Combined prevention and control of sudden gushing in high-confined water strata for deep foundation pit within pit and construction method

Abstract

The present invention relates to a combined prevention and control deep foundation pit pit-in-pit in a high-confined water formation and a construction method. The construction method includes the following steps: construction platform erection, reinforcement construction of the pit-in-pit, formwork construction, and waterproof coiled material laying. The beneficial effects of the present invention are as follows: A simple steel bar binding bench device is developed. The simple steel bar binding bench is composed of bolts, profiled steel, pin parts, etc., and the binding parameters of the cushion steel bar mesh can be accurately controlled by moving the spacing of the pin parts, reducing the difficulty of binding the cushion steel bar mesh; The hanging platform system is composed of a track groove, a construction platform, telescopic hanging rods, etc., realizing the arbitrary movement of the construction platform in the space of the pit-in-pit and reducing the construction difficulty; The mobile system used can also be used for the subsequent coiled material spreading rack; The attitude adjustment of the steel bar mesh during hoisting is realized through mobile clamping and hoisting, reducing the hoisting difficulty.

Description

Technical Field

[0001] The invention belongs to the field of construction methods for pits within pits, and particularly relates to a combined prevention and control method for deep foundation pit pits within pits in high confined water strata and its construction method. Background Art

[0002] Pits within pits are common accessory structures in building structures, such as sump wells below the base plate of a station, catch basins under escalators at entrances and exits, and elevator shafts for vertical elevators. They are formed by further excavating downward after the foundation pit is excavated to the base, in order to construct the sunken structure. As the deepest part of the foundation pit, rainwater and groundwater are likely to gather here during the excavation process.

[0003] When constructing pits within pits in deep foundation pits, the following problems will be encountered: 1) For the working conditions of ultra-deep pits within pits, traditional workers need to climb up and down ladders frequently to enter the construction site, and the safety of construction workers cannot be guaranteed; 2) Due to the small working surface, it is difficult to carry out in-situ binding of the cushion steel bar mesh and construction of the cushion formwork; 3) Due to the small working surface, it is difficult to lay waterproof coiled materials.

[0004] In view of this, in response to a series of problems that occur during the construction of pits within pits in deep foundation pits, there is an urgent need to invent a simple and effective combined prevention and control system for deep foundation pit pits within pits in high confined water strata, improve the construction efficiency and quality of pits within pits, and reduce safety risks. Summary of the Invention

[0005] The purpose of the invention is to overcome the deficiencies in the prior art and provide a combined prevention and control method for deep foundation pit pits within pits in high confined water strata and its construction method.

[0006] This construction method for a combined prevention and control of deep foundation pit pits within pits in high confined water strata includes the following steps:

[0007] S1. Erection of the construction platform; the hanging platform system extends to the foundation pit through the moving system;

[0008] S2. Construction of the steel bars for the pit within the pit; the cushion steel bar mesh of the pit within the pit in the foundation pit is constructed using a simple steel bar binding rack;

[0009] S3. Formwork construction; install steel formwork in the pit within the pit through the upward-pulling T-bar and screw rod, and adjust the horizontal position of the channel steel by fine-tuning the jack for concrete pouring;

[0010] S4. Laying of waterproof coiled materials; install a coiled material spreading rack on the moving system, and lay waterproof coiled materials on the inner wall of the pit within the pit through the coiled material spreading rack.

[0011] Preferably, the hanging platform system includes a track groove, a construction platform and a telescopic suspension rod, and the moving system includes a track groove and a moving rod. The track groove is arranged on the foundation pit, counterweights are arranged at both ends of the track groove, both ends of the moving rod are arranged on the track groove, the upper end of the telescopic suspension rod is arranged on the moving rod, and the lower end of the telescopic suspension rod is arranged with the construction platform.

[0012] Preferably, the simple steel bar binding jig includes bolts, steel sections and pin members. Pin holes are arranged on the steel sections, and the pin members are arranged on the steel sections through the pin holes; four groups of lifting lugs are arranged on the cushion steel bar mesh. One end of the main lifting rope is connected with the lifting lug, the other end of the main lifting rope is connected with the moving clamping sling, the moving clamping sling is arranged on the hoisting frame, and the main suspension rod and the hoisting frame are connected through a secondary lifting rope.

[0013] Preferably, fine-tuning positioning blocks are arranged above both sides of the pit within a pit, a channel steel is arranged between the two fine-tuning positioning blocks, an upward-pulling T-bar is inserted in the middle of the channel steel, and screw rods are arranged on both sides of the upward-pulling T-bar; ear plates are arranged at both the top and the bottom of the steel formwork. The upward-pulling T-bar is connected to the ear plate at the bottom of the steel formwork, and the screw rod is connected to the ear plate at the top of the steel formwork.

[0014] Preferably, the lower end of the upward-pulling T-bar penetrates into the ear plate at the lower part of the steel formwork from bottom to top, the upper end of the upward-pulling T-bar is inserted into the channel steel, the screw rod is inserted into the ear plate at the upper part of the steel formwork, a free sleeve rod is inserted on the upward-pulling T-bar, the free sleeve rod is fixed by a long screw rod, both ends of the channel steel are arranged on the fine-tuning positioning blocks, fine-tuning jacks are arranged on the fine-tuning positioning blocks, and concrete is poured after the formwork construction is completed.

[0015] Preferably, the coiled material spreading frame includes a hydraulic telescopic rod and a coiled material platform. The coiled material spreading frame is constructed by using a moving system. The moving rod is connected with the hydraulic telescopic rod. A connecting rod is connected to the lower end of the hydraulic telescopic rod. Moving wheels are respectively arranged at both ends of the connecting rod. The moving wheels are attached to the waterproof coiled material. A coiled material platform is arranged outside the moving wheels. Coiled materials are placed on the coiled material platform, and a reserved hole is arranged on the coiled material platform.

[0016] This deep foundation pit pit within a pit with combined prevention and control of sudden gushing in high confined water strata is obtained by any of the above-mentioned methods.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1) The present invention has developed a simple steel bar binding jig device. The simple steel bar binding jig is composed of bolts, steel sections, pin members, etc., and can accurately control the binding parameters of the cushion steel bar mesh by moving the spacing of the pin members, reducing the difficulty of binding the cushion steel bar mesh.

[0019] 2) The present invention has developed a hanging platform system for the pit within a pit. The hanging platform system is composed of a track groove, a construction platform, a telescopic suspension rod, etc., realizing the arbitrary movement of the construction platform in the space of the pit within a pit and reducing the construction difficulty; the moving system used can also be used for the subsequent coiled material spreading frame.

[0020] 3) The present invention proposes a technology for tying reinforcement bars outside the foundation pit and hoisting them as a whole into the pit. By means of a movable clamping hoist, the attitude adjustment of the steel bar mesh during hoisting is achieved, reducing the hoisting difficulty.

[0021] 4) The present invention proposes a technology for casting concrete with standardized formwork. By adopting the form of hanging steel formwork, the difficulty of formwork installation in a narrow-space foundation pit is solved, reducing the construction difficulty and accelerating the construction progress.

[0022] 5) The present invention has developed a coiled material spreading frame, which consists of a hydraulic telescopic rod, a movable rod, a coiled material platform, etc. Through the cooperation of the hydraulic telescopic rod and the movable wheels, the coiled material is made to fit the foundation pit surface, realizing the intelligent operation of coiled material spreading and accelerating the construction progress. Description of the Drawings

[0023] Figure 1 is a schematic diagram of the pit-in-pit system of the present invention;

[0024] Figure 2 is a schematic diagram of a simple steel bar tying jig device;

[0025] Figure 3 is a sectional schematic diagram of the hanging platform system of the pit-in-pit;

[0026] Figure 4 is a top view schematic diagram of the hanging platform system of the pit-in-pit;

[0027] Figure 5 is a schematic diagram of tying reinforcement bars outside the foundation pit with cushion reinforcement and hoisting them as a whole into the pit;

[0028] Figure 6 is a schematic diagram of casting concrete with standardized formwork

[0029] Figure 7 Schematic diagram of the fine-tuning positioning block;

[0030] Figure 8 Schematic diagram of the coiled material spreading frame;

[0031] Figure 9 Schematic diagram of the coiled material platform.

[0032] Description of the reference numerals: 1 - foundation pit, 2 - pit within a pit, 3 - bolt, 4 - pin hole, 5 - pin member, 6 - simple steel bar tying jig, 7 - lifting lug, 8 - cushion steel bar mesh, 9 - main lifting rope, 10 - auxiliary lifting rope, 11 - main lifting rod, 12 - lifting frame, 13 - movable clamping sling, 14 - construction platform, 15 - telescopic lifting rod, 16 - track groove, 17 - counterweight, 18 - cushion, 19 - movable rod, 20 - waterproof coiled material, 21 - movable wheel, 22 - coiled material platform, 23 - coiled material, 24 - outer cover, 25 - hydraulic spring rod, 26 - steel formwork, 27 - ear plate, 28 - upper pull T-bar, 29 - upper pull rod, 30 - fine-tuning positioning block, 31 - free sleeve rod, 32 - channel steel, 33 - fine-tuning jack, 34 - coiled material paving frame, 35 - section steel, 36 - hanging platform system, 37 - screw rod, 38 - long screw rod, 39 - reserved hole, 40 - connecting rod, 41 - movable system. Detailed implementation manners

[0033] The present invention will be further described below in conjunction with embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0034] Embodiment 1

[0035] As an embodiment, as Figures 1 to 9 shown, this construction method for preventing and controlling the sudden gushing of a deep foundation pit with a pit within a pit in a high confined water stratum includes the following steps:

[0036] S1. Erection of the construction platform; the hanging platform system 36 is extended to the foundation pit 1 through the movable system 41; as Figure 3 and Figure 4 shown, the hanging platform system 36 is composed of the construction platform 14, the telescopic lifting rod 15, etc., and the movable system 41 is composed of the track groove 16, the movable rod 19, etc. The track groove 16 is arranged on the foundation pit 1, counterweights 17 are arranged at both ends of the track groove 16, both ends of the movable rod 19 are arranged on the track groove 16, the upper end of the telescopic lifting rod 15 is arranged on the track groove 16, and the lower end of the telescopic lifting rod 15 is arranged with the construction platform 14.

[0037] S2. Steel bar construction of the pit within a pit; the cushion steel bar mesh 8 of the pit within a pit 2 in the foundation pit 1 is constructed using a simple steel bar tying jig 6;

[0038] S3. Formwork construction; the channel steel 32 installs the steel formwork 26 in the pit within a pit 2 through the upper pull T-bar 28 and the screw rod 37, and adjusts the horizontal position of the channel steel 32 through the fine-tuning jack 33 for concrete pouring;

[0039] S4. Waterproof coiled material laying: Install a coiled material spreading frame 34 on the moving system 41, and lay the waterproof coiled material 20 on the inner wall of the pit-in-pit 2 through the coiled material spreading frame 34.

[0040] Embodiment 2

[0041] As another embodiment, this Embodiment 2 is proposed on the basis of Embodiment 1, and a more specific construction method for a deep foundation pit pit-in-pit with combined prevention and control of sudden gushing in high-confined water strata:

[0042] In step S2, as Figure 1 and Figure 2 shown, the cushion steel bar mesh 8 of the pit-in-pit 2 in the foundation pit 1 is constructed by a simple steel bar binding jig 6. The simple steel bar binding jig 6 is composed of bolts 3, section steels 35, pin parts 5, etc. Pin holes 4 are arranged on the section steel 35, and the pin parts 5 are arranged on the section steel 35 through the pin holes 4. Four groups of lifting lugs 7 are arranged on the cushion steel bar mesh 8. One end of the main lifting rope 9 is connected to the lifting lug 7, and the other end of the main lifting rope 9 is connected to the moving clamping crane 13. The moving clamping crane 13 is arranged on the hoisting frame 12, and the main lifting rod 11 and the hoisting frame 12 are connected by a secondary lifting rope.

[0043] In step S3, as Figure 6 and Figure 7 shown, after the construction of the cushion steel bar mesh 8, install the steel formwork 26. Ear plates 27 are arranged on the steel formwork 26. The lower end of the upper pulling T-bar 28 penetrates into the ear plate 27 at the lower part of the steel formwork 26 from bottom to top, and the upper end of the upper pulling T-bar 28 is inserted into the channel steel 32. The screw rod 37 is inserted into the ear plate 27 at the upper part of the steel formwork 26. The free sleeve rod 31 is inserted onto the upper pulling T-bar 28 and fixed by a long screw rod 38. Both ends of the channel steel 32 are arranged on the fine-tuning positioning blocks 30, and fine-tuning jacks 33 are arranged on the fine-tuning positioning blocks 30. After the formwork construction is completed, concrete is poured.

[0044] As Figure 5 shown, four groups of lifting lugs 7 are arranged on the cushion steel bar mesh 8. One end of the main lifting rope 9 is connected to the lifting lug 7, and the other end of the main lifting rope 9 is connected to the moving clamping crane 13. The moving clamping crane 13 is arranged on the hoisting frame 12, and the main lifting rod 11 and the hoisting frame 12 are connected by a secondary lifting rope.

[0045] It should be noted that the parts that are the same or similar to those in Embodiment 1 in this embodiment can be referred to each other and will not be elaborated in this application.

[0046] Embodiment 3

[0047] As another embodiment, this Embodiment 3 is proposed on the basis of Embodiments 1 and 2, and a more specific construction method for a deep foundation pit pit-in-pit with combined prevention and control of sudden gushing in high-confined water strata:

[0048] In step S4, as Figure 8 andFigure 9 As shown, the coiled material spreading frame 34 is composed of a hydraulic telescopic rod 25, a coiled material platform 22, etc. The coiled material spreading frame 34 is constructed using a mobile system 41. The mobile rod 19 is connected to the hydraulic telescopic rod 25. The connecting rod 41 is connected to the lower end of the hydraulic telescopic rod 25. Moving wheels 21 are respectively arranged at both ends of the connecting rod 41. The moving wheels 21 are in close contact with the waterproof coiled material 20. A coiled material platform 22 is arranged outside the moving wheels 21. A coiled material 23 is placed on the coiled material platform 22. A reserved hole 39 is arranged on the coiled material platform 22.

[0049] It should be noted that the parts that are the same or similar to those in the first and second embodiments in this embodiment can be referred to each other and will not be described in detail in this application.

[0050] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

Claims

1. A construction method for a deep foundation pit with a pit-in-pit in a high-confined water stratum to prevent and control sudden gushing and combination, characterized in that, It includes the following steps: S1. Erection of the construction platform; the hanging platform system extends to the foundation pit through the moving system; S2. Reinforcement construction of the pit within a pit; the cushion steel bar mesh of the pit within a pit in the foundation pit is constructed using a simple steel bar binding jig; S3. Formwork construction; fine-tuning positioning blocks are provided above both sides of the pit within a pit, a channel steel is arranged between the two fine-tuning positioning blocks, an upward-pulling T-bar is inserted in the middle of the channel steel, and screw rods are arranged on both sides of the upward-pulling T-bar; ear plates are arranged at both the top and bottom of the steel formwork, the upward-pulling T-bar is connected to the ear plate at the bottom of the steel formwork, and the screw rod is connected to the ear plate at the top of the steel formwork; the steel formwork is installed in the pit within a pit through the upward-pulling T-bar and the screw rod; the lower end of the upward-pulling T-bar passes through the ear plate at the lower part of the steel formwork from bottom to top, the upper end of the upward-pulling T-bar is inserted into the channel steel, the screw rod is inserted into the ear plate at the upper part of the steel formwork, a free sleeve rod is inserted on the upward-pulling T-bar, the free sleeve rod is fixed by a long screw rod, both ends of the channel steel are arranged on the fine-tuning positioning blocks, fine-tuning jacks are arranged on the fine-tuning positioning blocks, and the horizontal position of the channel steel is adjusted by the fine-tuning jacks for concrete pouring; S4. Waterproof coiled material laying; a coiled material spreading frame is installed on the moving system, and the waterproof coiled material is laid on the inner wall of the pit within a pit through the coiled material spreading frame; The hanging platform system includes a construction platform and telescopic suspension rods, and the moving system includes a track groove and a moving rod. The track groove is arranged on the foundation pit, counterweight blocks are arranged at both ends of the track groove, both ends of the moving rod are arranged on the track groove, the upper end of the telescopic suspension rod is arranged on the moving rod, and the lower end of the telescopic suspension rod is arranged with the construction platform; The simple steel bar binding jig includes bolts, profiled steels and pin members. Pin holes are arranged on the profiled steels, and the pin members are arranged on the profiled steels through the pin holes; four groups of lifting ears are arranged on the cushion steel bar mesh, one end of the main lifting rope is connected to the lifting ear, the other end of the main lifting rope is connected to the moving clamping sling, the moving clamping sling is arranged on the lifting frame, and the main lifting rod and the lifting frame are connected by a secondary lifting rope.

2. The construction method for preventing and controlling the sudden gushing of a deep foundation pit within a pit in a high-confined water formation according to claim 1, characterized in that, The coiled material spreading frame includes a hydraulic telescopic rod and a coiled material platform. The coiled material spreading frame is constructed using the moving system. The moving rod is connected to the hydraulic telescopic rod, a connecting rod is connected to the lower end of the hydraulic telescopic rod, moving wheels are respectively arranged at both ends of the connecting rod, the moving wheels are attached to the waterproof coiled material, a coiled material platform is arranged outside the moving wheels, the coiled material is placed on the coiled material platform, and a reserved hole is arranged on the coiled material platform.

3. The combined prevention and control of sudden gushing in high-confined water strata for deep foundation pit within a pit, characterized in that, Obtained by any one of the methods described in claims 1 to 2.

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