A soft soil open-cut tunnel base excavation and invert arch forming auxiliary device and shape control method

Abstract

The present invention provides a soft soil open-cut tunnel base excavation and invert arch forming auxiliary device and shape control method, belonging to the technical field of tunnel invert arch forming. A support beam that is not easily deformed is set above the invert arch to be constructed, and the shape control component on the support beam is used to adjust the shape of the flexible beam that is easily deformed so that the shape of the flexible beam is the same as the shape required for the invert arch. When pouring concrete for the tunnel invert arch, the height of the concrete pouring surface is adjusted based on the flexible beam so that the shape of the invert arch after pouring is consistent with the shape of the flexible beam; since the shape of the flexible beam is consistent with the shape required for the invert arch, the shape of the invert arch after pouring can be guaranteed to be consistent with the required shape. The accuracy of the invert arch construction is greatly improved, the probability of rework is effectively reduced, and the construction progress is guaranteed.

Description

Technical Field

[0001] The present invention generally relates to the technical field of tunnel invert arch forming, and in particular to a soft soil open-cut tunnel base excavation and invert arch forming auxiliary device and a shape control method. Background Art

[0002] Existing tunnel excavation methods are divided into two types: open-cut and underground. The open-cut method exposes the tunnel interior during excavation. This facilitates the pouring of concrete inside the tunnel, which then completes the laying of the tunnel's invert, side walls, and roof. Once the concrete is poured, loose soil is filled into the space outside the concrete walls, removing the exposure.

[0003] Arc-shaped inverted arches are often used for transition at the junction of the open-cut section and the shield section of the tunnel. For soft soil foundations, the base soil is relatively soft during excavation, and excavation machinery can easily affect the base. During the excavation of the soft soil foundation pit, in order to improve construction quality, ensure the thickness of the inverted arch, and prevent the encroachment of the structural clearance, the elevation of the excavation base must be strictly controlled. At the same time, the construction elevation of the cast arc-shaped inverted arch is difficult to control, which leads to elevation deviation of the top surface of the inverted arch or insufficient thickness of the inverted arch, which seriously violates the quality management red line. The use of a total station for arc surface positioning during casting requires a lot of time and the cooperation of technical personnel, affecting the construction progress. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a soft soil open excavation foundation pit base excavation and invert arch forming auxiliary device and shape control method.

[0005] In one aspect, the present invention provides a soft soil open-cut tunnel base excavation and invert arch forming auxiliary device, comprising:

[0006] A support beam is used to be arranged above the location where the inverted arch is to be constructed;

[0007] a flexible beam, the flexible beam being located above the position where the inverted arch is to be constructed and below the supporting beam;

[0008] A shape control component is installed on the support beam and connected to the flexible beam, and is used to control the shape of the flexible beam so that the shape of the flexible beam is the same as the shape required by the inverted arch.

[0009] According to the technical solution provided by the present invention, the shape control component includes:

[0010] a plurality of first telescopic devices, wherein one end of the first telescopic device is fixedly connected to the support beam and the other end is connected to the flexible beam;

[0011] The shape of the flexible beam is controlled by adjusting the expansion and contraction amounts of the first expansion and contraction devices.

[0012] According to the technical solution provided by the present invention, a plurality of the first telescopic devices are arranged at equal intervals along the extension direction of the support beam.

[0013] According to the technical solution provided by the present invention, the support beam is arranged horizontally, and movable components are fixedly installed at both ends;

[0014] The two moving components are used to drive the support beam, the flexible beam and the shape control component to move along a first direction; the first direction is a horizontal direction perpendicular to the support beam.

[0015] According to the technical solution provided by the present invention, the mobile component includes:

[0016] a first mobile frame, the first mobile frame being fixedly connected to the support beam;

[0017] a second telescopic device, one end of which is fixedly connected to the first movable frame;

[0018] a second mobile frame, the second mobile frame being fixedly connected to the other end of the second telescopic device;

[0019] A roller, the roller being mounted on a side of the second movable frame close to the ground and being used to abut against the horizontal ground on a side of the invert arch to be constructed;

[0020] The second telescopic device is used to adjust the distance between the first movable frame and the second movable frame.

[0021] According to the technical solution provided by the present invention, a group of the mobile components has two of the second telescopic devices;

[0022] By adjusting the extension and contraction amounts of the four second extension and contraction devices on the two groups of the moving components, the posture of the support beam is adjusted so that the support beam remains horizontal.

[0023] According to the technical solution provided by the present invention, one end of the first telescopic device close to the flexible beam is rotatably connected to the flexible beam, and the axis of rotation is parallel to the first direction.

[0024] On the other hand, the present invention also provides a shape control method for a soft soil open-cut tunnel base excavation and invert arch forming auxiliary device, which is used to control the shape of the soft soil open-cut tunnel base excavation and invert arch forming auxiliary device;

[0025] The shape control method comprises:

[0026] Establishing a coordinate system; the origin of the coordinate system is the midpoint of the support beam, and each coordinate axis of the coordinate system is parallel to the width direction of the inverted arch and parallel to the vertical direction;

[0027] Obtaining an analytical expression of the inverted arch in the coordinate system for the required shape of the inverted arch;

[0028] Obtaining the coordinates of one end of each of the first telescopic devices fixedly connected to the support beam in the coordinate system to obtain a plurality of first coordinates;

[0029] Calculating the distances of a plurality of the first coordinates along the extension direction of the first telescopic device to the analytical expression of the inverted arch to obtain a plurality of first distances;

[0030] Calculating a plurality of first telescopic amounts of a plurality of first telescopic devices according to a plurality of first distances;

[0031] The plurality of first telescopic devices are controlled to have corresponding first telescopic amounts, so that the shape of the flexible beam is the same as the required shape of the inverted arch.

[0032] According to the technical solution provided by the present invention, the inverted arch and the flexible beam are both in arc shape;

[0033] The method of obtaining the required shape of the inverted arch in the coordinate system includes:

[0034] Get the width and maximum depth of the inverted arch;

[0035] Calculating the arc radius of the inverted arch according to the width of the inverted arch and the maximum depth of the inverted arch;

[0036] An initial analytical expression of the inverted arch is calculated based on the radius of the circular arc shape;

[0037] The interception range of the initial analytical expression along each axis of the coordinate system is set to obtain the inverted arch analytical expression.

[0038] According to the technical solution provided by the present invention, setting the interception range of the initial analytical expression along each axis of the coordinate system to obtain the inverted arch analytical expression includes:

[0039] The variable value of the initial analytical expression along the width direction of the inverted arch is set to be greater than negative half of the width of the inverted arch and less than half of the width of the inverted arch, and the variable value of the initial analytical expression along the vertical direction is set to be less than zero, thereby obtaining the inverted arch analytical expression.

[0040] The beneficial effects of the present invention are:

[0041] A non-deformable support beam is placed above the invert arch to be constructed. The shape control assembly on the support beam adjusts the shape of the more deformable flexible beam to align with the desired invert arch shape. During the concrete pouring of the tunnel invert arch, the shape of the concrete pouring surface is adjusted based on the flexible beam to ensure that the final shape of the invert arch matches the flexible beam. Due to the consistent shape of the flexible beam, the top surface of the curved concrete invert arch can be quickly adjusted to ensure that the final shape of the invert arch matches the desired shape. This significantly improves the accuracy of invert arch construction, effectively reduces the need for rework, and ensures construction progress. The same principle is applied to control the shape of the tunnel base during excavation. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0043] Figure 1 This is a schematic diagram of the structure of an auxiliary device for base excavation and invert arch forming in soft soil open-cut tunnels;

[0044] Figure 2 A schematic diagram of the tunnel.

[0045] Figure 3 This is a front view of an auxiliary device for base excavation and invert arch forming in soft soil open-cut tunnels;

[0046] Figure 4 Schematic diagram of the geometric relationship of the flexible beam;

[0047] Among them: 1. Support beam; 2. Flexible beam; 3. Inverted arch; 4. First telescopic device; 5. First movable frame; 6. Second telescopic device; 7. Second movable frame; 8. Roller; 9. Tunnel side wall; 10. Top arch; 11. Rotating seat. DETAILED DESCRIPTION

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0049] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] It should be noted that the reference Figure 2 The inner wall of the tunnel includes: a bottom surface (in this embodiment, an inverted arch 3), two tunnel side walls 9, and a top arch 10.

[0051] Example 1

[0052] refer to Figure 1 and Figure 3 The present invention provides a soft soil open-cut tunnel base excavation and invert arch forming auxiliary device, comprising:

[0053] A support beam 1, which is not easily deformed and is used to be arranged above the location where the inverted arch 3 is to be constructed;

[0054] A flexible beam 2, which is easily deformable and has the same width as the inverted arch 3; the flexible beam 2 is located above the location of the inverted arch 3 to be constructed and below the support beam 1;

[0055] A shape control component is installed on the support beam 1 and connected to the flexible beam 2, and is used to control the shape of the flexible beam 2 so that the shape of the flexible beam 2 is the same as the shape required by the inverted arch 3.

[0056] Specifically, the flexible beam 2 is made of low-carbon steel or stainless steel, which has excellent formability and is suitable for application scenarios that require repeated bending in this embodiment.

[0057] When pouring concrete for the inverted arch 3 of the tunnel, the position of the pouring tool is adjusted based on the flexible beam 2 so that the shape of the inverted arch 3 after pouring is consistent with the shape of the flexible beam 2.

[0058] Since the shape of the flexible beam 2 is consistent with the desired shape of the inverted arch 3, the shape of the inverted arch 3 after casting can be guaranteed to be consistent with the desired shape. This greatly improves the accuracy of the inverted arch construction, effectively reduces the probability of rework, and ensures the construction progress.

[0059] Furthermore, the shape control component includes:

[0060] a plurality of first telescopic devices 4, wherein one end of the first telescopic device 4 is fixedly connected to the support beam 1 and the other end is connected to the flexible beam 2;

[0061] Specifically, a plurality of first telescopic devices 4 are sequentially distributed along the length of the support beam 1. The first telescopic devices 4 are hydraulic telescopic rods, and their telescopic direction is vertical. By adjusting the telescopic amount of different first telescopic devices 4, the shape of the flexible beam 2 is controlled.

[0062] The lengths of the plurality of first telescopic devices 4 are different. The first telescopic devices 4 near the middle of the flexible beam 2 are longer, and the first telescopic devices 4 near the ends of the flexible beam 2 are shorter.

[0063] Furthermore, a plurality of the first telescopic devices 4 are arranged at equal intervals along the extension direction of the support beam 1 .

[0064] Specifically, multiple first telescopic devices 4 arranged at equal intervals can make the control of the shape of the flexible beam 2 more accurate and stable, avoiding the situation where some positions are too concentrated, resulting in excessive stress and breakage of the flexible beam 2, or some positions are too sparse, resulting in the failure to achieve the desired shape.

[0065] Furthermore, the support beam 1 is arranged horizontally, and movable components are fixedly installed at both ends;

[0066] The two moving components are respectively in contact with the horizontal ground on both sides of the location where the inverted arch 3 is to be constructed, and are used to drive the support beam 1, the flexible beam 2 and the shape control component to move along the first direction; the first direction is the horizontal direction perpendicular to the support beam 1.

[0067] The first direction is the tunnel's extension direction (length direction). The two moving assemblies drive the entire soft soil open-cut tunnel base excavation and invert arch forming auxiliary device along the tunnel's length, thereby moving the flexible beam 2 to above the next invert arch 3 to be constructed.

[0068] Furthermore, the mobile component includes:

[0069] A first mobile frame 5, wherein the first mobile frame 5 is fixedly connected to the support beam 1;

[0070] a second telescopic device 6, one end of which is fixedly connected to the first movable frame 5;

[0071] a second mobile frame 7, the second mobile frame 7 being fixedly connected to the other end of the second telescopic device 6;

[0072] A roller 8 is mounted on the side of the second movable frame 7 close to the ground, and is used to abut against the horizontal ground on the side of the inverted arch 3 to be constructed;

[0073] The second telescopic device 6 is used to adjust the distance between the first movable frame 5 and the second movable frame 7 .

[0074] The first and second movable frames 5 and 7 are both constructed of rigid, non-deformable materials. The multiple second telescopic devices 6 have the same length, so their second telescopic amounts are also the same to ensure horizontality. When height adjustment is required, the second telescopic amounts are increased or decreased by the same amount simultaneously.

[0075] The roller 8 is a universal wheel with a fixed direction. When it is required to be set at the location where the inverted arch 3 is to be constructed, the direction of the roller 8 is fixed to avoid position deviation during the movement along the first direction. After the construction is completed, the roller 8 can be freely rotated to change direction for easy movement.

[0076] For example, the roller 8 can use the method disclosed in the document with application number 201920328773.0.

[0077] Furthermore, one group of the moving components has two of the second telescopic devices 6 .

[0078] Specifically, the second telescopic device 6 is a hydraulic telescopic rod.

[0079] By adjusting the extension and contraction amount of the four second extension and contraction devices 6 on the two groups of the moving components, the posture of the support beam 1 is adjusted so that the support beam 1 remains horizontal, thereby driving the flexible beam 2 to maintain its posture; or adjusting the overall height of the support beam 1 and the flexible beam 2.

[0080] In practice, if the flexible beam 2 and the first telescopic device 4 are fixed together by welding, they may break or become welded when adjusting the telescopic amount, thus damaging the entire device. If they are fixed by bolts, the bolts may break or the flexible beam 2 may become unable to deform.

[0081] The reason for this is that when the expansion and contraction amounts of two adjacent first expansion devices 4 vary, the shape of the flexible beam 2 must also change. In this embodiment, the first expansion devices 4 are arranged vertically, so the tangent direction of the connection point between the flexible beam 2 and the first expansion devices 4 will also change, thereby generating internal stress.

[0082] Furthermore, in order to solve the above problems, the present invention also makes the following improvements:

[0083] One end of the first telescopic device 4 close to the flexible beam 2 is rotatably connected to the flexible beam 2 , and the axis of rotation is parallel to the first direction.

[0084] Specifically, refer to Figure 3 The flexible beam 2 is provided with a rotating base 11, and the first telescopic device 4 is hinged to the rotating base 11. Therefore, the connection through the rotating base 11 can eliminate the stress caused by the change in the telescopic amount, ensuring that the flexible beam 2 can deform normally without generating excessive stress.

[0085] Specifically, the work process includes:

[0086] Move the soft soil open-cut tunnel base excavation and invert arch forming auxiliary device to above the invert arch 3 to be constructed;

[0087] Adjust the extension and contraction amounts of the plurality of second extension and contraction devices 6 to keep the support beam 1 horizontal;

[0088] Adjust the extension and contraction amounts of the plurality of first extension and contraction devices 4 so that the flexible beam 2 and the inverted arch 3 have the same desired shape;

[0089] During the construction process, the flexible beam 2 is used as a reference to set the position of the pouring tools and complete the pouring process;

[0090] Drive the soft soil open-cut tunnel base excavation and invert arch forming auxiliary device along the tunnel extension direction ( Figure 1 The robot moves to the next position (in the direction of the middle arrow, i.e. the first direction) and repeats the above process.

[0091] Example 2

[0092] The present invention also provides a shape control method for a soft soil open-cut tunnel base excavation and invert arch forming auxiliary device, which is used to control the shape of the soft soil open-cut tunnel base excavation and invert arch forming auxiliary device described above;

[0093] It should be noted that the inverted arch 3 and the flexible beam 2 are both in arc shape;

[0094] The shape control method comprises:

[0095] S1: Establish a coordinate system; the origin of the coordinate system is the midpoint of the support beam 1, and each coordinate axis of the coordinate system is parallel to the width direction of the inverted arch 3 and parallel to the vertical direction;

[0096] In this embodiment, the established coordinate system is a two-dimensional plane coordinate system. Figure 4 , O is the origin of the coordinate system, that is, the center point of the support beam 1; the coordinate system includes an X-axis and a Y-axis; the X-axis is parallel to the width direction of the inverted arch 3; the Y-axis is parallel to the vertical direction;

[0097] Point A is the midpoint of the chord length corresponding to the arc shape of the inverted arch 3 (or the arc shape of the flexible beam 2, which will be described below based on the arc shape of the inverted arch 3); Point B is the endpoint of the flexible beam 2 (the endpoint of the arc shape corresponding to the chord length); Point C is the center point of the circle corresponding to the arc shape of the inverted arch 3;

[0098] R is the radius of the circle corresponding to the arc shape of the inverted arch 3; D is the width of the inverted arch; and H is the maximum depth of the inverted arch.

[0099] S2: Obtaining an analytical expression of the inverted arch 3 in the coordinate system, which includes:

[0100] S2-1: Obtain the width D and maximum depth H of the inverted arch according to the design drawings;

[0101] S2-2: Calculating the arc radius R of the inverted arch 3 according to the width D of the inverted arch and the maximum depth H of the inverted arch;

[0102] Calculation process: According to Figure 4It can be seen that points A, B, and C form a right triangle, and the distance between points B and C is equal to R, the distance between points A and B is equal to 0.5D, and the distance between points A and C is equal to R minus H; the specific value of R is calculated according to the Pythagorean theorem.

[0103] S2-3: Calculating an initial analytical expression of the inverted arch 3 according to the radius of the arc shape, including:

[0104] Measuring the distance L from the endpoint B of the flexible beam 2 to the support beam 1 in the vertical direction is equivalent to obtaining the distance from point A to point O;

[0105] Then we can get the coordinates of point A (0, -L); the coordinates of point B (0.5D, -L); and the coordinates of point C (0, RHL).

[0106] At this point, the coordinates of the center of the circle corresponding to the arc shape (the coordinates of point C) and the radius R are known, and its initial analytical expression can be obtained:

[0107] Formula 1;

[0108] in, x represents the coordinate along the X axis, y Represents the coordinate along the Y axis.

[0109] S2-4: Setting the interception range of the initial analytical expression along each axis of the coordinate system to obtain the inverted arch analytical expression, including:

[0110] The variable value of the initial analytical expression along the width direction of the inverted arch 3 is set to be greater than negative half of the width of the inverted arch and less than half of the width of the inverted arch, and the variable value of the initial analytical expression along the vertical direction is set to be less than zero, thereby obtaining the inverted arch analytical expression.

[0111] Specifically, since in this embodiment, the flexible beam 2 and the inverted arch 3 have equal widths, the coordinates of the points on the inverted arch analytical expression along the X-axis need to be greater than -0.5D and less than 0.5D; at the same time, the flexible beam 2 is located below the supporting beam 1, so the coordinates of the points on the inverted arch analytical expression along the Y-axis are all less than 0.

[0112] From this we can get the analytical formula of the inverted arch:

[0113] Formula 2.

[0114] S3: Acquire the coordinates of one end of the first telescopic device 4 fixedly connected to the support beam 1 in the coordinate system to obtain a plurality of first coordinates;

[0115] Since the first telescopic devices 4 are arranged at equal intervals in this embodiment, all first coordinates can be obtained by taking an odd number of first telescopic devices 4 and the coordinate of the end of the middle first telescopic device 4 fixedly connected to the support beam 1 as (0, 0) as an example. The same applies to an even number of first telescopic devices 4.

[0116] That is, the first coordinates are... (-2S, 0) (-S, 0) (0, 0) (S, 0) (2S, 0)...

[0117] Wherein, S represents the interval between two adjacent first telescopic devices 4 .

[0118] S4: Calculating the distances from a plurality of first coordinates along the extension direction of the first telescopic device 4 to the analytical expression of the inverted arch to obtain a plurality of first distances;

[0119] Substitute all the horizontal coordinates of the multiple first coordinates (including: ..., -2S, -S, 0, S, 2S, ...) into the analytical expression of the inverted arch x , calculate and obtain the longitudinal coordinates of the connection points between the plurality of first telescopic devices 4 and the flexible beam 2;

[0120] Absolute values ​​of the vertical coordinates of the multiple connection points are taken to obtain multiple first distances.

[0121] S5: Calculating a plurality of first telescopic amounts of a plurality of first telescopic devices 4 according to a plurality of first distances;

[0122] S6: Control the plurality of first telescopic devices 4 to have corresponding first telescopic amounts, so that the shape of the flexible beam 2 is the same as the required shape of the inverted arch 3 .

[0123] Specifically, since in this embodiment, the lengths of the first telescopic devices 4 are different, it is necessary to measure the lengths of the first telescopic devices 4 themselves (excluding the protruding portions), and then control the respective telescopic amounts according to the first distances corresponding to them, so that the first telescopic amount plus the length of the first telescopic device 4 itself equals the first distance.

[0124] It should be noted that if Figure 4 Point A is the origin of the coordinate system and can also be used for calculation and corresponding adjustments. The process is similar to the above process and will not be repeated here.

[0125] Based on the solution of Example 2, the shape of the flexible beam 2 can be ensured to be consistent with the required shape of the inverted arch 3. During the construction process, the error caused by the inaccurate shape of the flexible beam 2 is eliminated, further ensuring the accuracy of the construction.

[0126] In some embodiments, a computer may be mounted to perform the above calculations and complete corresponding controls.

[0127] When in use, it is only necessary to input the specific values ​​of the four data, namely, the width D of the inverted arch, the maximum depth H of the inverted arch, the distance L from the end point B of the flexible beam 2 to the support beam 1 in the vertical direction, and the interval S between two adjacent first telescopic devices 4, into the computer, and the first telescopic amounts of multiple first telescopic devices 4 can be automatically calculated.

[0128] Then the computer can automatically control the extension and contraction of the hydraulic telescopic rod to achieve the purpose of automatically controlling the shape of the flexible beam 2. Since only a few parameter values ​​need to be manually input to automatically complete the shape control, manpower is saved and construction efficiency can be improved.

[0129] The above description is merely a preferred embodiment of the present invention and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in the present invention.

Claims

1. A soft soil open-cut tunnel base excavation and invert arch forming auxiliary device, characterized in that: include: A support beam (1) is used to be arranged above the location where the inverted arch (3) is to be constructed; A flexible beam (2), the flexible beam (2) being located above the position where the inverted arch (3) is to be constructed and below the support beam (1); a shape control component, the shape control component being mounted on the support beam (1) and connected to the flexible beam (2), and being used to control the shape of the flexible beam (2) so that the shape of the flexible beam (2) is the same as the shape required by the inverted arch (3); The shape control component includes: a plurality of first telescopic devices (4), wherein one end of each of the first telescopic devices (4) is fixedly connected to the support beam (1), and the other end is connected to the flexible beam (2); By adjusting the different telescopic amounts of the first telescopic device (4), the shape of the flexible beam (2) is controlled; The support beam (1) is arranged horizontally, and movable components are fixedly mounted at both ends; the two movable components are used to drive the support beam (1), the flexible beam (2) and the shape control component to move along a first direction; the first direction is a horizontal direction perpendicular to the support beam (1); The mobile component includes: A first mobile frame (5), the first mobile frame (5) being fixedly connected to the support beam (1); a second telescopic device (6), one end of the second telescopic device (6) being fixedly connected to the first movable frame (5); A second movable frame (7), the second movable frame (7) being fixedly connected to the other end of the second telescopic device (6); A roller (8), the roller (8) being mounted on a side of the second movable frame (7) close to the ground and being used to abut against the horizontal ground on a side of the inverted arch (3) where the inverted arch (3) is to be constructed; The second telescopic device (6) is used to adjust the distance between the first movable frame (5) and the second movable frame (7).

2. The soft soil open-cut tunnel base excavation and invert arch forming auxiliary device according to claim 1, characterized in that: A plurality of the first telescopic devices (4) are arranged at equal intervals along the extension direction of the support beam (1).

3. The soft soil open-cut tunnel base excavation and invert arch forming auxiliary device according to claim 1, characterized in that: One set of the moving components has two of the second telescopic devices (6); By adjusting the extension and contraction amounts of the four second extension and contraction devices (6) on the two groups of the moving components, the posture of the support beam (1) is adjusted so that the support beam (1) remains horizontal.

4. The soft soil open-cut tunnel base excavation and invert arch forming auxiliary device according to claim 1, characterized in that: One end of the first telescopic device (4) close to the flexible beam (2) is rotatably connected to the flexible beam (2), and the axis of rotation is parallel to the first direction.

5. A shape control method for a soft soil open-cut tunnel base excavation and invert arch forming auxiliary device, characterized in that: Used to control the shape of the soft soil open-cut tunnel base excavation and invert arch forming auxiliary device according to any one of claims 1 to 4; The shape control method comprises: Establishing a coordinate system; the origin of the coordinate system is the midpoint of the support beam (1), and each coordinate axis of the coordinate system is parallel to the width direction of the inverted arch (3) and parallel to the vertical direction; Obtaining an analytical expression of the inverted arch (3) in the coordinate system for the required shape of the inverted arch; Obtaining the coordinates of one end of a plurality of first telescopic devices (4) fixedly connected to the support beam (1) in the coordinate system to obtain a plurality of first coordinates; Calculating the distances of a plurality of first coordinates along the extension direction of the first telescopic device (4) to the analytical expression of the inverted arch to obtain a plurality of first distances; Calculating a plurality of first telescopic amounts of a plurality of first telescopic devices (4) according to a plurality of the first distances; The plurality of first telescopic devices (4) are controlled to have corresponding first telescopic amounts, so that the shape of the flexible beam (2) is the same as the required shape of the inverted arch (3).

6. The shape control method of a soft soil open-cut tunnel base excavation and invert arch forming auxiliary device according to claim 5, characterized in that: The inverted arch (3) and the flexible beam (2) are both in the shape of circular arcs; The analytical formula for obtaining the required shape of the inverted arch (3) in the coordinate system includes: Get the width and maximum depth of the inverted arch; Calculating the arc radius of the inverted arch (3) according to the width of the inverted arch and the maximum depth of the inverted arch; An initial analytical expression of the inverted arch (3) is calculated based on the radius of the circular arc shape; The interception range of the initial analytical expression along each axis of the coordinate system is set to obtain the inverted arch analytical expression.

7. The shape control method of a soft soil open-cut tunnel base excavation and invert arch forming auxiliary device according to claim 6, characterized in that: Setting the interception range of the initial analytical expression along each axis of the coordinate system to obtain the inverted arch analytical expression includes: The variable value of the initial analytical expression along the width direction of the inverted arch (3) is set to be greater than negative half of the width of the inverted arch and less than half of the width of the inverted arch, and the variable value of the initial analytical expression along the vertical direction is set to be less than zero, thereby obtaining the inverted arch analytical expression.

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