An underground foundation pit supporting device for building construction

Abstract

The application relates to the technical field of foundation pit supporting devices, in particular to an underground foundation pit supporting device for building construction, which comprises two supporting plates arranged symmetrically, further comprises an inner supporting mechanism arranged between the two supporting plates, the inner supporting mechanism comprises a gear housing arranged at the middle position of the two supporting plates, two upper rotating shafts and two lower rotating shafts are rotatably connected to the upper and lower ends of the gear housing respectively, upper connecting rods are fixed to the outer sides of the two upper rotating shafts, lower connecting rods are fixed to the outer sides of the two lower rotating shafts, and one end of each of the two upper connecting rods is rotatably connected to one side of each of the two supporting plates. The inner supporting mechanism can apply horizontal thrust to the two supporting plates simultaneously, so that the two supporting plates are pressed against the surfaces of the two opposite sidewalls of the foundation pit, the two supporting plates can support the two sidewalls of the foundation pit, the installation and dismounting steps are simple, the supporting frame can be erected quickly, and the construction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support devices, and in particular to an underground foundation pit support device for building construction. Background Technology

[0002] Excavation pit support is a set of measures used to support, reinforce, and protect the sidewalls and surrounding environment of an excavation pit, ensuring the safety of underground structure construction and the surrounding environment. The main purpose of excavation pit support is to maintain the stability of buildings and the natural ground outside the pit, preventing soil instability and collapse. During excavation, different support structures and methods are used to maintain the stability of the pit walls and ensure construction safety.

[0003] Currently, there are many types of underground foundation pit support devices used in building construction. Among them, the support method using support plates in combination with supporting structures is widely used in the construction of small and medium-sized foundation pits due to its simple structure and low cost. However, the existing support devices are fixed to the support frame and piles by welding or bolts, which makes the installation and dismantling process cumbersome, requiring multiple tools and personnel to work together. The adjustment and disassembly steps are complicated, resulting in low construction efficiency and an inability to achieve rapid support and evacuation, making it difficult to meet the high-efficiency requirements of modern construction. Summary of the Invention

[0004] The purpose of this invention is to provide an underground foundation pit support device for building construction, so as to solve the problems mentioned in the background art.

[0005] The technical solution of the present invention is: an underground foundation pit support device for building construction, comprising two symmetrically arranged support plates, and an internal support mechanism disposed between the two support plates: the internal support mechanism includes a gear housing disposed in the middle of the two support plates, the upper and lower ends of the gear housing being respectively rotatably connected to two upper rotating shafts and two lower rotating shafts, upper connecting rods being fixed to the outer sides of the two upper rotating shafts, and lower connecting rods being fixed to the outer sides of the two lower rotating shafts; one end of the two upper connecting rods is rotatably connected to one side of the two support plates, and one end of the two upper connecting rods is rotatably connected to one side of the two support plates; a diagonal bracing reinforcement mechanism is provided at the upper end of one side of each of the two support plates.

[0006] Preferably, the diagonal bracing reinforcement mechanism includes a guide frame fixed to the upper end of one side of the support plate and a diagonal bracing rod rotatably connected to the upper connecting rod. A guide bar is fixed to the inner side of the guide frame, and a hollow slider is slidably connected to the inner side of the guide frame through the guide bar. The upper end of the diagonal bracing rod is rotatably connected to the outer side of the hollow slider. A locking mechanism is provided inside the hollow slider, and the locking mechanism is used to fix the hollow slider at a designated position inside the guide frame.

[0007] Preferably, the locking mechanism includes two rods that are slidably inserted through both ends of the hollow slider, a central gear that is rotatably connected to the inner side of the hollow slider at the middle position, both rods being elastically connected to both ends of the inner side of the hollow slider, and one end of each rod being fixed with a rack, both racks being meshed with the two sides of the central gear through their teeth, and also includes an unlocking drive mechanism that can be separated from and engaged with one end of the central gear.

[0008] Preferably, the unlocking drive mechanism includes a connecting shaft movably inserted into one side of the hollow slider at the position corresponding to the central gear, and a transmission housing movably disposed on the outside of the hollow slider. One end of the connecting shaft is rotatably connected to the inside of the transmission housing, and a worm gear located inside the transmission housing is fixed to the outer end of the connecting shaft. A worm gear meshing with the worm gear is rotatably connected through the inside of the transmission housing. It also includes two symmetrically arranged engagement discs, one engagement disc being fixed at one end of the central gear and the other engagement disc being fixed at the other end of the connecting shaft. Two identical fan-shaped bosses are symmetrically fixed to one end of each engagement disc.

[0009] Preferably, two spring cylinders are fixed at both ends of the inner side of the hollow slider, and a convex ring is fixed on the outer side of each of the two insert rods. The two convex rings are slidably connected to the inner side of the two spring cylinders, and one end of each convex ring is elastically connected to one end of the inner side of the two spring cylinders through insert rod springs.

[0010] Preferably, rack guide rods are slidably inserted through the interior of both racks, and both ends of the rack guide rods are fixed to the inner side of the hollow slider.

[0011] Preferably, the locking mechanism further includes two locking holes on both sides of the guide frame, which are used to fix the two plug rods to the position of the hollow slider.

[0012] Preferably, a plurality of sliding lugs are fixed to the outer side of the transmission housing, and a plurality of fixing posts are fixed to the outer side of the hollow slider. The plurality of fixing posts are slidably inserted into the interior of the plurality of sliding lugs, and a limit block is fixed to one end of each of the plurality of fixing posts. One end of each of the plurality of sliding lugs is elastically connected to the outer side of the hollow slider through a return spring.

[0013] Preferably, an upper gear is fixed to the outer side of each of the two upper rotating shafts, and the two upper gears mesh with each other; a lower gear is fixed to the outer side of each of the two lower rotating shafts, and the two lower gears mesh with each other.

[0014] Preferably, the upper and lower connecting rods connected to the same support plate are parallel to each other and of equal length.

[0015] The present invention provides an improved underground foundation pit support device for building construction, which has the following improvements and advantages compared with the prior art: Firstly, this invention uses an internal support mechanism to apply a horizontal thrust to two support plates simultaneously, causing the two support plates to press against the opposite side walls of the foundation pit. The two support plates can then support the side walls of the foundation pit. The installation and disassembly steps are simple, enabling rapid support erection and improving construction efficiency.

[0016] Secondly, the present invention uses a diagonal bracing reinforcement mechanism. When the inner bracing mechanism fully expands the two support plates, the reinforcement mechanism can fix the angle of the upper connecting rod, so that the diagonal bracing rod, support plate, and upper connecting rod in the diagonal bracing reinforcement mechanism form a stable triangular structure. This ensures that the upper and lower connecting rods always maintain a horizontal angle, thereby guaranteeing the support stability of the two support plates and improving the reliability of the support. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the first cross-sectional structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the second cross-sectional structure of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B; Figure 6 This is a cross-sectional view of the hollow slider in this invention. Figure 7 This is a schematic diagram of the upper and lower connecting rods in the horizontal state in this invention.

[0019] Figure label: 1. Support plate; 2. Gear housing; 3. Upper rotating shaft; 4. Lower rotating shaft; 5. Upper connecting rod; 6. Lower connecting rod; 7. Upper gear; 8. Lower gear; 9. Lifting ring; 101. Diagonal brace; 102. Guide frame; 103. Hollow slider; 104. Guide bar; 201. Insert rod; 202. Central gear; 203. Rack; 204. Spring cylinder; 205. Convex ring; 206. Insert rod spring; 207. Rack guide rod; 208. Locking hole; 301. Connecting shaft; 302. Engaging disc; 303. Fan-shaped boss; 304. Transmission housing; 305. Worm gear; 306. Worm; 401. Sliding lug; 402. Fixed column; 403. Return spring; 404. Limit block. Detailed Implementation

[0020] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. 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.

[0021] This invention provides an improved underground foundation pit support device for building construction. The technical solution of this invention is as follows: like Figures 1 to 7 As shown, this embodiment of the invention provides an underground foundation pit support device for building construction, including two symmetrically arranged support plates 1, and an internal support mechanism disposed between the two support plates 1. The internal support mechanism includes a gear housing 2 disposed in the middle of the two support plates 1. The upper and lower ends of the gear housing 2 are respectively rotatably connected to two upper rotating shafts 3 and two lower rotating shafts 4. Upper connecting rods 5 are fixed to the outer sides of the two upper rotating shafts 3, and lower connecting rods 6 are fixed to the outer sides of the two lower rotating shafts 4. One end of the two upper connecting rods 5 is rotatably connected to one side of the two support plates 1, and one end of the two upper connecting rods 5 is rotatably connected to one side of the two support plates 1. A diagonal bracing reinforcement mechanism is provided at the upper end of one side of each of the two support plates 1.

[0022] Furthermore, the diagonal bracing reinforcement mechanism includes a guide frame 102 fixed to the upper end of one side of the support plate 1 and a diagonal bracing rod 101 rotatably connected to the upper connecting rod 5. A guide bar 104 is fixed to the inner side of the guide frame 102, and a hollow slider 103 is slidably connected to the inner side of the guide frame 102 through the guide bar 104. The upper end of the diagonal bracing rod 101 is rotatably connected to the outer side of the hollow slider 103. A locking mechanism is provided inside the hollow slider 103. The locking mechanism is used to fix the hollow slider 103 at a designated position inside the guide frame 102. The locking mechanism includes two insert rods 20 that are slidably inserted through both ends of the hollow slider 103. 1. A central gear 202 is rotatably connected to the inner side of the hollow slider 103 at the middle position. Two insert rods 201 are elastically connected to both ends of the inner side of the hollow slider 103. One end of each insert rod 201 is fixed with a rack 203. The two racks 203 mesh with the two sides of the central gear 202 through their teeth. The mechanism also includes an unlocking drive mechanism that can be separated from and engaged with one end of the central gear 202. The locking mechanism also includes two locking holes 208 opened on both sides of the guide frame 102. The two locking holes 208 are used to fix the two insert rods 201 to the position of the hollow slider 103. With the diagonal bracing reinforcement mechanism, when the inner bracing mechanism fully expands the two support plates 1, the reinforcement mechanism can fix the angle of the upper connecting rod 5, so that the diagonal bracing rod 101, support plate 1, and upper connecting rod 5 in the diagonal bracing reinforcement mechanism form a stable triangular structure, thereby ensuring that the upper connecting rod 5 and the lower connecting rod 6 always maintain a horizontal angle, thus ensuring the support stability of the two support plates 1.

[0023] Furthermore, the unlocking drive mechanism includes a connecting shaft 301 movably inserted into one side of the hollow slider 103 at the position corresponding to the central gear 202, a transmission housing 304 movably disposed on the outside of the hollow slider 103, one end of the connecting shaft 301 being rotatably connected to the inside of the transmission housing 304, and a worm gear 305 located inside the transmission housing 304 being fixed to the outer end of the connecting shaft 301, and a worm 306 meshing with the worm gear 305 being rotatably connected through the inside of the transmission housing 304, and also includes two symmetrically arranged meshing discs 302, one meshing disc 302 being fixed at one end of the central gear 202, and the other meshing disc 302 being fixed at the other end of the connecting shaft 301, and two fan-shaped bosses 303 of the same shape being symmetrically fixed to one end of each of the two meshing discs 302; By unlocking the drive mechanism, the two plug rods 201 can be pulled out from the inside of the two locking holes 208 at the same time, thereby releasing the fixation between the hollow slider 103 and the guide frame 102.

[0024] Furthermore, two spring cylinders 204 are fixed at both ends of the inner side of the hollow slider 103, and two protruding rings 205 are fixed on the outer side of the two insert rods 201. The two protruding rings 205 are slidably connected to the inner side of the two spring cylinders 204 respectively, and one end of each of the two protruding rings 205 is elastically connected to one end of the inner side of the two spring cylinders 204 respectively through insert rod springs 206. Both insert rods 201 are provided with insert rod springs 206 on their outer sides. Both insert rod springs 206 transmit elastic force to the two insert rods 201 through the convex rings 205, so that the two insert rods 201 are respectively inserted into the two locking holes 208, thereby fixing the hollow slider 103 at the designated position inside the guide frame 102.

[0025] Furthermore, rack guide rods 207 are slidably inserted through the interior of both racks 203, and both ends of the rack guide rods 207 are fixed to the inner side of the hollow slider 103. The rack guide rod 207 enables the rack 203 to move along a straight line while preventing the rack 203 from rotating around the insert rod 201, thereby improving the stability of the rack 203's linear movement.

[0026] Furthermore, multiple sliding lugs 401 are fixed to the outer side of the transmission housing 304, and multiple fixing posts 402 are fixed to the outer side of the hollow slider 103. The multiple fixing posts 402 are slidably inserted into the interior of the multiple sliding lugs 401, and a limit block 404 is fixed to one end of each of the multiple fixing posts 402. One end of each of the multiple sliding lugs 401 is elastically connected to the outer side of the hollow slider 103 through a return spring 403. Press the transmission housing 304 of the unlocking drive mechanism toward the hollow slider 103. Through the sliding adaptation between multiple sliding lugs 401 and multiple fixed posts 402, the transmission housing 304 can move along a straight line. When the transmission housing 304 is pressed down, the multiple sliding lugs 401 compress the multiple return springs 403 respectively. When no pressure is applied to the transmission housing 304, the transmission housing 304 separates from the hollow slider 103 under the elastic force of the multiple return springs 403.

[0027] Furthermore, upper gears 7 are fixed to the outer sides of both upper shafts 3, and the two upper gears 7 mesh with each other; lower gears 8 are fixed to the outer sides of both lower shafts 4, and the two lower gears 8 mesh with each other. When the upper connecting rod 5 and the lower connecting rod 6 on one side rotate, they will drive the upper rotating shaft 3 and the lower rotating shaft 4 at the corresponding positions to rotate synchronously. The upper rotating shaft 3 and the lower rotating shaft 4 at the corresponding positions will drive the upper gear 7 and the lower gear 8 at the corresponding positions to rotate synchronously. The upper gear 7 and the lower gear 8 at the corresponding positions will drive the adjacent upper gear 7 and the lower gear 8 to rotate in opposite directions through tooth meshing. This will drive the upper connecting rod 5 and the lower connecting rod 6 on the other side to rotate at the same speed to the horizontal angle, thereby applying a horizontal thrust of equal magnitude and opposite direction to the other support plate 1.

[0028] Furthermore, the upper connecting rod 5 and the lower connecting rod 6, which are connected to the same support plate 1, are parallel to each other and have the same length; The support plate 1, upper connecting rod 5, lower connecting rod 6, and gear housing 2 can form a parallelogram linkage mechanism. When the upper connecting rod 5 and lower connecting rod 6 rotate to the horizontal angle, the support plate 1 and gear housing 2 can be kept at a vertical angle, while the support plate 1 can be provided with a horizontal thrust towards the pit wall.

[0029] Working principle: A lifting ring 9 is fixed to the upper end of the gear housing 2. During use, the lifting ring 9 is hooked by a crane, and the entire device is lowered to the bottom of the pit. When the lower ends of the two support plates 1 contact the bottom of the pit, the device stops. Then, a downward pressure is applied to the upper end of the gear housing 2 of the internal support mechanism. After receiving the downward pressure, the gear housing 2 moves downward, which in turn drives the upper ends of the two upper connecting rods 5 and the two lower connecting rods 6 to move downward. This allows the two upper connecting rods 5 and the two lower connecting rods 6 to rotate from an inclined angle to a horizontal angle. Since the upper connecting rods 5 and the lower connecting rods 6 connected to the same support plate 1 are parallel to each other and have equal lengths, the support plate 1, the upper connecting rods 5 and the lower connecting rods 6, and the gear housing 2 form a parallelogram linkage mechanism. When the upper connecting rods 5 and the lower connecting rods 6 rotate to a horizontal angle, the support plate 1 and the gear housing 2 are kept at a vertical angle, and the support plate 1 is provided with support towards the pit wall. The horizontal thrust is due to the rotation of the upper connecting rod 5 and the lower connecting rod 6 on one side, which drives the upper rotating shaft 3 and the lower rotating shaft 4 at the corresponding positions to rotate synchronously. The upper rotating shaft 3 and the lower rotating shaft 4 at the corresponding positions drive the upper gear 7 and the lower gear 8 at the corresponding positions to rotate synchronously. The upper gear 7 and the lower gear 8 at the corresponding positions drive the adjacent upper gear 7 and the lower gear 8 to rotate in opposite directions through tooth meshing. This can drive the upper connecting rod 5 and the lower connecting rod 6 on the other side to rotate at the same speed to the horizontal angle, thereby applying a horizontal thrust of equal magnitude and opposite direction to the other support plate 1. Therefore, by pressing the inner support mechanism, a horizontal thrust can be applied to the two support plates 1 at the same time, so that the two support plates 1 press against the opposite side walls of the foundation pit. The two support plates 1 can support the side walls of the foundation pit. The installation and disassembly steps are simple, which can realize rapid support erection and improve construction efficiency. To improve support stability, a diagonal bracing reinforcement mechanism is installed at the upper end of the support plate 1. When the upper connecting rod 5 and the lower connecting rod 6 rotate to a horizontal angle, the upper connecting rod 5 pulls the hollow slider 103 towards the lower end of the guide frame 102 through the diagonal bracing rod 101, causing the hollow slider 103 to slide downwards. A locking mechanism is installed on the inner side of the hollow slider 103. When the upper connecting rod 5 rotates to a horizontal angle, the two inserts 201 at both ends of the hollow slider 103 can be aligned with the two locking holes 208 on both sides of the guide frame 102. Since insert springs 206 are installed on the outer sides of the two inserts 201, the two inserts... The spring 206 transmits its elastic force to the two insert rods 201 through the convex ring 205, so that the two insert rods 201 are respectively inserted into the two locking holes 208, thereby fixing the hollow slider 103 at a designated position inside the guide frame 102. The hollow slider 103 is restricted from sliding up and down, thus restricting the up and down sliding of the upper end of the diagonal brace 101. At this time, a stable triangular structure is formed between the support plate 1, the diagonal brace 101, and the upper connecting rod 5, so that the upper connecting rod 5 and the lower connecting rod 6 can always maintain a horizontal angle, thereby ensuring the support stability of the two support plates 1 and improving the support reliability. When the device needs to be disassembled after construction, the locking of the hollow slider 103 needs to be released. This requires pulling the two insert rods 201 out from the inside of the two locking holes 208. During operation, the transmission housing 304 of the unlocking drive mechanism is pressed towards one side of the hollow slider 103. Through the sliding adaptation between multiple sliding lugs 401 and multiple fixed posts 402, the transmission housing 304 can move along a straight line. When the transmission housing 304 is pressed down, the multiple sliding lugs 401 compress the multiple return springs 403 respectively. When no pressure is applied to the transmission housing 304, the transmission housing 304 separates from the hollow slider 103 under the elastic force of multiple return springs 403. When the transmission housing 304 is pressed close to the hollow slider 103, the transmission housing 304 drives the inner connecting shaft 301 to move closer to the central gear 202. The engagement disc 302 at one end of the connecting shaft 301 moves closer to the surface of the engagement disc 302 at one end of the central gear 202 until the multiple fan-shaped protrusions 303 on the surfaces of the two engagement discs 302 engage alternately. When the connecting shaft 301 is engaged with the central gear 202, the worm 306 is rotated, which drives the worm wheel 305 to rotate. The worm wheel 305 then drives the connecting shaft 301 to rotate. The connecting shaft 301 can transmit the rotational torque to two other staggered sector-shaped bosses 303 at one end through two sector-shaped bosses 303 at one end. This rotational torque is then transmitted to the central gear 202 through another meshing disc 302, thus driving the central gear 202 to rotate. The central gear 202 drives the central gear 202 to rotate through its teeth. The two racks 203 move in opposite directions, which in turn drive the two insert rods 201 to move in opposite directions, causing the two insert rods 201 to move simultaneously toward the inside of the spring cylinder 204. This separates the two insert rods 201 from the two locking holes 208, releasing the fixation between the hollow slider 103 and the guide frame 102. At this point, the lifting ring 9 and the gear housing 2 are lifted upwards by a crane, allowing the upper connecting rod 5 and the lower connecting rod 6 at the horizontal angle to rotate back to the tilt angle, causing the two support plates 1 to merge and releasing the support for the inner wall of the pit.

[0030] The foregoing description enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A support device for underground foundation pits used in building construction, comprising two symmetrically arranged support plates (1), characterized in that, It also includes an internal support mechanism disposed between the two support plates (1): The internal support mechanism includes a gear housing (2) located in the middle of the two support plates (1). The upper and lower ends of the gear housing (2) are respectively rotatably connected to two upper rotating shafts (3) and two lower rotating shafts (4). The outer sides of the two upper rotating shafts (3) are fixed with upper connecting rods (5), and the outer sides of the two lower rotating shafts (4) are fixed with lower connecting rods (6). One end of the two upper connecting rods (5) is rotatably connected to one side of the two support plates (1), and one end of the two upper connecting rods (5) is rotatably connected to one side of the two support plates (1). Both of the support plates (1) are provided with a diagonal bracing reinforcement mechanism on one side of the upper end.

2. The underground foundation pit support device for building construction according to claim 1, characterized in that: The diagonal bracing reinforcement mechanism includes a guide frame (102) fixed to the upper end of one side of the support plate (1) and a diagonal bracing rod (101) rotatably connected to the upper connecting rod (5). A guide bar (104) is fixed on the inner side of the guide frame (102), and a hollow slider (103) is slidably connected to the inner side of the guide frame (102) through the guide bar (104). The upper end of the diagonal bracing rod (101) is rotatably connected to the outer side of the hollow slider (103). A locking mechanism is provided inside the hollow slider (103), and the locking mechanism is used to fix the hollow slider (103) at a specified position inside the guide frame (102).

3. The underground foundation pit support device for building construction according to claim 2, characterized in that: The locking mechanism includes two insert rods (201) that are slidably inserted through both ends of the hollow slider (103), and a central gear (202) that is rotatably connected to the inner side of the hollow slider (103) at the middle position. Both insert rods (201) are elastically connected to both ends of the inner side of the hollow slider (103), and one end of each insert rod (201) is fixed with a rack (203). Both racks (203) mesh with the two sides of the central gear (202) through their teeth. The mechanism also includes an unlocking drive mechanism that can be separated from and engaged with one end of the central gear (202).

4. The underground foundation pit support device for building construction according to claim 3, characterized in that: The unlocking drive mechanism includes a connecting shaft (301) movably inserted into one side of the hollow slider (103) at the position corresponding to the central gear (202), and a transmission housing (304) movably disposed on the outside of the hollow slider (103). One end of the connecting shaft (301) is rotatably connected to the inside of the transmission housing (304), and a worm gear (305) located inside the transmission housing (304) is fixed at the outer end of the connecting shaft (301). A worm (306) meshing with the worm gear (305) is rotatably connected through the inside of the transmission housing (304). It also includes two symmetrically arranged meshing discs (302), one of which is fixed at one end of the central gear (202), and the other is fixed at the other end of the connecting shaft (301). Two fan-shaped bosses (303) of the same shape are symmetrically fixed at one end of each of the two meshing discs (302).

5. The underground foundation pit support device for building construction according to claim 3, characterized in that: Two spring cylinders (204) are fixed at both ends of the inner side of the hollow slider (103), and two protruding rings (205) are fixed on the outer side of the two insert rods (201). The two protruding rings (205) are slidably connected to the inner side of the two spring cylinders (204), and one end of each of the two protruding rings (205) is elastically connected to one end of the inner side of the two spring cylinders (204) through insert rod springs (206).

6. The underground foundation pit support device for building construction according to claim 3, characterized in that: Both racks (203) have rack guide rods (207) inserted through them, and both ends of the rack guide rods (207) are fixed to the inside of the hollow slider (103).

7. The underground foundation pit support device for building construction according to claim 3, characterized in that: The locking mechanism also includes two locking holes (208) on both sides of the guide frame (102), and the two locking holes (208) are respectively used to fix the position of the two plug rods (201) to the hollow slider (103).

8. The underground foundation pit support device for building construction according to claim 4, characterized in that: Multiple sliding lugs (401) are fixed on the outside of the transmission housing (304), and multiple fixing posts (402) are fixed on the outside of the hollow slider (103). The multiple fixing posts (402) are slidably inserted into the interior of the multiple sliding lugs (401). A limit block (404) is fixed at one end of each of the multiple fixing posts (402), and one end of each of the multiple sliding lugs (401) is elastically connected to the outside of the hollow slider (103) through a return spring (403).

9. The underground foundation pit support device for building construction according to claim 1, characterized in that: Upper gears (7) are fixed to the outer sides of both upper shafts (3), and the two upper gears (7) mesh with each other. Lower gears (8) are fixed to the outer sides of both lower shafts (4), and the two lower gears (8) mesh with each other.

10. The underground foundation pit support device for building construction according to claim 1, characterized in that: The upper link (5) and lower link (6) connected to the same support plate (1) are parallel to each other and of equal length.

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