CN110700679A - Secondary pouring method for tower foot of communication iron tower - Google Patents
Secondary pouring method for tower foot of communication iron tower Download PDFInfo
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- CN110700679A CN110700679A CN201910797403.6A CN201910797403A CN110700679A CN 110700679 A CN110700679 A CN 110700679A CN 201910797403 A CN201910797403 A CN 201910797403A CN 110700679 A CN110700679 A CN 110700679A
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- tower
- grouting material
- pouring
- fine stone
- foot
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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
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/22—Sockets or holders for poles or posts
- E04H12/2253—Mounting poles or posts to the holder
- E04H12/2261—Mounting poles or posts to the holder on a flat base
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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
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/34—Arrangements for erecting or lowering towers, masts, poles, chimney stacks, or the like
- E04H12/341—Arrangements for casting in situ concrete towers or the like
Abstract
The invention provides a secondary pouring method for a tower foot of a communication iron tower, which comprises the following steps: firstly, chiseling the surface of a tower footing base, and respectively putting square PVC pipes with high inside and low outside in 4 directions which are vertical to each other after cleaning; secondly, extruding a foam foaming agent to fill a gap between the inner side of the tower body and the tower foundation, and slowly accumulating from the bottom to the top of the base to form an annular plastic inner mold; vertically fixing a flexible metal plate at a position of at least 30cm outside the tower footing flange plate to form an annular outer template; pouring fine stone grouting material with excellent flowing property between the plastic inner membrane and the outer template along the edge of the outer template, troweling the surface after pouring is finished, and spraying a water evaporation inhibitor; and fifthly, detaching the external template after the strength of the fine stone grouting material reaches 5MPa, and spraying a concrete curing agent. The fine stone grouting material with more convenient formwork support and better fluidity and crack resistance in the construction process effectively solves the problem that the traditional secondary pouring concrete is easy to crack.
Description
Technical Field
The invention relates to the technical field of a pouring process of a tower foot of a communication iron tower, in particular to a secondary pouring method of the tower foot of the communication iron tower.
Background
In the construction process of the foundation engineering of the communication iron tower, after the main structure of the iron tower is installed, the concrete secondary pouring construction must be carried out on the tower foot, the main functions of the construction are to prevent the lower nut from loosening and the screw rod from rusting, and simultaneously, the iron tower foundation and the tower body are integrated in tight connection, the force transmission is clear and closer to the theoretical design, and the drawing force born by the upper locking nut is reduced.
The prior patent documents mainly focus on reinforcement after the tower foot bolt is corroded and research on the corrosion principle of the tower foot bolt. CN 106378579A: a method for reinforcing and reinforcing the corrosion damage of a tower foot of a power transmission angle steel tower effectively improves the intersolubility and solubility of molten parent metal in a welding seam by adopting a proper welding material and matching with a corresponding welding process and parameters, and effectively prevents intermetallic compounds and solid solution residual components from being separated out, thereby effectively ensuring the welding quality and preventing the welding part from generating cracks; however, the reinforcement after the corrosion is a remedy measure, the stability of the tower foot is destroyed from the inside, and even if the reinforcement operation is standard, the stability of the iron tower still has hidden troubles; CN 106759440A: the invention relates to a method for reinforcing foundation bolts of an iron tower, which is used for reinforcing and reinforcing tower legs aiming at the problem that the bearing capacity of the foundation bolts of the tower legs is insufficient after the foundation bolts are built for service, and a method for increasing reinforcing ribs is adopted, so that the rusted foundation bolts are reinforced by bar planting, but the perpendicularity of the tower cannot be adjusted in the later period; the repairing and reinforcing method for the foundation bolts of the iron tower and the tower feet with serious corrosion provides a conventional construction process, a specific implementation method is not explained, and the construction problem under the actual environment provided by the invention is not solved by adopting conventional concrete for construction; dongying iron tower company is skillfully solving the tower foot corrosion difficult problem with the technology of encapsulating, and this technology is the same to traditional iron tower foot encapsulate most adopt plain cement to encapsulate the back several years time will appear rag bolt by serious corrosion, phenomenon such as galvanizing coat is destroyed completely, has proposed the method of antirust glue spraying, but the antirust glue easily melts under high temperature, easy fracture under the low temperature environment again, drop easily, the result of use is not good.
Disclosure of Invention
In order to solve the problems of construction speed and quality of the secondary pouring engineering of the foundation tower leg of the signal tower, the invention provides the construction process of the secondary pouring engineering of the foundation tower leg of the signal tower, and the fine stone grouting material with more convenient formwork support and better fluidity and crack resistance in the construction process effectively solves the problem that the traditional secondary pouring concrete is easy to crack.
The invention relates to a construction method of a signal tower foundation tower foot secondary pouring project, which mainly comprises the following steps:
(1) treating the surface of the tower footing base: uniformly distributed pockmarks with the depth of about 3mm and the number of points of 600 to 800 points per square are chiseled on the concrete bonding surface on the surface of the tower footing base by adopting an electric pick so as to ensure the bonding effect of the new and old structures. After the roughening treatment is finished, removing loose aggregate, gravel, floating slag and dust on the surface of the concrete by using tools such as a high-pressure water fan and the like, and washing the concrete by using clean water. Square PVC pipes with high inside and low outside and 1% gradient are respectively put in 4 directions perpendicular to each other, and the length of the square PVC pipes is the distance between the inner wall of the tower body and the outer mold.
(2) And (3) foaming and erecting a mold at the inner side of the tower base: slowly extruding a foam foaming agent to fill a gap between the inner side of the tower body and the tower foundation, slowly accumulating from bottom to top from the bottom of the base, forming an annular plastic inner mold with the thickness of about 2cm after being quickly hardened, preventing a secondary casting material from flowing into a cavity inside the tower foot, cutting a 2-3mm notch on the phi 100 PVC pipe to sleeve the bolt in order to ensure that the phi 100 PVC pipe is tightly attached to the outer side of the bolt, ensuring that the gap between the foam foaming agent and the inner side of the bolt reaches the thickness of a protective layer, fixing the phi 100 PVC pipe by using a steel wire, and dismantling the phi 100 PVC pipe after the foam foaming agent is foamed.
(3) Fixing a flexible template on the outer side of the tower base: reusable galvanized iron sheets with the height of about 30cm and the length of about 2-3 flange plate diameters are used as outer templates, and the diameters of the outer templates are adjusted to ensure that annular gaps with the diameter of more than 30mm are formed between the outer templates and the outer edge of the bottom flange of the iron tower. The outer side of the template is fixed by steel wires, so that the template is prevented from shifting, lodging and cracking under the action of self stress and lateral pressure of the fine stone grouting material, and a PVC pipe is used as an inner support between the inner side and the upper flange plate.
(4) Pouring fine stone grouting material: pouring the bagged fine stone grouting material into a stirring container, stirring for 3min by using a handheld stirrer to obtain the fine stone grouting material with excellent flowing property, and pouring the fine stone grouting material along the edge of the outer side template. And after the pouring is finished, the surface is smoothed by a spatula, and a moisture evaporation inhibitor is sprayed.
(5) Removing the mold and maintaining: and (5) removing the mold after the strength of the fine stone grouting material reaches 5MPa, and spraying a concrete curing agent.
The invention has the beneficial effects that: (1) the process is simple and effective, the foam foaming agent is adopted to fill the gap between the inner side of the tower body and the tower footing, secondary pouring materials are prevented from flowing into the inner cavity of the tower footing, the problem that the externally climbing pipe tower cannot enter the tower body for construction is solved, a traditional template is not required to be adopted for supporting the tower body in the inner part, and the construction efficiency and the quality are improved. (2) The method creatively provides the method for realizing self-filling by using the fine stone grouting material with better fluidity and crack resistance, spraying the water evaporation inhibitor and the efficient curing agent on the surface to realize the whole-process moisturizing and curing, effectively solves the problem that the traditional concrete is easy to crack, ensures that the protective layer of the bolt reaches the design standard, reduces the oxidation speed of the bolt of the iron tower base, and prolongs the service life of the iron tower base.
Drawings
Fig. 1 is a schematic structural diagram of a tower foot of a communication tower according to the present invention;
in the figure, 1-tower footing base surface, 2-tower footing inside, 3-outside flexible template.
Detailed Description
The following description is merely exemplary of some, but not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art without any inventive step are within the scope of the present invention.
The invention provides a secondary pouring method for tower feet of a communication tower, which comprises the following steps:
firstly, chiseling the surface of a tower footing base, and respectively putting square PVC pipes with high inside and low outside in 4 directions which are vertical to each other after cleaning;
slowly extruding a foam foaming agent to fill a gap between the inner side of the tower body and the tower foundation, and slowly accumulating from bottom to top from the bottom of the base to form an annular plastic inner mold;
vertically fixing a flexible metal plate at a position of at least more than 30cm outside the tower footing to form an annular outer template;
and step four, pouring the fine stone grouting material into a stirring container, and stirring for at least 3min by using a handheld stirrer to obtain the fine stone grouting material with excellent flowing property.
Pouring fine stone grouting material with excellent flowing property between the plastic inner membrane and the outer template along the edge of the outer template, troweling the surface after pouring is finished, and spraying a water evaporation inhibitor;
and fifthly, detaching the external template after the strength of the fine stone grouting material reaches 5MPa, and spraying a concrete curing agent.
Further, in the first step, the roughening treatment includes: uniformly distributed pockmarks with the depth of about 3mm and the number of points of 600 to 800 points per square are chiseled on the concrete bonding surface on the surface of the tower footing base by adopting an electric pick so as to ensure the bonding effect of the new and old structures.
Further, in the step one, the process of putting the PVC pipe into the PVC pipe comprises the following steps: square PVC pipes with high inside and low outside and 1% gradient are placed in 4 directions perpendicular to each other, and the length of the square PVC pipes is the distance between the inner wall of the tower body and the outer mold.
And step two, before foaming, firstly cutting a notch on the PVC pipe, sleeving the bolt at the bottom of the tower, fixing the PVC pipe with the diameter of 100 by using a steel wire, enabling the PVC pipe with the diameter of 100 to be tightly attached to the outer side of the bolt, and after foaming of the foaming agent is finished, dismantling the PVC pipe with the diameter of 100.
In the third step, the flexible metal plate is a recyclable galvanized iron plate with the height of 25 cm-35 cm and the length of 2-3 flange diameters. The outer side of the outer template is fixed by steel wires, so that the template is prevented from shifting, lodging and cracking under the action of self stress and lateral pressure of the fine stone grouting material, and a PVC pipe is used as an inner support between the inner side and the upper flange plate.
In the routine inspection maintenance process of the stock iron tower, the phenomenon that a plurality of tower foot bolts of different degrees are corroded in the ground towers is found, and the safe operation of the iron tower is seriously influenced. The main reasons are as follows: 1) the reserved space is narrow and small, the flowability of the concrete poured by the traditional tower foot for the second time is poor, and the problems of difficult pouring, difficult vibration and incompact pouring exist. When the climbing pipe tower cannot enter the tower body for construction, the bolts are easily wrapped incompletely, and the expected secondary pouring effect cannot be achieved. 2) The traditional tower foot secondary casting material generally uses concrete, the anti-cracking performance of the concrete is poor, and after the concrete is seriously cracked, the protection function of the foundation bolt is weakened or even lost.
Therefore, the secondary casting material in the narrow space of the iron tower foundation and the construction process thereof are developed, the rapid combined construction mold is adopted, and the anti-cracking material with better flowing property is developed, so that the quality and the speed of repair construction can be directly improved, and the construction quality and the construction efficiency are improved.
Example 1
(1) Treating the surface of the tower footing base: in the position 1 in the attached figure 1, uniformly distributed pockmarks with the depth of about 3mm and the number of 600 dots/square are chiseled on the concrete bonding surface on the surface of the foundation base by adopting an electric pick. After the roughening treatment is finished, removing loose aggregate, gravel, floating slag and dust on the surface of the concrete by using tools such as a high-pressure water fan and the like, and washing the concrete by using clean water. Square PVC pipes with high inside and low outside and 1% gradient are respectively put in 4 directions perpendicular to each other, and the length of the square PVC pipes is the distance between the inner wall of the tower body and the outer mold.
(2) And (3) foaming and erecting a mold at the inner side of the tower base: at the position 2 in the attached drawing 1, slowly extruding the foam foaming agent to fill the gap between the inner side of the tower body and the tower foundation, slowly accumulating from bottom to top from the bottom of the base, forming an annular plastic inner mold with the thickness of about 2cm after fast hardening, and avoiding the secondary casting material from flowing into the cavity inside the tower foot.
(3) Fixing a flexible template on the outer side of the tower base: the outer template is made of recyclable galvanized iron sheets with the height of about 30cm and the length of about 2 flange diameters, as shown in 3 in the attached drawing 1. The diameter of the outer die plate is adjusted to ensure that an annular gap of more than 30mm is formed between the outer die plate and the outer edge of the iron tower bottom flange. The outer side of the template is fixed by steel wires, and a PVC pipe is used as an inner support between the inner side and the upper flange plate. And (5) performing anti-leakage treatment on joints of the templates by using waterproof adhesive tapes.
(4) Pouring fine stone grouting material: and (3) introducing the bagged fine stone grouting material into a stirring container, stirring for 3min by using a handheld stirrer to obtain the fine stone grouting material with excellent flowing property, and pouring the fine stone grouting material along the edge of the outer side template. And after the pouring is finished, the surface is smoothed by a spatula, and a moisture evaporation inhibitor is sprayed.
(5) Removing the mold and maintaining: and (5) removing the mold after the strength of the fine stone grouting material reaches 5MPa, and spraying a concrete curing agent.
The pouring method of the invention has the following process advantages:
(1) the process is simple and effective, and the foam foaming agent is adopted in the tower to replace the traditional template, so that the construction efficiency and quality are improved;
(2) the self-filling is realized by using the fine stone grouting material with better fluidity and crack resistance, the problems that the gap between the iron tower and the foundation cannot be filled by the traditional concrete and the like are effectively solved, the stress performance of the tower foundation is improved, and the overall safety of the iron tower is improved;
(3) adopt and reserve measures such as square guide hole, the ascending PVC pipe in four directions promptly, the clearance of the inside debris of water guide and later stage of being convenient for promotes the follow-up convenience of maintaining.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art should make various changes or modifications without departing from the spirit and scope of the present invention.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the foregoing description only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, specification and equivalents thereof.
Claims (7)
1. The secondary pouring method for the tower foot of the communication tower is characterized by comprising the following steps:
firstly, chiseling the surface of a tower footing base, and respectively putting PVC pipes with high inside and low outside in 4 directions which are vertical to each other after cleaning;
slowly extruding a foam foaming agent to fill a gap between the inner side of the tower body and the tower foundation, and slowly accumulating from bottom to top from the bottom of the base to form an annular plastic inner mold;
vertically fixing a flexible metal plate at a position of at least 30cm outside the tower footing flange plate to form an annular outer template;
pouring the fine stone grouting material between the plastic inner membrane and the outer template along the edge of the outer template, pouring, troweling the surface after pouring, and spraying a water evaporation inhibitor;
and fifthly, detaching the external template after the strength of the fine stone grouting material reaches 5MPa, and spraying a concrete curing agent.
2. The method for casting the tower foot of the communication tower twice as claimed in claim 1, wherein in the first step, the roughening treatment is:
uniformly distributed pockmarks with the depth of about 3mm and the number of points of 600 to 800 points per square are chiseled on the concrete bonding surface on the surface of the tower footing base by adopting an electric pick so as to ensure the bonding effect of the new and old structures.
3. The secondary pouring method for the tower foot of the communication tower according to claim 1, wherein in the first step, the process of placing the square PVC pipe is as follows: square PVC pipes with high inside and low outside and 1% gradient are respectively placed in 4 directions perpendicular to each other, and the length of the square PVC pipes is the distance between the inner wall of the tower body and the outer mold.
4. The secondary pouring method for the tower foot of the communication tower according to claim 1, wherein in the second step, before foaming, a cut is cut out on the circular PVC pipe, the bolt at the tower bottom is sleeved, the PVC pipe is fixed by the steel wire, the PVC pipe is tightly attached to the outer side of the bolt, and after foaming of the foaming agent is completed, the PVC pipe is removed.
5. The secondary pouring method for the tower foot of the communication tower according to claim 1, wherein in the third step, the flexible metal plate is a recyclable galvanized iron plate with a height of 25 cm-35 cm and a length of 2-3 flange diameters.
6. The secondary pouring method for the tower foot of the communication tower as claimed in claim 5, wherein in the third step, the outer side of the outer template is fixed by steel wires, so that the template is prevented from shifting, falling and cracking under the action of self stress and lateral pressure of the fine stone grouting material, and a PVC pipe is used as an inner support between the inner side and the upper flange plate.
7. The method for secondary pouring of the tower foot of the communication tower according to claim 5, wherein in the fourth step, the fine stone grouting material is poured into a stirring container, and is stirred for at least 3min by a handheld stirrer to obtain the fine stone grouting material with excellent flowing property.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117185730A (en) * | 2023-09-27 | 2023-12-08 | 中国铁塔股份有限公司奉节分公司 | High-strength shrinkage-free secondary pouring filling material for iron tower feet and pouring process of high-strength shrinkage-free secondary pouring filling material |
| CN117185730B (en) * | 2023-09-27 | 2024-04-26 | 中国铁塔股份有限公司奉节分公司 | High-strength shrinkage-free secondary pouring filling material for iron tower feet and pouring process of high-strength shrinkage-free secondary pouring filling material |
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| CN117185730A (en) * | 2023-09-27 | 2023-12-08 | 中国铁塔股份有限公司奉节分公司 | High-strength shrinkage-free secondary pouring filling material for iron tower feet and pouring process of high-strength shrinkage-free secondary pouring filling material |
| CN117185730B (en) * | 2023-09-27 | 2024-04-26 | 中国铁塔股份有限公司奉节分公司 | High-strength shrinkage-free secondary pouring filling material for iron tower feet and pouring process of high-strength shrinkage-free secondary pouring filling material |
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Effective date of registration: 20210609 Address after: No. 307, Zhongshan East Road, Xuanwu District, Nanjing, Jiangsu, 210016 Patentee after: JIANGSU BRANCH OF CHINA TOWER Co.,Ltd. Patentee after: YANCHENG BRANCH, CHINA TOWER Co.,Ltd. Address before: 224000 building 6, big data phase II, No.35 Xuehai Road, Xindu street, Chengnan New District, Yancheng City, Jiangsu Province (CND) Patentee before: YANCHENG BRANCH, CHINA TOWER Co.,Ltd. |