Pit-in-pit supporting structure for elevator shaft in soft soil area

Abstract

The utility model discloses a soft soil area elevator shaft pit-in-pit supporting structure which comprises soft soil, a shaft pit is arranged in the soft soil, a fixing plate is fixed to the side face of a cement column through a first expansion screw, and a reinforcing plate, a reinforcing rod, a supporting rod and an inclined support can be fixedly installed conveniently. The inner side of the pit-in-pit enclosure can be reinforced and supported through the design of the reinforcing plates, the supporting strength is improved, the reinforcing plates can be reinforced and supported through the design of the fixing plates, the reinforcing rods, the supporting rods and the inclined supports, and the bending deformation resistance of the reinforcing plates is improved; the fixing block is fixedly installed on the surface of soft soil through the second expansion screw, the safety fence plate is fixedly installed conveniently, the entrance is opened by rotating the safety door, the magnetic block is driven to be separated from and attracted to the safety fence plate, constructors can enter a well pit conveniently for construction operation, and the safety can be improved through the design of the safety fence plate and the safety door; and non-professional constructors are prevented from entering the well pit to cause safety accidents.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a pit support structure for an elevator shaft in a soft soil area. Background Art

[0002] In the ultra-deep foundation pit support in soft soil areas, because the soft soil layer on the site is of poor quality, with the "three highs" characteristics of high water content, high compressibility, high rheology and creep, the deformation of the pit support structure in the elevator pit is large. Therefore, it is necessary to consider taking necessary measures to strengthen the treatment of the elevator pit.

[0003] At present, for ultra-deep foundation pits in elevator pits in soft soil areas, without using internal supports, the force and deformation characteristics of the two hinged arches of the tie rods are used, and the support piles are reasonably arranged, and anchor cable tie rods and trusses are used on the crown beams on each side of the elevator pit. Through theoretical derivation such as the linear superposition principle and actual working condition analysis, a calculation method for the prestress value applied twice by the anchor cable is given, which improves the overall bending resistance of the support system, effectively solves the problem of displacement control of the elevator pit support in deep soft soil areas, and satisfies the overall force balance of the foundation pit. Through the practice of engineering cases, the effectiveness and applicability of the method proposed in the present invention are demonstrated, and the construction period is shortened, the project cost is reduced, and the construction operation is simple and convenient, which is of great value for promotion and application.

[0004] For example, the authorization number CN115726367A discloses a pit support structure for an elevator pit in an ultra-deep foundation pit in a soft soil area, which is suitable for the situation where the pit in the elevator pit is a regular quadrilateral and there is soft soil on the side walls and the base, and the depth of the pit in the elevator pit is between 3.8 and 5.5 m, and is characterized in that: the support structure includes a pit-in-pit retaining structure formed around the pit in the elevator pit by bored cast-in-place piles, crown beams and tensioning anchor cables distributed on each pit side of the pit in the elevator pit, connecting plates and strips arranged at each inner corner of the pit-in-pit retaining structure, and trusses arranged between each crown beam and tensioning anchor cable and each pit side of the pit retaining structure, each long side support axis and short side support axis of the pit-in-pit retaining structure are arched toward the outside of the pit in the elevator pit, and the long side support axis and short side support axis after arching are aligned with each other. The supporting axis is changed from the original straight line to a parabola with an arching degree of 3 / 100 to 6 / 100, and the middle 1 / 4 to 1 / 3 length of each parabola is set as a straight section, and the distance between the straight section and the supporting axis before the arching is 0.5 to 2m; the crown beam tensioning anchor cables are distributed at the long side supporting axis and the short side supporting axis of the pit-in-pit retaining structure before the arching, and the two ends of each group of crown beam tensioning anchor cables are respectively anchored on the bored cast-in-place pile crown beams at two adjacent corners of the pit-in-pit retaining structure, and the truss is arranged between the straight section of the pit-in-pit retaining structure after the arching and the crown beam tensioning anchor cables; the connecting plate belt is arranged between the long side crown beam and the short side crown beam of the pit-in-pit retaining structure, and its two sides are overlapped and connected with the long side crown beam and the short side crown beam respectively, and the overlapping length is 1.6 to 2.0m. However, the pit-in-pit support structure of the ultra-deep foundation pit elevator pit in such soft soil areas has limited support strength, and non-professional construction workers can easily enter the pit and cause safety accidents.

[0005] It can be seen from the solutions disclosed in the above-mentioned existing patent documents that the support strength of the pit-in-pit enclosure is limited, and non-professional construction workers can easily enter the pit and cause safety accidents. Therefore, it is necessary to improve the existing technology. Utility Model Content

[0006] The utility model aims to provide an elevator pit support structure in a soft soil area to solve the problem that the pit-in-pit enclosure support strength is limited and non-professional construction personnel can easily enter the pit and cause safety accidents.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pit support structure for an elevator pit in a soft soil area, comprising soft soil, a pit is arranged inside the soft soil, a pit-in-pit enclosure is installed inside the pit, a cement column is fixedly cast inside the pit, a fixing plate is tightly attached to the side of the cement column, a reinforcing plate is fixedly welded to the side of the fixing plate, a reinforcing rod is fixedly welded to the side of the fixing plate, a support rod is fixedly welded to the side of the fixing plate, an oblique support is fixedly welded to the side of the reinforcing plate, a first expansion screw is fixedly installed inside the fixing plate, a safety railing is fixedly installed on the surface of the soft soil, a fixing block is fixedly welded inside the safety railing, a second expansion screw is fixedly installed inside the fixing block, an inlet is arranged inside one side of the safety railing, an axle support is fixedly installed on one side of the safety railing, and a support shaft is slidably sleeved inside the axle support.

[0008] Preferably, a reinforcing rod is fixedly welded to the inner side of the reinforcing plate, a supporting rod is fixedly welded to the inner side of the reinforcing plate, and a first expansion screw is fixedly installed inside the cement column. By using the first expansion screw to fix the fixing plate to the side of the cement column, it is convenient to fix and install the reinforcing plate, reinforcing rod, supporting rod and oblique support.

[0009] Preferably, the inner side of the pit-in-pit enclosure is close to the cement column, the outer side of the pit-in-pit enclosure is close to the soft soil, the surface of the pit is close to the reinforcement plate, and the inner side of the pit-in-pit enclosure is close to the reinforcement plate. The design of the reinforcement plate can provide reinforced support for the inner side of the pit-in-pit enclosure to improve the support strength.

[0010] Preferably, a support rod is fixedly welded to one side of the reinforcing rod, and an oblique support is fixedly welded to one side of the reinforcing rod. The design of the fixed plate, reinforcing rod, support rod and oblique support can strengthen the support of the reinforcing plate and improve the reinforcing plate's ability to resist bending deformation.

[0011] Preferably, the surface of the soft soil is in close contact with the fixing block, and the second expansion screws are fixedly installed inside the soft soil. By using the second expansion screws, the fixing block is fixedly installed to the surface of the soft soil, which facilitates the fixed installation of the safety railing.

[0012] Preferably, a safety door is closely attached to one side of the safety railing, and a safety door is closely attached to one side of the entrance. A magnetic block is fastened and adsorbed to one side of the safety railing. By rotating the safety door to open the entrance, the magnetic block is driven to detach from the adsorbed safety railing, making it convenient for construction personnel to enter the pit for construction work.

[0013] Preferably, a safety door is fixedly connected to one side of the support shaft, and a magnetic block is fixedly adhered to one side of the safety door. The design of the safety railing and the safety door can improve safety and prevent non-professional construction workers from entering the well pit and causing safety accidents.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model uses the first expansion screw to fix the fixing plate to the side of the cement column, which is convenient for fixing and installing the reinforcing plate, reinforcing rod, support rod and oblique support. The design of the reinforcing plate can strengthen the support of the inner side of the pit-in-pit enclosure to improve the support strength. The design of the fixing plate, reinforcing rod, support rod and oblique support can strengthen the support of the reinforcing plate and improve the reinforcing plate's ability to resist bending deformation.

[0016] 2. The utility model uses the second expansion screw to fix the fixing block to the soft soil surface, which is convenient for fixing and installing the safety guardrail. By turning the safety door to open the entrance, the magnetic block is driven to detach from the adsorbed safety guardrail, which is convenient for construction personnel to enter the pit for construction work. The design of the safety guardrail and the safety door can improve safety and prevent non-professional construction personnel from entering the pit and causing safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is an enlarged stereoscopic view of the reinforcement plate of the utility model;

[0019] Figure 3 This is an enlarged stereoscopic view of the safety guardrail of the utility model;

[0020] Figure 4 It is an enlarged stereoscopic view of the safety door of the utility model.

[0021] In the figure: 1 soft soil, 11 well pit, 12 pit enclosure, 13 cement column, 14 fixed plate, 15 reinforcement plate, 16 reinforcement rod, 17 support rod, 18 oblique support, 19 first expansion screw, 2 safety railing, 21 fixed block, 22 second expansion screw, 23 inlet, 24 shaft support, 25 support shaft, 26 safety door, 27 magnetic block. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-4The figure shows a pit support structure for an elevator shaft in a soft soil area, comprising soft soil 1, a pit 11 is arranged inside the soft soil 1, a pit enclosure 12 is installed inside the pit 11, a cement column 13 is fixedly cast inside the pit 11, a fixing plate 14 is tightly attached to the side of the cement column 13, a reinforcing plate 15 is fixedly welded to the side of the fixing plate 14, a reinforcing rod 16 is fixedly welded to the side of the fixing plate 14, a support rod 17 is fixedly welded to the side of the fixing plate 14, an oblique support 18 is fixedly welded to the side of the reinforcing plate 15, a first expansion screw 19 is fixedly installed inside the fixing plate 14, a safety railing 2 is fixedly installed on the surface of the soft soil 1, a fixing block 21 is fixedly welded inside the safety railing 2, a second expansion screw 22 is fixedly installed inside the fixing block 21, an inlet 23 is arranged inside one side of the safety railing 2, a shaft support 24 is fixedly installed on one side of the safety railing 2, and a support shaft 25 is slidably sleeved inside the shaft support 24.

[0024] In order to improve the support of the pit enclosure 12 in the pit, a reinforcing rod 16 is fixedly welded on the inner side of the reinforcing plate 15, a supporting rod 17 is fixedly welded on the inner side of the reinforcing plate 15, and a first expansion screw 19 is fixedly installed inside the cement column 13. By using the first expansion screw 19 to fix the fixing plate 14 to the side of the cement column 13, it is convenient to fix and install the reinforcing plate 15, the reinforcing rod 16, the supporting rod 17 and the oblique support 18, the inner side of the pit enclosure 12 in the pit is close to the cement column 13, and the outer side of the pit enclosure 12 in the pit is close to Soft soil 1, the surface of the well pit 11 is in close contact with the reinforcing plate 15, and the inner side of the pit-in-pit enclosure 12 is in close contact with the reinforcing plate 15. The design of the reinforcing plate 15 can provide reinforced support for the inner side of the pit-in-pit enclosure 12 to improve the support strength. A support rod 17 is fixedly welded on one side of the reinforcing rod 16, and an oblique support 18 is fixedly welded on one side of the reinforcing rod 16. The design of the fixed plate 14, the reinforcing rod 16, the support rod 17 and the oblique support 18 can provide reinforced support for the reinforcing plate 15 to improve the reinforcing plate 15's ability to resist bending deformation.

[0025] In order to improve safety, the surface of the soft soil 1 is tightly attached to the fixed block 21, and the second expansion screw 22 is fixedly installed inside the soft soil 1. The fixed block 21 is fixedly installed to the surface of the soft soil 1 by using the second expansion screw 22, so that the safety railing 2 can be fixedly installed. A safety door 26 is tightly attached to one side of the safety railing 2, and a safety door 26 is tightly attached to one side of the entrance 23. A magnetic block 27 is fastened and adsorbed on one side of the safety railing 2. The entrance 23 is opened by rotating the safety door 26, and the magnetic block 27 is driven to separate from the adsorbed safety railing 2, so that construction personnel can enter the interior of the well pit 11 for construction work. A safety door 26 is fixedly connected to one side of the support shaft 25, and a magnetic block 27 is fixedly adhered to one side of the safety door 26. The design of the safety railing 2 and the safety door 26 can improve safety and prevent non-professional construction personnel from entering the well pit 11 and causing safety accidents.

[0026] The pit-in-pit support structure of the elevator pit in the soft soil area uses the first expansion screw 19 to fix the fixed plate 14 to the side of the cement column 13, so as to facilitate the fixed installation of the reinforcing plate 15, the reinforcing rod 16, the support rod 17 and the oblique support 18. The design of the reinforcing plate 15 can strengthen the support of the inner side of the pit-in-pit enclosure 12 to improve the support strength. The design of the fixed plate 14, the reinforcing rod 16, the support rod 17 and the oblique support 18 can strengthen the support of the reinforcing plate 15 to improve the bending deformation resistance of the reinforcing plate 15; the second expansion screw 22 is used to fix the fixed block 21 to the surface of the soft soil 1, so as to facilitate the fixed installation of the safety railing 2, and the entrance 23 is opened by rotating the safety door 26 to drive the magnetic block 27 to detach from the adsorbed safety railing 2, so as to facilitate the construction personnel to enter the pit 11 for construction work. The design of the safety railing 2 and the safety door 26 can improve the safety and prevent non-professional construction personnel from entering the pit 11 and causing safety accidents.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pit support structure for an elevator pit in a soft soil area, comprising soft soil (1), a pit (11) being arranged inside the soft soil (1), a pit-in-pit enclosure (12) being installed inside the pit (11), and a cement column (13) being fixedly cast inside the pit (11), characterized in that: The side of the cement column (13) is tightly attached to a fixing plate (14), the side of the fixing plate (14) is fixedly welded with a reinforcing plate (15), the side of the fixing plate (14) is fixedly welded with a reinforcing rod (16), the side of the fixing plate (14) is fixedly welded with a supporting rod (17), the side of the reinforcing plate (15) is fixedly welded with an oblique support (18), the inside of the fixing plate (14) is fixedly installed with a first expansion screw (19), the surface of the soft soil (1) is fixedly installed with a safety railing (2), the inside of the safety railing (2) is fixedly welded with a fixing block (21), the inside of the fixing block (21) is fixedly installed with a second expansion screw (22), one side of the safety railing (2) is internally provided with an inlet (23), one side of the safety railing (2) is fixedly installed with an axle support (24), the inside of the axle support (24) is slidably sleeved with a support shaft (25).

2. The pit support structure for an elevator pit in a soft soil area according to claim 1, characterized in that: A reinforcing rod (16) is fixedly welded to the inner side of the reinforcing plate (15), a supporting rod (17) is fixedly welded to the inner side of the reinforcing plate (15), and a first expansion screw (19) is fixedly installed inside the cement column (13).

3. The pit support structure for an elevator shaft in a soft soil area according to claim 1, characterized in that: The inner side of the pit-in-pit enclosure (12) is in close contact with the cement column (13), the outer side of the pit-in-pit enclosure (12) is in close contact with the soft soil (1), the surface of the well pit (11) is in close contact with the reinforcement plate (15), and the inner side of the pit-in-pit enclosure (12) is in close contact with the reinforcement plate (15).

4. The pit support structure for an elevator shaft in a soft soil area according to claim 1, characterized in that: A support rod (17) is fixedly welded to one side of the reinforcing rod (16), and an oblique support (18) is fixedly welded to one side of the reinforcing rod (16).

5. The pit support structure for an elevator shaft in a soft soil area according to claim 1, characterized in that: The surface of the soft soil (1) is in close contact with the fixing block (21), and the interior of the soft soil (1) is fixedly installed with a second expansion screw (22).

6. The pit support structure for an elevator shaft in a soft soil area according to claim 1, characterized in that: A safety door (26) is in close contact with one side of the safety fence (2), a safety door (26) is in close contact with one side of the entrance (23), and a magnetic block (27) is fastened and adsorbed on one side of the safety fence (2).

7. The pit support structure for an elevator shaft in a soft soil area according to claim 1, characterized in that: A safety door (26) is fixedly connected to one side of the support shaft (25), and a magnetic block (27) is fixedly adhered to one side of the safety door (26).

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