A vertical sliding formwork device for concrete pouring at the corner of a subway foundation pit end well

Abstract

The utility model relates to a subway foundation pit end well external corner concrete pouring vertical sliding formwork device belongs to subway station foundation pit enclosure construction technical field, the utility model discloses through setting up the link formwork of L shape bending structure and collocating support structure, ball screw etc. form the movable structure that is used in the construction of foundation pit external corner specially, wherein the shape of link formwork can adapt to the external corner shape of end well, ensure that concrete once forms, reduce the risk of joint and leakage, utilize integral arc formwork, corner section once forms, eliminates the construction joint, effectively avoids the problem of seepage water, the flatness of forming surface is high, realizes the layered continuous pouring of external corner concrete, eliminates external corner construction joint, solves the seepage water problem of subway enclosure corner construction joint. Vertical sliding lifting formwork does not need to hoist repeatedly, eliminates the risk of high-altitude hoisting.

Description

Technical Field

[0001] This utility model relates to a vertical sliding formwork device for concrete pouring at the external corner of the end well of a subway foundation pit, belonging to the technical field of subway station foundation pit retaining structure construction. Background Technology

[0002] At the external corner of the foundation pit, the support of the construction formwork and the pouring of concrete face many technical challenges.

[0003] Traditional construction formwork is mostly assembled in straight sections, requiring multiple formwork erections and dismantlings. This results in numerous joints, a high risk of concrete slurry leakage, and a tendency for honeycomb on the concrete surface, leading to high repair costs later on. Formwork lifting relies on multiple hoisting operations by tower cranes, which takes a long time to position. Working at heights can easily cause formwork collisions and deformations, posing a high safety risk. Furthermore, lateral earth pressure is concentrated at the external corners, and traditional formwork support systems have poor stability and are difficult to adapt to dynamic stress changes during the excavation process.

[0004] Therefore, it is particularly important to develop a sliding template device that can be vertically raised and lowered and has strong stability. Utility Model Content

[0005] To address the aforementioned problems, this invention proposes a vertical sliding formwork device for concrete pouring at the external corner of a subway foundation pit. Utilizing an integral arc-shaped formwork, the corner section is formed in one step, eliminating construction joints and effectively preventing water leakage. The formed surface exhibits high flatness. It enables layered continuous pouring of corner concrete, eliminating construction joints at the corner and resolving the water leakage problem at the corner construction joints of the subway retaining structure. The vertical sliding lifting formwork eliminates the need for repeated hoisting, thus eliminating the risks associated with high-altitude hoisting.

[0006] This utility model provides a vertical sliding formwork device for concrete pouring at the external corner of a subway foundation pit end well, comprising:

[0007] The support structure includes a support column fixed to the ground foundation, wherein a countersunk groove on the support column is embedded with a vertically arranged ball screw.

[0008] The connecting template is movably engaged with the ball screw through at least one template sub-block. It has an L-shaped bent plate structure and corresponds to the corner position of the well connecting the end well of the foundation pit and the standard section. An arc-shaped transition part is provided at the turning point of the L-shaped bent plate structure, and the arc-shaped transition part corresponds to the location of the construction joint.

[0009] The limiting structure is set on the support column and located on the upper and lower sides of the ball screw.

[0010] Furthermore, the ball screw is connected to the output end of the servo motor, the servo motor is fixed to the support structure, and at least one screw nut for connecting the template sub-block is provided on the ball screw, the screw nut rotating together with the ball screw.

[0011] Furthermore, the lead screw nut includes a locking component and a cylindrical shaft sleeved on the locking component, the cylindrical shaft cooperating with the ball screw, and the locking component being embedded in the template sub-block.

[0012] Furthermore, the limiting structure includes a limiting block disposed at the end of the ball screw that is not connected to the servo motor, and the travel of the connecting template on the ball screw ends at the limiting block.

[0013] Furthermore, the support column is connected to the ground foundation via a support steel plate.

[0014] Furthermore, the countersunk groove has a built-in self-lubricating material liner to reduce the frictional resistance when the template block is raised or lowered.

[0015] Furthermore, the connecting template has protrusions on its side, which can be embedded into adjacent standard section templates to complete the splicing.

[0016] Furthermore, a sealing ring is provided at the joint between the protrusion and the adjacent standard section template to prevent grout leakage and improve the flatness of the molding surface.

[0017] Furthermore, an attached vibrator is fixed to the back of the connecting template for vibration during concrete pouring.

[0018] The beneficial effects of this utility model are:

[0019] This utility model uses an L-shaped bending connecting template, along with a support structure and ball screws, to form a movable structure specifically designed for construction at the external corner of a foundation pit. The shape of the connecting template can adapt to the shape of the external corner of the end well, ensuring that the concrete is formed in one go and reducing the risk of joints and leakage. The lifting mechanism, composed of ball screws and template sub-blocks, provides a certain degree of flexibility in the docking position of the connecting template, greatly reducing the risk and difficulty of template erection at the external corner and saving construction costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure in one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the ball screw and the connecting template in one embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the support column in one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the template sub-block and lead screw nut in one embodiment of the present invention;

[0024] Figure 5This is a schematic diagram of the coupling structure in one embodiment of the present invention.

[0025] In the diagram: 1. Connecting template; 2. Side protrusion of connecting template; 3. Support column; 4. Support steel plate; 5. Ball screw; 6. Template sub-block; 7. Attached vibrator; 8. Limiting block; 9. Coupling limiting block; 10. Coupling; 11. Servo motor; 12. Screw nut; 13. Mounting hole; 14. Coarse bolt hole; 15. Fine bolt hole; 16. Keyway slot. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Specifically, the terms "first position" and "second position" refer to two different positions.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] This utility model provides a vertical sliding formwork device for concrete pouring at the external corner of a subway foundation pit. It consists of an L-shaped bent connecting formwork 1, a supporting structure, and ball screws 5, forming a movable structure specifically designed for construction at the external corner of the foundation pit. The specific structure is as follows:

[0030] exist Figure 1 , Figure 3In the example, the support structure includes two support columns 3 that are fixedly connected to the ground foundation by a support steel plate 4. The support column 3 is a cylindrical structure with a countersunk groove on its front longitudinal side. The support steel plate 4 is a rectangular block structure that is connected to the ground foundation to stabilize the entire device.

[0031] In some embodiments, slides can be provided on both sides of the countersunk groove, and the upper end of the slides can be inserted into and fixed to the limiting block 8. The limiting block 8 is a rectangular sheet-like slide that can limit the maximum stroke of the moving object in the countersunk groove. The countersunk groove has a built-in self-lubricating material pad to reduce the frictional resistance when the template sub-block 6 is raised and lowered.

[0032] Furthermore, in Figure 3 In the example, a vertically arranged ball screw 5 is embedded in the countersunk groove. The bottom of the ball screw 5 is connected to the output end of the servo motor 11 through the coupling 10, and the top of the ball screw 5 is connected to the limit block 8 as a limit structure. The servo motor 11 is fixed at the connection between the support column 3 and the support steel plate 4.

[0033] exist Figure 1 , Figure 2 In the example, the connecting template 1 has an L-shaped bent plate structure and corresponds to the corner position of the well connecting the end well of the foundation pit and the standard section. An arc-shaped transition part is provided at the turning point of the L-shaped bent plate structure. The arc-shaped transition part corresponds to the location of the construction joint. Four template sub-blocks 6 are also integrated behind the connecting template 1. These template sub-blocks 6 are divided into two groups, with two template sub-blocks 6 in each group arranged vertically.

[0034] exist Figure 2 In the example, the connecting template 1 is movably coupled to the two ball screws 5 via four template sub-blocks 6. By driving the ball screws 5, the template sub-blocks 6 cause the connecting template 1 to move up and down along the ball screws 5, thus forming a lifting mechanism. Wireless servo motors can be used; pressing the equipment control switch during operation will synchronously start the servo motors at both ends, realizing synchronous movement of the lifting support systems on both sides.

[0035] In some embodiments, the output end of the servo motor 11 is connected to the ball screw 5 via a coupling 10. The coupling 10 includes two semi-circular coupling modules that are combined with each other. The keyway 16 of one semi-circular coupling module is aligned with the keyway on the shaft and then engaged. The other semi-circular coupling module is then engaged, and the two are fastened together through the coarse bolt hole 14. Bolts are then screwed into the fine bolt hole 15 to strengthen the connection between the coupling 10 and the shaft. In addition, a coupling limiting block 9 can be provided between the coupling 10 and the lower end of the ball screw 5 to limit the travel of the connecting template 1 below, which can also serve as part of the limiting structure. The travel of the connecting template on the ball screw 5 ends at the limiting block 8 and the coupling limiting block 9.

[0036] Furthermore, in Figures 3-4 In the example, at least one screw nut 12 connecting the connecting template sub-block 6 is provided on the ball screw 5, and the screw nut 12 rotates together with the ball screw 5. Figure 4 In the example, the lead screw nut 12 includes a locking member and a cylindrical shaft sleeved on the locking member. The cylindrical shaft is fitted with the ball screw 5, and the locking member is embedded in the template sub-block 6.

[0037] In some embodiments, the connecting template 1 is provided with a protrusion 2 on its side. The protrusion 2 can be embedded into the adjacent standard section template to complete the splicing. A sealing ring is provided at the splicing point between the protrusion 2 and the adjacent standard section template to prevent grout leakage and improve the flatness of the forming surface.

[0038] In some embodiments, the attached vibrator 7 is fixed to the back of the connecting template 1 and is used for vibration during concrete pouring.

[0039] After the foundation pit is excavated to the design elevation of the corner of the end well, the fixing position of the bottom support steel plate of the device is determined according to the construction position of the corner. A bottom support steel plate 4 is laid on each of the straight sections on both sides and the support steel plate 4 is fixed with bolts.

[0040] During construction, the entire set of equipment is installed according to the site location. The connecting formwork 1 is lowered to the initial working section for concrete pouring. After the concrete has initially set, the servo motor 11 is activated to control the ball screw 5, which in turn controls the connecting formwork 1 to climb to the next working section for repeated operation. After the working surface is completed, the fixing bolts of the bottom support steel plate 4 are removed, and the entire equipment is transferred to the next working surface.

[0041] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A vertical sliding formwork device for concrete pouring at the external corner of a subway foundation pit end well, characterized in that, include: The support structure includes a support column (3) fixed to the ground foundation, and a vertically arranged ball screw (5) is embedded in a countersunk groove on the support column (3). The connecting template (1) is movably engaged with the ball screw (5) through at least one template sub-block (6). It has an L-shaped bent plate structure and corresponds to the corner position of the well at the end of the foundation pit and the standard section. An arc-shaped transition part is provided at the turning point of the L-shaped bent plate structure, and the arc-shaped transition part corresponds to the location of the construction joint. The limiting structure is set on the support column and located on the upper and lower sides of the ball screw (5).

2. The vertical sliding formwork device for concrete pouring at the external corner of the subway foundation pit end well according to claim 1, characterized in that, The ball screw (5) is connected to the output end of the servo motor (11), the servo motor (11) is fixed to the support structure, and at least one screw nut (12) for connecting the template sub-block (6) is provided on the ball screw (5), the screw nut (12) rotates together with the ball screw (5).

3. The vertical sliding formwork device for concrete pouring at the external corner of the subway foundation pit end well according to claim 2, characterized in that, The lead screw nut (12) includes a locking member and a cylindrical shaft sleeved on the locking member. The cylindrical shaft is fitted with the ball screw (5), and the locking member is embedded in the template sub-block (6).

4. The vertical sliding formwork device for concrete pouring at the external corner of the subway foundation pit end well according to claim 3, characterized in that, The limiting structure includes a limiting block (8) located at the end of the ball screw (5) that is not connected to the servo motor (11), and the travel of the connecting template on the ball screw (5) ends at the limiting block (8).

5. The vertical sliding formwork device for concrete pouring at the external corner of the subway foundation pit end well according to claim 1, characterized in that, The support column (3) is connected to the ground foundation through the support steel plate (4).

6. The vertical sliding formwork device for concrete pouring at the external corner of the subway foundation pit end well according to claim 3, characterized in that, The countersunk groove has a built-in self-lubricating material liner.

7. The vertical sliding formwork device for concrete pouring at the external corner of the subway foundation pit end well according to claim 1, characterized in that, The connecting template (1) has a protrusion (2) on its side, which can be embedded into the adjacent standard section template to complete the splicing.

8. The vertical sliding formwork device for concrete pouring at the external corner of the end well of a subway foundation pit according to claim 1, characterized in that, A sealing ring is provided at the joint between the protrusion (2) and the adjacent standard section template to prevent grout leakage and improve the flatness of the forming surface.

9. The vertical sliding formwork device for concrete pouring at the external corner of the end well of a subway foundation pit according to claim 1, characterized in that, An attached vibrator (7) is fixed on the back of the connecting template (1) and is used for vibration when the concrete is poured.

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