CN115199085A - Square column pier structure attached to crawling ladder and construction method of square column pier structure - Google Patents
Square column pier structure attached to crawling ladder and construction method of square column pier structure Download PDFInfo
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- CN115199085A CN115199085A CN202210998217.0A CN202210998217A CN115199085A CN 115199085 A CN115199085 A CN 115199085A CN 202210998217 A CN202210998217 A CN 202210998217A CN 115199085 A CN115199085 A CN 115199085A
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- 238000010276 construction Methods 0.000 title claims abstract description 40
- 230000009193 crawling Effects 0.000 title claims abstract description 18
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 50
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims description 23
- 241000282326 Felis catus Species 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000009434 installation Methods 0.000 description 4
- 230000009194 climbing Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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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
- E04G27/00—Temporary arrangements for giving access from one level to another for men or vehicles, e.g. steps, ramps
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a square column pier structure attached with a ladder stand and a construction method thereof, wherein the square column pier structure attached with the ladder stand comprises a square column pier and the ladder stand, a plurality of attachment structures are arranged between Fang Zhudun and the ladder stand, and the attachment structures are arranged at intervals along the height direction of the square column pier; the attachment structure consists of a telescopic frame component, a square column pier connecting piece and a ladder stand connecting piece. The invention improves the stability of the ladder stand by arranging a plurality of attachment structures between the ladder stand and the square column pier, improves the strength and the stability of the whole structure by utilizing the reinforcing frame and the attachment frame in the attachment structures, and simultaneously adjusts the length of the whole structure by utilizing the telescopic mechanism in the attachment structures so that the distance between the ladder stand and the square column pier is suitable for construction by constructors; the connecting strength between the crawling ladder and the square column pier can be effectively improved, the crawling ladder is prevented from shaking when a constructor climbs the crawling ladder to move up and down and performs construction, the construction safety is effectively improved, and the dismounting efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of construction engineering construction, in particular to a square column pier structure attached with a crawling ladder and a construction method of the square column pier structure attached with the crawling ladder.
Background
With the development of society and the improvement of construction technology level, various traffic constructions are continuously perfected, and high buildings in dangerous places in mountain areas are continuously emerged at present, wherein a square column pier is one of the most common high piers in the design of bridges at present.
In the construction process of the square column pier, constructors need to adopt a ladder stand or a construction elevator to move up and down, but in consideration of investment in the construction process, the ladder stand is adopted when the square column pier is relatively short in the construction process, the construction elevator is adopted when the square column pier is over-high in construction, but the ladder stand is usually unstable and can sway left and right when the ladder stand is adopted to move up and down, and great potential safety hazards exist when the constructors climb the ladder stand up and down; in addition, the installation of the wall-attached part of the ladder is relatively difficult in the construction process, the operation of constructors is difficult, the installation at high altitude is very inconvenient, and the instability of the ladder caused by the climbing up and down of the constructors due to the insufficient rigidity of the wall-attached part exists after the installation is finished.
The existing wall-attached part erecting mode of the ladder stand has the following two schemes: 1) The other end of the steel pipe is connected and fixed with the crawling ladder by embedding the steel plate in advance and welding the steel plate and the steel pipe in advance so as to complete the attachment of the crawling ladder; 2) When the area of the cross section of the square column pier is not large, the steel pipe is used for surrounding the square column pier, and then the steel pipe and the nearest contact surface of the ladder stand are connected and fixed to form a whole, so that the attachment of the ladder stand is completed. But above-mentioned current scheme all has the problem that to adhere to that structural overall stability is relatively poor, the security is not high to the dismouting construction is all comparatively troublesome.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a square column mound structure of adhering to cat ladder, it has good construction safety nature.
In order to solve the technical problems, the invention adopts the technical scheme that: the square column pier structure comprises a square column pier and a ladder stand, wherein a plurality of attachment structures are arranged between Fang Zhudun and the ladder stand and are arranged at intervals in the height direction of the square column pier; the attachment structure consists of a telescopic frame assembly, a square column pier connecting piece and a ladder stand connecting piece;
the telescopic frame assembly is fixed between the square column pier connecting piece and the ladder stand connecting piece; the telescopic frame assembly is formed by sequentially and fixedly connecting a telescopic mechanism, a reinforcing frame and an attachment frame, the square column pier connecting piece is fixed on the attachment frame, and the ladder stand connecting piece is fixed on the telescopic mechanism.
Further, the method comprises the following steps: the telescopic mechanism comprises a first connecting rod, a second connecting rod and a connecting sleeve; the first connecting rod is fixedly connected with the reinforcing frame, the second connecting rod is fixedly connected with the ladder stand connecting piece, and the connecting sleeve is sleeved between the first connecting rod and the second connecting rod and is detachably connected with the first connecting rod and the second connecting rod through a plurality of locking screws respectively.
Further, the method comprises the following steps: the reinforced frame is a frame structure formed by fixedly connecting a plurality of connecting rods, and at least one reinforced inclined strut is further fixed in the reinforced frame.
Further, the method comprises the following steps: two reinforcing inclined struts are fixed in the reinforcing frame, and the two reinforcing inclined struts and the reinforcing frame are fixedly connected to form a triangular reinforcing structure.
Further, the method comprises the following steps: and a reinforcing rib plate is also arranged at the joint of the telescopic mechanism and the reinforcing frame.
Further, the method comprises the following steps: the ladder stand connecting piece is of a groove-shaped structure with an inverted U-shaped cross section, and one end of the ladder stand connecting piece, which is not provided with the notch, is fixedly connected with the telescopic mechanism.
Further, the method comprises the following steps: the number of the ladder stand connecting pieces is two, and the two ladder stand connecting pieces are fixed at the end, not connected with the attachment frame, of the reinforcing frame at intervals.
Further, the method comprises the following steps: the square column pier connecting piece is composed of a fixing plate and a plurality of fixing bolts, the fixing plate is fixed on the attachment frame, the fixing bolts penetrate through the fixing plate, and the thread sections of the fixing bolts extend out in the direction deviating from the attachment frame.
Further, the method comprises the following steps: the number of the square column pier connecting pieces is two, and the two square column pier connecting pieces are fixed at the end, which is not connected with the reinforcing frame, of the attachment frame at intervals.
The invention also discloses a construction method of the square column pier structure attached to the ladder stand, which comprises the following steps:
firstly, processing and assembling an attachment structure in a processing field, and after processing, checking and accepting the attachment structure and conveying the attachment structure to a square column pier construction field;
step two, according to the size of the processed attachment structure, the ladder stand is installed on site, and a concrete cushion layer is poured at the bottom of the ladder stand;
step three, pre-burying bolt hole sites in advance according to the attachment distance of the attachment structure in the construction process of the square column pier;
step four, after the square column pier is poured and the template is removed, connecting the square column pier connecting piece of the attachment structure with the corresponding bolt hole position thread on the square column pier;
step five, after the square column pier connecting piece is fixed, mounting and connecting the crawling ladder and the attachment structure, and adjusting the telescopic mechanism to reach a preset interval in the mounting process;
step six, carrying out integral linearity and structure inspection after the attachment structure is installed, and ensuring that the integral linearity is smooth and straight and no redundant stress exists;
and seventhly, dismantling the ladder stand and the attachment structure after construction is completed.
The invention has the beneficial effects that: the invention improves the stability of the ladder stand by arranging a plurality of attachment structures between the ladder stand and the square column pier, improves the strength and the stability of the whole structure by utilizing the reinforcing frame and the attachment frame in the attachment structures, and simultaneously adjusts the length of the whole structure by utilizing the telescopic mechanism in the attachment structures so that the distance between the ladder stand and the square column pier is suitable for construction by constructors; the connecting structure can effectively improve the connecting strength between the crawling ladder and the square column pier, avoids the crawling ladder from shaking when a constructor climbs the crawling ladder to move up and down and performs construction, effectively improves the construction safety, is convenient to connect, has low construction disassembly and assembly difficulty, and greatly improves the disassembly and assembly efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the attachment structure of the present invention;
FIG. 3 is a schematic structural view of a telescopic mechanism employed in the attachment structure of the present invention;
figure 4 is a cross-sectional view of a ladder connector.
Labeled as: 100-square column pier connecting pieces, 110-fixing plates, 120-fixing bolts, 200-ladder climbing connecting pieces, 300-attachment frames, 310-reinforcing bolts, 400-reinforcing frames, 410-reinforcing inclined struts, 420-reinforcing ribbed plates, 500-telescopic mechanisms, 510-first connecting rods, 520-second connecting rods, 530-connecting sleeves, 540-locking screws, 600-square column piers and 700-ladder climbing.
Detailed Description
In order to facilitate understanding of the invention, the invention is further described below with reference to the accompanying drawings.
In the description of the present invention, it should be noted that the terms "front", "back", "left", "right", "upper", "lower", "inner", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, the structure of the square column pier for attaching the ladder stand disclosed in the present invention includes a square column pier 600, a ladder stand 700, and a plurality of attachment structures disposed between the square column pier 600 and the ladder stand 700, the attachment structures being disposed at intervals in the height direction of the square column pier 600. Attachment structure is by the telescoping frame subassembly, square column mound connecting piece 100 and cat ladder connecting piece 200 constitute, wherein, square column mound connecting piece 100 is used for carrying out the attachment structure and is connected fixedly between the square column mound 600, cat ladder connecting piece 200 is used for being connected fixedly between cat ladder attachment structure and the cat ladder 700, the telescoping frame subassembly is used for adjusting the whole length size of attachment structure, after adopting attachment structure to attach cat ladder 700 on square column mound 600, accessible telescoping frame subassembly is adjusted the interval between cat ladder 700 and the square column mound 600, thereby the messenger can reach the distance that the constructor of being convenient for carried out construction operation to the interval between cat ladder 700 and the square column mound 600.
As shown in fig. 2, the telescopic frame assembly used in the present invention is composed of a telescopic mechanism, an attachment frame 300 and a reinforcing frame 400, and is assembled by sequentially connecting and fixing the telescopic mechanism, the reinforcing frame 400 and the attachment frame 300 in this order, the square pier connecting member 100 is fixed to the attachment frame 300, and the ladder connecting member 200 is fixed to the telescopic mechanism such that the telescopic mechanism is located between the ladder connecting member 200 and the reinforcing frame 400, and the attachment frame 300 is located between the reinforcing frame 400 and the square pier connecting member 100. The invention improves the overall strength and stability of the attachment structure by arranging the reinforcing frame and the attachment frame.
The telescopic mechanism adopted in the telescopic frame assembly is used for adjusting the whole length size of the telescopic frame assembly, and then the effect of adjusting the whole length size of the attachment structure is achieved. As shown in fig. 3, the specific structure of the telescopic mechanism used in the present invention includes a first connecting rod 510, a second connecting rod 520 and a connecting sleeve 530, wherein one end of the first connecting rod 510 is fixedly connected to the ladder connecting member 200, one end of the second connecting rod 520 is fixedly connected to the reinforcing frame 400, and the other ends of the first connecting rod 510 and the second connecting rod 520 are spaced apart from each other and are detachably connected to the connecting sleeve 530. The inner diameter of the connection sleeve 530 is slightly larger than the diameters of the first connection rod 510 and the second connection rod 520 to realize clearance fit, the ends of the first connection rod 510 and the second connection rod 520 are respectively inserted into the connection sleeve 530 from both ends, and the overall length of the telescopic mechanism can be adjusted by relatively moving the first connection rod 510 and the second connection rod 520. The detachable connection between the first connecting rod 510 and the second connecting rod 520 and the connecting sleeve 530 is realized by means of a locking screw 530, a plurality of screw holes are arranged on the connecting sleeve 530, the first connecting rod 510 and the second connecting rod 520, and telescopic adjustment and fixation after adjustment can be realized by relatively moving the first connecting rod 510 and the second connecting rod 520, and then using the locking screw 530 to penetrate through the connecting sleeve 530 and be in threaded connection with the first connecting rod 510 and the second connecting rod 520.
As shown in fig. 2, the attachment frame 300 and the reinforcement frame 400 used in the present invention are both frame structures formed by fixedly connecting a plurality of connecting rods, and the specific shape of the frame structure is not limited, and the connecting rods used are preferably steel connecting rods with high strength; and reinforcing bolts 310 are provided at the joints of the respective connecting rods to improve the strength of the respective joints. In addition, a reinforcing diagonal brace 410 is further arranged in the reinforcing frame 400, and the reinforcing diagonal brace 410 is arranged to support the reinforcing frame 400 so as to improve the overall strength of the reinforcing frame 400; the number of the reinforcing diagonal braces 410 can be selected according to the construction requirement, and in the invention, for example, two reinforcing diagonal braces 410 are adopted, and the two reinforcing diagonal braces 410 are obliquely arranged at a certain included angle and fixedly connected with the connecting rods on the reinforcing frame 400 to form a triangular reinforcing structure with good stability.
Furthermore, in the present invention, a reinforcing rib plate 420 is further disposed at a connection position between the telescopic mechanism and the reinforcing frame 400, and the reinforcing rib plate 420 can be made of a steel plate with low cost, convenient material acquisition and high strength.
In order to facilitate the connection between the ladder stand connecting piece 200 and the ladder stand, as shown in fig. 4, the cross section of the ladder stand connecting piece 200 adopted in the present invention is a groove-shaped structure, one end of the ladder stand connecting piece 200, which is not provided with a notch, is fixedly connected with the telescopic mechanism, and the size of the groove-shaped structure is matched with the size of the connection part of the ladder stand, so that the connection between the ladder stand and the ladder stand connecting piece 200 can be rapidly performed in a card insertion manner. The number of the ladder stand connecting members 200 may be set to two, and the two ladder stand connecting members 200 are fixed at an interval at one end of the reinforcing frame 400, which is not connected to the attachment frame 300, to improve the uniformity of force, so that the stability of connection can be improved.
In order to facilitate the connection between the square pier connector 100 and the square pier, as shown in fig. 2, the square pier connector 100 used in the present invention is composed of a fixing plate 110 and a plurality of fixing bolts 120, the fixing plate 110 is made of a steel plate and fixed on the attachment frame 300 by welding, the fixing bolts 120 pass through the fixing plate 110, and the thread sections of the fixing bolts 120 extend out in a direction away from the attachment frame 300; when carrying out being connected fixedly of square column mound connecting piece 100 and square column mound, only need bore in advance on the square column mound and fix bolt 120 assorted screw hole in advance, can carry out the mode through threaded connection when the assembly fast and be connected fixedly of square column mound connecting piece 100 and square column mound to it is also very convenient to demolish square column mound connecting piece 100 from the square column mound. The number of the square pillar pier connecting members 100 may be set to two, and the two square pillar pier connecting members 100 are fixed at the end of the attachment frame 300 not connected to the reinforcing frame 400 at intervals to improve the uniformity of stress, so that the stability of connection can be improved.
The invention also discloses a construction method of the square column pier structure attached to the ladder stand, which comprises the following steps:
firstly, processing and assembling an attachment structure in a processing field, and after processing, checking and accepting the attachment structure and conveying the attachment structure to a square column pier construction field;
secondly, mounting the ladder stand on site according to the size of the machined attachment structure, pouring a concrete cushion at the bottom of the ladder stand, confirming the mounting position of the ladder stand according to the size of the attachment structure, and ensuring the accuracy of the mounting position of the whole structure;
embedding bolt hole sites in advance according to the attachment distance of the attachment structure in the construction process of the square column pier, and checking and accepting the bolt hole sites in the construction process to ensure the accuracy of the bolt hole sites;
step four, after the square column pier is poured and the template is removed, connecting the square column pier connecting piece of the attachment structure with the corresponding bolt hole site on the square column pier in threaded connection, and ensuring the straightness of the attachment structure during installation;
step five, after the square column pier connecting piece is fixed, mounting and connecting the crawling ladder and the attachment structure, and adjusting the telescopic mechanism to reach a preset distance and fastening the telescopic mechanism when the difference exists between the crawling ladder and the square column pier in the mounting process;
step six, carrying out integral linearity and structure inspection after the attachment structure is installed, and ensuring that the integral linearity is smooth and straight and no redundant stress exists;
seventhly, after the construction is finished, the crawling ladder and the attachment structure are detached; and the dismantling process is carried out from the top downwards, the dismantling process is carried out in layers, the corresponding crawling ladder is dismantled after one attachment structure is dismantled, and the dismantling is carried out from top to bottom in sequence according to the sequence until the whole construction process is completed.
Claims (10)
1. The utility model provides an attached square column mound structure of cat ladder, includes Fang Zhudun (600) and cat ladder (700), its characterized in that: a plurality of attachment structures are arranged between the square column pier (600) and the ladder stand (700), and the attachment structures are arranged at intervals along the height direction of the square column pier (600); the attachment structure consists of a telescopic frame component, a square column pier connecting piece (100) and a ladder stand connecting piece (200);
the telescopic frame assembly is fixed between the square column pier connecting piece (100) and the ladder stand connecting piece (200); the telescopic frame assembly is formed by sequentially and fixedly connecting a telescopic mechanism (500), a reinforcing frame (400) and an attachment frame (300), the square column pier connecting piece (100) is fixed on the attachment frame (300), and the ladder stand connecting piece (200) is fixed on the telescopic mechanism (500).
2. The square pillar pier structure of claim 1, wherein: the telescopic mechanism (500) comprises a first connecting rod (510), a second connecting rod (520) and a connecting sleeve (530); the ladder comprises a first connecting rod (510) and a reinforcing frame (400), wherein the second connecting rod (520) is fixedly connected with a ladder stand connecting piece (200), and a connecting sleeve (530) is sleeved between the first connecting rod (510) and the second connecting rod (520) and detachably connected with the first connecting rod (510) and the second connecting rod (520) through a plurality of locking screws (540).
3. The square pillar pier structure of claim 1, wherein: the attachment frame (300) and the reinforcing frame (400) are both frame structures formed by fixedly connecting a plurality of connecting rods, and reinforcing bolts (310) are arranged at the connecting positions of the connecting rods; at least one reinforcing inclined strut (410) is further fixed in the reinforcing frame (400).
4. The square pillar pier structure for attaching a ladder stand according to claim 3, wherein: two reinforcing inclined struts (410) are fixed in the reinforcing frame (400), and the two reinforcing inclined struts (410) are fixedly connected with the reinforcing frame (400) to form a triangular reinforcing structure.
5. The square pillar pier structure of claim 1, wherein: and a reinforcing rib plate (420) is also arranged at the joint of the telescopic mechanism (500) and the reinforcing frame (400).
6. The square column pier structure of claim 1, which is attached to a ladder, wherein: the ladder stand connecting piece (200) is of a groove-shaped structure with an inverted U-shaped cross section, and one end of the ladder stand connecting piece (200) without the notch is fixedly connected with the telescopic mechanism (500).
7. The structure of a square column pier attached to a ladder stand of claim 6, wherein: the number of the ladder stand connecting pieces (200) is two, and the two ladder stand connecting pieces (200) are fixed at one end of the reinforcing frame (400) which is not connected with the attaching frame (300) at intervals.
8. The square pillar pier structure of claim 1, wherein: the square column pier connecting piece (100) is composed of a fixing plate (110) and a plurality of fixing bolts (120), the fixing plate (110) is fixed on the attachment frame (300), the fixing bolts (120) penetrate through the fixing plate (110), and the thread sections of the fixing bolts (120) extend out towards the direction deviating from the attachment frame (300).
9. The square pillar pier structure for attaching a ladder stand according to claim 8, wherein: the number of the square column pier connecting pieces (100) is two, and the two square column pier connecting pieces (100) are fixed at the end, which is not connected with the reinforcing frame (400), of the attachment frame (300) at intervals.
10. The construction method of the square column pier structure with the attached ladder stand according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:
firstly, processing and assembling an attachment structure in a processing field, and after processing, checking and accepting the attachment structure and conveying the attachment structure to a square column pier construction field;
step two, according to the size of the machined attachment structure, the ladder stand is installed on site, and a concrete cushion is poured at the bottom of the ladder stand;
step three, pre-burying bolt hole positions in advance according to the attachment distance of the attachment structure in the construction process of the square column pier;
step four, after the square column pier is poured and the template is removed, connecting the square column pier connecting piece of the attachment structure with the corresponding bolt hole position thread on the square column pier;
step five, after the square column pier connecting piece is fixed, mounting and connecting the crawling ladder and the attachment structure, and adjusting the telescopic mechanism to reach a preset interval in the mounting process;
step six, after the attachment structure is installed, overall linearity and structure inspection is carried out, so that the overall linearity is ensured to be smooth and straight, and no redundant stress exists;
and seventhly, dismantling the ladder stand and the attachment structure after construction is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210998217.0A CN115199085A (en) | 2022-08-19 | 2022-08-19 | Square column pier structure attached to crawling ladder and construction method of square column pier structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210998217.0A CN115199085A (en) | 2022-08-19 | 2022-08-19 | Square column pier structure attached to crawling ladder and construction method of square column pier structure |
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| CN115199085A true CN115199085A (en) | 2022-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210998217.0A Pending CN115199085A (en) | 2022-08-19 | 2022-08-19 | Square column pier structure attached to crawling ladder and construction method of square column pier structure |
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| CN (1) | CN115199085A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115977524A (en) * | 2023-02-16 | 2023-04-18 | 中国十九冶集团有限公司 | Ladder stand system for high pier column construction |
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| 刘宝新;王军;: "高架框架墩连续梁悬吊支架法施工技术", 桥梁建设, no. 1 * |
| 吴建松;: "圆端形薄壁空心高墩轻型爬架配合翻模施工技术研究", 施工技术, no. 11 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115977524A (en) * | 2023-02-16 | 2023-04-18 | 中国十九冶集团有限公司 | Ladder stand system for high pier column construction |
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Application publication date: 20221018 |