the cost is reduced and the efficiency is increased. In specific implementation, the pulling rope adjusting mechanism 533 is the same as in the above-mentioned embodiment, but only one set is needed, and the two third ropes 53223 of the two clamping arms 532 are connected to the driving shaft 5332 and the driven shaft 5333 of the pulling rope adjusting mechanism 533.

[0063] Please refer to Figures 1-3The shell end 522 of the telescopic part 52 is connected with a flexible cable 523 at one end, and the other end of the flexible cable 523 is slidingly connected to the side of the foundation pit. In this embodiment, the flexible cable 523 plays a role of safety rope, and can also balance the weight of the adjusting part 5, so that the sliding of the adjusting part 5 is smoother, and the driving force required for manually or mechanically pushing the adjusting part 5 to slide is smaller. The adjusting part body 50 can also be rotatably installed on the sliding seat 51, and when the flexible cable 523 is pulled from the side of the foundation pit, the adjusting part body 50 can be rotated from the horizontal state to the vertical state perpendicular to the horizontal plane and close to the side wall of the foundation pit. In this state, it is convenient to push the adjusting part 5 to move, and it is also convenient to maintain the cable adjusting mechanism 533 and the clamping arm 532 at the head of the adjusting part 5, avoid manual work in the support area in the middle of the foundation pit, and reduce the difficulty of work and improve the safety of work.

[0064] Please refer to Figure 9 and Figure 12 , the prestress adjusting device also includes a walking part 6, and the adjusting part 5 is at least two. The axis of the walking part 6 is perpendicular to the axis of the steel support 2, the length of the walking part 6 is greater than the distance between the adjacent two steel supports 2, the bottom of the walking part 6 is connected to the steel support 2, and the bottom of the adjusting part 5 is connected to the top of the walking part 6 through the first electromagnet 524. The walking part 6 carries the adjusting part 5 to switch positions on the plurality of steel supports 2. In this embodiment, the position of the adjusting part 5 on the steel support 2 is adjusted by the walking part 6, and the sliding cooperation of the sliding seat 51 at the end of the adjusting part 5 and the steel enclosing purlin 12 realizes the guidance, and the flexible cable 523 connected to the middle part of the adjusting part 5 realizes the gravity balance and the anti-falling. The walking part 6 can be controlled by a remote controller, and the first electromagnet 524 in the middle part of the adjusting part 5 is adsorbed on the walking part 6 and moves with the walking part 6 to realize the change of the adjusting position, which avoids the process of manually pushing the adjusting part 5 to move at the side of the foundation pit, and increases the efficiency and safety of construction.

[0065] Please refer to Figure 10 and Figure 11The walking part 6 comprises a frame body 61, a walking plate chain 62 and a switching mechanism 63. Two ends of the frame body 61 are provided with controllable adsorption mechanisms 611 which can be adsorbed to the steel support 2. When the walking part 6 is in a non-moving state, the controllable adsorption mechanisms 611 can be strongly adsorbed to the steel support 2 to keep stable, supporting the adjusting part body 50 and increasing the strength and stability thereof. The walking plate chain 62 is arranged inside the frame body 61, and the upper chain 6211 of the walking plate chain 62 is lower than the top of the frame body 61, and the lower chain 6212 of the walking plate chain 62 is higher than the bottom of the frame body 61. In the initial state, only the frame body 61 of the walking part 6 is in contact with the steel support 2 and the adjusting part body 50, and the walking plate chain 62 is not in contact with the two, and the contact surface and friction force therebetween are small. The switching mechanism 63 is arranged between the upper chain 6211 and the lower chain 6212 of the walking plate chain 62, and the switching mechanism 63 comprises a switching frame 631, a supporting wheel 632 and a lifter 633. A plurality of supporting wheels 632 are rotatably arranged on the switching frame 631, the switching frame 631 is connected to the lifter 633, and the lifter 633 can adjust the height of the switching frame 631. When the walking part needs to walk between a plurality of steel supports 2, the lifter 633 adjusts the height of the switching frame 631 to be low. At this time, the lower chain 6212 of the walking plate chain 62 moves down to be in contact with the steel support 2, and the upper chain 6211 of the walking plate chain 62 is still not in contact with the adjusting part body 50. Therefore, when the walking plate chain 62 operates, the walking part 6 will move between the plurality of steel supports 2, and the two adjusting parts 5 will remain in the original position. Because of the limiting action of the two adjusting parts 5, it can also prevent the situation that when the walking part 6 is short, if it walks to be located on only one steel support 2, one end may be lifted and unstable. When it is necessary to change the position of the adjusting part 5 on the walking part 6, the controllable adsorption mechanism 611 can be adsorbed to the steel support 2, and then the lifter 633 adjusts the height of the switching frame 631 to be high. At this time, the upper chain 6211 of the walking plate chain 62 moves up to be in contact with the adjusting part 5, and a large friction force is formed therebetween, so that the adjusting part 5 is moved by the walking plate chain 62 to change the position. At the same time, the lower chain 6212 is not in contact with the steel support 2, and the walking part 6 is stably adsorbed to the steel support 2, and the position will not be changed. In this embodiment, the body of the walking part 6 and the adjusting part 5 thereon are independently controlled by a set of plate chain systems, the position of the adjusting part 5 is adjusted, the structure is simple and light, and the vertical load of the steel support 2 is not affected. When in a non-working state, the adjusting part 5 transmits the gravity load thereof to the side wall of the foundation pit through the flexible cable 523, and the first electromagnet 524 on the two adjusting parts 5 can adsorb the walking part 6 to the adjusting part 5. The gravity load of the whole prestress adjusting device almost does not act on the steel support 2, the influence of the adjusting device on the support system is reduced, and the reliability of the support is improved.

[0066] Further, the frame body 61 and the switching frame 631 can use aluminum material. The aluminum material has good strength and small quality, and more importantly, does not affect the adsorption effect of the controllable adsorption mechanism 611 and the first electromagnet 524. The chain piece unit of the walking plate chain 62 can be a double-layer structure, the outer layer is rubber, and the inner layer is an iron sheet. The rubber layer is a contact layer, which can increase the friction, and the inner layer iron sheet can well respond to the suction force of the first electromagnet 524, and can limit the extrusion deformation of the chain piece unit, further increase the friction, so that the two can be stably connected together, whether moving with the adjusting part 5 or adsorbed to the adjusting part 5 to reduce the gravity load on the steel support 2 has good effect, which can improve the stability of the whole device and reduce the influence on the support system.

[0067] In summary, the present application effectively overcomes the problem that the existing technology requires a servo adjusting device on each steel support, which greatly increases the cost of the whole support system and makes the installation and disassembly process of the steel support complex. The present application can adjust the axial force of multiple steel supports through the same adjusting device through the universal adjusting part 5, which can effectively reduce the number of servo devices, significantly improve the cost of the whole support system, and has good economic benefits.

[0068] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the present application should be covered by the claims of the present application.

Claims

1. A prestressed stress adjusting device for a steel support for foundation pit support, comprising a first foundation pit side, a second foundation pit side, a steel purlin (12), a steel support (2) and an adjusting portion (5), wherein both ends of the steel support (2) are connected to the first foundation pit side and the second foundation pit side respectively through the steel purlin (12), and characterized in that: The steel support (2) is provided with an adjustment section (22), and the adjustment section (22) can be extended or shortened; The axis of the adjusting portion (5) is parallel to the axis of the steel support (2), and the adjusting portion (5) comprises a sliding seat (51), a telescopic member (52) and a clamping seat (53); The sliding seat (51) and the clamping seat (53) are respectively arranged at two ends of the telescopic member (52); the telescopic member (52) includes an execution end (521) and a shell end (522); the execution end (521) is connected to the clamping seat (53); the shell end (522) is connected to the sliding seat (51); and the sliding seat (51) is also slidably connected to the steel purlin (12); The clamping seat (53) includes a seat body (531) and clamping arms (532) symmetrically arranged on both sides of the seat body (531), and a first clamping area (5311) is provided at the bottom of the seat body (531); The clamping arm (532) includes a force transmission member (5321), a control rope and two clamping members (5323). The force transmission member (5321) has an inverted "U"-shaped cross-section and one end is rotatably connected to the end of the seat body (531). The two clamping members (5323) are arranged on the inner side of the force transmission member (5321) with their heads and tails facing each other. The clamping member (5323) has a double-layer structure and the middle layer area is the second clamping area (53231). One end of the control rope is connected to the clamping arm (532) and the other end passes through the seat body (531). When the control rope is in a relaxed state, the two clamping arms (532) and the seat body (531) are connected in an arc shape. When the control rope is in a tensioned state, the two clamping arms (532) are separated from the steel support (2).

2. The prestressing adjustment device for a steel support for foundation pit support according to claim 1, characterized in that: A connecting rod (53232) is provided at each end of the back side of the second clamping area (53231), and the control cable includes a first cable (53221) and a second cable (53222); The end of the first cable (53221) is connected to the outer side of the back of the force transmission member (5321); The end of the second cable (53222) is connected to the outermost clamping member (5323), passes through the bottom of the connecting rod (53232) at both ends of the two clamping members (5323), and then reaches the seat body (531).

3. A prestressing adjustment device for steel support for foundation pit support according to claim 2, characterized in that : The clamping seat (53) further comprises two cable adjustment mechanisms (533) arranged on the seat body (531), the cable adjustment mechanisms (533) comprising a power source (5331), a driving shaft (5332) and a driven shaft (5333), the driving shaft (5332) being driven to rotate by the power source (5331), the driven shaft (5333) and the driving shaft (5332) being driven by a gear pair (5334), and the two rotating in opposite directions; The two first cables (53221) are respectively connected to the driving shaft (5332) and the driven shaft (5333) of one of the cable adjustment mechanisms (533), and the two second cables (53222) are respectively connected to the driving shaft (5332) and the driven shaft (5333) of the other cable adjustment mechanism (533).

4. The prestressing adjustment device for a steel support for foundation pit support according to claim 1, characterized in that: A connecting rod (53232) is provided at each end of the back side of the second clamping area (53231) of the clamping member (5323), the control cable includes a third cable (53223), and a wire hole is provided on the inner side of the back of the force transmission member (5321); The end of the third cable (53223) is connected to the outermost clamping piece (5323), first passes under the connecting rod (53232) at both ends of the outermost clamping piece (5323), then passes through the wire hole, and then passes under the connecting rod (53232) at both ends of the inner clamping piece (5323), and finally reaches the seat body (531).

5. The prestressing adjustment device for steel support for foundation pit support according to claim 4, characterized in that: The clamping seat (53) further comprises a cable adjustment mechanism (533) provided on the seat body (531), the cable adjustment mechanism (533) comprising a power source (5331), a driving shaft (5332) and a driven shaft (5333), the driving shaft (5332) being driven to rotate by the power source (5331), the driven shaft (5333) and the driving shaft (5332) being driven by a gear pair (5334), and the two rotating in opposite directions; The two third cables (53223) are respectively connected to the driving shaft (5332) and the driven shaft (5333) of the cable adjustment mechanism (533).

6. The prestressing adjustment device for steel support for foundation pit support according to claim 1, characterized in that: A flexible cable (523) is connected to one end of the shell end (522) of the telescopic member (52) toward the clamping seat (53), and the other end of the flexible cable (523) is slidably connected to the side of the foundation pit.

7. The prestressing adjustment device for a steel support for foundation pit support according to claim 6, characterized in that: It also includes a walking part (6), and the number of the adjusting parts (5) is at least two; The axis of the walking part (6) is perpendicular to the axis of the steel support (2), the bottom of the walking part (6) is connected to the steel support (2), the bottom of the adjusting part (5) is connected to the top of the walking part (6) through a first electromagnet (524), and the walking part (6) carries the adjusting part (5) to switch positions on multiple steel supports (2).

8. The prestressing adjustment device for steel support for foundation pit support according to claim 7, characterized in that: The walking part (6) includes a frame body (61), a walking plate chain (62) and a switching mechanism (63); Controllable adsorption mechanisms (611) are provided at both ends of the frame body (61) and can be adsorbed on the steel support (2); The walking plate chain (62) is arranged inside the frame body (61), and the upper chain (6211) of the walking plate chain (62) is lower than the top of the frame body (61), and the lower chain (6212) of the walking plate chain (62) is higher than the bottom of the frame body (61); The switching mechanism (63) is arranged between the upper chain (6211) and the lower chain (6212) of the walking plate chain (62). The switching mechanism (63) includes a switching frame (631), a supporting wheel (632) and a lifter (633). A plurality of supporting wheels (632) are rotatably arranged on the switching frame (631). The switching frame (631) is connected to the lifter (633). The lifter (633) can adjust the height of the switching frame (631).

9. The prestressing adjustment device for steel support for foundation pit support according to claim 8, characterized in that: The frame body (61) and the switching frame (631) are made of aluminum.

10. The prestressing adjustment device for steel support for foundation pit support according to claim 8, characterized in that: The chain plate unit of the walking plate chain (62) is a double-layer structure, with an outer layer being rubber and an inner layer being an iron sheet.

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