A protective device for foundation pit construction

Abstract

The present invention relates to the technical field of foundation pit support, and specifically provides a protective device for foundation pit construction, including a first support plate and a second support plate. There are two groups of support members arranged between the first support plate and the second support plate. Each support member includes two support parts. Each support part includes two support rods, a first connection seat and a second connection seat. The first connection seat and the second connection seat are respectively fixedly connected to the first support plate and the second support plate. One ends of the two support rods are fixedly connected to the first connection seat, and the other ends of the two support rods are vertically slidably connected to the second support seat, and both support rods are 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 rods can slide vertically and always be perpendicular to the support plates, avoiding the inclination of the support plates and ensuring the support effect on the foundation pit.

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 structure and technical measures taken to prevent soil collapse, groundwater infiltration 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 a plurality of support plates. The plurality of support plates are grouped in pairs. Two support plates in the same group are parallel and spaced apart. A support mechanism is arranged between the two support plates in the same group. The support mechanism includes a threaded sleeve, a pushing part and two first elastic members. Two adjusting screws are symmetrically and threadedly inserted at both ends of the threaded sleeve. The thread structures on the two adjusting screws have opposite helix directions. Two fixing seats are symmetrically and fixedly arranged on the two mutually approaching plate surfaces of the two support plates in the same group. The end of the adjusting screw away from the threaded sleeve is hinged on the fixing seat, and the hinged end of the adjusting screw is connected to the fixing seat through the first elastic member. The pushing part is used to drive the two support plates in the same group to move away from each other when the threaded sleeve gradually tilts, so as to compensate for the distance changed due to the relative height change of the two support plates in the same group.

[0004] However, in the above solution, through structures such as a threaded sleeve, an adjusting screw and a first elastic member, when the depth of the foundation pit changes, the pushing part can drive the two support plates in the same group to move away from each other, compensating for the distance changed due to the relative height change. The compensated distance is limited and cannot ensure that the support plates are completely vertical, resulting in the support plates still being skewed and affecting 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 skew 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:

[0007] A protection device for foundation pit construction, comprising:

[0008] A first support plate and a second support plate that are parallel and spaced apart from each other;

[0009] 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;

[0010] 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. Both ends of the hinged support rod are respectively hinged to the first connecting seat and the second connecting seat;

[0011] 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 distance of the vertical movement of the first support plate relative to the second support plate;

[0012] 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 gears are 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, and the two adjusting gears respectively mesh with the first adjusting rack and the second adjusting rack.

[0013] Further, the hinged support rod includes two threaded rods and an adjusting sleeve. The inside of the adjusting sleeve has two spiral grooves. 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.

[0014] 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.

[0015] 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, and the elastic member pushes against the hinge shaft.

[0016] Further, a vertical sliding groove is formed in the second connecting seat. A slider is arranged in the vertical sliding groove. One end of the support rod is fixedly connected to the slider. Two compression springs are symmetrically arranged in the vertical sliding groove. One ends of the two compression springs are respectively fixedly connected in the vertical sliding groove, and the other ends of the two compression springs are respectively connected to both ends of the slider.

[0017] 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 nails.

[0018] The beneficial effects of the present invention are as follows:

[0019] 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.

[0020] 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, which is transmitted through the adjustment gear, the first bevel gear, the second bevel gear, etc., to make the articulated support rod extend, sharing the force exerted on the support rod by the support plate, 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 movement conditions.

[0021] In the present invention, by arranging 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 force exerted on the articulated shaft by the elastic member, thereby ensuring that the articulated support rod continuously shares the force of the support rod during the process of adjusting the length. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of a protection device for foundation pit construction provided by an embodiment of the present invention;

[0023] Figure 2 It is Figure 1 a left view of a protection device for foundation pit construction provided by an embodiment in

[0024] Figure 3 It is Figure 2 a sectional view along A-A of a protection device for foundation pit construction provided by an embodiment in

[0025] Figure 4 It is Figure 3 a partial enlarged view of part X of a protection device for foundation pit construction provided by an embodiment in

[0026] Figure 5 It is Figure 1 a top view of a protection device for foundation pit construction provided by an embodiment in

[0027] Figure 6 It is Figure 5 a sectional view along B-B of a protection device for foundation pit construction provided by an embodiment in

[0028] Figure 7 For Figure 6 a partial enlarged view of part Y of the protective device for foundation pit construction provided in an embodiment;

[0029] Figure 8 For Figure 5 a cross-sectional view of the protective device for foundation pit construction provided in an embodiment along C-C;

[0030] Figure 9 For Figure 8 a partial enlarged view of part Z of the protective device for foundation pit construction provided in an embodiment;

[0031] Figure 10 a schematic structural view of the support member of the protective device for foundation pit construction provided in an embodiment of the present invention;

[0032] Figure 11 a schematic structural view of the second connecting seat of the protective device for foundation pit construction provided in an embodiment of the present invention;

[0033] Figure 12 a schematic structural view of the second connecting seat of the protective device for foundation pit construction provided in an embodiment of the present invention from another angle;

[0034] Figure 13 a schematic internal structural view of the second connecting seat of the protective device for foundation pit construction provided in an embodiment of the present invention.

[0035] Wherein:

[0036] 100, the first support plate; 110, the second support plate; 120, the first connecting seat; 130, the second connecting seat; 140, the pin; 150, the vertical sliding groove; 160, the slider;

[0037] 200, the support rod; 210, the articulated support rod; 220, the adjusting sleeve; 230, the threaded rod; 240, the limiting sleeve;

[0038] 300, the articulated shaft; 310, the first adjusting rack; 320, the second adjusting rack; 330, the adjusting gear; 340, the first bevel gear; 350, the second bevel gear; 360, the transmission shaft; 370, the support frame; 380, the space; 390, the elastic member. Specific embodiments

[0039] In order to make the purpose, 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 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.

[0040] The serial numbers assigned to components in this text, 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 relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are 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 thus should not be construed as a limitation to this invention.

[0041] In this invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean 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 may mean that the first feature is directly above or obliquely above the second feature, or simply 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 may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0042] The following refers to Figures 1-13 to describe a protective device for foundation pit construction provided by this invention.

[0043] A protective device for foundation pit construction, which is applicable to 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.

[0044] 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.

[0045] 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 end of the two support parts of each group of support members is 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 vertically slide 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, thus avoiding the inclination of the first support plate 100 and the second support plate 110 and ensuring the support effect of the first support plate 100 and the second support plate 110 on the foundation pit.

[0046] 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 vertically slide 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.

[0047] 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, connecting grooves are provided on both the first support plate 100 and the second support plate 110, and a plurality of connecting holes are provided on the first connecting seat 120 and the second connecting seat 130. Connecting holes are also provided on the side walls of the connecting grooves. When the first connecting seat 120 and the second connecting seat 130 are respectively placed in the connecting grooves and the connecting holes are aligned, then inserting a pin 140 into the connecting 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.

[0048] 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, 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.

[0049] Specifically, such as Figure 4 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 and Figure 13As shown in the figure, the adjustment component of the present invention includes a first adjustment rack 310, an adjustment gear 330, a first bevel gear 340, and a second bevel gear 350. The first adjustment rack 310 is vertically slidably disposed within the second connection base 130. The first adjustment rack 310 is fixedly connected to one end of the support rod 200 that is vertically slidably disposed within the second connection base 130. When the support rod 200 slides vertically, it can drive the first adjustment rack 310 to slide vertically synchronously. The adjustment gear 330 is disposed at the position where the articulated rod 210 is articulated with the second connection base 130. Specifically, a hinge shaft 300 is rotatably provided on the second connection base 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 connection base 130. The adjustment gear 330 is coaxially and rotatably disposed on the hinge shaft 300. The outer circumference of the adjustment gear 330 contacts the teeth of the first adjustment rack 310. The first bevel gear 340 is coaxially and fixedly disposed on the outer circumference of the adjustment gear 330. The second bevel gear 350 is rotatably disposed within the second connection base 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 perpendicularly passes through the hinge shaft 300, and the end of the transmission shaft 360 that penetrates into the articulated rod 210. The transmission shaft 360 is coaxially and fixedly connected within one end of the articulated rod 210.

[0050] 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 within the second connection base 130. The support rod 200 drives the first adjustment rack 310 to slide vertically synchronously. 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. 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.

[0051] Specifically, in this embodiment, the articulated support rod 210 includes two threaded rods 230 and an adjusting sleeve 220. The interior of the adjusting sleeve 220 has two sections of helical grooves (not shown in the figure). The helix directions of the two sections of helical grooves are opposite, and the two sections of helical 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 sections of helical grooves inside the adjusting sleeve 220. When the transmission shaft 360 drives one end of the articulated support rod 210 to rotate, that is, the transmission shaft 360 drives one of the threaded rods 230 to rotate, the helical fit between the threaded rod 230 and the helical groove causes the threaded rod 230 to extend relative to the adjusting sleeve 220, thereby increasing the length of the entire articulated support rod 210.

[0052] For the convenience of connecting the transmission shaft 360 and the articulated support rod 210, as Figure 4 shown, a radially extending first through-hole is opened at one end of the threaded rod 230, and a second through-hole is opened on the transmission shaft 360. When the transmission shaft 360 penetrates into the articulated support 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 fixedly connect the two. The transmission shaft 360 can then drive the threaded rod 230 to rotate, thereby adjusting the length of the threaded rod 230 extending out of the adjusting sleeve 220.

[0053] 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 support 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 engaged 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 setting of the two first bevel gears 340 affecting 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.

[0054] 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 near 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 overall length of the articulated rod 210 to increase.

[0055] 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.

[0056] It should be noted that, for the articulated rod 210 to be able to share the force of the support rod 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 rod 210 increases, the end of the articulated rod 210 will push the support frame 370 to move along the axial direction of the articulated rod 210, thereby squeezing the elastic member 390. The force of the elastic member 390 on the hinge shaft 300 increases, so that the articulated rod 210 can also share the force of the support rod 200 during the process of adjusting the length.

[0057] 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 rod 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 rod 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 rod 200 and the articulated rod 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 rod 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 rod 210 starts to extend again to share the force received by the support rod 200, avoiding damage to the support rod 200.

[0058] 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 end of each of the two compression springs is fixedly connected to both ends of the vertical sliding groove 150 respectively, and the other end of each of the two compression springs is fixedly connected to both ends of the slider 160 respectively. 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.

[0059] By arranging two compression springs, the slider 160 can be located at the middle position of the vertical sliding groove 150, and further the support rod 200 can be located at the middle position of the second connecting seat 130.

[0060] 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.

[0061] 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:

[0062] Adjust the distance between the first support plate 100 and the second support plate 110:

[0063] 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.

[0064] The operator operates other equipment to press down the first support plate 100 and the second support plate 110 in sequence. When the first support plate 100 is pressed down, 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 adjusting rack 310 and the second adjusting rack 320 to move downward synchronously. Since the upper half of the first adjusting rack 310 has teeth, while the upper half of the second adjusting rack 320 has no teeth, the teeth on the upper half of the first adjusting rack 310 are engaged with the adjusting gear 330, and the other adjusting gear 330 has no teeth engaged with it. Therefore, 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, and the transmission shaft 360 drives the threaded rod 230 of the articulated rod 210 to rotate, so that the threaded rod 230 rotates relative to the adjusting sleeve 220, and further makes the length of the overall articulated 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.

[0065] 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 described in this specification.

[0066] The above-described embodiments only represent several implementation manners of the present invention. 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 Comprising: A first support plate and a second support plate that are parallel to each other and arranged at intervals; Two groups of support members, each group of support members having two support portions, the lengths of the two support portions being capable of being adjusted synchronously, and the two support portions of each group being perpendicular to the first support plate and the second support plate; The support portion includes two 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 faces of the first support plate and the second support plate that are 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 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 distance that the first support plate moves vertically relative to the second support plate; The adjustment assembly includes a first adjustment rack, a second adjustment rack, an adjustment gear, a first bevel gear and a second bevel gear. The second bevel gear is rotatably arranged on the second connection seat, and the second bevel gear is coaxially and fixedly connected to one end of the hinged support rod. There are two adjustment gears and two first bevel gears, which are symmetrically arranged about the axis of the second bevel gear. The adjustment gear is rotatably arranged at the position where the hinged support rod is hinged to the second connection seat. The first bevel gear is coaxially and fixedly connected to the adjustment gear. The first bevel gear meshes with the second bevel gear. The first adjustment rack and the second adjustment rack are respectively fixedly connected to one end of the second connection seat where the two support rods are vertically slidably arranged. The two adjustment gears respectively mesh with the first adjustment rack and the second adjustment rack.

2. The protective device for foundation pit construction according to claim 1, wherein, The hinged support rod includes two threaded rods and an adjustment sleeve. The adjustment sleeve has two spiral grooves inside, the spiral directions of the two spiral grooves are opposite, the two spiral grooves are symmetric about the midpoint of the adjustment sleeve, and the two threaded rods respectively cooperate with the two spiral grooves inside the adjustment sleeve.

3. The protective device for foundation pit construction according to claim 1, characterized in that, A hinge shaft is fixedly arranged inside the second connection seat. The hinge shaft is coaxially and rotatably connected to the adjustment 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.

4. The protective device for foundation pit construction according to claim 3, characterized in that, An elastic member is arranged inside 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 against the hinge shaft.

5. The protective device for foundation pit construction according to claim 1, characterized in that, A vertical chute is formed on the second connection seat. A slider is arranged inside 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 end of each of the two compression springs is respectively fixedly connected inside the vertical chute, and the other end of each of the two compression springs is respectively connected to both ends of the slider.

6. The protective device for foundation pit construction according to claim 1, wherein The first connection seat and the second connection seat are fixedly connected to the first support plate and the second support plate by pin joints.

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