CN113374179B - Detachable steel bar supporting device and using method - Google Patents
Detachable steel bar supporting device and using method Download PDFInfo
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- CN113374179B CN113374179B CN202110655946.1A CN202110655946A CN113374179B CN 113374179 B CN113374179 B CN 113374179B CN 202110655946 A CN202110655946 A CN 202110655946A CN 113374179 B CN113374179 B CN 113374179B
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- steel bar
- supporting
- reinforcing steel
- support
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a detachable steel bar supporting device and a using method thereof, and the detachable steel bar supporting device comprises a supporting tube, a steel bar supporting component, an adjusting component, a spring piece, a bearing seat and an inserting block, wherein the adjusting component, the spring piece and the bearing seat are arranged in the supporting tube, the inserting block is connected with the supporting tube in a sliding manner, one end of the spring piece is connected with the bearing seat, the other end of the spring piece penetrates through the adjusting component and is connected with the inserting block, the steel bar supporting component is sleeved on the supporting tube, and during work, the inserting block penetrates through the supporting tube and is connected with the steel bar supporting component. The invention belongs to the technical field of constructional engineering, and aims to solve the problem that a supporting steel bar cannot be recycled in the prior art. The technical effects achieved are as follows: the device has simple structure and lower cost, realizes the repeated use and the effective control of the thickness of the steel bar protective layer, and saves a large amount of materials.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a detachable reinforcing steel bar supporting device and a using method of the detachable reinforcing steel bar supporting device.
Background
For a long time, the traditional mode of on-site reinforcing steel bar processing and manufacturing is mainly adopted by the supporting reinforcing steel bar in the building industry of China. Before a building floor slab is cast and formed, two layers of reinforcing steel bar meshes need to be erected above a construction template to serve as a framework of the floor slab, and in the erecting process of the reinforcing steel bar meshes, in order to fix an upper layer of reinforcing steel bar meshes, a common method is to place supporting reinforcing steel bars on the construction template and then place the upper layer of reinforcing steel bar meshes on placed reinforcing steel bar supports, so that the upper layer of reinforcing steel bar meshes are fixed. When concrete is poured, the upper and lower layers of reinforcing mesh of the supporting reinforcing steel bars are buried in the concrete together, so that the supporting reinforcing steel bars cannot be recycled, and the waste of reinforcing steel bar materials is further caused.
Disclosure of Invention
Therefore, the present invention provides a detachable reinforcing bar supporting device to solve the above problems in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
according to the first aspect of the invention, the detachable reinforcing steel bar supporting device comprises a supporting tube, a reinforcing steel bar supporting assembly, an adjusting assembly, a spring piece, a bearing seat and an inserting block, wherein the adjusting assembly, the spring piece and the bearing seat are arranged in the supporting tube, the inserting block is connected with the supporting tube in a sliding mode, one end of the spring piece is connected with the bearing seat, the other end of the spring piece penetrates through the adjusting assembly and is connected with the inserting block, the reinforcing steel bar supporting assembly is sleeved on the supporting tube, and during operation, the inserting block penetrates through the supporting tube and is connected with the reinforcing steel bar supporting assembly.
Furthermore, the reinforcing steel bar supporting component comprises a reinforcing steel bar support and a reinforcing steel bar bracket, the reinforcing steel bar support is sleeved on the supporting tube, the reinforcing steel bar bracket is arranged on the surface of the reinforcing steel bar support, which deviates from the supporting tube, and the inserting block penetrates through the supporting tube and is clamped with the reinforcing steel bar support in operation.
Furthermore, the adjusting component comprises a buckle, a shaft and a lifting platform, one end of the shaft is connected with one end of the lifting platform, the other end of the shaft penetrates through the buckle to be connected with the bearing seat in a vertically sliding mode, and the spring piece is inserted into the buckle.
Furthermore, the supporting tube comprises an upper tube portion and a lower tube portion, the upper tube portion is in threaded connection with the lower tube portion, the bearing seat is installed in an accommodating cavity of the lower tube portion, the reinforcing steel bar support is sleeved on the upper tube portion, and the inserting block is in sliding connection with the upper tube portion.
Further, still include the cushion, during operation, the one end that the lower tube portion deviates from the upper tube portion is inserted and is established on the cushion.
Furthermore, the adjusting component also comprises a connecting rod, and one end of the connecting rod penetrates through the supporting tube to be connected with one end of the lifting platform back off-axis.
Further, still include the handle, the handle is installed to the one end that the connecting rod deviates from the elevating platform.
Further, the shape of the lifting platform is a circular truncated cone.
Furthermore, the cross-sectional shape of reinforcing bar bracket is "U" font.
According to a second aspect of the present invention, a method for using a removable reinforcing bar supporting apparatus, the removable reinforcing bar supporting apparatus of the first aspect of the present invention, comprises the following steps:
s100, placing a cushion block;
s200, mounting a detachable reinforcing steel bar supporting device, and binding an upper layer reinforcing mesh and a lower layer reinforcing mesh;
step S300, pouring concrete;
step S400, pulling out the components except the cushion block, the reinforcing steel bar support and the reinforcing steel bar support before the concrete is solidified;
and S500, grouting and plugging the hole.
In the process of binding the face steel bars, a cushion block is placed at the junction of the transverse steel bars and the longitudinal steel bars at the bottom of the plate, and the detachable steel bar supporting device needs to ensure that the steel bar supporting plate is positioned at the junction of the transverse steel bars and the longitudinal steel bars when being installed; after the concrete is poured and before the concrete is not initially set, the handle is pulled out upwards to leave the reinforcing steel bar support and the reinforcing steel bar support in the concrete, and other frame bodies are recycled and reused.
When the device is used, the handle is pressed down to enable the buckle on the shaft to move downwards to control the spring piece to do expansion movement, at the moment, the insert block is inserted into the reserved clamping hole on the reinforcing steel bar support, and the reinforcing steel bar support does not need to be bound and fixed to realize self-clamping fixation and is not easy to run; the extraction process of the device is that constructors hold the handle to move upwards, the shaft buckle drives the spring piece to do inward contraction movement, the inserting block also contracts to enter the supporting rod to be separated from the reinforcing steel bar support, the constructors can extract the device from concrete which is not finally set upwards by upwards extraction, and then the recycling value is achieved.
The invention has the following advantages: this device simple structure, cost are lower, have realized simultaneously that need not to stranded to steel bar support device and prick fixedly, have realized steel bar support device's fixing and difficult emergence position change and having realized used repeatedly from the card through setting up of adjusting part and inserted block, make this device realize the thickness of effective control reinforcing bar protective layer through setting up of steel bar support component, have practiced thrift a large amount of materials.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary and that other implementation drawings may be derived from the provided drawings by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a first cross-sectional view of a removable rebar support device according to some embodiments of the present invention.
Fig. 2 is a first view of a removable rebar support device according to some embodiments of the present invention.
Fig. 3 is an exploded view of a removable rebar support device according to some embodiments of the present invention.
Fig. 4 is a second cross-sectional view of a removable reinforcing bar support apparatus according to some embodiments of the present invention.
Fig. 5 is a third cross-sectional view of a removable reinforcing bar supporting device according to some embodiments of the present invention.
Fig. 6 is a fourth cross-sectional view of a removable reinforcing bar support apparatus according to some embodiments of the present invention.
Fig. 7 is a state diagram of a removable rebar support device according to some embodiments of the present invention in use.
Fig. 8 is a drawing illustrating a state of the removable reinforcing bar supporting device according to some embodiments of the present invention.
Fig. 9 is a cross-sectional view of a removable rebar support device according to some embodiments of the present invention without casting the removable rebar support device when installed on a base slab.
Fig. 10 is a top view of a removable rebar support device mounted on floor rebar according to some embodiments of the present invention.
In the figure: 1. the lifting device comprises a handle, 2, a connecting rod, 3, a steel bar support, 4, a through hole, 5, a spring piece, 6, a buckle, 7, a bearing seat, 9, a lifting platform, 10, an inserting block, 11, a steel bar support seat, 12, an upper pipe, 13, a shaft, 14, a lower pipe, 15 and a cushion block.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 10, in an embodiment of the first aspect of the present invention, a detachable reinforcing bar supporting device includes a supporting tube, a reinforcing bar supporting assembly, an adjusting assembly, a spring plate 5, a bearing seat 7, and an insert 10, the adjusting assembly, the spring plate 5, and the bearing seat 7 are disposed in the supporting tube, the insert 10 is slidably connected to the supporting tube, one end of the spring plate 5 is connected to the bearing seat 7, the other end of the spring plate 5 passes through the adjusting assembly to be connected to the insert 10, the reinforcing bar supporting assembly is sleeved on the supporting tube, and during operation, the insert 10 passes through the supporting tube to be connected to the reinforcing bar supporting assembly.
In the above embodiment, it should be noted that, preferably, the support tube is a galvanized tube, the reinforcing steel bar support assembly includes a reinforcing steel bar support seat, a through hole 4 is formed in a side wall of the support tube, the insert block 10 slides in the through hole 4, and the number of the spring pieces 5 is at least two; preferably, the bar support assembly comprises a bar support 3 and a bar receptacle 11.
The working principle of the device is as follows: during the use, the adjustment assembly work drives spring leaf 5 and is the expanding motion, 5 expanding motions of spring leaf drive inserted block 10 and remove until the inserted block inserts reinforcing bar supporting component, guarantee that reinforcing bar supporting component can not remove at will, after concreting, before the concrete solidifies, adjustment assembly work drives spring leaf 5 and is the shrink motion, drive inserted block 10 and remove for inserted block 10 contracts in through-hole 4, then once extracts this device except that the part of reinforcing bar supporting component.
The technical effects achieved by the above embodiment are as follows: this device simple structure, cost are lower, have realized simultaneously that need not to stranded to steel bar support device and prick fixedly, have realized steel bar support device's fixing and difficult emergence position change and have realized used repeatedly from the card through setting up of adjusting part and inserted block 10, make this device realize the thickness of effective control reinforcing bar protective layer through steel bar support component's setting, have practiced thrift a large amount of materials.
Optionally, as shown in fig. 1 to 10, in some embodiments, the reinforcing bar support assembly includes a reinforcing bar support 3 and a reinforcing bar bracket 11, the reinforcing bar support 3 is sleeved on the support tube, the reinforcing bar bracket 11 is disposed on a side of the reinforcing bar support 3 away from the support tube, and in operation, the insert 10 passes through the support tube and is clamped with the reinforcing bar support 3.
In the above optional embodiment, it should be noted that, preferably, the cross-sectional shape of the steel bar support 3 is a circular ring, a clamping groove is formed in a side wall of the steel bar support 3, when in use, the insertion block 10 is inserted into the clamping groove to clamp the steel bar support 3, and the steel bar bracket 11 is welded or connected to the steel bar support 3 through a bolt.
Specifically, the shape and size of the slot on the steel bar support 3 are the same as those of the insert block 10.
The beneficial effects of the above alternative embodiment are: the arrangement of the reinforcing steel bar support 3 and the reinforcing steel bar bracket 11 can ensure that the reinforcing steel bars needing to be supported, namely the gluten, are reliably supported, and further the thickness of the reinforcing steel bar protective layer is effectively controlled.
Alternatively, as shown in fig. 1 and 5 to 10, in some embodiments, the adjusting assembly includes a buckle 6, a shaft 13 and a lifting platform 9, one end of the shaft 13 is connected with one end of the lifting platform 9, the other end of the shaft 13 passes through the buckle 6 to be connected with the bearing seat 7 in a sliding manner up and down, and the spring piece 5 is inserted on the buckle 6.
In the above optional embodiment, it should be noted that, preferably, the number of the spring pieces 5 is at least two, at least one spring piece 5 is inserted at both ends of the buckle 6, and the buckle 6 can move up and down relative to the spring piece 5; the middle part of the bearing seat 7 is provided with a shaft hole, and the shaft 13 is inserted in the shaft hole; the buckle 6 is connected to the shaft 13 through a bolt, the lifting platform 9 is in a round table shape, one end with a larger diameter is close to the top of the supporting tube, the other end with a smaller diameter is connected with the shaft 13, the top and the bottom of the supporting tube are both in a blocking state, a round hole is formed in the top of the supporting tube, and the diameter of the round hole in the top of the supporting tube is smaller than the maximum diameter of the lifting platform 9; when the device works, the buckle 6 is abutted against the bearing seat 7.
The beneficial effects of the above alternative embodiment are: the shaft 13 penetrates through the buckle 6 and the bearing seat 7 to be connected with each other in a vertical sliding mode, so that the adjusting assembly can reliably move up and down, and the position of the spring piece 5 can be reliably adjusted.
Alternatively, as shown in fig. 1 and 7 to 10, in some embodiments, the support tube includes an upper tube portion 12 and a lower tube portion 14, the upper tube portion 12 is screwed with the lower tube portion 14, the load bearing seat 7 is installed in the receiving cavity of the lower tube portion 14, the steel bar bracket 3 is sleeved on the upper tube portion 12, and the insert 10 is slidably connected with the upper tube portion 12.
In the above-mentioned alternative embodiment, it should be noted that the sidewall of the upper tube portion 12 is opened with a through hole 4, and the insert block 10 is inserted into the through hole 4 and slidably connected with the upper tube portion 12.
The beneficial effects of the above alternative embodiment are: the device can be conveniently processed and assembled by the arrangement of the threaded connection of the upper pipe part 12 and the lower pipe part 14.
Optionally, as shown in fig. 1 and 7-10, in some embodiments, a spacer 15 is further included, and in operation, an end of the lower tubular portion 14 facing away from the upper tubular portion 12 is inserted over the spacer 15.
In the above alternative embodiment, it should be noted that, preferably, the center of the cushion block 15 is provided with a groove, and the down pipe portion 14 is inserted into the groove.
The beneficial effects of the above alternative embodiment are: the arrangement of the cushion block 15 can ensure that the device is reliably supported, and the conditions of inclination and the like of the device are avoided.
Optionally, as shown in fig. 1 and 7-10, in some embodiments, the adjustment assembly further comprises a connecting rod 2, and one end of the connecting rod 2 passes through the support tube to be connected with one end of the lifting table 9 facing away from the shaft 13.
In the above alternative embodiment, it should be noted that the shape of the connecting rod 2 is rectangular, circular, or oval.
The beneficial effects of the above alternative embodiment are: the up-down movement of the lifting platform 9 can be directly controlled from the top through the arrangement of the connecting rod 2 so as to control the movement of the buckle 6, and the expansion and contraction of the adjusting spring piece 5 are realized through the movement of the buckle 6 so as to control the position of the insert block 10.
Optionally, as shown in fig. 1 and fig. 7 to 10, in some embodiments, a handle 1 is further included, and the handle 1 is mounted on an end of the connecting rod 2 facing away from the lifting platform 9.
In the above alternative embodiment, it should be noted that the connection mode of the handle 1 and the connecting rod 2 is a bolt connection mode or a welding connection mode.
The beneficial effects of the above alternative embodiment are: the lifting of the lifting platform 9 can be easier through the arrangement of the handle 1.
Alternatively, as shown in fig. 1 and 7-10, in some embodiments, the shape of the lift table 9 is a circular truncated cone.
In the above alternative embodiment, it should be noted that the end of the elevator platform 9 with the larger diameter is close to the top of the upper pipe portion 12.
The beneficial effects of the above alternative embodiment are: the arrangement of the lifting table 9 in the shape of a circular truncated cone can ensure that the insert 10 fixes the insert 10 when the reinforcing steel bar support 3 is clamped, so that the position of the insert 10 is ensured not to move, and the position of the reinforcing steel bar support 3 is ensured to be reliably fixed finally.
Alternatively, as shown in fig. 1 to 4 and 7 to 10, in some embodiments, the cross-sectional shape of the rebar bracket 11 is "U" shaped.
The beneficial effects of the above alternative embodiment are: the arrangement that the cross-sectional shape through reinforcing bar bracket 11 is "U" font can make the gluten reliably fix on this strutting arrangement.
The method for using a removable reinforcing bar supporting device according to the second aspect of the present invention, which uses all the technical features of the removable reinforcing bar supporting device according to the first aspect of the present invention, includes the following steps:
s100, placing a cushion block 15;
s200, mounting a detachable reinforcing steel bar supporting device, and binding an upper layer reinforcing mesh and a lower layer reinforcing mesh;
step S300, pouring concrete;
step S400, pulling out the components except the cushion block 15, the reinforcing steel bar support 3 and the reinforcing steel bar support 11 before the concrete is solidified;
and S500, grouting and plugging the hole.
In the above embodiment, it should be noted that the working principle of each component of the present invention is that, in the process of binding the steel bars on the board surface, the cushion block 15 is placed down at the junction between the steel bars at the bottom of the board and the longitudinal steel bars, and the detachable steel bar supporting device needs to ensure that the steel bar supporting plate 3 is located at the junction between the transverse steel bars and the longitudinal steel bars of the gluten when being installed; after concrete is poured and before the concrete is not initially set, the handle 1 is pulled out upwards to leave the reinforcing steel bar support 3 and the reinforcing steel bar support 11 in the concrete, and other frame bodies are recycled and reused.
When the device is used, the handle 1 is pressed downwards to enable the buckle 6 on the shaft 14 to move downwards to control the spring piece 5 to do expansion movement, at the moment, the inserting block 10 is inserted into a reserved clamping hole on the reinforcing steel bar support 3, and the reinforcing steel bar support 11 is not required to be bound and fixed to realize self-clamping fixation and is not easy to run; the extraction process of the device is that a constructor holds the handle 1 to move upwards, the buckle 6 on the shaft 12 drives the spring piece 5 to do inward contraction movement, the inserting block 10 also contracts to enter the supporting rod to be separated from the reinforcing steel bar support 3, and the constructor can extract the device from concrete which is not finally solidified by upwards extraction, so that the recycling value is achieved.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial changes in the technical content.
Claims (8)
1. A detachable reinforcing steel bar supporting device is characterized by comprising a supporting pipe, a reinforcing steel bar supporting component, an adjusting component, a spring piece (5), a bearing seat (7) and an insert block (10), wherein the adjusting component, the spring piece (5) and the bearing seat (7) are arranged in the supporting pipe, the insert block (10) is in sliding connection with the supporting pipe, one end of the spring piece (5) is connected with the bearing seat (7), the other end of the spring piece (5) penetrates through the adjusting component to be connected with the insert block (10), the reinforcing steel bar supporting component is sleeved on the supporting pipe and comprises a reinforcing steel bar support (3) and a reinforcing steel bar bracket (11), the reinforcing steel bar support (3) is sleeved on the supporting pipe, and the reinforcing steel bar bracket (11) is arranged on the side, away from the supporting pipe, of the reinforcing steel bar support (3), when the steel bar support is in work, the inserting block (10) penetrates through the support tube and is clamped with the steel bar support (3); the supporting tube comprises an upper tube part (12) and a lower tube part (14), the upper tube part (12) is in threaded connection with the lower tube part (14), the bearing seat (7) is installed in a containing cavity of the lower tube part (14), the steel bar support bracket (3) is sleeved on the upper tube part (12), the insert block (10) is in sliding connection with the upper tube part (12), and during operation, the insert block (10) penetrates through the supporting tube and is connected with the steel bar supporting component.
2. A removable reinforcing bar supporting device according to claim 1, wherein said adjusting assembly comprises a buckle (6), a shaft (13) and a lifting platform (9), one end of said shaft (13) is connected with one end of said lifting platform (9), the other end of said shaft (13) passes through said buckle (6) and is connected with said bearing seat (7) in a sliding manner up and down, and said spring piece (5) is inserted on said buckle (6).
3. A removable rebar support device according to claim 1 further comprising a spacer (15), wherein in operation an end of the down tube (14) remote from the up tube (12) is inserted over the spacer (15).
4. A removable rebar support device according to claim 2, wherein the adjustment assembly further comprises a connecting rod (2), one end of the connecting rod (2) passing through the support tube to connect with an end of the table (9) facing away from the shaft (13).
5. A removable rebar support according to claim 4, further comprising a handle (1), the handle (1) being mounted to an end of the connecting rod (2) facing away from the lifting platform (9).
6. A removable rebar support according to claim 2, wherein the platform (9) is frustoconical in shape.
7. A removable rebar support device as claimed in claim 1, wherein the rebar bracket (11) is "U" shaped in cross-section.
8. A method of using a removable rebar support device, using a removable rebar support device of any one of claims 1-7, comprising the steps of:
s100, placing a cushion block (15);
s200, mounting a detachable reinforcing steel bar supporting device, and binding an upper layer reinforcing mesh and a lower layer reinforcing mesh;
step S300, pouring concrete;
step S400, pulling out the components except the cushion block (15), the reinforcing steel bar support (3) and the reinforcing steel bar support (11) before the concrete is solidified;
and S500, grouting and plugging the hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110655946.1A CN113374179B (en) | 2021-06-11 | 2021-06-11 | Detachable steel bar supporting device and using method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110655946.1A CN113374179B (en) | 2021-06-11 | 2021-06-11 | Detachable steel bar supporting device and using method |
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| CN113374179A CN113374179A (en) | 2021-09-10 |
| CN113374179B true CN113374179B (en) | 2022-09-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4858488B2 (en) * | 2008-05-19 | 2012-01-18 | マックス株式会社 | Rebar binding machine |
| CN103243848B (en) * | 2013-05-13 | 2015-09-30 | 王惠滨 | The construction technology of cast-in-place concrete floor or superstructure and the spring support member of employing |
| CN211571243U (en) * | 2019-12-09 | 2020-09-25 | 延丽丽 | Highway bituminous paving crack repair structure |
| CN112079207A (en) * | 2020-04-27 | 2020-12-15 | 王蕊 | Textile bobbin positioning and winding control method |
| CN212534820U (en) * | 2020-05-20 | 2021-02-12 | 中天华南建设投资集团有限公司 | Height-adjustable can have enough to meet need formula reinforcing bar stirrup |
| CN112252594A (en) * | 2020-10-30 | 2021-01-22 | 浙江省三建建设集团有限公司 | Steel bar supporting device and construction method thereof |
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