CN109653445B - Thickness adjusting device and method for steel bar protection layer - Google Patents
Thickness adjusting device and method for steel bar protection layer Download PDFInfo
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- CN109653445B CN109653445B CN201910133667.1A CN201910133667A CN109653445B CN 109653445 B CN109653445 B CN 109653445B CN 201910133667 A CN201910133667 A CN 201910133667A CN 109653445 B CN109653445 B CN 109653445B
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- adjusting
- stirrup
- protective layer
- screw rod
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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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Abstract
The invention discloses a thickness adjusting device and a method of a steel bar protective layer, wherein the device comprises a plurality of support connecting rods (1), an adjustable sleeve (2), a hook connecting rod (3), an adjusting screw rod (4), an adjusting handle (5), a pair of positioning blocks (7), a beam support rib (8) and an adjusting nut (12); an external corner (71) is arranged at the bottom of the positioning block (7) and clamped between the stirrup (10) and the template (9) to form a side protective layer; the beam support rib penetrates through the stirrup, the stirrup is hung on the beam support rib through the beam upper rib (6), the beam support rib is placed on the positioning block, and a bottom protective layer is formed between the stirrup and the template; the support connecting rod is connected with the template and the adjustable sleeve, the adjusting handle is arranged on the adjustable sleeve through the adjusting nut and drives the adjusting screw rod to move up and down, the hook connecting rod is connected with the adjusting screw rod, and the stirrup is hung on the hook connecting rod through the rib hook on the upper part of the beam and moves synchronously with the adjusting screw rod. The invention can adjust the thickness of the protective layer, so that the reinforcing steel bar protective layer meets the construction requirements.
Description
Technical Field
The invention relates to a construction device and a construction method for a steel bar protection layer, in particular to a thickness adjusting device and a thickness adjusting method for the steel bar protection layer.
Background
The reinforced concrete beam is used as an independent beam, or forms an integral beam-plate type floor with the reinforced concrete slab, or forms an integral single-layer or multi-layer frame with the reinforced concrete column, and is widely applied to the construction of building engineering.
At present, before the construction of a reinforced concrete beam frame, a cast-in-place plate is formed by pouring through a template, the reinforced concrete beam frame is hoisted into the template, and a stirrup is vertically connected with the cast-in-place plate, so that a pouring gap of a reinforcing steel bar protective layer is reserved between the stirrup and the template. The reinforced concrete beam frame of prior art is through the interval of filling up the mode control stirrup bottom of establishing the cement cushion and template in the bottom, is located the thickness of the protective layer of reinforcing bar of bottom promptly, if the roof beam frame in the reinforced concrete beam of prior art is great, heavier, hardly fills up on its lower template and establishes the cement cushion, and the operation degree of difficulty is big, and workman's ligature reinforcing bar also is after having erect the take the altitude, treats the ligature good, and the reconcentration is pricked on the roof beam frame. The sudden sinking of the beam frame of the reinforced concrete is usually caused by the factors that the strength of the cement cushion block is not high and the cement cushion block is easy to crush, the cement cushion block is not enough and the like, so that the steel bar touch phenomenon of the beam frame of the reinforced concrete is serious, the steel bar exposing phenomenon is easy to occur after the form is removed, and the beam frame does not meet the standard requirement of construction.
The thickness of the steel bar protection layer formed on the side between the two sides of the stirrup and the formwork in the construction process of the prior art is difficult to control. Under the condition that the beam steel bar of the reinforced concrete beam is in high environment humidity, the steel bar is easy to corrode, so that a large amount of manpower is required to be consumed for revisit and maintenance, the internal quality of concrete engineering construction is seriously influenced, and the maintenance and construction cost is increased.
Disclosure of Invention
The invention aims to provide a thickness adjusting device and method for a steel bar protective layer, which can effectively control the thickness of the steel bar protective layer and enable the steel bar protective layer to meet the construction requirements.
The invention is realized by the following steps:
a thickness adjusting device for a steel bar protective layer comprises a plurality of support connecting rods, an adjustable sleeve, a hook connecting rod, an adjusting screw rod, an adjusting handle, a pair of positioning blocks, a beam support rib and an adjusting nut; the bottoms of the pair of positioning blocks are respectively provided with an external corner, and the pair of positioning blocks are symmetrically arranged at the joint of the stirrup and the cast-in-place plate, so that the external corner is clamped between the outer side wall of the stirrup and the inner side wall of the template, and a side protective layer is formed between the side surface of the stirrup and the side surface of the template; the beam support rib penetrates through the upper end of the stirrup, the stirrup is hung on the beam support rib through the upper part rib of the beam, and two ends of the beam support rib are respectively placed on the pair of positioning blocks, so that the stirrup is placed between the pair of positioning blocks, and a bottom protective layer is formed between the bottom surface of the stirrup and the bottom surface of the template;
one end of each of the plurality of support connecting rods is respectively arranged on the template, the other end of each of the plurality of support connecting rods is concentrated and arranged on the loose sleeve, the loose sleeve is positioned above the template, and the adjusting screw rod penetrates through the loose sleeve; the adjusting nut is arranged at the top of the loose sleeve and is sleeved with the adjusting screw rod through threads, the adjusting handle is connected to the adjusting nut and drives the adjusting nut to rotate, so that the adjusting screw rod can move up and down along the loose sleeve; one end of the hook connecting rod is connected with the adjusting screw rod, and the other end of the hook connecting rod is in a hook shape, so that the stirrup can be hooked on the hook connecting rod through the rib at the upper part of the beam and can move up and down synchronously with the adjusting screw rod.
The width of the external corner is 20 mm.
The top of a pair of locating pieces be equipped with the constant head tank respectively, the roof beam brace rod can pass through the constant head tank location and inlay the dress on a pair of locating piece.
The longitudinal section of the positioning groove is of a semicircular structure matched with the beam supporting rib.
The positioning blocks are of a ladder platform structure with a narrow upper part and a wide lower part.
The adjustable sleeve is provided with a plurality of connectors, the support connecting rod is connected with the adjustable sleeve through the connectors, and the support connecting rod rotates around the connectors.
A thickness adjusting method of a steel bar protective layer comprises the following steps:
step 1: the support connecting rod is supported between the template and the adjustable sleeve, and the stirrup is hung in the template through the upper rib of the beam by the hook connecting rod;
step 2: the adjusting nut is rotated through the adjusting handle, the stirrup is driven to move up and down through the adjusting screw rod through the hook connecting rod, and the height of the stirrup is adjusted, namely the thickness of the bottom protective layer is adjusted;
and step 3: a pair of positioning blocks is arranged at the joint of the stirrup and the cast-in-place plate;
and 4, step 4: and placing the stirrups in the template through a pair of positioning blocks, and forming a side protective layer and a bottom protective layer between the stirrups and the template.
The step 4 comprises the following sub-steps:
step 4.1: hanging the stirrups on the pair of positioning blocks through beam supporting ribs, and forming a bottom protective layer at the bottoms of the stirrups;
step 4.2: the external corners of the pair of positioning blocks are clamped between the outer walls of the two sides of the stirrup and the inner walls of the two sides of the template, and a side part protective layer is formed between the two sides of the stirrup and the template.
The invention can effectively control the thickness of the protective layers at the bottom and two sides of the stirrup, so that the reinforcing steel bar protective layers meet the construction requirements, and the phenomena of exposed reinforcing steel bars and the like are avoided, thereby ensuring the structural stability and durability of the reinforced concrete beam.
Drawings
Fig. 1 is a sectional view of a thickness adjusting device for a steel bar protecting layer according to the present invention;
FIG. 2 is a side view of a positioning block of the thickness adjusting apparatus for a steel-bar protecting layer according to the present invention;
fig. 3 is a flow chart of a thickness adjusting method of a steel bar protection layer according to the present invention.
In the figure, a support connecting rod 1, a movable sleeve 2, a connector 21, a hook connecting rod 3, an adjusting screw rod 4, an adjusting handle 5, a beam upper rib 6, a positioning block 7, an external corner 71, a positioning groove 72, a beam support rib 8, a template 9, a stirrup 10, a cast-in-place plate 11 and an adjusting nut 12 are arranged.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to the attached figure 1, the thickness adjusting device for the steel bar protection layer comprises a plurality of support connecting rods 1, an adjustable sleeve 2, a hook connecting rod 3, an adjusting screw rod 4, an adjusting handle 5, a pair of positioning blocks 7, beam support ribs 8 and adjusting nuts 12; the bottom of a pair of locating piece 7 is equipped with external corner 71 respectively, and a pair of locating piece 7 symmetry sets up in the handing-over department of stirrup 10 and cast-in-place board 11, and external corner 71 chucking forms the lateral part protective layer between the lateral wall of stirrup 10 and the inside wall of template 9, can play better positioning action between the lateral surface of stirrup 10 and the lateral surface of template 9, has guaranteed the protective layer thickness of stirrup 10 both sides. Preferably, the width of the external corner 71 is 20mm, the thickness of the steel bar protection layers on two sides is 20mm, and the thickness of the side protection layers can be adjusted by changing the width of the external corner 71; the beam support rib 8 penetrates through the upper end of the stirrup 10, the stirrup 10 is hung on the beam support rib 8 through the beam upper rib 6, two ends of the beam support rib 8 are respectively placed on the pair of positioning blocks 7, the stirrup 10 is placed between the pair of positioning blocks, and a bottom protection layer is formed between the bottom surface of the stirrup 10 and the bottom surface of the template 9.
One end of each of the plurality of support connecting rods 1 is respectively arranged on the template 9, the other end of each of the plurality of support connecting rods 1 is concentrated and arranged on the loose sleeve 2, the loose sleeve 2 is positioned above the template 9, and the adjusting screw rod 4 penetrates through the loose sleeve 2; adjusting nut 12 sets up at loose sleeve 2's top and cup joints through the upper portion of screw thread with accommodate the lead screw 4, and adjusting handle 5 is connected on adjusting nut 12, and adjusting handle 5 drives adjusting nut 12 and rotates, because adjusting nut 12 supports the location on loose sleeve 2, and adjusting nut 12's circumferential direction changes the longitudinal movement who changes into accommodate the lead screw 4 through screw transmission, makes accommodate the lead screw 4 can reciprocate along loose sleeve 2, promptly: when the adjusting nut 12 is rotated, the adjusting screw rod 4 is lifted through the threads, so that the stirrup 10 below is driven to be adjusted upwards; when the adjusting nut 12 is rotated, the adjusting screw rod 4 descends through the thread, so that the stirrup 10 below is driven to be adjusted downwards. In the rotating process of the adjusting nut 12, due to the gravity action of the adjusting screw rod 4 and the stirrup 10, the adjusting nut 12 is always placed on the movable sleeve 2, and the stability of the adjusting nut 12 and the movable sleeve 2 is kept through the support connecting rod 1, so that the stirrup 10 can be stably adjusted up and down. One end of the hook connecting rod 3 is fixedly welded with the adjusting screw rod 4, and the other end of the hook connecting rod 3 is in a hook shape, so that the stirrup 10 can be hooked on the hook connecting rod 3 through the beam upper rib 6 and can move up and down synchronously with the adjusting screw rod 4, and the thickness of a protective layer at the bottom of the stirrup 10 is adjusted.
Referring to fig. 2, the positioning grooves 72 are respectively formed at the top of the pair of positioning blocks 7, the beam support rib 8 can be positioned and embedded on the pair of positioning blocks 7 through the positioning grooves 72, preferably, the cross section of the positioning groove 72 is semicircular and matched with the beam support rib 8, so that the beam support rib 8 can be matched with the shape of the beam support rib 8, and the positioning groove 72 is arranged along the length direction of the cast-in-place plate 11 and penetrates through the positioning blocks 7, so that the beam support rib 8 can be positioned through the positioning grooves 72, the placing stability of the beam support rib 8 is ensured, and the beam support rib.
The adjustable sleeve 2 is provided with a plurality of connectors 21, the support connecting rod 1 is connected with the adjustable sleeve 2 through the connectors 21, and the support connecting rod 1 rotates around the connectors 21, so that the rotation of the support connecting rod 1 in the lifting process is facilitated.
Preferably, 3 support connecting rods 1 can be adopted to form a triangular bracket to be supported between the template 9 and the adjustable sleeve 2, as shown in fig. 1, the support stability of the support connecting rods 1 is high; the pair of positioning blocks 7 are arranged according to the sizes of the stirrups 10 and the cast-in-place plate 11 and can be arranged at intervals of 1.5m, the positioning blocks 7 can adopt a ladder platform structure with a narrow top and a wide bottom, the sizes of the positioning blocks 7 can be arranged according to construction requirements, the width of the upper bottom of each positioning block 7 is 80-100mm, and the width of the lower bottom of each positioning block 7 is 144-150 mm; positioning a stirrup 10 in a template 9 through a pair of positioning blocks 7, and positioning two sides of the stirrup 10 through an external corner 71 to ensure that the thickness of side protective layers on the two sides is about 20mm, so that the construction requirements are met; the diameter of the positioning groove 72 is equal to that of the beam support rib 8 and is about 28mm, so that the top of the stirrup 10 is placed between the pair of positioning blocks 7 along the positioning groove 72 through the beam support rib 8, the bottom of the stirrup 10 is suspended, and the bottom protective layer is ensured to meet the construction requirements; if the thickness of the bottom protective layer can not meet the construction requirements, the adjusting screw rod 4 can be driven to rotate by the adjusting handle 5, the adjusting screw rod 4 and the adjustable sleeve 2 rotate through threads, the up-and-down movement of the adjusting screw rod 4 can be controlled, and therefore the stirrup 10 is driven to move up and down through the hook connecting rod 3, and the thickness of the bottom protective layer is kept at 20-25 mm. The adjusting screw rod 4 can adopt an M32 screw rod.
Referring to fig. 3, a method for adjusting the thickness of a steel bar protection layer includes the following steps:
step 1: the support connecting rod 1 is supported between the template 9 and the adjustable sleeve 2, and the stirrup 10 is hung in the template 9 through the beam upper rib 6 and the hook connecting rod 3.
Step 2: the adjusting nut 12 is rotated through the adjusting handle 5, the stirrup 10 is driven to move up and down through the adjusting screw rod 4 and the hook connecting rod 3, and the height of the stirrup 10 is adjusted, namely the thickness of the bottom protective layer is adjusted. When the adjusting nut 12 is rotated clockwise, the adjusting screw rod 4 is lifted through the threads, so that the stirrup 10 is driven to be adjusted upwards; when the adjusting nut 12 is rotated anticlockwise, the adjusting screw rod 4 descends through threads, so that the stirrup 10 is driven to be adjusted downwards; in the rotation process of the adjusting nut 12, due to the gravity action of the stirrup 10, the adjusting nut 12 is always placed on the adjustable sleeve 2, and the stability of the adjusting nut 12 and the adjustable sleeve 2 is kept through the support connecting rod 1, so that the stirrup 10 can be stably adjusted up and down to achieve the purpose of controlling the thickness of the bottom protective layer, and the thickness of the bottom protective layer can be adjusted according to construction requirements and is generally 20-25 mm.
And step 3: a pair of positioning blocks 7 is arranged at the joint of the stirrup 10 and the cast-in-place plate 11.
And 4, step 4: the stirrups 10 are placed in the formwork 9 through the pair of positioning blocks 7, and a side protective layer and a bottom protective layer with proper thickness are formed between the stirrups 10 and the formwork 9, so that later-stage pouring operation is facilitated.
Step 4.1: the stirrup 10 is hung on the pair of positioning blocks 7 through the beam support rib 8, and a bottom protective layer is formed at the bottom of the stirrup 10, wherein the thickness of the bottom protective layer is preferably 20-25 mm.
Step 4.2: the external corners 71 of the pair of positioning blocks 7 are clamped between the outer walls of the two sides of the stirrup 10 and the inner walls of the two sides of the formwork 9, a side protective layer is formed between the two sides of the stirrup 10 and the formwork 9, the thickness of the side protective layer is determined by the width of the external corner 71, the thickness of the side protective layer is generally 20mm, and construction requirements can be met.
After the stirrups 10 are adjusted in place and are stably supported through the pair of positioning blocks 7, the supporting connecting rod 1, the adjustable sleeve 2, the hook connecting rod 3, the adjusting screw rod 4, the adjusting handle 5, the adjusting nut 12 and the like which are used for adjusting the height of the stirrups 10 can be disassembled, and later-stage pouring is facilitated.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for adjusting the thickness of a steel bar protective layer is characterized by comprising the following steps: the thickness adjusting method of the steel bar protective layer is realized based on a thickness adjusting device of the steel bar protective layer, and the thickness adjusting device comprises a plurality of support connecting rods (1), an adjustable sleeve (2), a hook connecting rod (3), an adjusting screw rod (4), an adjusting handle (5), a pair of positioning blocks (7), a beam support rib (8) and an adjusting nut (12); the bottoms of the pair of positioning blocks (7) are respectively provided with an external corner (71); the beam support rib (8) penetrates through the upper end of the stirrup (10), and the stirrup (10) is hung on the beam support rib (8) through the beam upper rib (6);
one end of each of the plurality of support connecting rods (1) is respectively arranged on the template (9), the other ends of the plurality of support connecting rods (1) are concentrated and arranged on the loose sleeve (2), the loose sleeve (2) is positioned above the template (9), and the adjusting screw rod (4) penetrates through the loose sleeve (2); the adjusting screw rod (4) is sleeved with the adjusting screw rod (4) through threads, the adjusting handle (5) is connected to the adjusting screw rod (12), and the adjusting screw rod (4) can move up and down along the loose sleeve (2) under the driving of the adjusting handle (5) to drive the adjusting screw rod (12) to rotate; one end of a hook connecting rod (3) is connected with an adjusting screw rod (4), the other end of the hook connecting rod (3) is in a hook shape, so that a stirrup (10) can be hooked on the hook connecting rod (3) through a beam upper part rib (6) and can move up and down synchronously with the adjusting screw rod (4), the stirrup (10) is adjusted in place and stably supported through a pair of positioning blocks (7), and then a supporting connecting rod (1), a movable sleeve (2), the hook connecting rod (3), the adjusting screw rod (4), an adjusting handle (5) and an adjusting nut (12) for adjusting the height of the stirrup (10) are removed;
the thickness adjusting method of the steel bar protective layer comprises the following steps:
step 1: the support connecting rod (1) is supported between the template (9) and the movable sleeve (2), and the stirrup (10) is hung in the template (9) through the upper rib (6) of the beam by the hook connecting rod (3);
step 2: the adjusting nut (12) is rotated through the adjusting handle (5), the stirrup (10) is driven to move up and down through the adjusting screw rod (4) through the hook connecting rod (3), and the height of the stirrup (10) is adjusted, namely the thickness of the bottom protective layer is adjusted;
and step 3: a pair of positioning blocks (7) is arranged at the joint of the stirrup (10) and the cast-in-place plate (11);
and 4, step 4: placing the stirrup (10) in the template (9) through a pair of positioning blocks (7), and forming a side protective layer and a bottom protective layer between the stirrup (10) and the template (9); the method comprises the following steps:
step 4.1: the stirrups (10) are hung on the pair of positioning blocks (7) through beam supporting ribs (8), and a bottom protective layer is formed at the bottoms of the stirrups (10);
step 4.2: the external corners (71) of the pair of positioning blocks (7) are clamped between the outer walls of the two sides of the stirrup (10) and the inner walls of the two sides of the template (9), and a side protective layer is formed between the two sides of the stirrup (10) and the template (9).
2. The method for adjusting the thickness of a reinforcing bar-protecting layer as set forth in claim 1, wherein: the width of the external corner (71) is 20 mm.
3. The method for adjusting the thickness of a reinforcing bar-protecting layer as set forth in claim 1, wherein: positioning grooves (72) are respectively formed in the tops of the pair of positioning blocks (7), and the beam support ribs (8) can be positioned and embedded in the pair of positioning blocks (7) through the positioning grooves (72);
the longitudinal section of the positioning groove (72) is of a semicircular structure matched with the beam supporting rib (8);
the positioning block (7) is of a ladder platform structure with a narrow upper part and a wide lower part.
4. The method for adjusting the thickness of a reinforcing bar-protecting layer as set forth in claim 1, wherein: loose sleeve (2) on be equipped with a plurality of connector (21), support connecting rod (1) is connected with loose sleeve (2) through connector (21), support connecting rod (1) rotates around connector (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910133667.1A CN109653445B (en) | 2019-02-22 | 2019-02-22 | Thickness adjusting device and method for steel bar protection layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910133667.1A CN109653445B (en) | 2019-02-22 | 2019-02-22 | Thickness adjusting device and method for steel bar protection layer |
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| Publication Number | Publication Date |
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| CN109653445A CN109653445A (en) | 2019-04-19 |
| CN109653445B true CN109653445B (en) | 2021-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910133667.1A Expired - Fee Related CN109653445B (en) | 2019-02-22 | 2019-02-22 | Thickness adjusting device and method for steel bar protection layer |
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| CN (1) | CN109653445B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111391113B (en) * | 2020-03-24 | 2021-05-07 | 石家庄铁源工程咨询有限公司 | Steel bar protection layer thickness adjusting device and high-speed railway sleeper concrete placement |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1267474A (en) * | 1969-04-11 | 1972-03-22 | Baustahlgewebe Gmbh | Improvements in or relating to concrete beams incorporating stirrup reinforcements |
| CN102587661A (en) * | 2012-03-22 | 2012-07-18 | 广东中城建设集团有限公司 | Method for constructing tall-section structural column of reinforced concrete frame |
| CN103089010A (en) * | 2013-01-15 | 2013-05-08 | 中冶天工上海十三冶建设有限公司 | Cradle construction device replacing reinforced concrete beam bottom protection layer and cradle construction method |
| CN203049922U (en) * | 2012-12-31 | 2013-07-10 | 新乡职业技术学院 | Slab reinforcement positioning device |
| CN103422622A (en) * | 2013-09-07 | 2013-12-04 | 唐山曹妃甸二十二冶工程技术有限公司 | Height-adjustable recyclable reinforcing steel bar split heads |
| CN206070881U (en) * | 2016-09-12 | 2017-04-05 | 中国建筑一局(集团)有限公司 | Utilize beam bottom steel bar structure of reinforcing bar protection layer thickness of steel bar support skeleton control |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090277123A1 (en) * | 2008-05-07 | 2009-11-12 | Marco Guazzo | Connector for the connection between a metal element and an element made of concrete |
-
2019
- 2019-02-22 CN CN201910133667.1A patent/CN109653445B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1267474A (en) * | 1969-04-11 | 1972-03-22 | Baustahlgewebe Gmbh | Improvements in or relating to concrete beams incorporating stirrup reinforcements |
| CN102587661A (en) * | 2012-03-22 | 2012-07-18 | 广东中城建设集团有限公司 | Method for constructing tall-section structural column of reinforced concrete frame |
| CN203049922U (en) * | 2012-12-31 | 2013-07-10 | 新乡职业技术学院 | Slab reinforcement positioning device |
| CN103089010A (en) * | 2013-01-15 | 2013-05-08 | 中冶天工上海十三冶建设有限公司 | Cradle construction device replacing reinforced concrete beam bottom protection layer and cradle construction method |
| CN103422622A (en) * | 2013-09-07 | 2013-12-04 | 唐山曹妃甸二十二冶工程技术有限公司 | Height-adjustable recyclable reinforcing steel bar split heads |
| CN206070881U (en) * | 2016-09-12 | 2017-04-05 | 中国建筑一局(集团)有限公司 | Utilize beam bottom steel bar structure of reinforcing bar protection layer thickness of steel bar support skeleton control |
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| CN109653445A (en) | 2019-04-19 |
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