CN114673134B - Solid-gas coupling one-rammer multi-rammer device - Google Patents
Solid-gas coupling one-rammer multi-rammer device Download PDFInfo
- Publication number
- CN114673134B CN114673134B CN202210540932.XA CN202210540932A CN114673134B CN 114673134 B CN114673134 B CN 114673134B CN 202210540932 A CN202210540932 A CN 202210540932A CN 114673134 B CN114673134 B CN 114673134B
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- Prior art keywords
- rammer
- fixed
- ramming
- supporting cylinder
- air
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
Abstract
A kind of solid-gas coupling one rams the multi-rammer device, the fixed rammer of the lower end of the supporting cylinder of this device is used for ramming the soil mass of the roadbed for the first time, then slide the rammer to slide and strike the fixed rammer and carry on the secondary rammer, because the falling speed of the rammer is very fast, but the interval between slide and the fixed rammer is limited, so the interval time of the two rammers is very short, can achieve the effect of one rammer and two rammers, one rammer and two rammers make the rammer device ram the time of the soil mass lengthen, will receive the rammer function of the rammer device again when the reflected vibration wave of one rammer returns to the roadbed surface, reflect the vibration wave continuously, can discharge the water in the soil rapidly, and improve the stress depth of the soil mass of the roadbed greatly; the air blocking ring arranged on the lower end face of the fixed rammer is used for forming an air cushion during ramming, the buffer effect of the air cushion can effectively reduce the ramming speed and the ramming frequency, so that the ramming energy distribution is more uniform, and the problem of difficult ramming of a high-liquid limit soil roadbed can be effectively solved.
Description
Technical Field
The invention relates to the technical field of soft foundation treatment in civil engineering, in particular to a solid-gas coupling one-ramming-multiple-ramming rammer device.
Background
The high liquid limit soil is the soil with the particle content of less than 0.075mm being more than 50%, the liquid limit being more than 50% and the plasticity index being more than 26. The main characteristics of the high liquid limit soil are poor compactibility, the compactibility of the compacted soil is still larger, and the compacted soil has obvious strain softening. The roadbed surface layer bears the largest driving acting force, the stress is reduced sharply from the top downwards, the influence depth is in the range of 1.0-2.0 m under the action of the load of a general automobile, and the influence depth can reach 2.9m for a heavier automobile, so that the key of the roadbed quality is how to tamp the roadbed to meet the strength requirement for filling high liquid limit soil. Vibration caused in the roadbed ramming process is transmitted to the underground in the form of vibration waves in the soil, most of compression waves (longitudinal waves) in the vibration waves move through liquid phase, pore water pressure is gradually increased, a soil body framework is disintegrated, and then shear waves (transverse waves) are reached to enable disintegrated soil body particles to be in a more compact state.
Disclosure of Invention
In order to solve the problems, the invention provides a solid-gas coupling one-ramming-multiple-ramming-rammer device.
The technical scheme of the invention is as follows: a solid-gas coupling one-ramming-multiple-ramming rammer device comprises a round supporting cylinder body, a cylindrical fixed rammer and a cylindrical sliding rammer; the fixed rammer is fixedly sleeved on the lower part of the supporting cylinder, the bottom surface of the fixed rammer is flush with the bottom surface of the supporting cylinder, the sliding rammer is slidably sleeved on the upper part of the supporting cylinder, lifting lugs are arranged in the middle of the upper surface of the sliding rammer, and a plurality of limit baffles extending into the port of the supporting cylinder are uniformly distributed on the upper end surface of the supporting cylinder along the circumferential direction.
Preferably, the bottom surface of the fixed rammer is coaxially provided with an air blocking ring, and the outer diameter of the air blocking ring is the same as the diameter of the fixed rammer.
Preferably, the inner side surface of the air blocking ring is a conical surface, and the inner part of the air blocking ring is formed into a downward-opening horn shape.
Preferably, a plurality of air channels which are vertically communicated are uniformly distributed in the fixed rammer, and the air channels are arranged along the radial direction.
Preferably, the air channel comprises a circular channel in the lower half and a circular channel in the upper half, and the small-sized end of the circular channel is connected with the circular channel.
Preferably, a sand blocking net is arranged in the middle of the air channel in the fixed rammer.
Preferably, the height of the supporting cylinder is set to 1.5m, the diameter of the fixed rammer is set to 1.3m, the height is set to 0.5m, the diameter of the sliding rammer is set to 1.3m, and the height is set to 0.5m.
The beneficial technical effects of the invention are as follows:
(1) The fixed rammer at the lower end of the supporting cylinder body is used for first ramming the soil body of the roadbed, then the sliding rammer slides downwards to strike the fixed rammer to perform secondary ramming, the falling speed of the rammer is very fast, but the interval between the fixed rammer and the sliding rammer is limited, so that the interval time between the two rammers is very short, the effect of one rammer and two rammers can be achieved, the time of one rammer and the two rammers can prolong the time of the rammer to tamp the soil body, when the reflected vibration wave of one rammer returns to the surface of the roadbed, the impact energy of the rammer can be again acted, the vibration wave is continuously reflected, the water in the soil can be rapidly discharged, and the stress depth of the soil body of the roadbed can be greatly improved.
(2) The air blocking ring arranged on the bottom surface of the fixed rammer can form a closed space with the soil body of the roadbed during ramming, the closed space can effectively prevent air between the bottom surface of the fixed rammer and the soil body from diffusing outwards, and an air cushion is formed at the lower end of the fixed rammer; the air channel that sets up in the fixed ram is used for will supporting the inside cavity of barrel and the airtight space intercommunication in the air barrier ring, and the interior air of compression cavity is slided downwards to the in-process of ramming, makes it enter into the air barrier ring from the air channel, can form the air cushion again in fixed ram lower extreme, and the cushioning effect of air cushion can effectively reduce ramming speed and ramming frequency, is favorable to the transmission of ramming energy, makes the energy distribution of ramming more even, and the ramming effect is better, can effectively solve the problem of the difficult ramming of high-liquid limit soil roadbed.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;
FIG. 4 is a B-B cross-sectional view of FIG. 3;
FIG. 5 is a schematic view of the bottom construction of the present invention;
fig. 6 is a schematic perspective view of a fixed ram of the present invention.
In the figure, 11, a supporting cylinder, 111, a limit baffle, 12, a fixed rammer, 13, a sliding rammer, 131, lifting lugs, 14, an air blocking ring, 141, a conical surface, 15, an air passage, 151, a circular passage, 152, a circular truncated cone-shaped passage and 16, a sand blocking net.
Detailed Description
1-6 of the accompanying drawings, a solid-gas coupling one-ramming-multiple-ramming device comprises a round supporting cylinder body, a cylindrical fixed rammer and a cylindrical sliding rammer; the fixed rammer is fixedly sleeved on the lower portion of the supporting cylinder, the bottom surface of the fixed rammer is flush with the bottom surface of the supporting cylinder, the sliding rammer is slidably sleeved on the upper portion of the supporting cylinder, a certain gap is reserved between the sliding rammer and the supporting cylinder, lifting lugs are arranged in the middle of the upper surface of the sliding rammer and used for hanging lifting ropes, a plurality of limit baffles extending into ports of the supporting cylinder are uniformly distributed on the upper end surface of the supporting cylinder along the circumferential direction, when the rammer device is pulled up through the lifting lugs, the sliding rammer slides upwards in the supporting cylinder firstly, the limit baffles are blocked on the upper end surface of the sliding rammer when the sliding rammer slides to the upper ports of the supporting cylinder, and the sliding rammer stops sliding and continues to pull up the rammer device.
The sliding rammer slides downwards in the supporting cylinder to strike the fixed rammer so as to realize secondary ramming, and in the process, the supporting cylinder can play a role in guiding the sliding of the sliding rammer, so that the stress point of the sliding rammer on the upper surface of the fixed rammer is concentrated, and the striking force of secondary striking can be improved.
An air blocking ring is coaxially arranged on the bottom surface of the fixed rammer, and the outer diameter of the air blocking ring is the same as the diameter of the fixed rammer; the inner side surface of the air blocking ring is a conical surface, the inside of the air blocking ring is formed into a downwards-opened horn mouth shape, the downwards-opened horn mouth can change the stress direction of air entering the air blocking ring, the downward pressure of the air blocking ring on the inside air is enhanced, and the pressure of the generated air cushion is improved.
The fixed rammer is characterized in that a plurality of air channels which are vertically communicated are uniformly distributed in the fixed rammer, the air channels are arranged along the radial direction, each air channel comprises a circular channel at the lower half part and a circular platform-shaped channel at the upper half part, the small-size end of each circular platform-shaped channel is connected with the corresponding circular channel, the circular platform-shaped channels form channels for guiding air on the upper surface of the fixed rammer, and when the sliding rammer slides downwards to compress the air in the supporting cylinder body, the air in the supporting cylinder body can be accelerated to be introduced into the inner space of the air blocking ring, and the pressure of the air cushion is improved. In addition, the structure with the upper part wide and the lower part narrow of the air channel can also play a role in blocking sand from entering the supporting cylinder body.
The middle part of supporting the barrel is fixed with keeps off the sand net, should keep off the bottom surface of sand net and the upper surface laminating of fixed rammer, and the grit in the ramming process road bed can be from air passage bullet entering into supporting the barrel in, keeps off the sand net and can block the grit to enter into supporting the barrel in, avoids the sand stone pad to slide between rammer and the fixed rammer, guarantees the ramming effect of secondary ramming. The sand blocking net can be arranged in the middle of the air channel, so that the sand blocking net can be prevented from being damaged by the ramming of the sliding rammer, and the service life of the sand blocking net is prolonged.
The height of the supporting cylinder body is set to be 1.5m, the diameter of the fixed rammer is set to be 1.3m, the heights of the fixed rammer and the sliding rammer are set to be 0.5m, the diameter of the sliding rammer is set to be 1.3m, the height of the sliding rammer is set to be 0.5m, and the height of the air blocking ring is set to be 0.1m.
The application process and principle of the invention are as follows:
when the rammer device is used for ramming, a lifting rope of a lifting device is connected into a lifting lug of a sliding rammer, the lifting device starts to upwards pull the rammer device through the lifting rope, the sliding rammer is stressed upwards in a supporting cylinder body, a limit baffle is blocked on the upper end face of the sliding rammer when the sliding rammer slides to the upper end opening of the supporting cylinder body, the sliding rammer stops moving and continues to upwards pull the rammer device, then the lifting device releases the lifting rope, the rammer device falls, a fixed rammer at the lower end of the supporting cylinder body firstly contacts with a roadbed soil body for first ramming, then the sliding rammer downwards slides to impact the fixed rammer for second ramming, and because the falling speed of the rammer device is very fast, the interval between the fixed rammer and the sliding rammer is very short, the effect of one rammer and two rammers is achieved, the time of one rammer and two rammers is prolonged, when the reflected vibration waves of one rammer device returns to the roadbed surface, the vibration waves of the rammer can be subjected to the impact effect of the rammer device again, the water waves can be reflected continuously and the vibration waves can be rapidly discharged and the water soil body can be greatly increased.
Claims (4)
1. A solid-gas coupling one rammer multiple rammer device is characterized in that: comprises a round supporting cylinder body, a cylindrical fixed rammer and a cylindrical sliding rammer; the fixed rammer is fixedly sleeved at the lower part of the supporting cylinder body, the bottom surface of the fixed rammer is level with the bottom surface of the supporting cylinder body, the sliding rammer is slidably sleeved at the upper part of the supporting cylinder body, a lifting lug is arranged in the middle of the upper surface of the sliding rammer, and a plurality of limit baffles extending into the port of the supporting cylinder body are uniformly distributed on the upper end surface of the supporting cylinder body along the circumferential direction;
an air blocking ring is coaxially arranged on the bottom surface of the fixed rammer, and the outer diameter of the air blocking ring is the same as the diameter of the fixed rammer;
the inner side surface of the air blocking ring is a conical surface, and the inner part of the air blocking ring is formed into a downward-opening horn shape;
a plurality of air channels which are vertically communicated are uniformly distributed in the fixed rammer, and the air channels are arranged along the radial direction.
2. The solid-gas coupled one-tamper-multiple-tamper rammer device of claim 1, wherein: the air channel comprises a circular channel at the lower half part and a round platform-shaped channel at the upper half part, and the small-size end of the round platform-shaped channel is connected with the circular channel.
3. The solid-gas coupled one-tamper-multiple-tamper rammer device of claim 1, wherein: the middle part of the air passage in the fixed rammer is provided with a sand blocking net.
4. The solid-gas coupled one-tamper-multiple-tamper rammer device of claim 1, wherein: the height of the supporting cylinder body is set to be 1.5m, the diameter of the fixed rammer is set to be 1.3m, the height of the fixed rammer is set to be 0.5m, the diameter of the sliding rammer is set to be 1.3m, and the height of the sliding rammer is set to be 0.5m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210540932.XA CN114673134B (en) | 2022-05-19 | 2022-05-19 | Solid-gas coupling one-rammer multi-rammer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210540932.XA CN114673134B (en) | 2022-05-19 | 2022-05-19 | Solid-gas coupling one-rammer multi-rammer device |
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| CN114673134A CN114673134A (en) | 2022-06-28 |
| CN114673134B true CN114673134B (en) | 2023-08-22 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960607A (en) * | 2022-07-12 | 2022-08-30 | 中化岩土集团股份有限公司 | Progressive dynamic compaction construction method and construction equipment thereof |
| CN116356647B (en) * | 2023-03-22 | 2023-10-24 | 江阴华信建设工程有限公司 | Rammed earth structure for municipal engineering road pavement |
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