CN113090068B - Vacuum pouring process for rush-repairing deep-buried building top concrete structure under limited conditions - Google Patents
Vacuum pouring process for rush-repairing deep-buried building top concrete structure under limited conditions Download PDFInfo
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- CN113090068B CN113090068B CN202110441052.2A CN202110441052A CN113090068B CN 113090068 B CN113090068 B CN 113090068B CN 202110441052 A CN202110441052 A CN 202110441052A CN 113090068 B CN113090068 B CN 113090068B
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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
Abstract
The invention relates to a concrete replacement process, in particular to a vacuum pouring process for rush-repairing a concrete structure at the top of a deeply buried building under a limited condition, which comprises the following steps: s1, setting a safety warning sign and facilities; s2, connecting point type static force cutting concrete; s3, removing the concrete by static force; s4, stopping water and plugging in the deep part; s5, processing an interface; s6, drilling an A-shaped slurry overflowing channel hole and a slurry injecting channel hole; s7, reinforcing and planting steel bars; s8, supporting a top template; s9, pouring the super early-strength and high-strength self-leveling micro-expansion grouting material; s10, detaching the template. According to the vacuum casting process, the A-shaped slurry overflowing channel hole and the grouting channel hole are arranged on the concrete structure at the top of the deep-buried building, and vacuum casting is performed by using low-pressure and low-flow filling equipment, so that a hollow drum and an air-entrapping layer which are formed due to the fact that air cannot be discharged are avoided, and casting compactness and casting strength are guaranteed.
Description
Technical Field
The invention relates to a concrete replacement process, in particular to a vacuum pouring process for rush-repairing a concrete structure at the top of a deeply buried building under a limited condition.
Background
When burying structure top concrete deeply and appearing great damage, form the potential safety hazard, quality defect formed when this type of hidden danger generally is construction stage concreting, in long-term use, the structure receives the influence of all directions pressure, environmental vibrations and outside water invasion, makes the continuous decay of initial function of structure concrete, and reinforcing bar corrosion inflation, top structure concrete disease deepens to cause the top structure concrete damage.
Because the top structure concrete is damaged, the safe use of the whole structure is seriously influenced, and the top structure concrete needs to be treated and repaired. When the damaged part is shallow, layered plastering can be usually adopted for repairing, a construction joint is increased when one layer is added for structural repairing, and the repaired structure still has potential safety hazards; when the damage depth is large, a method of pouring grouting material by using a supporting template is needed, and although the appearance effect of the structure is good, air-entrapping hollows and untight bonding can occur at the material connection part in the structure. For the construction that the operation can not be stopped, such as a building top concrete structure which is buried deeply by more than 5 meters underground and can not be excavated and maintained, a railway tunnel, a highway tunnel, an urban rail transit tunnel and the like, and the repair engineering with short limited maintenance time, the common repair method can not be completed in a short time. The maintenance scheme formed at home and abroad at present causes long-term hidden danger to the whole structure, and the fundamental problem can not be solved by repeated maintenance for many times.
Disclosure of Invention
The invention aims to provide a vacuum pouring process for rush-repairing a concrete structure at the top of a deep-buried building under a limited condition, which is used for solving the problem that the old process needs to repeatedly maintain the top of the deep-buried building after emergency treatment.
The above object of the present invention is achieved by the following technical solutions:
the vacuum pouring process for rush-repairing the concrete structure at the top of the deeply buried building under the limited condition comprises the following steps:
s1, setting safety warning signs and facilities
Arranging a construction isolation region around a damaged concrete part of a building top structure by using color stripe cloth or an isolation rod, and hanging a safety warning sign to remind coming and going personnel;
s2, connecting point type static force segmentation concrete
A broken concrete structure to be dismantled is separated from the whole structure by adopting a contact type mechanical drilling method, the drilling depth is determined according to the dismantling depth, and reinforcing steel bars in the structure cannot be damaged in the drilling process;
s3, concrete is removed by static force
The construction uses a small-sized high-frequency low-vibration concrete breaking and dismantling tool, and the damaged concrete is dismantled statically by adopting a layered elimination method, so that the separation of the reinforcing steel bars and the concrete due to disturbance damage and further the formed relief are avoided;
s4, water and leakage stopping at deep part
Removing the top structure of the damaged concrete, checking the leakage condition, and plugging the leakage part by using a high-density cement permeable crystalline material;
s5, processing interface
Cleaning the interface after removing the damaged concrete, and then coating a high-density cement permeable crystalline material for waterproof and interface connection treatment;
s6, drilling an A-shaped slurry overflowing channel hole and a grouting channel hole
In the space where the damaged concrete is removed, two highest points are selected to respectively drill a slurry overflowing passage hole and a slurry injection passage hole; selecting a highest point in the top concrete structure, drilling holes at an angle of 30-40 degrees obliquely above the highest point, and drilling holes obliquely upwards on the intact concrete structure surface to communicate the drilled holes at the highest point, wherein the two holes form an A-shaped communication structure; the height difference is formed between the highest point of the grouting channel hole and the highest point of the slurry overflowing channel hole, so that all internal air is discharged during pouring, the interior is in a vacuum state, and a gap is not generated due to air during new material pouring, so that the connection stability is not influenced; when a slurry overflowing channel hole and a slurry injection channel hole are drilled, the A-shaped hole must be smoothly connected;
s7, reinforcing and planting steel bars
Reinforcing bars and planting bars damaged in the concrete dismantling process;
s8, supporting the top template
Adhering a sealing strip along the edge of the repair structure, mounting a template on the sealing strip, fixing the template by using expansion bolts, supporting the template by using a scaffold and an ejector rod, and sealing a contact seam between the template and the original concrete structure by using quick-drying glue;
s9, pouring super early strength, high strength self-leveling micro-expansion grouting material
Installing a grouting nozzle in a grouting channel hole, filling the grouting nozzle to the vertex of an A-shaped outer channel by using a medium-pressure low-speed grouting pump, filling the ultra-early-strength high-strength self-leveling micro-expansion grouting material, adjusting the water-cement ratio and the grouting speed according to the pouring volume, sealing the grout overflow channel hole by using an expansion plug when the grout overflows from the grout overflow channel hole after the grouting is saturated, filling and pressurizing to ensure full filling, stopping filling, and sealing the grout overflow channel hole and the grouting channel hole;
s10, detaching the template
The scaffold and the ejector rods can be removed in time according to operation requirements, the template can be removed additionally according to operation time and operation time, and the concrete surface is subjected to detail treatment by using an angle grinder in the later stage.
Optionally, in the step S3, when the concrete is removed by static force, the concrete on two sides of the new pouring position in the previous day must not be removed.
Optionally, in step S4, the PENETRON602 material is directly used for blocking the slight leakage condition; deep punching and high-pressure grouting are carried out on the serious leakage condition, and the PENETRON602 material is used for plugging.
Optionally, in the step S5, the PENETRON 401 is brushed for waterproof and interface connection processing.
Optionally, in step S7, the specifications of the reinforcing steel bars to be repaired and planted are not smaller than those of the original structural reinforcing steel bars, and the reinforcing steel bars are connected by welding.
Compared with the prior art, the invention provides the vacuum pouring process for rush-repairing the concrete structure at the top of the deep-buried building under the limited condition, and the vacuum pouring process has the following beneficial effects:
1. according to the vacuum pouring process, the A-shaped slurry overflowing channel hole and the grouting channel hole are arranged in the concrete structure at the top of the deep-buried building, and vacuum pouring is performed by using low-pressure and low-flow pouring equipment, so that a hollow drum and an air-entrapping layer which are formed due to the fact that air cannot be discharged are avoided, and meanwhile, pouring compactness and pouring strength are guaranteed;
2. according to the vacuum casting process, when the original damaged concrete is removed, a connection-point static force segmentation removal method is adopted, so that the disturbance to the peripheral area and the connection between the reinforcing steel bars and the concrete caused by the vibration of the reinforcing steel bars are reduced, and the possibility of occurrence of hairline seams and structural cracks is reduced;
3. the vacuum pouring process can achieve safe use and meet normal operation within 3.5-4 hours, has short construction time and high strength after repair, ensures the durability and the durability of the concrete structure, and effectively solves the problem that the old process needs to repeatedly maintain the top of the deeply buried building after emergency treatment.
Drawings
FIG. 1 is a construction drawing of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Example (b): referring to fig. 1, the invention provides a vacuum casting process for rush-repairing a concrete structure at the top of a deep-buried building under a limited condition, which comprises the following steps:
s1, setting safety warning signs and facilities
Arranging a construction isolation region around a damaged concrete part of a building top structure by using color stripe cloth or an isolation rod, and hanging a safety warning sign to remind coming and going personnel;
s2, connecting point type static force segmentation concrete
The damaged concrete structure to be removed is separated from the whole structure by adopting a contact type mechanical drilling method, so that the concrete and the internal reinforcing steel bars are prevented from generating a clearance due to strong impact and disturbance when the concrete structure is dug, the disturbance to the intact structure part is reduced, the drilling depth is determined according to the removal depth, and the reinforcing steel bars in the structure cannot be damaged in the drilling process;
s3, concrete is removed by static force
The construction uses a small-sized high-frequency low-vibration concrete breaking and dismantling tool, and the damaged concrete is dismantled statically by adopting a layered elimination method, so that the separation of the reinforcing steel bars and the concrete due to disturbance damage and further the formed relief are avoided; when the concrete is removed by static force, the concrete on two sides of the newly poured part in the previous day cannot be removed;
s4, water and leakage stopping at deep part
Removing the top structure of the damaged concrete, checking the leakage condition, and plugging the leakage part by using a high-density cement permeable crystalline material; in specific implementation, a PENETRON602 material is directly used for plugging a slight leakage condition; deep punching and high-pressure grouting are carried out on the serious leakage condition, and the PEENTRON 602 material is used for plugging; the influence of external flood on construction quality is prevented, and potential safety hazards in the later period are prevented;
s5, processing interface
Cleaning the interface after removing the damaged concrete, and then coating and brushing high-density cement permeable crystalline materials such as a PENETRON 401 and the like to perform waterproof and interface connection treatment, so as to prevent the situations that the interface connection is not firm and compact caused by the inconsistency of new and old materials;
s6, drilling an A-shaped slurry overflowing channel hole and a grouting channel hole
In the space where the damaged concrete is removed, two highest points are selected to respectively drill a slurry overflowing channel hole and a slurry injecting channel hole; selecting a highest point in the concrete structure at the top, drilling holes at 30-40 degrees obliquely above the highest point, and drilling holes obliquely upwards on the intact concrete structure surface to communicate the drilled holes at the highest point, wherein the two holes form an A-shaped communicated structure; the height difference is formed between the highest point of the grouting channel hole and the highest point of the slurry overflowing channel hole, so that all internal air is discharged during pouring, the interior is in a vacuum state, and a gap is not generated due to air during new material pouring, so that the connection stability is not influenced; when a slurry overflow channel hole and a slurry injection channel hole are drilled, the A-shaped hole is required to be smoothly connected;
s7, reinforcing and planting steel bars
Reinforcing bars damaged in the concrete dismantling process are subjected to bar repairing and bar planting; reinforcing steel bars in an original structure can be damaged in the process of dismantling damaged concrete, reinforcing steel bars and planting steel bars are needed to guarantee structural strength and stability, the specifications of the reinforcing steel bars and the planting steel bars are not smaller than those of the reinforcing steel bars in the original structure, and the reinforcing steel bars are connected in a welding mode;
s8, supporting the top template
The method comprises the following steps of (1) sticking a sealing strip along the edge of a repair structure, wherein the sealing strip must be tightly sealed to ensure vacuum pouring, installing a template on the sealing strip and fixing the template by using an expansion bolt to ensure that the surface of the template is smooth, and simultaneously, supporting the template by using a scaffold and an ejector rod to ensure that a supporting structure is firm, and the expansion bolt can prevent insufficient strength of a newly poured structure after the ejector rod support is removed; in order to ensure that the template is in seamless connection with the original concrete structure, the contact seam of the template and the original concrete structure is sealed by using quick-drying glue;
s9, pouring super early strength, high strength self-leveling micro-expansion grouting material
Installing a grouting nozzle in a grouting channel hole, filling the grouting nozzle to the vertex of an A-shaped outer channel by using a medium-pressure low-speed grouting pump, filling the ultra-early-strength high-strength self-leveling micro-expansion grouting material, adjusting the water-cement ratio and the grouting speed according to the pouring volume, sealing the grout overflow channel hole by using an expansion plug when the grout overflows from the grout overflow channel hole after the grouting is saturated, filling and pressurizing to ensure full filling, stopping filling, and sealing the grout overflow channel hole and the grouting channel hole;
the strength of the super-early-strength and high-strength self-leveling micro-expansion grouting material can reach the standard of more than C30 within 3.5-4 hours, so that the grouting material is safe to use and can meet the normal operation, and the strength of the grouting material can reach the standard of more than C50 within 28 days, so that the grouting material has good fluidity, micro-expansion and corrosion resistance, and can fill and compact micro gaps in a structure;
s10, disassembling the template
The scaffold and the ejector rods can be removed in time according to operation requirements, the template can be removed additionally according to operation time and operation time, and the concrete surface is subjected to detail treatment by using an angle grinder in the later stage.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The vacuum pouring process for rush-repairing the concrete structure at the top of the deeply buried building under the limited condition is characterized by comprising the following steps of:
s1, setting safety warning signs and facilities
Arranging a construction isolation region around a damaged concrete part of a building top structure by using color stripe cloth or an isolation rod, and hanging a safety warning sign to remind coming and going personnel;
s2, connecting point type static force segmentation concrete
A broken concrete structure to be dismantled is separated from the whole structure by adopting a contact type mechanical drilling method, the drilling depth is determined according to the dismantling depth, and reinforcing steel bars in the structure cannot be damaged in the drilling process;
s3, concrete is removed by static force
The construction uses a small-sized high-frequency low-vibration concrete breaking and dismantling tool, and the damaged concrete is dismantled by static force by adopting a layered removal method, so that the separation of the reinforcing steel bars and the concrete due to disturbance damage is avoided, and further, the formed relief is avoided;
s4, water and leakage stopping at deep part
Removing the top structure of the damaged concrete, checking the leakage condition, and plugging the leakage part by using a high-density cement permeable crystalline material;
s5, processing interface
Cleaning the interface after removing the damaged concrete, and then coating a high-density cement permeable crystalline material for waterproof and interface connection treatment;
s6, drilling an A-shaped slurry overflowing channel hole and a grouting channel hole
In the space where the damaged concrete is removed, two highest points are selected to respectively drill a slurry overflowing channel hole and a slurry injecting channel hole; selecting a highest point in the top concrete structure, drilling holes at an angle of 30-40 degrees obliquely above the highest point, and drilling holes obliquely upwards on the intact concrete structure surface to communicate the drilled holes at the highest point, wherein the two holes form an A-shaped communication structure; the height difference is formed between the highest point of the grouting channel hole and the highest point of the slurry overflowing channel hole, so that all internal air is discharged during pouring, the interior is in a vacuum state, and a gap is not generated due to air during new material pouring, so that the connection stability is not influenced; when a slurry overflow channel hole and a slurry injection channel hole are drilled, the A-shaped hole is required to be smoothly connected;
s7, reinforcing and planting steel bars
Reinforcing bars damaged in the concrete dismantling process are subjected to bar repairing and bar planting;
s8, supporting the top template
Sticking a sealing strip along the edge of the repairing structure, mounting a template on the sealing strip and fixing the sealing strip by using an expansion bolt, simultaneously using a scaffold and an ejector rod to support the template, and then using quick-drying glue to seal a contact seam between the template and the original concrete structure;
s9, pouring super early strength, high strength self-leveling micro-expansion grouting material
Installing a grouting nozzle in a grouting channel hole, filling the grouting nozzle to the vertex of an A-shaped outer channel by using a medium-pressure low-speed grouting pump, filling the ultra-early-strength high-strength self-leveling micro-expansion grouting material, adjusting the water-cement ratio and the grouting speed according to the pouring volume, sealing the grout overflow channel hole by using an expansion plug when the grout overflows from the grout overflow channel hole after the grouting is saturated, filling and pressurizing to ensure full filling, stopping filling, and sealing the grout overflow channel hole and the grouting channel hole;
s10, detaching the template
The scaffold and the ejector rods can be removed in time according to operation requirements, the template can be removed additionally according to operation time and operation time, and the concrete surface is subjected to detail treatment by using an angle grinder in the later stage.
2. The vacuum casting process for rush-repairing a concrete structure at the top of a deep-buried building under the limited condition according to claim 1, which is characterized in that: in the step S3, when the concrete is removed by static force, the concrete on both sides of the newly poured part in the previous day must not be removed.
3. The vacuum casting process for rush-repairing a concrete structure at the top of a deep-buried building under the limited condition according to claim 1, which is characterized in that: in the step S4, the slight leakage condition is directly blocked by using a PENETRON602 material; deep punching and high-pressure grouting are carried out on the serious leakage condition, and the PENETRON602 material is used for plugging.
4. The vacuum casting process for rush-repairing a concrete structure at the top of a deep-buried building under the limited condition according to claim 1, which is characterized in that: in the step S5, PENETRON 401 is brushed for waterproofing and interface connection.
5. The vacuum casting process for rush-repairing a concrete structure at the top of a deep-buried building under the limited condition according to claim 1, which is characterized in that: and in the step S7, the specifications of the reinforcing steel bars are supplemented and planted to be not less than those of the original structural reinforcing steel bars, and the reinforcing steel bars are connected in a welding mode.
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| CN113653355B (en) * | 2021-08-03 | 2023-03-10 | 中国十七冶集团有限公司 | Construction method for plugging reserved hole of lower laminate of closed space |
| CN114293810A (en) * | 2022-02-23 | 2022-04-08 | 李荣路 | Method for reinforcing stone micro-pressure concrete filled structure |
| CN115025933B (en) * | 2022-06-21 | 2023-09-29 | 中国工程物理研究院化工材料研究所 | Brittle material damage bridging repair method |
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| US20160298329A1 (en) * | 2015-04-07 | 2016-10-13 | Harry A Thompson | Inverted Grout Tube with Angled Fill Spout |
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| JP2005048497A (en) * | 2003-07-30 | 2005-02-24 | Taisei Corp | Method for inhibiting precipitation of efflorescence |
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