CN110792082A - Construction method for soundless crushing and dismantling of preformed hole - Google Patents
Construction method for soundless crushing and dismantling of preformed hole Download PDFInfo
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- CN110792082A CN110792082A CN201910884055.6A CN201910884055A CN110792082A CN 110792082 A CN110792082 A CN 110792082A CN 201910884055 A CN201910884055 A CN 201910884055A CN 110792082 A CN110792082 A CN 110792082A
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- 238000010276 construction Methods 0.000 title claims abstract description 46
- 239000004567 concrete Substances 0.000 claims abstract description 31
- 238000009826 distribution Methods 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 3
- 230000002829 reductive effect Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 9
- 230000003068 static effect Effects 0.000 description 6
- 238000005422 blasting Methods 0.000 description 3
- 238000007728 cost analysis Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 108090000397 Caspase 3 Proteins 0.000 description 1
- 102100029855 Caspase-3 Human genes 0.000 description 1
- 108010068370 Glutens Proteins 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 235000021312 gluten Nutrition 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a construction method for soundless crushing and dismantling of a preformed hole, which comprises the following steps of firstly, construction preparation and hole distribution parameter design; step two, embedding PVC pipes in the supporting structure; step three, pouring concrete; and step four, after the concrete is initially set and the hole collapse is determined not to occur, pulling out the PVC pipe, so that a filling hole is formed on the supporting structure. The construction method for the soundless crushing and dismantling of the preformed hole has the advantages of high construction speed, good safety performance, small environmental influence and low comprehensive cost.
Description
The technical field is as follows:
the invention relates to the field of buildings, in particular to a construction method for soundless crushing and dismantling of a preformed hole.
Background art:
along with the continuous development of urbanization construction, the urban building density is higher and higher. Deep foundation pit supporting construction is carried out in a building dense area, and in order to ensure the safe and normal operation of nearby buildings, underground pipelines and urban traffic, a reinforced concrete inner support system is generally adopted. When the temporary support system is removed, blasting removal, mechanical removal, manual removal, post-drilling static blasting removal and the like are adopted as conventional methods. However, the construction methods have certain defects in the aspects of safety, quality, progress, cost and environmental protection.
The invention content is as follows:
the invention aims to solve the technical problem of providing a construction method for soundless crushing and dismantling of a reserved hole, which has the advantages of high construction speed, good safety performance, small environmental influence and low comprehensive cost.
The technical scheme of the invention is to provide a construction method for soundless crushing and dismantling of a preformed hole, which is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
firstly, construction preparation is carried out, and hole distribution parameters are designed;
step two, embedding PVC pipes in the supporting structure;
step three, pouring concrete;
after the concrete is initially set and hole collapse is determined not to occur, pulling out the PVC pipe to form a pouring hole on the supporting structure;
step five, preparing a crushing agent slurry;
step six, pouring the crushing agent slurry into the pouring hole;
step seven, expanding and crushing the supporting structure;
eighthly, cutting concrete at the support;
and step nine, manual or mechanical clearing and transporting.
Preferably, after the supporting structure is expanded and crushed, a small amount of structures which do not reach the crushing effect are subjected to local crushing treatment by an air pick.
Preferably, in the fourth step, the PVC pipe is pulled out within 30min after the initial setting of the concrete, in order to determine the appropriate time for pulling out the pipe, the pipe can be tried to be pulled out after the initial setting of the concrete, the PVC pipe is pulled out in time after the hole collapse is determined not to occur, and the PVC pipe is appropriately rotated before the pipe is pulled out, so that the friction with the hole wall is reduced.
Preferably, in the sixth step, the hole cavity of the pouring hole needs to be cleaned before the breaker slurry is poured into the hole, and no accumulated water or impurities exist.
Preferably, in step six, the poured-out breaker slurry is ensured to be continuous without interruption to prevent the formation of an air interlayer until the hole is filled.
Further, the method comprises the following steps: and seventhly, after the support structure generates the initial cracks, pouring seams by using water to accelerate the expansion effect of the support structure.
Compared with the prior art, the invention has the following advantages after adopting the scheme: in the construction process, the noise is low, flying stones and dust are avoided, the construction period is particularly shortened, the influence on the surrounding environment is minimized on the basis of accelerating the construction progress, and the comprehensive cost is low.
The specific implementation mode is as follows:
the invention is further illustrated with respect to specific embodiments below:
example 1
A construction method for soundless crushing and dismantling of a preformed hole is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
step one, construction preparation, namely, compiling a special construction scheme for the safety of the foundation pit enclosure based on the foundation pit enclosure design scheme passed by expert demonstration, and implementing after the foundation pit enclosure safety is reviewed by a supervision unit and a construction part is confirmed;
and designing hole distribution parameters, and determining the hole depth, the hole diameter and the hole pitch of the reserved hole of the support beam according to the general design parameters of the hole distribution of the crushing agent. See Table 1 for details
Table 1 general crush design parameter table
Note: (H-designed crushing height value of the medium to be crushed).
The hole distance is within the parameter range, the concrete strength grade and the concrete crushing requirement of a construction site can be combined to be revised automatically, the ratio of the hole distance to the hole diameter is called as the crushing coefficient K, and the K values of the crushed objects with different strengths are different. The corresponding relation is as follows: and A is kD (see table 2 in detail), and a final hole distance value can be determined according to the conversion relation of the table and the field actual. (generally, the ratio of pitch to aperture is about 10 times, the aperture is large, the pitch can be increased, and the aperture is small, the pitch must be decreased). The prepared holes on the periphery of the dense reinforcing steel bars are appropriately dense so as to ensure the cracking effect of the concrete of the support beam.
3) Drawing a layout drawing of the reserved holes, and exchanging the soundless breaking and dismantling special construction scheme to the technical, safety and environmental protection of a construction team.
TABLE 2 crushing coefficient K value table
Note: is suitable for supporting beams with the aperture within 45 mm.
Step two, embedding PVC pipes in the supporting structure; specifically, the method comprises the following steps of manufacturing and fixing the PVC pipe: selecting a PVC plastic pipe meeting the requirements, cutting the PVC plastic pipe into a fixed length, wherein the length is generally as follows: is 100 mm-200 mm higher than the beam surface. One end of the plastic pipe is sealed by a waterproof transparent adhesive tape; binding and fixing the PVC pipes: at a steel bar binding stage of a supporting beam, fixing the PVC pipe on a stirrup of the beam according to a design position: the distance between the bottom of the pipe and the bottom surface of the beam is 100 mmm; three iron wires are bound and fixed (the first is about 100mm away from the bottom of the pipe, the middle of the second beam and the third is beam gluten). And corresponding measures are taken to prevent the PVC pipe from floating upwards.
Step three, pouring concrete; special construction is carried out before concrete pouring, the vibrating rod is prevented from being in direct contact with the plastic pipe during pouring, and when concrete is poured, a professional cares the pre-buried pipe, so that the pre-buried pipe which floats upwards, has serious deviation and is inclined is corrected and fixed in time.
After the concrete is initially set and hole collapse is determined not to occur, pulling out the PVC pipe to form a pouring hole on the supporting structure; and pulling out the PVC pipe within 30min after the initial setting of the concrete. In order to determine the appropriate time for pipe drawing, the pipe drawing can be tried after the concrete is initially set, and the PVC pipe can be drawn out in time after the hole collapse is determined not to occur. Before drawing the tube, the PVC tube should be properly rotated to reduce the friction with the hole wall. After being pulled out, the materials are uniformly and intensively stacked and cleaned for later use.
Step five, preparing a crushing agent slurry; the mixing proportion is strictly controlled, namely the water amount is 28-33% of the weight of the crushing agent (1.4 kg-1.65 kg of water is used for 5 kg of the crushing agent per small bag), the crushing agent is visually observed to be uniform slurry with fluidity, water is not needed to be added more, otherwise the crushing effect is reduced sharply, the crushing agent is a general crushing expanding agent in the industry, no specific model limitation exists, the crushing agent SCA-1 in the embodiment meets the requirements of JC506 'Silent crushing agent' industry standard. The stirring time of the slurry is generally 40-90 s, the slurry after stirring can generate heat and gradually lose fluidity after standing for a period of time, and the operation is finished 10min after the slurry is mixed.
Step six, pouring the crushing agent slurry into the pouring hole; the pore space needs to be cleaned (can be blown clean by high-pressure air) before the hole is filled, and accumulated water and impurities cannot be generated; PVC protective glasses are needed during hole filling construction. The prepared and stirred slurry is continuously and compactly poured into the holes according to the pouring hole sequence of ' four sides first, then middle ', first outer side and then inner side '. The slurry poured out of the barrel is ensured to be continuous without interruption to prevent the formation of air interlayers until the holes are filled. The once-stirred slurry is used up as soon as possible within 10 min. The vertical hole is directly filled with the holes, the filling hole is dense, and the hole opening is not required to be blocked after the filling; in order to accelerate the hole filling speed and ensure the hole filling quality, the vertical hole grouting can also adopt funnel auxiliary operation; when the environmental temperature of the construction site is above 10 ℃, a covering is not required to be added after grouting (except in rainy days). When the environmental temperature of the construction site is below 10 ℃, the construction site needs to be covered by straw bags, gunny bags and the like for heat preservation.
Step seven, expanding and crushing the supporting structure; after grouting, the cracking time of the support beam is different according to the air temperature and the structural type of the crushed body. At normal temperature, the hydration starts to be generated 30-40 min after grouting, initial cracks start to be generated on the working face after the reaction time is 3-5 h, the cracks are continuously enlarged after 7-10 h, and more than 70% of the total crushing effect can be achieved after 12-15 h. The higher the temperature, the shorter the cracking time; after the initial crack is produced, the seam may be watered to accelerate its expansion. Pouring the seam with common clear water at normal temperature; when the temperature is lower than 10 ℃, warm water at about 40 ℃ is preferably used for pouring the seam.
And step eight, in order to ensure the safety of the support system, the concrete at the support seat is not buried in the embedded holes within 500mm for crushing. The concrete support beam at the joint with the crown beam can assist in the cutting by a static cutting method.
And step nine, after the supporting beam is completely crushed, loosening by adopting a manual matching machine (such as an air pick, a prying bar and the like), and then carrying out manual or mechanical clearing.
The working principle is as follows, before concrete pouring, the PVC pipe is embedded in the supporting structure according to design requirements, after the concrete is initially set, the PVC pipe is properly rotated, the PVC pipe is pulled out after the hole collapse is avoided, and therefore a reserved hole is formed. When the supporting structure system needs to be dismantled, the crushing agent is poured into the reserved hole, the crushing agent slowly generates chemical and physical reactions in the concrete, the volume is continuously expanded, the temperature is continuously increased to extrude the surrounding concrete, and when the expansion force exceeds the tensile strength value of the concrete, the concrete is subjected to silent crushing from inside to outside. The concrete supporting beam at the joint of the crown beam can be removed by the aid of static cutting technology.
The method is suitable for dismantling the temporary reinforced concrete supporting structure, and is particularly suitable for dismantling the reinforced concrete inner supporting structure of the deep foundation pit in the dense building area.
Compared with the conventional post-drilling static explosion method for dismantling, the method has the advantages that the construction period is saved by 10 days, the comprehensive cost is saved by 63769 yuan, and the cost can be saved by 30%; compared with the manual mechanical dismantling, the construction period is saved by 40 days, the comprehensive cost is saved by 212567 yuan, the cost can be saved by 60%, and the concrete results are shown in tables 3-6.
TABLE 3 soundless crushing demolition construction cost analysis meter for preformed hole
Construction period: 20 days dismantling engineering quantity: 500m3Reference to market price for labor cost
TABLE 4 Back borehole static blasting demolition construction cost analysis chart
Construction period: demolition work volume in 30 days: 500m3Reference to market price for labor cost
TABLE 5 Manual demolition construction cost analysis chart
Construction period: demolition work volume in 60 days: 500m3Reference to market price for labor cost
TABLE 6 comprehensive economic benefits comparison table
| Name of art | Demolition cost | Construction period expense (Yuan/Tian) | Comparison of composite costs |
| Soundless crushing and dismantling of preformed hole | 81283 | 5000 yuan/day × 20 100000 | 181283 yuan |
| Post-drilling static explosion demolition | 116102 | 5000 yuan/day × 30 150000 | 266102 yuan |
| Manually demolish | 156750 | 5000 yuan/day 60-300000 | 456750 yuan |
The construction period cost is 5000 yuan/day, namely turnover material lease cost, handling cost, manager wages and fund occupation loan interest
As can be seen from the above table: the comprehensive cost of the silent crushing and dismantling of the preformed hole is lowest, the cost performance is highest, and the method is suitable for wide popularization.
The foregoing is illustrative of the preferred embodiments of the present invention only and is not to be construed as limiting the claims. All the equivalent structures or equivalent process changes made by the description of the invention are included in the scope of the patent protection of the invention.
Claims (6)
1. A construction method for soundless crushing and dismantling of a preformed hole is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
firstly, construction preparation is carried out, and hole distribution parameters are designed;
step two, embedding PVC pipes in the supporting structure;
step three, pouring concrete;
after the concrete is initially set and hole collapse is determined not to occur, pulling out the PVC pipe to form a pouring hole on the supporting structure;
step five, preparing a crushing agent slurry;
step six, pouring the crushing agent slurry into the pouring hole;
step seven, expanding and crushing the supporting structure;
eighthly, cutting concrete at the support;
and step nine, clearing and transporting.
2. The preformed hole silent crushing demolition construction method according to claim 1, characterized in that: after the supporting structure is expanded and crushed, a small amount of structures which do not reach the crushing effect are subjected to local crushing treatment by the air pick.
3. The preformed hole silent crushing demolition construction method according to claim 1, characterized in that: and in the fourth step, the PVC pipe is pulled out within 30min after the concrete is initially set, in order to determine the appropriate time for pulling out the pipe, the pipe can be tried to be pulled out after the concrete is initially set, the PVC pipe is timely pulled out after the hole collapse is determined not to occur, and the PVC pipe is appropriately rotated before the pipe is pulled out, so that the friction with the hole wall is reduced.
4. The preformed hole silent crushing demolition construction method according to claim 1, characterized in that: and in the sixth step, before the hole is filled with the crushing agent slurry, the hole cavity of the filling hole needs to be cleaned, and water accumulation and impurities cannot be caused.
5. The preformed hole silent crushing demolition construction method according to claim 1, characterized in that: and in the sixth step, the poured breaking agent slurry is ensured to be continuous without interruption so as to prevent an air interlayer from being formed until the hole is filled.
6. The preformed hole silent crushing demolition construction method according to claim 1, characterized in that: and seventhly, after the support structure generates the initial cracks, pouring seams by using water to accelerate the expansion effect of the support structure.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114061390A (en) * | 2020-07-30 | 2022-02-18 | 神华神东煤炭集团有限责任公司 | Blasting demolition method for artificial dam body |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233476A (en) * | 2013-04-03 | 2013-08-07 | 巨匠建设集团有限公司 | Deep foundation pit supporting structure as well as construction method and demolishing method thereof |
| CN104404965A (en) * | 2014-11-05 | 2015-03-11 | 浙江海洋学院 | Method for removing reinforced concrete support beams in foundation pit support |
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- 2019-09-19 CN CN201910884055.6A patent/CN110792082A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233476A (en) * | 2013-04-03 | 2013-08-07 | 巨匠建设集团有限公司 | Deep foundation pit supporting structure as well as construction method and demolishing method thereof |
| CN104404965A (en) * | 2014-11-05 | 2015-03-11 | 浙江海洋学院 | Method for removing reinforced concrete support beams in foundation pit support |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114061390A (en) * | 2020-07-30 | 2022-02-18 | 神华神东煤炭集团有限责任公司 | Blasting demolition method for artificial dam body |
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