AU2021101475A4 - Pier deep foundation pit blasting method capable of controlling flying stone by water coupling soil pressing - Google Patents
Pier deep foundation pit blasting method capable of controlling flying stone by water coupling soil pressing Download PDFInfo
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- AU2021101475A4 AU2021101475A4 AU2021101475A AU2021101475A AU2021101475A4 AU 2021101475 A4 AU2021101475 A4 AU 2021101475A4 AU 2021101475 A AU2021101475 A AU 2021101475A AU 2021101475 A AU2021101475 A AU 2021101475A AU 2021101475 A4 AU2021101475 A4 AU 2021101475A4
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- Australia
- Prior art keywords
- blasting
- holes
- foundation pit
- steel
- pier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 238000005422 blasting Methods 0.000 title claims abstract description 42
- 239000002689 soil Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000004575 stone Substances 0.000 title claims abstract description 20
- 238000003825 pressing Methods 0.000 title claims abstract description 16
- 230000008878 coupling Effects 0.000 title claims abstract description 11
- 238000010168 coupling process Methods 0.000 title claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 239000002360 explosive Substances 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 14
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 239000000839 emulsion Substances 0.000 claims abstract description 4
- 238000007667 floating Methods 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims abstract description 4
- 238000007664 blowing Methods 0.000 claims abstract 2
- 239000002699 waste material Substances 0.000 claims description 6
- 238000005474 detonation Methods 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 241001465754 Metazoa Species 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 6
- 239000000428 dust Substances 0.000 abstract description 2
- 238000009412 basement excavation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 241001417527 Pempheridae Species 0.000 description 2
- 239000010438 granite Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/06—Moles; Piers; Quays; Quay walls; Groynes; Breakwaters ; Wave dissipating walls; Quay equipment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D5/00—Safety arrangements
Landscapes
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The present disclosure discloses a pier deep foundation pit blasting method capable of
controlling flying stone by water coupling soil pressing. The method includes the following
5 steps: cleaning up floating slag, movable stones, and accumulated water on a working face
before drilling holes; perpendicularly drilling holes in designated positions, where the bottoms
of blastholes are basically on the same horizontal plane; clearing the holes after hole drilling is
completed; making stemming, selecting specification emulsion explosives for charging, and
connecting by using non-electric millisecond delay detonators and detonating cords firmly;
o covering a blasting body with steel plates and sandy soil, and finally, filling the gaps in the
blastholes and the gaps below and above the steel plates with water; arranging sandy soil piles to
surround and protect one side, close to high-tension cables, existing lines, residential areas, and
workshops, of a bridge pier, especially the sections close to the high-tension cables and the
existing lines; arranging a blasting warning at each intersection; after a monitor gives a blasting
5 command, blowing, by a blaster, a warning whistle to confirm that a surrounding area is safe
and then starting to detonate; relieving the warning after confirming that there is no danger. The
present disclosure accelerates the construction progress, reduces the blasting vibration velocity,
blasting dust, and noises, ensures the safety of the residential areas and the workshops, solves
the difficult problem that villagers hinder construction, and reduces the economic loss of an
!o enterprise.
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Description
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TECHNICAL FIELD The present disclosure relates to a pier deep foundation pit blasting method capable of controlling flying stone by water coupling soil pressing for effectively eliminating flying stones, and in particular, to a controlled blasting technology of covering sandy soil above a blasting body.
BACKGROUND The grand bridge is 1959.65 m long and has 2 abutments and 58 piers. There are three types of pier foundations: cast-in-situ bored piles, open cut foundations, and well digging foundations. The geological conditions of deep foundations are: plain fill, silty clay, fine coarse sand, and underlying completely weathered to weakly weathered granite in sequence from top to bottom. is The well digging foundation depth of 53# to 58# piers is 6 to 8 m. During on-site construction, the weakly weathered granite is encountered after the average excavation of 2 to 3 m. The grand bridge is located in Laomanzi Village, Pulepu Town, Huanren County, and is close to existing lines, 220KV high-tension cables, workshops, and residential areas. In order to ensure the safety of a transmission line, not a conventional blasting method, but ?o manual and mechanical excavation without a blasting method can be adopted. The progress is too slow.
SUMMARY The objective of the present disclosure is to provide a pier deep foundation pit blasting method capable of controlling flying stone by water coupling soil pressing for effectively eliminating flying stones, so as to solve the problems that flying stones are produced by conventional blasting and excavation, and the non-blasting progress is too slow. The method is practical, efficient, and economic. The technical solution of the present disclosure is that: a pier deep foundation pit blasting method capable of controlling flying stone by water coupling soil pressing is performed according to the following steps: Sl, cleaning up floating slag, movable stones, and accumulated water on a working face before drilling holes, so as to avoid inaccurate hole fixation and drill sticking during a hole drilling process; S2, making ensure that the overall working face is basically flat, the holes are distributed uniformly, and the holes are fixed accurately, perpendicularly drilling the holes by using a pneumatic drill without an air leg, where drill pipes use 018 mm x (1.8 to 4.5 m) hollow hexagonal steel with unequal lengths, a drill bit uses a D42 mm straight alloy steel drill bit, and the bottoming depth of the blastholes are basically on one horizontal plane; S3, after hole drilling is completed, connecting a hole sweeper to compressed air to clean up debris and muddy water in the blastholes, so as to ensure that explosives are charged to bottoms; S4, selecting emulsion explosives with the specification of (30 mm x 200 mm x 200 g, making the stemming with the diameter of (35 mm and the length of about 200 mm on site, which facilitates placing into the blastholes; charging the explosives by using a positive continuous charging structure, where the charge decoupling coefficient K = 45/30 = 1.5; filling remaining blasthole length with the stemming; connecting non-electric millisecond delay detonators and detonating cords with the length of 7.0 m firmly to ensure good electrification, and ensuring that detonator pin wires are intact and are prevented from damage and breakage in subsequent work; S5, in order to avoid detonation interruption, charging one detonator with the same segment 1s number, namely, a segment 1 detonator, in the 5th section of explosives in cut holes charged with much explosive; in rectangular auxiliary holes, additionally charging one detonator with the same segment number, namely, a segment 3 detonator, in the 4th section of explosives of every other three holes, which ensures that all explosives are detonated; S6, covering a blasting body with two steel plates with corresponding area and with the !o thickness of 6 mm, connecting the steel plates in an overlapped manner by using 4 bolts, pressing the steel plates with 2 to 4 pieces of waste section steel, pressing the waste section steel with about 0.5 m thick sandy soil, placing one layer of steel plate, then covering the steel plate with 0.5 m thick sandy soil, and finally, filling the gaps in the blastholes and the gaps below and above the steel plates with water, where in a process of setting up protection, the connecting wires of the detonators are protected to prevent the pin wires and the connecting wires from breakage; S7, arranging sandy soil piles to surround and protect one side, close to high-tension cables, existing lines, residential areas, and workshops, of a bridge pier, where the surrounding and protecting height of the sand soil piles is as high as possible, or arranging color steel plates or bamboo fences to surround and protect, especially the sections close to the high-tension cables and the existing lines; S8, setting the warning distance to be greater than 200 m, arranging a blasting warning at each intersection, evacuating equipment, staff, animals, and the like out of a safety distance of 200 meters, ensuring that all operators wear helmets; S9, implementing a system of chain shooting by a blaster, a monitor and a safety officer, where the safety officer is responsible for blasting warning, the monitor is responsible for commanding, and the blaster blows a warning whistle after the monitor gives a blasting order and then starts detonating after making sure that the surrounding area is safe; checking and eliminating danger 15 minutes after detonating, and relieving the warning after confirming that there is no danger. The present disclosure has the following advantages and beneficial effects: 1. the construction efficiency is greatly improved by adopting a soil pressing blasting technology, which improves the excavation speed from original 0.2 to 0.3 m/d to 3.0 to 4.0m/d, improves the work efficiency by over 13 times, and accelerates the construction speed; 2. the blasting body is covered with the steel plates and the sandy soil, and the water is filled, which eliminates flying stones, and ensures the safety of adjacent high-tension cables and existing railways, reduces the blasting vibration velocity, blasting dust, and noises, ensures the safety of the residential areas and the workshops, controls the disturbance to residents, solves the difficult problem that villagers hinder the construction, and reduces the economic loss of an 1s enterprise. Table 2 shows original blasting conditions and expected blasting effect of 55# pier of Jiangjiapuzi Grand Bridge.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a blasthole layout drawing of a well digging foundation of 55# pier (metering !o dimensions in meters). FIG. 2 is an A-A section view.
DETAILED DESCRIPTION FIGs. 1 to 2 show a controlled blasting technology of covering a blasting body with sandy oil. A specific implementation process is as follows: 1, cleaning up floating slag, movable stones, and accumulated water on a working face before drilling holes, so as to avoid inaccurate hole fixation and drill sticking during a hole drilling process; 2, making ensure that the overall working face is basically flat, the holes are distributed uniformly, and the holes are fixed accurately, perpendicularly drilling the holes by using a YT-29 pneumatic drill without an air leg, where ©18 mm x (1.8 to 4.5 m) hollow hexagonal steel drill pipes with unequal lengths are selected and used, a 042 mm straight alloy steel drill bit is used, and the bottoms of the blastholes are basically on one horizontal plane; 3, after hole drilling is completed, connecting a hole sweeper to compressed air to clean the holes, so as to ensure that explosives are charged to bottoms;
4, selecting emulsion explosives with the specification of 030 mm x 200 mm x 200 g, making stemming with the diameter of 035 mm and the length of about 200 mm on site, which facilitates placing into the blastholes; charging the explosives by using a positive continuous charging structure, where the charge decoupling coefficient K = 45/30 = 1.5; filling the remaining blasthole length with the stemming; connecting non-electric millisecond delay detonators and detonating cords with the length of 7.0 m firmly to ensure good electrification, where attention should be paid to protection in subsequent work; 5. in order to avoid detonation interruption, charging one detonator with the same segment number (segment 1) in the 5th section of explosives in cut holes charged with much explosive; o in rectangular auxiliary holes, charging one detonator with the same segment number (segment 3) is additionally in the 4th section of explosives of every other three holes, which ensures that all explosives are detonated; 6. covering the blasting body with two steel plates with corresponding area and with the thickness of 6 mm, connecting the steel plates in an overlapped manner by using 4 bolts, pressing the steel plates with 2 to 4 pieces of waste section steel, pressing the waste section steel with about 0.5 m thick sandy soil (with stones removed to avoid flying stones), placing one layer of steel plate, then covering the steel plate with 0.5 m thick sandy soil, and finally, filling the gaps in the blastholes and the gaps below and above the steel plates with water, where in a process of setting up protection, the connecting wires of the detonators are protected, and the pin !o wires and the connecting wires must not be broken; 7, arranging, as high as possible, sandy soil piles to surround and protect one side, close to high-tension cables, existing lines, residential areas, and workshops, of a bridge pier, or arranging color steel plates or the like to surround and protect, especially the sections close to the high-tension cables and the existing lines;
Detonation Sequence
Detonator Segment Number
Clay Filling
Charge amount (kg)AA
Resistance (mm)
' Hole distance C (mm) 00 0 O
Hole Depth (m)C
Inclination Angle c (0)
00 cl
Hole Quantity (Holes) \OC lcl
Name dC d d ;:I ;: ;:I;:
Hole Number 00 Cl
Cl ? 0 \ OC I 0 III I T t~- -FC
8. setting the warning distance to be greater than 200 m, arranging a blasting warning at each intersection, evacuating equipment, staff, animals, and the like out of a safety distance, and ensuring that all operators wear helmets; 9, implementing a system of chain shooting by a blaster, a monitor and a safety officer, where the safety officer is responsible for blasting warning, the monitor is responsible for commanding, and the blaster blows a warning whistle after the monitor gives a blasting order and then starts detonating after making sure that the surrounding area is safe; checking and eliminating danger 15 minutes after detonating, and relieving the warning after confirming that 1 there is no danger.
Note
Cd
Quantity 00 0C
Unit
Project Name 0- 0 0 -Cd ~n d -=1 -d
N - d>~ ,.DQ0 LC
Sequence Ml~' ~\ 00 number -
Note -e
Quantity Cl - I Cl00
Z Cd -Qd
Project Nam C0 0 C
Cd Cd -d
SequenceH MW) 0 r-0 l number
Claims (5)
1. A pier deep foundation pit blasting method for controlling flying stone by water coupling soil pressing, wherein the method is performed according to the following steps:
Si, cleaning up floating slag, movable stones, and accumulated water on a working face before drilling holes;
S2, perpendicularly drilling holes in designated positions, wherein the bottoms of blastholes are essentially on the same horizontal plane;
S3, clearing the holes after hole drilling is completed; S4, making stemming, selecting 1o emulsion explosives with the specification of 030 mm x 200 mm x 200 g for charging, and connecting non-electric millisecond delay detonators and detonating cords firmly, wherein attention is paid to protection in subsequent work;
S5, covering a blasting body with steel plates and sandy soil, and filling the gaps in the blastholes and the gaps below and above the steel plates with water;
S6, arranging sandy soil piles to surround and protect one side, close to high-tension cables, existing lines, residential areas, and workshops, of a bridge pier, including the sections close to the high-tension cables and the existing lines;
S7, arranging a blasting warning at each intersection, evacuating equipment, staff, animals, and the like out of a safety distance of 200 meters, and ensure all operators wear helmets; !o S8, after a monitor gives a blasting command, blowing, by a blaster, a warning whistle to confirm that a surrounding area is safe and then starting to detonate; checking and eliminating danger 15 minutes after detonating, and rcancelling the warning after confirming that there is no danger.
2. The pier deep foundation pit blasting method for controlling flying stone by water coupling soil pressing according to claim 1, wherein the holes are drilled by using 018 mm x (1.8 to 4.5 m) hollow hexagonal steel drill pipes with unequal lengths, a 042 mm straight alloy steel drill bit, and a pneumatic drill without an air leg.
3. The pier deep foundation pit blasting method for controlling flying stone by water coupling soil pressing according to claim 1, wherein the stemming with the diameter of 035 mm and the length of about 200 mm is made on site, which facilitates placing into the blastholes; the explosives are charged by using a positive continuous charging structure; the charge decoupling coefficient K = 45/30 = 1.5; the remaining blasthole length is filled by using the stemming; non-electric millisecond delay detonators and detonating cords with a length of 7.0 m are used.
4. The pier deep foundation pit blasting method for controlling flying stone by water coupling soil pressing according to claim 1, wherein in order to avoid detonation interruption, one detonator with the same segment number, namely, segment 1, is charged into the 5th section of explosives in cut holes charged with explosive; in rectangular auxiliary holes, one detonator with the same segment number, namely, segment 3, is additionally charged into the 4th section of explosives of every other three holes, which ensures that all explosives are detonated.
5. The pier deep foundation pit blasting method capable of controlling flying stone by water coupling soil pressing according to claim 1, wherein the blasting body is covered with two steel 1o plates with corresponding area and with the thickness of 6 mm; the steel plates are connected in an overlapped manner by using 4 bolts; 2 to 4 pieces of waste section steel are pressed on the steel plates, then about 0.5 m thick sandy soil is pressed on the waste section steel, one layer of steel plate is placed, and the steel plate is covered with 0.5 m thick sandy soil; finally, the gaps in the blastholes and the gaps below and above the steel plates are filled with water; detonator 1s connecting wires are protected in a process of setting up protection, and pin wires and the connecting wires are not broken.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021101475A AU2021101475A4 (en) | 2021-03-23 | 2021-03-23 | Pier deep foundation pit blasting method capable of controlling flying stone by water coupling soil pressing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021101475A AU2021101475A4 (en) | 2021-03-23 | 2021-03-23 | Pier deep foundation pit blasting method capable of controlling flying stone by water coupling soil pressing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021101475A4 true AU2021101475A4 (en) | 2021-05-13 |
Family
ID=75829146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021101475A Ceased AU2021101475A4 (en) | 2021-03-23 | 2021-03-23 | Pier deep foundation pit blasting method capable of controlling flying stone by water coupling soil pressing |
Country Status (1)
| Country | Link |
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| AU (1) | AU2021101475A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114577082A (en) * | 2022-02-28 | 2022-06-03 | 浙江公铁建设工程有限公司 | Safe covering system and covering method for buffering blasting impact of foundation pit |
-
2021
- 2021-03-23 AU AU2021101475A patent/AU2021101475A4/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114577082A (en) * | 2022-02-28 | 2022-06-03 | 浙江公铁建设工程有限公司 | Safe covering system and covering method for buffering blasting impact of foundation pit |
| CN114577082B (en) * | 2022-02-28 | 2023-09-29 | 浙江公铁建设工程有限公司 | Safety covering system and method for buffering blasting impact of foundation pit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |