An automated pouring and curing method for large-diameter shield segments

Abstract

The present invention discloses an automated pouring and curing method for large-diameter shield segments, belonging to the technical field of precast segments, and comprising the following steps: installing a mold device; controlling the upward rotation of an arc-shaped frame to form a working space above the mold; hoisting a segment reinforcement cage into the cavity of the mold by a lifting tool; controlling the downward rotation of the arc-shaped frame and making it abut against the top surface of the mold, moving a top formwork backward along the arc-shaped frame by a preset distance to leave a concrete pouring port above the mold, and discharging concrete into the mold through a concrete pouring device above the mold; after pouring is completed, sliding the top formwork along the arc-shaped frame outside the mold; driving an automatic surface finishing sliding mechanism to perform preliminary surface finishing on the concrete on the top surface of the mold. The advantages of the present invention are that the automated pouring and curing method can achieve automated pouring and mechanical surface finishing by means of the mold device, replacing traditional manual surface finishing, and there are significant improvements in both work efficiency and surface finishing quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of precast segments, and particularly relates to an automatic casting and curing method for large-diameter shield segments. Background Art

[0002] Shield segments are important components used for lining tunnels in shield tunneling construction or for lining the inner walls of vertical shafts in the construction of vertical underground garages, and their quality directly affects the safety and service life of tunnels or vertical underground garages.

[0003] In the traditional production process of large-diameter shield segments, during the curing process of the segments, manual plastering is required to fill the pores, cracks, defects, protrusions and other defects on the surface of the segments, and to improve the flatness and smoothness of the segment surface. However, manual plastering has the following deficiencies:

[0004] (1) Low efficiency: The speed of manual plastering is slow, making it difficult to meet the requirements of large-scale production. (2) Unstable quality: The quality of manual plastering is greatly affected by the technical level of workers, and problems such as uneven plastering and missed plastering are likely to occur. (3) High labor intensity: Manual plastering requires workers to bend down for a long time, with a high labor intensity and is prone to causing worker fatigue.

[0005] Based on the above deficiencies, there is an urgent need for a casting and curing method that can achieve automatic plastering of large-diameter shield segments. Summary of the Invention

[0006] The object of the present invention is to provide an automatic casting and curing method for large-diameter shield segments according to the deficiencies of the above-mentioned prior art. In this automatic casting and curing method, an automatic plastering mechanism is arranged above the mold. Under the guiding and driving of the motor driving mechanism and the fixed pulley mechanism, the automatic plastering sliding mechanism can perform longitudinal plastering along the longitudinal upper guide groove on the arc-shaped frame, and the top formwork can perform longitudinal movement along the longitudinal lower guide groove on the arc-shaped frame to switch to different positions at different casting stages.

[0007] The object of the present invention is achieved by the following technical solutions:

[0008] An automatic casting and curing method for large-diameter shield segments includes the following steps:

[0009] S1: Install the mold device; the mold device includes a base, a mold and an automatic plastering mechanism; the mold is arranged on the base and supported by the bracket on the base;

[0010] The mold includes a bottom formwork, two side formworks, two end formworks and a top formwork;

[0011] The number of the automatic screeding mechanisms is two and they are symmetrically arranged with the center line of the mold as the axis of symmetry; the automatic screeding mechanism includes an arc-shaped frame, an automatic screeding sliding mechanism, a fixed pulley mechanism and a motor driving mechanism; wherein:

[0012] The front part of the arc-shaped frame is arranged above the mold, and the rear part of the arc-shaped frame extends outward and is hinged to the base through a support leg; a sliding assembly is adopted between the top template and the arc-shaped frame, and the top template slides longitudinally along the arc-shaped frame;

[0013] The automatic screeding sliding mechanism includes a guiding bracket, a sliding cross bar and a screeding plate mechanism. The guiding 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 rods of the guiding bracket. The screeding plate mechanism is fixedly arranged below the sliding cross bar and longitudinally moves along with the sliding cross bar;

[0014] The fixed pulley mechanism is fixedly arranged on the base and close to the position of the support leg at the rear part of the arc-shaped frame;

[0015] The motor driving mechanism includes a motor fixing frame, a driving motor, a cam disc, a first connecting rod and a second connecting rod. The motor fixing frame is fixedly arranged in the rear area of the arc-shaped frame. The driving motor is fixedly installed on the motor fixing frame. The rotation center of the cam disc 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 disc. The other end of the first connecting rod is hinged to one end of the second connecting rod. The other end of the second connecting rod is hinged to the upper part of the screeding plate mechanism to push the screeding plate mechanism and the sliding cross bar to make longitudinal reciprocating sliding;

[0016] S2: The arc-shaped frame is rotated upward through the motor driving mechanism and the fixed pulley mechanism to form an operating space above the mold; the segment reinforcement cage is hoisted into the cavity of the mold through a hoisting tool and various embedded parts are installed and fixed;

[0017] S3: The arc-shaped frame is controlled to rotate downward and lean against the top surface of the mold through the motor driving mechanism and the fixed pulley mechanism. The top template is moved backward along the arc-shaped frame by a preset distance to vacate a concrete pouring port above the mold. Concrete is fed into the cavity of the mold through a concrete pouring device above the mold and continuous vibration is carried out;

[0018] S4: After the concrete in the mold is poured, slide the top formwork from above the mold along the arc-shaped frame to outside the mold; drive the automatic screeding sliding mechanism by the motor drive mechanism and the fixed pulley mechanism to perform preliminary screeding on the concrete on the top surface of the mold; immediately cover with a plastic sheet for curing after preliminary screeding;

[0019] S5: During curing, perform secondary screeding on the outer arc surface of the segment in the mold, and cover with a plastic sheet again for curing after completion.

[0020] The guiding brackets are respectively arranged on both sides of the arc-shaped frame. The guiding bracket includes vertical rods arranged at the front end and the rear end of the mold and a longitudinal rod arranged between the two vertical rods. Both ends of the sliding cross bar are respectively provided with sliding sleeves, and the sliding sleeves are sleeved on the longitudinal rod to form a sliding assembly relationship; the screeding plate mechanism includes a telescopic sleeve and a screeding plate. 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 screeding plate, and a conical scraping plate for screeding is arranged at the bottom of the screeding plate.

[0021] The front arc surface of the arc-shaped frame is adapted and fitted to the arc surface of the mold; the arc-shaped frame is composed of arc-shaped longitudinal rods on both sides and cross bars at both ends. Two longitudinal guide grooves, namely the upper longitudinal guide groove and the lower longitudinal guide groove, are arranged on the inner side wall surface of the arc-shaped longitudinal rod; wherein, the guide wheels on both sides of the bottom of the screeding plate are correspondingly assembled in the upper longitudinal guide groove, and the two side edges of the top formwork of the mold are correspondingly assembled in the lower longitudinal guide groove to realize longitudinal sliding in the arc-shaped frame.

[0022] A rear cross bar is arranged in the rear area of the arc-shaped frame. 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 both ends of the fixing frame longitudinal rod are fixedly connected to the two fixing frame columns.

[0023] The fixed pulley mechanism includes a support column and a fixed pulley fixedly arranged at the top of the support column. The cam disc is arranged above the fixed pulley and is supported and guided by the fixed pulley; the cam disc includes a small-diameter arc section, a large-diameter arc section, and a smooth section connecting the two;

[0024] In step S2, the method of rotating the arc-shaped frame upward by the motor drive mechanism and the fixed pulley mechanism is: control the cam disc to rotate clockwise. Under the guidance of the fixed pulley, when the cam disc rotates from the small-diameter arc section to the smooth section, the arc-shaped frame rotates upward with the hinge point with the support foot as the rotation center;

[0025] 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;

[0026] 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.

[0027] The advantages of the present invention are:

[0028] (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;

[0029] (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;

[0030] (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

[0031] Figure 1 It is an overall side view of the mold device of the large-diameter shield segment in the present invention;

[0032] Figure 2 It is a partial side view of the mold device in the present invention in working state I;

[0033] Figure 3 It is a partial side view of the mold device in the present invention in working state II;

[0034] Figure 4 It is a partial side view of the mold device in the present invention in working state III;

[0035] Figure 5 It is a partial side view of the arc frame and the wiping panel mechanism in the present invention;

[0036] Figure 6 This is the overall plan view of the mold device for large-diameter shield segments in the present invention;

[0037] Figure 7 This is the partial plan view of the mold device for large-diameter shield segments in the present invention.

[0038] As Figure 1-7 , the respective markings in the figure are:

[0039] Mold 1, top formwork 11;

[0040] Base 2, support 21;

[0041] Automatic finishing mechanism 3, arc-shaped frame 31, automatic finishing sliding mechanism 32, vertical rod 321, longitudinal rod 322, sliding sleeve 323, telescopic sleeve 324, finishing panel 325, guide wheel 326, conical scraping plate 327, sliding cross bar 328, fixed pulley mechanism 33, support column 331, fixed pulley 332, motor drive mechanism 34, cam disc 341, first connecting rod 342, second connecting rod 343, motor fixing frame 344, drive motor 345, support foot 35. Specific implementation mode

[0042] The features of the present invention and other related features are further described in detail below with reference to the accompanying drawings through embodiments for the understanding of those skilled in the same industry:

[0043] Embodiment: As Figure 1 , 2 , 3, 4, 5, 6, 7 show, this embodiment specifically relates to an automatic pouring and curing method for large-diameter shield segments, and this automatic pouring and curing method includes the following steps:

[0044] (S1) Install the mold device;

[0045] As Figure 1 , 2 , 3, 4, 5, 6, 7 show, the mold device in this embodiment includes a base 2, a mold 1, and an automatic finishing mechanism 3.

[0046] The base 2 is arranged on the floor of the production workshop, and a number of supports 21 are arranged at intervals in the central area thereof for supporting the arc-shaped mold 1. The mold 1 for large-diameter shield segments includes a bottom formwork, two side formworks, two end formworks, and a top formwork 11, which are assembled with each other to form a pouring cavity for large-diameter shield segments.

[0047] As Figure 1 , 2, as shown in Figures 3, 4, 5, 6, and 7, there are two sets of automatic plastering mechanisms 3, which are symmetrically arranged with the center line of the mold 1 as the axis of symmetry. Taking the automatic plastering mechanism 3 on one side as an example, the automatic plastering mechanism 3 includes an arc-shaped frame 31, an automatic plastering sliding mechanism 32, a fixed pulley mechanism 33, and a motor driving mechanism 34.

[0048] As Figure 1 , 2 , as shown in Figures 3, 4, 5, 6, and 7, the overall length of the arc-shaped frame 31 is greater than half of the length of the mold 1, that is, the front part of the arc-shaped frame 31 is arranged above the mold 1 and has the same arc surface size as it to form a mutual fit. The rear part of the arc-shaped frame 31 extends outward and is hinged to the base 2 through the support leg 35. Under the action of the arc-shaped frame 31 and the support leg 35 for hinging, the arc-shaped frame 31 can freely select the working posture, that is, the front part of the arc-shaped frame 31 can either be arranged in a fitting manner on the top of the mold 1 or rotate upward with the hinge point with the support leg 35 as the rotation center under the action of the motor driving mechanism 34 and the fixed pulley mechanism 33.

[0049] As Figure 1 , 2 , as shown in Figures 3, 4, 5, 6, and 7, the automatic plastering sliding mechanism 32 includes a guiding bracket, a sliding cross bar 328, and a plastering plate mechanism. Among them, the guiding bracket is fixedly arranged above the front area of the arc-shaped frame 31. The guiding bracket is used to provide guidance for the sliding of the sliding cross bar 328, so it needs to ensure that the covered area is greater than half of the area of the mold 1. The guiding brackets are arranged on both sides of the arc-shaped frame 31. The guiding bracket includes vertical rods 321 arranged at the front end and the rear end of the mold 1 and a longitudinal rod 322 arranged between the two vertical rods 321. Sliding sleeves 323 are respectively arranged at both ends of the sliding cross bar 328, and the sliding sleeves 323 are sleeved on the longitudinal rod 322 to form a sliding assembly relationship. The plastering plate mechanism is fixedly arranged below the sliding cross bar 328 and moves longitudinally with the sliding cross bar 328. The plastering plate mechanism includes a telescopic sleeve 324 and a plastering plate 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 plastering plate 325, and a conical scraping plate 327 is arranged at the bottom of the plastering plate 325. It should be noted that since the arc-shaped frame 31 is in an arc shape adapted to the mold 1, during the movement with the sliding cross bar 328, the plastering plate 325 and its conical scraping plate 327 also need to adapt to the arc change accordingly to ensure that they always fit on the top surface of the mold 1 for plastering. The telescopic spring in the telescopic sleeve 324 can ensure that the conical scraping plate 327 can always fit on the top surface of the mold 1.

[0050] As Figure 1 , 2As shown in Figures 5, 6, and 7, the arc-shaped frame 31 is composed of arc-shaped longitudinal bars on both sides and cross bars at both ends. On the inner side wall surface of the arc-shaped longitudinal bars, there are two longitudinal guide grooves, namely the upper longitudinal guide groove 311 and the lower longitudinal guide groove 312. Among them, the guide wheels 326 on both sides of the bottom of the plastering board 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-shaped frame 31. During the concrete pouring stage, the top template 11 can be slid to the front area of the arc-shaped 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-shaped frame 31 to facilitate the plastering operation of the plastering board 325.

[0051] As Figure 1 , 2 , Figures 3, 4, 5, 6, and 7 show that the fixed pulley mechanism 33 is fixedly arranged on the base 2 and near the position of the support leg 35 at the rear of the arc-shaped frame 31. The fixed pulley mechanism 33 includes a support column 331 and a fixed pulley 332 fixedly arranged at the top of the support column 331.

[0052] As Figure 1 , 2 , Figures 3, 4, 5, 6, and 7 show that the motor drive mechanism 34 includes a motor fixing frame 344, a drive motor 345, a cam disc 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-shaped frame 31. The drive motor 345 is fixedly installed on the motor fixing frame 344. The rotation center of the cam disc 341 is driven to rotate by the drive motor 345. One end of the first connecting rod 342 is fixed at the rotation center position of the cam disc 341. The other end of the first connecting rod 342 is hinged to one end of the second connecting rod 343. The other end of the second connecting rod 343 is hinged to the upper telescopic sleeve 324 of the plastering board mechanism to push the plastering board mechanism and the sliding cross bar 328 to perform longitudinal reciprocating sliding. It should be noted that the end of the first connecting rod 342 is fixedly connected to the cam disc 341 and rotates synchronously with it. There is a rear cross bar in the rear area of the arc-shaped frame 31. The motor fixing frame 344 includes two fixing frame columns and a fixing frame longitudinal bar. The two fixing frame columns are respectively fixed on the rear cross bar and the cross bar at the rear end. The two ends of the fixing frame longitudinal bar are fixedly connected to the two fixing frame columns.

[0053] As Figure 1 , 2 , Figures 3, 4, 5, 6, and 7 show that the cam disc 341 is arranged above the fixed pulley 332 and is supported and guided by the fixed pulley. Among them, the cam disc 341 includes a small-diameter arc segment, a large-diameter arc segment, and a smooth segment connecting the two. As Figure 2 , 3As shown, in the case of clockwise rotation, the small-diameter arc segment drives the plastering plate mechanism to retract through the first connecting rod 342 and the second connecting rod 343; as Figure 3 、 4 shown, the smooth segment drives the entire arc-shaped frame 31 to rotate upward through the support of the fixed pulley 332, and the large-diameter arc segment drives the plastering plate mechanism to push forward through the first connecting rod 342 and the second connecting rod 343.

[0054] In addition, a high-frequency vibration mechanism (not shown in the figure) is provided on the base 2, and the high-frequency vibration mechanism is in contact with the bottom surface of the mold 1 to conduct vibration.

[0055] (S2)Drive the arc-shaped frame 31 to rotate upward through the motor drive mechanism 34 and the fixed pulley mechanism 33 to form a working space above the mold 1; lift and place the segment reinforcement cage into the cavity of the mold 1 through a lifting tool and install and fix each embedded part; the specific method of rotating the arc-shaped frame 31 upward is:

[0056] Control the cam disc 341 to rotate clockwise. Under the guidance of the fixed pulley 332, when the cam disc 341 rotates from the small-diameter arc segment to the smooth segment, the cam disc 341 drives the arc-shaped frame 31 to rotate upward with the hinge point with the support leg 35 as the rotation center through the drive motor 345 and the motor fixing bracket 344.

[0057] (S3)Control the arc-shaped frame 31 to rotate downward and lean against the top surface of the mold 1 through the motor drive mechanism 34 and the fixed pulley mechanism 33, move the top formwork 11 backward along the arc-shaped frame 31 by a preset distance to vacate a concrete pouring port above the mold 1, and pour concrete into the cavity of the mold 1 through a concrete pouring device above the mold 1 and perform continuous vibration. The specific method of rotating the arc-shaped frame 31 downward is:

[0058] Control the cam disc 341 to rotate counterclockwise. Under the guidance of the fixed pulley 332, the cam disc 341 rotates from the smooth segment to the small-diameter arc segment, and the cam disc 341 drives the arc-shaped frame 31 to rotate downward with the hinge point with the support leg 35 as the rotation center until it leans against the top surface of the mold 1.

[0059] (S4)After the concrete in the mold 1 is poured, move the top formwork 11 from above the mold 1 along the arc-shaped frame 31 to the outside of the mold 1; drive the automatic plastering sliding mechanism 32 to perform preliminary plastering on the concrete surface at the top of the mold 1 through the motor drive mechanism 34 and the fixed pulley mechanism 33, add concrete if it is not enough, and reduce the amount if there is excess concrete; immediately cover with a plastic sheet for curing after preliminary plastering to prevent excessive evaporation of moisture from affecting the hydration of cement. The specific method of preliminary plastering is:

[0060] 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.

[0061] (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.

[0062] The beneficial effects of this embodiment are:

[0063] (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;

[0064] (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;

[0065] (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 automatic pouring and curing method for large-diameter shield segments, characterized in that The described automatic pouring and curing method includes the following steps: S1: Install the mold device; the mold device includes a base, a mold, and an automatic surface leveling mechanism; the mold is arranged on the base and supported by a bracket on the base; The mold includes a bottom template, two side templates, two end templates, and a top template; The number of the automatic surface leveling mechanisms is two and they are symmetrically arranged with the center line of the mold as the axis of symmetry; the automatic surface leveling mechanism includes an arc-shaped frame, an automatic surface leveling sliding mechanism, a fixed pulley mechanism, and a motor driving mechanism; where: The front part of the arc-shaped frame is arranged above the mold, and the rear part of the arc-shaped frame extends outward and is hinged to the base through a support leg; a sliding assembly is adopted between the top template and the arc-shaped frame, and the top template slides longitudinally along the arc-shaped frame; The automatic surface leveling sliding mechanism includes a guiding bracket, a sliding cross bar, and a surface leveling plate mechanism. The guiding 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 bars of the guiding bracket. The surface leveling plate mechanism is fixedly arranged below the sliding cross bar and moves longitudinally along with the sliding cross bar; The fixed pulley mechanism is fixedly arranged on the base and close to the position of the support leg at the rear of the arc-shaped frame; The motor driving mechanism includes a motor fixing frame, a driving motor, a cam disc, a first connecting rod, and a second connecting rod. The motor fixing frame is fixedly arranged in the rear area of the arc-shaped frame. The driving motor is fixedly installed on the motor fixing frame. The rotation center of the cam disc 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 disc. The other end of the first connecting rod is hinged to one end of the second connecting rod. The other end of the second connecting rod is hinged to the upper part of the surface leveling plate mechanism to push the surface leveling plate mechanism and the sliding cross bar to make longitudinal reciprocating sliding; The fixed pulley mechanism includes a support column and a fixed pulley fixedly arranged at the top of the support column. The cam disc is arranged above the fixed pulley and supported and guided by the fixed pulley; the cam disc includes a small-diameter arc section, a large-diameter arc section, and a smooth section connecting the two; S2: Rotate the arc-shaped frame upward through the motor driving mechanism and the fixed pulley mechanism to form a working space above the mold; lift and place the segment reinforcement cage into the cavity of the mold through a lifting tool and install and fix each embedded part; S3: Control the arc-shaped frame to rotate downward and lean against the top surface of the mold through the motor driving mechanism and the fixed pulley mechanism. Move the top template backward along the arc-shaped frame by a preset distance to leave a concrete pouring port above the mold. Pour concrete into the cavity of the mold through a concrete pouring device above the mold and carry out continuous vibration; S4: After the concrete in the mold is poured, slide the top formwork from above the mold along the arc-shaped frame to outside the mold; drive the automatic screeding sliding mechanism by the motor drive mechanism and the fixed pulley mechanism to perform preliminary screeding on the concrete on the top surface of the mold; immediately cover it with a plastic sheet for curing after the preliminary screeding; S5: During curing, perform secondary screeding on the outer arc surface of the segment in the mold, and cover it with a plastic sheet again for curing after completion.

2. The automated pouring and curing method for large-diameter shield segments according to claim 1, characterized in that The guiding brackets are respectively arranged on both sides of the arc-shaped frame. The guiding bracket includes vertical rods arranged at the front end and the rear end of the mold and longitudinal rods arranged between the two vertical rods. Both ends of the sliding cross bar are respectively provided with sliding sleeves, and the sliding sleeves are sleeved on the longitudinal rods to form a sliding assembly relationship; the screeding plate mechanism includes a telescopic sleeve and a screeding plate. 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 screeding plate, and a conical scraper for screeding is arranged at the bottom of the screeding plate.

3. The automated pouring and curing method for large-diameter shield segments according to claim 2, characterized in that The front arc surface of the arc-shaped frame is adapted and fitted to the arc surface of the mold; the arc-shaped frame is composed of arc-shaped longitudinal rods on both sides and cross bars at both ends. Two longitudinal guide grooves, namely a longitudinal upper guide groove and a longitudinal lower guide groove, are arranged on the inner side wall surface of the arc-shaped longitudinal rod; wherein, the guide wheels on both sides of the bottom of the screeding plate are correspondingly assembled in the longitudinal upper guide groove, and the two side edges of the top formwork of the mold are correspondingly assembled in the longitudinal lower guide groove to realize longitudinal sliding in the arc-shaped frame.

4. An automated pouring and curing method for large-diameter shield segments according to claim 3, characterized in that A rear cross bar is arranged in the rear area of the arc-shaped frame. 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 both ends of the fixing frame longitudinal rod are fixedly connected to the two fixing frame columns.

5. An automated casting and curing method for large-diameter shield segments according to claim 4, characterized in that In step S2, the method of rotating the arc-shaped frame upward by the motor drive mechanism and the fixed pulley mechanism is: control the cam disk to rotate clockwise. Under the guidance of the fixed pulley, when the cam disk rotates from the small-diameter arc segment to the smooth segment, the arc-shaped frame rotates upward with the hinge point with the support foot as the rotation center; In step S3, the method of controlling the arc-shaped frame to rotate downward and lean against the top surface of the mold by the motor drive mechanism and the fixed pulley mechanism is: control the cam disk to rotate counterclockwise. Under the guidance of the fixed pulley, the cam disk rotates from the smooth segment to the small-diameter arc segment, and the arc-shaped frame rotates downward with the hinge point with the support foot as the rotation center until it leans against the top surface of the mold; In step S4, the method of driving the automatic screeding sliding mechanism by the motor driving mechanism and the fixed pulley mechanism to perform preliminary screeding on the concrete surface at the top of the mold is as follows: control the cam disc to rotate clockwise, the small-diameter arc segment on the cam disc rotates under the guidance of the fixed pulley, the first connecting rod and the second connecting rod on the cam disc drive the screeding plate mechanism to retract, and the conical scraping plate at the bottom of the screeding plate mechanism performs preliminary screeding on the concrete surface in the mold.

Images