Cover-excavation top-down station low-space steel support lifting device

Abstract

The invention relates to the technical field of building construction, and discloses a cover and excavation top-down station low-space steel support lifting device in order to solve the technical problem that traditional lifting equipment is difficult to operate due to the fact that the device is limited by a low space between a top plate and an excavation layer. The supporting leg base is connected with a supporting table through a jacking hydraulic oil cylinder, the supporting table is provided with a hydraulic three-stage sleeve stand column, the top of the hydraulic three-stage sleeve stand column is connected with an electric drive guide rail through a roller connecting device, the bottom of the hydraulic three-stage sleeve stand column is provided with a crawler-type walking device, and the electric drive guide rail is connected with a pulley. An electric hoist is further arranged at the bottom of the hydraulic three-level sleeve stand column and coupled with the pulley through a steel wire rope, and the two ends of the steel wire rope are connected with hanging rings used for being connected with the steel inclined throwing supports. Rapid vertical lifting, accurate alignment and safe and stable installation of the steel support in the narrow space are achieved, and an efficient mechanical solution is provided for underground engineering in the limited space.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly to a lifting device for low-space steel supports of a top-down constructed station. Background Art

[0002] In the construction of the top-down method, after the station roof slab is constructed first, it is necessary to excavate downward in layers and install a steel support bracing structure.

[0003] For example Figures 1 to 7 , the construction process is as follows: 1. Construction preparation → 2. Preliminary works → 3. Site leveling → 4. Construction of diaphragm wall for retaining structure → 5. Construction of steel pipe columns → 6. Earth excavation to 2.7 m below the roof slab → 7. Roof slab construction (cover slab) → 8. Earth excavation to 2.7 m below the middle slab → 9. Middle slab construction → 10. Side walls of the first basement floor → 11. Bottom slab construction → 12. Construction of steel inclined struts → 13. Construction of the remaining bottom slab → 14. Excavation of the remaining earth → 15. Construction of side walls of the second basement floor.

[0004] Specifically

[0005] In the first stage, referring to Figure 1 , construct the station retaining structure such as construction enclosure 11 and steel pipe columns;

[0006] In the second stage, referring to Figure 2 , excavate the earth to 2.7 m below the roof slab 21 and construct the roof slab 21 (north side);

[0007] In the third stage, referring to Figure 3 , excavate the earth to 2.7 m below the roof slab 21;

[0008] In the fourth stage, referring to Figure 4 , construct the roof slab 21 (south side);

[0009] In the fifth stage, referring to Figure 5 , excavate the earth to 2.7 m below the middle slab and construct the middle slab 22 and side walls of the first basement floor;

[0010] In the sixth stage, referring to Figure 6 , excavate to the bottom slab 23 and construct the bottom slab 23, and erect the steel inclined strut 16;

[0011] In the seventh stage, referring to Figure 7 , excavate the remaining earth and construct the bottom slab 23 and side walls of the second basement floor.

[0012] The first stage: Construction of the retaining structure (refer to Figure 1 )

[0013] Construct the construction enclosure and steel pipe columns

[0014] According to the requirements of the design drawings, set up the construction enclosure 11 along the boundary of the station foundation pit, and complete the layout of temporary retaining facilities. Position, measure and install the steel pipe columns at the designated locations, and complete the welding and fixing of the steel pipe columns to the foundation to form the vertical support system of the main structure.

[0015] The second stage: Excavation of the first-floor soil and construction of the north side of the top slab (refer to Figure 2 )

[0016] Excavation of soil

[0017] Use machinery to excavate in layers to a depth of 2.7 m below the design elevation of the top slab (top slab 21). Strictly follow the principle of layered excavation, with the excavation depth of each layer not exceeding 3 m, and monitor the stability of the foundation pit in real time.

[0018] Construction of the north side of the top slab

[0019] After the temporary support is strengthened on the excavation surface, bind the steel bars of the top slab 21, set up the formwork and pour the concrete to form the north-side top slab structure.

[0020] The third stage: Preparation for excavation of the south side of the top slab 21 (refer to Figure 3 )

[0021] Continue the excavation of soil

[0022] After the north-side top slab reaches the strength requirement, extend the excavation southward to a depth of 2.7 m below the design elevation of the top slab to ensure a smooth connection between the excavation surface and the north-side top slab structure.

[0023] The fourth stage: Construction of the south side of the top slab 21 (refer to Figure 4 )

[0024] Pouring of the south side of the top slab

[0025] Complete the steel bar binding, formwork setting and concrete pouring in the south-side excavation area to form a complete top slab structure system.

[0026] The fifth stage: Construction of the middle slab and the side walls of the first basement floor (refer to Figure 5 )

[0027] After the strength of the top slab structure meets the standard, excavate downward to a depth of 2.7 m below the design elevation of the middle slab 22, and carry out support.

[0028] The sixth stage: Construction of the bottom slab 23 and erection of the steel inclined strut 16 (refer to Figure 6 )

[0029] Excavate to the design elevation of the bottom slab 23, and carry out the steel bar binding and concrete pouring of the bottom slab 23 in different areas. Install the steel inclined strut.

[0030] The seventh stage: Excavation of the remaining soil and construction of the second basement floor structure (refer to Figure 7)

[0031] Final earthwork excavation, construction of the floor slab 23 and the side walls of the second basement floor.

[0032] This type of project is an underground two-story intercity railway station constructed using the top-down method. During the construction process, it is necessary to successively complete the construction of the top slab and the layered excavation of the first and second basement floors below the slab. After the construction of the middle slab structure is completed, steel supports need to be erected synchronously during the excavation of the second basement floor foundation pit to support the retaining system. However, limited by the enclosed working environment formed by the top-down method, the operating space height below the slab is only 3 to 7 meters. Due to the insufficient height of traditional excavator hoisting equipment and the limited slewing radius, there are problems such as low positioning accuracy of steel supports, poor installation efficiency, and high risks of falling objects from heights.

[0033] Limited by the low space between the top slab and the excavation layer, it is difficult to operate traditional hoisting equipment (such as tower cranes and truck cranes), and a special lifting device needs to be developed to achieve the precise installation and adjustment of steel supports. Summary of the Invention

[0034] The purpose of the present invention is to provide a low-space steel support lifting device for a top-down inverse construction station to solve the technical problem that it is difficult to operate traditional hoisting equipment due to the low space between the top slab and the excavation layer.

[0035] To achieve the above purpose, the present invention provides a low-space steel support lifting device for a top-down inverse construction station, including a base steel plate serving as the device base. A leg base is provided on the base steel plate, and a support platform is connected to the leg base through a jacking hydraulic cylinder. Four hydraulic three-stage sleeve columns are provided on the support platform. The top of the hydraulic three-stage sleeve column is connected to an electric drive guide rail through a roller connection device. A crawler-type walking device is installed at the bottom of the hydraulic three-stage sleeve column. One end of the electric drive guide rail is connected to a counterweight rod, and a counterweight block is connected to the bottom of the counterweight rod. At least two pulleys are connected to the electric drive guide rail. An electric hoist is further provided at the bottom of the hydraulic three-stage sleeve column. The electric hoist is coupled to the pulley through a steel wire rope, and both ends of the steel wire rope are connected to a sling, and the sling is used to connect the steel diagonal brace.

[0036] The electric hoist realizes the hoisting, lifting, and reduction of frictional resistance of the steel support through an electric drive steel wire rope and a pulley; the hydraulic three-stage sleeve column realizes height adjustment through a hydraulic system by gradually extending, and the maximum extension height is 7 meters, adapting to the vertical lifting requirements of a 3- to 7-meter low space;

[0037] The electric drive guide rail is laid along the pre-installed track at the top of the hydraulic three-stage sleeve column, provides a horizontal movement path through electric drive, and realizes the precise translation and positioning of the steel support;

[0038] The base steel plate, as the device base, is connected to the hydraulic three-stage sleeve column, and prevents overturning during hydraulic operation by expanding the support area.

[0039] Furthermore, the hydraulic triple-stage sleeve column adopts a nested hydraulic cylinder structure, and each section of the sleeve realizes step-by-step positioning through a hydraulic locking mechanism, with the telescopic stroke error ≤ ±5 mm.

[0040] Furthermore, the electric hoist is equipped with a double braking system, including an electromagnetic brake and a mechanical ratchet brake, and the pulley block adopts a three-fold rope winding method.

[0041] Furthermore, the electric drive guide rail includes a linear guide rail pair and a servo motor drive system, with a positioning accuracy of ±2 mm / m, and a laser positioning sensor is provided at the end.

[0042] The low-space steel support lifting device for a top-down reverse construction station provided by the present invention has the following advantages:

[0043] The low-space steel support lifting device for a top-down reverse construction station provided by the present invention, through the telescopic design of the hydraulic triple-stage sleeve column and the bottom crawler walking device, effectively solves the problems of low steel support positioning accuracy, poor installation efficiency, and high risk of falling objects at high altitudes caused by insufficient height and limited rotation of traditional lifting equipment in a low space of 3-7 meters. Its compact structure can flexibly adjust the height and accurately position in a narrow space. With the coordinated operation of the electric drive guide rail, pulley block, and electric hoist, three-dimensional precise installation of the steel support is achieved (positioning error ≤ ±5 mm). The synchronous lifting of the double lifting rings significantly improves symmetry and safety; at the same time, the dynamic balance system of the counterweight rod and counterweight blocks prevents overturning, and the dual hydraulic and electric drives ensure smooth operation, and no large equipment investment is required, reducing construction costs and construction periods. The low-noise and low-energy-consuming electric system meets the requirements of green construction. The modular design is convenient for maintenance and transportation. Overall, it provides an efficient, safe, and economical solution for the reverse construction method of underground stations, significantly improving the construction quality and progress of foundation pit support under complex space conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic structural diagram of the first construction state provided by the present invention;

[0045] Figure 2 It is a schematic structural diagram of the second construction state provided by the present invention;

[0046] Figure 3 It is a schematic structural diagram of the third construction state provided by the present invention;

[0047] Figure 4 It is a schematic structural diagram of the fourth construction state provided by the present invention;

[0048] Figure 5 It is a schematic structural diagram of the fifth construction state provided by the present invention;

[0049] Figure 6Schematic diagram of the sixth construction state provided by the present invention;

[0050] Figure 7 Schematic diagram of the seventh construction state provided by the present invention;

[0051] Figure 8 Plan view of the low-space steel support lifting device provided by the present invention;

[0052] Figure 9 Sectional view step 1 diagram of the low-space steel support lifting device provided by the present invention;

[0053] Figure 10 Sectional view step 2 diagram of the low-space steel support lifting device provided by the present invention;

[0054] Figure 11 Sectional view step 3 diagram of the low-space steel support lifting device provided by the present invention.

[0055] In the figure: 11, construction enclosure; 12, diaphragm wall; 13, capping beam; 14, steel pipe column; 15, column pile; 16, steel inclined bracing; 17, sheet pile; 21, top slab; 22, middle slab; 23, bottom slab; 100, foundation steel plate; 101, leg base; 102, jacking hydraulic cylinder; 103, hydraulic three-stage sleeve column; 104, electric drive guide rail; 105, crawler-type traveling device; 106, electric hoist; 107, pulley; 108, lifting ring; 109, roller connection device; 110, counterweight rod; 111, horizontal crossbar guide rail. Detailed implementation manners

[0056] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0057] Refer to Figures 8 to 11, the present invention provides a low-space steel support lifting device for a top-down inverse construction station, including a foundation steel plate 100 serving as the device base. A leg base 101 is provided on the foundation steel plate 100, and a support platform is connected to the leg base 101 through a jacking hydraulic cylinder 102. Four hydraulic three-stage sleeve columns 103 are provided on the support platform. The top of the hydraulic three-stage sleeve column 103 is connected to an electric drive guide rail 104 through a roller connection device 109. A crawler walking device 105 is installed at the bottom end of the hydraulic three-stage sleeve column 103. One end of the electric drive guide rail 104 is connected to a counterweight rod 110, and a counterweight block is connected to the bottom of the counterweight rod 110. At least two pulleys 107 are connected to the electric drive guide rail 104. An electric hoist 106 is further provided at the bottom of the hydraulic three-stage sleeve column 103. The electric hoist 106 is coupled with the pulley 107 through a steel wire rope, and both ends of the steel wire rope are connected with a lifting ring 108. The lifting ring 108 is used to connect the steel inclined strut 16.

[0058] The electric hoist 106 realizes the hoisting, lifting and reduction of frictional resistance of the steel support through an electric drive steel wire rope cooperating with the pulley 107; the hydraulic three-stage sleeve column 103 realizes height adjustment through the step-by-step extension of the hydraulic system, and the maximum extension height is 7 meters, adapting to the vertical lifting requirements of low spaces of 3 to 7 meters;

[0059] The electric drive guide rail 104 is laid along the pre-installed track at the top end of the hydraulic three-stage sleeve column 103, provides a horizontal movement path through electric drive, and realizes the precise translation and positioning of the steel support;

[0060] The foundation steel plate 100, as the device base, is connected to the hydraulic three-stage sleeve column 103, and prevents overturning during hydraulic operation by expanding the support area;

[0061] Furthermore, the hydraulic three-stage sleeve column 103 adopts a nested hydraulic cylinder structure, and each section of the sleeve realizes step-by-step positioning through a hydraulic locking mechanism, and the telescopic stroke error ≤ ±5mm.

[0062] Furthermore, the electric hoist 106 is configured with a double braking system, including an electromagnetic brake and a mechanical ratchet brake, and the pulley 107 group adopts a three-fold rope winding method.

[0063] Furthermore, the electric drive guide rail 104 includes a linear guide rail pair and a servo motor drive system, the positioning accuracy reaches ±2mm / m, and a laser positioning sensor is provided at the end.

[0064] Working principle:

[0065] The hydraulic three-stage sleeve column 103: realizes the flexible adjustment of the column height (the maximum extension height is 7 meters) by step-by-step extending the hydraulic three-stage sleeve structure through the hydraulic system, and adapts to the vertical lifting requirements of low spaces of 3 to 7 meters.

[0066] Electric hoist 106: Installed at the bottom of the hydraulic triple-stage telescopic column 103, it completes the hoisting and lifting of the steel support through electric drive of the steel wire rope, and combines with the pulley 107 group to reduce the load friction resistance.

[0067] Electric drive guide rail 104: Laid along the pre-installed track at the top of the column, it provides a horizontal movement path through electric drive to achieve precise translation and positioning of the steel support.

[0068] Base steel plate 100: As the device base, it ensures overall stability and prevents overturning during the operation of the hydraulic system.

[0069] Crawler walking device: It realizes power transmission through the drive of the hydraulic system. The idler wheels support the weight of the equipment and disperse the ground pressure. The guide wheels and the tensioning device cooperate to keep the crawler track stable, adapting to complex terrains such as muddy ground and slopes.

[0070] Installation steps

[0071] 1. Foundation preparation: Clean the working surface and lay the base steel plate 100, the jacking hydraulic cylinder 102, the leg base 101 and the crawler walking device;

[0072] 2. Install the hydraulic drive triple-stage telescopic column 103, and connect the hydraulic pump station and the control system;

[0073] 3. Erect the crossbar, the electric drive guide rail 104, the roller connection device 109 and the counterweight bar 110 at the top of the column, and dock with the suspension device track;

[0074] 4. Install the electric hoist 106 at the bottom of the column, and debug the pulley 107 group and the steel wire rope tension;

[0075] 5. Steel support installation process

[0076] (1) The crawler walking device moves to the steel support installation position, and the jacking cylinder lifts the device foundation to ensure overall stability;

[0077] (2) Start the hydraulic system to gradually lift the telescopic column to the target height; Fix the steel support with the steel wire rope, and use the electric hoist 106 to pull the steel wire rope to lift the steel support to the fixed height;

[0078] (3) Move the suspension device along the electric drive guide rail 104, and move the steel support horizontally through electric control;

[0079] (4) The roller guide rail is fine-tuned along the horizontal transverse guide rail 111, and the electric hoist 106 pulls the steel wire rope to lower it to the appropriate position to complete the installation of the steel support.

[0080] Advantages of the device: The retracted height of the three-stage sleeve column 103 is less than 3 meters, and the extended height can reach 7 meters, which is suitable for low and enclosed spaces; it is driven by the cooperation of hydraulic and electric power, with higher efficiency than traditional processes; problems such as insufficient lifting height and limited slewing of excavators are avoided.

[0081] The top-down and reverse construction station low-space steel support lifting device provided by the present invention has the following advantages:

[0082] The present invention realizes the rapid vertical lifting, precise alignment and safe and stable installation of steel supports in narrow spaces through a hydraulic three-stage sleeve column, a crawler-type walking device, an electric hoist and an electric drive guide rail, effectively solving the efficiency bottleneck of traditional processes and providing an efficient mechanized solution for similar underground projects in restricted spaces.

[0083] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-space steel support lifting device for a cover-excavation reverse construction station, characterized in that: include: A basic steel plate (100) serving as the base of the device; The base steel plate (100) is provided with a leg base (101), the leg base (101) is connected to a support platform via a lifting hydraulic cylinder (102), the support platform is provided with four hydraulic three-stage sleeve columns (103), the top of the hydraulic three-stage sleeve columns (103) is connected to an electric drive guide rail (104) via a roller connecting device (109), and the bottom end of the hydraulic three-stage sleeve column (103) is installed with a crawler walking device (105). One end of the electric drive rail (104) is connected to a counterweight rod (110), and the bottom edge of the counterweight rod (110) is connected to a counterweight block. The electric drive rail (104) is connected to at least two pulleys (107). The bottom of the hydraulic three-stage sleeve column (103) is also provided with an electric hoist, and the electric hoist is coupled to the pulley (107) through a steel wire rope. Both ends of the steel wire rope are connected to lifting rings (108), and the lifting rings (108) are used to connect to the steel diagonal brace (16).

2. The low-space steel support lifting device for cover-cut reverse construction station according to claim 1 is characterized in that: The hydraulic three-stage sleeve column (103) adopts a nested hydraulic cylinder structure, and each sleeve section is positioned step by step through a hydraulic locking mechanism.

3. The low-space steel support lifting device for cover-excavation reverse construction station according to claim 2 is characterized in that: The electric hoist is equipped with a double braking system, including an electromagnetic brake and a mechanical ratchet brake, and the pulley (107) group adopts a triple-rate rope winding method.

4. The low-space steel support lifting device for cover-excavation reverse construction station according to claim 2 is characterized in that: The electric drive guide rail (104) comprises a linear guide rail pair and a servo motor drive system, and a laser positioning sensor is provided at the end.

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