A device and method for measuring and positioning the axis of precast segmental beams

Abstract

The present application relates to a device and method for measuring and positioning the axis of precast segmental beams, which includes: a buried component for being buried in the precast segmental beam along the transverse direction of the bridge, and both ends of which are respectively located on both sides of the axis of the precast segmental beam; a connecting piece; a cross bar provided with scales; the cross bar is parallel to the buried component and is detachably connected to the buried component through the connecting piece; a positioning indicator movably arranged on the cross bar, indicating the scale value where it is located, and used to provide a marking point for the total station. At the factory segment, the cross bar and the positioning indicator are installed on the buried component through the connecting piece, and then the scale of the factory axis point corresponding to the axis point of the precast segmental beam is obtained through the total station; when installing the precast segmental beam on the pier, only need to move the positioning indicator to the scale of the factory axis point, so that when erecting the precast segmental beam, the axis point can be obtained without measurement, not affected by the disappearance of the marking point, and avoiding the need to hold the reflector.

Description

Technical Field

[0001] This application relates to the field of bridge construction survey control, and particularly to a device and method for measuring and positioning the axis of precast segmental beams. Background Art

[0002] At present, precast segmental beams refer to dividing the main beam of the upper structure of a bridge into several segments, prefabricating them in a factory and then assembling them on site, and then applying prestress to make them into a whole. The commonly used methods for prefabricating segmental beams are short-line and long-line prefabrication. The principle is a construction process of converting the spatial coordinates of the beam segments into the local coordinate system of the precast pedestal for segment-by-segment matching.

[0003] In some related technologies, during the prefabrication and installation of segmental beams, the accurate determination of the central axes of each beam segment is directly related to the overall alignment of the bridge. The traditional measurement methods mainly have the following defects:

[0004] (1) When the precast segmental beam leaves the factory, the central axis points of the beam segment need to be marked on the concrete surface of the beam top with a marker pen. Since the period from the beam segment leaving the factory to installation is generally long, about two to three years, the marked points on the beam top are extremely easy to disappear, and due to creep, the actual positions of the axis points deviate from the designed positions.

[0005] (2) For the pier-top beam segment, large truck cranes are generally used for assembly. After assembly, reflector sheets are set on the precast segmental beam, and then the axis points are measured by a total station from a distance, and the precast segmental beam is adjusted according to the measurement results; however, during measurement, people need to stand on the beam top to hold the reflector sheet and move and adjust it. The measurement operation steps are cumbersome; walking at high altitude to hold the reflector sheet poses a greater safety risk. Summary of the Invention

[0006] The embodiments of this application provide a device and method for measuring and positioning the axis of precast segmental beams to solve the problem in the related technologies that the measurement steps of axis points are cumbersome due to holding the emitter sheet after the assembly of precast segmental beams.

[0007] In a first aspect, a device for measuring and positioning the axis of precast segmental beams is provided, which includes:

[0008] An embedded component, which is used to be embedded in the precast segmental beam along the transverse direction of the bridge, and its two ends are respectively located on both sides of the axis of the precast segmental beam;

[0009] A connecting piece;

[0010] A cross bar, which is provided with scales; the cross bar is parallel to the embedded component and is detachably connected to the embedded component through the connecting piece;

[0011] A positioning indicator, which is movably arranged on the cross bar, indicates the scale value where it is located, and is used to provide a marking point for the total station.

[0012] In some embodiments, the positioning indicator includes:

[0013] A slider that slides on the cross bar;

[0014] A scale pointer that is arranged on the slider and points to the scale value;

[0015] A reflector that is vertically arranged on the slider through a vertical rod, and the projection of its center point on the slider is located on the extension line of the scale pointer.

[0016] In some embodiments, the positioning indicator includes:

[0017] A slider that slides on the cross bar and is provided with a guiding groove in the longitudinal bridge direction;

[0018] A scale pointer that is arranged on the slider and is on the same straight line as the guiding groove;

[0019] A vertical rod, one end of which is movably connected to the slider through the guiding groove, the other end extends vertically, and is connected with a reflector;

[0020] A weight structure that is arranged on the vertical rod to keep the reflector vertical.

[0021] In some embodiments, the weight structure includes an arc rod connected to the vertical rod, and a weight ball is arranged on the arc rod.

[0022] In some embodiments, a roller connected to the vertical rod is arranged in the guiding groove; the groove depth of one end of the guiding groove close to the scale pointer is greater than that of the other end of the guiding groove.

[0023] In some embodiments, the embedded component includes a connecting rod and two sleeves, and the two sleeves are located at both ends of the connecting rod;

[0024] The connecting piece includes sleeve rods vertically connected to both ends of the cross bar, and the sleeve rods can be sleeved in the sleeves.

[0025] In some embodiments, the distance between the center point of the connection line at both ends of the embedded component and the axis of the precast segment beam is 3 - 5 cm.

[0026] In a second aspect, a method for measuring the axis of a precast segment beam is provided, including the following steps:

[0027] Provide a measuring and positioning device for the axis of the precast segment beam;

[0028] When precasting the precast segment beam in the factory, install the measuring and positioning device for the axis of the precast segment beam;

[0029] Obtain the factory axis point scale of the precast segment beam by using a total station and the precast segment beam axis measurement and positioning device;

[0030] When assembling the precast segment beam, move the positioning indicator to the factory axis point scale to complete the assembly measurement of the precast segment beam.

[0031] In some embodiments, obtaining the factory axis point scale of the precast segment beam by using a total station and the precast segment beam axis measurement and positioning device specifically includes the following steps:

[0032] Set up a total station in the precast yard, measure the actual coordinate values of the positioning indicator, and compare the actual coordinate values with the designed coordinate values;

[0033] If the actual coordinate values are equal to the designed coordinate values, use the scale corresponding to the actual coordinate values as the factory axis point scale;

[0034] If the actual coordinate values are not equal to the designed coordinate values, move the positioning indicator until the actual coordinate values are equal to the designed coordinate values.

[0035] In some embodiments, after obtaining the factory axis point scale of the precast segment beam by using a total station and the precast segment beam axis measurement and positioning device; before moving the positioning indicator to the factory axis point scale when assembling the precast segment beam, the following steps are further included:

[0036] Obtain the creep compensation value;

[0037] Use the creep compensation value to correct the factory axis point scale.

[0038] The beneficial effects brought by the technical solution provided in this application include:

[0039] The embodiments of this application provide a precast segment beam axis measurement and positioning device. Since the embedded component is embedded in the precast segment beam, and a cross bar is detachably connected through a connecting piece, a positioning indicator is movably arranged on the cross bar. The positioning indicator indicates the scale value where it is located and provides a marking point for the total station. Through the use of the above device, it is buried in the production stage of the precast segment beam, and then at the factory segment, the cross bar and the positioning indicator are installed on the embedded component through the connecting piece, and then the factory axis point scale corresponding to the axis point of the precast segment beam is obtained through the total station; when installing the precast segment beam on the pier and it is necessary to measure the axis point of the precast segment beam, only need to move the positioning indicator to the factory axis point scale, so that the measurement method of the axis of the precast segment beam on the pier is simple, the axis point can be obtained without measurement, it is not affected by the disappearance of the marking point, and the need to hold the reflector is avoided. Description of the Drawings

[0040] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0041] Figure 1 Explosion schematic diagram of the precast segment beam axis measurement and positioning device provided by the embodiment of the present application;

[0042] Figure 2 Schematic diagram of the positioning indicator provided by the embodiment of the present application;

[0043] Figure 3 Schematic diagram of the cooperation between the precast segment beam axis measurement and positioning device provided by the embodiment of the present application and the total station.

[0044] In the figure: 1. Embedded component; 100. Connecting rod; 101. Sleeve; 2. Precast segment beam; 3. Connecting piece; 300. Sleeve rod; 4. Cross bar; 5. Positioning indicator; 500. Slide block; 501. Scale pointer; 502. Reflective sheet; 503. Vertical rod; 504. Guide groove; 505. Arc rod; 506. Counterweight ball; 507. Roller. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0046] The embodiment of the present application provides a precast segment beam axis measurement and positioning device to solve the problem in the related technology that the measurement steps of the axis points are cumbersome due to the need to support the emission sheet after the assembly of the precast segment beam.

[0047] Please refer to Figures 1-3 , a precast segment beam axis measurement and positioning device, which includes an embedded component 1, a connecting piece 3, a cross bar 4, and a positioning indicator 5.

[0048] Among them, the embedded component 1 is used to be embedded in the precast segment beam 2 along the transverse bridge direction, and both ends of the embedded component 1 are located on both sides of the precast segment beam 2 respectively. That is to say, the connection line between both ends of the embedded component 1 is always perpendicular to the axis of the precast segment beam 2, and the axis of the precast segment beam 2 is located in the area between both ends of the embedded component 1.

[0049] The cross bar 4 is provided with scales along its length direction and is arranged parallel to the embedded component 1. The cross bar 4 is detachably connected to the embedded component 1 through the connecting piece 3, so that the cross bar 4 can be separated from the embedded component 1.

[0050] The positioning indicator 5 is movably arranged on the cross bar 4, and the moving direction is parallel to the length direction of the cross bar 4. The positioning indicator 5 can indicate the scale value on the cross bar 4 where it is located in real time and is used to provide a marking point for the total station. This marking point enables the total station to measure the specific position of the positioning indicator 5.

[0051] Through the above settings, during the production stage of the precast segment beam, the embedded component 1 is buried. Then, at the factory segment after the precast segment beam is poured and completed, the positioning indicator 5 is arranged on the cross bar 4 and installed on the embedded component 1 through the connecting piece 3. Then, the scale of the factory axis point corresponding to the axis point of the precast segment beam is obtained through the total station, that is, the scale indicated when the positioning indicator 5 is located at the axis point.

[0052] When it is necessary to measure the axis point of the precast segment beam during the installation of the precast segment beam on the pier, only need to move the positioning indicator 5 to the scale of the factory axis point, which makes the measurement method of the axis of the precast segment beam on the pier simple, not affected by the disappearance of the marking point, and avoids holding the reflector, improving the accuracy and work efficiency.

[0053] In addition, since there are scales on the cross bar 4, by moving the positioning indicator 5, the axis measurement accuracy can reach the millimeter level, improving the measurement accuracy while also improving the work efficiency of the measurement.

[0054] In some preferred embodiments, the positioning indicator 5 includes a slider 500, a scale pointer 501, a reflector 502, and a vertical rod 503. The slider 500 slides on the cross bar 4; the scale pointer 501 is arranged on the slider 500 and points to the scale value; the reflector 502 is vertically arranged on the slider 500 through the vertical rod 503, and the projection of its center point on the slider 500 is located on the extension line of the scale pointer 501, so as to ensure that the position of the axis point detected by the total station is consistent with the center position of the reflector 502 and ensure accuracy.

[0055] In some preferred embodiments, as Figure 1 and Figure 2 shown, considering that the perpendicularity at both ends of the vertical rod 503 of the positioning indicator 5 changes and affects the measurement result, an optimized setting is made in the previous embodiment:

[0056] The positioning indicator 5 includes a slider 500, a scale pointer 501, a reflector 502, a vertical rod 503, a guide groove 504, and a weight structure.

[0057] The slider 500 is slidably arranged on the cross bar 4 and is provided with a guiding groove 504 in the longitudinal bridge direction;

[0058] The scale pointer 501 is arranged on the slider 500 and points to the scale value; the scale pointer 501 and the guiding groove 504 are on the same straight line; one end of the vertical rod 503 is movably connected to the slider 500 through the guiding groove 504, the other end extends vertically and is connected with a reflecting sheet 502; a counterweight structure is arranged on the vertical rod 503 to keep the reflecting sheet 502 vertical.

[0059] During the movement of the precast segment beam 2, the counterweight structure therein will cause the vertical rod 503 to move along the guiding groove 504, and after the precast segment beam 2 stops moving, under the action of the counterweight structure, the vertical rod 503 gradually stops moving by using the principle of gravity balance, and after stopping, the counterweight structure makes the vertical rod 503 always keep a vertical state to achieve self-balancing.

[0060] Further, the counterweight structure includes an arc-shaped rod 505 connected to the vertical rod 503, and counterweight balls 506 are arranged on the arc-shaped rod. The number and positions of the counterweight balls 506 on the arc-shaped rod 505 can be adjusted according to the actual situation.

[0061] Further, for the convenience of self-balancing and the movement of the vertical rod 503, the following settings are made:

[0062] A roller 507 connected to the vertical rod 503 is arranged in the guiding groove 504; the groove depth at one end of the guiding groove 504 close to the scale pointer 501 is greater than that at the other end of the guiding groove 504.

[0063] The roller 507 facilitates the movement, and finally the stopping position of the vertical rod 503 is always at the end of the guiding groove 504 close to the scale pointer 501 under the action of gravity, ensuring the accuracy of the stopping position and facilitating measurement.

[0064] In some preferred embodiments, for the convenience of connecting the cross bar 4, the following settings are made:

[0065] The embedded component 1 includes a connecting rod 100 and two sleeves 101. The two sleeves 101 are located at both ends of the connecting rod 100; the connecting component 3 includes sleeve rods 300 vertically connected to both ends of the cross bar 4. The cross bar 4 is parallel to the connecting rod 100, and the sleeve rods 300 can be sleeved in the sleeves 101.

[0066] Through the sleeving method, it is convenient for the connection and disassembly of the cross bar 4 and the embedded component 1 and facilitates the measurement operation.

[0067] Further, the distance between the center point of the connection line at both ends of the embedded component 1 and the axis of the precast segment beam 2 is 3 - 5 cm.

[0068] The present application also provides a method for measuring the axis of precast segmental beams, which includes the following steps:

[0069] Provide the above-mentioned measuring and positioning device for the axis of precast segmental beams;

[0070] During factory prefabrication, embed the embedded component 1 at both ends of the precast segmental beam 2, and the embedded components 1 at both ends are arranged in parallel;

[0071] After the pouring of the precast segmental beam 2 is completed, set the positioning indicator 5 on the cross bar 4, and then install it on the embedded component 1 through the connecting piece 3;

[0072] Use a total station and the measuring and positioning device for the axis of precast segmental beams to obtain the scale of the factory outlet axis points of the precast segmental beam 2;

[0073] When assembling the precast segmental beam 2, move the positioning indicator 5 to the scale of the factory outlet axis points to complete the assembly measurement of the precast segmental beam 2.

[0074] Through the above steps, the position of the axis can be determined at the factory outlet. During the later construction and assembly, only the positioning indicator 5 needs to be moved, and there is no need to measure again. This reduces the measurement steps and avoids the safety hazards of high-altitude measurement.

[0075] In some preferred embodiments, using a total station and the measuring and positioning device for the axis of precast segmental beams to obtain the scale of the factory outlet axis points of the precast segmental beam 2 specifically includes the following steps:

[0076] Set up a total station in the prefabrication yard, measure the actual coordinate values of the positioning indicator 5, and compare the actual coordinate values with the design coordinate values;

[0077] If the actual coordinate values are equal to the design coordinate values, then use the scale corresponding to the actual coordinate values as the scale of the factory outlet axis points;

[0078] If the actual coordinate values are not equal to the design coordinate values, then move the positioning indicator 5, and then measure it with a total station and make a comparison until the actual coordinate values are equal to the design coordinate values.

[0079] In some preferred embodiments, since after the precast segmental beam 2 is manufactured and leaves the factory, it may take two or three years before erection, and there is a creep process in the middle. Therefore, considering this point, the following settings are made:

[0080] After using a total station and the measuring and positioning device for the axis of precast segmental beams to obtain the scale of the factory outlet axis points of the precast segmental beam 2; before moving the positioning indicator 5 to the scale of the factory outlet axis points when assembling the precast segmental beam 2, the following steps are also included:

[0081] Obtain the creep compensation value;

[0082] The factory axis point scale is corrected by using the creep compensation value, and the creep compensation value can be obtained through tests.

[0083] This step is to ensure the measurement accuracy and the construction quality.

[0084] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected" and "connected" 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 application can be understood according to specific situations.

[0085] It should be noted that in the present application, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0086] The above description is only the specific implementation manners of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A device for measuring and positioning the axis of precast segmental beams, characterized in that, It includes: An embedded component (1) which is used to be embedded in the precast segment beam (2) along the transverse direction of the bridge, and both ends of which are respectively located on both sides of the axis of the precast segment beam (2); A connecting piece (3); A cross bar (4) provided with scales; the cross bar (4) is parallel to the embedded component (1) and is detachably connected to the embedded component (1) through the connecting piece (3); the embedded component (1) includes a connecting rod (100) and two sleeves (101), and the two sleeves (101) are located at both ends of the connecting rod (100); The connecting piece (3) includes sleeve rods (300) vertically connected to both ends of the cross bar (4), and the sleeve rods (300) can be sleeved in the sleeves (101); A positioning and indicating piece (5) which is movably arranged on the cross bar (4), indicates the scale value where it is located, and is used to provide a marking point for the total station; The positioning and indicating piece (5) includes: a slider (500) which slides on the cross bar (4); a scale pointer (501) which is arranged on the slider (500) and points to the scale value; a reflector (502) which is vertically arranged on the slider (500) through a vertical rod (503), and the projection of the center point of which on the slider (500) is located on the extension line of the scale pointer (501); Or, the positioning and indicating piece (5) includes: a slider (500) which slides on the cross bar (4) and is provided with a guiding groove (504) in the longitudinal direction of the bridge; a scale pointer (501) which is arranged on the slider (500) and is located on the same straight line as the guiding groove (504); a vertical rod (503) one end of which is movably connected to the slider (500) through the guiding groove (504), the other end of which extends vertically and is connected with a reflector (502); a weight structure which is arranged on the vertical rod (503) to keep the reflector (502) vertical.

2. The device for measuring and positioning the axis of the precast segment beam according to claim 1, wherein: The weight structure includes an arc-shaped rod (505) connected to the vertical rod (503), and a weight ball (506) is arranged on the arc-shaped rod.

3. The device for measuring and positioning the axis of the precast segment beam according to claim 1, wherein: A roller (507) connected to the vertical rod (503) is arranged in the guiding groove (504); the groove depth of one end of the guiding groove (504) close to the scale pointer (501) is greater than that of the other end of the guiding groove (504).

4. The device for measuring and positioning the axis of the precast segment beam according to claim 1, wherein: The distance between the center point of the connection line of both ends of the embedded component (1) and the axis of the precast segment beam (2) is 3 - 5 cm.

5. A method for measuring the axis of precast segmental beams, characterized in that, It includes the following steps: Provide the device for measuring and positioning the axis of the precast segment beam according to any one of claims 1 - 4; When prefabricating the precast segment beam (2) in the factory, install the device for measuring and positioning the axis of the precast segment beam; Use the total station and the device for measuring and positioning the axis of the precast segment beam to obtain the scale of the factory outlet axis point of the precast segment beam (2); When assembling the precast segmental beam (2), move the positioning indicator (5) to the factory axis point scale to complete the assembly measurement of the precast segmental beam (2).

6. The method for measuring the axis of the precast segment beam according to claim 5, characterized in that, Using a total station and the precast segmental beam axis measurement and positioning device to obtain the factory axis point scale of the precast segmental beam (2), specifically including the following steps: Set up a total station in the precast yard, measure the actual coordinate value of the positioning indicator (5), and compare the actual coordinate value with the design coordinate value; If the actual coordinate value is equal to the design coordinate value, take the scale corresponding to the actual coordinate value as the factory axis point scale; If the actual coordinate value is not equal to the design coordinate value, move the positioning indicator (5) until the actual coordinate value is equal to the design coordinate value.

7. The method for measuring the axis of precast segmental beams according to claim 5, characterized in that, After obtaining the factory axis point scale of the precast segmental beam (2) using a total station and the precast segmental beam axis measurement and positioning device; before moving the positioning indicator (5) to the factory axis point scale when assembling the precast segmental beam (2), the following steps are also included: Obtain the creep compensation value; Use the creep compensation value to correct the factory axis point scale.

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