Protective device for foundation pit construction

Abstract

The invention relates to the technical field of foundation pit supporting, in particular to a protective device for foundation pit construction, which comprises a first supporting plate and a second supporting plate, two groups of supporting pieces are arranged between the first supporting plate and the second supporting plate, each supporting piece comprises two supporting parts, and each supporting part comprises two supporting rods, a first connecting seat and a second connecting seat. The first connecting base and the second connecting base are fixedly connected to the first supporting plate and the second supporting plate respectively, one ends of the two supporting rods are fixedly connected to the first connecting base, the other ends of the two supporting rods are vertically connected to the second supporting base in a sliding mode, and the two supporting rods are both perpendicular to the first supporting plate and the second supporting plate. When the relative height of the first supporting plate and the second supporting plate changes, the supporting rods can vertically slide and are perpendicular to the supporting plates all the time, the supporting plates are prevented from inclining, and the supporting effect on a foundation pit is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support, and particularly to a protection device for foundation pit construction. Background Art

[0002] Foundation pit support refers to the support structures and technical measures taken to prevent soil collapse, groundwater seepage and protect surrounding buildings when deep foundation pits (such as subways, underground garages, underground pipe galleries, etc.) need to be excavated during urban construction or other engineering construction.

[0003] For example, Chinese Patent CN119373122A discloses a civil construction support device. The solution includes multiple support plates. The multiple support plates are grouped in pairs. Two support plates in the same group are parallel and spaced apart. A support mechanism is arranged between two support plates in the same group. The support mechanism includes a threaded sleeve, a pushing part and two first elastic members. Two distance-adjusting screws are symmetrically and threadedly inserted at both ends of the threaded sleeve. The thread structures on the two distance-adjusting screws have opposite helix directions. Two fixing seats are symmetrically and fixedly arranged on the two mutually approaching surfaces of two support plates in the same group. The end of the distance-adjusting screw away from the threaded sleeve is hinged to the fixing seat, and the hinged end of the distance-adjusting screw is connected to the fixing seat through the first elastic member. The pushing part is used to drive two support plates in the same group to move away from each other when the threaded sleeve gradually inclines, so as to compensate for the changed distance between two support plates in the same group due to the change in relative height.

[0004] However, through structures such as the threaded sleeve, the distance-adjusting screw and the first elastic member in the above solution, when the depth of the foundation pit changes, the pushing part can drive two support plates in the same group to move away from each other to compensate for the changed distance due to the change in relative height. The compensated distance is limited and cannot ensure that the support plates are completely vertical, resulting in the support plates still being deflected, which affects the support effect on the foundation pit. Summary of the Invention

[0005] Based on this, in view of the problem that the support plate is prone to deflection during the pressing process and affects the support effect, it is necessary to provide a protection device for foundation pit construction.

[0006] The above object is achieved by the following technical solutions: A protection device for foundation pit construction, comprising: A first support plate and a second support plate that are parallel and spaced apart from each other; Two groups of support members, each group of support members has two support parts, the lengths of the two support parts can be adjusted synchronously, and the two support parts in each group are perpendicular to both the first support plate and the second support plate; The support part includes two parallel support rods, a first connecting seat, a second connecting seat and a hinged support rod. The first connecting seat and the second connecting seat are respectively fixedly connected to the end faces of the first support plate and the second support plate close to each other. One end of the support rod is fixedly connected to the first connecting seat, and the other end of the support rod is vertically slidably connected to the second connecting seat. The two ends of the hinged support rod are respectively hinged to the first connecting seat and the second connecting seat; An adjusting assembly configured to increase the length of the hinged support rod when the first support plate moves vertically relative to the second support plate, and the increased length of the hinged support rod is positively correlated with the vertical movement distance of the first support plate relative to the second support plate; The adjusting assembly includes a first adjusting rack, a second adjusting rack, an adjusting gear, a first bevel gear and a second bevel gear. The second bevel gear is rotatably arranged on the second connecting seat, and the second bevel gear is coaxially and fixedly connected to one end of the hinged support rod. There are two adjusting gears and two first bevel gears, which are symmetrically arranged about the axis of the second bevel gear. The adjusting gear is rotatably arranged at the position where the hinged support rod is hinged to the second connecting seat. The first bevel gear is coaxially and fixedly connected to the adjusting gear. The first bevel gear meshes with the second bevel gear. The first adjusting rack and the second adjusting rack are respectively fixedly connected to one end of the two support rods vertically slidably arranged on the second connecting seat. The two adjusting gears respectively mesh with the first adjusting rack and the second adjusting rack.

[0007] Further, the hinged support rod includes two threaded rods and an adjusting sleeve. The adjusting sleeve has two spiral grooves inside. The spiral directions of the two spiral grooves are opposite, and the two spiral grooves are symmetric about the midpoint of the adjusting sleeve. The two threaded rods respectively cooperate with the two spiral grooves in the adjusting sleeve.

[0008] Further, a hinge shaft is fixedly arranged in the second connecting seat. The hinge shaft is coaxially and rotatably connected to the adjusting gear. A support frame is slidably connected to the hinge shaft. One end of the second bevel gear is rotatably connected to the support frame. One end of the hinged support rod is rotatably connected to the other end of the support frame. The support frame can move along the axial direction of the second bevel gear.

[0009] Further, an elastic member is arranged in the support frame. One end of the elastic member abuts against the hinge shaft. One end of the elastic member is fixedly connected to the support frame. The elastic member pushes against the hinge shaft.

[0010] Further, a vertical chute is opened on the second connecting seat. A slider is arranged in the vertical chute. One end of the support rod is fixedly connected to the slider. Two compression springs are symmetrically arranged in the vertical chute. One ends of the two compression springs are respectively fixedly connected in the vertical chute, and the other ends of the two compression springs are respectively connected to both ends of the slider.

[0011] Further, the first connecting seat and the second connecting seat are fixedly connected to the first support plate and the second support plate by pin joints.

[0012] The beneficial effects of the present invention are: In the present invention, one end of the support rod is fixed on the first support plate, and the other end is vertically slidably arranged on the second support plate, and the support rod is perpendicular to the first support plate and the second support plate. When the relative height of the first support plate and the second support plate changes, the support rod can vertically slide and always be perpendicular to the support plate, avoiding the inclination of the support plate and ensuring the support effect on the foundation pit.

[0013] In the present invention, by providing the articulated support rod and the adjustment assembly, when the first support plate and the second support plate slide vertically relative to each other, the adjustment assembly increases the length of the articulated support rod. Specifically, the sliding of the support rod drives the first adjustment rack, and through the transmission of the adjustment gear, the first bevel gear, the second bevel gear, etc., the articulated support rod is extended to share the acting force from the support plate received by the support rod, avoiding damage to the support rod due to excessive force, and setting the first adjustment rack and the second adjustment rack to ensure that when the first support plate moves upward or downward relative to the second support plate, the corresponding adjustment rack can be engaged with the adjustment gear to drive the articulated support rod to extend, ensuring that the force on the support rod can be effectively shared under different moving conditions.

[0014] In the present invention, by providing an elastic member in the support frame, as the articulated support rod extends, the end of the articulated support rod pushes the support frame to move, increasing the acting force of the elastic member on the articulated shaft, thereby ensuring that the articulated support rod continuously shares the acting force of the support rod during the process of adjusting the length. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a protection device for foundation pit construction provided by an embodiment of the present invention; Figure 2 It is Figure 1 a left view of the protection device for foundation pit construction provided by an embodiment in Figure 3 It is Figure 2 a sectional view of the protection device for foundation pit construction provided by an embodiment in along A - A; Figure 4 It is Figure 3 a partially enlarged view of part X of the protection device for foundation pit construction provided by an embodiment in ; Figure 5 It is Figure 1 a top view of the protection device for foundation pit construction provided by an embodiment in ; Figure 6 It is Figure 5 a sectional view of the protection device for foundation pit construction provided by an embodiment in along B - B; Figure 7 It is Figure 6 a partially enlarged view of part Y of the protection device for foundation pit construction provided by an embodiment in ; Figure 8 It is Figure 5Cross-sectional view of the protective device for foundation pit construction provided by an embodiment along C-C; Figure 9 For Figure 8 Partial enlarged view of part Z of the protective device for foundation pit construction provided by an embodiment; Figure 10 Schematic structural diagram of the support member of the protective device for foundation pit construction provided by an embodiment of the present invention; Figure 11 Schematic structural diagram of the second connecting seat of the protective device for foundation pit construction provided by an embodiment of the present invention; Figure 12 Schematic structural diagram of the second connecting seat of the protective device for foundation pit construction provided by an embodiment of the present invention from another angle; Figure 13 Schematic internal structure diagram of the second connecting seat of the protective device for foundation pit construction provided by an embodiment of the present invention.

[0016] Wherein: 100, first support plate; 110, second support plate; 120, first connecting seat; 130, second connecting seat; 140, pin; 150, vertical chute; 160, slider; 200, support rod; 210, articulated support rod; 220, adjusting sleeve; 230, threaded rod; 240, limiting sleeve; 300, articulated shaft; 310, first adjusting rack; 320, second adjusting rack; 330, adjusting gear; 340, first bevel gear; 350, second bevel gear; 360, transmission shaft; 370, support frame; 380, space; 390, elastic member. Detailed implementation manners

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] The serial numbers assigned to the components in this text itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The terms "connection" and "coupling" as used in this invention, unless otherwise specifically stated, both include direct and indirect connection (coupling). In the description of this invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this invention.

[0019] In this invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0020] The following refers to Figures 1-13 to describe a protective device for foundation pit construction provided by this invention.

[0021] A protective device for foundation pit construction, suitable for the support of foundation pits, includes a first support plate 100 and a second support plate 110. The first support plate 100 and the second support plate 110 are parallel to each other and arranged at intervals. There are two groups of support members arranged between the first support plate 100 and the second support plate 110. Each group of support members has two support parts. Both support parts are perpendicular to the first support plate 100 and the second support plate 110, and the lengths of the two support parts can be adjusted synchronously so as to adjust the distance between the first support plate 100 and the second support plate 110. When pressing the first support plate 100 and the second support plate 110 into the foundation pit, it is necessary to adjust the lengths of the two support parts in each group of support members in advance to ensure that the distance between the first support plate 100 and the second support plate 110 is adjusted before entering the foundation pit.

[0022] Both ends of the support part in the prior art are hinged to the first support plate 100 and the second support plate 110. When the relative height between the first support plate 100 and the second support plate 110 changes, since the support part is hinged to both the first support plate 100 and the second support plate 110, the distance between the first support plate 100 and the second support plate 110 will change, and thus it is prone to skew, affecting the support effect of the first support plate 100 and the second support plate 110 on the foundation pit.

[0023] Therefore, to solve the above problems, in the present invention, one end of the two support parts of each group of support members is fixedly connected to the end face of the first support plate 100 close to the second support plate 110, and the other ends of the two support parts of each group of support members are vertically slidably connected to the end face of the second support plate 110 close to the first support plate 100. When the relative height between the first support plate 100 and the second support plate 110 changes, one end of the two support parts of each group of support members will slide vertically relative to the second support plate 110. During the sliding process, the two support parts are always perpendicular to the first support plate 100 and the second support plate 110, so that the distance between the first support plate 100 and the second support plate 110 at both ends of the two support parts does not change, and thus the situation of tilting of the first support plate 100 and the second support plate 110 is avoided, ensuring the support effect of the first support plate 100 and the second support plate 110 on the foundation pit.

[0024] Specifically, as Figure 1 and Figure 2 shown, the support part in the embodiment of the present invention includes two parallel support rods 200, a first connection seat 120 and a second connection seat 130. The first connection seat 120 is fixedly arranged on the end face of the first support plate 100 close to the second support plate 110, and the second connection seat 130 is fixedly arranged on the end face of the second support plate 110 close to the first support plate 100. The two parallel support rods 200 are in the same horizontal plane. In this embodiment, a total of four support parts are used, and the four support parts are parallel to each other in pairs. The two parallel support rods 200 of the support part are respectively perpendicular to the first support plate 100 and the second support plate 110. One end of the two parallel support rods 200 is fixedly connected to the first connection seat 120, and the other end of the two parallel support rods 200 is vertically slidably arranged on the second connection seat 130. Therefore, when the first support plate 100 slides vertically relative to the second support plate 110, that is, when there is a height difference between the first support plate 100 and the second support plate 110, the support rod 200 will slide vertically on the second connection, and at this time the length of the support rod 200 does not change. Therefore, the distance between the first support plate 100 and the second support plate 110 does not change.

[0025] To facilitate the fixation of the first connecting seat 120 and the second connecting seat 130 on the first support plate 100 and the second support plate 110, connection grooves are provided on both the first support plate 100 and the second support plate 110, and a plurality of connection holes are provided on the first connecting seat 120 and the second connecting seat 130. Connection holes are also provided on the side walls of the connection grooves. When the first connecting seat 120 and the second connecting seat 130 are respectively placed in the connection grooves and the connection holes are aligned, then inserting a pin 140 into the connection holes can fix the first connecting seat 120 and the second connecting seat 130 on the first support plate 100 and the second support plate 110.

[0026] In a further embodiment, since the length of the support rod 200 remains unchanged when there is a height difference between the first support plate 100 and the second support plate 110, at this time, the support rod 200 will be squeezed by the first support plate 100 and the second support plate 110, and the support rod 200 is subjected to a large acting force, and the support rod 200 is easily damaged. Therefore, in order to reduce the acting force on the support rod 200, the support portion in this embodiment further includes a hinged rod 210. The two ends of the hinged rod 210 are respectively hinged to the first connecting seat 120 and the second connecting seat 130, and an adjusting assembly is provided on the second connecting seat 130. The adjusting assembly can adjust the length of the hinged rod 210. Specifically configured as when the first support plate 100 and the second support plate 110 slide relative to each other vertically, that is, when there is a height difference between the first support plate 100 and the second support plate 110, the adjusting assembly increases the length of the hinged rod 210, so that the hinged rod 210 can adapt to the height difference between the first support plate 100 and the second support plate 110, and the hinged rod 210 can share the acting force of the first support plate 100 and the second support plate 110 on the support rod 200, thereby reducing the acting force on the support rod 200 and avoiding damage to the support rod 200.

[0027] Specifically, such as Figure 4 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 and Figure 13As shown in the figure, the adjusting assembly of the present invention includes a first adjusting rack 310, an adjusting gear 330, a first bevel gear 340 and a second bevel gear 350. The first adjusting rack 310 is vertically slidably arranged in the second connecting seat 130. The first adjusting rack 310 is fixedly connected to one end of the support rod 200 that is vertically slidably arranged in the second connecting seat 130. When the support rod 200 slides vertically, it can drive the first adjusting rack 310 to slide vertically synchronously. The adjusting gear 330 is arranged at the position where the articulated rod 210 is articulated with the second connecting seat 130. Specifically, a hinge shaft 300 is rotatably arranged on the second connecting seat 130. The axis of the hinge shaft 300 is perpendicular to the axis of the articulated rod 210, and the hinge shaft 300 is fixedly connected to the articulated rod 210, so that the articulated rod 210 is articulated on the second connecting seat 130. The adjusting gear 330 is coaxially and rotatably arranged on the hinge shaft 300. The outer periphery of the adjusting gear 330 contacts the teeth of the first adjusting rack 310. The first bevel gear 340 is coaxially and fixedly arranged on the outer periphery of the adjusting gear 330. The second bevel gear 350 is rotatably arranged in the second connecting seat 130. The second bevel gear 350 is perpendicular to the axis of the articulated rod 210, and the second bevel gear 350 meshes with the first bevel gear 340. The second bevel gear 350 is coaxially and fixedly provided with a transmission shaft 360. The transmission shaft 360 vertically passes through the hinge shaft 300, and one end of the transmission shaft 360 that penetrates into the articulated rod 210. The transmission shaft 360 is coaxially and fixedly connected inside one end of the articulated rod 210.

[0028] It should be noted that when the first support plate 100 and the second support plate 110 slide vertically relative to each other, one end of the support rod 200 will slide in the second connecting seat 130. The support rod 200 drives the first adjusting rack 310 to slide vertically synchronously. The first adjusting rack 310 drives the adjusting gear 330 to rotate. The adjusting gear 330 drives the first bevel gear 340 to rotate. The first bevel gear 340 drives the second bevel gear 350 to rotate. The second bevel gear 350 drives the transmission shaft 360 to rotate. The transmission shaft 360 then drives the articulated rod 210 to rotate. When one end of the articulated rod 210 rotates, it can elongate the whole of the articulated rod 210, so that the articulated rod 210 can share the acting force received by the support rod 200.

[0029] Specifically, in this embodiment, the articulated rod 210 includes two threaded rods 230 and an adjusting sleeve 220. The interior of the adjusting sleeve 220 has two spiral grooves (not shown in the figure). The spiral directions of the two spiral grooves are opposite, and the two spiral grooves are symmetric about the midpoint position of the length of the adjusting sleeve 220. The two threaded rods 230 are respectively located in the two spiral grooves inside the adjusting sleeve 220. When the transmission shaft 360 drives one end of the articulated rod 210 to rotate, that is, the transmission shaft 360 drives one of the threaded rods 230 to rotate. The spiral fit between the threaded rod 230 and the spiral groove causes the threaded rod 230 to extend relative to the adjusting sleeve 220, thereby increasing the length of the entire articulated rod 210.

[0030] For the convenience of connecting the transmission shaft 360 and the articulated rod 210, as Figure 4 shown, a radially extending first through-hole is opened at one end of the threaded rod 230. A second through-hole is opened on the transmission shaft 360. When the transmission shaft 360 penetrates into the articulated rod 210, align the first through-hole and the second through-hole, and insert a pin into the first through-hole and the second through-hole to fix the two, and the transmission shaft 360 can drive the threaded rod 230 to rotate, thereby adjusting the length of the threaded rod 230 extending out of the adjusting sleeve 220.

[0031] It should be noted that, as Figure 9 、 Figure 12 and Figure 13 shown, the adjusting assembly of the present invention further includes a second adjusting rack 320. Since each supporting portion includes two support rods 200, there are two adjusting racks and two first bevel gears 340. At the same time, there are also two adjusting gears 330. The two first bevel gears 340 are simultaneously meshed with the second bevel gear 350. The second adjusting rack 320 is also vertically slidably disposed in the second connecting seat 130, and the second adjusting rack 320 is symmetrically disposed about the axis of the second bevel gear 350. To avoid the influence of the setting of the two first bevel gears 340 on the rotation of the second bevel gear 350, the teeth on the first adjusting rack 310 and the second adjusting rack 320 of the present invention are symmetrically disposed about the axis of the second bevel gear 350, that is, the upper half of the first adjusting rack 310 has teeth, and the lower half of the second adjusting rack 320 has teeth.

[0032] When the first support plate 100 moves downward relative to the second support plate 110, the first adjustment rack 310 and the second adjustment rack 320 move downward simultaneously. Since there are teeth on the upper half of the first adjustment rack 310 (corresponding to the upper right part of the first adjustment rack 310 in the figure) and teeth on the lower half of the second adjustment rack 320 (corresponding to the lower left part of the second adjustment rack 320 in the figure), the adjustment gear 330 only meshes with the teeth on the upper half of the first adjustment rack 310, and there are no teeth on the upper part of the second adjustment rack 320 close to the other adjustment gear 330. As a result, only one of the two first bevel gears 340 drives the second bevel gear 350 to rotate, and the other first bevel gear 340 rotates passively. When the second bevel gear 350 rotates at this time, it can increase the length of the articulated rod 210; when the first support plate 100 moves upward relative to the second support plate 110, since there are teeth on the lower half of the second adjustment rack 320 and no teeth on the lower half of the first adjustment rack 310, the adjustment rack will mesh with the teeth on the lower half of the second adjustment rack 320, thereby driving the other first bevel gear 340 among the two first bevel gears 340. The first bevel gear 340 drives the second bevel gear 350 to rotate, and the second bevel gear 350 drives the transmission shaft 360 to rotate. The rotation direction of the transmission shaft 360 does not change. The transmission shaft 360 drives one end of the articulated rod 210 to rotate, thereby causing the entire articulated rod 210 to elongate.

[0033] Specifically, as Figure 4 、 Figure 12 and Figure 13 shown, to facilitate the rotational connection of the second bevel gear 350 within the second connection seat 130, a support frame 370 is provided within the second connection seat 130. The support frame 370 has a space 380 inside. The space 380 inside the support frame 370 can accommodate the articulated shaft 300, and the support frame 370 is slidably disposed on the articulated shaft 300. The sliding direction of the support frame 370 is along the axial direction of the articulated rod 210. One end of the support frame 370 is rotatably connected to one end of the articulated rod 210, that is, one end of the support frame 370 is rotatably connected to one end of the threaded rod 230. The other end of the support frame 370 is rotatably connected to the second bevel gear 350, thereby rotatably connecting the second bevel gear 350 within the second connection seat 130.

[0034] It should be noted that, for the articulated strut 210 to be able to share the force of the support strut 200 all the time when it extends, an elastic member 390 is provided in the support frame 370. The elastic member 390 is a compression spring. One end of the elastic member 390 is fixedly connected inside the support frame 370, and the other end of the elastic member 390 abuts against the hinge shaft 300. As the length of the articulated strut 210 increases, the end of the articulated strut 210 will push the support frame 370 to move along the axial direction of the articulated strut 210, thereby squeezing the elastic member 390. The force of the elastic member 390 on the hinge shaft 300 increases, so that the articulated strut 210 can also share the force of the support strut 200 during the process of adjusting the length.

[0035] Specifically, as Figure 4 and Figure 13 shown, a limit sleeve 240 is provided in the support frame 370. The limit sleeve 240 is located inside the elastic member 390. The limit sleeve 240 is used to limit the maximum length of the extension of the articulated strut 210. One end of the limit sleeve 240 is fixedly connected inside the support frame 370, and the other end of the limit sleeve 240 is at a certain distance from the hinge shaft 300. When the other end of the limit sleeve 240 abuts against the hinge shaft 300, the extension length of the articulated strut 210 reaches the limit. At this time, the first support plate 100 and the second support plate 110 cannot continue to slide relative to each other vertically. Therefore, it is necessary to replace the pressing of the first support plate 100 or the second support plate 110. For example, originally, the first support plate 100 was pressed first, so that the first support plate 100 moved vertically downward relative to the second support plate 110. When the limit sleeve 240 in the support frame 370 abuts against the hinge shaft 300, the first support plate 100 is locked by the support strut 200 and the articulated strut 210 and cannot continue to move downward relative to the second support plate 110. Therefore, it is necessary to change the object of pressing to the second support plate 110. When the second support plate 110 is pressed, the length of the articulated strut 210 will first shorten to the initial length. At this time, there is no height difference between the second support plate 110 and the first support plate 100. Continuing to press the second support plate 110, the second support plate 110 moves vertically downward relative to the first support plate 100. At this time, the articulated strut 210 starts to extend again to share the force received by the support strut 200, avoiding damage to the support strut 200.

[0036] In a further embodiment, to ensure that the support rod 200 can be located at the middle position of the second connecting seat 130 when not subjected to the acting forces of the first support plate 100 and the second support plate 110, a vertical sliding groove 150 is formed in the second connecting seat 130. A slider 160 is arranged in the vertical sliding groove 150, and the slider 160 is fixedly connected to the support rod 200. Two compression springs are symmetrically arranged in the vertical sliding groove 150. One ends of the two compression springs are respectively fixedly connected to the two ends of the vertical sliding groove 150, and the other ends of the two compression springs are respectively fixedly connected to the two ends of the slider 160. And there are two sliders 160 in this embodiment, and the two sliders 160 are respectively fixedly connected to the first adjusting rack 310 and the second adjusting rack 320.

[0037] By arranging two compression springs, the slider 160 can be located at the middle position of the vertical sliding groove 150, so that the support rod 200 is located at the middle position of the second connecting seat 130.

[0038] It should be noted that the structure of the support rod 200 of the present invention is the same as that of the articulated support rod 210, and it also adopts the structure of the threaded rod 230 and the adjusting sleeve 220, which will not be elaborated in detail here.

[0039] Combined with the above embodiments, the specific working process of a protection device for foundation pit construction provided by the present invention is described as follows: Adjust the distance between the first support plate 100 and the second support plate 110: After the operator digs the foundation pit, measure the width of the foundation pit and adjust the lengths of the support rod 200 and the articulated support rod 210. Specifically, rotate the adjusting sleeve 220 to adjust the lengths of the support rod 200 and the articulated support rod 210 until the distance between the first support plate 100 and the second support plate 110 is close to the width of the foundation pit.

[0040] The operator operates other equipment to press down the first support plate 100 and the second support plate 110 in sequence. When pressing down the first support plate 100, the first support plate 100 moves vertically downward relative to the second support plate 110. At this time, the support rod 200 slides vertically downward in the second connecting seat 130, and the length of the support rod 200 does not change, so that the distance between the first support plate 100 and the second support plate 110 does not change, thus avoiding the inclination of the first support plate 100 and the second support plate 110. The support rod 200 drives the slider 160 to slide, and the slider 160 drives the first adjustment rack 310 and the second adjustment rack 320 to move downward synchronously. Since the upper half of the first adjustment rack 310 has teeth, while the upper half of the second adjustment rack 320 has no teeth, the teeth on the upper half of the first adjustment rack 310 mesh with the adjustment gear 330, and the other adjustment gear 330 has no teeth meshing with it. Therefore, the first adjustment rack 310 drives the adjustment gear 330 to rotate, the adjustment gear 330 drives the first bevel gear 340 to rotate, the first bevel gear 340 drives the second bevel gear 350 to rotate, the second bevel gear 350 drives the transmission shaft 360 to rotate, and the transmission shaft 360 drives the threaded rod 230 of the articulated support rod 210 to rotate, so that the threaded rod 230 rotates relative to the adjustment sleeve 220, and further makes the length of the overall articulated support rod 210 increase. At the same time, the threaded rod 230 drives the support frame 370 to compress the elastic member 390, and the other end of the elastic member 390 pushes against the articulated shaft 300 to apply a force to the second connecting seat 130, which also shares the force received by the support rod 200 and prevents the support rod 200 from being damaged.

[0041] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0042] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A protective device for foundation pit construction, characterized in that: include: A first supporting plate and a second supporting plate arranged parallel to each other and spaced apart; Two groups of support members, each group of support members has two support parts, the lengths of the two support parts can be adjusted synchronously, and the two support parts of each group are perpendicular to the first supporting plate and the second supporting plate; The support portion includes two mutually parallel support rods, a first connection seat, a second connection seat and a hinged support rod, the first connection seat and the second connection seat are respectively fixedly connected to the end surfaces of the first support plate and the second support plate close to each other, one end of the support rod is fixedly connected to the first connection seat, the other end of the support rod is vertically slidably connected to the second connection seat, and the two ends of the hinged support rod are respectively hinged to the first connection seat and the second connection seat; An adjustment assembly, the adjustment assembly being configured to increase the length of the articulated support rod when the first support plate moves vertically relative to the second support plate, the increased length of the articulated support rod being positively correlated to the distance the first support plate moves vertically relative to the second support plate; The adjusting assembly includes a first adjusting rack, a second adjusting rack, an adjusting gear, a first bevel gear and a second bevel gear. The second bevel gear is rotatably arranged on the second connecting seat. The second bevel gear is coaxial and fixedly connected to one end of the hinged support rod. There are two adjusting gears and two first bevel gears, which are symmetrically arranged about the axis of the second bevel gear. The adjusting gear is rotatably arranged at the position where the hinged support rod is hinged to the second connecting seat. The first bevel gear is coaxial and fixedly connected to the adjusting gear. The first bevel gear is meshed with the second bevel gear. The first adjusting rack and the second adjusting rack are respectively fixedly connected to one end of the second connecting seat vertically slidingly arranged on two support rods, and the two adjusting gears are respectively meshed with the first adjusting rack and the second adjusting rack.

2. The protective device for foundation pit construction according to claim 1, characterized in that: The articulated support rod includes two threaded rods and an adjusting sleeve. The adjusting sleeve has two spiral grooves inside. The two spiral grooves have opposite rotation directions and are symmetrical about the midpoint of the adjusting sleeve. The two threaded rods cooperate with the two spiral grooves in the adjusting sleeve respectively.

3. The protective device for foundation pit construction according to claim 1, characterized in that: An articulated shaft is fixedly arranged in the second connecting seat, the articulated shaft is coaxial with the adjusting gear and is rotatably connected, a support frame is slidably connected to the articulated shaft, the second bevel gear is rotatably connected to one end of the support frame, one end of the articulated support rod is rotatably connected to the other end of the support frame, and the support frame can move along the axial direction of the second bevel gear.

4. The protective device for foundation pit construction according to claim 3, characterized in that: An elastic member is arranged in the support frame, one end of the elastic member abuts against the hinge shaft, one end of the elastic member is fixedly connected to the support frame, and the elastic member pushes the hinge shaft.

5. The protective device for foundation pit construction according to claim 1, characterized in that: A vertical slide groove is provided on the second connecting seat, a slider is arranged in the vertical slide groove, one end of the support rod is fixedly connected to the slider, two compression springs are symmetrically arranged in the vertical slide groove, one end of the two compression springs are respectively fixedly connected in the vertical slide groove, and the other ends of the two compression springs are respectively connected to the two ends of the slider.

6. The protective device for foundation pit construction according to claim 1, characterized in that: The first connecting seat and the second connecting seat are fixedly connected to the first supporting plate and the second supporting plate by pins.

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