CN108867614B - Construction method for paving road on debris flow soft foundation - Google Patents
Construction method for paving road on debris flow soft foundation Download PDFInfo
- Publication number
- CN108867614B CN108867614B CN201810805207.4A CN201810805207A CN108867614B CN 108867614 B CN108867614 B CN 108867614B CN 201810805207 A CN201810805207 A CN 201810805207A CN 108867614 B CN108867614 B CN 108867614B
- Authority
- CN
- China
- Prior art keywords
- soft foundation
- road
- debris flow
- paving
- cement
- 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.)
- Active
Links
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
The invention relates to the technical field of road construction, in particular to a construction method for paving a road on a debris flow soft foundation; the method sequentially comprises the process steps of drainage, vibration and compaction in the soft foundation, piling in the soft foundation, paving a road base layer and paving a road surface; the vibration system and the pressurization system are adopted to act together and extend into the soft foundation of the debris flow, so that the soft foundation is compacted tightly; the problem that a traditional soft foundation paving process is not suitable for geological requirements of mountainous areas is solved, and the soft foundation is internally compacted in a vibration mode layer by layer according to special conditions of the mountainous areas, so that the interior of a road foundation is tight and not loose, the structural strength and stability of the road foundation are guaranteed, and the method is a construction method specially designed according to geological characteristics of the mountainous areas and aiming at road paving.
Description
Technical Field
The invention relates to the technical field of road construction, in particular to a construction method for paving a road on a debris flow soft foundation.
Background
The debris flow refers to a special flood flow which is caused by landslide caused by rainstorm, snowstorm or other natural disasters and carries a large amount of silt and stones in a mountain area or other gullies and in a severe terrain. The debris flow has the characteristics of high abruptness, high flow rate, high flow, large material capacity, strong destructive power and the like. The traffic facilities such as roads, railways and the like are often destroyed by debris flow, and traffic transportation paralysis is caused. Therefore, road paving needs to be carried out on the debris flow soft foundation to solve the problem of traffic paralysis.
The invention patent with the patent number of 201210403142.3 discloses a construction method for paving a road on a debris flow soft foundation, wherein a subgrade box is placed on the debris flow soft foundation through calculation of debris flow characteristic parameters, the subgrade box is dug and installed by matching with a backhoe excavator, and a temporary road is paved through a plurality of subgrade boxes, so that the temporary road can quickly and safely pass through a silt region; the method solves the problem that how to quickly lay a temporary road to pass through a sludge area in the rescue work so as to timely carry out the rescue work. However, the debris flow occurs in mountainous areas or deep ravines of gullies, and on trails or other mountain road surfaces, the debris flow can damage the roads, causing traffic paralysis. In the prior art, a construction process for paving a road on a soft foundation aims at paving the road on a soft foundation layer with high water content in a silt region or a foundation layer, the primary factor of the consideration is drainage and reinforcement, and the construction process aims at special geological factors in mountain regions and is not included in a road paving scheme. Therefore, how to lay a road suitable for road surface transportation in a mountainous area on a mountain road with a debris flow soft foundation, and when the debris flow is cleared away, a new road is opened up and traffic transportation paralysis is solved, which is a problem to be solved urgently.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a construction method for paving a road on a debris flow soft foundation, which solves the problem that the traditional soft foundation paving process is not suitable for geological requirements of mountainous areas, carries out layer-by-layer vibration compaction on the interior of the soft foundation aiming at special conditions of the mountainous areas, ensures that the interior of a road foundation is tight and not loosened, ensures the structural strength and stability of the road foundation, and is a construction method specially designed according to geological characteristics of the mountainous areas and aiming at road paving.
The purpose of the invention is realized by the following technical scheme:
a construction method for paving a road on a debris flow soft foundation comprises the following steps:
(1) draining: dredging and discharging water in the area to be constructed to a reservoir;
(2) vibrating and compacting the interior of the soft foundation: embedding a vibration system and a pressurization system into the debris flow soft foundation, controlling the vibration frequency of the vibration system and the pressurization intensity of the pressurization system, and tightly compacting the interior of the debris flow soft foundation layer by layer;
(3) piling inside the soft foundation: dismantling the vibration system, driving a cement pile at the position where the vibration system is buried, controlling the pressurization system, and intermittently applying pressure to the interior of the debris flow soft foundation;
(4) paving a road base layer: dismantling the pressurizing system, and paving a base layer on the surface layer of the debris flow soft foundation;
(5) paving a road surface: and rolling the solidified construction area to form a leveling field and then paving the road.
By adopting the technical scheme, more mud water is remained on the site where the debris flow occurs, and in the step (1), water in the area to be constructed is drained to the reservoir through the water suction pump and dried, so that the water content of the construction area is reduced, and the water infiltration in the construction process is prevented from influencing the construction progress and effect; determining the scale of the vibration system and the pressurization system in the step (2); because the geology in the mountainous area is mostly soft soil, if the interior of the foundation is not treated, the road is laid after a plurality of cushion layers are directly rolled and laid on the surface layer of the foundation, the tightness of the interior of the soil body is uneven due to different viscosities, bubbles can exist locally, the difference with the normal road can be avoided in a short period, but the time is long, soil body particles in the interior are loosened, the road surface can locally sink, the phenomenon of collapse and even debris flow of the road surface can be caused when severe weather such as heavy rain or heavy snow is met, the normal use and the service life of the road are seriously influenced, a lot of inconvenience is brought, and the life danger can be caused seriously even; in the step (2), the interior of the debris flow soft foundation is compacted layer by layer through the matching of the vibration system and the pressurization system, so that soil body particles in the soft foundation are compacted tightly, local bubbles are discharged, and the stability of the finished road foundation is ensured by matching the viscosity of soil in a mountain area; after vibration pressurization compaction, piling in the soft foundation through the step (3), and further improving the structural strength and stability of the soft foundation; through the last two steps of operation, paving a base layer on the compacted and piled foundation and repeatedly rolling, and paving a road according to a normal paving process; the road paved by the process has stable foundation, the bearing capacity reaches 150kPa, and the passing of 20T and above load-carrying vehicles is met; the problem of road paralysis is solved, and the aim and the requirement of road operation are met; and the foundation is stable, so that the collapse or secondary debris flow of the road can be effectively prevented, and the service life of the road is prolonged.
Preferably, the vibration system comprises a vibrator, a vibration rod and a vibration head; and (2) embedding the vibrating rod and the vibrating head in the debris flow soft foundation, and keeping the vibrator on the surface of the construction area for control.
Through adopting above-mentioned technical scheme, bury the vibrating head inside the soft basic of mud-rock flow, under the effect of its periodic vibration power, soil texture granule around, the secondary is arranged and is compacted, has avoided the appearance that there is the bubble scheduling problem locally, cooperates the turbocharging system, more is favorable to closely compacting the soil body inside the soft basic of mud-rock flow.
Preferably, the pressurization system comprises a pressurization pump and a pressurization pipe; in the step (2), the booster pipe is buried in the debris flow soft foundation, and the booster pump is remained on the surface of the construction area for control; the vibration system and the pressurization system are arranged adjacently and uniformly at intervals; the depth of the vibration system and the depth of the pressurization system extending into the soft foundation of the debris flow are the same.
By adopting the technical scheme, the booster pump is buried in the debris flow soft foundation to provide internal pressure for the soft foundation; the depth of the vibration system (mainly referred to as a vibration head) and the depth of the pressurization system (mainly referred to as a pressurization pipe) extending into the debris flow soft foundation are consistent, so that the extrusion force and the vibration source are kept transversely consistent, the vibration head provides vibration and shake for the soft foundation, and the effect of expanding the pressurization direction on the pressurization pipe is achieved; the pressurizing pipe is in a micro-shaking state under the action of the vibrating head, so that the inflating and pressurizing direction is not kept at a fixed and unchangeable position, thereby being more beneficial to the arrangement and compaction of soil particles in a soft foundation and the elimination of local bubbles, and greatly enhancing the compact compaction effect; vibration system (mainly refer to the vibrating arm) and turbocharging system (mainly refer to the pressure boost pipe) are adjacent and evenly alternate setting, and every three vibrating arm space encloses into the triangular prism, encloses into another triangular prism on every three pressure boost pipe space of interphase, and the mirror image sets up and alternately between two triangular prisms, makes soft base inside at the in-process of vibration pressure boost, and the vibration is evenly alternately gone on with the pressure boost, avoids appearing that local pressure is too big and causes the condition such as local collapse.
Preferably, in the step (2), the pressurization system and the vibration system are controlled, and the burying heights of the pressurization pipe and the vibration system are lifted at intervals from bottom to top according to the lifting speed of 0.5 m/time; and carrying out one-time height lifting every 3-5h of pressurization vibration.
By adopting the technical scheme, the height of the pressure increasing pipe is increased, and meanwhile, the vibrating rod of the vibrating system is increased, so that the height of the vibrating rod and the height of the pressure increasing pipe are kept consistent all the time; and pressurizing and vibrating once every 0.5m soft foundation layer for 3-5h each time to ensure that soil particles in the soft foundation are compressed in the largest range and are carried out layer by layer, thereby ensuring the compacting and exhausting effects.
Preferably, in the step (3), a cement pile is driven into the position where the vibrating rod is embedded, and the upper end of the cement pile extends out of the surface layer of the debris flow soft foundation; closing the booster pump within the initial setting time of the cement pile; and starting a booster pump within the final setting time of the cement pile, and intermittently pressurizing for 10 times according to the frequency of 3 hours of air inflation and pressurization for each time to reinforce the cement pile.
By adopting the technical scheme, the driving of the cement piles strengthens the structural strength inside the soft foundation, plays a role in supporting the soft foundation and realizes the secondary consolidation of the soft foundation; the position of the cement pile just replaces the position of the original vibrating rod, so that every three adjacent cement piles form a triangular prism in a surrounding manner in space; the special structure enables the structure in the soft foundation to be more stable, and avoids the situation that the safety and the effect of construction are influenced due to the problems of local collapse and the like; the cement piles extend out of the surface layer of the soft foundation of the debris flow and are used for being crossed and reinforced with the transverse cement plate; in the initial setting time of the cement pile, the booster pump is closed, so that the cement pile is not influenced by external force and is favorable for solidification and forming; in the final setting time, the cement pile structure strength is promoted by intermittently applying pressure; and further strengthen the degree of compaction of the soil particles inside the soft foundation.
Preferably, after the cement piles are initially solidified, the top ends of the adjacent cement piles are reinforced and connected by using transverse cement plates to form the cement net consisting of triangular grid units.
By adopting the technical scheme, the cement mesh enclosure is arranged above the foundation to play a role in supporting and protecting; and triangular meshes are enclosed between the transverse cement plates, so that the structural stability of high strength is realized.
Preferably, after the cement net is aired to be hardened and shaped, spraying a cement curing agent on the surface layer of the cement net; and filling the gravel layer into the meshes of the cement net, and keeping the gravel layer and the upper end surface of the cement net to be flush.
By adopting the technical scheme, the surface layer of the cement net is sprayed with the cement curing agent, so that the service life of the cement net is prolonged; pack the gravel layer and with the online terminal surface parallel and level of cement net in the cement net to form the cement foundation of framework, the cement net provides spatial grid structure for the gravel layer, and the gravel layer is filled and is not filled floating with cement, when guaranteeing structural strength, has reduced construction cost.
Preferably, the gravel layer and the upper layer of the cement net are coated with an anti-cracking reinforcing net, and the size of a net opening of the anti-cracking reinforcing net is smaller than that of gravel in the gravel layer.
Through adopting above-mentioned technical scheme, the crack control reinforcing mat further plays the spacing effect of protection to its inside ground base layer, guarantees that ground base layer's structure is closely knit, improves structural stability.
Preferably, the first cushion layer and the second cushion layer are sequentially paved on the anti-cracking reinforcing net surface layer.
Preferably, the first cushion layer is one or more of bamboo strips, geotextile and geogrids; the second cushion layer is fine sand and/or medium coarse sand.
By adopting the technical scheme, the first cushion layer and the second cushion layer are arranged, so that the structural strength of the surface of the foundation is further improved, and the bearing capacity is improved; the lower floor is closely knit material, and the grit is covered on the upper strata, when guaranteeing the demand strength, the materials are simple, reduce construction cost.
In conclusion, the invention has the following beneficial effects:
(1) the interior of the debris flow soft foundation is tightly compacted layer by layer through a vibration system and a pressurization system, so that soil particles in the soft foundation are tightly compacted, the stability of the finished road foundation is ensured, and the method is suitable for the soil condition of a mountainous area;
(2) the arrangement of the cement piles further improves the structural strength and stability of the interior of the debris flow soft foundation;
(3) every three adjacent cement piles form a triangular prism in a surrounding manner in space; every three adjacent booster pipes surround and form another triangular prism in the space, the booster pipes and the cement piles are arranged alternately, so that the two triangular prisms in the space form mirror image intersection, the special structure ensures that the structure in the soft foundation is more stable, the problems of local collapse and the like are avoided, the construction safety and the structural stability of the finished road are improved, and the service life of the road is prolonged;
(4) the cement piles stretching into the soft foundation of the debris flow and the transverse cement boards laid on the surface layer of the soft foundation of the debris flow form a cement net with triangular meshes on the surface layer, and the inner and outer cement structures act together to further enhance the structural stability of the foundation layer.
Detailed Description
In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated for convenience in describing the present invention, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The invention discloses a construction method for paving a road on a debris flow soft foundation, which is mainly used for construction and paving of viscous soil in a mountainous area, and is the construction current situation of a debris flow site in the mountainous area as follows:
the soil quality of the area to be constructed mainly comprises a surface layer and a bottom mountain layer caused by debris flow, wherein the surface layer is clay soil with dense silt and is 3-5m thick; the bottom layer is soil with low softness and viscosity; the surface layer is provided with accumulated water, and the average thickness of the accumulated water is 1-3 cm; according to the standard lane width of 3.5m, the area is used as a bidirectional lane, the road surface is designed to be 7m, construction areas are additionally arranged on two sides and are respectively widened by 2m, namely the total width of the construction areas is 11 m.
The construction process of the invention is utilized to pave a road on the debris flow soft foundation, and the construction process specifically comprises the following operation steps:
(1) a water suction pump is communicated beside the debris flow area, a drainage plate is communicated, surface water is drained to a reservoir, water in the reservoir is recovered, and the water is used for preparing materials such as later-stage cement piles and the like, so that the water is saved and the environment is protected; after the surface water is drained, the surface of the soft foundation is aired for about 1 day until the surface of the soft foundation is slightly dry. In order to ensure that the water suction pump does not influence later-stage construction, the water suction pump is arranged in a 2m area expanded outside a 7m road.
(2) A, paving three layers of geotextile on the surface of the aired soft foundation, wherein the first layer is paved transversely, the second layer is paved longitudinally, and the third layer is paved transversely; reserving the positions where the vibration system and the pressurization system need to be placed when the geotextile is laid; uniformly embedding vibrating rods in the soft foundation at the reserved positions at intervals of 3m, wherein the embedding depth of a vibrating head is 8 m; uniformly burying pressurizing pipes at the reserved positions at intervals of 3m by using a board inserting machine, wherein the depth of the pressurizing pipes buried in the soft foundation is 8 m; wherein the vibrating rods and the booster pipes are arranged alternately at a distance of 1.5 m; the booster pump and the vibrator are left on the surface layer of the debris flow soft foundation, so that the control of the pressing strength and the vibration frequency is realized.
Wherein, every three and adjacent vibrating arms enclose a triangular prism structure in the space, every three and adjacent booster pipes enclose another triangular prism structure in the space, the two triangular prisms are arranged in a mirror image and crossed, so that the vibration and booster spaces are distributed in a crossed manner and act in a synergistic manner, soil particles in the debris flow soft foundation are compacted tightly, and the compaction and reinforcement effects are further realized by matching with the viscosity of the soil particles; the pressurizing system and the vibrating system are uniformly distributed at intervals, so that the problem that the soft foundation is unstable due to overlarge local stress is avoided, the structure is more stable, and the situations of local collapse and the like are avoided.
B. After the burying is finished, starting a booster pump and a vibrator, connecting the booster pump with a booster pipe, and continuously inflating and boosting the booster pipe; at the position with the depth of 8m, pressurizing and vibrating for 5h, and closing the pressurizing pump and the vibrator; lifting the booster pipe and the vibrating head by 0.5m to a position with a depth of 7.5m by using a lifting device, boosting and vibrating for 5h, and closing the booster pump and the vibrator; repeating the operation, lifting the booster pipe and the vibrating head to the position with the depth of 7m, boosting and vibrating for 5h, and closing the booster pump and the vibrator; repeating the operation, lifting to a position of 6.5m, and pressurizing and vibrating for 5 h; lifting to a position of 6m, and pressurizing and vibrating for 4 h; lifting to a position of 5.5m, and pressurizing and vibrating for 4 h; lifting to a position of 5m, and pressurizing and vibrating for 4 h; lifting to a position of 4.5m, and pressurizing and vibrating for 4 h; lifting to a position of 4m, and pressurizing and vibrating for 4 h; lifting to a position of 3.5m, and pressurizing and vibrating for 3 h; lifting to a position of 3m, and pressurizing and vibrating for 3 h; lifting to a position of 2.5m, and pressurizing and vibrating for 3 h; lifting to a position of 2m, and pressurizing and vibrating for 3 h; lifting to a position of 1.5m, pressurizing and vibrating for 3h, and closing the pressurizing pump and the vibrator; because the depth of the compaction tool is within 1.5m, compaction can be realized by rolling with heavy objects on the surface layer, and the operation of pressurizing and vibrating compaction in the compaction tool is not needed.
In the process, on one hand, the interior of the debris flow soft foundation is tightly compacted; on the other hand, the local overlarge or too much local bubbles exist in the soft foundation, so that the structural stability of the soft foundation is influenced, the local overlarge bubbles are eliminated and uniformly dispersed through the vibration pressurization process, collapse caused by overlarge local pressure is avoided, and the integral structural strength of the soft foundation is improved; in addition, as the soil with low viscosity and softness is about 5m and below the inside of the soft foundation, the soft soil with low viscosity is compacted by the vibration pressurization extending into the soil body, and the compact compaction effect is good; if the surface layer is rolled, a layer of barrier is formed on the lower layer because the viscosity of the soil layer of 3-5m is high, so that the rolling force on the upper part is difficult to deeply act on the soft soil on the lower layer, and the effect of compaction is difficult to achieve.
Wherein, at this vibration pressure boost in-process, if ponding appears in the soft basic top layer, then utilize the suction pump in time with its pump drainage to the cistern, avoid inside it permeates to soft base, influence normal construction arrangement. In the construction site operation of the embodiment, no accumulated water appears on the surface layer of the soft foundation, so the method can be carried out according to the normal process steps of the invention.
(3) C, disassembling the vibrating rod and the vibrating head from the soft foundation, and taking away the vibrator; a cement pile is driven into the position where each vibrating rod is originally embedded, and the depth of the cement pile is 6 m; the upper end of the cement pile extends out of the surface layer of the soft foundation of the debris flow; and embedding the pressure increasing pipe into the position with the depth of 5m in the soft foundation of the debris flow again to ensure that the transverse stress is generated on the cement pile.
Wherein, every three adjacent cement piles form a triangular prism in the space; every three adjacent pressure boost pipe encloses synthetic another triangular prism in the space, and pressure boost pipe and cement pile set up between each other and arrange, make two triangular prisms in the space form the mirror image alternately, and this special construction makes the inside structure of soft base more firm, makes the cement stake atress more even, avoids appearing the local scheduling problem that collapses, has improved the structural stability of construction safety nature and completion back road, the life of extension road. The cement pile is finally left in the soft foundation of the debris flow, plays a role of supporting the framework, and forms a space supporting framework together with the horizontal cement plate on the surface layer of the soft foundation, so that the overall structural strength of the matrix is improved. Even when severe environment or weather occurs, the road is not easy to damage, and debris flow cannot occur per se; even if other mountain debris flow stacks are blocked on the road, the bearing capacity is large enough not to be collapsed; and, when handling the debris flow of its top, have the rigid support of this road, better clearance for the efficiency and the progress of clearance, more do benefit to and open up the road for work such as rescue.
D. In the initial setting time of the cement pile, which is within 1.5h in the embodiment, the booster pump is closed, so that the cement pile is ensured to reach a better setting state; in the final setting time of the cement pile, namely within 12 days, intermittent inflating and pressurizing are carried out for 10 times, specifically: starting a booster pump, and closing the booster pump after inflating and boosting for 3 hours; after the interval is 6 hours, continuing inflating and pressurizing for 3 hours, and closing the pressurizing pump; repeating the operations, inflating and pressurizing for 3 hours after the interval is 6 hours, and closing the booster pump; after the interval is 12 hours, inflating and pressurizing for 3 hours, and closing the pressurizing pump; after the interval is 12 hours, inflating and pressurizing for 3 hours, and closing the pressurizing pump; after the interval is 24 hours, inflating and pressurizing for 3 hours, and closing the pressurizing pump; after the interval is 24 hours, inflating and pressurizing for 3 hours; after the interval of 48 hours, inflating and pressurizing for 3 hours; after the interval of 48 hours, inflating and pressurizing for 3 hours; after the interval of 72h, the air is pumped and pressurized for 3 h.
E. After the cement piles are initially solidified and before the cement piles are not completely solidified, the top ends of the adjacent cement piles are reinforced and connected by using a transverse cement plate, and a cement net consisting of triangular grid units is formed on the surface of the debris flow soft foundation; and building adhesive is selected between the transverse cement plate and the top end of the cement pile for adhesion.
(4) F, airing the cement net until the cement net is hardened and shaped, namely finishing the final setting of the cement pile, and dismantling the booster pump and the booster pipe; the geotextile is left in the base layer and is not taken out; spraying a cement curing agent on the surface layer of the cement mesh; and filling the gravel layer into the meshes of the cement net, and keeping the gravel layer and the upper end surface of the cement net to be flush. Wherein, the maximum cross-sectional dimension of rubble in the rubble layer is 0.3-0.5m, in order to realize packing more closely between the rubble, fill coarse powder sand into the gap of rubble, and roll compaction.
G. Two anti-cracking reinforcing nets are coated on the gravel layer and the upper layer of the cement net, grids of the two anti-cracking reinforcing nets are arranged in a crossed mode, and the net opening size of each anti-cracking reinforcing net is smaller than the size of gravel in the gravel layer.
H. Laying geotextile weaved cloth on the surface layer of the anti-cracking reinforcing net, and laying geogrid above the geotextile weaved cloth; and laying medium coarse sand above the geogrid, and laying fine sand above the medium coarse sand.
(5) And rolling the pavement of the area to be constructed to form a flat field, and paving the road with the bidirectional width of 7m according to the normal road paving requirement.
The vertical height of the surface of the soft foundation of the road paved by the construction process is reduced by about 1.5m, which shows that the interior of the soft foundation is more compact by using vibration and pressurization operation, the structural strength is improved, the bearing capacity of the paved road surface reaches 150kPa, the passing of 20T and above load-carrying vehicles is met, and the aim and the requirement of road operation are met.
It should be noted that in the process, the base layer sequentially comprises a cement mesh and a gravel layer, a double-layer anti-cracking reinforced net layer, a first cushion layer and a second cushion layer from bottom to top; the materials used for each layer can be flexibly selected and are not limited to the conditions listed in the above embodiments; the first cushion layer is one or more of bamboo strips, geotextile and geogrids, the upper layer is fine sand and/or medium coarse sand, and the fine sand and/or the medium coarse sand can be combined and paired with each other at will, and are not described herein again; if the non-patent applicant simply replaces the base layer with other materials, the non-patent applicant is considered to fall within the protection scope of the present invention without departing from the main idea and spirit of the construction process.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. A construction method for paving a road on a debris flow soft foundation is characterized by comprising the following steps:
(1) draining: dredging and discharging water in the area to be constructed to a reservoir;
(2) vibrating and compacting the interior of the soft foundation: embedding a vibration system and a pressurization system into the debris flow soft foundation, controlling the vibration frequency of the vibration system and the pressurization intensity of the pressurization system, and tightly compacting the interior of the debris flow soft foundation layer by layer;
(3) piling inside the soft foundation: dismantling the vibration system, driving a cement pile at the position where the vibration system is buried, controlling the pressurization system, and intermittently applying pressure to the interior of the debris flow soft foundation;
(4) paving a road base layer: dismantling the pressurizing system, and paving a base layer on the surface layer of the debris flow soft foundation;
(5) paving a road surface: rolling the solidified construction area to form a flat field and then paving a road;
the vibration system comprises a vibrator, a vibrating rod and a vibrating head; in the step (2), a vibrating rod and a vibrating head are buried in the debris flow soft foundation, and a vibrator is left on the surface of a construction area for control;
in the step (2), the vibration system and the pressurization system are arranged adjacently and uniformly at intervals;
and (3) driving a cement pile at the position where the vibrating rod is buried, wherein the upper end of the cement pile extends out of the surface layer of the debris flow soft foundation.
2. The construction method for paving a road on a debris flow soft foundation according to claim 1, wherein: the supercharging system comprises a supercharging pump and a supercharging pipe; in the step (2), the booster pipe is buried in the debris flow soft foundation, and the booster pump is remained on the surface of the construction area for control; the depth of the vibration system and the depth of the pressurization system extending into the soft foundation of the debris flow are the same.
3. The construction method for paving a road on a debris flow soft foundation according to claim 2, wherein: in the step (2), the pressurization system and the vibration system are controlled, and the embedding heights of the pressurization pipe and the vibration system are lifted at intervals according to the lifting speed of 0.5 m/time from bottom to top; and carrying out one-time height lifting every 3-5h of pressurization vibration.
4. The construction method for paving a road on a debris flow soft foundation according to claim 2, wherein: closing the booster pump within the initial setting time of the cement pile; and starting a booster pump within the final setting time of the cement pile, and intermittently pressurizing for 10 times according to the frequency of 3 hours of air inflation and pressurization for each time to reinforce the cement pile.
5. The construction method for paving a road on a debris flow soft foundation according to claim 4, wherein: after the cement piles are initially solidified, the top ends of the adjacent cement piles are reinforced and connected by using the transverse cement plates to form the cement net consisting of the triangular grid units.
6. The construction method for paving a road on a debris flow soft foundation according to claim 5, wherein: after the cement net is aired to be hardened and shaped, spraying a cement curing agent on the surface layer of the cement net; and filling the gravel layer into the meshes of the cement net, and keeping the gravel layer and the upper end surface of the cement net to be flush.
7. The construction method for paving a road on a debris flow soft foundation according to claim 6, wherein: and an anti-cracking reinforcing net is coated on the gravel layer and the upper layer of the cement net, and the size of a net opening of the anti-cracking reinforcing net is smaller than that of gravel in the gravel layer.
8. The construction method for paving a road on a debris flow soft foundation according to claim 7, wherein: and laying a first cushion layer and a second cushion layer on the surface layer of the anti-cracking reinforcing net in sequence.
9. The construction method for paving a road on a debris flow soft foundation according to claim 8, wherein: the first cushion layer is one or more of bamboo strips, geotextile and geogrids; the second cushion layer is fine sand and/or medium coarse sand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810805207.4A CN108867614B (en) | 2018-07-20 | 2018-07-20 | Construction method for paving road on debris flow soft foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810805207.4A CN108867614B (en) | 2018-07-20 | 2018-07-20 | Construction method for paving road on debris flow soft foundation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108867614A CN108867614A (en) | 2018-11-23 |
| CN108867614B true CN108867614B (en) | 2020-08-21 |
Family
ID=64303831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810805207.4A Active CN108867614B (en) | 2018-07-20 | 2018-07-20 | Construction method for paving road on debris flow soft foundation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108867614B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110644308A (en) * | 2019-10-16 | 2020-01-03 | 四川齐峰建设工程有限公司 | Construction method for paving road on debris flow soft foundation |
| CN112900436B (en) * | 2021-01-14 | 2022-05-06 | 武汉市市政路桥有限公司 | Construction process of highway soft foundation |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2804895B2 (en) * | 1994-11-14 | 1998-09-30 | 中富 栗本 | Improvement method for soft ground |
| CN101476325B (en) * | 2008-11-28 | 2010-08-11 | 华南理工大学 | Rigid gridding and pile combined foundation and its use in soft soil foundation reinforcement |
| CN102465523B (en) * | 2010-11-19 | 2013-09-18 | 葛辉 | Dry and dense resonance method for reinforcing soft soil foundation of new hydraulic-fill sand |
| CN105672241B (en) * | 2016-01-29 | 2017-07-25 | 太原理工大学 | Jet is broken ground, and the processing of joint air bag soil compaction is deep to shake the device and method for falling into property loess |
-
2018
- 2018-07-20 CN CN201810805207.4A patent/CN108867614B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108867614A (en) | 2018-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103628378B (en) | One is highway widening embankment structure and construction method near water | |
| CN203383119U (en) | Novel widening structure of highway embankment | |
| CN104278608A (en) | Novel highway embankment widened structure and construction method | |
| CN110306565B (en) | Road ecological slope protection system and construction method | |
| CN104264680B (en) | The method for processing foundation of Tian Wa joint portion, a kind of collapsible loess slope | |
| CN108867614B (en) | Construction method for paving road on debris flow soft foundation | |
| CN113445396A (en) | High-fill road foundation filling construction method for high liquid limit soil road section | |
| CN111778941A (en) | High-standard farmland channel construction method and structure | |
| CN110820456A (en) | Anti-settling and replacement-filling alternate airport runway and construction method thereof | |
| CN213805481U (en) | Gabion retaining wall | |
| CN211199978U (en) | Pavement paving structure for permeable sidewalk | |
| CN109113045A (en) | A kind of soft-soil foundation treatment method | |
| CN111676951A (en) | Construction method for treating shallow soft soil layer by combining stone throwing, silt squeezing and sand bag well treatment | |
| CN115418908B (en) | Pavement sponge seepage and drainage system and construction method | |
| CN101892675B (en) | Flexible retaining wall with rigid support | |
| CN214301048U (en) | Light embankment | |
| CN103898824B (en) | The method that Cold And Frozen-soil Regions roadbed processes substrate with plastic draining board | |
| CN112411619A (en) | Gabion retaining wall and construction method thereof | |
| CN111304986A (en) | Construction method for treating soft foundation settlement in plateau frozen soil area | |
| CN112359850A (en) | Masonry protection structure of road engineering and construction method thereof | |
| CN114108785B (en) | Pool bottom waterproof structure of oversized regulating and accumulating pool and construction process thereof | |
| CN215976797U (en) | Temporary overflowing temporary bridge structure | |
| CN213417451U (en) | Stone-throwing and silt-squeezing road foundation structure | |
| RU2176700C1 (en) | Method for protecting territory from flooding | |
| CN113430989B (en) | Lifting construction method for sea pond |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |