A low-height support device applied to cast-in-situ beam construction above a subway

Abstract

The application discloses a low-height support device applied to cast-in-situ beam construction above a subway, which comprises two concrete bases constructed on both sides of the ground surface above the subway, and a lower sliding rail is arranged on each of the two concrete bases; an inclined support frame is connected to each of the lower sliding rails, and the upper ends of the inclined support frames on the two lower sliding rails are close to each other; the upper ends of each of the inclined support frames are connected to an upper sliding rail; the upper sliding rail is arranged above the two lower sliding rails and is parallel to the lower sliding rails, and the upper sliding rail and the lower sliding rails have the same guide direction; the upper and lower ends of each of the inclined support frames are respectively connected to a clutch mechanism; and the two clutch mechanisms are connected to the upper sliding rail and the lower sliding rail respectively. The low-height support device can avoid that the soil foundation above the subway bears external force, thereby ensuring the structural strength of the soil foundation above the subway and avoiding the soil foundation from floating or collapsing and the like. The low-height support device is suitable for the technical field of cast-in-situ beam construction above a subway in building construction.

Description

A low-height support device for the construction of cast-in-place beams above subway stations Technical Field

[0001] This invention belongs to the technical field of cast-in-place beam construction, specifically, it relates to a low-height support device for cast-in-place beam construction above subways. Background Technology

[0002] In the construction of cast-in-place beams, a support system is required to ensure the smooth progress of subsequent formwork support work. To guarantee the overall strength and stability of the support system, existing systems often employ a dense structure. This involves laying wooden blocks or pads on the ground, placing a base support on top of the blocks, installing ground bracing above the base support, and adding scissor bracing in both the longitudinal and transverse directions to increase the rigidity and stability of the support. A top support is then installed on top. However, this type of support system presents a significant challenge during subway construction. The construction of the support system necessitates excavation of the soil above the subway, which can affect the structural quality of the subway subgrade and easily lead to soil uplift. Furthermore, once the entire support system is erected above the subway, the system bears considerable weight during rebar tying and pouring operations. This weight is then transferred to the subgrade above the subway, causing significant downward pressure on the subgrade and potentially disrupting its balance. Summary of the Invention

[0003] This invention provides a low-height support device for the construction of cast-in-place beams above subways, which is used to avoid the soil foundation above the subway bearing external forces, thereby ensuring the structural strength of the soil foundation above the subway and preventing situations such as soil foundation floating or collapse.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A low-height support device for the construction of cast-in-place beams above a subway includes two concrete foundations constructed on both sides of the ground above the subway. A lower slide rail is installed on each of the two concrete foundations, and an inclined support frame is connected to each of the lower slide rails. The upper ends of the inclined support frames on the two lower slide rails are close to each other, and the upper end of each inclined support frame is connected to an upper slide rail. The upper slide rail is positioned above the two lower slide rails and parallel to them, and the upper and lower slide rails have the same guiding direction. A clutch mechanism is connected to the upper and lower ends of each inclined support frame, and the two clutch mechanisms are respectively connected to the upper and lower slide rails.

[0006] Furthermore, the inclined support frame includes multiple diagonal braces arranged side by side. Adjacent diagonal braces are connected to each other by multiple first connecting rods. These first connecting rods are spaced apart along the inclination direction of the diagonal braces, and the two ends of each first connecting rod are connected to two diagonal braces. A bent rod is constructed on each diagonal brace on the side away from the other inclined support frame. The two ends of the bent rod are respectively connected to the diagonal brace, and the middle part of the bent rod is connected to the diagonal brace via an inclined rod. Adjacent bent rods are connected to each other by multiple second connecting rods. These second connecting rods are spaced apart along the extension direction of the bent rod, and the two ends of each second connecting rod are connected to two bent rods.

[0007] Furthermore, the clutch mechanism includes clutch components respectively disposed at the upper or lower ends of each diagonal brace; both the upper and lower slide rails include multiple slide rail bodies connected side by side, and each clutch component is assembled between the slide rail body and the corresponding ends of the diagonal brace.

[0008] Furthermore, the clutch component includes clutch seats disposed opposite to each other on both sides of the diagonal brace and slidably connected to the slide rail body. A connecting shaft is fixedly connected to the end of the diagonal brace. A limiting gear is fixedly mounted on both sides of the connecting shaft. A limiting internal gear ring and a connecting hole with the same axis are constructed on the clutch seat. When the limiting gear and the limiting internal gear ring are coaxially assembled, the end of the connecting shaft extends out of the corresponding connecting hole. Connecting ears are constructed on both sides of the clutch seat. The corresponding connecting ears of the two clutch seats are connected by an adjusting rod. A threaded hole is constructed on each of the connecting ears. Two external threads with opposite directions are symmetrically constructed on the adjusting rod. Each external thread is threadedly connected to the corresponding threaded hole.

[0009] Furthermore, a locking seat is constructed at the lower part of each of the clutch seats, and a locking groove is provided at one end of the locking seat near the diagonal brace. The locking groove extends along the length direction of the slide rail body to both sides of the locking seat. The slide rail body has a slide groove extending along its length direction, and a fixed protrusion extending along its length direction is provided in the middle of the slide groove. Locking bars are respectively constructed on both sides of the fixed protrusion. Each locking bar extends along the length direction of the fixed protrusion, and when the limiting gear and the limiting internal gear ring are coaxially assembled, the locking bar is tightly engaged with the corresponding locking groove.

[0010] Furthermore, two steel strand groups are fixed on the upper slide rail and on the outside of the two inclined support frames. Each steel strand group includes multiple steel strands arranged side by side. One end of each steel strand passes through the corresponding inclined support frame and extends out of the hydraulic tensioning mechanism. The steel strand contacts the corresponding second connecting rod and first connecting rod, and tensions the inclined support frame by tensioning the second connecting rod and the first connecting rod. The hydraulic tensioning mechanism is located between the two inclined support frames and below the upper slide rail.

[0011] Furthermore, two rows of telescopic members are connected to the hydraulic tensioning mechanism, and the upper and lower ends of each telescopic member constituting each row of telescopic members are respectively connected to the upper slide rail and the hydraulic tensioning mechanism.

[0012] Furthermore, multiple hinge rods are provided on the hydraulic tensioning mechanism. The lower end of each hinge rod is hinged to a shaft fixed on the hydraulic tensioning mechanism, and the upper end of the hinge rod is connected to the upper slide rail through a connecting seat. These hinge rods are divided into two groups, and the upper ends of these two groups of hinge rods are respectively close to the upper ends of the two inclined support frames.

[0013] Furthermore, the hydraulic tensioning mechanism includes a first drive component group and a second drive component group symmetrically installed at both ends of the assembly. The first drive component group includes multiple first drive components arranged side by side, and the second drive component group includes multiple second drive components arranged side by side. The first drive components and the second drive components are arranged in a one-to-one correspondence. A first front-mounted hydraulic chuck and a second front-mounted hydraulic chuck are respectively installed at the ends of the first drive components and the second drive components that are far apart from each other. Multiple wire passages are opened on the assembly. The steel strand located on the side of the first front-mounted hydraulic chuck passes through the first front-mounted hydraulic chuck, the wire passage and the second front-mounted hydraulic chuck in sequence. The steel strand located on the side of the second front-mounted hydraulic chuck passes through the second front-mounted hydraulic chuck, the wire passage and the first front-mounted hydraulic chuck in sequence.

[0014] Furthermore, multiple assembly cavities are arranged side-by-side within the assembly body, each assembly cavity being divided into a first driving cavity and a second driving cavity by a partition plate; the first driving component includes a first transmission sleeve with one end extending into the first driving cavity, and a first piston is constructed at the end of the first transmission sleeve extending into the first driving cavity, the first piston dividing the first driving cavity into a first hydraulic chamber A and a first hydraulic chamber B, and the other end of the first transmission sleeve is connected to a corresponding first front-mounted hydraulic chuck; the second driving component includes a second transmission sleeve with one end extending into the second driving cavity, and a second piston is constructed at the end of the second transmission sleeve extending into the second driving cavity, the second piston dividing the second driving cavity into a second hydraulic chamber A and a second hydraulic chamber B, and the other end of the second transmission sleeve is connected to a corresponding second front-mounted hydraulic chuck; and the first hydraulic chamber A, the first hydraulic chamber B, the second hydraulic chamber A, the second hydraulic chamber B, the first front-mounted hydraulic chuck, and the second front-mounted hydraulic chuck are all connected to the hydraulic system.

[0015] The present invention, by employing the aforementioned structure, achieves the following technological advancements compared to existing technologies: Before constructing the cast-in-place beam above the subway, excavations are first made on both sides of the ground surface above the subway, and concrete foundations are constructed. Then, lower sliding rails are installed on these two concrete foundations, and two inclined support frames are installed on the two lower sliding rails. The upper ends of these two inclined support frames are connected to the upper sliding rail. Thus, the lower sliding rail, upper sliding rail, and two inclined support frames form an isosceles trapezoidal structure, thereby avoiding obstruction of the ground surface above the subway. During the construction of the cast-in-place beam, wooden blocks are spaced above the upper sliding rail, and then top supports are installed on the wooden blocks. Whether in subsequent rebar tying or pouring operations, the upper sliding rail... The weight borne will be transferred to the concrete foundation through two inclined support frames, and then from the concrete foundation to the ground, thus effectively avoiding the soil foundation above the subway and preventing the soil foundation above the subway from bearing external forces. This ensures the structural strength of the soil foundation above the subway and avoids situations such as soil foundation floating or collapse. Moreover, this invention can use a clutch mechanism to release the locking state of the inclined support frames with the upper and lower slide rails, thereby achieving the purpose of adjusting the distance between the two inclined support frames and adjusting the tilt angle of each inclined support frame. This makes the overall structure stable and has a high support capacity. After the adjustment is completed, the clutch mechanism is controlled to lock the inclined support frames with the upper and lower slide rails to prevent safety accidents. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] In the attached diagram:

[0018] Figure 1 is a schematic diagram of the structure of an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the structure of the diagonal brace in an embodiment of the present invention, which is connected to the lower slide rail and the upper slide rail by two clutches.

[0020] Figure 3 is a schematic diagram of the connection between the lower end of the diagonal brace and the clutch in an embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of the structure in which the lower end of the diagonal brace of the present invention is connected to two limiting gears via a connecting shaft;

[0022] Figure 5 is a schematic diagram of the clutch seat with a locking seat according to an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of the adjusting rod according to an embodiment of the present invention;

[0024] Figure 7 is a partial structural schematic diagram of the lower slide rail or the upper slide rail according to an embodiment of the present invention;

[0025] Figure 8 is a side view of the structure of the present invention, which connects two steel strand groups through a hydraulic tensioning mechanism;

[0026] Figure 9 is a structural schematic diagram of the hydraulic tensioning mechanism according to an embodiment of the present invention;

[0027] Figure 10 is a partial structural cross-sectional view of the hydraulic tensioning mechanism according to an embodiment of the present invention;

[0028] Figure 11 is a structural schematic diagram of the hydraulic tensioning mechanism of an embodiment of the present invention from another perspective;

[0029] Figure 12 is a side view of the structure of the hydraulic tensioning mechanism of the present invention, which is connected to the upper slide rail by two rows of telescopic members;

[0030] Figure 13 is a schematic diagram of the hydraulic tensioning mechanism of the present invention, which is connected to the upper slide rail by multiple hinged rods.

[0031] Figure 14 is a side view of the structure of the hydraulic tensioning mechanism of the present invention, which is connected to the upper slide rail by multiple hinged rods;

[0032] Figure 15 is a schematic diagram of the connection between the diagonal brace, the bent rod, the first connecting rod, the second connecting rod, and the two clutches in an embodiment of the present invention;

[0033] Figure 16 is a schematic diagram of the connection between the clutch mechanism and the drive mechanism in an embodiment of the present invention;

[0034] Figure 17 is an enlarged view of the structure of part A in Figure 16.

[0035] Components labeled: 100- Inclined support frame, 101- Inclined brace, 102- Bending rod, 103- Inclined rod, 104- First connecting rod, 105- Second connecting rod, 106- Connecting shaft, 107- Restricting gear, 200- Lower slide rail, 201- Slide rail body, 202- Slide groove, 203- Fixing protrusion, 204- Locking strip, 300- Upper slide rail, 400- Concrete foundation, 500- Subway surface above, 600- Wooden pad, 700- Clutch, 701- Clutch seat, 702- Connecting hole, 703- Restricting internal gear ring, 704- Connecting ear, 70 5-Threaded hole, 706-Locking seat, 707-Locking groove, 708-Adjusting rod, 709-External thread, 710-Locking nut, 800-Hydraulic tensioning mechanism, 801-Assembly, 802-First transmission sleeve, 803-Second transmission sleeve, 804-First piston, 805-Second piston, 806-First hydraulic chamber A, 807-Second hydraulic chamber A, 808-First hydraulic chamber B, 809-Second hydraulic chamber B, 810-Separator plate, 811-Wire passage, 812-First hydraulic passage A, 813-First conductive passage A, 814-Second hydraulic passage A Channel A, 815 - Second guiding channel A, 816 - First hydraulic channel B, 817 - First guiding channel B, 818 - Second hydraulic channel B, 819 - Second guiding channel B, 820 - First front-mounted hydraulic chuck, 821 - Second front-mounted hydraulic chuck, 822 - First hydraulic pipe A, 823 - First bend A, 824 - First control valve A, 825 - First control valve a, 826 - First hydraulic pipe B, 827 - First bend B, 828 - First control valve B, 829 - First control valve b, 830 - First branch pipe A, 831 - First branch pipe B. 832-Second hydraulic pipe A, 833-Second bend A, 834-Second control valve A, 835-Second control valve a, 836-Second hydraulic pipe B, 837-Second bend B, 838-Second control valve B, 839-Second control valve b, 840-Second branch pipe A, 841-Second branch pipe B, 900-Steel strand, 1000-Telescopic component, 1100-Hinge rod, 1101-Assembly ear, 1102-Shaft, 1103-Connecting seat, 1200-Drive mechanism, 1201-Hydraulic motor, 1202-Drive gear, 1203-Driven gear. Detailed Implementation

[0036] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0037] This invention discloses a low-height support device for the construction of cast-in-place beams above subway stations, as shown in Figures 1-17. It includes an upper slide rail 300, two concrete foundations 400, two lower slide rails 200, and two inclined support frames 100. The two concrete foundations 400 are constructed on both sides of the ground surface 500 above the subway station. The two lower slide rails 200 are respectively installed on the two concrete foundations 400. The two inclined support frames 100 are respectively connected to the two lower slide rails 200, with their upper ends close to each other. The upper end of each inclined support frame 100 is connected to the upper slide rail 300. The upper slide rail 300 is positioned above and parallel to the two lower slide rails 200, and the upper slide rail 300 and lower slide rails 200 have the same guiding direction. Each inclined support frame 100 has a clutch mechanism connected to both its upper and lower ends, and these two clutch mechanisms are respectively connected to the upper slide rail 300 and the lower slide rail 200. The span between the bottom ends of the two inclined support frames 100 in this invention is not less than 30m, and the overall support device supports a weight of 400-500t. The working principle and advantages of this invention are as follows: Before constructing the cast-in-place beam above the subway, excavations are first made on both sides of the ground surface 500 above the subway, and concrete foundations 400 are constructed. Then, lower rails 200 are installed on these two concrete foundations 400, and the two inclined support frames 100 are installed on the two lower rails 200. The upper ends of these two inclined support frames 100 are connected to the upper rail 300. Thus, the lower rail 200, the upper rail 300, and the two inclined support frames 100 form an isosceles trapezoidal structure, thereby avoiding the ground surface 500 above the subway. During the construction of the cast-in-place beam, wooden blocks 600 are spaced above the upper rail 300, and then top supports are installed on the wooden blocks 600. Whether in subsequent rebar binding or pouring operations, the upper rail 300 bears the weight... The gravity is transferred to the concrete foundation 400 through the two inclined support frames 100, and then to the ground through the concrete foundation 400. This effectively avoids the soil foundation above the subway, preventing it from bearing external forces and ensuring the structural strength of the soil foundation above the subway, thus preventing soil foundation uplift or collapse. Moreover, the invention can use a clutch mechanism to release the locking state between the inclined support frame 100 and the upper slide rail 300 and the lower slide rail 200, thereby adjusting the distance between the two inclined support frames 100 and the tilt angle of each inclined support frame 100. This makes the overall structure stable and provides high support capacity. After adjustment, the clutch mechanism is controlled to lock the inclined support frame 100 to the upper slide rail 300 and the lower slide rail 200 to prevent safety accidents.

[0038] As a preferred embodiment of the present invention, as shown in Figures 1, 2, and 15, the inclined support frame 100 includes multiple inclined struts 101 arranged side by side. Adjacent inclined struts 101 are interconnected by multiple first connecting rods 104. These first connecting rods 104 are spaced apart along the inclined direction of the inclined struts 101, and each first connecting rod 104 is connected to two inclined struts 101 at both ends. In this embodiment, a bent rod 102 is constructed on each inclined strut 101 on the side away from the other inclined support frame 100. The two ends of the bent rod 102 are connected to the inclined struts 101, and the middle part of the bent rod 102 is connected to the inclined struts 101 through an inclined rod 103. Adjacent bent rods 102 are interconnected by multiple second connecting rods 105. These second connecting rods 105 are spaced apart along the extension direction of the bent rods 102, and each second connecting rod 105 is connected to two bent rods 102 at both ends. To facilitate disassembly, assembly, and transportation, both the first connecting rod 104 and the second connecting rod 105 in this embodiment are of a discontinuous structure. Specifically, the first connecting rod 104 is divided into two parts: one part is connected to a diagonal brace 101, and the other part is connected to another diagonal brace 101. The ends of these two parts, close to each other, extend into both ends of the sleeve and are threadedly connected to the sleeve. Similarly, the second connecting rod 105 is divided into two parts: one part is connected to a bent rod 102, and the other part is connected to another bent rod 102. The ends of these two parts, close to each other, extend into both ends of the sleeve and are threadedly connected to the sleeve. This embodiment utilizes a bent rod 102, which offers several advantages. Firstly, when the diagonal brace 101 is subjected to external force, a portion of the force is transmitted to the bent rod 102 through its two ends and the diagonal rod 103. This multi-point force distribution on the bent rod 102 disperses and gradually cancels out the external force, preventing deformation caused by localized stress on the diagonal brace 101 and the bent rod 102. Secondly, the use of a first connecting rod 104 and a second connecting rod 105 to connect the diagonal brace 101 and the bent rod 102 creates a unified structure, enhancing the integrity, stability, and strength of the inclined support frame 100, enabling it to withstand significant external forces. The first connecting rod 104 and the second connecting rod 105 also facilitate climbing by construction personnel, making it convenient for disassembly, assembly, and maintenance of the support device.

[0039] As a preferred embodiment of the present invention, as shown in Figures 2-6, the clutch mechanism includes multiple clutch components 700 arranged side by side, wherein each clutch component 700 is disposed at the upper or lower end of a corresponding diagonal brace 101. In this embodiment, the upper slide rail 300 and the lower slide rail 200 have the same cross-sectional structure, both including multiple slide rail bodies 201 connected side by side. Each clutch component 700 is assembled between the slide rail body 201 and the corresponding end of the diagonal brace 101. Specifically, the clutch component 700 in this embodiment includes two clutch seats 701, which are disposed opposite to each other on both sides of the diagonal brace 101, and are slidably connected to the slide rail body 201. In this embodiment, a connecting shaft 106 is fixedly connected to the end of the diagonal brace 101. Restricting gears 107 are fixedly mounted on both sides of the connecting shaft 106. A restricting internal gear ring 703 and a connecting hole 702 are constructed on the clutch seat 701. The axes of the restricting internal gear ring 703 and the connecting hole 702 coincide. When the restricting gear 107 and the restricting internal gear ring 703 are coaxially assembled, the end of the connecting shaft 106 extends out of the corresponding connecting hole 702. In this embodiment, connecting ears 704 are respectively constructed on both sides of the clutch seat 701. The corresponding connecting ears 704 of the two clutch seats 701 are connected by an adjusting rod 708. A threaded hole 705 is constructed on each connecting ear 704. Two external threads 709 with opposite directions of rotation are symmetrically constructed on the adjusting rod 708. Each external thread 709 is threadedly connected to the corresponding threaded hole 705. Locking nuts 710 are threadedly connected to the ends of the adjusting rod 708 located at the ends of the two external threads 709 that are far apart from each other. When the clutch 700 locks the end of the diagonal brace 101, the locking nuts 710 are tightened. The working principle of this embodiment is as follows: When it is necessary to lock the upper end of the diagonal brace 101 to the upper slide rail 300, or the lower end of the diagonal brace 101 to the lower slide rail 200, rotate the two adjusting rods 708 synchronously in the forward direction, so that the two clutch seats 701 move towards each other until the limiting internal gear ring 703 on the clutch seat 701 is fully assembled with the corresponding limiting gear 107, and then tighten the locking nut 710. When it is necessary to release the locking of the diagonal brace 101, so that the angle of the diagonal brace 101 and its position on the lower slide rail 200 are adjustable, loosen the locking nut 710, and rotate the two adjusting rods 708 synchronously in the reverse direction, so that the two clutch seats 701 move away from each other until the limiting internal gear ring 703 on the clutch seat 701 is completely disengaged from the corresponding limiting gear 107. At this time, the adjustment of the diagonal brace 101 can be performed. After the adjustment is completed, the clutch component 700 needs to be operated again to lock the diagonal brace 101. In this embodiment, in order to facilitate the adjustment of the angle and position of the diagonal brace 101 after the clutch 700 is unlocked, the clutch seat 701 is slidably connected to the slide rail body 201.Thus, to prevent the locked diagonal brace 101 and clutch seat 701 from sliding on the slide rail body 201, the following measures are taken, as shown in Figures 5 and 7: a locking seat 706 is constructed at the lower part of each clutch seat 701, and a locking groove 707 is provided at one end of the locking seat 706 near the diagonal brace 101. The locking groove 707 extends along the length of the slide rail body 201 to both sides of the locking seat 706. In this embodiment, the slide rail body 201 has a slide groove 202 extending along its length direction. A fixed protrusion 203 extending along its length direction is provided in the middle of the slide groove 202. Locking strips 204 are respectively constructed on both sides of the fixed protrusion 203. Each locking strip 204 extends along the length direction of the fixed protrusion 203. When the limiting gear 107 and the limiting internal gear ring 703 are coaxially assembled, the locking strip 204 is tightly engaged with the corresponding locking groove 707, thereby locking the locking seat 706 and the fixed protrusion 203 and preventing relative sliding between the clutch seat 701 and the slide rail body 201.

[0040] As a preferred embodiment of the present invention, in order to improve the overall stability and compressive strength of the support device, the following measures are taken, as shown in Figures 8 and 12-14: two steel strand groups are fixed on the upper slide rail 300 and located outside the two inclined support frames 100. Each steel strand group includes multiple steel strands 900 arranged side by side. One end of each steel strand 900 passes through the corresponding inclined support frame 100 and extends out of the hydraulic tensioning mechanism 800. Moreover, the steel strand 900 contacts the corresponding second connecting rod 105 and first connecting rod 104, and tensions the inclined support frame 100 by tensioning the second connecting rod 105 and the first connecting rod 104. The hydraulic tensioning mechanism 800 is located between the two inclined support frames 100 and below the upper slide rail 300. The working principle and advantages of this embodiment are as follows: This embodiment uses a hydraulic tensioning mechanism 800 to tension two groups of steel strands, ensuring that the tension of each steel strand 900 on the upper slide rail 300 and the inclined support frame 100 reaches a predetermined range. This ensures that the two inclined support frames 100 have strong compressive strength. Furthermore, the two groups of steel strands pull down on both ends of the upper slide rail 300, causing the middle of the upper slide rail 300 to arch upwards. This effectively counteracts the weight of the cast-in-place beam, preventing the beam at that location from sagging. Moreover, to ensure that the steel strand 900 exerts a strong tension on the inclined support rod 101, the steel strand 900 can be wound once around the first connecting rod 104 before being connected to the hydraulic tensioning mechanism 800. When the pretension of the steel strand 900 is below the predetermined range, the hydraulic tensioning mechanism 800 is activated to pull the steel strand 900 until the pretension reaches the predetermined range, after which the hydraulic tensioning mechanism 800 locks the steel strand 900. When the pretension of the steel strand 900 exceeds the predetermined range, the hydraulic tensioning mechanism 800 is activated to slowly release the steel strand 900 until the pretension reaches the predetermined range, after which the hydraulic tensioning mechanism 800 locks the steel strand 900. In summary, this embodiment allows for tightening or loosening of the steel strand 900 according to specific circumstances, maintaining the overall structural stability and compressive strength of the support device at its optimal state, thereby improving construction quality and effectively preventing the support device from affecting the ground surface 500 above the subway, ensuring that the subway structure is not damaged.

[0041] In a preferred embodiment of the present invention, to improve the integrity of the hydraulic tensioning mechanism 800 and the support device, and to adjust the pulling or releasing angle of the steel strand 900 as needed, the following measures are taken, as shown in Figure 12: two rows of telescopic members 1000 are connected to the hydraulic tensioning mechanism 800. The upper and lower ends of each telescopic member 1000 constituting each row of telescopic members 1000 are respectively connected to the upper slide rail 300 and the hydraulic tensioning mechanism 800. Generally, the telescopic members 1000 are hydraulic cylinders. By synchronously controlling the action of the hydraulic cylinders, the hydraulic cylinders drive the hydraulic tensioning mechanism 800 to move a certain distance in the vertical direction, thereby adjusting the pulling angle of the hydraulic tensioning mechanism 800 on the steel strand 900. This embodiment can also achieve the above function using another method. Specifically, as shown in Figures 13 and 14, multiple hinge rods 1100 are provided on the hydraulic tensioning mechanism 800. The lower end of each hinge rod 1100 is hinged to the shaft 1102. The shaft 1102 is fixedly connected to the hydraulic tensioning mechanism 800 through the mounting lug 1101 installed on the hydraulic tensioning mechanism 800. The upper end of the hinge rod 1100 is connected to the upper slide rail 300 through the connecting seat 1103. The structure of the connecting seat 1103 is the same as that of the clutch 700 mentioned above, and will not be described in detail here. Moreover, the multiple hinge rods 1100 described in this embodiment are divided into two groups. The upper ends of these two groups of hinge rods 1100 are respectively close to the upper ends of the two inclined support frames 100, and the side view shows a V-shaped shape. In this embodiment, by adjusting the opening of the two sets of hinge rods 1100, the hydraulic tensioning mechanism 800 is displaced a certain distance in the vertical direction, thereby adjusting the pulling angle of the hydraulic tensioning mechanism 800 on the steel strand 900.

[0042] In a preferred embodiment of the present invention, to facilitate the locking and unlocking of the clutch 700 on the diagonal brace 101 or the hinge rod 1100, the following measures are taken, as shown in Figures 16 and 17: the adjusting rods 708 on adjacent clutches 700 are sequentially connected to form a complete rod-shaped structure, and the rod-shaped structure is driven to rotate by the drive mechanism 1200. The drive mechanism 1200 includes a hydraulic motor 1201, on the output shaft of which a drive gear 1202 is mounted. Driven gears 1203 are respectively mounted at the ends of the two adjusting rods 708 on the clutches 700 at the ends. The drive gear 1202 is located between the two driven gears 1203, and the drive gear 1202 meshes with the two driven gears 1203. The working principle and advantages of this embodiment are as follows: When it is necessary to adjust the angle of the inclined support frame 100 or its position on the upper slide rail 300 and lower slide rail 200, or to adjust the position of the upper end of the hinge rod 1100 on the upper slide rail 300, the hydraulic motor 1201 is controlled to move, so that it drives the two driven gears 1203 to move synchronously through the active gear 1202. This makes the two complete rod-shaped structures rotate synchronously, thereby making the clutch seats 701 on each clutch component 700 move away from each other, and the limiting internal gear ring 703 on the clutch seat 701 disengages from the limiting gear 107 on the inclined support rod 101 or the hinge rod 1100. In this way, the angle and position of the inclined support rod 101 or the hinge rod 1100 can be adjusted. After the adjustment is completed, the hydraulic motor 1201 is controlled to drive the two rod-shaped structures to rotate in opposite directions, so that the two clutch seats 701 on each clutch component 700 mesh with the corresponding limiting gear 107.

[0043] As a preferred embodiment of the present invention, as shown in Figures 9-11, the hydraulic tensioning mechanism 800 includes an assembly 801, a first drive component group, and a second drive component group. The first and second drive component groups are symmetrically installed at both ends of the assembly 801. The first drive component group includes multiple first drive components arranged side-by-side, and the second drive component group includes multiple second drive components arranged side-by-side, with each first and second drive component corresponding to the others. In this embodiment, a first front-mounted hydraulic chuck 820 and a second front-mounted hydraulic chuck 821 are respectively installed at the ends of the first and second drive components that are far apart from each other. Multiple wire-passing channels 811 are provided on the assembly 801. The steel strand 900 located on the side of the first front-mounted hydraulic chuck 820 passes sequentially through the first front-mounted hydraulic chuck 820, the wire passage 811, and the second front-mounted hydraulic chuck 821. The steel strand 900 located on the side of the second front-mounted hydraulic chuck 821 passes sequentially through the second front-mounted hydraulic chuck 821, the wire passage 811, and the first front-mounted hydraulic chuck 820. Multiple assembly cavities are arranged side-by-side within the assembly body 801, and each assembly cavity is divided into a symmetrical first driving cavity and a second driving cavity by a partition plate 810. The first driving component in this embodiment includes a first transmission sleeve 802, one end of which extends into the first driving cavity. A first piston 804 is constructed at the end of the first transmission sleeve 802 that extends into the first driving cavity. The first piston 804 divides the first driving cavity into a first hydraulic chamber A806 and a first hydraulic chamber B808. The other end of the first transmission sleeve 802 is connected to the corresponding first front-mounted hydraulic chuck 820. The second driving component in this embodiment includes a second transmission sleeve 803, one end of which extends into the second driving cavity. A second piston 805 is constructed at the end of the second transmission sleeve 803 that extends into the second driving cavity. The second piston 805 divides the second driving cavity into a second hydraulic chamber A807 and a second hydraulic chamber B809. The other end of the second transmission sleeve 803 is connected to a corresponding second front-mounted hydraulic chuck 821. In this embodiment, each of the first hydraulic chambers A806, B808, A807, B809, first front-mounted hydraulic chucks 820, and second front-mounted hydraulic chucks 821 are all connected to the hydraulic system.Specifically, the hydraulic system includes a first hydraulic channel A812 and a second hydraulic channel A814 symmetrically constructed within the assembly 801. The first hydraulic channel A812 is connected to the first hydraulic chamber A806 through multiple first conductive channels A813, and the second hydraulic channel A814 is connected to the second hydraulic chamber A807 through multiple second conductive channels A815. A first hydraulic channel B816 and a second hydraulic channel B818 are symmetrically constructed on both sides of the upper end of the assembly 801. The first hydraulic channel B816 is connected to the first hydraulic chamber B808 through multiple first conductive channels B817, and the second hydraulic channel B818 is connected to the second hydraulic chamber B809 through multiple second conductive channels B819. In this embodiment, a first bend A823 is connected to one end of the first hydraulic channel A812. The first bend A823 is connected to a first hydraulic pipe A822 located at one end face of the assembly 801. A first bend B827 is connected to one end of the first hydraulic channel B816. The first bend B827 is connected to a first hydraulic pipe B826 located at one end face of the assembly 801. Each first front-mounted hydraulic chuck 820 is connected to a first branch pipe A830 and a first branch pipe B831. The first branch pipe A830 is connected to the first hydraulic pipe A822, and the first branch pipe B831 is connected to the first hydraulic pipe B826. A first control valve A824 is installed on the first hydraulic pipe A822, a first control valve B828 is installed on the first hydraulic pipe B826, a first control valve a825 is installed on the first bend A823, and a first control valve b829 is installed on the first bend B827. In this embodiment, a second bend A833 is connected to one end of the second hydraulic channel A814. The second bend A833 is connected to the second hydraulic pipe A832 located at one end face of the assembly 801. A second bend B837 is connected to one end of the second hydraulic channel B818. The second bend B837 is connected to the second hydraulic pipe B836 located at one end face of the assembly 801. A second branch pipe A840 and a second branch pipe B841 are connected to each second front-mounted hydraulic chuck 821. The second branch pipe A840 is connected to the second hydraulic pipe A832, and the second branch pipe B841 is connected to the second hydraulic pipe B836. A second control valve A834 is installed on the second hydraulic pipe A832, a second control valve B838 is installed on the second hydraulic pipe B836, a second control valve a835 is installed on the second bend A833, and a second control valve b839 is installed on the second bend B837. Furthermore, in this embodiment, the first branch pipe A830, the first branch pipe B831, the second branch pipe A840, and the second branch pipe B841 are all hydraulic hoses, so that the first front-mounted hydraulic chuck 820 and the second front-mounted hydraulic chuck 821 can extend and retract with the first driving member and the second driving member, respectively.The working principle and advantages of this embodiment are as follows: When it is necessary to increase the preload of the steel strand 900, which is inserted through the second front-mounted hydraulic chuck 821 and exited through the first front-mounted hydraulic chuck 820, the opening and closing of the corresponding valves on the hydraulic system are controlled, so that hydraulic oil enters each of the first hydraulic chambers A806, and the hydraulic oil in the first hydraulic chamber B808 is gradually discharged. At the same time, the hydraulic oil drives the first front-mounted hydraulic chuck 820 to clamp the steel strand 900. At this time, the second front-mounted hydraulic chuck 821 is not clamping the steel strand 900. With the first drive unit in a tight state and the second drive unit remaining stationary, the first drive unit drives the first front-mounted hydraulic chuck 820 to gradually extend outward, causing the preload of the steel strand 900 to gradually increase. When the preload increases to a predetermined range, the second drive unit is controlled to clamp the steel strand 900, and the first drive unit releases its grip on the steel strand 900. Hydraulic oil then enters the first hydraulic chamber B808, and the hydraulic oil in the first hydraulic chamber A806 gradually discharges. The first drive unit gradually returns to its original position, and after returning to its original position, it is controlled to clamp the steel strand 900 again. If the first drive unit cannot meet the required preload of the steel strand 900 in one operation, the above actions can be repeated multiple times until the predetermined range is reached. When the preload of the steel strand 900 is too high, the hydraulic system drives the second front-mounted hydraulic chuck 821 to clamp the steel strand 900, while the first front-mounted hydraulic chuck 820 releases its grip on the steel strand 900. Then, the second drive mechanism is activated, gradually releasing the steel strand 900. When the preload of the steel strand 900 reaches the predetermined range, the first front-mounted hydraulic chuck 820 is controlled to clamp the steel strand 900, and the second front-mounted hydraulic chuck 821 releases its grip. The second drive mechanism then gradually returns to its original position. If the second drive mechanism cannot meet the required preload of the steel strand 900 in one operation, the above actions can be repeated multiple times until the predetermined range is reached. In this embodiment, when it is necessary to increase the preload of the steel strand 900 that is inserted through the first front-mounted hydraulic chuck 820 and exited through the second front-mounted hydraulic chuck 821, the operation steps are similar to those described above, except that the actions of the first driving member, the second driving member, the first front-mounted hydraulic chuck 820, and the second front-mounted hydraulic chuck 821 are reversed, which will not be elaborated here.

[0044] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A low-height support device for the construction of cast-in-place beams above subway lines, characterized in that: The system includes two concrete foundations constructed on either side of the subway surface. Lower slide rails are installed on each of the two foundations, and inclined support frames are connected to each slide rail. The upper ends of the inclined support frames on the two slide rails are close to each other. The upper end of each inclined support frame is connected to an upper slide rail, which is positioned above and parallel to the two slide rails, and the upper and lower slide rails have the same guiding direction. Clutch mechanisms are connected to the upper and lower ends of each inclined support frame, and the two clutch mechanisms are respectively connected to the upper and lower slide rails. Each inclined support frame includes multiple diagonal braces arranged side-by-side, and adjacent diagonal braces are interconnected via multiple first connecting rods. These first connecting rods are spaced apart along the inclination direction of the diagonal braces, and both ends of each first connecting rod are connected to two diagonal braces. A bent rod is constructed on each diagonal brace on the side away from the other diagonal support frame. Both ends of the bent rod are connected to the diagonal brace, and the middle of the bent rod is connected to the diagonal brace via an inclination rod. Adjacent bent rods are interconnected by multiple second connecting rods, which are spaced apart along the extension direction of the bent rods, and both ends of each second connecting rod are connected to two bent rods. The clutch mechanism includes clutch components respectively disposed at the upper or lower end of each diagonal brace. Both the upper and lower slide rails include multiple slide rail bodies connected side-by-side. Each clutch component is assembled between the corresponding ends of the slide rail body and the diagonal brace; each clutch component includes a clutch seat disposed opposite to both sides of the diagonal brace and slidably connected to the slide rail body; a connecting shaft is fixedly connected to the end of the diagonal brace; a limiting gear is fixedly assembled on both sides of the connecting shaft; a limiting internal gear ring and a connecting hole with the same axis are constructed on the clutch seat; when the limiting gear and the limiting internal gear ring are coaxially assembled, the end of the connecting shaft extends out of the corresponding connecting hole; a connecting lug is constructed on both sides of the clutch seat; the corresponding connecting lugs of the two clutch seats are connected by an adjusting rod; a threaded hole is constructed on each connecting lug; and a threaded hole is constructed on the adjusting rod. The slide rail has two external threads with opposite directions of rotation, each threaded part being threadedly connected to a corresponding threaded hole. A locking seat is constructed at the lower part of each clutch seat, and a locking groove is provided at one end of the locking seat near the diagonal brace. The locking groove extends along the length of the slide rail body to both sides of the locking seat. The slide rail body has a groove extending along its length, and a fixed protrusion extending along its length is provided in the middle of the groove. Locking bars are constructed on both sides of the fixed protrusion, each locking bar extending along the length of the fixed protrusion. When the limiting gear and the limiting internal gear ring are coaxially assembled, the locking bars are tightly engaged with the corresponding locking grooves.

2. The low-height support device for the construction of cast-in-place beams above subways according to claim 1, characterized in that: Two steel strand groups are fixed on the upper slide rail and on the outside of the two inclined support frames. Each steel strand group includes multiple steel strands arranged side by side. One end of each steel strand passes through the corresponding inclined support frame and extends out of the hydraulic tensioning mechanism. The steel strand contacts the corresponding second connecting rod and first connecting rod, and tensions the inclined support frame by tensioning the second connecting rod and the first connecting rod. The hydraulic tensioning mechanism is located between the two inclined support frames and below the upper slide rail.

3. A low-height support device for the construction of cast-in-place beams above a subway station, as described in claim 2, is characterized in that: Two rows of telescopic members are connected to the hydraulic tensioning mechanism, and the upper and lower ends of each telescopic member constituting the row of telescopic members are respectively connected to the upper slide rail and the hydraulic tensioning mechanism.

4. A low-height support device for the construction of cast-in-place beams above a subway station, as described in claim 2, is characterized in that: Multiple hinge rods are provided on the hydraulic tensioning mechanism. The lower end of each hinge rod is hinged to a shaft fixed on the hydraulic tensioning mechanism, and the upper end of the hinge rod is connected to the upper slide rail through a connecting seat. These hinge rods are divided into two groups, and the upper ends of the two groups of hinge rods are respectively close to the upper ends of the two inclined support frames.

5. A low-height support device for the construction of cast-in-place beams above a subway station, as described in claim 2, is characterized in that: The hydraulic tensioning mechanism includes a first drive component group and a second drive component group symmetrically installed at both ends of the assembly. The first drive component group includes multiple first drive components arranged side by side, and the second drive component group includes multiple second drive components arranged side by side. The first drive components and the second drive components are arranged in a one-to-one correspondence. A first front-mounted hydraulic chuck and a second front-mounted hydraulic chuck are respectively installed at the ends of the first drive components and the second drive components that are far apart from each other. Multiple wire passages are opened on the assembly. The steel strand located on the side of the first front-mounted hydraulic chuck passes through the first front-mounted hydraulic chuck, the wire passage and the second front-mounted hydraulic chuck in sequence. The steel strand located on the side of the second front-mounted hydraulic chuck passes through the second front-mounted hydraulic chuck, the wire passage and the first front-mounted hydraulic chuck in sequence.

6. A low-height support device for the construction of cast-in-place beams above a subway station, as described in claim 5, is characterized in that: The assembly body contains a plurality of assembly cavities arranged side by side, each assembly cavity being divided into a first driving cavity and a second driving cavity by a partition plate; the first driving component includes a first transmission sleeve with one end extending into the first driving cavity, and a first piston is constructed at the end of the first transmission sleeve extending into the first driving cavity, the first piston dividing the first driving cavity into a first hydraulic chamber A and a first hydraulic chamber B, and the other end of the first transmission sleeve is connected to a corresponding first front-mounted hydraulic chuck; the second driving component includes a second transmission sleeve with one end extending into the second driving cavity, and a second piston is constructed at the end of the second transmission sleeve extending into the second driving cavity, the second piston dividing the second driving cavity into a second hydraulic chamber A and a second hydraulic chamber B, and the other end of the second transmission sleeve is connected to a corresponding second front-mounted hydraulic chuck; and the first hydraulic chamber A, the first hydraulic chamber B, the second hydraulic chamber A, the second hydraulic chamber B, the first front-mounted hydraulic chuck, and the second front-mounted hydraulic chuck are all connected to the hydraulic system.

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