Automatic pouring maintenance method for large-diameter shield segment

Abstract

The invention discloses an automatic pouring and maintaining method for a large-diameter shield segment, and belongs to the technical field of prefabricated segments. The automatic pouring and maintaining method comprises the following steps that a mold device is installed; controlling the arc-shaped frame to rotate upwards so as to form an operation space above the mold; the segment reinforcement cage is hoisted into a cavity of the mold through a hoisting tool; the arc-shaped frame is controlled to rotate downwards and abut against the top face of the mold, the top mold plate is moved backwards by a preset distance along the arc-shaped frame so that a concrete pouring opening can be formed in the upper portion of the mold, and concrete is discharged into the mold through a concrete pouring device on the upper portion of the mold; after pouring is completed, the top formwork slides out of the mold along the arc-shaped frame; and the automatic plastering sliding mechanism is driven to preliminarily plaster concrete on the surface of the top of the mold. The automatic pouring and maintaining method has the advantages that automatic pouring and mechanical plastering can be achieved by means of the mold device, traditional manual plastering is replaced, and the working efficiency and the plastering quality are greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of prefabricated pipe segments, and in particular relates to an automated casting and curing method for large-diameter shield pipe segments. Background Art

[0002] The shield segment is an important component used for lining the tunnel in shield tunnel construction, or an important component used for lining the inner wall of the vertical shaft in the construction of a vertical underground garage. Its quality directly affects the safety and service life of the tunnel or the vertical underground garage.

[0003] In the traditional large-diameter shield segment production process, the segments need to be manually plastered during the maintenance process to fill the pores, cracks, defects, protrusions and other defects on the segment surface and improve the flatness and smoothness of the segment surface. However, manual plastering has the following shortcomings: (1) Low efficiency: Manual plastering is slow and cannot meet the needs of large-scale production. (2) Unstable quality: The quality of manual plastering is greatly affected by the workers' technical level, and it is easy to have problems such as uneven plastering and missing plastering. (3) High labor intensity: Manual plastering requires workers to bend over for a long time, which is labor-intensive and easily causes worker fatigue.

[0004] Based on the above shortcomings, there is an urgent need for a casting and maintenance method that can realize automated plastering of large-diameter shield segments. Summary of the invention

[0005] The purpose of the present invention is to provide an automated casting and maintenance method for large-diameter shield segments in light of the deficiencies in the above-mentioned prior art. The automated casting and maintenance method comprises the following steps: an automatic plastering mechanism is arranged above the mold; under the guidance and drive of a motor drive mechanism and a fixed pulley mechanism, the automatic plastering sliding mechanism can be longitudinally moved along the longitudinal upper guide groove on the arc frame to perform plastering, and the top mold plate can be longitudinally moved along the longitudinal lower guide groove on the arc frame to switch between different positions at different casting stages.

[0006] The purpose of the present invention is achieved by the following technical solutions: An automated pouring and curing method for a large-diameter shield segment comprises the following steps: S1: Installing a mold device; the mold device includes a base, a mold and an automatic finishing mechanism; the mold is arranged on the base and supported by a bracket on the base; The mold comprises a bottom mold plate, two side mold plates, two end mold plates and a top mold plate; The number of the automatic plastering mechanism is two groups and they are symmetrically arranged with the center line of the mold as the symmetry axis; the automatic plastering mechanism comprises an arc frame, an automatic plastering sliding mechanism, a fixed pulley mechanism and a motor drive mechanism; wherein: The front part of the arc frame is arranged above the mold, and the rear part of the arc frame extends outward and is hinged to the base through the support feet; the top mold plate and the arc frame are assembled in a sliding manner, and the top mold plate slides longitudinally along the arc frame; The automatic plastering sliding mechanism comprises a guide bracket, a sliding cross bar and a plastering panel mechanism, wherein the guide bracket is fixedly arranged above the front area of ​​the arc-shaped frame, the two ends of the sliding cross bar are slidably assembled on the longitudinal bar of the guide bracket, and the plastering panel mechanism is fixedly arranged below the sliding cross bar and moves longitudinally with the sliding cross bar; The fixed pulley mechanism is fixedly arranged on the base and close to the support foot position at the rear of the arc-shaped frame; The motor drive mechanism comprises a motor fixing frame, a driving motor, a cam plate, a first connecting rod and a second connecting rod, wherein the motor fixing frame is fixedly arranged at the rear area of ​​the arc-shaped frame, the driving motor is fixedly mounted on the motor fixing frame, the rotation center of the cam plate is driven to rotate by the driving motor, one end of the first connecting rod is fixed at the rotation center position of the cam plate, the other end of the first connecting rod is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the upper part of the wiping panel mechanism to push the wiping panel mechanism and the sliding cross bar to make longitudinal reciprocating sliding; S2: The arc frame is rotated upward by the motor drive mechanism and the fixed pulley mechanism to form a working space above the mold; the segment reinforcement cage is hoisted into the cavity of the mold by a hoist and each embedded part is installed and fixed; S3: controlling the arc frame to rotate downward and abut against the top surface of the mold through the motor drive mechanism and the fixed pulley mechanism, moving the top template backward along the arc frame by a preset distance to clear a concrete pouring port above the mold, and pouring concrete into the cavity of the mold through a concrete pouring device above the mold, and continuously vibrating the concrete; S4: After the concrete pouring in the mold is completed, the top template is slid from above the mold along the arc frame to outside the mold; the motor drive mechanism and the fixed pulley mechanism drive the automatic finishing sliding mechanism to preliminarily finish the concrete on the top surface of the mold; after the preliminary finishing, the concrete is immediately covered with a plastic sheet for rest; S5: During the curing period, the outer arc surface of the tube segment in the mold is secondarily plastered, and after completion, the plastic sheet is again covered for curing.

[0007] The guide bracket is arranged on both sides of the arc frame, and the guide bracket includes vertical rods arranged at the front end and the rear end of the mold and the longitudinal rod arranged between the two vertical rods. Sliding sleeves are respectively arranged at both ends of the sliding cross bar and the sliding sleeves are sleeved on the longitudinal rod to form a sliding assembly relationship; the wiping panel mechanism includes a telescopic sleeve and a wiping panel, the telescopic sleeve includes an upper sleeve fixed on the sliding cross bar and a lower sleeve sleeved on the upper sleeve, a telescopic spring is arranged between the upper sleeve and the lower sleeve, guide wheels are arranged on both sides of the bottom of the wiping panel, and a conical scraper for wiping the surface is arranged at the bottom of the wiping panel.

[0008] The front arc surface of the arc frame is matched and fits with the arc surface of the mold; the arc frame is composed of arc-shaped longitudinal bars on both sides and cross bars at both ends, and two upper and lower longitudinal guide grooves are arranged on the inner wall surface of the arc-shaped longitudinal bars, which are the upper longitudinal guide groove and the lower longitudinal guide groove respectively; wherein, the guide wheels on both sides of the bottom of the wiping panel are correspondingly assembled in the upper longitudinal guide groove, and the two side edges of the top template of the mold are correspondingly assembled in the lower longitudinal guide groove to realize longitudinal sliding in the arc frame.

[0009] A rear cross bar is arranged in the rear area of ​​the arc-shaped frame, and the motor fixing frame includes two fixing frame columns and a fixing frame longitudinal rod, the two fixing frame columns are respectively fixed on the rear cross bar and the cross bar at the rear end, and the two ends of the fixing frame longitudinal rod are fixedly connected to the two fixing frame columns.

[0010] The fixed pulley mechanism comprises a pillar and a fixed pulley fixedly arranged on the top of the pillar, the cam plate is arranged above the fixed pulley and supported and guided by the fixed pulley; the cam plate comprises a small diameter arc segment, a large diameter arc segment and a smooth segment connecting the two; In step S2, the method for rotating the arc frame upward by the motor drive mechanism and the fixed pulley mechanism is: controlling the cam plate to rotate clockwise, and under the guidance of the fixed pulley, when the cam plate rotates from the small diameter arc segment to the smooth segment, the arc frame rotates upward with the hinge point with the support leg as the rotation center; In step S3, the method of controlling the arc frame to rotate downward and abut against the top surface of the mold by the motor drive mechanism and the fixed pulley mechanism is as follows: controlling the cam plate to rotate counterclockwise, and under the guidance of the fixed pulley, the cam plate rotates from the smooth section to the small diameter arc section, and the arc frame rotates downward with the hinge point with the support leg as the rotation center until it abuts against the top surface of the mold; In step S4: the method of driving the automatic plastering sliding mechanism to perform preliminary plastering on the concrete on the top surface of the mold by the motor drive mechanism and the fixed pulley mechanism is as follows: the cam plate is controlled to rotate clockwise, the small diameter arc segment on the cam plate rotates under the guidance of the fixed pulley, the first connecting rod and the second connecting rod on the cam plate drive the plastering panel mechanism to retreat, and the conical scraper at the bottom of the plastering panel mechanism performs preliminary plastering on the concrete surface in the mold.

[0011] The advantages of the present invention are: (1) The automated pouring and curing method can realize automated pouring and mechanical plastering with the help of a mold device, replacing traditional manual plastering, which greatly improves work efficiency and plastering quality; (2) With the cooperation of the fixed pulley mechanism and the motor drive mechanism, the arc frame has two working postures, that is, it can be set in close contact with the top of the mold, or it can be rotated upward to detach from the mold surface to provide working space for operations such as concrete pouring and demoulding; (3) The longitudinal upper and lower guide grooves of the arc frame can reasonably allocate the sliding space of the screed mechanism and the top formwork to adapt to the changes in the casting state of the pipe segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an overall side view of the mold device of the large-diameter shield segment in the present invention; Figure 2 It is a partial side view of the mold device in the present invention in working state I; Figure 3 It is a partial side view of the mold device in the present invention in working state II; Figure 4 It is a partial side view of the mold device in the present invention in working state III; Figure 5 It is a partial side view of the arc frame and the wiping panel mechanism in the present invention; Figure 6 It is an overall plan view of the mold device of the large-diameter shield segment in the present invention; Figure 7 It is a partial plan view of the mold device of the large-diameter shield segment in the present invention.

[0013] like Figure 1-7 , the marks in the figure are: Mould 1, top mould plate 11; Base 2, bracket 21; Automatic plastering mechanism 3, arc frame 31, automatic plastering sliding mechanism 32, vertical rod 321, longitudinal rod 322, sliding sleeve 323, telescopic sleeve 324, plastering panel 325, guide wheel 326, conical scraper 327, sliding cross bar 328, fixed pulley mechanism 33, pillar 331, fixed pulley 332, motor drive mechanism 34, cam plate 341, first connecting rod 342, second connecting rod 343, motor fixing bracket 344, drive motor 345, support foot 35. DETAILED DESCRIPTION

[0014] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: Example: Figure 1 , 2 As shown in , 3, 4, 5, 6, and 7, this embodiment specifically relates to an automated pouring and curing method for a large-diameter shield segment, and the automated pouring and curing method comprises the following steps: (S1) Installing a mold device; like Figure 1 , 2 As shown in Figures , 3, 4, 5, 6 and 7, the mold device in this embodiment includes a base 2, a mold 1 and an automatic wiping mechanism 3.

[0015] The base 2 is arranged on the floor of the production workshop, and a plurality of brackets 21 are arranged at intervals in the central area thereof to support the arc-shaped mold 1. The mold 1 of the large-diameter shield segment includes a bottom mold, two side molds, two end molds and a top mold 11, which are assembled together to form a casting cavity for the large-diameter shield segment.

[0016] like Figure 1 , 2 As shown in , 3, 4, 5, 6, and 7, the number of automatic plastering mechanisms 3 is two groups and they are symmetrically arranged with the center line of the mold 1 as the symmetry axis. Taking the automatic plastering mechanism 3 on one side as an example, the automatic plastering mechanism 3 includes an arc frame 31, an automatic plastering sliding mechanism 32, a fixed pulley mechanism 33, and a motor drive mechanism 34.

[0017] like Figure 1 , 2As shown in Figures 3, 4, 5, 6 and 7, the overall length of the arc frame 31 is greater than 1 / 2 of the length of the mold 1, that is, the front portion of the arc frame 31 is arranged above the mold 1 and adopts the same arc surface size to form a mutual fit, and the rear portion of the arc frame 31 extends outward and is hinged to the base 2 through the support legs 35. Under the action of the arc frame 31 and the support legs 35 for hinged connection, the arc frame 31 can freely select a working posture, that is, the front portion of the arc frame 31 can be arranged in a close fit on the top of the mold 1, or it can be rotated upward with the hinge point of the support legs 35 as the rotation center under the action of the motor drive mechanism 34 and the fixed pulley mechanism 33.

[0018] like Figure 1 , 2 As shown in Figures 3, 4, 5, 6 and 7, the automatic wiping sliding mechanism 32 includes a guide bracket, a sliding cross bar 328 and a wiping panel mechanism; wherein the guide bracket is fixedly arranged above the front area of ​​the arc frame 31, and the guide bracket is used to provide guidance for the sliding of the sliding cross bar 328, so it is necessary to ensure that the covering area is larger than half of the area of ​​the mold 1; the guide bracket is arranged on both sides of the arc frame 31, and the guide bracket includes a vertical rod 321 arranged at the front and rear ends of the mold 1 and a longitudinal rod 322 arranged between the two vertical rods 321, and sliding sleeves 323 are respectively arranged at both ends of the sliding cross bar 328, and the sliding sleeves 323 are mounted on the longitudinal rod 322 to form a sliding assembly relationship. The wiping panel mechanism is fixedly arranged below the sliding cross bar 328 and moves longitudinally with the sliding cross bar 328; the wiping panel mechanism includes a telescopic sleeve 324 and a wiping panel 325, the telescopic sleeve 324 includes an upper sleeve fixed on the sliding cross bar 328 and a lower sleeve sleeved on the upper sleeve, a telescopic spring is arranged between the upper sleeve and the lower sleeve, guide wheels 326 are arranged on both sides of the bottom of the wiping panel 325, and a conical scraper 327 is arranged at the bottom of the wiping panel 325. It should be noted that, since the arc frame 31 is in an arc shape that matches the mold 1, in the process of moving with the sliding cross bar 328, the wiping panel 325 and its conical scraper 327 should also adapt to the change of the arc to ensure that it is always in contact with the top surface of the mold 1 for wiping, and the telescopic spring in the telescopic sleeve 324 can ensure that the conical scraper 327 can always be in contact with the top surface of the mold 1.

[0019] like Figure 1 , 2As shown in Figures 5, 6, and 7, the arc frame 31 is composed of arc longitudinal bars on both sides and cross bars at both ends. The inner wall surface of the arc longitudinal bars is provided with two upper and lower longitudinal guide grooves, namely the upper longitudinal guide groove 311 and the lower longitudinal guide groove 312; wherein, the guide wheels 326 on both sides of the bottom of the plastering panel 325 are correspondingly assembled in the upper longitudinal guide groove 311, and the two side edges of the top template 11 of the mold 1 are correspondingly assembled in the lower longitudinal guide groove 312 to achieve longitudinal sliding in the arc frame 31. During the concrete pouring stage, the top template 11 can be slid to the front area of ​​the arc frame 31 to close the mold 1; when the pouring is completed and plastering is required, the top template 11 can be slid to the rear area of ​​the arc frame 31 to facilitate the plastering operation of the plastering panel 325.

[0020] like Figure 1 , 2 As shown in Figures 3, 4, 5, 6 and 7, the fixed pulley mechanism 33 is fixedly arranged on the base 2 and close to the support foot 35 at the rear of the arc frame 31. The fixed pulley mechanism 33 includes a pillar 331 and a fixed pulley 332 fixedly arranged on the top of the pillar 331.

[0021] like Figure 1 , 2 As shown in Figures 3, 4, 5, 6 and 7, the motor drive mechanism 34 includes a motor fixing frame 344, a driving motor 345, a cam plate 341, a first connecting rod 342 and a second connecting rod 343. The motor fixing frame 344 is fixedly arranged in the rear area of ​​the arc frame 31, the driving motor 345 is fixedly installed on the motor fixing frame 344, the rotation center of the cam plate 341 is driven to rotate by the driving motor 345, one end of the first connecting rod 342 is fixed at the rotation center position of the cam plate 341, the other end of the first connecting rod 342 is hinged to one end of the second connecting rod 343, and the other end of the second connecting rod 343 is hinged to the upper telescopic sleeve 324 of the wiping panel mechanism to push the wiping panel mechanism and the sliding cross bar 328 to slide back and forth longitudinally. It should be noted that the end of the first connecting rod 342 is fixedly connected to the cam plate 341 and rotates synchronously therewith. A rear cross bar is arranged in the rear area of ​​the arc frame 31, and the motor fixing frame 344 includes two fixing frame columns and a fixing frame longitudinal rod. The two fixing frame columns are respectively fixed on the rear cross bar and the cross bar at the rear end, and the two ends of the fixing frame longitudinal rod are fixedly connected to the two fixing frame columns.

[0022] like Figure 1 , 2 As shown in , 3, 4, 5, 6, and 7, the cam plate 341 is disposed above the fixed pulley 332 and supported and guided by the fixed pulley; wherein the cam plate 341 includes a small diameter arc segment, a large diameter arc segment, and a smooth segment connecting the two; Figure 2 , 3As shown, in the case of clockwise rotation, the small diameter arc segment drives the wiping panel mechanism to retreat through the first connecting rod 342 and the second connecting rod 343; Figure 3 , 4 As shown, the smooth section drives the entire arc frame 31 to rotate upward through the support of the fixed pulley 332, and the large-diameter arc section drives the wiping panel mechanism to push forward through the first connecting rod 342 and the second connecting rod 343.

[0023] In addition, a high-frequency vibration mechanism (not shown in the figure) is arranged on the base 2, and the high-frequency vibration mechanism is in contact with the bottom surface of the mold 1 to transmit vibration.

[0024] (S2) The arc frame 31 is rotated upward by the motor drive mechanism 34 and the fixed pulley mechanism 33 to form a working space above the mold 1; the segment reinforcement cage is hoisted into the cavity of the mold 1 by the hoisting device and the embedded parts are installed and fixed; the specific method of rotating the arc frame 31 upward is: The cam plate 341 is controlled to rotate clockwise. Under the guidance of the fixed pulley 332, when the cam plate 341 rotates from the small diameter arc section to the smooth section, the cam plate 341 drives the arc frame 31 to rotate upward with the hinge point of the support leg 35 as the rotation center through the driving motor 345 and the motor fixing bracket 344.

[0025] (S3) The arc frame 31 is controlled to rotate downward and abut against the top surface of the mold 1 by the motor drive mechanism 34 and the fixed pulley mechanism 33, and the top mold plate 11 is moved backward along the arc frame 31 by a preset distance to clear a concrete pouring port above the mold 1, and concrete is poured into the cavity of the mold 1 by the concrete pouring device above the mold 1, and continuous vibration is performed. The specific method of rotating the arc frame 31 downward is: The cam plate 341 is controlled to rotate counterclockwise. Under the guidance of the fixed pulley 332, the cam plate 341 rotates from the smooth section to the small diameter arc section. The cam plate 341 drives the arc frame 31 to rotate downward with the hinge point of the support leg 35 as the rotation center through the driving motor 345 and the motor fixing bracket 344 until it is close to the top surface of the mold 1.

[0026] (S4) After the concrete pouring in the mold 1 is completed, the top mold plate 11 is slid from the top of the mold 1 along the arc frame 31 to the outside of the mold 1; the motor drive mechanism 34 and the fixed pulley mechanism 33 drive the automatic finishing sliding mechanism 32 to perform preliminary finishing on the concrete on the top surface of the mold 1. If the concrete is insufficient, add more concrete, and if the concrete is excessive, reduce the amount as necessary; after the preliminary finishing, cover it with plastic sheeting immediately for rest to prevent excessive evaporation of water from affecting cement hydration. The specific method of preliminary finishing is: The cam plate 341 is controlled to rotate clockwise, and the small diameter arc segment on the cam plate 341 rotates under the guidance of the fixed pulley 332. The first connecting rod and the second connecting rod on the cam plate 341 drive the panel plastering mechanism to retreat, and the conical scraper 327 at the bottom of the panel plastering mechanism performs preliminary plastering on the concrete surface in the mold 1.

[0027] (S5) During the curing period, the outer arc surface of the pipe segment in the mold is secondarily plastered according to the method in step S4, and after completion, the plastic sheet is again covered for curing.

[0028] The beneficial effects of this embodiment are: (1) The automated pouring and curing method can realize automated pouring and mechanical plastering with the help of a mold device, replacing traditional manual plastering, which greatly improves work efficiency and plastering quality; (2) With the cooperation of the fixed pulley mechanism and the motor drive mechanism, the arc frame has two working postures, that is, it can be set in close contact with the top of the mold, or it can be rotated upward to detach from the mold surface to provide working space for operations such as concrete pouring and demoulding; (3) The longitudinal upper and lower guide grooves of the arc frame can reasonably allocate the sliding space of the screed mechanism and the top formwork to adapt to the changes in the casting state of the pipe segment.

Claims

1. An automated casting and curing method for large-diameter shield segments, characterized in that The automated pouring and curing method comprises the following steps: S1: Installing a mold device; the mold device includes a base, a mold and an automatic finishing mechanism; the mold is arranged on the base and supported by a bracket on the base; The mold comprises a bottom mold plate, two side mold plates, two end mold plates and a top mold plate; The number of the automatic plastering mechanism is two groups and they are symmetrically arranged with the center line of the mold as the symmetry axis; the automatic plastering mechanism comprises an arc frame, an automatic plastering sliding mechanism, a fixed pulley mechanism and a motor drive mechanism; wherein: The front part of the arc frame is arranged above the mold, and the rear part of the arc frame extends outward and is hinged to the base through the support feet; the top mold plate and the arc frame are assembled in a sliding manner, and the top mold plate slides longitudinally along the arc frame; The automatic plastering sliding mechanism comprises a guide bracket, a sliding cross bar and a plastering panel mechanism, wherein the guide bracket is fixedly arranged above the front area of ​​the arc-shaped frame, the two ends of the sliding cross bar are slidably assembled on the longitudinal bar of the guide bracket, and the plastering panel mechanism is fixedly arranged below the sliding cross bar and moves longitudinally with the sliding cross bar; The fixed pulley mechanism is fixedly arranged on the base and close to the support foot position at the rear of the arc-shaped frame; The motor drive mechanism comprises a motor fixing frame, a driving motor, a cam plate, a first connecting rod and a second connecting rod, wherein the motor fixing frame is fixedly arranged at the rear area of ​​the arc-shaped frame, the driving motor is fixedly mounted on the motor fixing frame, the rotation center of the cam plate is driven to rotate by the driving motor, one end of the first connecting rod is fixed at the rotation center position of the cam plate, the other end of the first connecting rod is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the upper part of the wiping panel mechanism to push the wiping panel mechanism and the sliding cross bar to make longitudinal reciprocating sliding; S2: The arc frame is rotated upward by the motor drive mechanism and the fixed pulley mechanism to form a working space above the mold; the segment reinforcement cage is hoisted into the cavity of the mold by a hoist and each embedded part is installed and fixed; S3: controlling the arc frame to rotate downward and abut against the top surface of the mold through the motor drive mechanism and the fixed pulley mechanism, moving the top template backward along the arc frame by a preset distance to clear a concrete pouring port above the mold, and pouring concrete into the cavity of the mold through a concrete pouring device above the mold, and continuously vibrating the concrete; S4: After the concrete pouring in the mold is completed, the top template is slid from above the mold along the arc frame to outside the mold; the motor drive mechanism and the fixed pulley mechanism drive the automatic finishing sliding mechanism to preliminarily finish the concrete on the top surface of the mold; after the preliminary finishing, the concrete is immediately covered with a plastic sheet for rest; S5: During the curing period, the outer arc surface of the tube segment in the mold is secondarily plastered, and after completion, the plastic sheet is again covered for curing.

2. The method for automatically casting and maintaining a large diameter shield segment according to claim 1, characterized in that The guide bracket is arranged on both sides of the arc frame, and the guide bracket includes vertical rods arranged at the front end and the rear end of the mold and the longitudinal rod arranged between the two vertical rods. Sliding sleeves are respectively arranged at both ends of the sliding cross bar and the sliding sleeves are sleeved on the longitudinal rod to form a sliding assembly relationship; the wiping panel mechanism includes a telescopic sleeve and a wiping panel, the telescopic sleeve includes an upper sleeve fixed on the sliding cross bar and a lower sleeve sleeved on the upper sleeve, a telescopic spring is arranged between the upper sleeve and the lower sleeve, guide wheels are arranged on both sides of the bottom of the wiping panel, and a conical scraper for wiping the surface is arranged at the bottom of the wiping panel.

3. The method for automatically casting and maintaining a large diameter shield segment according to claim 2, characterized in that The front arc surface of the arc frame is matched and fits with the arc surface of the mold; the arc frame is composed of arc-shaped longitudinal bars on both sides and cross bars at both ends, and two upper and lower longitudinal guide grooves are arranged on the inner wall surface of the arc-shaped longitudinal bars, which are the upper longitudinal guide groove and the lower longitudinal guide groove respectively; wherein, the guide wheels on both sides of the bottom of the wiping panel are correspondingly assembled in the upper longitudinal guide groove, and the two side edges of the top template of the mold are correspondingly assembled in the lower longitudinal guide groove to realize longitudinal sliding in the arc frame.

4. The method for automatically casting and maintaining a large diameter shield segment according to claim 3, characterized in that A rear cross bar is arranged in the rear area of ​​the arc-shaped frame, and the motor fixing frame includes two fixing frame columns and a fixing frame longitudinal rod, the two fixing frame columns are respectively fixed on the rear cross bar and the cross bar at the rear end, and the two ends of the fixing frame longitudinal rod are fixedly connected to the two fixing frame columns.

5. The method for automatically casting and maintaining a large diameter shield segment according to claim 4, characterized in that The fixed pulley mechanism comprises a pillar and a fixed pulley fixedly arranged on the top of the pillar, the cam plate is arranged above the fixed pulley and supported and guided by the fixed pulley; the cam plate comprises a small diameter arc segment, a large diameter arc segment and a smooth segment connecting the two; In step S2, the method for rotating the arc frame upward by the motor drive mechanism and the fixed pulley mechanism is: controlling the cam plate to rotate clockwise, and under the guidance of the fixed pulley, when the cam plate rotates from the small diameter arc segment to the smooth segment, the arc frame rotates upward with the hinge point with the support leg as the rotation center; In step S3, the method of controlling the arc frame to rotate downward and abut against the top surface of the mold by the motor drive mechanism and the fixed pulley mechanism is as follows: controlling the cam plate to rotate counterclockwise, and under the guidance of the fixed pulley, the cam plate rotates from the smooth section to the small diameter arc section, and the arc frame rotates downward with the hinge point with the support leg as the rotation center until it abuts against the top surface of the mold; In step S4: the method of driving the automatic plastering sliding mechanism to perform preliminary plastering on the concrete on the top surface of the mold by the motor drive mechanism and the fixed pulley mechanism is as follows: the cam plate is controlled to rotate clockwise, the small diameter arc segment on the cam plate rotates under the guidance of the fixed pulley, the first connecting rod and the second connecting rod on the cam plate drive the plastering panel mechanism to retreat, and the conical scraper at the bottom of the plastering panel mechanism performs preliminary plastering on the concrete surface in the mold.

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