A temporary support device for underground foundation pit construction

Abstract

This invention belongs to the field of foundation pit support technology and discloses a temporary support device for underground foundation pit construction, including multiple support rings arranged equidistantly in parallel, with their central axes coinciding. Multiple sets of limiting mechanisms are equidistantly arranged around the middle circumference of adjacent support rings. By placing the uppermost support ring at the top of the foundation pit, when the first support plate is compressed by the inner wall of the foundation pit, the first and second support plates push the support ring upwards via a slide rail, a first crank, a rotating seat, and a second crank. The support ring causes a sliding sleeve fixedly connected to it to tend to move upwards along the sliding rod. However, because the bottom plane of the locking hole on the side of the sliding sleeve closest to the support ring contacts the bottom plane of the locking block, the sliding sleeve is restricted from sliding upwards along the sliding rod. This ensures that the support ring can only move downwards, not upwards, thereby achieving rapid support for the entire inner wall of the foundation pit.

Description

Technical Field

[0001] This invention belongs to the field of foundation pit support technology, specifically a temporary support device for underground foundation pit construction. Background Technology

[0002] An excavation pit is a pit dug at the foundation design location according to the base elevation and foundation plan dimensions. During construction, when the excavation pit is large or deep, the inner wall of the pit needs to be supported to ensure the safety of the underground structure construction and the surrounding environment.

[0003] The existing method of supporting foundation pits involves attaching a large amount of sheet metal to the inner wall of the pit after excavation, and then installing numerous support rods crisscrossing inside the sheet metal. Adjacent support rods are fixed with threads. This method requires the sequential installation of numerous sheet metal and support rods, resulting in slow installation speed and low efficiency, as well as slow disassembly. Furthermore, existing foundation pit excavation equipment uses an extra-long threaded drill arm to drill downwards, limiting the drilling depth and diameter due to the length and strength of the drill arm. This prevents drilling into deep and large-diameter pits. Additionally, after drilling, the drill arm must be removed from the pit before the support device can be installed, making it prone to collapse during installation, necessitating re-drilling and creating safety hazards. Summary of the Invention

[0004] The purpose of this invention is to provide a temporary support device for underground foundation pit construction to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a temporary support device for underground foundation pit construction, comprising multiple support rings, the multiple support rings being arranged equidistantly and parallelly, the central axes of the multiple support rings coinciding, and the outer surfaces of the multiple support rings being provided with sliding grooves. Multiple sets of limiting mechanisms are equidistantly arranged on the middle circumference of adjacent two support rings. Multiple rotating seats are slidably sleeved at the middle of the multiple sliding grooves, the number of rotating seats being even. A first curved rod is movably sleeved at the end of each of the multiple rotating seats away from the support ring. Adjacent first curved rods are cross-connected. A slide rail is slidably sleeved at the end of each of the adjacent first curved rods away from the support ring. A first support plate is fixedly installed at the end of each of the multiple slide rails away from the support ring. The multiple first support... Each of the support plates has a second support plate slidably sleeved in the middle. Multiple first support plates have first telescopic sleeves symmetrically fixedly installed on both sides of their bottom edge near the support ring. Multiple second support plates have second telescopic sleeves symmetrically fixedly installed on both sides of their middle edge near the support ring, which are slidably sleeved with the first support plates. A connecting rod is fixedly installed on the bottom surface of the telescopic end of the first telescopic sleeve and fixedly connected to the top surface of the telescopic end of the adjacent second telescopic sleeve. Multiple rotating seats have second curved rods movably sleeved at their bottom edges. Adjacent second curved rods are movably sleeved in a cross configuration. The bottom ends of two adjacent second curved rods are movably sleeved with the adjacent rotating seat below them. Multiple sets of guide grooves are symmetrically opened on the inner sides of the multiple support rings. A drilling mechanism is slidably installed in the middle of the two lowest sets of guide grooves.

[0006] Preferably, the limiting mechanism includes a sliding rod and a sliding sleeve. The top end of the sliding rod is fixedly installed on the lower surface of the support ring, and the bottom end of the sliding sleeve is fixedly installed on the upper surface of the support ring. The sliding rod is slidably sleeved in the middle of the sliding sleeve. Multiple mounting holes are equidistantly provided on the side of the sliding rod near the support ring. A first elastic pad is fixedly installed on the side of the mounting hole away from the support ring. A locking block is fixedly installed on the end of the first elastic pad near the support ring. A limiting rod inserted into the middle of the locking block is fixedly installed on the side of the middle of the sliding rod near the support ring. Multiple sets of locking holes that slidably engage with the locking blocks are equidistantly provided on the side of the sliding sleeve near the support ring. An inclined surface is provided on the upper part of the locking hole away from the support ring. Sliding grooves are provided on the outer surfaces of multiple support rings.

[0007] Preferably, the drilling mechanism includes multiple sets of guide rods, each set of guide rods being slidably sleeved with an adjacent guide groove. A mounting base is fixedly installed at the center of each set of guide rods. Multiple mounting grooves are equidistantly spaced on the upper circumference of the mounting base. A second elastic element is fixedly installed on the side of each mounting groove near the center of the support ring. A push block, slidably sleeved with an adjacent mounting groove, is fixedly installed at the end of the second elastic element away from the center of the support ring on the side near the limiting mechanism. A first internal toothed ring is slidably sleeved at the center of each push block. A first driving element is fixedly installed on one side of the upper surface of the mounting base. A first drive gear that meshes with a first internal gear ring is fixedly installed at the top of the output shaft of the first drive member. A pressure block that slides and engages with an adjacent mounting groove is fixedly installed on the outer side of the second elastic member away from the limiting mechanism. A second internal gear ring is slidably sleeved on the inner side of a plurality of pressure blocks. A second drive member is fixedly installed on the other side of the upper surface of the mounting base. A second drive gear that meshes with a second internal gear ring is fixedly installed at the top of the output shaft of the second drive member. A drilling machine is provided in the middle of the mounting base. A winch is provided on the upper surface of the support ring at the top. The traction steel wire of the winch is set at the top of the drilling machine.

[0008] Preferably, the support ring is an equilateral polygon, and the support ring is made of a material with high mass and high strength.

[0009] The beneficial effects of this invention are as follows:

[0010] 1. This invention involves placing the uppermost support ring of the support device at the top of the foundation pit. The support ring below the uppermost support ring moves downwards under its own weight. The downward-moving support ring, through a rotating seat, a second crank, a first crank, and a slide rail, drives the first support plate to move away from the support ring. The first support plate then drives the second support plate to move away from the support ring. The first and second support plates contact the inner wall of the foundation pit, providing support. At this point, the downward-moving support ring stops moving downwards, and the downward-moving support ring drives the sliding sleeve fixedly connected to it along the slide rail. When the first support plate moves downwards, the second support plate moves in opposite directions through the slide rail, the first crank, the swivel, and the second crank to push the support ring upwards. The support ring drives the sliding sleeve fixedly connected to it to move upwards along the slide rod. However, because the bottom plane of the card hole on the side of the sliding sleeve close to the support ring is in contact with the bottom plane of the card block, the sliding sleeve is restricted from sliding upwards along the slide rod. Thus, the support ring can only move downwards and cannot move upwards, thereby achieving rapid support for the entire inner wall of the pit.

[0011] 2. In this invention, when the position of the upper support ring is fixed, if the diameter of the inner wall of the pit below the upper support ring increases, the downward displacement of the lower support ring will increase, thereby increasing the expansion diameter of the first and second support plates. This ensures that the first and second support plates remain tightly attached to the inner wall of the pit. Conversely, if the diameter of the inner wall of the pit below the upper support ring decreases, the downward distance of the lower support ring will decrease, thereby reducing the expansion diameter of the first and second support plates. This also ensures that the first and second support plates remain tightly attached to the inner wall of the pit. This allows for automatic and rapid adjustment of the expansion diameter of the first and second support plates according to changes in the inner wall diameter of the pit, ensuring that the first and second support plates always remain in contact with the inner wall of the pit. This avoids the problem of the first and second support plates contacting the protruding parts of the inner wall of the pit or creating gaps between the first and second support plates and the concave parts of the inner wall of the pit when the pit diameter changes, which would otherwise lead to reduced support strength.

[0012] 3. This invention activates the second driving component, whose output shaft drives the second internal gear ring to rotate via the second drive gear. This causes the protruding portion on the outer side of the second internal gear ring to detach from the pressure block. The second elastic element pulls the pressure block, which is fixedly connected to it, to move closer to the support ring. The lower surface of the pressure block detaches from the upper surface of the bottom support ring. Then, the first driving component is activated, whose output shaft drives the first internal gear ring to rotate via the first drive gear. This causes the protruding portion on the outer side of the first internal gear ring to push the push block to move away from the support ring. The push block pushes the locking block into the locking hole, allowing the support ring to drive the sliding sleeve to move upward along the sliding rod. Simultaneously, the upper surface of the bottom of the push block contacts the bottom surface of the bottom support ring. Finally, the winch is activated, which drives the traction wire to retract. The traction wire drives the drilling rig to move upward, and the drilling rig drives the mounting base to move upward. The mounting base drives the bottom support ring to move upward via the push block, and the bottom support ring drives the upper support ring to move upward. This achieves the simultaneous installation of the support device and the rapid folding of the support device while digging the pit. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall appearance of the structure of the present invention;

[0014] Figure 2 This is a schematic diagram of the support ring structure of the present invention;

[0015] Figure 3 This is a schematic diagram of the rotating base of the present invention;

[0016] Figure 4 This is a schematic diagram of the second curved rod of the present invention;

[0017] Figure 5 This is a schematic diagram of the winch structure of the present invention;

[0018] Figure 6 This is a schematic diagram of the drilling rig structure of the present invention;

[0019] Figure 7 This is a schematic diagram of the first driving component of the present invention;

[0020] Figure 8 This is a schematic diagram of the first internal toothed ring of the present invention;

[0021] Figure 9 This is a schematic diagram of the limiting rod structure of the present invention;

[0022] Figure 10 This is a schematic diagram of the sliding rod structure of the present invention;

[0023] Figure 11 This is a schematic diagram of the sliding sleeve structure of the present invention;

[0024] Figure 12 This is a schematic diagram of the structural card block of the present invention.

[0025] In the diagram: 1. Support ring; 101. Slide groove; 102. Guide groove; 2. Limiting mechanism; 201. Slide rod; 202. Slide sleeve; 203. First elastic pad; 204. Locking block; 205. Limiting rod; 3. Rotary seat; 4. First crank rod; 5. Slide rail; 6. First support plate; 7. Second support plate; 8. First telescopic sleeve; 9. Second telescopic sleeve; 10. Connecting rod; 11. Second crank rod; 12. Drilling mechanism; 1201, Guide rod; 1202, Mounting base; 1203, Mounting groove; 1204, Second elastic element; 1205, Push block; 1206, First internal gear ring; 1207, First drive gear; 1208, First driving element; 1209, Pressure block; 1210, Second internal gear ring; 1211, Second drive gear; 1212, Second driving element; 1213, Drilling rig; 1214, Winch. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figures 1 to 12As shown, this embodiment of the invention provides a temporary support device for underground foundation pit construction, including multiple support rings 1, which are arranged parallel to each other at equal intervals. Each support ring 1 has a sliding groove 101 on its outer surface. The central axes of the multiple support rings 1 coincide. Multiple sets of limiting mechanisms 2 are equidistantly arranged around the middle circumference of adjacent support rings 1. Each limiting mechanism 2 includes a sliding rod 201 and a sliding sleeve 202. The top end of the sliding rod 201 is fixedly installed on the lower surface of the support ring 1, and the bottom end of the sliding sleeve 202 is fixedly installed on the upper surface of the support ring 1. The sliding rod 201 is slidably sleeved in the middle of the sliding sleeve 202. Multiple mounting holes are equidistantly arranged on the side of the sliding rod 201 near the support ring 1. A first elastic pad 203 is fixedly installed on the side of the mounting hole away from the support ring 1. The first elastic pad 203 is close to the support ring 1. One end of the slide is fixedly installed with a locking block 204. A limiting rod 205 inserted into the middle of the locking block 204 is fixedly installed on the side of the slide rod 201 near the support ring 1. The slide sleeve 202 is provided with multiple sets of locking holes equidistantly connected to the locking block 204 on the side near the support ring 1. The upper part of the locking hole away from the support ring 1 is provided with an inclined surface. The outer surfaces of multiple support rings 1 are provided with sliding grooves 101. Multiple rotating seats 3 are slidably connected to the middle of multiple sliding grooves 101. The number of rotating seats 3 is even. The ends of multiple rotating seats 3 away from the support ring 1 are movably connected with first curved rods 4. Two adjacent first curved rods 4 are cross-movably connected. The ends of two adjacent first curved rods 4 away from the support ring 1 are slidably connected with slide rails 5. The ends of multiple slide rails 5 away from the support ring 1 are fixedly installed with first support plates 6. Multiple first support plates 6 are slidably fitted with second support plates 7 at their middle sections. Multiple first support plates 6 have first telescopic sleeves 8 symmetrically fixedly installed on both sides of their bottom edge near the support ring 1. Multiple second support plates 7 have second telescopic sleeves 9 symmetrically fixedly installed on both sides of their middle edge near the support ring 1, which are slidably fitted with the first support plates 6. A connecting rod 10 is fixedly installed on the bottom surface of the telescopic end of the first telescopic sleeve 8 and fixedly connected to the top surface of the telescopic end of the adjacent second telescopic sleeve 9. Multiple rotating seats 3 have second curved rods 11 movably fitted at their bottom edges. Adjacent second curved rods 11 are cross-movably fitted. The bottom ends of multiple second curved rods 11 are movably fitted with adjacent lower rotating seats 3. Multiple sets of guide grooves 102 are symmetrically opened on the inner surfaces of multiple support rings 1. The middle of the two lowest sets of guide grooves 102 slides... A drilling mechanism 12 is provided. Since the support ring 1 is the stress center of the entire support device, it is constructed using an equilateral polygonal structure and a high-strength, high-mass material to improve its overall strength and prevent breakage. Furthermore, during actual construction, an appropriate number of support rings 1 should be selected based on the depth of the pit to support the entire inner wall of the pit. A second support plate 7 is slidably fitted onto the middle of the first support plate 6, increasing the contact area between the support device and the inner wall of the pit, improving the support effect, preventing collapse, and also preventing the top of the lower first support plate 6 from colliding with the bottom of the upper first support plate 6 when the lower first support plate 6 moves towards the support ring 1, thus avoiding obstruction of the expansion or contraction of the first support plate 6.This results in the support device being unable to effectively support and recover the inner wall of the foundation pit;

[0028] In use, the uppermost support ring 1 of the support device is placed at the top of the pit. The support ring 1 below the uppermost support ring 1 moves downward under its own weight. The downward movement of the support ring 1 causes the rotating seat 3, which is slidably sleeved with it, to move downward. When the two rotating seats 3 on each side of the downward-moving support ring 1 move downward, they pull the two second curved rods 11, which are movably sleeved with it, to rotate inward along their own central axis and move closer together. The two adjacent second curved rods 11 that move inward move closer together cause the rotating seats 3, which are movably sleeved with it, to move closer together along the middle of the slide groove 101. The two adjacent rotating seats 3 that move closer together move closer together cause the two first curved rods 4, which are movably sleeved with it, to rotate towards the middle along their own central axis. The two first curved rods 4 that rotate inward push the sliding sleeves 101 to move closer together. The slide rail 5 moves away from the support ring 1, and the slide rail 5 drives the first support plate 6 to move away from the support ring 1. The first support plate 6 drives the second support plate 7 to move away from the support ring 1. When the first support plate 6 and the second support plate 7 come into contact with the inner wall of the pit, they support the pit. At this time, the downward-moving support ring 1 stops moving downward. In addition, the downward-moving support ring 1 drives the first support plate to move downward through the rotating seat, the second crank, the first crank and the slide rail. The upper second support plate 7 causes the lower first support plate 6 to move downward along the side of the second support plate 7 that is slidably sleeved with it through the first telescopic sleeve 8, the connecting rod 10 and the second telescopic sleeve 9, thereby realizing the rapid support of the entire inner wall of the pit.

[0029] Furthermore, when the support ring 1 moves downward, the downward-moving support ring 1 drives the sliding sleeve 202 fixedly connected to it to move downward. The inclined surface at the top of the locking hole pushes the locking block 204, which is slidably connected to it, to move to the inside of the locking hole away from the support ring 1. The locking block 204 compresses the first elastic pad 203 to contract, thereby allowing the support ring 1 to drive the sliding sleeve 202 fixedly connected to it to move downward along the inner cavity of the slide rod 201. Conversely, when the first support plate 6 is squeezed by the inner wall of the pit, the first support plate 6, through the slide rail 5, the first crank 4, the rotating seat 3 and the second crank 11, reverses the pressure on the support ring 1 to generate an upward force. The support ring 1 drives the sliding sleeve 202 fixedly connected to it to move upward along the side of the slide rod 201. However, since the bottom plane of the locking hole on the side of the sliding sleeve 202 near the support ring 1 is in contact with the bottom plane of the locking block 204, the sliding sleeve 202 is restricted from sliding upward along the slide rod 201. Thus, the support ring 1 can only move downward and cannot move upward, thereby achieving rapid support for the entire inner wall of the pit.

[0030] Furthermore, when the position of the upper support ring 1 is fixed, if the diameter of the pit inner wall below the upper support ring 1 increases, the downward movement distance of the lower support ring 1 will increase, thereby increasing the expansion diameter of the first support plate 6 and the second support plate 7. This ensures that the first support plate 6 and the second support plate 7 remain tightly attached to the pit inner wall. Conversely, if the diameter of the pit inner wall below the upper support ring 1 decreases, the downward movement distance of the lower support ring 1 will decrease, thereby reducing the expansion diameter of the first support plate 6 and the second support plate 7. This also ensures that the first support plate 6 and the second support plate 7 remain tightly attached to the pit inner wall. Thus, the expansion diameter of the first support plate 6 and the second support plate 7 can be automatically adjusted according to the change in the pit inner wall diameter. This prevents gaps from forming between the first support plate 6 and the second support plate 7 and the recessed parts of the pit inner wall when the pit diameter changes, thus avoiding the problem of reduced support strength.

[0031] like Figures 6 to 8 As shown, the drilling mechanism 12 includes multiple sets of guide rods 1201, which are slidably connected to adjacent guide grooves 102. A mounting base 1202 is fixedly installed in the middle of each set of guide rods 1201. Multiple mounting grooves 1203 are equidistantly formed on the upper circumference of the mounting base 1202. A second elastic element 1204 is fixedly installed on the side of the inner cavity of each mounting groove 1203 near the middle of the mounting base 1202. A push block 1205, slidably connected to an adjacent mounting groove 1203, is fixedly installed at the end of the second elastic element 1204 near the limiting mechanism 2, away from the middle of the mounting base 1202. A first internal toothed ring 1206 is slidably connected to the upper part of the inner side of each push block 1205. A first driving element 1208 is fixedly installed on one side of the upper surface of the mounting base 1202. The top end of the output shaft of the drive component 1208 is fixedly mounted with a first drive gear 1207 that meshes with the first internal gear ring 1206. The outer side of the second elastic component 1204 away from the limiting mechanism 2 is fixedly mounted with a pressure block 1209 that slides and engages with the adjacent mounting groove 1203. The upper part of the inner side of the multiple pressure blocks 1209 is slidably sleeved with a second internal gear ring 1210. The other side of the upper surface of the mounting base 1202 is fixedly mounted with a second drive component 1212. The top end of the output shaft of the second drive component 1212 is fixedly mounted with a second drive gear 1211 that meshes with the second internal gear ring 1210. The middle part of the mounting base 1202 is provided with a drill rig 1213. The upper surface of the topmost support ring 1 is provided with a winch 1214. The traction steel wire of the winch 1214 is set at the top of the drill rig 1213.

[0032] In use, the mounting base 1202 drives the guide rod 1201 to slide down along the guide groove 102 to the bottom of the support device. The second drive member 1212 is activated, and the output shaft of the second drive member 1212 drives the second drive gear 1211 to rotate. The second drive gear 1211 drives the second internal gear ring 1210 to rotate. The protruding part on the outer side of the second internal gear ring 1210 pushes the pressure block 1209 to move away from the middle of the mounting base 1202. The pressure block 1209 pulls the second elastic member 1204, which is fixedly connected to it, to extend. The bottom surface of the pressure block 1209 contacts the upper surface of the bottom support ring 1. Under its own weight, the mounting base 1202 pushes the bottom support ring 1 to move downward through the pressure block 1209. In addition, the drilling rig 1213 is activated, and the drilling rig 1213 rotates to dig a hole downward, thus realizing the installation of the support device while digging the pit.

[0033] After the drilling is completed, the second drive unit 1212 is activated again. The output shaft of the second drive unit 1212 drives the second internal gear ring 1210 to rotate via the second drive gear 1211. The protruding part on the outer side of the second internal gear ring 1210 disengages from the pressure block 1209. The second elastic element 1204 pulls the pressure block 1209, which is fixedly connected to it, to move closer to the support ring 1. The lower surface of the pressure block 1209 disengages from the upper surface of the bottom support ring 1. Then, the first drive unit 1208 is activated. The output shaft of the first drive unit 1208 drives the first drive gear 1207 to rotate. The first drive gear 1207 drives the first internal gear ring 1206 to rotate. The protruding part on the outer side of the first internal gear ring 1206 pushes the push block 1205 away from the center of the mounting base 1202. As the pusher moves to one side, the pusher block 1205 pushes the locking block 204 into the locking hole, thereby enabling the support ring 1 to drive the sliding sleeve 202 to move upward along the sliding rod 201. In addition, the upper surface of the bottom of the pusher block 1205 contacts the bottom surface of the lowest support ring 1, and finally the winch 1214 is started. The winch 1214 drives the traction wire to retract, and the traction wire drives the drilling rig 1213 to move upward. The drilling rig 1213 drives the mounting base 1202 to move upward. The mounting base 1202 drives the lowest support ring 1 to move upward through the pusher block 1205. The lowest support ring 1 moves upward by pushing the upper support ring 1, thereby realizing the installation of the support device while digging the pit, supporting the inner wall of the pit. In addition, the support device can also be quickly disassembled and folded.

[0034] Working principle and usage process:

[0035] This invention involves placing the uppermost support ring 1 at the top of the foundation pit. The support ring 1 below the uppermost support ring 1 moves downwards under its own weight. This downward-moving support ring 1, via the rotating seat 3, the second crank 11, the first crank 4, and the slide rail 5, drives the first support plate 6 to move away from the support ring 1. The first support plate 6 then drives the second support plate 7 to move away from the support ring 1. When the first support plate 6 and the second support plate 7 contact the inner wall of the foundation pit, they provide support. At this point, the downward-moving support ring 1 stops moving downwards. The sliding sleeve 202, which is fixedly connected to it, moves downward along the side of the sliding rod 201. Conversely, when the first support plate 6 is squeezed by the inner wall of the pit, the first support plate 6 and the second support plate 7 push the support ring 1 upward through the slide rail 5, the first crank 4, the rotary seat 3, and the second crank 11. The support ring 1 causes the sliding sleeve 202, which is fixedly connected to it, to tend to move upward along the sliding rod 201. However, because the bottom plane of the locking hole on the side of the sliding sleeve 202 near the support ring 1 is in contact with the bottom plane of the locking block 204, the sliding sleeve 202 is restricted from moving upward along the sliding rod. 201 slides upwards, thus ensuring that support ring 1 can only move downwards and not upwards, thereby quickly supporting the entire inner wall of the pit. Furthermore, when the position of the upper support ring 1 is fixed, if the diameter of the pit inner wall below the upper support ring 1 increases, the downward displacement of the lower support ring 1 will increase, thereby increasing the expansion diameter of the first support plate 6 and the second support plate 7, ensuring that the first support plate 6 and the second support plate 7 remain tightly attached to the pit inner wall. Conversely, if the diameter of the pit inner wall below the upper support ring 1 decreases, the downward displacement of the lower support ring 1 will increase. The distance between them will decrease, thus reducing the expansion diameter of the first support plate 6 and the second support plate 7. The first support plate 6 and the second support plate 7 will be in close contact with the inner wall of the pit, thereby enabling automatic and rapid adjustment of the expansion diameter of the first support plate 6 and the second support plate 7 according to the change in the diameter of the inner wall of the pit. This ensures that the first support plate 6 and the second support plate 7 are always in close contact with the inner wall of the pit, avoiding the problem of the first support plate 6 and the second support plate 7 contacting the protruding part of the inner wall of the pit and creating gaps with the concave part of the inner wall of the pit when the diameter of the pit changes, which would lead to a decrease in support strength.

[0036] Furthermore, by activating the second drive member 1212, the output shaft of the second drive member 1212 drives the second internal gear ring 1210 to rotate via the second drive gear 1211, causing the protruding portion on the outer side of the second internal gear ring 1210 to disengage from the pressure block 1209. The second elastic member 1204 pulls the pressure block 1209, which is fixedly connected to it, to move closer to the support ring 1. The lower surface of the pressure block 1209 disengages from the upper surface of the bottom support ring 1. Then, the first drive member 1208 is activated, and the output shaft of the first drive member 1208 drives the first internal gear ring 1206 to rotate via the first drive gear 1207, causing the protruding portion on the outer side of the first internal gear ring 1206 to push the push block 1205 to move away from the support ring 1. When the pusher 1205 moves the locking block 204 into the locking hole, the support ring 1 can drive the sliding sleeve 202 to move upward along the sliding rod 201. In addition, the upper surface of the bottom of the pusher 1205 contacts the bottom surface of the lowest support ring 1. Finally, the winch 1214 is started. The winch 1214 drives the traction steel wire to retract, and the traction steel wire drives the mounting base 1202 to move upward. The mounting base 1202 drives the lowest support ring 1 to move upward through the pusher 1205. The lowest support ring 1 drives the upper support ring 1 to move upward through the limiting mechanism 2. This realizes the installation of the support device while digging the pit, supporting the inner wall of the pit. In addition, the support device can be quickly disassembled and folded.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A temporary support device for underground foundation pit construction, comprising multiple support rings (1), characterized in that: Multiple support rings (1) are arranged parallel at equal intervals, and the central axes of the multiple support rings (1) coincide. Each of the multiple support rings (1) has a sliding groove (101) on its outer surface. Multiple sets of limiting mechanisms (2) are equidistantly arranged around the middle circumference of adjacent two support rings (1). Multiple rotating seats (3) are slidably sleeved in the middle of each of the multiple sliding grooves (101). The number of rotating seats (3) is even. A first crank rod (4) is movably sleeved at the end of each of the multiple rotating seats (3) away from the support ring (1). Adjacent first crank rods (4) are movably connected in a cross configuration. A slide rail (5) is slidably sleeved at the end of each of the adjacent first crank rods (4) away from the support ring (1). A first support plate (6) is fixedly installed on the side of each of the multiple slide rails (5) away from the support ring (1). A second support plate (7) is slidably sleeved in the middle of each of the multiple first support plates (6). A first telescopic sleeve (8) is symmetrically fixedly installed on both sides of the bottom of a support plate (6) near the side of the support ring (1). A second telescopic sleeve (9) that slides and fits into the first support plate (6) is symmetrically fixedly installed on both sides of the middle of a plurality of second support plates (7) near the side of the support ring (1). A connecting rod (10) that is fixedly connected to the top surface of the telescopic end of the first telescopic sleeve (8) is fixedly installed on the bottom surface of the telescopic end of the adjacent second telescopic sleeve (9). A second crank (11) is movably fitted at the bottom of a plurality of rotating seats (3). Adjacent second cranks (11) are cross-movably fitted. The bottom ends of two adjacent second cranks (11) are movably fitted with adjacent lower rotating seats (3). A plurality of guide grooves (102) are symmetrically opened on the inner side of a plurality of support rings (1). A drilling mechanism (12) is slidably provided in the middle of the two lowest sets of guide grooves (102). The limiting mechanism (2) includes a slide rod (201) and a sliding sleeve (202). The top end of the slide rod (201) is fixedly installed on the lower surface of the support ring (1), and the bottom end of the sliding sleeve (202) is fixedly installed on the upper surface of the support ring (1). The slide rod (201) is slidably sleeved on the middle part of the sliding sleeve (202). Multiple mounting holes are equidistantly provided on the side of the slide rod (201) near the support ring (1). A first elastic pad (203) is fixedly installed on the side of the mounting hole away from the support ring (1). A locking block (20) is fixedly installed on the end of the first elastic pad (203) near the support ring (1). 4) A limiting rod (205) is fixedly installed in the middle of the sliding rod (201) near the support ring (1) and inserted into the middle of the locking block (204). The sliding sleeve (202) is provided with multiple sets of locking holes that slide and engage with the locking block (204) at equal intervals on the side near the support ring (1). The upper part of the locking hole away from the support ring (1) is provided with an inclined surface. The outer surfaces of multiple support rings (1) are provided with sliding grooves (101). The bottom plane of the locking hole on the side of the sliding sleeve (202) near the support ring (1) contacts the bottom plane of the locking block (204), restricting the sliding sleeve (202) from sliding upward along the sliding rod (201).

2. The temporary support device for underground foundation pit construction according to claim 1, characterized in that: The drilling mechanism (12) includes multiple sets of guide rods (1201), which are slidably connected to adjacent guide grooves (102). A mounting base (1202) is fixedly installed in the middle of each set of guide rods (1201). Multiple mounting grooves (1203) are equidistantly spaced on the upper circumference of the mounting base (1202). A second elastic element (1204) is fixedly installed on the side of the inner cavity of each mounting groove (1203) near the middle of the mounting base (1202). A push block (1205) is fixedly installed at the end of the second elastic element (1204) near the limiting mechanism (2) away from the middle of the mounting base (1202), and is slidably connected to the adjacent mounting groove (1203). A first internal toothed ring (1206) is slidably connected to the upper part of the inner side of each push block (1205). A first driving element (1208) is fixedly installed on one side of the upper surface of the mounting base (1202). The top of the output shaft of the drive member (1208) is fixedly installed with a first drive gear (1207) that meshes with the first internal gear ring (1206). On the side away from the limiting mechanism (2), the outer side of the second elastic member (1204) is fixedly installed with a pressure block (1209) that slides and engages with the adjacent mounting groove (1203). The upper part of the inner side of the multiple pressure blocks (1209) is slidably fitted with a second internal gear ring (1210). The other side of the upper surface of the mounting base (1202) is fixedly installed with a second drive member (1212). The top of the output shaft of the second drive member (1212) is fixedly installed with a second drive gear (1211) that meshes with the second internal gear ring (1210). The middle part of the mounting base (1202) is provided with a drill (1213). The upper surface of the support ring (1) at the topmost end is provided with a winch (1214). The traction wire of the winch (1214) is set at the top of the drill (1213).

3. The temporary support device for underground foundation pit construction according to claim 1, characterized in that: The support ring (1) is an equilateral polygon and is made of a material with high mass and high strength.

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