A dynamic compaction device and a dynamic compaction method for reinforcing liquefied ground

Abstract

The application relates to a dynamic compaction device and a dynamic compaction reinforcement method for a strong vibration liquefied foundation, and belongs to the field of highway construction. The dynamic compaction device comprises a dynamic compaction machine body and a rammer, further comprises a hole blocking mechanism arranged on the rammer, the hole blocking mechanism comprises a hole blocking pipe and a bag arranged on the side wall of the hole blocking pipe, the hole blocking pipe is connected with the side wall of a ventilation hole of the rammer, and an adjusting assembly for adjusting and controlling the inflation of the bag is arranged on the rammer. The hole blocking mechanism is arranged, so that the soil and other impurities remaining in the ventilation hole are discharged from the ventilation hole in time after the rammer leaves the ground, so that the ventilation hole of the rammer is not prone to storing soil, and the purpose of improving the dynamic compaction reinforcement construction efficiency is achieved. The application further provides a dynamic compaction reinforcement method for a strong vibration liquefied foundation, and the method has the advantages of high construction efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of highway construction, in particular to a strong ramming device and a strong vibration liquefied foundation ramming reinforcement method. BACKGROUND

[0002] The highway foundation treatment is an important construction step in highway construction, which is related to the strength and stability of the roadbed. Foundation soil liquefaction is a special engineering geological phenomenon, specifically, the pore water pressure of saturated liquefiable foundation soil rises suddenly within a short period of time under the earthquake, and the effective stress is reduced to zero, the soil shows a nearly liquid state, and the strength is completely lost. Its macroscopic phenomenon is surface cracking, sand blasting, water spouting, which causes landslides and foundation failure, and causes the upper building to sink, float, tilt and crack.

[0003] At present, the treatment principle for liquefied foundation is to improve the soil compaction and improve the condition of excluding pore water, thereby improving its anti-liquefaction capacity. The commonly used method is the strong ramming reinforcement method.

[0004] The strong ramming method is a foundation reinforcement method invented by the French Menard Company. This method uses a 10-40t rammer to impact and vibrate the foundation soil with a drop distance of 10-40m, thereby improving the strength of the soil and reducing its compressibility.

[0005] However, in the process of the strong ramming device hammering the ground, the air hole of the rammer will accumulate mud, so that the workers need to clean it after a few times of ramming, thereby reducing the efficiency of the strong ramming reinforcement construction. SUMMARY

[0006] In order to make the air hole of the rammer not easy to accumulate mud, thereby achieving the purpose of improving the efficiency of the strong ramming reinforcement construction, the present application provides a strong ramming device and a strong vibration liquefied foundation ramming reinforcement method.

[0007] In the first aspect, the present application provides a strong ramming device, which relates to the following technical scheme:

[0008] A strong ramming device, comprising a strong ramming machine body and a rammer, further comprising a hole plugging mechanism arranged on the rammer, the hole plugging mechanism comprising a hole plugging pipe and a bag arranged on the side wall of the hole plugging pipe, the hole plugging pipe is connected with the side wall of the air hole of the rammer, and the rammer is provided with a control assembly for controlling the inflation of the bag.

[0009] By adopting the technical scheme, when the rammer compacts the ground, the rammer first contacts the soil, at this time, the soil is loose, and the air in the soil is more, when the rammer contacts the soil, the air in the soil runs out from the air vent of the rammer, and the soil is more likely to collapse from the air vent and not to stay in the air vent, when the rammer continues to move towards the ground, the soil becomes compact, at this time, the control assembly is controlled to make the bag swell, so as to reduce the diameter of the air vent, in this process, because the compactness of the soil itself is improved, the soil is easy to stay in the air vent and cause the air vent to be blocked, when the rammer driven by the ramming device leaves the ground, the control assembly is controlled to make the bag shrink, that is, the diameter of the air vent for the soil to pass through is increased, and the soil staying in the air vent falls out, so that the air vent of the rammer is not easy to store soil, and the purpose of improving the efficiency of the ramming reinforcement construction is achieved.

[0010] Optionally, the control assembly comprises a control piston and a control box, the control box is connected with the rammer, the control piston is in sealed sliding connection with the control box, and the control piston is arranged towards the ground and extends beyond the side of the rammer close to the ground, and the control box is in communication with the bag.

[0011] By adopting the technical scheme, when the rammer falls, the control piston is in contact with the ground first, so that the control piston is relatively displaced with the control box under the action of the ground, that is, the control piston moves towards the bottom of the control box relative to the control box, the pressure in the control box rises, and the gas in the control box flows into the bag, so that the bag swells; when the rammer leaves the ground, the control piston is relatively displaced with the control box under the action of its own gravity, that is, the control piston moves away from the bottom of the control box relative to the control box, the pressure in the control box decreases, and the gas in the bag is absorbed, so that the bag shrinks.

[0012] Optionally, the plugging pipe is fixedly connected with the control piston, and the plugging pipe can move along the side wall of the air vent.

[0013] By adopting the technical scheme, the plugging pipe can move along the side wall of the air vent, so that the control piston is more likely to move away from the bottom of the control box relative to the control box under the action of gravity.

[0014] Optionally, the communication position of the bag and the control box is located on the side of the bag close to the ground.

[0015] By adopting the technical scheme, the communication position of the bag and the control box is arranged to make the bag swell from the side close to the ground first, so that the soil entering the plugging pipe is not easy to be too much.

[0016] Optionally, a dust blocking piece is fixedly connected on the plugging pipe, one end of the dust blocking piece is connected with the control piston, and the other end of the dust blocking piece is connected with the rammer.

[0017] By adopting the technical scheme, the dust blocking member is arranged to prevent dust from being attached to the control piston, thereby improving the working stability of the control piston.

[0018] Optionally, the tamper hammer is provided with a buffer spring, one end of the buffer spring being connected with the piston and the other end being connected with the tamper hammer.

[0019] By adopting the technical scheme, when the tamper hammer is lifted, the buffer spring promotes the control piston to move away from the bottom of the control box.

[0020] Optionally, the end surface of the hole blocking pipe away from the ground is arranged to be inclined, and the inclined direction is inclined downward along the direction close to the axis of the hole blocking pipe.

[0021] By adopting the technical scheme, the end surface of the hole blocking pipe arranged to be inclined downward prevents the soil and other impurities from being stored between the hole blocking pipe and the side wall of the air hole.

[0022] In a second aspect, the application provides a strong vibration liquefied foundation strong ramming reinforcement method, which relates to the following technical scheme.

[0023] A strong vibration liquefied foundation strong ramming reinforcement method using the strong ramming device includes the following steps,

[0024] S1, clearing the site;

[0025] S2, arranging the ramming points;

[0026] S3, arranging the strong ramming device and performing ramming;

[0027] S4, full-ramming construction.

[0028] By adopting the technical scheme, the process of the application has the advantage of high construction efficiency.

[0029] In summary, the application has at least one of the following beneficial technical effects:

[0030] 1. The hole blocking mechanism is arranged to timely discharge the soil and other impurities stored in the air hole after the tamper hammer leaves the ground, so that the air hole of the tamper hammer is not easy to store soil, thereby achieving the purpose of improving the strong ramming reinforcement construction efficiency;

[0031] 2. The dust blocking member is arranged to prevent dust from being attached to the control piston, thereby improving the working stability of the control piston;

[0032] 3. The process of the application has the advantage of high construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1is a schematic view of the overall structure of the strong ramming device in the embodiment of the present application;

[0034] Figure 2 is a partial sectional view of the rammer in the embodiment of the present application;

[0035] Figure 3 is a partial sectional view of the hole plugging mechanism in the embodiment of the present application.

[0036] Legend: 100, strong ramming machine body; 200, rammer; 210, air hole; 220, accommodating groove; 230, accommodation groove; 300, hole plugging mechanism; 310, hole plugging pipe; 311, connecting ring; 312, groove; 320, bag; 400, regulating assembly; 410, regulating piston; 420, regulating box; 430, communication pipe; 500, buffer spring; 600, dust blocking piece. DETAILED DESCRIPTION

[0037] The following will be described in detail with reference to the accompanying drawings Figures 1-3 The present application will be further described in detail.

[0038] The embodiment of the present application discloses a strong ramming device. Referring to Figure 1 , the strong ramming device comprises a strong ramming machine body 100 and a rammer 200. The rammer 200 is connected with the strong ramming machine body 100.

[0039] Referring to Figure 2 , in order to prevent the air cushion effect from occurring between the rammer 200 and the ground during the process of the rammer 200 ramming the ground, thereby affecting the effect of the rammer 200 ramming the ground, a plurality of air holes 210 are formed on the rammer 200.

[0040] Referring to Figure 2 and Figure 3 , the air holes 210 are not easy to be blocked when the rammer 200 strikes the ground, thereby affecting the ramming efficiency of the ground, so the strong ramming device further comprises a hole plugging mechanism 300 connected with the side wall of the air hole 210 of the rammer 200.

[0041] The hole plugging mechanism 300 comprises a hole plugging pipe 310 and a bag 320 connected with the inner wall of the hole plugging pipe 310, the hole plugging pipe 310 is located in the air hole 210 and abuts against the side wall of the air hole 210, and the hole plugging pipe 310 can move axially along the air hole 210. In order to prevent impurities such as soil from being stored between the side wall of the air hole 210 and the hole plugging pipe 310, and to facilitate the movement of the hole plugging pipe 310 along the side wall of the air hole 210, the end surface of the hole plugging pipe 310 away from the ground is provided as an inclined surface, and the inclined surface is inclined downward in the direction close to the axis of the hole plugging pipe 310. The bag 320 is fixedly connected with the side wall of the hole plugging pipe 310, and the rammer 200 is provided with a regulating assembly 400 for adjusting the bulging of the bag 320.

[0042] The regulating assembly 400 comprises a regulating piston 410 in a ring shape and a regulating box 420, and the tamper 200 is provided with a containing groove 220 for accommodating the regulating box 420 at a side close to the ground, the regulating box 420 is located in the containing groove 220 and is detachably connected with the tamper 200 by bolts. The regulating piston 410 is located at a side of the regulating box 420 close to the ground and is sealingly and slidably connected with the regulating box 420, and the regulating piston 410 is fixedly connected with the hole-plugging pipe 310. The regulating box 420 is communicated with the bag 320 through a communication pipe 430, and the hole-plugging pipe 310 is provided with a groove 312 for accommodating the communication pipe 430 on a side wall, so that the surface of the bag 320 is not easy to be wrinkled.

[0043] When the tamper 200 is lifted by the strong rammer body 100, the regulating piston 410 and the hole-plugging pipe 310 move towards the ground under the action of their own gravity, at this time, the pressure in the regulating box 420 decreases, and the bag 320 shrinks. When the tamper 200 starts to hammer the ground, the regulating piston 410 and the hole-plugging pipe 310 preferentially contact the ground, at this time, the soil of the ground is relatively loose, and the air in the soil is relatively more, so that the regulating piston 410 and the hole-plugging pipe 310 maintain the state that the bag 320 is retracted under the action of their own gravity, and the size of the hole-plugging pipe 310 that can accommodate the soil is relatively large, at this time, the soil mainly falls out of the hole-plugging pipe 310 in a loose state. When the tamper 200 continues to fall, the ground gradually becomes compacted, at this time, the regulating piston 410 and the hole-plugging pipe 310 continue to hammer the ground, and the regulating piston 410 and the hole-plugging pipe 310 move towards the bottom of the regulating box 420 relative to the regulating box 420 under the action of the ground, so that the pressure in the regulating box 420 increases, the bag 320 is inflated, and the size of the hole-plugging pipe 310 that can accommodate the soil becomes smaller. When the tamper 200 is lifted again, the soil retained in the hole-plugging pipe 310 makes the hole-plugging pipe 310 and the regulating piston 410 more easily move towards the ground, and at the same time, with the movement of the hole-plugging pipe 310 and the regulating piston 410, the pressure in the regulating box 420 decreases, the bag 320 shrinks, and the space in the hole-plugging pipe 310 becomes larger, so that the soil retained in the hole-plugging pipe 310 falls out of the hole-plugging pipe 310 under the action of its own gravity.

[0044] In order to prevent the hole-plugging pipe 310 from being directly blocked due to too much soil entering the hole-plugging pipe 310 during the inflation of the bag 320, the communication position of the bag 320 and the communication pipe 430 is located at a side of the bag 320 close to the ground.

[0045] In order to make the tamper 200 in the initial state, the hole plug pipe 310 and the control piston 410 are in the state of the bag 320 being retracted, therefore a plurality of buffer springs 500 are arranged on the tamper 200, the plurality of buffer springs 500 are uniformly arranged along the circumference of the hole plug pipe 310, and one end of the buffer spring 500 is fixedly connected with the tamper 200, and the other end is connected with the control piston 410. In order to make the buffer spring 500 not easy to be corroded by impurities in the soil, therefore the control piston 410 is arranged in a spaced manner with the hole plug pipe 310, and the two are connected through the connecting ring 311, that is, one side of the connecting ring 311 is fixedly connected with the hole plug pipe 310, and the other side is fixedly connected with the control piston 410. The buffer spring 500 is located in the space enclosed by the hole plug pipe 310, the connecting ring 311, the tamper 200 and the control piston 410, and the end of the buffer spring 500 away from the tamper 200 abuts against the connecting ring 311.

[0046] In order to make the connecting ring 311 not easy to interfere with the abutment of the tamper 200 and the ground, therefore the tamper 200 is provided with a relief groove 230 for the connecting ring 311 to be clamped into, and the relief groove 230 is in communication with the accommodating groove 220.

[0047] In order to make the control piston 410 not easy to bond with impurities such as soil, so as to improve the working stability of the control piston 410, therefore the connecting ring 311 is fixedly connected with a dust blocking piece 600, in the embodiment, the dust blocking piece 600 is a dust blocking rubber pad, the dust blocking rubber pad is arranged in a ring shape, and one end of the dust blocking rubber pad is fixedly connected with the connecting ring 311, and the other end is fixedly connected with the side wall of the relief groove 230.

[0048] The end of the dust blocking rubber pad close to the groove bottom of the relief groove 230 is located in the relief groove 230, so that when the connecting ring 311 enters the relief groove 230, the connecting ring 311 drives the dust blocking rubber pad to move into the relief groove 230, so as to on the one hand make the dust blocking rubber pad plug the relief groove 230, so that impurities such as soil are not easy to enter the relief groove 230, and on the other hand make the dust blocking rubber pad retract without affecting the tamper 200 to hammer the ground.

[0049] Based on the above strong ramming device, the application further provides a strong vibration liquefied foundation strong ramming reinforcement method using the above strong ramming device.

[0050] The strong vibration liquefied foundation strong ramming reinforcement method comprises the following steps:

[0051] S1, cleaning the site;

[0052] S2, arrangement of ramming points: the ramming point layout is marked by lime to indicate the first pass position;

[0053] S3, the strong ramming device is in place, and ramming is carried out: after the strong ramming device is in place, the rammer is lifted to a predetermined height according to the design, and is dropped after unhooking, and each point is rammed to the designed number of hammers. Move to the next point for ramming until the first pass of ramming is completed; after the first pass of ramming is completed, stand still until the pore water pressure disappears, push the ramming pit flat, and repeat the above steps for ramming again;

[0054] S4, full ramming construction;

[0055] S5, leveling the site;

[0056] S6, measuring the ground elevation and site liquefaction index, and completing the construction.

[0057] The implementation principle of the embodiment of the application is that the strong ramming device lifts the rammer 200 to a certain height, and controls the unhooking device to make the rammer 200 fall.

[0058] When the rammer 200 is lifted by the strong ramming machine body 100, the control piston 410 and the plug pipe 310 move in the direction close to the ground under the action of their own gravity, at this time the pressure in the control box 420 decreases, and the bladder bag 320 contracts. When the rammer 200 starts to hammer the ground, the control piston 410 and the plug pipe 310 preferentially contact the ground, at this time the soil of the ground is relatively loose, and the soil mainly falls out of the plug pipe 310 in a loose state; when the rammer 200 continues to fall, the ground gradually becomes compact, at this time the control piston 410 and the plug pipe 310 continue to hammer the ground, and the control piston 410 and the plug pipe 310 move in the direction close to the bottom of the control box 420 relative to the control box 420 under the action of the ground, so that the pressure in the control box 420 increases, the bladder bag 320 swells, and the size of the plug pipe 310 through which the soil can pass becomes smaller, and part of the soil will be retained in the plug pipe 310, so that the plug pipe 310 is blocked. When the rammer 200 is lifted again, the plug pipe 310 and the control piston 410 move in the direction close to the ground, and at the same time, with the movement of the plug pipe 310 and the control piston 410, the pressure in the control box 420 decreases, the bladder bag 320 contracts, and the space in the plug pipe 310 becomes larger, so that the soil retained in the plug pipe 310 falls out of the plug pipe 310 under the action of its own gravity, so that the air vent 210 is not easily blocked.

[0059] The above are preferred embodiments of the application, which do not limit the protection scope of the application, therefore: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A dynamic compaction apparatus comprising a dynamic compactor body (100) and a rammer (200), characterized in that: Also include the tamper (200) on the hole plugging mechanism (300) is arranged, the hole plugging mechanism (300) includes hole plugging pipe (310) and the bag (320) arranged on the side wall of hole plugging pipe (310), the hole plugging pipe (310) is connected with the side wall of the air hole (210) of tamper (200), the tamper (200) is provided with the control assembly (400) for regulating the bag (320) and is arranged to swell; The control assembly (400) includes control piston (410) and control box (420), the control box (420) is connected with tamper (200), the control piston (410) is sealed and slidingly connected with control box (420), and the control piston (410) is arranged towards the ground and extends beyond the side of tamper (200) close to the ground, the control box (420) is communicated with the bag (320).

2. The dynamic compactor of claim 1, wherein: The hole plugging pipe (310) is fixedly connected with the control piston (410), and the hole plugging pipe (310) can move along the side wall of the air hole (210).

3. The dynamic compactor of claim 1, wherein: The communication position of the bag (320) and the control box (420) is located on the side of the bag (320) close to the ground.

4. The dynamic compactor of claim 1, wherein: The hole plugging pipe (310) is fixedly connected with the dust stopper (600), one end of the dust stopper (600) is connected with the control piston (410), and the other end is connected with the tamper (200).

5. The dynamic compactor of claim 2, wherein: The tamper (200) is provided with a buffer spring (500), one end of the buffer spring (500) is connected with the hole plugging pipe (310), and the other end is connected with the tamper (200).

6. The dynamic compactor of claim 1, wherein: The end surface of the hole plugging pipe (310) away from the ground is inclinedly arranged, and the inclination direction is inclined downward along the direction close to the axis of the hole plugging pipe (310).

7. A method for dynamic consolidation of liquefiable ground using the dynamic consolidation apparatus according to any one of claims 1 to 6, characterized in that: The method comprises the following steps, S1, clean up the site; S2, tamper point arrangement; S3, strong ramming device is in position, and is carried out ramming; S4, full tampering construction.

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