A method and positioning device for monitoring the verticality of thin-walled hollow pier casting

Abstract

The present invention discloses a method for monitoring the verticality of thin-walled hollow pier casting and a positioning device, comprising the following specific steps: S1, casting of the foundation; S2, hoisting and welding of the steel skeleton; S3, pre-pressing with sand, installing a blocking cross plate at the sand discharge window, and filling sand into the casting cavity between the inner and outer templates; S4, checking and adjusting the verticality of the template, and S5, discharging the sand filled in step S3, and pouring concrete. The method for monitoring the verticality of thin-walled hollow pier casting proposed by the present invention uses sand to pre-press the template system before pouring concrete, eliminates template gaps and elastic deformation, and makes the verticality detection more consistent with the actual situation after pouring concrete. The control accuracy is greatly improved compared to conventional methods, and verticality errors can be discovered in a timely manner. The template installation can be adjusted by discharging sand, reducing the loss of rework after concrete pouring, thereby improving the construction quality and progress of the bridge pier.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a method for monitoring the verticality of casting a thin-walled hollow pier and a positioning device. Background Art

[0002] In the construction of high bridges, thin-walled hollow piers are increasingly used. The terrain requires piers that are even more than 100 meters high. As the pier height increases, the construction error will become larger and larger, and the verticality is likely to exceed the critical value, which will affect the stability of the bridge and the pier. The factors affecting the verticality of the thin-walled hollow high pier body mainly include the following aspects: initial defects caused by construction errors, such as slight deviations in size, uneven materials leading to deviations in the verticality of the pier body, etc.; large-volume concrete pouring, formwork positioning offset and deformation, resulting in pier body displacement caused by its own load.

[0003] In the actual construction process, the pier body basically uses large-volume concrete and large formwork. It is very difficult to control the formwork because the volume of the formwork is very large. In addition to controlling the impact caused by external loads, the verticality of the pier body can ultimately be attributed to the control of the positioning accuracy of the construction formwork.

[0004] The verticality monitoring method adopted in the existing technology is to increase the number of verticality inspections before and after pouring so as to timely discover errors and make remedial adjustments. However, the verticality error of the formwork can be adjusted before pouring. Once the concrete is poured, the formwork is difficult to adjust, and the verticality of the pier column is already determined. If the error exceeds the critical value, it may even need to be chiseled out and reworked, which not only delays the construction period but also wastes manpower and material resources. Therefore, the study of verticality monitoring of thin-walled hollow pier casting is of great significance to improving the construction quality of bridges and enhancing the social and economic benefits of bridge projects. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a method and a positioning device for monitoring the verticality of the casting of thin-walled hollow piers.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for monitoring the verticality of a thin-walled hollow pier casting and a positioning device, the positioning device comprising an inner formwork, an outer formwork, a workbench, a casting false bottom, and a laser receiving target;

[0008] The inner and outer templates are fixedly attached to the surface of the thin-walled hollow pier body through tension rods, and a sand discharge window is reserved on the surface of the outer template;

[0009] The workbenches are fixedly mounted on the surfaces of the outer template and the inner template respectively, and the laser receiving target is fixedly mounted on the surface of the outer template;

[0010] The casting false bottom is installed in the casting cavity between the inner formwork and the outer formwork;

[0011] The method for monitoring the verticality of thin-walled hollow pier casting includes the following specific steps:

[0012] S1. For pouring the foundation, first build a cap on the ground, erect a formwork on the upper surface of the cap, and pour the foundation section under the pier body. Smooth out an inclined surface on the upper surface of the lower foundation section, and fix the inner and outer formwork on the surface of the lower foundation section to form the lower inner and outer formwork system;

[0013] S2, hoisting and welding of the steel skeleton. In step S1, a steel pile head is reserved on the upper surface of the lower foundation segment, and the steel skeleton and the steel pile head are welded;

[0014] S3, sand filling pre-compression, install a blocking horizontal plate at the sand discharge window, and fill sand into the casting cavity between the inner and outer templates;

[0015] S4. Check and adjust the template verticality. Use the laser total station to display the light spot on the laser receiving target and capture the spot center. Adjust the template so that the distance between the inner side of the outer template and the laser spot center is the same as the distance between the observation point and the pier body.

[0016] S5. Discharge the sand filled in step S3 and pour concrete.

[0017] Preferably, in step S1, the angle between the slope on the upper surface of the lower foundation section and the horizontal plane is 30°±10°. After the lower formwork system is installed, the elevation of the top surface of the lower formwork system and the center and plane dimensions of the pier body are checked with a level and a total station. If they meet the standards, the next process is carried out.

[0018] Preferably, during step S3, the lower formwork system is offset, and the inner formwork and outer formwork assembled on the upper surface of the lower formwork system form an upper formwork system. A casting false bottom is placed in the upper formwork system, and bolts are inserted on the outer side of the upper formwork system to fix the casting false bottom. A casting pipe that is connected through the upper and lower parts is provided on the upper surface of the casting false bottom. Sand is filled on the casting false bottom for pre-compression to adjust the position of the lower formwork system.

[0019] Preferably, during step S4, by loosening the tension rods between the inner and outer templates, or / and discharging sand in the lower template system, or / and adding sand to the lower template system, the position of the laser receiving target is adjusted so that the verticality of the inner and outer templates meets the requirements, and steel pipes arranged in a crisscross pattern are added to the surfaces of the inner and outer templates for bundling and fixing.

[0020] Preferably, during step S5, the laser receiving target in step S4 is used to display the light spot and capture the spot center to perform verticality monitoring and verification.

[0021] The present invention has the following beneficial effects:

[0022] 1. The method for monitoring the verticality of thin-walled hollow pier casting proposed in the present invention uses sand to pre-press the formwork system before pouring concrete, eliminating formwork gaps and elastic deformation, so that the verticality detection is more in line with the actual situation after pouring concrete. The control accuracy is greatly improved compared with conventional methods, and verticality errors can be discovered in a timely manner. The formwork installation can be adjusted by discharging sand, reducing the loss of rework after concrete pouring, thereby improving the construction quality and progress of bridge piers.

[0023] 2. The positioning device for verticality monitoring proposed in the present invention has laser receiving targets radially arranged around the outer formwork, which can avoid the influence of scaffolding, safety net or construction tools on the outer side of the formwork on detection, so that the verticality can be detected and verified at any time during the entire construction process, providing convenience for verticality monitoring. It not only has detection data before pouring, but also detection data after pouring, which provides installation data with certain reference value for the repeated use of inner and outer formwork, making the construction verticality verification and adjustment more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the front cross-section structure of the positioning device proposed by the present invention;

[0025] Figure 2 This is a schematic diagram of pouring concrete on the upper side of the lower foundation section proposed by the present invention;

[0026] Figure 3 This is a schematic diagram of the top view of the inner and outer templates proposed in the present invention.

[0027] In the figure: 1 inner formwork, 2 outer formwork, 3 workbench, 4 casting false bottom, 5 laser receiving target, 6 tension rods, 7 pier body, 8 sand discharge window, 9 bearing platform, 10 lower foundation section, 11 inclined surface, 12 steel skeleton, 13 sealing cross plate, 14 sand, 15 casting pipe, 16 detection schematic line. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0030] Reference Figure 1-3 , a thin-walled hollow pier casting verticality monitoring method and positioning device, the positioning device includes an inner template 1, an outer template 2, a workbench 3, a casting false bottom 4 and a laser receiving target 5;

[0031] The inner formwork 1 and the outer formwork 2 are fixed to the surface of the thin-walled hollow pier 7 by means of a tension rod 6, and a sand discharge window 8 is reserved on the surface of the outer formwork 2;

[0032] The workbench 3 is fixedly mounted on the surface of the outer template 2 and the inner template 1 respectively, and the laser receiving target 5 is fixedly mounted on the surface of the outer template 2;

[0033] The casting false bottom 4 is installed in the casting cavity between the inner formwork 1 and the outer formwork 2;

[0034] The method for monitoring the verticality of thin-walled hollow pier casting includes the following specific steps:

[0035] S1. Pouring of foundation: First, build a cap 9 on the ground, erect a formwork on the upper surface of the cap 9, and cast the lower foundation section 10 of the pier body. The upper surface of the lower foundation section 10 is smoothed with an inclined surface 11. The angle between the inclined surface 11 and the horizontal plane is 30°±10°. The inner formwork 1 and the outer formwork 2 are fixedly installed on the surface of the lower foundation section 10 to form a lower inner and outer formwork system. After the lower formwork system is installed, use a level and a total station to check the elevation of the top surface of the lower formwork system and the center and plane dimensions of the pier body. If they meet the standards, proceed to the next process and ensure that the error of the laser receiving targets 5 on the four sides is no more than 5mm at the same level.

[0036] S2, hoisting and welding of the steel skeleton 12, in step S1, a steel pile head is reserved on the upper surface of the lower foundation section 10, and the steel skeleton 12 is welded to the steel pile head;

[0037] S3, filling sand for pre-compression, installing a blocking plate 13 at the sand discharge window 8, and filling sand 14 into the casting cavity between the inner formwork 1 and the outer formwork 2;

[0038] The lower formwork system is offset. In the local area of ​​the upper surface of the lower formwork system, the inner formwork 1 and the outer formwork 2 are assembled to form the upper formwork system. The upper formwork system is discontinuous, but the lower formwork system needs to be pre-stressed. A casting false bottom 4 is placed in the upper formwork system, and bolts are inserted on the outside of the upper formwork system to tilt and fix the casting false bottom 4. The tilt angle can be controlled at 30°±10°, which is convenient for subsequent sand discharge from the sand discharge window 8. A casting pipe 15 is provided on the upper surface of the casting false bottom 4, which is connected up and down. The casting pipe 15 is convenient for pouring concrete on the lower side of the casting false bottom 4. Sand 14 is pre-pressed on the casting false bottom 4 to adjust the position of the lower formwork system, that is, to control the error of the laser receiving targets 5 on the same level to be no more than 5mm.

[0039] S4. Check and adjust the template verticality. Use the laser total station to display the light spot on the laser receiving target and capture the spot center. Adjust the template so that the distance between the inner side of the outer template 2 and the laser spot center is the same as the distance between the observation point and the pier body 7.

[0040] The method of adjusting the template is to loosen the tie rod between the inner template 1 and the outer template 2, or / and discharge the sand 14 in the lower template system, or / and add sand 14 to the lower template system, and adjust the verticality of the inner and outer templates so that the position of the laser receiving target 5 meets the requirements. Then, steel pipes arranged in a well shape are added to the surface of the inner template 1 and the outer template 2 to bundle and fix them;

[0041] S5. The sand 14 filled in step S3 is discharged and concrete is poured. The laser receiving target 5 in step S4 is used to display the light spot and capture the spot center to monitor and verify the verticality.

[0042] It should be noted that the position of the laser receiving target 5 is verified in the same manner as the verticality measurement method. An observation point is buried on the pedestal 9 at a position 1 m away from the pier body 7. An automatic leveling laser total station is used to capture the laser receiving target 5 at the observation point. A light spot is displayed at the end of the laser receiving target 5, so that the distance between the inner side of the outer template 2 and the center of the laser spot is the same as the distance between the observation point and the pier body 7, that is, the detection schematic line 16 is parallel to the plumb line on the surface of the thin-walled hollow pier body.

[0043] By adopting the above-mentioned monitoring method, sand 14 is used to pre-press the formwork system before pouring concrete, thereby eliminating the gap and elastic deformation of the formwork, and making the verticality detection more consistent with the actual situation after pouring concrete. The verticality control accuracy is greatly improved compared with the conventional method, and the verticality error can be discovered in time. The formwork installation can be adjusted by discharging sand, reducing the loss of rework after concrete pouring. Thus, the problem of easy deviation of large-volume concrete pouring formwork and difficult control of verticality is solved, and the construction quality and construction progress of super-high bridge piers are improved.

[0044] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for monitoring the verticality of thin-walled hollow pier casting, characterized in that: The monitoring method comprises a positioning device, wherein the positioning device comprises an inner template (1), an outer template (2), a workbench (3), a casting false bottom (4) and a laser receiving target (5); The inner formwork (1) and the outer formwork (2) are fixedly attached to the surface of the thin-walled hollow pier body (7) via a tension rod (6), and a sand discharge window (8) is reserved on the surface of the outer formwork (2); The workbench (3) is fixedly mounted on the surface of the outer template (2) and the inner template (1), respectively, and the laser receiving target (5) is fixedly mounted on the surface of the outer template (2); The casting false bottom (4) is installed in the casting cavity between the inner formwork (1) and the outer formwork (2); The method for monitoring the verticality of thin-walled hollow pier casting includes the following specific steps: S1. Pouring of foundation: first, build a cap (9) on the ground, erect a formwork on the upper surface of the cap (9), cast the lower foundation section (10) of the pier body, smooth out the upper surface of the lower foundation section (10) with an inclined surface (11), and fix the inner formwork (1) and the outer formwork (2) on the surface of the lower foundation section (10) to form the lower inner and outer formwork system; S2, hoisting and welding of the steel frame (12), in step S1, a steel pile head is reserved on the upper surface of the lower foundation section (10), and the steel frame (12) is welded to the steel pile head; S3, filling sand for pre-compression, installing a blocking horizontal plate (13) at the sand discharge window (8), and filling sand (14) into the casting cavity between the inner template (1) and the outer template (2); S4. Check and adjust the template verticality. Use the laser total station to display the light spot on the laser receiving target and capture the spot center. Adjust the template so that the distance between the inner side of the outer template (2) and the laser spot center is the same as the distance between the observation point and the pier body (7). S5, discharging the sand (14) filled in step S3 and pouring concrete; During step S3, the lower template system is offset, and the inner template (1) and the outer template (2) assembled on the upper surface of the lower template system form an upper template system. A casting false bottom (4) is placed in the upper template system, and bolts are inserted on the outer side of the upper template system to fix the casting false bottom (4). A casting pipe (15) is provided on the upper surface of the casting false bottom (4) that is connected to the upper and lower sides. Sand (14) is filled on the casting false bottom (4) for pre-compression to adjust the position of the lower template system.

2. A method for monitoring the verticality of thin-walled hollow pier casting according to claim 1, characterized in that: In step S1, the angle between the inclined surface (11) on the upper surface of the lower foundation section (10) and the horizontal plane is 30°±10°. After the lower template system is installed, the elevation of the top surface of the lower template system and the center and plane dimensions of the pier body are checked with a level and a total station. If they meet the standards, the next process is carried out.

3. A method for monitoring the verticality of thin-walled hollow pier casting according to claim 2, characterized in that: During step S4, by loosening the tie rods between the inner template (1) and the outer template (2), or / and discharging sand (14) in the lower template system, or / and adding sand (14) to the lower template system, the position of the laser receiving target (5) is adjusted so that the verticality of the inner and outer templates (2) meets the requirements, and steel pipes arranged in a well shape are added to the surfaces of the inner template (1) and the outer template (2) for bundling and fixing.

4. A method for monitoring the verticality of thin-walled hollow pier casting according to any one of claims 1 to 3, characterized in that: During the step S5, the laser receiving target (5) in step S4 is used to display the light spot and capture the spot center to perform verticality monitoring and verification.

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