CN220704536U - Foundation pit support supporting device with safety early warning function - Google Patents

Abstract

The utility model aims to provide a foundation pit support supporting device with a safety early warning function, which comprises a vertical wall panel and a reinforced supporting component, wherein the reinforced supporting component comprises an inclined support rod in an inclined state, the whole inclined support rod is in an inclined state, the upper end of the inclined support rod is connected with the outer wall surface of the vertical wall panel in a hinged manner, and the lower end of the inclined support rod is fixedly arranged on a base of a positioning unit; the middle part installation of slant branch ejector pin is provided with and is used for detecting the deformation early warning subassembly of slant branch ejector pin bending deformation degree, and this subassembly contains the sensor module that obtains the local deflection of slant branch ejector pin, carries out the processing module of analysis to the data that acquire, for the power module of system work provides energy and outwards sends warning signal's alarm module to in time outwards send early warning signal before dangerous situation takes place, avoid the incident emergence, promote the construction safety.

Description

Foundation pit support supporting device with safety early warning function

Technical Field

The utility model relates to the field of safety protection devices in building construction sites, in particular to a foundation pit support supporting device with a safety pre-warning function.

Background

In the field of construction engineering, it is often necessary to excavate a pit formed with a downward recess at a specific location to facilitate the subsequent piling or pouring process. When the foundation pit is excavated and formed, vibration or rain wash in the construction process is extremely easy to cause collapse of the circumferential part of the foundation pit due to the large depth, so that the construction progress is delayed, and even danger and injury can be caused to constructors when serious. Therefore, various baffles or reinforced supporting devices are often installed on the circumferential inner walls of various foundation pits to avoid the occurrence of dangerous situations.

The integrated supporting system structure of the deep foundation pit pile support disclosed in the Chinese patent document with the application number of CN202022306107.2 comprises a maintenance structure enclosing purlin and an inclined supporting device connected with the enclosing purlin; the inclined supporting device comprises a front supporting inclined rod and a supporting inclined pile, wherein the front supporting inclined rod is positioned on the ground, and the supporting inclined pile is positioned underground; and a plurality of cement trays are arranged on the supporting inclined piles at intervals. By sectional grouting construction of the supporting inclined piles, cement trays are formed on the supporting inclined piles positioned under the ground. The deep foundation pit pile support integrated supporting system structure provided by the scheme simplifies the construction process, shortens the construction period, reduces the construction cost and improves the construction efficiency.

As disclosed in the chinese patent application No. CN202221410101.2, the adjustable foundation pit support device can be adjusted adaptively according to the support effect of the support in the service cycle according to practical situations, so as to effectively improve the overall safety of the construction site. The adjustable foundation pit support device comprises a vertical wall plate and a reinforced support assembly, wherein the vertical wall plate is mounted and attached to the inner wall surface of a foundation pit, the reinforced support assembly is propped against the lower concave surface of the foundation pit, the bottom surfaces of the vertical wall plate and the reinforced support assembly are inserted below the ground, and a triangular prop structure is formed among the vertical wall plate, the reinforced support assembly and the lower concave surface of the foundation pit.

Although the support roof devices applied to the foundation pit can effectively play a role in reinforcing the roof of the wall surface of the foundation pit, the applicant finds that in such a complex and changeable construction environment, the stress state of the support enclosure is often unexpectedly changed due to slotting and perforating construction performed by peripheral equipment. For example, the construction vehicle at the outer side of the foundation pit moves to run, so that an inward extrusion shrinkage effect is generated at the outer side of the foundation pit, the acting force born by the support device of the enclosure is continuously increased to cause bending deformation, and then the earth at the outer side of the foundation pit breaks through the limitation of the enclosure to collapse inwards. Particularly, when reinforcing a foundation pit with a large vertical depth, the risk of the situation is also greater.

Aiming at the problems, the utility model provides the foundation pit support supporting device capable of monitoring the deformation degree and the stress state of the foundation pit support supporting device in real time, so that early warning signals are timely and outwards sent before dangerous conditions occur, safety accidents are avoided, and construction safety is improved.

Disclosure of Invention

The foundation pit support supporting device can monitor the deformation degree and the stress state of the foundation pit support supporting device in real time, so that early warning signals can be sent out in time before dangerous conditions occur, safety accidents are avoided, and construction safety is improved.

The technical aim of the utility model is realized by the following technical scheme:

the foundation pit supporting roof supporting device with the safety early warning function comprises a vertical wall panel and a reinforced supporting component, wherein the vertical wall panel is installed and attached to the inner wall surface of a foundation pit, the reinforced supporting component is supported between the vertical wall panel and the lower concave surface of the foundation pit, the bottom surfaces of the vertical wall panel and the reinforced supporting component are inserted below the ground, a triangular supporting roof structure is formed among the vertical wall panel, the reinforced supporting component and the lower concave surface of the foundation pit, the reinforced supporting component comprises a positioning unit base which is embedded in the ground below the lower concave surface of the foundation pit in an inclined state and an inclined supporting roof rod which is connected between the vertical wall panel and the positioning unit base, the whole inclined supporting roof rod is in an inclined state, the upper end of the inclined supporting roof rod is connected with the outer wall surface of the vertical wall panel in a hinged mode, and the lower end of the inclined supporting roof rod is fixedly installed on the positioning unit base; the middle part installation of slant branch ejector pin is provided with and is used for detecting the deformation early warning subassembly of slant branch ejector pin bending deformation degree, deformation early warning subassembly include install in slant branch ejector pin middle part is used for obtaining the sensor module of the local deflection of slant branch ejector pin, be used for carrying out the processing module of analysis to the data that acquire to and be used for providing the power module of energy and be used for outwards sending alarm module of warning signal for system's work.

As the preference for the utility model, the sensor module comprises a pair of mounting parts respectively sleeved on two sides of the middle section of the inclined supporting rod, the sensor module is simultaneously connected with the mounting parts on two sides, and the sensor module, the processing module and the alarm module are mutually and electrically connected, so that the alarm is outwards warned when the inclined supporting rod is bent and deformed.

As the preference for the utility model, the vertical wall panel is provided with an adjustable socket, and the upper end part of the adjustable socket is fixedly arranged on the upper part of the outer wall surface of the vertical wall panel in a hinged manner; the anti-loosening limiting mechanism comprises a mounting part formed by outwards protruding of the middle section of the oblique supporting rod and an anti-reversing mounting part connected and mounted on the mounting part.

In a preferred aspect of the present utility model, the mounting portion has a circular ring shape, and the mounting member has a rod shape as a whole and a hook-shaped engaging portion formed at an upper portion thereof for connecting with the mounting portion.

As the preference for the utility model, the rotary telescopic adjusting mechanism comprises a block-shaped clamping part which is outwards protruded from the upper end part of the inclined supporting rod along the axial direction, a threaded adjusting hole which is arranged on the adjustable inserting seat, and a rotary adjusting piece which is arranged between the inclined supporting rod and the adjustable inserting seat; the clamping notch corresponding to the block-shaped clamping part is formed in one side, close to the inclined supporting rod, of the screwing adjusting piece, and external threads corresponding to the thread adjusting holes are formed in the outer wall of the screwing adjusting piece.

As a preferable aspect of the present utility model, a positioning hole which is recessed inward and corresponds to a lower end portion of the diagonal support rod is formed in an upper portion of the positioning unit base, and the lower end portion of the diagonal support rod is inserted into the positioning hole and is rotatable about its central axis.

Preferably, the positioning hole is filled with lubricating grease.

As the optimization of the utility model, the middle section of the inclined supporting rod is provided with a bending-resistant reinforcing rib which protrudes outwards and extends in the same direction with the inclined supporting rod.

As a preferable mode of the utility model, the whole positioning unit base is cylindrical, and the bottom end of the positioning unit base protrudes outwards to form a conical end.

As a preferable aspect of the present utility model, a plurality of fins extending in a direction parallel to an axial direction of the positioning unit base are formed around an outer peripheral surface of the positioning unit base.

In summary, the utility model can realize the following beneficial effects:

1. according to the foundation pit support supporting device with the safety warning function, the deformation warning component is arranged in the middle of the inclined supporting rod, and by means of the deformation warning component, once the inclined supporting rod is found to be in excessive bending deformation at the position of the middle section which is most concentrated in stress and most prone to deformation, warning signals can be sent outwards through corresponding modules immediately, corresponding staff can be timely prompted to carry out maintenance and overhaul treatment, and hidden danger of safety accidents is greatly reduced.

2. According to the foundation pit enclosure supporting device with the safety pre-warning function, in a longer construction period, when the supporting effect of the supporting rod piece on the vertical enclosure wall plate is loosened and weakened under the external vibration action or rain wash condition, the reinforced supporting component in the supporting rod piece can be adjusted, the supporting effect on the vertical enclosure wall plate is recovered, and the safety of a construction environment is ensured; after the preliminary prop-top installation is completed, the device has extremely strong capability of resisting collision vibration and loosening failure due to the existence of the anti-loosening limiting mechanism, so that the device is not required to be overhauled and maintained for a long time, and the labor cost and the safety risk are greatly reduced.

3. In the foundation pit support supporting device with the safety warning function, the anti-loosening limiting mechanism is connected with the mounting part formed on the periphery of the inclined supporting rod in a clamping way through the anti-reversing mounting part, so that the foundation pit support supporting device can be flexibly and conveniently detached and mounted.

4. In the foundation pit support supporting device with the safety pre-warning function, the upper end part of the inclined support rod is connected with the vertical wall panel in a hinged manner, namely, the inclination angle of the inclined support rod piece relative to the ground can be adjusted according to the difference that the bottom end of the inclined support rod is required to be installed on the ground in the actual use process, so that the application range of the supporting device provided by the scheme is wider; in addition, the hinged connection structure can ensure that the acting force transmitted from soil outside the foundation pit to the inclined supporting rod through the vertical enclosure wall plate always extends along the axial direction of the rod body, so that the phenomenon that the part, inserted into the soil, of the reinforced supporting assembly as a whole is outwards turned and tilted to lose the supporting effect due to the deflected acting force is avoided, and meanwhile, the inclined supporting rod is effectively prevented from being bent and damaged.

Drawings

FIG. 1 is a schematic diagram of the whole structure of a foundation pit enclosure supporting device with a safety pre-warning function;

FIG. 2 is a schematic diagram II of the overall structure of a foundation pit enclosure supporting device with a safety pre-warning function;

FIG. 3 is a schematic diagram of the connection and installation relationship between the deformation early warning assembly and the inclined support rod;

FIG. 4 is a schematic diagram of the connection of the components of the rotary telescopic adjustment mechanism;

FIG. 5 is a schematic cross-sectional view of the internal mating state of the rotary telescopic adjustment mechanism;

fig. 6 is a schematic view of the anti-loosening limiting mechanism in a cross-sectional view.

In the figure:

1-vertical wall panels, 1 a-adjustable sockets;

2-reinforcing the support assembly;

3, a concave surface under the foundation pit;

4-positioning unit base, 4 a-tapered end, 4 b-fin;

5-oblique supporting rod;

6-a rotary telescopic adjusting mechanism, 6 a-a block-shaped clamping part, 6 b-a thread adjusting hole, 6 c-screwing adjusting piece, 601-clamping notch, 602-external thread;

7-bending-resistant reinforcing ribs.

8-anti-loosening limiting mechanism, mounting part-8 a, anti-reversion mounting part-8 b, hook-shaped clamping part-801.

9-deformation early-warning component, 9 a-installation part.

Detailed Description

The following specific examples are intended to be illustrative of the utility model and are not intended to be limiting, as modifications of the utility model will be apparent to those skilled in the art upon reading the specification without inventive contribution thereto, and are intended to be protected by the patent law within the scope of the appended claims.

The scheme is realized by the following technical means:

examples: in the embodiment, the foundation pit support supporting device capable of monitoring the deformation degree and the stress state of the foundation pit support supporting device in real time is provided, so that early warning signals are timely and outwards sent before dangerous conditions occur, safety accidents are avoided, and construction safety is improved.

The whole structure of the supporting device is similar to a conventional foundation pit supporting mechanism, and comprises a vertical wall board 1 fixedly installed on the vertical inner wall surface of a foundation pit and a supporting rod piece which is installed between the vertical wall board 1 and the ground in a connecting way and is arranged in an inclined state. Because the connection between the vertical wall panel 1 and the foundation pit is not improved, the description is omitted, and the main needs to be noted that the vertical wall panel 1 in the scheme is placed in an upright state, one side surface of the vertical wall panel is attached to the vertical inner wall surface of the foundation pit, and the lower end part of the vertical wall panel 1 is embedded into the soil part of the foundation pit downwards.

In the technical scheme provided by the embodiment, the structures of the two end parts of the original single independent oblique supporting rod 5 are optimized and improved, so that the reinforced supporting assembly 2 is formed. Of course, a triangular supporting structure is still formed between the reinforced support assembly 2 and the vertical wall panel 1 and the concave surface 3 of the foundation pit.

The components of the reinforced support assembly 2 are first divided and comprise an inclined support bar 5 and a positioning unit base 4. An important utility model here is that the upper end of the diagonal bracing rod 5 is no longer integrally fixed to the vertical wall panel 1, but rather an integrally cylindrical adjustable socket 1a is fixedly mounted in a hinged manner, which adjustable socket 1a can be pivoted about a central axis extending in the horizontal direction over a certain angular range. A rotary telescopic adjusting mechanism 6 which can change the degree of the resisting effect of the oblique supporting rod 5 is formed between the upper end part of the oblique supporting rod 5 and the forehead adjustable inserting seat 1 a. Specifically, a square block-shaped engaging portion 6a is formed by protruding upward from the upper end portion of the oblique support rod 5, a threaded adjusting hole 6b is formed in the adjustable socket 1a from the outer end portion thereof in the axial direction, and a screwing adjusting member 6c for adjusting is further installed between the two portions. The screwing adjusting member 6c is cylindrical, an external thread 602 corresponding to the thread adjusting hole 6b is formed on the outer side of the member, and an engagement notch 601 corresponding to the block-shaped engagement portion 6a and capable of being inserted and engaged is formed on the end of the member on the side of the diagonal support rod 5, and it should be noted that the radial dimension of the thread adjusting hole 6b is larger than the radial dimension of the diagonal support rod 5 as a whole, so that a partial section of one end of the support rod can be inserted into the threaded hole and freely reciprocate. In the use process, the screwing adjusting piece 6c is rotatably installed at a position closer to the bottom section in the threaded adjusting hole 6b, and then one side of the inclined supporting rod 5 is inserted into the threaded adjusting hole 6b to enable the block-shaped clamping part 6a to be in splicing fit with the clamping notch 601. Then by rotating the oblique support rod 5 about its central axis, the screwing adjuster 6c can be pushed out and against this end of the rod.

In order to realize the real-time monitoring and detection of the state of the inclined supporting rod 5, a deformation early warning component 9 for detecting the bending deformation degree of the inclined supporting rod 5 is arranged in the middle of the inclined supporting rod 5, and the deformation early warning component 9 comprises a sensor module, a processing module, a power module and an alarm module, wherein the sensor module is arranged in the middle of the inclined supporting rod 5 and used for acquiring the local deformation amount of the inclined supporting rod 5, the processing module is used for analyzing acquired data, and the power module is used for providing energy for system operation and the alarm module is used for sending out an alarm signal. The specific sensor module comprises a pair of mounting parts 9a respectively sleeved on two sides of the middle section of the inclined supporting rod, wherein the mounting parts 9a are integrally annular, and can be fixedly mounted at local positions by being locked through a thread screwing mechanism after being sleeved on the inclined supporting rod 5. After the two mounting portions 9a are respectively locked and fixed on two sides of the middle section of the oblique supporting rod 5, the mounting portions 9a can synchronously deflect along with bending deformation of the oblique supporting rod 5 under excessive extrusion acting force in a supporting state, and the deflection is further transferred to the sensor module. The sensor module, the processing module and the alarm module are electrically connected with each other and work simultaneously under the drive of the power module. At this time, the sensor module can convert the acquired deformation of the middle section position of the inclined supporting rod 5 into a signal and send the signal to the processing module, and once the processing module detects that the value of the deformation exceeds the range of the preset value, the signal can be sent to the alarm module to start the alarm module to work. The alarm module can specifically comprise a plurality of components such as a sounding element, a light-emitting element or a signal emitting device, and the like, so that a warning signal can be sent to a worker in time. Under the effect of this deformation early warning subassembly, the maintenance staff just can in time adjust and restore foundation ditch maintenance, also can in time inform peripheral constructor to withdraw when the potential safety hazard appears, greatly reduced the wind direction of incident emergence.

Further, the block-shaped engaging portion 6a is defined herein mainly for engaging with and driving rotation of the later-described rotation adjusting member 6c, and thus the specific shape between these two portions may be various, for example, a cross-sectional shape may be supported in a straight shape, a triangle shape, a cross shape, or the like.

On the other hand, the oblique supporting rod 5 is not directly embedded in the middle of the soil part of the lower concave surface 3 of the foundation pit, the positioning unit base 4 which is in a cylindrical shape as a whole is extruded and embedded at a certain angle in a specific position on the lower concave surface 3 of the foundation pit, and then the oblique supporting rod 5 is connected and installed with the positioning unit base. Specifically, the whole positioning unit base 4 is also in a column shape, a concave matching hole corresponding to the lower end part of the inclined supporting rod 5 is formed at the part near the upper end of the positioning unit base, and as the inclined supporting rod 5 is rotated and the inclined supporting rod 5 is pushed out relative to the bottom of the adjustable socket 1a, the other end of the inclined supporting rod 5 is inserted into the concave matching hole until being abutted and locked with the inner bottom surface, so that the supporting effect on the vertical wall panel 1 is achieved. Through the size of changing the rotation moment, the supporting acting force of the vertical wall panel 1 to the inner wall surface of the foundation pit can be very accurately controlled, and when the loosening condition occurs, the device can be wholly restored to a stable and reliable supporting effect through rotation again.

The applicant also finds that although the enclosure device can cope with the loosening failure phenomenon possibly generated in the actual use scene through adjustment, in consideration of the large field scale in the actual construction and use process, after the extension of the top of the expense is completed, the device is difficult to adjust one by one so as to ensure enough supporting acting force for the wall surface of the foundation pit. As a further development, the applicant has therefore provided on the reinforcing support assembly 2 a locking and limiting mechanism 8 for preventing the abutment from failing in the deployed state of the device. Specifically, the mechanism includes a mounting portion 8a formed by protruding outwards from the middle section of the oblique ejector rod 5, and two portions of an anti-reversion mounting member 8b connected to and mounted on the mounting portion 8a, wherein the mounting portion 8a is in a circular ring shape, and the anti-reversion mounting member 8b is integrally in a rod shape and has a hook-shaped engaging portion 801 formed on the upper portion thereof for connecting with the mounting portion. In order to flexibly and conveniently install and set, a plurality of identical mounting parts 8a can be formed on the outer peripheral surface of the inclined supporting rod 5 in a surrounding mode with a certain identical interval, so as to flexibly adapt to different actual installation requirements.

When the anti-loosening limiting mechanism 8 is used, the anti-reversion mounting piece is clamped on the mounting part 8a which can drive the rod piece to rotate forward only after installation and debugging are finished, so that the anti-reversion mounting piece 8b is in a natural sagging state. Even if the support enclosure is loosened, the anti-reversion mounting piece 8b can naturally drive the inclined support rod 5 to rotate forward and expand and stretch under the self-use of gravity, so that the generated clearance allowance is compensated, and the stability and reliability of the support effect are ensured.

Further, preferably, in order to facilitate accurate and efficient plugging and installation of the positioning unit base 4 on the ground, a tapered end 4a for breaking hard soil blocks during the early insertion process may be provided at the front end of the positioning unit base 4, and a plurality of fins 4b protruding outward and for preventing the positioning unit base 4 from rotating during the driving adjustment process may be provided on the outer peripheral surface of the positioning unit base 4. Of course, considering that the oblique ejector pin 5, which plays the most important role in transmitting the force, may be damaged by bending during the ejection, it is also possible to provide the bending-resistant reinforcing rib 7 extending in the same direction as the central axis thereof in the middle section where the bending pin most easily occurs.

While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a foundation ditch enclosure supporting device that possesses safety precaution function which characterized in that: the vertical wall plate (1), the reinforced support component (2) and the inclined supporting rod (5) are arranged between the vertical wall plate (1) and the lower concave surface (3) of the foundation pit in a supporting mode, the bottom surfaces of the vertical wall plate (1) and the reinforced support component (2) are inserted below the ground, a triangular supporting structure is formed among the vertical wall plate (1), the reinforced support component (2) and the lower concave surface (3) of the foundation pit, the reinforced support component (2) comprises a positioning unit base (4) which is embedded into the lower ground of the lower concave surface (3) of the foundation pit in an inclined state and an inclined supporting rod (5) which is connected between the vertical wall plate (1) and the positioning unit base (4), the inclined supporting rod (5) is integrally in an inclined state, the upper end of the inclined supporting rod is connected with the outer wall surface of the vertical wall plate (1) in an articulated mode, and the lower end of the inclined supporting rod is fixedly arranged on the positioning unit base (4); the intelligent alarm device is characterized in that a deformation early warning component (9) for detecting bending deformation degree of the inclined supporting rod (5) is arranged in the middle of the inclined supporting rod (5), and the deformation early warning component (9) comprises a sensor module which is arranged in the middle of the inclined supporting rod (5) and used for acquiring local deformation of the inclined supporting rod (5), a processing module for analyzing acquired data, a power module for providing energy for system operation and an alarm module for sending out alarm signals.

2. The foundation pit bracing device with a safety precaution function according to claim 1, wherein: the sensor module comprises a pair of mounting parts (9 a) respectively sleeved on two sides of the middle section of the inclined supporting rod (5), the sensor module is connected with the mounting parts (9 a) on two sides at the same time, and the sensor module, the processing module and the alarm module are electrically connected with each other, so that the alarm is outwards given when the inclined supporting rod (5) is bent and deformed.

3. The foundation pit support roof device with a safety precaution function according to claim 2, wherein: an adjustable inserting seat (1 a) is arranged on the vertical wall panel (1), and the upper end part of the adjustable inserting seat (1 a) is fixedly arranged on the upper part of the outer wall surface of the vertical wall panel (1) in a hinged mode; the oblique supporting rod (5) is in a cylindrical rod state as a whole, a rotary telescopic adjusting mechanism (6) for changing the supporting position of the oblique supporting rod (5) by the adjustable inserting seat (1 a) is formed between the upper end part of the oblique supporting rod (5) and the adjustable inserting seat (1 a), a locking limiting mechanism (8) for preventing supporting effect failure in a device unfolding state is further arranged on the reinforced supporting assembly (2), and the locking limiting mechanism (8) comprises a mounting part (8 a) formed by the outer side of the middle section of the oblique supporting rod (5) in a protruding mode, and an anti-reversing mounting part (8 b) connected to the mounting part (8 a).

4. The foundation pit bracing device with safety precaution function according to claim 3, wherein: the mounting part (8 a) is in a circular ring shape, the whole mounting piece is in a rod shape, and a hook-shaped clamping part (801) for connecting with the mounting part is formed at the upper part of the mounting piece.

5. The foundation pit bracing device with a safety precaution function according to claim 4, wherein: the rotary telescopic adjusting mechanism (6) comprises a block-shaped clamping part (6 a) which protrudes outwards along the axial direction from the upper end part of the inclined supporting rod (5), a threaded adjusting hole (6 b) which is arranged on the adjustable inserting seat (1 a), and a rotary adjusting piece (6 c) which is arranged between the inclined supporting rod (5) and the adjustable inserting seat (1 a); the screwing adjusting piece (6 c) is provided with a clamping notch (601) corresponding to the block-shaped clamping part (6 a) on one side close to the inclined supporting rod (5), and the outer wall of the screwing adjusting piece (6 c) is provided with external threads (602) corresponding to the thread adjusting hole (6 b).

6. The foundation pit support roof device with a safety precaution function according to claim 2, wherein: the upper part of the positioning unit base (4) is provided with a positioning hole which is concave inwards and corresponds to the lower end part of the inclined supporting rod (5), and the lower end part of the inclined supporting rod (5) can be inserted into the positioning hole and rotate around the central axis of the inclined supporting rod.

7. The foundation pit bracing device with a safety precaution function according to claim 6, wherein: and lubricating grease is filled in the positioning holes.

8. The foundation pit bracing device with a safety precaution function according to claim 7, wherein: the middle section of the oblique supporting rod (5) is provided with a bending-resistant reinforcing rib (7) which protrudes outwards and extends in the same direction with the oblique supporting rod (5).

9. The foundation pit support roof device with a safety precaution function according to claim 2, wherein: the positioning unit base (4) is integrally cylindrical, and the bottom end of the positioning unit base (4) protrudes outwards to form a conical end part (4 a).

10. The foundation pit bracing device with a safety precaution function according to claim 9, wherein: and a plurality of fins (4 b) extending in a direction parallel to the axial direction of the positioning unit base (4) are formed around the outer peripheral surface of the positioning unit base (4).