A prefabricated beam axis measurement unit device and a prefabricated beam axis measurement method

Abstract

The present application relates to a prefabricated beam axis measurement unit device and a prefabricated beam axis measurement method. Since part of the embedded iron plate is embedded in the prefabricated beam and a scale sticker is attached to the embedded iron plate, the randomness of the measurement error is reduced, and the axis position of the prefabricated beam can be accurately recorded. A total station is set up, and the coordinate value of the reflector is measured by the total station to determine whether the coordinate value of the reflector measured by the total station is equal to the designed coordinate value. If they are equal, the data indicated by the positioning part on the scale sticker is recorded. If they are not equal, the box is moved, and the coordinate value of the reflector is re-measured by the total station, and re-judged. Since the automatic centering device is used to brake the vertical rod, no manual adjustment is required, thereby reducing the safety risk for the measurement personnel.

Description

Technical Field

[0001] The present application relates to the field of bridge construction, and in particular to a precast beam axis measurement unit device and a precast beam axis measurement method. Background Art

[0002] At present, during the prefabrication and installation of existing bridges, the precise determination of the centerline of each beam segment is directly related to the overall linear shape of the bridge.

[0003] In the related art, a total station is used in combination with a prism rod to perform measurements, and then a marker pen is used to mark the center axis point of the beam segment.

[0004] However, since the period from the beam section leaving the factory to installation is generally long, the marking points on the top surface of the beam section are very easy to disappear. In addition, when using a total station combined with a prism rod for measurement, it is necessary to manually hold the prism rod to measure. The pier top beam section is generally assembled using a bridge-building machine. Conventional measurement requires people to stand on the top of the beam to measure the beam section in real time, which poses a greater safety risk. Summary of the invention

[0005] The embodiments of the present application provide a precast beam axis measurement unit device and a precast beam axis measurement method to solve the problem in the related art that the markings made with a marker pen are very easy to disappear and a person needs to stand on the top of the beam to perform real-time measurement of the beam section, which poses a high safety risk.

[0006] In a first aspect, a precast beam axis measurement unit device is provided, comprising:

[0007] A box body, wherein an installation groove is opened at the upper end of the box body along the width direction, a support rod is installed in the installation groove along the length direction of the installation groove, a vertical rod is rotatably connected to the support rod, a reflective sheet is fixed at the upper end of the vertical rod, and an aluminum plate is installed at the lower end of the vertical rod;

[0008] An automatic centering device, which is arranged on the box body and is used to brake the vertical rod;

[0009] Among them, a positioning part is marked on an axis of the side walls at both ends along the width direction of the box body. The axis and the support rod are in the same plane, and the plane is perpendicular to the upper side wall or lower side wall of the box body. The center point of the reflector is located on the axis.

[0010] In some embodiments, the axis is a central axis.

[0011] In some embodiments, the automatic centering device includes two magnets, which are arranged opposite to each other and at intervals, and the opposite walls of the two magnets have the same polarity, and a channel for the movement of the aluminum plate is formed between the two magnets, and the two magnets and the center of the aluminum plate are roughly distributed on the axis.

[0012] In some embodiments, the positioning portion is a marking arrow, a scale line, a marking protrusion or a marking hole.

[0013] In some embodiments, the magnet is a permanent magnet or an electromagnet.

[0014] In some embodiments, the device further comprises a plurality of pre-embedded iron plates, and the pre-embedded iron plates are used to support the box body.

[0015] In some embodiments, the device further comprises a scale, and the scale is used to record the position of the positioning part.

[0016] In some embodiments, an adhesive strip is provided at the bottom of the scale, or the scale is provided with a scale sticker.

[0017] In a second aspect, a method for measuring the axis of a precast beam using the above-mentioned precast beam axis measuring unit device is provided, wherein a portion of the embedded iron plate is embedded in the precast beam, a scale is attached to the embedded iron plate, and the precast beam axis measuring unit device is placed on the embedded iron plate;

[0018] Set up a total station, use the total station to measure the coordinate value of the reflector, and determine whether the coordinate value of the reflector measured by the total station is equal to the designed coordinate value;

[0019] If they are equal, record the data indicated by the positioning part on the scale;

[0020] If they are not equal, the box is moved, and the coordinate value of the reflector is re-measured using a total station, and a new judgment is made.

[0021] In some embodiments, after determining that the coordinate value of the reflector is not equal to the design coordinate value, before moving the box, the method further includes the following steps:

[0022] Determine the size of the difference between the coordinate value of the reflector and the design coordinate value, and if the difference is greater than a first preset value, move the box at a speed within a first preset range;

[0023] If it is less than or equal to a second preset value, the box is moved at a speed within a second preset range;

[0024] The minimum speed value within the first preset speed range is greater than or equal to the maximum speed value within the second preset speed range.

[0025] The beneficial effects of the technical solution provided by this application include:

[0026] The embodiment of the present application provides a precast beam axis measurement unit device and a precast beam axis measurement method. Since part of the embedded iron plate is embedded in the precast beam and a scale sticker is affixed to the embedded iron plate, the randomness of the measurement error is reduced, and the axis position of the precast beam can be accurately recorded; a total station is set up, and the coordinate value of the reflector is measured by the total station to determine whether the coordinate value of the reflector measured by the total station is equal to the designed coordinate value; if they are equal, the data indicated by the positioning part on the scale sticker is recorded; if they are not equal, the box is moved, and the coordinate value of the reflector is re-measured by the total station, and re-judged. Since the automatic centering device is used to brake the vertical rod, no manual adjustment is required, thereby reducing the safety risk for the measurement personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram of the structure of a precast beam axis measurement unit device provided in an embodiment of the present application;

[0029] Figure 2 A cross-sectional view of a precast beam axis measurement unit device provided in an embodiment of the present application.

[0030] In the figure: 1. Box body; 2. Installation groove; 3. Support rod; 4. Vertical rod; 5. Reflector; 6. Aluminum plate; 7. Positioning part; 8. Embedded iron plate; 9. Scale; 10. Magnet. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0032] The embodiments of the present application provide a precast beam axis measurement unit device and a precast beam axis measurement method to solve the problem in the related art that the markings made with a marker pen are very easy to disappear and a person needs to stand on the top of the beam to perform real-time measurement of the beam section, which poses a high safety risk.

[0033] See also Figure 1-2In the first aspect, a prefabricated beam axis measuring unit device is provided, which includes a box body 1 and an automatic centering device, wherein the upper end of the box body 1 is provided with a mounting groove 2 along the width direction, a support rod 3 is installed in the mounting groove 2 along the length direction of the mounting groove 2, a vertical rod 4 is rotatably connected to the support rod 3, a reflective sheet 5 is fixed to the upper end of the vertical rod 4, and an aluminum plate 6 is installed at the lower end of the vertical rod 4; the automatic centering device is arranged on the box body 1, which is used to brake the vertical rod 4; wherein a positioning portion 7 is marked on an axis of the side walls at both ends of the width direction of the box body 1, the axis and the support rod 3 are in the same plane, and the plane is perpendicular to the upper side wall or the lower side wall of the box body 1, and the center point of the reflective sheet 5 is located on the axis.

[0034] In the present application, the box body 1 is generally a rectangular box body, the interior of the box body 1 is a hollow structure, and an installation groove 2 is opened at the upper end of the box body 1 along the width direction. The installation groove 2 is connected to the interior of the box body 1, and the vertical rod 4 is rotatably connected to the support rod 3 through a bearing to ensure that the vertical rod 4 can rotate around the support rod 3 with relatively small friction.

[0035] During actual use, part of the embedded iron plate 8 is embedded in the prefabricated beam, and a scale ruler 9 is attached to the embedded iron plate 8, and the prefabricated beam axis measurement unit device is placed on the embedded iron plate 8; a total station is set up, and the coordinate value of the reflector 5 is measured by the total station to determine whether the coordinate value of the reflector 5 measured by the total station is equal to the designed coordinate value; if they are equal, the data indicated by the positioning part 7 on the scale ruler 9 is recorded; if they are not equal, the box 1 is moved, and the coordinate value of the reflector 5 is re-measured by the total station, and re-judged.

[0036] In this process, due to the influence of the environment, the lower end surface of the entire box body 1 may no longer be on the horizontal plane during the measurement. Therefore, under the influence of gravity, the vertical rod 4 will rotate relative to the support rod 3, so that the reflective sheet 5 is always in a vertical state, which is convenient for the total station to measure its coordinates. The automatic centering device can brake the vertical rod 4, so that the vertical rod 4 is not easy to shake during the measurement process, which is convenient for accurately measuring the coordinates of the reflective sheet 5.

[0037] Furthermore, the axis is a central axis.

[0038] That is to say, at this time, the installation groove 2, the support rod 3, the vertical rod 4, the reflective sheet 5, the aluminum plate 6 and the positioning part 7 are all on this central axis, that is, in the middle of the length of the box body 1. Since the weight of the aluminum plate 6 is much greater than the weight of the reflective sheet 5 and the vertical rod 4, when the reflective sheet 5, the vertical rod 4 and the aluminum plate 6 are configured as a structure, the center of gravity of the entire structure is located on the aluminum plate 6, which can make the reflective sheet 5 in an automatic vertical state.

[0039] Furthermore, the automatic centering device includes two magnets 10, which are arranged opposite to each other and at intervals, and the opposite walls of the two magnets 10 have the same polarity, and a channel for the movement of the aluminum plate 6 is formed between the two magnets 10, and the centers of the two magnets 10 and the aluminum plate 6 are roughly distributed on the axis.

[0040] In the present application, the two magnets 10 have the same size and specifications. Therefore, when the polarities of the walls facing each other are the same, that is, when the N poles or S poles of the two magnets 10 are facing each other, electromagnetic damping is formed between the two magnets 10. Therefore, when the aluminum plate 6 enters between the two magnets 10, the swinging speed of the aluminum plate 6 is greatly reduced until it cannot swing, which is equivalent to giving the aluminum plate 6 a braking effect. Therefore, during the measurement process, this braking effect can also prevent the reflector 5 from shaking due to environmental effects such as wind, thereby improving the accuracy of the measurement. However, it should be understood that this braking degree has a certain upper limit, and priority should be given to ensuring that the reflector 5 is in an automatic vertical state when the box 1 is in a tilted state.

[0041] In the present application, the positioning portion 7 is a marking arrow, a scale line, a marking protrusion or a marking hole. In the present application, a triangular marking arrow is preferably made on the box body 1.

[0042] In the present application, the magnet 10 is a permanent magnet or an electromagnet, and is generally preferably a permanent magnet. The permanent magnet is fixed in the box 1, which is convenient to carry and applicable to many scenarios.

[0043] Furthermore, the device also includes a plurality of pre-embedded iron plates 8 , and the pre-embedded iron plates 8 are used to support the box body 1 .

[0044] Furthermore, the device also includes a ruler 9, and the ruler 9 is used to record the position of the positioning part 7. Preferably, an adhesive strip is provided at the bottom of the ruler 9, or the ruler 9 uses a scale sticker.

[0045] In the actual operation, since part of the embedded iron plate 8 is embedded in the prefabricated beam and a scale 9 is attached to the embedded iron plate, the randomness of the measurement error is reduced and the axis position of the prefabricated beam can be accurately recorded.

[0046] In a second aspect, a method for measuring the axis of a precast beam using the above-mentioned precast beam axis measuring unit device is provided, wherein a portion of the embedded iron plate 8 is embedded in the precast beam, a scale 9 is attached to the embedded iron plate 8, and the precast beam axis measuring unit device is placed on the embedded iron plate 8;

[0047] Setting up a total station, using the total station to measure the coordinate value of the reflector 5, and determining whether the coordinate value of the reflector 5 measured by the total station is equal to the designed coordinate value;

[0048] If they are equal, record the data indicated by the positioning part 7 on the scale 9;

[0049] If they are not equal, the box 1 is moved, and the coordinate value of the reflector 5 is re-measured using a total station, and a new judgment is made.

[0050] The method provided in this application is to measure the central axis during the production process of prefabricated beams in the factory. Therefore, there is no need to use people to stand on the top of the beam to measure the beam section in real time during the assembly process, which poses a great safety risk.

[0051] Furthermore, after determining that the coordinate value of the reflector 5 is not equal to the design coordinate value, before moving the box 1, the method further includes the following steps:

[0052] Determine the size of the difference between the coordinate value of the reflector 5 and the design coordinate value, and if it is greater than a first preset value, move the box 1 at a speed within a first preset range;

[0053] If it is less than or equal to a second preset value, the box 1 is moved at a speed within a second preset range;

[0054] The minimum speed value within the first preset speed range is greater than or equal to the maximum speed value within the second preset speed range.

[0055] Determine the size of the difference between the coordinate value of the reflector 5 and the design coordinate value, and if it is greater than a first preset value, move the box 1 at a speed within a first preset range;

[0056] If it is less than or equal to the second preset value, the step of moving the box 1 at a speed within the second preset range is equivalent to performing coarse adjustment first and then fine adjustment. Moving the box 1 can also be done by using some mechanical devices, which can not only ensure a smooth trajectory, but also control its speed, which is relatively stable.

[0057] In the present application, a method for assembling the axis of a precast beam is also provided, wherein a portion of the embedded iron plate 8 is embedded in the precast beam, a scale 9 is attached to the embedded iron plate 8, and a precast beam axis measuring unit device is placed on the embedded iron plate 8;

[0058] Setting up a total station, using the total station to measure the coordinate value of the reflector 5, and determining whether the coordinate value of the reflector 5 measured by the total station is equal to the designed coordinate value;

[0059] If they are equal, record the data indicated by the positioning part 7 on the scale 9;

[0060] If they are not equal, move the box 1, use the total station to re-measure the coordinate value of the reflector 5, and re-judge until the coordinate value of the reflector 5 measured by the total station is equal to the designed coordinate value, and record the data indicated by the positioning part 7 on the scale 9;

[0061] Assembly preparation: set up a total station, use the total station to measure the coordinate value of the reflector 5, and determine whether the coordinate value of the reflector 5 measured by the total station is equal to the designed coordinate value;

[0062] If they are equal, draw the data indicated by the positioning part 7 on the scale 9;

[0063] If they are not equal, move the box 1, use the total station to re-measure the coordinate value of the reflector 5, and re-judge until the coordinate value of the reflector 5 measured by the total station is equal to the designed coordinate value, and draw the data indicated by the positioning part 7 on the scale 9.

[0064] In the actual process, there may be one to two years between the production of prefabricated beams and the actual assembly. During this process, the concrete will change due to thermal expansion and contraction. Therefore, there may be certain deviations in the data measured in the factory. Therefore, a review is required before assembly. At this stage, because the time is relatively short and the mark will not disappear, there is no need to record the data. It is only necessary to draw the data indicated by the positioning part 7 on the scale 9.

[0065] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the 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 the specific circumstances.

[0066] It should be noted that, in this application, relational 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 such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0067] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent 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 the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for measuring the axis of a precast beam using a precast beam axis measuring unit device, characterized in that: The precast beam axis measurement unit device includes: A box body (1), wherein an installation groove (2) is formed at the upper end of the box body (1) along the width direction, a support rod (3) is installed in the installation groove (2) along the length direction of the installation groove (2), a vertical rod (4) is rotatably connected to the support rod (3), a reflective sheet (5) is fixed at the upper end of the vertical rod (4), and an aluminum plate (6) is installed at the lower end of the vertical rod (4); a triangular arrow is marked on the box body, and the triangular arrow is a positioning portion (7); An automatic centering device, which is arranged on the box body (1) and is used to brake the vertical rod (4) so ​​that the vertical rod (4) is not prone to shaking during the measurement process; Wherein, the installation groove (2), the support rod (3), the vertical rod (4), the reflective sheet (5), the aluminum plate (6) and the positioning portion (7) are all arranged in the middle of the length direction of the box; The precast beam axis measurement method comprises: Embedding part of the embedded iron plate (8) in the prefabricated beam, attaching a scale (9) to the embedded iron plate (8), and placing a prefabricated beam axis measurement unit device on the embedded iron plate (8); Setting up a total station, using the total station to measure the coordinate value of the reflector (5), and determining whether the coordinate value of the reflector (5) measured by the total station is equal to the designed coordinate value; If they are equal, record the data indicated by the positioning part (7) on the scale (9); If they are not equal, the box (1) is moved, and the coordinate value of the reflector (5) is remeasured using a total station, and the judgment is made again; since part of the embedded iron plate (8) is embedded in the prefabricated beam, and a scale (9) is attached to the embedded iron plate (8), the axis position of the prefabricated beam can be recorded.

2. The method for measuring the axis of a precast beam according to claim 1, characterized in that: The bottom of the scale (9) is provided with an adhesive strip, or the scale (9) uses a scale sticker.

3. The method for measuring the axis of a precast beam according to claim 1, characterized in that: After determining that the coordinate value of the reflective sheet (5) is not equal to the designed coordinate value, before moving the box (1), the method further includes the following steps: Determining the size of the difference between the coordinate value of the reflective sheet (5) and the design coordinate value, and if the difference is greater than a first preset value, moving the box (1) at a speed within a first preset range; If it is less than or equal to a second preset value, moving the box (1) at a speed within a second preset range; The minimum speed value within the first preset speed range is greater than or equal to the maximum speed value within the second preset speed range.

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