A method for installing steel bar segments in tall columns

Abstract

The present application discloses a method for installing steel bar segments in tall columns, which relates to the technical field of tall pier and tower construction, and includes the following steps: a three-dimensional scanning device collects three-dimensional data of the cast column segments and their embedded steel bars, and establishes a three-dimensional A model; the steel bar segments to be installed are tied according to the design drawings, and a three-dimensional scanning device is used to establish a three-dimensional B model for the steel bar segments to be installed; the three-dimensional B model is virtually matched with the three-dimensional A model, and the deviation steel bars appearing in the three-dimensional B model are marked and the deviation data is output; the steel bar segments to be installed and the three-dimensional B model are repeatedly updated until the three-dimensional B model is completely matched with the three-dimensional A model, and the adjustment of the steel bar segments to be installed is completed; the steel bar segments to be installed are hoisted to the top of the embedded steel bars of the cast column segments, and installed in position. The method for installing steel bar segments in tall columns of the present application solves the problem that the existing technology cannot achieve rapid construction.

Description

Technical Field

[0001] The present application relates to the technical field of tall pier and tower body construction, and in particular to a method for installing steel bar segments in a tall column. Background Art

[0002] With the leapfrog development of construction technology, there are more and more tall towers and piers. The construction of tall concrete columns (a general term for tower bodies and pier bodies) generally adopts climbing formwork, sliding formwork and flip formwork to carry out segmented construction. With the rapid development of the economy, the demand for rapid construction is becoming more and more common, and rapid construction puts forward higher requirements on the construction quality of columns. Among them, one of the most important factors restricting the rapid construction of columns is steel bar binding.

[0003] In the related technology, two methods of steel bar tying are mainly used. In the first method, the construction workers use batch prefabrication at the back site, and then tie the steel bars individually after lifting. The single steel bar to be installed is aligned with the exposed reserved steel bars of the cast column. In the second method, the construction workers use the method of tying the steel bar segments of the column as a whole at the back site and assembling the whole on site.

[0004] However, the first method of steel bar tying, tying a single steel bar after lifting, is faced with various unfavorable factors as the column continues to increase, such as small working platform, slow lifting and transportation, high risk to personnel safety, and low efficiency, which greatly affect and restrict the rapid construction of tall columns.

[0005] The second method of steel bar binding has low installation accuracy due to the large number of steel bars in the cast segment of the column. After casting, its three-dimensional posture changes relative to the design state. The back-end column steel bar segment is bound as a whole and hoisted to the predetermined position, which is prone to inaccurate alignment with the reserved steel bars in the cast segment, resulting in displacement in height, position, or both. The steel bars need to be adjusted during the alignment installation, which is very difficult and inefficient, and has a greater safety risk, which greatly affects and restricts the rapid construction of tall columns. Summary of the invention

[0006] In view of the defects existing in the prior art, the purpose of this application is to provide a method for installing steel bar segments in tall columns to solve the problem that the prior art cannot achieve rapid construction.

[0007] In order to achieve the above purpose, the technical solution adopted is: a method for installing steel bar segments in a tall column, comprising the steps of:

[0008] The 3D scanning device collects 3D data of the cast column segments and their embedded steel bars, and establishes a 3D A model; the steel bar segments to be installed are tied according to the design drawings, and the 3D scanning device is used to establish a 3D B model of the steel bar segments to be installed;

[0009] Virtually match the 3D B model with the 3D A model, mark the deviation steel bars appearing in the 3D B model and output the deviation data; update the steel bar segment to be installed and the 3D B model according to the deviation data, and perform virtual matching again;

[0010] Repeatedly update the steel bar segment to be installed and the 3D B model until the 3D B model fully matches the 3D A model and the adjustment of the steel bar segment to be installed is completed; the steel bar segment to be installed is hoisted above the embedded steel bars of the cast column segment and installed in position.

[0011] On the basis of the above technical solution, the 3D scanning device collects 3D data of the embedded steel bars and establishes a 3D A model, including:

[0012] Four targets are placed on the embedded steel bars. The three-dimensional scanning device scans the embedded steel bars in sections. The adjacent section scans cover at least two identical targets as common reference points. All scanning results are spliced ​​to form a three-dimensional A model.

[0013] On the basis of the above technical solution, the four targets are distributed in a parallelogram shape, and the height of each target exceeds the height of all embedded steel bars.

[0014] Based on the above technical solution, the embedded steel bars are scanned in sections and spliced ​​to form a three-dimensional A model, including:

[0015] All the 3D data collected in different areas are sent to the central processing unit, which uses the targets as common reference points to perform splicing and establish a 3D A model of the embedded steel bars.

[0016] On the basis of the above technical solution, the steel bar segments to be installed are tied according to the design drawings, and a three-dimensional B model is established for the steel bar segments to be installed using a three-dimensional scanning device, including:

[0017] Prefabricate steel bars according to the design drawings and tie them together as a whole to form steel bar segments to be installed;

[0018] In the steel bar processing site, several 3D scanning devices are installed at fixed points and directions to establish an independent control network covering a certain range;

[0019] The steel bar segments to be installed are hoisted into the independent control network, and several 3D scanning devices collect and splice them to obtain a 3D B model.

[0020] Based on the above technical solutions, an independent control network covering a certain range is established, including:

[0021] Establish a coordinate system of an independent control network and set a number of control points with known coordinates. The control points are used to install a three-dimensional scanning device.

[0022] Each 3D scanning device independently scans and obtains partial 3D coordinates of the steel bar segment to be installed, and splices them together to obtain a 3D B model.

[0023] On the basis of the above technical solution, the steel bar processing site further comprises a support frame for supporting the steel bar segments to be installed and a hoisting device for lifting the steel bar segments to be installed.

[0024] Based on the above technical solution, the number of the control points is 4, and the 4 control points form a parallelogram.

[0025] Based on the above technical solution, the deviation steel bars appearing in the three-dimensional B model are marked and the deviation data is output, including:

[0026] Deviation steel bars are color-coded based on adjacent control points.

[0027] On the basis of the above technical solution, the three-dimensional scanning device adopts a three-dimensional laser scanner and a close-range photogrammetry instrument.

[0028] The beneficial effects of the technical solution provided by this application include:

[0029] The installation method of steel bar segments in tall columns of the present application takes the three-dimensional A model as a benchmark, first ties the actual steel bar segments to be installed according to the design drawings, establishes a three-dimensional B model according to the steel bar segments to be installed, and finds the deviation steel bars and deviation data through matching the three-dimensional A model and the three-dimensional B model, guides the adjustment and eliminates the deviation, and repeats the above process until the two are completely matched, thereby ensuring the overall tying accuracy of the steel bar segments to be installed, greatly improving work efficiency, effectively reducing the time of construction personnel working at heights, reducing safety risks, meeting the needs of rapid construction of tall columns, and having good economic and social benefits.

[0030] Compared with the single lifting and binding method in the prior art, the installation method of steel bar segments in tall columns of the present application can better meet the needs of rapid construction and greatly improve work efficiency. Compared with the prior art of overall binding according to the design drawings in the back field and then directly lifting and assembling, the installation method of steel bar segments in tall columns of the present application greatly improves construction accuracy, reduces installation difficulty, and improves construction efficiency. Compared with the prior art of using total stations and other equipment to collect reserved steel bars in advance after the construction of the cast column segments is completed, and then going to the back field to overall bind the steel bar segments to be installed; the installation method of steel bar segments in tall columns of the present application obtains the reserved steel bar model and binds the steel bar segments to be installed at the same time, which is more efficient than the above-mentioned prior art of first collecting the reserved steel bars and then overall binding the steel bar segments to be installed. It can better meet the requirements of rapid construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 A schematic diagram of obtaining a three-dimensional A model of a cast column segment and reserved reinforcement provided in an embodiment of the present application;

[0033] Figure 2 Establishing an independent control network in the steel reinforcement site provided in the embodiment of the present application;

[0034] Figure 3 A top view of a steel bar segment to be installed provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of obtaining a three-dimensional B model of a steel bar segment to be installed provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of pre-matching the three-dimensional A model and the three-dimensional B model provided in an embodiment of the present application;

[0037] Figure 6 A matching diagram of the three-dimensional A model and the three-dimensional B model after deviation adjustment provided in an embodiment of the present application;

[0038] Figure numerals: 1. three-dimensional model A; 2. three-dimensional model B; 10. steel bar segment to be installed; 11. target; 12. control point; 21. deviation steel bar. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present application clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] like Figures 1 to 5 As shown, the present application discloses a method for installing a steel bar segment in a tall column, comprising the steps of:

[0041] The three-dimensional scanning device collects three-dimensional data of the embedded steel bars of the cast column segment and establishes a three-dimensional A model 1, that is, converts the embedded steel bars of the cast column segment from a physical device into a virtual model. The solid steel bar segment 10 to be installed is tied according to the design drawing, and the three-dimensional scanning device scans the solid steel bar segment 10 to be installed and establishes a virtual three-dimensional B model 2. The three-dimensional B model 2 is a three-dimensional model obtained based on the shape of the actual steel bar segment 10 to be installed, which is different from the design drawing of the steel bar segment 10 to be installed.

[0042] The three-dimensional B model 2 is virtually matched with the three-dimensional A model 1, and the deviation steel bars 21 that appear in the three-dimensional B model 2 relative to the three-dimensional A model 1 are marked, and the deviation data is output. Specifically, the deviation data includes the size deviation of the steel bar itself and the position deviation of the steel bar. Then, according to the deviation data, the actual steel bar segment 10 to be installed is updated. If the size of the steel bar itself is incorrect, the size is corrected. If the installation position of the steel bar is inaccurate, the installation position of the steel bar is corrected. After adjusting the steel bar segment 10 to be installed, the three-dimensional scanning device re-establishes the three-dimensional B model 2 for the steel bar segment 10 to be installed, updates the three-dimensional B model 2; and the three-dimensional B model 2 is virtually matched with the three-dimensional A model 1 again.

[0043] Repeat the updating of the steel bar segment 10 to be installed and the three-dimensional B model 2 until the three-dimensional B model 2 is completely matched with the three-dimensional A model 1, and the adjustment of the steel bar segment 10 to be installed is completed. The steel bar segment 10 to be installed is hoisted above the embedded steel bars of the cast column segment for physical alignment installation.

[0044] The installation method of steel bar segments in tall columns of the present application uses the embedded steel bars of the cast column segments as the basis of the steel bar segments 10 to be installed. During the construction process, the embedded steel bars are affected by external factors such as binding accuracy, concrete pouring and vibration, and their three-dimensional posture has changed, and there is a certain deviation from the original design drawings of the embedded steel bars. A three-dimensional scanning device is used to collect the three-dimensional posture data of the embedded steel bars in the cast column segments, which can quickly obtain the true three-dimensional posture of the embedded steel bars and establish a true three-dimensional A model 1, providing a reliable basis for the adjustment of the steel bar segments 10 to be installed.

[0045] What is important is that establishing the three-dimensional A model 1 and tying the steel bar segments 10 to be installed and establishing the three-dimensional B model 2 are completely independent of each other and can be performed separately, which greatly saves time and meets the requirements of rapid construction.

[0046] The installation method of steel bar segments in tall columns of the present application takes the three-dimensional A model 1 as a reference, first ties the actual steel bar segments 10 to be installed according to the design drawings, establishes a three-dimensional B model 2 according to the steel bar segments 10 to be installed, and finds the deviation steel bars 21 and deviation data through matching the three-dimensional A model 1 and the three-dimensional B model 2, guides the adjustment and eliminates the deviation, and repeats the above process until the two are completely matched, thereby ensuring the overall tying accuracy of the steel bar segments 10 to be installed, greatly improving work efficiency, effectively reducing the time of construction personnel working at heights, reducing safety risks, meeting the needs of rapid construction of tall columns, and having good economic and social benefits.

[0047] Compared with the single lifting and tying method in the prior art, the installation method of the steel bar segments in the tall column of the present application can better meet the needs of rapid construction and greatly improve the work efficiency. Compared with the prior art of tying the whole in the back field according to the design drawings and then directly lifting and assembling, the installation method of the steel bar segments in the tall column of the present application greatly improves the construction accuracy, reduces the installation difficulty, and improves the construction efficiency.

[0048] Compared with the prior art, after the construction of the cast column segment is completed, the total station and other equipment are used to collect the reserved steel bars in the early stage, and then go to the back field to tie the steel bar segment 10 to be installed as a whole according to the collected coordinates; the installation method of the steel bar segment in the tall column of the present application obtains the reserved steel bar model and ties the steel bar segment 10 to be installed at the same time, which is more efficient than the above-mentioned prior art that collects the reserved steel bars first and then ties the steel bar segment 10 to be installed as a whole, and can better meet the requirements of rapid construction. It is worth noting that the steel bar segment 10 to be installed is tied according to the design drawings first, and then adjusted slowly. There is no need to worry about being too large. If the adjustment amount is very large, it means that the casting of the previous column segment is unqualified. On the contrary, as long as the casting of the previous column segment is qualified, the amount of adjustment in the later stage is compared with the prior art that the entire steel bar segment 10 to be installed is tied as a whole after the reserved steel bar measurement is completed. The workload is greatly reduced, the time required is shorter, and the efficiency is higher. In the actual work process, a 30-meter tall column can be installed one month earlier using the installation method of the present application compared to the prior art.

[0049] like Figure 1 As shown, in one embodiment, a three-dimensional scanning device collects three-dimensional data of embedded steel bars and establishes a three-dimensional A model 1, including:

[0050] Four targets 11 are placed on the embedded steel bars to highlight the conspicuous points. The three-dimensional scanning device scans the embedded steel bars in sections. The adjacent section scans cover at least two identical targets 11 as common reference points. All scanning results are spliced ​​to form a three-dimensional A model 1. In the splicing process, the repeated parts can be directly overlapped.

[0051] Specifically, the cross-sectional dimensions of tall columns are generally large, and there are many embedded steel bars, which may not be completely scanned in one scan. The introduction of the target 11 facilitates the scanning of the partitions before splicing, and the target 11 serves as a reference point for the splicing process.

[0052] In other embodiments, if the cross-sectional size of the tall column is not particularly large, the scanning can also be completed in one time.

[0053] Specifically, the number of partitions is divided according to the size and density of the steel bar segments 10 to be installed.

[0054] Furthermore, the four targets 11 are distributed in a parallelogram shape, that is, the lines connecting the adjacent targets 11 form a parallelogram shape. The height of each target 11 exceeds the height of all embedded steel bars, and the protruding targets 11 are convenient for subsequent use as references.

[0055] Furthermore, the embedded steel bars are scanned in sections and spliced ​​to form a three-dimensional A model 1, including:

[0056] All the three-dimensional data collected from different areas are transmitted to the central processing unit, and the central processing unit uses the target 11 as a common reference point to perform splicing and establish a three-dimensional A model 1 of the embedded steel bars.

[0057] Preferably, the three-dimensional scanning device scans the embedded steel bars in four areas, each area corresponding to one side of the parallelogram formed by the target 11 .

[0058] In one embodiment, the steel bar segment 10 to be installed is tied according to the design drawing, and a three-dimensional B model 2 is established for the steel bar segment 10 to be installed using a three-dimensional scanning device, including:

[0059] Prefabricate the steel bars to be constructed for the column segments to be cast according to the design drawings, and tie them up as a whole to form steel bar segments to be installed 10;

[0060] In the steel bar processing site, several 3D scanning devices are installed at fixed points and directions to establish an independent control network covering a certain range;

[0061] The steel bar segment 10 to be installed is hoisted into the independent control network, and a plurality of three-dimensional scanning devices collect and splice the data to obtain a three-dimensional B model 2.

[0062] Specifically, several three-dimensional scanning devices of the independent control network can scan and cover the entire steel bar segment 10 to be installed.

[0063] The installation method of steel bar segments in tall columns of the present application sets up an independent control network, which can be established once and reused, has low overall cost, can scan each steel bar segment 10 to be installed, improves modeling efficiency, and further improves overall construction efficiency.

[0064] like Figure 2 As shown, further, an independent control network covering a certain range is established, and a number of three-dimensional scanning devices collect and splice to obtain a three-dimensional B model 2, including:

[0065] Establishing a coordinate system of an independent control network, which is different from the coordinate system of the design drawings and is specifically used off-site; setting a number of control points 12 with known coordinates, and the control points 12 are used to install a three-dimensional scanning device;

[0066] Each three-dimensional scanning device independently scans and obtains partial three-dimensional coordinates of the steel bar segment 10 to be installed, and splices them to obtain a three-dimensional B model 2.

[0067] Preferably, the three-dimensional coordinates of the control point 12 are measured in advance by a total station and a level.

[0068] Furthermore, the steel bar processing site also includes a support frame for supporting the steel bar segment 10 to be installed and a hoist for hoisting the steel bar segment 10 to be installed. The steel bar processing site is set up once and can be reused.

[0069] Preferably, the number of control points 12 is 4, and the 4 control points 12 also form a parallelogram.

[0070] Furthermore, the three-dimensional B model 2 is virtually matched with the three-dimensional A model 1, and the deviation steel bars 21 appearing in the three-dimensional B model 2 are marked and the deviation data is output, including:

[0071] The deviation steel bars 21 are color-marked based on the adjacent control points 12. After marking, the corresponding deviation steel bars 21 are found in the actual steel bar segments 10 to be installed and corrected.

[0072] In one embodiment, the three-dimensional scanning device adopts a three-dimensional laser scanner. In another embodiment, the three-dimensional scanning device can also adopt a close-range photogrammetry instrument.

[0073] To sum up, the installation method of steel bar segments in tall columns of the present application is different from the measurement scheme in the prior art. It innovatively uses a three-dimensional laser scanner or a close-range photogrammeter to model the embedded steel bar entity of the cast column segment to obtain a three-dimensional A model 1. Through matching and comparison of the three-dimensional A model 1 and the three-dimensional B model 2, data support is provided for the three-dimensional posture adjustment of the steel bar segment 10 to be installed after the binding is completed, and the deviation adjustment of the steel bar segment 10 to be installed is guided, thereby ensuring the accuracy of the overall prefabrication of the steel bar segment 10 to be installed, and constructing a complete set of accurate and efficient quality control schemes for the overall installation of steel bar segments, thereby improving the efficiency of steel bar binding in tall column construction, reducing the time of personnel working at high altitudes, breaking through the bottleneck of rapid construction of tall columns, and bringing good economic and social benefits.

[0074] 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.

[0075] 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.

[0076] The above description is only a specific embodiment 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 installing steel bar segments in a tall column, characterized in that: Includes steps: The three-dimensional scanning device collects three-dimensional data of the cast column segment and its embedded steel bars, and establishes a three-dimensional A model (1); the steel bar segment to be installed (10) is tied according to the design drawing, and the three-dimensional scanning device is used to establish a three-dimensional B model (2) of the steel bar segment to be installed (10); The three-dimensional B model (2) is virtually matched with the three-dimensional A model (1), and the deviation steel bars (21) appearing in the three-dimensional B model (2) are marked and deviation data is output; according to the deviation data, the steel bar segment to be installed (10) and the three-dimensional B model (2) are updated, and the virtual matching is performed again; Repeatedly updating the steel bar segment to be installed (10) and the three-dimensional B model (2) until the three-dimensional B model (2) is completely matched with the three-dimensional A model (1) and the adjustment of the steel bar segment to be installed (10) is completed; the steel bar segment to be installed (10) is hoisted to the top of the embedded steel bars of the cast column segment and installed in position; The steel bar segment (10) to be installed is tied according to the design drawing, and a three-dimensional B model (2) is established for the steel bar segment (10) to be installed using a three-dimensional scanning device, including: Prefabricate steel bars according to the design drawings and tie them together as a whole to form steel bar segments to be installed (10); In the steel bar processing site, several 3D scanning devices are installed at fixed points and directions to establish an independent control network covering a certain range; The steel bar segment (10) to be installed is hoisted into an independent control network, and a plurality of three-dimensional scanning devices collect and splice the data to obtain a three-dimensional B model (2); Establish an independent control network covering a certain range, including: Establishing a coordinate system of an independent control network, setting a number of control points (12) with known coordinates, the control points (12) being used to install a three-dimensional scanning device; Each three-dimensional scanning device independently scans and obtains partial three-dimensional coordinates of the steel bar segment (10) to be installed, and splices them to obtain a three-dimensional B model (2); The deviation steel bar (21) appearing in the three-dimensional B model (2) is marked and the deviation data is output, including: Using the adjacent control point (12) as a reference, the deviation steel bar (21) is color-marked; According to the deviation data, the steel bar segment to be installed (10) and the three-dimensional B model (2) are updated, including: if the size of the steel bar itself is incorrect, the size is corrected; if the steel bar installation position is inaccurate, the installation position of the steel bar is corrected; and after adjusting the steel bar segment to be installed (10), the three-dimensional B model (2) is rebuilt.

2. A method for installing a steel bar segment in a tall column as claimed in claim 1, characterized in that: The three-dimensional scanning device collects three-dimensional data of the embedded steel bars and establishes a three-dimensional A model (1), including: Four targets (11) are placed on the embedded steel bars, and a three-dimensional scanning device scans the embedded steel bars in sections. The adjacent section scans cover at least two identical targets (11) as common reference points, and all scanning results are spliced ​​to form a three-dimensional A model (1).

3. A method for installing a steel bar segment in a tall column as claimed in claim 2, characterized in that: The four targets (11) are distributed in a parallelogram shape, and the height of each target (11) exceeds the height of all embedded steel bars.

4. A method for installing a steel bar segment in a tall column as claimed in claim 2, characterized in that: Scan the embedded steel bars in sections and splice them together to form a three-dimensional A model (1), including: All the three-dimensional data collected from different areas are transmitted to the central processing unit, which uses the target (11) as a common reference point to perform splicing and establish a three-dimensional A model (1) of the embedded steel bars.

5. A method for installing steel bar segments in a tall column as claimed in claim 1, characterized in that: The steel bar processing site also comprises a support frame for supporting the steel bar segment (10) to be installed and a hoisting device for hoisting the steel bar segment (10) to be installed.

6. A method for installing a steel bar segment in a tall column as claimed in claim 1, characterized in that: The number of the control points (12) is 4, and the 4 control points (12) form a parallelogram.

7. A method for installing a steel bar segment in a tall column according to any one of claims 1 to 6, characterized in that: The three-dimensional scanning device adopts a three-dimensional laser scanner and a close-range photography measuring instrument.

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