CN112096156A - Reinforced concrete silo, protection method for silo wall of silo and material storage station - Google Patents
Reinforced concrete silo, protection method for silo wall of silo and material storage station Download PDFInfo
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- CN112096156A CN112096156A CN202010989123.8A CN202010989123A CN112096156A CN 112096156 A CN112096156 A CN 112096156A CN 202010989123 A CN202010989123 A CN 202010989123A CN 112096156 A CN112096156 A CN 112096156A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
- E04H7/22—Containers for fluent solids, e.g. silos, bunkers; Supports therefor
- E04H7/24—Constructions, with or without perforated walls, depending on the use of specified materials
- E04H7/26—Constructions, with or without perforated walls, depending on the use of specified materials mainly of concrete, e.g. reinforced concrete or other stone-like materials
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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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0296—Repairing or restoring facades
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Abstract
The invention relates to the field of concrete building construction, and discloses a reinforced concrete silo, a protection method of silo walls of the silo and a material storage station, wherein the protection method comprises the steps of chiseling loose concrete at a damaged part to a hard part to form a repair concave part; paving a protective net (2) in the repairing concave part; and arranging a template for covering the repairing concave part on the silo wall on which the protective net is laid, filling grouting material (5) into the repairing concave part covered by the template, and solidifying the grouting material (5) to form a repairing layer. The invention solves the problem that the silo wall is damaged and cannot support subsequent use because the silo wall needs to frequently bear falling impact of bulk materials in the using process.
Description
Technical Field
The invention relates to the field of concrete building construction, in particular to a reinforced concrete silo, a protection method for silo walls of the silo and a material storage station.
Background
In recent years, silo structures are developed towards the trend of large-scale, the number of reinforced concrete silos built in China is continuously increased, the diameter and the capacity are also continuously increased, at present, the silos with the largest single bodies exceed megaton, and ten-thousand-ton silos and hundred-thousand-ton silos are frequently used in practical engineering.
The silo wall needs to be frequently subjected to falling impact of bulk materials in the using process, so that the original protective layer on the surface layer of the inner wall of the silo wall falls off after the silo wall is used for a long time, the concrete protective layer is peeled off in a large area, the reinforcing steel bars (radial and circumferential) are exposed in a large area, slightly corroded and locally broken, and a plurality of positions of the inner wall are broken to penetrate through holes, so that the silo wall is damaged and cannot support subsequent use.
Disclosure of Invention
The invention aims to overcome the defect that the silo wall of the silo in the prior art cannot support subsequent use due to the fact that the silo wall needs to frequently bear falling impact of a bulk cargo in the use process. Aiming at the problems, the structure and the method repair the damaged inner wall of the silo wall and protect the inner wall of the silo wall, so that the inner wall of the reinforced concrete silo wall has certain capacity of resisting the falling impact of bulk materials and damage in the subsequent use process.
In order to accomplish the above objects, the present invention provides, in one aspect, a method for protecting a wall of a reinforced concrete silo, the method comprising,
picking and chiseling the loose concrete at the damaged part to the hard part to form a repair concave part;
paving a protective net in the repairing concave part;
arranging a template for covering the repairing concave part on the bin wall on which the protective net is laid, filling grouting material into the repairing concave part covered by the template, and solidifying the grouting material to form a repairing layer;
according to the invention, the repairing concave part is arranged at the damaged part, and the protective net is laid in the repairing concave part and then the grouting material is filled to form the repairing layer, so that the repairing of the damaged reinforced concrete silo wall is realized, and the technical effect of repairing the reinforced concrete silo wall is realized. Therefore, the technical problem that the silo wall is damaged and cannot support subsequent use due to the fact that the silo wall needs to frequently bear falling impact of the bulk cargo in the using process is solved.
Preferably, the protection method comprises at least one of the following modes,
the first method is as follows: supporting the peripheral area of the damaged part of the bin wall by using a supporting plate so as to expose the damaged part outside;
the second method comprises the following steps: removing the template after the grouting material is solidified to form a repair layer;
and/or the presence of a gas in the gas,
after the grouting material is solidified to form a repairing layer, laying a protection plate on the template or after the template is dismantled;
the third method comprises the following steps: the device comprises a split bolt, wherein the split bolt comprises a screw rod penetrating through a repairing layer and a bin wall and a nut arranged at the end part of the screw rod and used for fastening the screw rod, so that the repairing layer is attached to the bin wall;
the method is as follows: scraping loose concrete at the damaged part to the hard part to leak the original broken part of the reinforcing steel bar, so that the original broken part of the reinforcing steel bar is positioned in the repairing concave part, and the original broken part of the reinforcing steel bar is connected through a new reinforcing steel bar;
and/or the presence of a gas in the gas,
the breakage location is located on an inner surface of the bin wall for contact with the material.
Preferably, when the protection method comprises the third mode, the protection method further comprises the step of arranging a protection plate on the outer side of the repair layer, and the split bolts penetrate through the protection plate, the repair layer and the bin wall.
Preferably, the protection method comprises the step of injecting grouting material between the repairing layer and the protection plate so that the repairing layer is tightly attached to the protection plate.
Preferably, when the protection method includes the fourth mode, the original reinforcement breaking part and the new reinforcement are connected by double-sided welding.
Preferably, when the protection method includes the fourth mode, the protective net and the original steel bar breaking part as well as the new steel bar are connected through a radial connecting piece extending in the thickness direction of the bin wall.
A second aspect of the invention provides a reinforced concrete silo;
the reinforced concrete silo comprises a silo wall, wherein a repairing concave part formed by chiseling loose concrete at a damaged part to a hard part is formed in the silo wall, a protective net is paved in the repairing concave part, and a grouting repairing layer for covering the protective net is arranged in the repairing concave part.
Preferably, the reinforced concrete silo comprises at least one of the following ways,
the first method is as follows: the device comprises a split bolt, wherein the split bolt comprises a screw rod penetrating through a repairing layer and a bin wall and a nut arranged at the end part of the screw rod and used for fastening the screw rod, so that the repairing layer is attached to the bin wall;
the second method comprises the following steps: a protection plate covers the repairing layer, and a split bolt penetrates through the protection plate, the repairing layer and the bin wall;
the third method comprises the following steps: the original steel bar breaking part with the bin wall is arranged in the repairing concave part, and the original steel bar breaking part is connected through a new steel bar;
the method is as follows: the breakage location is located on an inner surface of the bin wall for contact with the material.
Preferably, when the reinforced concrete silo comprises the third mode, the protective net, the original steel bar breaking part and the new steel bars are connected through a radial connecting piece extending in the thickness direction of the silo wall.
A third aspect of the invention provides a material storage station;
the material storage station comprises a silo wall, including any one of the reinforced concrete silos.
Drawings
FIG. 1 is a schematic sectional view of a reinforced concrete silo according to an embodiment of the present invention;
FIG. 2 is a schematic view illustrating the installation of a supporting plate for a wall of a reinforced concrete silo according to an embodiment of the present invention;
fig. 3 is a partial structural view of a protective net of a reinforced concrete silo according to an embodiment of the present invention.
Description of the reference numerals
0. A damaged portion; 1. a support plate; 2. a protective net; 201. circumferential reinforcing steel bars; 202. radial reinforcing steel bars; 3. oppositely pulling the bolts; 301. a screw; 302. a nut; 4. a protection plate; 5. grouting material; 6. new reinforcing steel bars; 7. original steel bars; 8. an expansion bolt.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. 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 application.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the above-described drawings, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper" and "inner" indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be mechanically coupled, may be directly coupled, may be indirectly coupled through intervening media, or may be in communication between two devices, elements, or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to the accompanying drawings in conjunction with the embodiments
Detailed description of the preferred embodiment
The invention provides a method for protecting a reinforced concrete silo wall, which solves the problem that the silo wall is damaged and cannot support subsequent use due to the fact that the silo wall needs to frequently bear falling impact of a bulk cargo in the use process. The protection method comprises the following steps:
chiseling the loose concrete at the damaged part 0 to a hard part to form a repair concave part;
paving a protective net 2 in the repairing concave part;
arranging a template for covering the repairing concave part on the silo wall on which the protective net 2 is laid, filling grouting material 5 into the repairing concave part covered by the template, and solidifying the grouting material 5 to form a repairing layer;
in the method, the loose concrete can be removed and cleaned conveniently for subsequent repair and construction, and the condition that the repaired bin wall strength and the subsequent grouting material pouring effect in the repair concave part are influenced due to uneven laying of steel or a protective net caused by broken concrete stones is avoided. The laying of the protective screening 2 is integrated with the pouring of the grouting material 5, so that the impact strength and toughness of the formed repairing layer can be improved. The overall durability of the repaired silo wall structure is improved.
In a preferred embodiment of the invention, as shown in fig. 3, the protection net 2 is a reinforcing mesh consisting of circumferential reinforcing bars 201 and radial reinforcing bars 202, the type and arrangement of the circumferential reinforcing bars 201 can be 12 Φ 200, the type and arrangement of the radial reinforcing bars 202 can be 14 Φ 200, and the concrete protection thickness of the reinforcing mesh in the repair layer is 30 mm.
In a further preferred embodiment of the invention, the method of protection comprises chiseling the delivered concrete of the damaged portion 0 to the hard portion to leak out the original bar break portion so that the original bar break portion is located within the repaired recess, the original bar break portion being connected by the new bar 6. In a further preferred embodiment of the invention, as shown in fig. 1, the broken portion of the original rebar and the new rebar 6 are joined by double-sided welding. In a more common embodiment of the invention, the breakage 0 is located on the inner surface of the bin wall intended to come into contact with the material.
In order to further improve the durability of the structure of the repaired silo wall, in other embodiments of the invention, the protective net 2 and the original reinforcement breaks and the new reinforcements 6 in the repair layer are connected by radial connectors extending in the thickness direction of the silo wall. In the embodiment of the present invention, the radial connecting member may be a steel wire that binds and fixes the positional relationship between the protective net 2 and the original reinforcement bar cut-off portion and the new reinforcement bar 6. Or other structures that can fix their relative positions.
In a preferred embodiment of the present invention, the shielding method comprises the step of arranging the support plate 1, as shown in fig. 2, on the silo wall of the reinforced concrete silo through the expansion bolts 8 with the support plate 1. The supporting plate 1 is adopted to support the peripheral area of the damaged part 0 of the bin wall, so that the damaged part is exposed outside, and the filling of the repairing concave part is facilitated.
In a further preferred embodiment of the invention, in order to increase the durability of the overall structure after the reinforced concrete silo is repaired, a protective plate, preferably a steel plate, is laid after the grouting material 5 has solidified to form a repaired layer. The arrangement of the protection plate is used for further improving the durability of the reinforced concrete silo. In one embodiment of the invention, the protective plate is laid after the formwork is removed after the grouting material 5 has set to form the repair layer. In another embodiment of the invention, after the grouting material 5 is solidified to form the repairing layer, a protective plate is laid on the template, the conventional template is made of a wood material with better toughness and buffer performance, and the protective plate is directly arranged on the template, so that the anti-impact capability, namely the durability, of the wall of the repaired reinforced concrete silo can be improved, and a better repairing effect is achieved.
In the preferred embodiment of the invention, the split bolt 3 is included, and the split bolt 3 includes a screw 301 penetrating through the repairing layer and the bin wall and a nut 302 arranged at the end of the screw 301 for fastening the screw 301, so that the repairing layer and the bin wall are in fit connection.
In order to improve the impact resistance of the mending layer in use, in a preferred embodiment of the invention, a protective plate 4 is arranged on the outer side of the mending layer, and the protective plate 4 is preferably arranged on one side of the inner surface of the bin wall for contacting with materials; the split bolts 3 penetrate through the protection plate 4, the repairing layer and the bin wall, so that the protection plate 4, the repairing layer and the bin wall are tightly connected. The protection plate 4 may be a steel plate or a rubber plate.
In the embodiment of the invention, in order to improve the tightness degree between the protection plate 4 and the repair layer, the grouting material 5 is poured between the protection plate 4 and the repair layer, and the grouting material 5 can be CGM-2 high-strength grouting material.
In the embodiment of the present invention, the grouting material 5 is used for many times, it should be noted that the technical scheme of the present invention adopts the grouting material 5 of different materials according to different uses, for example, the grouting material 5 is filled into the repaired concave part to form the repaired layer, and the grouting material 5 here can be CGM-2 high-strength grouting material containing coarse aggregate. In order to improve the tightness degree between the protection plate 4 and the repair layer, a grouting material 5 is poured between the protection plate 4 and the repair layer, and the grouting material 5 can be CGM-2 high-strength grouting material. Even, in order to enhance the durability of the whole structure of the repairing layer, the gap is compacted around the screw 301 of the tension bolt 3 to carry out grouting, and the grouting at the position can be independently selected according to the requirements of strength and density, and can be CGM-2 high-strength grouting without coarse aggregate.
Detailed description of the invention
In one embodiment of the protection method for the wall of the reinforced concrete silo, the protection method comprises a support plate 1, expansion bolts 8, new steel bars 6, a protective net 2, split bolts 3, a protection plate 4 and grouting materials 5. Preferably, the protection net 2 is a steel bar net, and the support plate 1 and the protection plate 4 are both steel plates. The protection method comprises the following steps:
the surrounding area of the bin wall damage portion 0 is supported by using a support plate 1, i.e. a steel plate, so that the damage portion 0 is exposed to the outside, and is fixed by using M16 expansion bolts 8, preferably, the arrangement interval of the expansion bolts 8 is 200mm, and the expansion bolts 8 are 100mm from the edge.
The vertical and annular reinforcing steel bars missing from the broken part of the original reinforcing steel bar 7 are filled according to the original design, the new reinforcing steel bar 6 and the broken part of the original reinforcing steel bar 7 are welded on two sides, the total length of a welding seam is not less than 5d (d represents the diameter of the reinforcing steel bar), and the corroded reinforcing steel bar is subjected to rust removal treatment before welding.
A layer of protective net 2 is arranged at a damaged part 0 of the wall of the reinforced concrete silo and attached to the wall of the silo, the protective net 2 is preferably a reinforcing mesh, more preferably, the circumferential reinforcing steel bar 201 of the reinforcing mesh is 12 phi 200, the radial reinforcing steel bar 202 of the reinforcing mesh is 14 phi 200, and the thickness of a concrete protective layer formed by pouring grouting material 5 is 30 mm.
After the reinforcing mesh is added, a formwork needs to be supported on the inner wall, and CGM-2 high-strength grouting material (containing coarse aggregate) is poured after the formwork is supported; after the strength of the high-strength grouting material meets the requirement, firstly, installing M14 split bolts 3 in the installation holes on the silo wall of the silo, preferably, the distance between the split bolts 3 is 500mm, and sealing the gap between the screw 301 and the installation holes by using epoxy mortar.
After the split bolts 3 are installed, the protection plates 4 are laid, preferably the protection plates 4 are steel plates, further preferably the steel plates are 1000mm long in top, 20mm thick in thickness and determined by the actual size of the reinforced concrete silo, the steel plates can be divided into a plurality of sections to be laid according to the actual situation on site so as to facilitate the operation of on-site construction, the split bolts 3 of the type M14 are fastened, and the nuts 302, the gaskets and the steel plates are welded after the fastening is completed.
Due to the influence of the curvature of the silo wall of the reinforced concrete silo, the part of the locally added steel plate (namely the protection plate) can not be completely overlapped with the silo wall of the reinforced concrete silo, and CGM-2 high-strength grouting material needs to be injected between the position of the repaired silo wall and the gap of the newly added steel plate, so that the silo wall of the reinforced concrete silo is ensured to be tightly attached to the newly added steel plate.
Detailed description of the preferred embodiment
In order to achieve the above object, according to another aspect of the present application, there is provided a reinforced concrete silo.
The reinforced concrete silo according to the invention comprises:
the bin wall is provided with a repairing concave part formed by chiseling the loose concrete at the damaged part 0 to a hard part, a protective net 2 is paved in the repairing concave part, and a grouting repairing layer for covering the protective net 2 is arranged in the repairing concave part. The breakage 0 is located on the inner surface of the bin wall intended to come into contact with the material.
Preferably, the repair device comprises a split bolt 3, wherein the split bolt 3 comprises a screw rod penetrating through the repair layer and the bin wall and a nut 302 arranged at the end of the screw rod 301 and used for fastening the screw rod 301, so that the repair layer and the bin wall are in fit connection.
In the preferred embodiment of the present invention, the repaired layer is covered with the guard plate 4, and the tie bolts 3 pass through the guard plate 4, the repaired layer and the silo wall. Furthermore, the original steel bar breaking part with the bin wall in the concave part is repaired, and the original steel bar breaking part is connected through a new steel bar 6.
In a further preferred embodiment of the present invention, the protection net 2 and the original rebar breaks and the new rebar 6 are connected by radial connectors extending in the thickness direction of the silo wall. The radial connecting member may be a steel wire for binding and fixing the protective net 2, the original rebar breaking portion, and the new rebar 6, or another connecting member capable of fixing the position.
Detailed description of the invention
To achieve the above object, according to another aspect of the present application, a material storage station is provided.
The material storage station according to the invention comprises any one of the third embodiment of the reinforced concrete silo.
According to the invention, the repairing concave part is arranged at the damaged part, and the protective net is laid in the repairing concave part and then the grouting material is filled to form the repairing layer, so that the repairing of the damaged reinforced concrete silo wall is realized, and the technical effect of repairing the reinforced concrete silo wall is realized. Therefore, the technical problem that the silo wall is damaged and cannot support subsequent use due to the fact that the silo wall needs to frequently bear falling impact of the bulk cargo in the using process is solved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The method for protecting the wall of the reinforced concrete silo is characterized by comprising the following steps
Chiseling the loose concrete of the damaged part (0) to a hard part to form a repairing concave part;
paving a protective net (2) in the repairing concave part;
and arranging a template for covering the repairing concave part on the silo wall on which the protective net is laid, filling grouting material (5) into the repairing concave part covered by the template, and solidifying the grouting material (5) to form a repairing layer.
2. The method of protecting a reinforced concrete silo wall of claim 1, wherein the method of protecting comprises at least one of,
the first method is as follows: supporting the peripheral area of the damaged part (0) of the bin wall by using a supporting plate (1) so as to expose the damaged part (0) to the outside;
the second method comprises the following steps: removing the template after the grouting material (5) is solidified to form a repair layer;
and/or the presence of a gas in the gas,
after the grouting material (5) is solidified to form a repairing layer, laying a protection plate on the template or after the template is dismantled;
the third method comprises the following steps: the device comprises a split bolt (3), wherein the split bolt (3) comprises a screw rod (301) penetrating through a repairing layer and a bin wall and a nut (302) arranged at the end part of the screw rod (301) and used for fastening the screw rod (301), so that the repairing layer is attached to the bin wall;
the method is as follows: scraping loose concrete at the damaged part to the hard part to leak the original broken part of the reinforcing steel bar, so that the original broken part of the reinforcing steel bar is positioned in the repairing concave part, and the original broken part of the reinforcing steel bar is connected through a new reinforcing steel bar (6);
and/or the presence of a gas in the gas,
the breakage location is located on an inner surface of the bin wall for contact with the material.
3. The method for protecting the wall of a reinforced concrete silo according to claim 2, characterized in that when the method comprises the third mode, the method further comprises the step of arranging a protection plate (4) on the outer side of the repair layer, and the counter bolts (3) penetrate through the protection plate (4), the repair layer and the silo wall.
4. The method of protecting a reinforced concrete silo wall according to claim 3, characterized in that it comprises injecting a grouting material (5) between the repaired layer and the protection plate (4) so that the repaired layer closely conforms to the protection plate (4).
5. Method for the protection of the wall of a reinforced concrete silo according to claim 2, characterized in that in the case where the method for protection comprises the fourth mode, the original reinforcement breaks and the new reinforcements (6) are connected by double-sided welding.
6. The method of protecting a reinforced concrete silo wall according to claim 2, characterized in that when the method of protection includes the fourth mode, the protective screen (4) and the original reinforcement breaks and the new reinforcement (6) are connected by radial connectors extending in the thickness direction of the silo wall.
7. A reinforced concrete silo is characterized by comprising a silo wall, wherein a repairing concave portion formed by chiseling loose concrete at a damaged portion to a hard portion is formed in the silo wall, a protective net is laid in the repairing concave portion, and a grouting repairing layer covering the protective net is arranged in the repairing concave portion.
8. The reinforced concrete silo of claim 7, wherein the reinforced concrete silo includes at least one of,
the first method is as follows: the device comprises a split bolt (3), wherein the split bolt (3) comprises a screw rod (301) penetrating through a repairing layer and a bin wall and a nut (302) arranged at the end part of the screw rod (301) and used for fastening the screw rod (301), so that the repairing layer is attached to the bin wall;
the second method comprises the following steps: the protective plate (4) is covered on the repairing layer, and the split bolts (3) penetrate through the protective plate (4), the repairing layer and the bin wall;
the third method comprises the following steps: the original steel bar breaking part with the bin wall is arranged in the repairing concave part, and the original steel bar breaking part is connected through a new steel bar;
the method is as follows: the breakage location is located on an inner surface of the bin wall for contact with the material.
9. The reinforced concrete silo of claim 5, wherein when the reinforced concrete silo comprises the third mode, the protective mesh and the original reinforcement breaks and the new reinforcement are connected by radial connectors extending in the thickness direction of the silo wall.
10. A material storage station, characterized in that it comprises a reinforced concrete silo as claimed in claims 7 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010989123.8A CN112096156A (en) | 2020-09-18 | 2020-09-18 | Reinforced concrete silo, protection method for silo wall of silo and material storage station |
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| CN202010989123.8A CN112096156A (en) | 2020-09-18 | 2020-09-18 | Reinforced concrete silo, protection method for silo wall of silo and material storage station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN208291971U (en) * | 2018-06-14 | 2018-12-28 | 河北钢铁集团矿业有限公司 | A kind of ruggedized construction of mine armored concrete ore storage bin hopper walls |
| CN109457993A (en) * | 2018-11-16 | 2019-03-12 | 中铁二十三局集团第四工程有限公司 | A kind of concrete column restoring and fastening method |
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| CN115110795A (en) * | 2022-06-17 | 2022-09-27 | 攀钢集团西昌钢钒有限公司 | Method and structure for repairing hopper wall of large cement product |
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