CN113914378A - Method suitable for preventing water leakage during post-opening pile pressing hole pile sealing - Google Patents
Method suitable for preventing water leakage during post-opening pile pressing hole pile sealing Download PDFInfo
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- CN113914378A CN113914378A CN202111331769.8A CN202111331769A CN113914378A CN 113914378 A CN113914378 A CN 113914378A CN 202111331769 A CN202111331769 A CN 202111331769A CN 113914378 A CN113914378 A CN 113914378A
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- 238000003825 pressing Methods 0.000 title claims abstract description 61
- 238000007789 sealing Methods 0.000 title claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 29
- 239000004567 concrete Substances 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- 239000003292 glue Substances 0.000 claims abstract description 16
- 238000003466 welding Methods 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 238000007788 roughening Methods 0.000 claims abstract description 10
- 238000004873 anchoring Methods 0.000 claims abstract description 6
- 238000012423 maintenance Methods 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims abstract description 5
- 238000007689 inspection Methods 0.000 claims abstract description 4
- 230000003068 static effect Effects 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 22
- 230000000694 effects Effects 0.000 abstract description 7
- 230000002265 prevention Effects 0.000 abstract description 5
- 239000000565 sealant Substances 0.000 description 7
- 230000002787 reinforcement Effects 0.000 description 4
- 239000004568 cement Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Foundations (AREA)
Abstract
The invention discloses a method for preventing water leakage of a post-opened pile hole sealing pile, which comprises the following steps of: 1) forming a pile pressing hole, installing anchoring steel bars on the pile top, and pouring concrete in the pile pressing hole; 2) flaring treatment; 3) roughening treatment; 4) cleaning broken slag; 5) sealing the pile for the first time; 6) removing the load holding frame after the first pile sealing maintenance, and performing concrete surface leakage inspection; 7) laying water stop glue; 8) welding two-way steel bars on the bottom plate surface; 9) and (5) sealing the pile for the second time. The construction method is simple and easy to realize, and the flaring step treatment prolongs the water permeation path and plays a role in water prevention; the treatment of the roughening process increases the occlusal surface of the grouting material and the inner wall of the pile pressing hole, so that the compactness of the grouting material and the pile pressing hole is improved, and the anti-seepage effect is improved; and the waterproof glue is continuously and uniformly laid in the hook groove with the hole top of 100mm downwards, so that the pile hole is further ensured not to leak.
Description
Technical Field
The invention belongs to the technical field of existing building foundation reinforcement construction, and particularly relates to a method suitable for preventing water leakage during post-opening pile hole sealing.
Background
The anchor rod static pressure pile can be used for pile foundation reinforcement and building settlement control of new construction or existing construction engineering. For new construction, a reserved method is usually adopted for pile pressing holes, and waterproof treatment of pile heads is easy to solve; the method is used for existing building engineering, the static water drilling coring pore-forming is often adopted on a raft (bearing platform), the waterproof leakage during pile sealing after pile pressing is completed is a big difficulty, the current common method is that the concrete self-waterproof pile sealing is directly adopted without any treatment on the wall of a pile sealing hole, the construction method is easy to cause leakage to the bottom plate surface along the wall of the pile pressing hole along with the rise of the water level of the basement, and the water leakage point is larger and larger along with the lapse of time, so that the normal use of the basement is directly influenced. Therefore, a method suitable for preventing water leakage of post-opening pile hole sealing is provided, so that the leakage of the pile hole sealing is avoided.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for preventing water leakage of a post-open pile hole sealing pile.
The invention is realized by the following technical scheme:
the method for preventing water leakage of the post-opened pile hole sealing pile comprises the following steps:
1) static water drilling cores on a raft plate of a basement of an existing building to form pile pressing holes, after the sinking of the steel pipe piles is completed, anchoring reinforcing steel bars are installed on the pile tops, and concrete is poured in the pile pressing holes;
2) flaring of the pile pressing hole opening;
3) performing chiseling treatment on the inner wall surface of the upper section hole of the pile pressing hole after flaring treatment;
4) cleaning up crushed slag on the surfaces of new and old concrete and in pile pressing holes;
5) sealing the pile for the first time, pouring the pile by adopting high-strength non-shrinkage grouting material until the pouring height reaches the lowest part of the chiseling treatment, and normally curing the grouting material for the first time for 3-5 days;
6) removing the load holding frame after the first pile sealing maintenance, and performing concrete surface leakage inspection;
7) chiseling grooves with the width and depth of 20mm at the position 100mm below the top of the orifice along the wall of the hole, and continuously and uniformly laying water stop glue in the grooves;
8) welding two-way steel bars on the bottom plate surface;
9) and (5) sealing the pile for the second time, pouring high-strength non-shrinkage grouting material to the top of the orifice, and watering and maintaining for no less than 7 days.
Furthermore, the flaring processing means that concrete with the thickness of 145-155mm is manually chiseled in the range of 5d +30mm around the original pile pressing hole opening, so that the pile pressing hole opening is stepped. The arrangement prolongs the permeation path of water and can also play a role in water prevention.
Further, the height of the roughening treatment is in a height range of not more than 600mm from the position of the pile hole opening. The roughening treatment is mainly used for increasing the occlusion surface between grouting material and the inner wall of a pile hole and improving the compactness.
Further, the hook groove with the width and the depth of 20mm is chiseled off along the hole wall at the position 100mm below the top of the hole opening after the first pile sealing maintenance, so that the permeation path of water is increased, and the anti-seepage effect is further achieved.
Furthermore, the water stop glue is continuously and uniformly laid in the hook groove, and the water stop glue has a double-sealing water stop mechanism of elastic water stop of rubber and volume expansion water stop of the water stop glue after meeting water.
Furthermore, the self material of the sealing pile adopts self-waterproof cement-based grouting material, the strength grade is not less than C45, and the vertical expansion rate is 0.1-3.5% in 3 hours.
The invention aims at the pile sealing water leakage prevention method of the post-opening pile pressing hole, the construction method is simple and easy to realize, and the flaring step treatment of the orifice plays a role in prolonging the permeation path of water and also can play a role in preventing water; the roughening process increases the engaging surface between the grouting material for sealing the pile and the inner wall of the pile pressing hole, so that the compactness between the grouting material and the inner wall of the pile pressing hole is improved, and the anti-seepage effect is improved; and the waterproof glue is continuously and uniformly laid in the hook groove with the hole top of 100mm downwards, so that the pile hole is further ensured not to leak.
Drawings
FIGS. 1-2 are schematic views of a loading stake seal of the present invention;
FIG. 3 is a process flow diagram of a construction process of an anchor rod static pressure steel pipe pile in a construction example;
in the figure, A is a basement raft of an existing building, B is a flaring and roughening part, C is a first pile sealing section, D is a second pile sealing section, E is a groove, and F is water stop glue.
Detailed Description
The invention is further described below in conjunction with the drawings of the specification in order to better understand the technical solution.
The invention relates to a method for preventing water leakage of a post-opened pile hole sealing pile, which comprises the following steps: forming a pile pressing hole → pressing a pile, filling a core → flaring of the pile hole → roughening the wall of the pile hole, cleaning the hole → installing a loading pier to support the load → first pouring, maintaining → checking, treating water leakage → grooving at a position 100mm below the top of the hole, brushing water stop glue → second pouring and maintaining.
The concrete construction steps are as follows:
1) static water drilling cores on a raft plate of a basement of an existing building to form pile pressing holes, after the sinking of the steel pipe piles is completed, anchoring reinforcing steel bars are installed on the pile tops, and concrete is poured in the pile pressing holes;
2) flaring treatment of a pile pressing hole opening: concrete with the thickness of 145-155mm is chiseled manually within the range of 5d +30mm around the opening of the original pile pressing hole, the concrete with the thickness of 150mm is optimized, the opening of the pile pressing hole is in a step shape, the arrangement mainly has a buffer effect, so that leakage water is diffused to the periphery of the opening along the edge of the opening, and the upward time of the leakage water is delayed;
3) performing chiseling treatment on the inner wall surface of the upper section hole of the pile pressing hole after flaring treatment; the height of the chiseling treatment is within the range of 380-420mm from the position of the opening of the pile pressing hole downwards, preferably 400mm, the part with the high chiseling treatment is a secondary pile sealing section, and the chiseling treatment is mainly used for increasing the meshing surface between grouting material and the inner wall of the pile pressing hole, improving the compactness and further improving the anti-seepage effect;
4) cleaning up crushed slag on the surfaces of new and old concrete and in pile pressing holes;
5) sealing the pile for the first time, pouring the pile by adopting high-strength non-shrinkage grouting material until the pouring height reaches the lowest part of the chiseling treatment, and self-recognizing and maintaining the grouting material for the first time for 3-5 days; the first pile sealing section is from the pile top base plate to the lowest part of the chiseling treatment; the segment is about 500mm high;
6) removing the load holding frame after the first pile sealing maintenance, and performing concrete surface leakage inspection;
7) chiseling grooves with the width and depth of 20mm at the position 100mm below the top of the orifice along the wall of the hole, and continuously and uniformly laying water stop glue in the grooves;
8) welding two-way steel bars on the bottom plate surface;
9) and (3) sealing the pile for the second time, pouring high-strength non-shrinkage grouting material to the top of the hole, watering and maintaining for at least 7 days, wherein the strength grades of the high-strength non-shrinkage grouting material used for sealing the pile for the first time and the pile for the second time are not less than C45.
The invention is further explained by combining the figures 1-2, in the figure 1, A is a basement raft of the existing building, B is a flaring and roughening part, the whole height of the part is 400mm, C is a first pile sealing section and is 500mm high, C40 high-strength non-shrinkage grouting material is used for pouring, a jack is removed to seal a pile frame after curing for 3-5 days, then a second pile sealing material is poured, D is a second pile sealing section and is 400mm high, and C40 high-strength non-shrinkage grouting material is used for pouring.
The invention aims at the pile sealing water leakage prevention method of the post-opening pile pressing hole, the construction method is simple and easy to realize, and the flaring step treatment of the hole opening is convenient to prolong the water permeation path effect and can also play a role in water prevention; the roughening process increases the engaging surface between the grouting material for sealing the pile and the inner wall of the pile pressing hole, so that the compactness between the grouting material and the inner wall of the pile pressing hole is improved, and the anti-seepage effect is improved; and the waterproof glue is continuously and uniformly laid in the hook groove with the hole top of 100mm downwards, so that the pile hole is further ensured not to leak.
Construction example: reinforcement treatment engineering for pile foundation of certain 6# building
The basic outline of the project is that a No. 6 building is positioned in a certain residential area of a Hangzhou coastal river area, is a high-rise residential reinforced concrete shear wall structure with 26 layers above the ground and 2 layers below the ground, is provided with a piled raft foundation and a raft plate with the thickness of 1200mm (C35 concrete), adopts pile end post-grouting bored piles, has the pile diameter of 800mm, has the characteristic value Ra of single-pile bearing capacity of =4500KN, takes 9-2 layers of round gravels as a pile end bearing layer, and has the depth of entering the bearing layer of more than or equal to 2.5 m.
When superstructure construction reached 11 layers, through detecting that partial engineering pile length does not reach the design requirement, so adopt stock static pressure steel-pipe pile to carry out the pile foundation reinforcement. The total 35 steel-pipe piles are filled into the building, the pile diameter is 426mm, the wall thickness is 14mm, the material Q355b (straight slit steel pipe), the single pile bearing capacity characteristic value Ra =1900KN takes 9-2 round gravel as the bearing layer, the effective pile length is about 36m, the pile pressing hole adopts static water drilling to get the core and forms a hole on the existing raft, the hole diameter is 480mm at the upper opening, and the lower opening is 530 mm.
The anchor rod static pressure steel pipe pile construction process flow is shown in figure 3.
Embedding an anchor rod: the anchor rod specification phi T32 finish rolling screw-thread steel, adopting post anchoring technology to plant the anchor rod on the raft, drilling the hole with aperture 65mm and hole depth 800mm, internally pouring C60 high-strength non-shrinkage grouting material.
And (3) post-forming a pile pressing hole: the pile pressing hole is formed by adopting a static pressure water drill micro-inclination core hole forming process, 15 holes with the diameter of phi 100 are adopted as the core pressing holes, the size of the pile hole is 480mm in upper opening diameter, 530mm in lower opening diameter and 1450 (1300) mm in hole depth, and the wall of the pile pressing hole needs to be roughened before pile sealing.
Pile sinking construction:
1) checking an anchor rod and a pile machine, cleaning a pile hole, and cleaning the wall of the pile hole;
2) the pile pressing frame needs to be kept vertical, the screw caps of the anchoring screw rods should be screwed up evenly, and the loosened screw caps should be screwed up at any time in the pile pressing construction process;
3) the pile section is in place and must be kept vertical, so that the jack is overlapped with the pile section and the axial line of the pile pressing hole and cannot be biased;
4) pile section sinking is carried out section by section, and pile section sinking and pressing and pile section welding are carried out in a staggered mode. The first three sections are slowly pressed in, and good verticality must be kept, and the inclination rate is less than 1%;
5) the subsequent connection must guarantee that the pile body is straight up and down, the pile is prohibited from correcting and pressing, the overlapping of filling pieces is prohibited, the pile pressing construction cannot be stopped in the middle, and the pile pressing construction should be in place at one time;
6) the pile section welding quality is particularly important, and each set of pile pressing machinery is specially provided with 1 professional welder and is responsible for the welding operation construction of the steel pipe pile. After the upper pile section and the lower pile section are vertically aligned, the semi-automatic gas protection butt fusion welding connection of the groove of the lining ring is adopted. The welding quality is in accordance with the regulations of the national current standard of 'acceptance of construction quality of steel structure engineering' GB5025 and 'welding technical code of building steel structure' JGJ 81;
7) in the pile pressing process, a specially-assigned person is required to be responsible for commanding operation, the specially-assigned person carries out reading record of a pressure gauge and draws a pressure curve, and if an abnormality is found, related record conditions are immediately reported to a technician so as to judge whether pile sinking quality meets requirements;
8) pile pressing termination standard: the double-control standard is adopted, the pile pressing depth (the steel pipe pile bearing layer is a 9-2 round gravel layer, the depth of the steel pipe pile bearing layer is required to be more than 1.5 m) is controlled, and the final pile pressing force is controlled. The control of the final pile pressing force is mainly used. Generally, the pressure is required to be more than or equal to 3.0-3.5 Ra, and the final re-pressing is carried out for 5-6 times (after the standard is reached).
And (3) core filling construction in the pipe: manually pouring the core in the pile tube, checking whether water is accumulated in the pile tube before core pouring, and pouring 0.3-0.50 m3 cement paste to wet the tube wall and the tube bottom and then pouring concrete into the core if no water is in the tube; if the accumulated water in the pipe is more, underwater concrete can be adopted for pouring; the section of about 8-12m of the upper part of the filling core in the pile pipe is inserted into a vibrating rod and is vibrated to be compact.
Pile sealing:
1) manually arranging a lengthened electric hammer and an electric pick to chisel the surface of the upper section of the hole at the periphery of the hole wall of the pile pressing hole within the height range of about 600 mm;
2) manually chiseling concrete with the thickness of about 150mm in the range of 5d +30 of the pile pressing opening edge to form a step shape;
3) cleaning up crushed slag on the surfaces of new and old concrete and in pile pressing holes;
4) after cleaning, installing a loading pier, a jack and a reaction frame on the pile top, and carrying out load holding locking on the jack according to the design load holding force requirement;
5) c45 high-strength shrinkage-free grouting material is adopted for pouring the primary pile sealing to form the secondary pile sealing with the pouring height of 400mm, and the grouting material for the primary pile sealing is naturally cured for about 3 days;
6) removing the jack pile sealing frame (load holding frame) after the grouting material is maintained, checking whether the concrete surface has leakage, and sealing the pile for the second time after completing the injection sealing by adopting HK epoxy resin if the concrete surface has leakage;
7) the P201 waterproof glue is continuously and uniformly laid in the hook groove with the hole top of 100mm downwards, and the concrete requirements are as follows: a. cleaning the surface of concrete; b. placing the sealant into a sealant extruding gun, opening the front end of the sealant, screwing a glue nozzle, and cutting the size and the width of the glue nozzle according to the width requirement of the groove; c. extruding the sealant into the construction joint by using a sealant extruding gun; d. the applied sealant is prevented from contacting with water until the sealant is cured;
8) and (3) welding two-way reinforcing steel bars on the bottom plate surface, and performing secondary pile sealing, wherein the secondary pile sealing is formed by pouring C45 (J45) high-strength non-shrinkage grouting material with the height of about 400mm, and watering and maintaining for not less than 7 days.
After the project is constructed according to the method, the leakage phenomenon does not occur in the pile pressing hole in rainy season, and the method is an effective waterproof leakage method for the post-opening pile sealing.
Claims (5)
1. A method for preventing water leakage of a post-opened pile hole sealing pile is characterized by comprising the following steps:
1) static water drilling cores on a raft plate of a basement of an existing building to form pile pressing holes, after the sinking of the steel pipe piles is completed, anchoring reinforcing steel bars are installed on the pile tops, and concrete is poured in the pile pressing holes;
2) flaring of the pile pressing hole opening;
3) performing chiseling treatment on the inner wall surface of the upper section hole of the pile pressing hole after flaring treatment;
4) cleaning up crushed slag on the surfaces of new and old concrete and in pile pressing holes;
5) sealing the pile for the first time, pouring the pile by adopting high-strength non-shrinkage grouting material until the pouring height reaches the lowest part of the chiseling treatment, and normally curing the grouting material for the first time for 3-5 days;
6) removing the load holding frame after the first pile sealing maintenance, and performing concrete surface leakage inspection;
7) chiseling grooves with the width and depth of 20mm at the position 100mm below the top of the orifice along the wall of the hole, and continuously and uniformly laying water stop glue in the grooves;
8) welding two-way steel bars on the bottom plate surface;
9) and (5) sealing the pile for the second time, pouring high-strength non-shrinkage grouting material to the top of the orifice, and watering and maintaining for no less than 7 days.
2. The method as claimed in claim 1, wherein the flaring process is performed by chiseling 145-155mm thick concrete around 5d +30mm of the original pile hole opening to form a step shape.
3. The method for preventing water leakage of post-open pile-hole sealing in accordance with claim 1, wherein the height of the roughening treatment is up to 600mm from the position of the pile-hole opening.
4. The method for preventing water leakage of post-driven pile hole sealing pile according to claim 1, wherein the concrete surface is sprayed with water-stop glue after the second pile sealing maintenance.
5. The method for preventing water leakage of post-driven pile hole sealing pile as claimed in claim 1, wherein the high-strength non-shrinkage grouting material has a strength of not less than C45.
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| CN202111331769.8A CN113914378A (en) | 2021-11-11 | 2021-11-11 | Method suitable for preventing water leakage during post-opening pile pressing hole pile sealing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215090A (en) * | 2022-01-13 | 2022-03-22 | 中建八局第二建设有限公司 | Construction method of raft and compression pile in closed space |
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2021
- 2021-11-11 CN CN202111331769.8A patent/CN113914378A/en active Pending
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Application publication date: 20220111 |