Drilling secant pile casing pipe for foundation pit support construction and inclination detection method

Abstract

The invention discloses a drilling secant pile casing pipe for foundation pit support construction and an inclination detection method, and relates to the technical field of building construction.The first aspect is that the drilling secant pile casing pipe for foundation pit support construction comprises a casing pipe body, a protection opening is formed in the casing pipe body, and a lantern ring is coaxially arranged at the top of the outer wall of the casing pipe body; a detection bowl is arranged on the lantern ring in a surrounding mode and comprises a transparent top plate and a shading bottom plate which are sequentially arranged from top to bottom, a liquid cavity used for containing colored liquid is reserved between the transparent top plate and the shading bottom plate, and scale marks used for observing the liquid level in the detection bowl are arranged on the top face of the transparent top plate. At least four groups of optical sensors for detecting the position of the colored liquid in the detection bowl on the scale marks are annularly and uniformly distributed on the sleeve ring, and all the optical sensors are distributed around the sleeve body in a central symmetry manner. On the second aspect, the invention discloses a drilling secant pile casing inclination detection method for foundation pit support construction. According to the invention, whether the inclination degree of the sleeve is too large can be effectively detected.

Description

Technical Field

[0001] The present invention relates to the technical field of optical verticality detection, and particularly relates to a casing for bored secant piles in foundation pit retaining construction and an inclination detection method. Background Art

[0002] The secant pile is a form of the retaining wall of the deep foundation pit. The construction process of the secant pile usually is: first, construct the guide wall at the predetermined pile position; then implant the casing of the secant pile into the inner side of the guide wall; drive the casing to the designed depth by using the full casing drilling rig; complete the soil extraction operation inside the casing; then pour concrete into the casing; and finally, pull out the casing section by section before the initial setting of the concrete.

[0003] The verticality detection is crucial for the casing of the bored secant pile, because it directly determines whether the adjacent piles can achieve effective biting, thereby ensuring the water stop tightness and structural integrity of the entire secant pile diaphragm wall.

[0004] As described in the Chinese patent with the publication number CN111980018B for the existing casing of the bored secant pile, the verticality of the casing is judged according to the load blocks and the pendulum balls outside the casing. However, during the drilling construction process, the vibration of the rotary drilling rig will be transmitted to the casing, causing the load blocks to shift. Since it is not easy for the load blocks to reset after shifting, there may be a phenomenon that the vibration of the casing causes the load blocks to shift, but in fact, the casing still maintains verticality after the vibration ends, resulting in misjudgment and affecting the construction efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide an optical detection part arranged on the casing, which uses the characteristics of rapid liquid reset, the acquisition function of the optical sensor, and the algorithm for image information processing to form a casing for bored secant piles in foundation pit retaining construction and an inclination detection method, which can effectively detect whether the inclination degree of the casing is too large.

[0006] To solve the above technical problems, the present invention adopts the following solutions: In a first aspect, a casing for a bored secant pile used in foundation pit retaining construction includes an optical detection part and a casing body. The optical detection part includes a collar, a detection bowl for containing a colored liquid and having scale lines, an optical sensor for collecting the position information of the liquid level of the colored liquid on the scale lines, a controller, and an alarm. The collar is provided at the top of the outer wall of the casing body. A funnel-shaped mouth protector is provided on the casing body. The collar and the detection bowl are coaxially arranged with the casing body. The optical sensor and the detection bowl are sequentially arranged on the outer wall of the collar from top to bottom. The detection bowl includes a transparent top plate and a light-shielding bottom plate sequentially arranged from top to bottom. A liquid cavity for containing the colored liquid is left between the transparent top plate and the light-shielding bottom plate. The scale lines are provided on the top surface of the transparent top plate. The scale values on the scale lines gradually increase or gradually decrease along the radial direction of the casing body. At least four groups of optical sensors are evenly distributed in a ring on the collar. All the optical sensors are centrosymmetrically distributed around the casing body. The controller is electrically connected to all the optical sensors, and the controller is electrically connected to an alarm for giving an alarm reminder. The controller is used to process the image information collected by the optical sensors. Taking each piece of image information collected by the optical sensors as instant image information, taking the change direction of the scale value of the scale line in the instant image information as the up-down direction, and taking the scale value where the liquid level point on the symmetry line in the left-right direction in the instant image information is located as the liquid level value. Dividing the sum of all the liquid level values obtained within a predetermined fixed time period by the number of instant image information within the predetermined fixed time period to obtain the liquid level average value of the optical sensor. Subtracting the liquid level average values obtained by every two symmetrically arranged optical sensors on both sides of the casing body and taking the absolute value of the difference. Taking the largest value among all the absolute values after subtraction as the inclination extreme value. Comparing the inclination extreme value with a preset inclination threshold. When the inclination extreme value is greater than the inclination threshold, sending an alarm message to the alarm for alarm reminder. The colored liquid, the scale lines, and the light-shielding bottom plate have different colors and obvious color differences. Its function is that through the setting of the optical sensor, the position of the colored liquid on the scale line can be collected. When the casing body generates excessive inclination, the colored liquid at the lower part of the detection bowl is on a higher scale line, and the colored liquid at the higher part of the detection bowl is on a lower scale line. Subtracting the lowest scale value where the colored liquid is located from the highest scale value where the colored liquid is located can obtain the maximum difference. Comparing this maximum difference with a predetermined threshold can know whether the casing body is excessively inclined; through the setting of the transparent top plate, it is convenient for the optical sensor to observe the position of the liquid level in the liquid cavity on the scale line through the transparent top plate; through the setting of the light-shielding bottom plate, it is possible to avoid the environmental color below the detection bowl from affecting the judgment of the position of the liquid level on the scale line.

[0007] The optical detection unit is configured to hold a colored liquid and mark a scale line through the arrangement of the detection bowl. By leveraging the property that the liquid easily returns to its original state, it can be directly reused after adjusting the perpendicularity of the sleeve, thus avoiding misjudgment. Meanwhile, the optical characteristics of the optical sensor are utilized to collect the position information of the liquid level on the scale line, and the controller with an algorithm for judging perpendicularity is set to achieve the effect of judging the perpendicularity of the sleeve.

[0008] Furthermore, at least four mounting brackets for installing optical sensors are evenly distributed around the sleeve body on the collar, and at least one set of optical sensors is provided on each mounting bracket. Its function is that through the design of the number of mounting brackets, it is possible to collect the liquid level position information at all angles in all areas on the detection bowl as much as possible.

[0009] Furthermore, both the transparent top plate and the light-shielding bottom plate are in the shape of a concave conical surface surrounding the sleeve body, and a liquid inlet for communicating with the liquid chamber is provided at the top of the transparent top plate. Its function is that through the design of the shape of the liquid chamber, the liquid in the liquid chamber can concentrate from the surrounding to the central position by gravity, making the liquid level located at the edge, which is convenient for observing the change of the liquid level.

[0010] Furthermore, a plurality of isolation strips are evenly distributed in a ring around the sleeve body in the liquid chamber. A viewing chamber for the colored liquid to flow in is left between every two adjacent isolation strips. The upper and lower surfaces of each isolation strip are hermetically connected to the bottom surface of the transparent top plate and the top surface of the light-shielding bottom plate respectively. The liquid chamber also includes a communication chamber provided at the bottom of the liquid chamber for connecting all the viewing chambers. Its function is that through the setting of the isolation strips, each viewing chamber can be separated, thereby reducing the liquid level area in each chamber. Since the energy of the liquid level fluctuation in a smaller area will quickly reach the boundary (the side wall of the isolation strip and the inner wall of the liquid chamber) and be absorbed or reflected back, the reflected wave cancels out the original wave, resulting in the rapid attenuation of the fluctuation, which is convenient for observing the position of the liquid level. The liquid inlet is connected to one of the viewing chambers. Through the setting of the communication chamber, all the liquids in the liquid chamber can be connected as a whole. Only by injecting colored liquid into one viewing chamber can the colored liquid reach all the viewing chambers through the communication chamber, ensuring that the colored liquids in all the viewing chambers are at the same scale line when the detection bowl is perpendicular to the ground.

[0011] Furthermore, the scale line is in the form of concentric multiple circular rings with the center of the circle located on the axis of the sleeve body and the diameter gradually expanding from the inside to the outside. The extending direction of the viewing chamber is perpendicular to the scale line. Its function is that through the design of the shape and distribution of the scale line, it is convenient to observe the change of the liquid level in the detection bowl.

[0012] Further, the detection bowl further includes a mounting ring. The inner walls of the transparent top plate and the light-shielding bottom plate are both connected to the outer wall of the mounting ring. The mounting ring is in the shape of a circular ring coaxial with the sleeve body. The collar includes an upper collar nested on the top end of the mounting ring and a lower collar nested on the bottom end of the mounting ring. Its function is that through the arrangement of the upper collar and the lower collar, it is convenient to sequentially install the lower collar, the detection bowl, the upper collar, and the mouth guard on the sleeve body from top to bottom, and then fix the upper collar and the lower collar on the sleeve body.

[0013] Further, buffer pads are provided between the upper collar and the mounting ring and between the lower collar and the mounting ring. Its function is that through the arrangement of the buffer pads, the vibration transmitted from the sleeve body to the detection bowl can be reduced, thereby reducing the influence of the vibration on the liquid level in the detection bowl.

[0014] Further, the collar further includes a shock-absorbing ring for direct contact with the sleeve body. The upper collar and the lower collar are both provided with bolts that penetrate the collar and are threadedly connected to the sleeve body. The shock-absorbing ring is made of an elastic material, such as rubber. Its function is that through the arrangement of the shock-absorbing ring, the vibration between the collar and the sleeve body can be effectively reduced.

[0015] In a second aspect, a method for detecting the inclination of a casing for a bored secant pile used in foundation pit retaining construction, which is applied to the above-mentioned casing for a bored secant pile used in foundation pit retaining construction, includes the following steps: Step S1: Collect image information including the liquid level and scale lines at corresponding positions through an optical sensor; Step S2: Take each piece of image information collected by the optical sensor as instant image information. Take the direction of the change in the measured value of the scale line in the instant image information as the up-down direction, and take the measured value of the scale at the liquid level point on the symmetry line in the left-right direction in the instant image information as the liquid level value; the symmetry line in the left-right direction in the instant image information is parallel to the up-down direction in the instant image information.

[0016] Step S3: Divide the sum of all the liquid level values obtained within a predetermined fixed time period by the number of instant image information within the predetermined fixed time period to obtain the average liquid level value obtained by the optical sensor; Step S4: Subtract the average liquid level values obtained by two symmetrically arranged optical sensors on both sides of the sleeve body and take the absolute value of the difference. Take the largest value among all the absolute values after subtraction as the inclination extreme value; Step S5: Compare the inclination extreme value with a preset inclination threshold. When the inclination extreme value is greater than the inclination threshold, send an alarm message to the alarm for alarm reminder.

[0017] The optical sensor uses a camera; In step S2, the liquid level value is taken as the ceiling value or the floor value of the scale value taken upward or downward at the liquid level point on the symmetry line in the left-right direction in the instant image information collected by the camera, or the average value of the two adjacent scale values at the liquid level point.

[0018] The beneficial effects of the present invention are as follows: 1. Through the setting of the optical sensor, the position of the colored liquid on the scale line can be collected. When the sleeve body is tilted too much, the colored liquid at the lower part of the detection bowl is on a higher scale line, and the colored liquid at the higher part of the detection bowl is on a lower scale line. By subtracting the lowest scale value where the colored liquid is located from the highest scale value where the colored liquid is located, the maximum difference can be obtained. Comparing this maximum difference with a predetermined threshold can determine whether the sleeve body is excessively tilted; through the setting of the transparent top plate, it is convenient for the optical sensor to observe the position of the liquid level in the liquid cavity on the scale line through the transparent top plate; through the setting of the light-shielding bottom plate, the environmental color below the detection bowl is avoided from affecting the judgment of the position of the liquid level on the scale line. 2. Through the setting of the isolation strip, each observation cavity can be separated, thereby reducing the liquid level area in each cavity. Since the energy of the liquid level fluctuation with a smaller area will quickly reach the boundary (the side wall of the isolation strip and the inner wall of the liquid cavity) and be absorbed or reflected back, and the reflected wave cancels out the original wave, resulting in the rapid attenuation of the fluctuation, which is convenient for observing the position of the liquid level. 3. The liquid inlet is connected to one of the observation cavities. Through the setting of the communication cavity, all the liquids in the liquid cavity can be connected as a whole. Only by injecting colored liquid into one observation cavity can the colored liquid reach all the observation cavities through the communication cavity, ensuring that the colored liquids in all the observation cavities are on the same scale line when the detection bowl is perpendicular to the ground. Description of the Drawings

[0019] Figure 1 It is a three-dimensional structural schematic diagram of Embodiment 1; Figure 2 It is a cross-sectional structural schematic diagram of Embodiment 1 at the liquid inlet (excluding the sleeve body and the protective mouth); Figure 3 It is a three-dimensional structural schematic diagram of Embodiment 1 in the state of hiding the transparent top plate (excluding the sleeve body and the protective mouth); Figure 4 For Figure 2 The enlarged structural schematic diagram at A in Figure 5 It is a schematic diagram of the instant image information collected by the optical sensor in Embodiment 1; Figure 6 It is a schematic diagram of the tilt detection method flow of Embodiment 1.

[0020] Reference numerals: 1, casing body; 2, protective mouth; 3, collar; 4, detection bowl; 401, transparent top plate; 402, light-shielding bottom plate; 403, mounting ring; 5, scale line; 6, optical sensor; 7, mounting bracket; 8, liquid chamber; 801, observation chamber; 802, communication chamber; 9, liquid inlet; 10, isolation strip; 11, upper collar; 12, lower collar; 13, buffer pad; 14, shock-absorbing ring; a, symmetry line; b, liquid level point. Detailed implementation manners

[0021] The present invention will be further described in detail below in conjunction with embodiments and the accompanying drawings, but the implementation manners of the present invention are not limited thereto.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0023] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "provided with", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] Embodiment 1 A casing for a bored secant pile for foundation pit retaining construction, such as Figure 1 , Figure 2As shown in the figure, it includes an optical detection part and a sleeve body 1. The optical detection part includes a collar 3, a detection bowl 4 for containing a colored liquid and having scale lines 5, an optical sensor 6 for collecting the position information of the liquid level of the colored liquid on the scale lines 5, a controller, and an alarm. The collar 3 is arranged on the top outer wall of the sleeve body 1. A funnel-shaped mouth guard 2 is provided on the sleeve body 1. The collar 3 and the detection bowl 4 are both coaxially arranged with the sleeve body 1. The optical sensor 6 and the detection bowl 4 are sequentially arranged on the outer wall of the collar 3 from top to bottom. The detection bowl 4 includes a transparent top plate 401 and a light-shielding bottom plate 402 arranged sequentially from top to bottom. A liquid cavity 8 for containing the colored liquid is left between the transparent top plate 401 and the light-shielding bottom plate 402. The scale lines 5 are arranged on the top surface of the transparent top plate 401. The scale values on the scale lines 5 gradually increase or gradually decrease along the radial direction of the sleeve body 1. At least four groups of the optical sensors 6 are evenly distributed in a ring on the collar 3, and all the optical sensors 6 are centrosymmetrically distributed around the sleeve body 1. The controller is electrically connected to all the optical sensors 6, and the controller is electrically connected to an alarm for giving an alarm reminder. The controller is used to process the image information collected by the optical sensors 6. Taking each piece of image information collected by the optical sensors 6 as instant image information, taking the changing direction of the scale value of the scale lines 5 in the instant image information as the up-down direction, and taking the scale value where the liquid level point b on the symmetry line a in the left-right direction in the instant image information is located as the liquid level value. Taking the sum of all the liquid level values obtained within a predetermined fixed time period and dividing it by the number of instant image information within the predetermined fixed time period to obtain the liquid level average value of the optical sensor 6. Subtracting the liquid level average values obtained by every two symmetrically arranged optical sensors 6 on both sides of the sleeve body and taking the absolute value of the difference, and taking the largest value among all the absolute values after subtraction as the tilt extreme value. Comparing the tilt extreme value with a preset tilt threshold, when the tilt extreme value is greater than the tilt threshold, sending an alarm message to the alarm for alarm reminder. The colored liquid is red, the scale lines are black, and the light-shielding bottom plate is white. Its function is that through the setting of the optical sensor 6, the position of the colored liquid on the scale lines 5 can be collected. When the sleeve body 1 generates too large a tilt, the colored liquid at the lower part of the detection bowl 4 is on the higher scale lines 5, and the colored liquid at the higher part of the detection bowl 4 is on the lower scale lines 5. Subtracting the lowest scale value where the colored liquid is located from the highest scale value where the colored liquid is located can obtain the maximum difference. Comparing this maximum difference with a predetermined threshold can know whether the sleeve body 1 is overly tilted; through the setting of the transparent top plate 401, it is convenient for the optical sensor 6 to observe the position of the liquid level in the liquid cavity 8 on the scale lines 5 through the transparent top plate 401; through the setting of the light-shielding bottom plate 402, it is possible to avoid the environmental color below the detection bowl 4 from affecting the judgment of the position of the liquid level on the scale lines 5.

[0025] Specifically, as Figure 1 shown, at least four mounting brackets 7 for mounting the optical sensors 6 are evenly distributed around the sleeve body 1 on the collar 3, and at least one set of optical sensors 6 is provided on each mounting bracket 7. Its function is that through the design of the number of mounting brackets 7, it is possible to collect the liquid level position information at all angles in all areas on the detection bowl 4 as much as possible.

[0026] Specifically, as Figure 2 shown, both the transparent top plate 401 and the light-shielding bottom plate 402 are in the shape of a concave conical surface surrounding the sleeve body 1. As Figure 4 shown, a liquid inlet 9 for communicating with the liquid chamber 8 is provided at the top of the transparent top plate 401. Its function is that through the design of the shape of the liquid chamber 8, the liquid in the liquid chamber 8 can concentrate from all around to the central position by gravity, making the liquid level at the edge, which is convenient for observing the change of the liquid level.

[0027] Specifically, as Figure 3 shown, a plurality of partition bars 10 are evenly distributed in a ring around the sleeve body 1 in the liquid chamber 8. An observation chamber 801 for allowing the colored liquid to flow in is left between every two adjacent partition bars 10. The upper and lower surfaces of each partition bar 10 are respectively sealed with the bottom surface of the transparent top plate 401 and the top surface of the light-shielding bottom plate 402. The liquid chamber 8 further includes a communication chamber 802 provided at the bottom of the liquid chamber 8 for communicating all the observation chambers 801. Its function is that through the arrangement of the partition bars 10, each observation chamber 801 can be separated, thereby reducing the liquid level area in each chamber. Since the energy of the liquid level fluctuation in a smaller area will quickly reach the boundary (the side wall of the partition bar 10 and the inner wall of the liquid chamber 8) and be absorbed or reflected back, the reflected wave cancels out the original wave, resulting in the rapid attenuation of the fluctuation, which is convenient for observing the position of the liquid level; the liquid inlet 9 is communicated with one of the observation chambers 801. Through the arrangement of the communication chamber 802, all the liquids in the liquid chamber 8 can be connected as a whole. Only by injecting the colored liquid into one observation chamber 801 can the colored liquid reach all the observation chambers 801 through the communication chamber 802, ensuring that the colored liquids in all the observation chambers 801 are at the same scale line 5 when the detection bowl 4 is perpendicular to the ground.

[0028] Specifically, as Figure 1 shown, the scale line 5 is in the shape of concentric multiple circular rings with the center located on the axis of the sleeve body 1 and the diameter gradually expanding from the inside to the outside. The extending direction of the observation chamber 801 is perpendicular to the scale line 5. Its function is that through the design of the shape and distribution of the scale line 5, it is convenient to observe the change of the liquid level in the detection bowl 4.

[0029] Specifically, as Figure 1As shown, the detection bowl 4 further includes a mounting ring 403. The inner walls of the transparent top plate 401 and the light-shielding bottom plate 402 are both connected to the outer wall of the mounting ring 403. The mounting ring 403 is in the shape of a circular ring coaxial with the sleeve body 1. The collar 3 includes an upper collar 11 nested on the top end of the mounting ring 403 and a lower collar 12 nested on the bottom end of the mounting ring 403. Its function is that through the settings of the upper collar 11 and the lower collar 12, it is convenient to sequentially install the lower collar 12, the detection bowl 4, the upper collar 11, and the mouth protector 2 on the sleeve body 1 from top to bottom, and then fix the upper collar 11 and the lower collar 12 on the sleeve body 1.

[0030] Specifically, as Figure 2 shown, buffer pads 13 are provided between the upper collar 11 and the mounting ring 403 and between the lower collar 12 and the mounting ring 403. Its function is that through the setting of the buffer pads 13, the vibration transmitted from the sleeve body 1 to the detection bowl 4 can be reduced, thereby reducing the influence of vibration on the liquid level in the detection bowl 4.

[0031] Specifically, as Figure 1 shown, the collar 3 further includes a shock-absorbing ring 14 for directly contacting the sleeve body 1. Bolts are provided on both the upper collar 11 and the lower collar 12 and are threadedly connected to the sleeve body 1 through the collar 3. The shock-absorbing ring 14 is made of an elastic material such as rubber. Its function is that through the setting of the shock-absorbing ring 14, the vibration between the collar 3 and the sleeve body 1 can be effectively reduced.

[0032] A method for detecting the inclination of a casing for a bored secant pile in foundation pit retaining construction, which is applied to the above-mentioned casing for a bored secant pile in foundation pit retaining construction, as Figure 6 shown, includes the following steps: Step S1: Use an optical sensor 6 to collect image information including the liquid level and the scale line 5 at the corresponding position; Step S2: Take each piece of image information collected by the optical sensor 6 as the instant image information. Take the direction of the change in the measured value of the scale line in the instant image information as the up and down direction, and take the measured value of the liquid level point b on the symmetry line a in the left and right direction of the instant image information as the liquid level value. As Figure 5 shown, the liquid level value is taken as "13"; the symmetry line a in the left and right direction in the instant image information is parallel to the up and down direction in the instant image information.

[0033] Step S3: Divide the sum of all the liquid level values obtained within a predetermined fixed time period by the number of instant image information within the predetermined fixed time period to obtain the average liquid level obtained by the optical sensor; Step S4: Subtract the average liquid levels obtained by two symmetrically arranged optical sensors 6 on both sides of the sleeve body 1 and take the absolute value of the difference. Take the largest value among all the absolute values after subtraction as the inclination extreme value; Step S5: Compare the tilt extreme value with a preset tilt threshold. When the tilt extreme value is greater than the tilt threshold, send an alarm message to the alarm for alarm reminder.

[0034] The optical sensor 6 uses a camera. In step S2, take the upward-rounded scale value of the liquid surface point b on the symmetry line a in the left-right direction in the instant image information collected by the camera as the corresponding liquid level value.

[0035] The working principle of this embodiment is described as follows: Before use, inject colored liquid into one of the observation cavities 801 through the liquid inlet 9. The colored liquid reaches all the observation cavities 801 after passing through the communication cavity 802. Then, coaxially install the detection bowl 4 on the sleeve body 1 through the shock-absorbing ring 14, the upper collar 11, and the lower collar 12. In the initial state, the axes of both the sleeve body 1 and the detection bowl 4 are perpendicular to the ground.

[0036] During the drilling construction process, the vibration of the rotary drilling rig is transmitted to the sleeve body 1. The vibration received by the sleeve body 1 is transmitted to the upper collar 11 and the lower collar 12 after being shock-absorbed by the shock-absorbing ring 14. The vibration received by the upper collar 11 and the lower collar 12 is transmitted to the detection bowl 4 after being shock-absorbed by the buffer pad 13, so that the vibration received inside the detection bowl 4 is small. And according to the characteristic that the liquid can quickly recover, even if affected by vibration, the verticality of the sleeve body 1 can be accurately judged at any time.

[0037] When the verticality of the sleeve body 1 changes, according to the principle of the communicating vessel, the liquid surfaces in all the observation cavities 801 as a whole still remain parallel to the ground. When the sleeve body 1 drives the detection bowl 4 to tilt, the position of the liquid surface in the downward-tilted side of the detection bowl 4 on the scale line 5 will rise, while the position of the liquid surface in the upward-tilted side of the detection bowl 4 on the scale line 5 will fall, thus generating a scale difference, which can facilitate the judgment of the verticality change of the sleeve body 1.

[0038] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Based on the technical essence of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments within the spirit and principle of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A casing for a bored secant pile used in foundation pit retaining construction, characterized in that: It includes an optical detection part and a casing body (1). The optical detection part includes a collar (3), a detection bowl (4) for containing a colored liquid and having scale lines (5), an optical sensor (6) for collecting the position information of the liquid level of the colored liquid on the scale lines (5), a controller, and an alarm. The collar (3) is provided at the top of the outer wall of the casing body (1). The collar (3) and the detection bowl (4) are both coaxially arranged with the casing body (1). The optical sensor (6) and the detection bowl (4) are sequentially arranged on the outer wall of the collar (3) from top to bottom. The detection bowl (4) includes a transparent top plate (401) and a light-shielding bottom plate (402) sequentially arranged from top to bottom. A liquid cavity (8) for containing the colored liquid is left between the transparent top plate (401) and the light-shielding bottom plate (402). The scale lines (5) are provided on the top surface of the transparent top plate (401). The scale values on the scale lines (5) gradually increase or gradually decrease along the radial direction of the casing body (1). At least four groups of the optical sensors (6) are evenly distributed in a ring on the collar (3), and all the optical sensors (6) are centrally symmetrically distributed around the casing body (1). The controller is electrically connected to all the optical sensors (6), and the controller is electrically connected to an alarm for giving an alarm reminder. The controller is used to process the image information collected by the optical sensors (6). Taking each piece of image information collected by the optical sensors (6) as instant image information, taking the changing direction of the scale value of the scale lines (5) in the instant image information as the up-down direction, and taking the scale value where the liquid surface point (b) on the symmetry line (a) in the left-right direction in the instant image information is located as the liquid surface value; Dividing the sum of all the liquid surface values obtained within a predetermined fixed time period by the number of instant image information within the predetermined fixed time period to obtain the liquid surface average value of the optical sensor (6); Subtracting the liquid surface average values obtained by every two symmetrically arranged optical sensors (6) on both sides of the casing body (1) and taking the absolute value of the difference, and taking the largest value among all the absolute values after subtraction as the tilt extreme value; Comparing the tilt extreme value with a preset tilt threshold, and when the tilt extreme value is greater than the tilt threshold, sending an alarm message to the alarm for giving an alarm reminder.

2. The casing of the secant bored pile for foundation pit retaining construction according to claim 1, characterized in that: At least four mounting brackets (7) for mounting the optical sensors (6) are evenly distributed around the casing body (1) on the collar (3), and at least one group of optical sensors (6) is provided on each mounting bracket (7).

3. A casing for a drilled secant pile for foundation pit retaining construction according to claim 1, characterized in that: Both the transparent top plate (401) and the light-shielding bottom plate (402) are in the shape of a concave conical surface surrounding the casing body (1), and a liquid inlet (9) for communicating with the liquid cavity (8) is provided at the top of the transparent top plate (401).

4. A casing for a drilled secant pile used in foundation pit retaining construction according to claim 3, characterized in that: A plurality of partition strips (10) are evenly distributed in a ring around the casing body (1) in the liquid cavity (8). An observation cavity (801) for allowing the colored liquid to flow in is left between every two adjacent partition strips (10). The upper and lower surfaces of each partition strip (10) are respectively hermetically connected to the bottom surface of the transparent top plate (41) and the top surface of the light-shielding bottom plate (402). The liquid cavity (8) further includes a communication cavity (802) provided at the bottom of the liquid cavity (8) for communicating all the observation cavities (801).

5. A casing for a drilled secant pile for foundation pit retaining construction according to claim 4, characterized in that: The scale lines (5) are concentric multiple circular rings with the center of the circle located on the axis of the sleeve body (1) and the diameter gradually expanding from the inside to the outside. The extending direction of the observation cavity (801) is perpendicular to the scale lines (5).

6. A casing for a bored secant pile used in foundation pit retaining construction according to claim 1, characterized in that: The detection bowl (4) further includes a mounting ring (403). The inner walls of the transparent top plate (401) and the light-shielding bottom plate (402) are both connected to the outer wall of the mounting ring (403). The mounting ring (403) is a circular ring coaxially arranged with the sleeve body (1). The collar (3) includes an upper collar (11) nested on the top end of the mounting ring (403) and a lower collar (12) nested on the bottom end of the mounting ring (403).

7. A casing for a drilled secant pile used in foundation pit retaining construction according to claim 6, characterized in that: Buffer pads (13) are provided between the upper collar (11) and the mounting ring (403) and between the lower collar (12) and the mounting ring (403).

8. A casing for a bored secant pile used in foundation pit retaining construction according to claim 6, characterized in that: The collar (3) further includes a shock-absorbing ring (14) for directly contacting the sleeve body (1). Bolts passing through the collar (3) and threadedly connected to the sleeve body (1) are provided on both the upper collar (11) and the lower collar (12).

9. A method for detecting the inclination of the casing of a drilled overlapping pile for foundation pit enclosure construction, characterized in that: Applied to a bored secant pile sleeve for foundation pit retaining construction according to any one of claims 1-8, the following steps are included: Step S1: Collect image information including the liquid level and the scale lines (5) at corresponding positions through the optical sensor (6). Step S2: Taking each piece of image information collected by the optical sensor (6) as instant image information, taking the changing direction of the measured value of the scale lines (5) in the instant image information as the up and down direction, and taking the measured value of the scale at the liquid level point (b) on the symmetry line (a) in the left and right direction in the instant image information as the liquid level value. Step S3: Divide the sum of all the liquid level values obtained within a predetermined fixed time period by the number of instant image information within the predetermined fixed time period to obtain the average liquid level obtained by the optical sensor. Step S4: Subtract the average liquid levels obtained by two symmetrically arranged optical sensors (6) on both sides of the sleeve body (1) and take the absolute value of the difference. Take the maximum value among all the absolute values after subtraction as the inclination extreme value. Step S5: Compare the inclination extreme value with a preset inclination threshold. When the inclination extreme value is greater than the inclination threshold, send an alarm message to the alarm for alarm reminder.

10. A method for detecting the inclination of the casing of a drilled secant pile for foundation pit retaining construction according to claim 9, characterized in that: The optical sensor (6) uses a camera. In step S2, take the rounded-up scale value or the rounded-down scale value of the liquid level point (b) on the symmetry line (a) in the left and right direction in the instant image information collected by the camera, or take the average value of the two adjacent scale values of the liquid level point (b) as the corresponding liquid level value.

Images