Foundation pit supporting structure special for dam earth excavation operation

Abstract

The utility model provides a foundation pit supporting structure special for dam earth excavation operation. The foundation pit supporting structure comprises an enclosure assembly, a driving assembly and a stretching assembly. The enclosure assembly is composed of pull rods and enclosure plates and fixed to the bottom of a foundation pit through first anchor rods. The stretching assembly is connected with a pull rod and a wheel winding roller through a steel wire, and the wheel winding roller is supported by a wheel winding seat fixed by a second anchor rod in a hard soil layer of the dike top; the driving assembly drives the wheel winding roller to rotate through the gear motor, so that the position of the pull rod is adjusted, the coaming is tightly attached to the side wall of the foundation pit, and stable supporting is formed. The structure is convenient to mount and high in adaptability, and the safety and the construction efficiency in the foundation pit excavation process can be remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy project construction, in particular to a foundation pit support structure dedicated to the earthwork excavation operation of a dam, aiming to provide a support system with stable structure, convenient installation and capable of effectively preventing the collapse of the foundation pit. Background Technique

[0002] During the construction of a dam, the excavation of the foundation pit is an essential and important link. In order to prevent the foundation pit from landsliding during use, a support structure is often required for protection. Support is a retaining, reinforcement and protection measure taken for the side wall and the surrounding environment to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit.

[0003] The patent with the application number CN202110484803.9 provides a foundation pit support structure and a foundation pit, which relates to the technical field of building construction, and includes inclined piles, vertical piles and cross beams. The first end of the inclined pile extends into the bottom surface of the foundation pit to a hard soil layer, and the second end of the inclined pile abuts against the top end of the side wall of the foundation pit; the vertical pile extends into the top of the slope of the foundation pit. A plurality of inclined piles are provided, and the second ends of the plurality of inclined piles are fixedly connected to the cross beam, and one end of the vertical pile extending out of the top of the slope of the foundation pit is fixedly connected to the cross beam. The inclined piles are obliquely extended and fixed at the bottom of the foundation pit, the vertical piles are extended and fixed at the top of the slope of the foundation pit, and one end of the vertical pile extending out of the top of the slope of the foundation pit is fixedly connected to the cross beam on the inclined pile, so as to be fixed to the inclined pile, achieving the support effect, protecting the side wall of the foundation pit and preventing the foundation pit from landsliding. The structure is simple, the construction speed is fast, the applicability is good, and the requirement for the support space is smaller.

[0004] However, the above patent technology has the disadvantages that the support structure has to use internal support, resulting in high support project cost, slow earthwork construction speed and high demolition cost. Therefore, it is particularly important to design an efficient and reliable foundation pit support structure. Content of the Utility Model

[0005] The purpose of the utility model is to provide a foundation pit support structure dedicated to the earthwork excavation operation of a dam, so as to solve the problems raised in the above background technique:

[0006] (1) How to improve the foundation pit support structure to achieve better protection of the side wall of the foundation pit and prevent the foundation pit from landsliding.

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] A foundation pit support structure dedicated to the earthwork excavation operation of a dam;

[0009] It includes an enclosure component, a driving component and a plurality of stretching components;

[0010] The enclosure assembly includes a plurality of tie rods and a plurality of enclosure plates. The plurality of tie rods are arranged at intervals in sequence along the direction of the dam. Both sides of any one enclosure plate are detachably connected to the side walls of two tie rods respectively. The lower end of the tie rod is hinged with a first anchor rod, and the first anchor rod extends into the bottom surface of the foundation pit.

[0011] A plurality of stretching assemblies correspond to the plurality of tie rods of the enclosure assembly one by one. The stretching assembly includes a winding wheel seat, a winding wheel roller and a steel wire. The lower end surface of the winding wheel seat is fixedly connected with a plurality of second anchor rods, and the plurality of second anchor rods extend into the top of the dam. The winding wheel roller is supported on the winding wheel seat. The starting end of the steel wire is fixedly connected to the upper end of the corresponding tie rod of the enclosure assembly, and the ending end of the steel wire is fixedly connected to the winding wheel roller.

[0012] The driving assembly is arranged on the top of the dam. The driving assembly includes a reduction motor and a plurality of transmission shafts. The output shaft of the reduction motor drives the winding wheel rollers of the plurality of stretching assemblies to rotate through the plurality of transmission shafts.

[0013] On the basis of the above technical solution, the present utility model can also be improved as follows.

[0014] Further, the stretching assembly further includes a transition seat and a support rod. The transition seat is located between the winding wheel seat and the enclosure assembly. The lower end surface of the transition seat is fixedly connected with a plurality of third anchor rods, and the plurality of third anchor rods extend into the top of the dam. The lower end of the support rod is fixedly connected to the upper end surface of the transition seat. The horizontal height of the upper end of the support rod is higher than the height of the winding wheel roller of the stretching assembly and the rotation track of the tie rod of the enclosure assembly. The steel wire is fixed after passing around the upper end of the support rod.

[0015] Further, a reinforcing plate is provided between the side wall of the support rod and the upper end surface of the transition seat.

[0016] Further, a first pulley is provided at the upper end of the tie rod of the enclosure assembly, and a second pulley is provided at the upper end of the support rod of the stretching assembly.

[0017] The starting end of the steel wire passes around the second pulley of the support rod and the first pulley of the tie rod in sequence and then is fixed to the upper part of the tie rod.

[0018] Further, a ratchet mechanism is provided on the output shaft of the reduction motor of the driving assembly.

[0019] After adopting such a structure, first install the enclosure assembly, fix the tie rod and the first anchor rod at the edge of the foundation pit, and install the enclosure plate. Subsequently, install the stretching assembly and the driving assembly to ensure that all components are firmly connected. Start the reduction motor, drive the winding wheel roller to rotate through the transmission shaft, and the steel wire winds or unwinds on the winding wheel roller, driving the tie rod to rotate upward or downward. As the tie rod rotates, the enclosure plate gradually presses against the side wall of the foundation pit, forming a stable support structure and effectively preventing the foundation pit from collapsing.

[0020] The beneficial effects of the special foundation pit support structure for the earthwork excavation operation of this dam are as follows:

[0021] (1) Stable structure: Through the synergistic effect of tie rods, retaining plates, first anchor bolts and second anchor bolts, a stable support system is formed to enhance the bearing capacity of the side wall of the foundation pit.

[0022] (2) Convenient installation: The detachable connection method between the retaining plate and the tie rod, as well as the modular design of the stretching component and the driving component, facilitate rapid on-site installation and disassembly.

[0023] (3) Strong adaptability: The number and layout of tie rods and retaining plates can be adjusted according to the actual depth and width of the foundation pit to meet the requirements of different working conditions.

[0024] (4) High degree of automation: The stretching component is automatically controlled through a reduction motor and a transmission shaft, improving construction efficiency and reducing labor intensity. Description of the drawings

[0025] Figure 1 is a schematic structural diagram of an embodiment of a special foundation pit support structure for the earthwork excavation operation of this dam.

[0026] Figure 2 is Figure 1 the top view of

[0027] Figure 3 is Figure 2 the enlarged view of part A of

[0028] Figure 4 is a schematic structural diagram of the ratchet mechanism in an embodiment of a special foundation pit support structure for the earthwork excavation operation of this dam.

[0029] Figure 5 is a cross-sectional view of a schematic structural diagram of the ratchet mechanism in an embodiment of a special foundation pit support structure for the earthwork excavation operation of this dam.

[0030] Explanation of the reference numerals in the drawings:

[0031] Tie rod - 110; Buckle - 111; First pulley - 112; First anchor bolt - 113; Retaining plate - 120; Winding wheel seat - 210; Second anchor bolt - 211; Winding wheel roller - 220; Transition seat - 230; Third anchor bolt - 231; Support rod - 240; Reinforcing plate - 241; Second pulley - 242; Steel wire - 250; Reduction motor - 310; Output shaft - 311; Transmission shaft - 320; Ratchet mechanism - 330; Housing - 331; Ratchet - 332; Stopping claw - 333; Adjusting shaft - 334; Handle - 335; Reed - 336; Top of the dam - 410; Bottom surface of the foundation pit - 420. Detailed implementation manners

[0032] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following specifically describes the embodiments of the present utility model in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0033] As used herein, the terms "vertical", "horizontal", "left", "right" and similar expressions are for illustrative purposes only and do not represent the only embodiments.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] Please refer to Figures 1 to 5 。

[0036] The special foundation pit support structure for the earthwork excavation operation of this dam includes an enclosure component, a driving component and multiple groups of tension components.

[0037] The enclosure component includes a plurality of tie rods 110 and a plurality of retaining plates 120. The plurality of tie rods 110 are arranged at intervals in sequence along the direction of the dam. Both sides of any one retaining plate 120 are detachably connected to the side walls of two tie rods 110 through buckles 111. The lower end of the tie rod 110 is hinged with a first anchor rod 113 through a pin shaft. The first anchor rod 113 is inserted into the bottom surface 420 of the foundation pit, and a first pulley 112 is provided at the upper end of the tie rod 110.

[0038] A support frame is formed by several tie rods 110 and several retaining plates 120 of the enclosure component. Both sides of each retaining plate 120 are connected to the side walls of two adjacent tie rods 110 through detachable connecting pieces (such as bolts, buckles 111, etc.), which is convenient for installation and disassembly. The first anchor rod 113 of the tie rod 110 penetrates deep into the bottom surface 420 of the foundation pit, increasing the anchoring force of the tie rod 110 and improving the overall stability.

[0039] Multiple sets of stretching components correspond one-to-one with multiple tie rods 110 of the enclosure component. The stretching component includes a winding wheel seat 210, a winding wheel roller 220, a steel wire 250, a transition seat 230, and a support rod 240. Four second anchor rods 211 are welded and fixed to the lower end face of the winding wheel seat 210. The four second anchor rods 211 extend into the hard soil layer of the dam top 410. The second anchor rods 211 extend into the hard soil layer of the dam top 410 to ensure the stability of the winding wheel seat 210. The winding wheel roller 220 is supported on the winding wheel seat 210.

[0040] The transition seat 230 is located between the winding wheel seat 210 and the enclosure component. Four third anchor rods 231 are welded and fixed to the lower end face of the transition seat 230. The four third anchor rods 231 extend into the hard soil layer of the dam top 410. The lower end of the support rod 240 is welded to the upper end face of the transition seat 230. A reinforcing plate 241 is provided between the side wall of the support rod 240 and the upper end face of the transition seat 230. The upper end horizontal height of the support rod 240 is higher than the height of the winding wheel roller 220 of the stretching component and the rotation trajectory of the tie rod 110 of the enclosure component. A second pulley 242 is provided at the upper end of the support rod 240. The steel wire 250 bypasses the upper end of the support rod 240.

[0041] The starting end of the steel wire 250 sequentially bypasses the second pulley 242 of the support rod 240 and the first pulley 112 of the tie rod 110 and then is fixed to the upper part of the tie rod 110. The end of the steel wire 250 is fixed to the winding wheel roller 220 to form a tension transmission path.

[0042] The driving component is arranged on the hard soil layer of the dam top 410. The driving component includes a reduction motor 310, a ratchet mechanism 330, and several transmission shafts 320. The output shaft 311 of the reduction motor 310 drives the winding wheel rollers 220 of several stretching components to rotate through several transmission shafts 320. A ratchet mechanism 330 is provided on the output shaft 311 of the reduction motor 310.

[0043] The ratchet mechanism 330 includes a housing 331, a ratchet 332, a pawl 333, and a reed 336. The housing 331 covers the outside of the ratchet 332. The ratchet 332 is installed on the output shaft 311 of the reduction motor 310. The starting end of the pawl 333 is hinged to the inner wall of the housing 331 on the outside of the ratchet 332 through an adjusting shaft 334. The end of the pawl 333 abuts against the gear of the ratchet 332. The starting end of the reed 336 is fixed to the inner wall of the housing 331. The end of the reed 336 abuts against the side wall of the pawl 333 on the side away from the ratchet 332. The housing 331 is welded and fixed to the reduction motor 310. The end of the output shaft 311 of the reduction motor 310 also extends outside the housing 331. The adjusting shaft 334 is supported on the housing 331. The end of the adjusting shaft 334 also extends outside the housing 331. A handle 335 is installed at the end of the adjusting shaft 334 extending outside the housing 331.

[0044] The driving component drives the winding roller 220 of all stretching components to rotate. The winding roller 220 pulls the pull rod 110 of the enclosure component to rotate through the steel wire 250, realizing the winding and unwinding of the steel wire 250 until the pull rod 110 and the enclosure panel 120 abut against the side wall of the foundation pit, playing the role of foundation pit support.

[0045] During operation, first install the enclosure component, fix the pull rod 110 and the first anchor rod 113 at the edge of the foundation pit, and install the enclosure panel 120. Subsequently, install the stretching component and the driving component to ensure that all components are firmly connected. Start the reduction motor 310, drive the winding roller 220 to rotate through the transmission shaft 320, and the steel wire 250 winds or unwinds on the winding roller 220, driving the pull rod 110 to rotate upward or downward. As the pull rod 110 rotates, the enclosure panel 120 gradually presses against the side wall of the foundation pit, forming a stable support structure and effectively preventing the foundation pit from collapsing.

[0046] The above is only one implementation manner of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several modifications and improvements can be made, and these should also be regarded as belonging to the protection scope of the present utility model.

Claims

1. A foundation pit support structure specially used for dam earthwork excavation operation, characterized by: It includes a containment component, a driving component and a plurality of stretching components; The enclosure assembly comprises a plurality of tie rods (110) and a plurality of enclosure plates (120), wherein the plurality of tie rods (110) are sequentially arranged at intervals along the direction of the dam, and the two sides of any enclosure plate (120) are detachably connected to the side walls of two tie rods (110), and the lower end of the tie rod (110) is hinged with a first anchor rod (113), and the first anchor rod (113) extends into the bottom surface (420) of the foundation pit; A plurality of stretching assemblies correspond one to one with a plurality of pull rods (110) of the enclosure assembly, the stretching assemblies comprising a winding wheel seat (210), a winding wheel roller (220) and a steel wire (250), the lower end surface of the winding wheel seat (210) being fixedly connected with a plurality of second anchor rods (211), the plurality of second anchor rods (211) extending into the top (410) of the dam, the winding wheel roller (220) being supported on the winding wheel seat (210), the starting end of the steel wire (250) being fixedly connected with the upper end of the pull rod (110) corresponding to the enclosure assembly, and the end of the steel wire (250) being fixedly connected with the winding wheel roller (220); The driving assembly is arranged on the top (410) of the dam, and comprises a reduction motor (310) and a plurality of transmission shafts (320). The output shaft (311) of the reduction motor (310) drives the winding rollers (220) of the plurality of stretching assemblies to rotate via the plurality of transmission shafts (320).

2. The special foundation pit support structure for dam earthwork excavation operation according to claim 1 is characterized in that: The stretching assembly further comprises a transition seat (230) and a support rod (240). The transition seat (230) is located between the winding wheel seat (210) and the enclosure assembly. The lower end surface of the transition seat (230) is fixedly connected with a plurality of third anchor rods (231). The plurality of third anchor rods (231) extend into the top of the dam (410). The lower end of the support rod (240) is fixedly connected to the upper end surface of the transition seat (230). The upper end of the support rod (240) has a horizontal height higher than the height of the winding wheel roller (220) of the stretching assembly and the rotation track of the pull rod (110) of the enclosure assembly. The steel wire (250) is fixed after passing around the upper end of the support rod (240).

3. The special foundation pit support structure for dam earthwork excavation operation according to claim 2 is characterized by: A reinforcing plate (241) is provided between the side wall of the support rod (240) and the upper end surface of the transition seat (230).

4. The special foundation pit support structure for dam earthwork excavation operation according to claim 3 is characterized by: A first pulley (112) is provided at the upper end of the pull rod (110) of the enclosure assembly, and a second pulley (242) is provided at the upper end of the support rod (240) of the stretching assembly; The starting end of the steel wire (250) is successively passed around the second pulley (242) of the support rod (240) and the first pulley (112) of the pull rod (110) and then fixed to the upper part of the pull rod (110).

5. The special foundation pit support structure for dam earthwork excavation operation according to claim 1 is characterized by: The output shaft (311) of the reduction motor (310) of the driving assembly is also provided with a ratchet mechanism (330).

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