CN212199870U - Anti-bulging structure of ballastless track tramcar on strongly expansive soil or expansive rock section - Google Patents
Anti-bulging structure of ballastless track tramcar on strongly expansive soil or expansive rock section Download PDFInfo
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- CN212199870U CN212199870U CN202020451537.0U CN202020451537U CN212199870U CN 212199870 U CN212199870 U CN 212199870U CN 202020451537 U CN202020451537 U CN 202020451537U CN 212199870 U CN212199870 U CN 212199870U
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Abstract
The utility model discloses an anti uplift structure of ballastless track tram in soil or the expansion rock section of strong inflation, including changing back-up course, compound drainage blanket and deep drainage french drain of preventing, change back-up course and fill up on soil or the expansion rock foundation of strong inflation, change and adopt foundation bed bottom A group to pack and foundation bed bottom B group to pack in the back-up course, compound drainage blanket of preventing is arranged in changing back-up course and the soil or the expansion rock foundation of strong inflation and is used for leading-in deep drainage french drain with groundwater between. Fill through bed bottom A group and B group and pack and trade and fill strong inflation soil or the expandable rock that expansibility and hyperconcentration nature are strong, make it meet water or when excavating the cutting, can reduce and encircle power and deformability, make it have certain stability, and in time with the leading-in deep drainage blind ditch of groundwater through compound drainage layer of preventing, thereby avoid leading to its uplift in groundwater infiltration strong inflation soil or the expandable rock, effectively solved the uplift problem that strong inflation soil or expandable rock meet the water inflation and arouse, satisfy the requirement to the ride comfort, structure safe and reliable, construction convenience is swift.
Description
Technical Field
The utility model relates to a soil or the expansion rock engineering field of expanding by force, especially soil or the expansion rock section ballastless track tram anti uplift structure of expanding by force.
Background
The strong expansive soil or expansive rock has strong expansibility and hyperconjugability, and can generate larger upwarp force when meeting water or cutting unloading excavation, which is a technical problem to be faced by the construction of the tramcar in the expansive soil or expansive rock section.
In the prior art, the ballastless track of the tramcar generally adopts an anchor cable and an anchor rod to reinforce the foundation through expansive soil or an expansive rock section, but when the expansive force is large and the underground water level is shallow, the problems that the reinforcing effect of the anchor cable or the anchor rod is poor, the foundation bed is influenced by underground water fluctuation and the like are faced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the problems that in the prior art, when the expansive force is large and the underground water level is shallow, the reinforcing effect of an anchor rope or an anchor rod is poor and a foundation bed is influenced by the fluctuation of the underground water, the anti-bulging structure of the ballastless track tramcar in the strongly expansive soil or expansive rock section is provided.
In order to realize the purpose, the utility model discloses a technical scheme be:
the anti-bulging structure of the ballastless track tramcar on the strongly expansive soil or expansive rock section comprises a replacement and filling layer, a composite drainage preventing layer and a deep drainage blind ditch;
the replacement and filling layer is filled on the foundation of the strong expansive soil or expansive rock, and the foundation bed bottom layer A group of fillers and the foundation bed bottom layer B group of fillers are adopted in the replacement and filling layer;
the composite water-proof and drainage layer is positioned between the backfill layer and the strong expansive soil or expansive rock foundation and is used for guiding the underground water into the deep drainage blind ditch.
Through the structure, the filler properties of the group A filler of the bed bottom and the group B filler of the bed bottom are stable, the filling effect is good, the compaction degree is high, the strong expansive soil or expansive rock with strong expansibility and super-consolidation is filled by the group A filler of the bed bottom and the group B filler of the bed bottom, when the strong expansive soil or expansive rock meets water or excavates a cutting, the arching force and the deformation capacity can be reduced, the composite waterproof and drainage layer has certain stability, the composite waterproof and drainage layer is used for preventing water in the filling layer from permeating the strong expansive soil or the expansive rock at the lower part, meanwhile, underground water can be timely guided into a deep drainage blind ditch, the underground water is prevented from permeating into the strong expansive soil or the expansive rock to cause uplift, the uplift problem caused by the water expansion of the strong expansive soil or the expansive rock is effectively solved, and the composite waterproof and drainage layer can also prevent the underground water in the foundation of the strong expansive soil or the expansive rock from entering the filling layer, so as to meet the requirements of, the structure is safe and reliable, the construction is convenient and fast, and the application prospect is wide.
As the utility model discloses an optimal scheme, drainage bed is prevented including two-layer middlings gross sand layer and the compound drainage isolation pad of one deck to compound, and compound drainage isolation pad is located between the two-layer middlings gross sand layer. Through the structure, the middle composite drainage isolation pad is used for forming the drainage channel, the coarse sand layers in the upper layer and the lower layer are used for forming the support to prevent the composite drainage isolation pad from being embedded into the drainage channel, and the composite drainage isolation pad has higher drainage performance.
As the utility model discloses a preferred scheme, compound drainage isolation pad includes filament non-woven geotechnological cloth, isolation pad and two cloth membranes, and filament non-woven geotechnological cloth is located the top of isolation pad, and two cloth membranes are located the bottom of isolation pad. Through above-mentioned structure, the non-woven geotechnological cloth of filament has the effect that oozes water and permeate water, and the isolation pad has the characteristic that warp the resilience, and the effect that can play buffering and diffusion to the load of upper portion train transmission to the lower part and the lower part arch force that the lower part did not trade the filling layer and meet the water and produce, and the water-proof effects of two cloth membranes is fine, makes compound drainage isolation pad not only can prevent and drain water, can also cushion and diffusion load.
As the utility model discloses an optimal scheme, drainage blanket is prevented to compound is higher than the both sides of drainage blanket along road width direction's middle part. Through the structure, the water in the composite waterproof and drainage layer can flow towards a limited direction.
As the preferred scheme of the utility model, the deep drainage french drain is located and trades filling bed bottom both sides. Through the structure, the deep drainage blind ditches are excavated on the two sides of the bottom of the backfill layer, so that underground water can be drained into the deep drainage blind ditches.
As the utility model discloses an optimal scheme, the interval is equipped with the sump pit on the deep drainage french drain, and the sump pit is used for connecting municipal drainage pipe network. Through above-mentioned structure, introduce municipal drainage pipe network through the sump pit and in time discharge.
As the utility model discloses an optimal scheme, the anti uplift structure of strong inflation soil or inflation rock section ballastless track tram still includes track structure and bed top layer, and the bed top layer is located the top of filling the layer, and track structure is located the top on bed top layer. The foundation bed bottom layer is used as the foundation of the track structure, can enhance the line strength, enables the track structure to be firmer and more stable, has the deformation resistance, and can diffuse the stress acting on the foundation bed bottom layer.
As the preferred proposal of the utility model, the bottom of the backfill layer is positioned below the atmosphere sharp influence layer. Through the structure, the deformation problem of the replacement and filling layer is effectively controlled.
Atmospheric effects sharp depths of layer, i.e. depths where atmospheric effects are particularly significant, typically 45% of the depth of atmospheric effects. The atmospheric influence depth refers to the effective depth of the soil which is caused by precipitation, evaporation, ground temperature and other factors to lift and deform under the action of natural climate.
As the preferred scheme of the utility model, the bed bottom A group packs and the bed bottom B group packs and lays according to the layer.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
the group A of the bedding bottom filler and the group B of the bedding bottom filler have stable filler properties, good filling effect and high compaction degree, the strong expansive soil or expansive rock with strong expansibility and hyperconcentration can be filled by the group A of the bedding bottom filler and the group B of the bedding bottom filler, the upwarp force and the deformability can be reduced when the filler meets water or excavates a cutting, the composite waterproof and drainage layer has certain stability, the composite waterproof and drainage layer is used for preventing water in the filling layer from permeating the lower strong expansive soil or expansive rock, simultaneously can guide underground water into a deep drainage blind ditch in time, avoids the underground water from permeating the strong expansive soil or expansive rock to cause the uplift of the soil or the expansive rock, effectively solves the uplift problem caused by the water expansion of the strong expansive soil or the expansive rock, and can prevent the underground water in the foundation of the strong expansive soil or the expansive rock from entering the filling layer, thereby meeting the requirement of smooth tramway, the structure is safe and reliable, the construction is convenient and fast, and the application prospect is wide.
Drawings
FIG. 1 is the design drawing of the cross section of the ballastless track foundation reinforcement structure of the strong expansive soil or expansive rock section tramcar.
Fig. 2 is a schematic structural view of the composite drainage isolation pad of the present invention.
Icon: 1-a track structure; 2-bedding surface layer; 3-replacing and filling the layer; 4-deep drainage blind ditch; 5-composite water-proof and drainage layer; 51-composite drainage isolation pad; 511-filament non-woven geotextile; 512-isolation pad; 513-two cloth films; 6-strong expansive soil or expansive rock foundation.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Examples
As shown in fig. 1-2, the present embodiment provides an anti-humping structure of a ballastless track tramcar in a strongly expansive soil or expansive rock section, which comprises a track structure 1, a bed bottom layer 2, a backfill layer 3, a deep drainage blind ditch and a composite drainage-preventing layer.
The bed bottom layer 2 is positioned on a strong expansive soil or expansive rock foundation 6, and the track structure 1 is positioned on the bed bottom layer 2.
And in the construction process, determining the depth of the atmosphere sharp influence layer according to the depth of the geologic body of the construction site.
The exchange and filling layer 3 is filled on the strong expansive soil or expansive rock foundation 6 and is positioned below the atmosphere sharp influence layer, the exchange and filling layer 3 is filled with a foundation bed bottom layer A group filler and a foundation bed bottom layer B group filler, concretely, the foundation bed bottom layer A group filler adopts gravels and gravels with good gradation and fine particle content of less than 15%, the foundation bed bottom layer B group filler adopts gravels, coarse sand, medium sand or gradation discontinuity with fine particle content of less than 15%, the fine particle content of less than 15% and less than 5mm is more than 35% of angle gravels, round gravels, pebbles and the like; the group A of the bed bottom layer filler and the group B of the bed bottom layer filler are laid according to layers.
The composite water-proof and drainage layer 5 is positioned at the bottom of the backfill layer 3, specifically, the composite water-proof and drainage layer 5 comprises two layers of medium-coarse sand layers and one layer of composite drainage isolation pad 51, and the composite drainage isolation pad 51 is positioned between the two layers of medium-coarse sand layers; the middle part of the composite water-proof and drainage layer 5 is higher than the two sides of the composite water-proof and drainage layer 5 along the road direction, so that the gradient of the composite water-proof and drainage layer 5 is 4 degrees.
The composite drainage isolation pad 51 comprises a filament non-woven geotextile 511, an isolation pad 512 and two cloth membranes 513, wherein the filament non-woven geotextile 511 is positioned at the top of the isolation pad 512, the two cloth membranes 513 are positioned at the bottom of the isolation pad 512, the filament non-woven geotextile 511 has the functions of water seepage and water permeation, the isolation pad 512 has the characteristic of deformation and resilience, and can play a role in buffering and diffusing the load transmitted from an upper train to a lower part and the upward arching force generated by the water in the lower un-replaced layer, and the two cloth membranes 513 have good waterproof effect, so that the composite drainage isolation pad 51 can not only prevent drainage but also buffer and diffuse the load, specifically, the thickness of the composite drainage isolation pad 51 is not less than 5cm, the compressive strength of the composite drainage isolation pad 51 is not less than 100Kpa, and the two cloth membranes comprise geotextile and geomembranes.
The number of the deep drainage blind ditches 4 is two, the deep drainage blind ditches 4 are positioned at two sides of the composite water-proof drainage layer 5, at least two water collecting wells are arranged on each deep drainage blind ditch 4 at intervals, and specifically, at least two water collecting wells are arranged on each deep drainage blind ditch 4 at intervals of 50-100 m.
The beneficial effect that strong inflation soil or inflation rock section ballastless track tram anti-heave structure that this embodiment provided lies in:
the filler of the group A of the bedding bottom and the filler of the group B of the bedding bottom have stable properties, good filling effect and high compaction degree, and the filler of the group A of the bedding bottom and the filler of the group B of the bedding bottom are used for replacing and filling strong expansive soil or expansive rock with strong expansibility and hyperconcentration property, so that the arching force and the deformation capacity can be reduced when the filler of the group A of the bedding bottom meets water or excavates a cutting, and the filler has certain stability, safe and reliable structure, convenient and quick construction and wide application prospect;
the composite drainage isolation pad 51 in the middle of the composite waterproof and drainage layer 5 is used for forming a drainage channel, the coarse sand layers in the upper layer and the lower layer are used for forming a support to prevent the composite drainage isolation pad 51 from being embedded into the drainage channel, and the composite waterproof and drainage layer 5 has high drainage performance, the middle part of the composite waterproof and drainage layer 5 in the width direction of the road is higher than the two sides of the composite waterproof and drainage layer 5 in the width direction of the road, so that the gradient of the composite waterproof and drainage layer 5 is 4 degrees, water in the composite waterproof and drainage layer 5 can flow towards a limited direction, the composite waterproof and drainage layer 5 is used for preventing water in the backfill layer 3 from permeating into strong expansive soil or expansive rock at the lower part, and simultaneously can lead out the water inside, and avoids the water from influencing the strong expansive soil or expansive rock to cause;
the filament non-woven geotextile 511 has the functions of water seepage and water permeation, the isolation pad 512 has the characteristic of deformation and resilience, and can play a role in buffering and diffusing the load transmitted from an upper train to a lower part and the arching force generated by the water in the lower non-filled layer, and the waterproof effect of the two cloth membranes 513 is good, so that the composite drainage isolation pad 51 can not only prevent drainage, but also buffer and diffuse the load;
the foundation bed bottom layer 2 is positioned on the strong expansive soil or expansive rock foundation 6, the track structure 1 is positioned on the foundation bed bottom layer 2, and the foundation bed bottom layer 2 is used as the foundation of the track structure 1, so that the line strength can be enhanced, the track structure 1 is firmer and more stable, has the deformation resistance, and can diffuse the stress acting on the foundation bed bottom layer 2;
deep drainage french drain 4 can in time draw forth groundwater, introduces municipal drainage pipe network through the sump pit with groundwater and in time discharges, thereby avoids groundwater to lead to its uplift to strong inflation soil or inflation rock ground 6 production influence, thereby the effectual uplift problem that strong inflation soil or inflation rock meet the water inflation and arouse of having solved satisfies the tramcar to the requirement of ride comfort.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The anti-bulging structure of the ballastless track tramcar on the strongly expansive soil or expansive rock section is characterized by comprising a replacement and filling layer (3), a composite water-proof and drainage layer (5) and a deep drainage blind ditch (4);
the replacement and filling layer (3) is filled on a strong expansive soil or expansive rock foundation (6), and a bed bottom layer A group of fillers and a bed bottom layer B group of fillers are adopted in the replacement and filling layer (3);
the composite water-proof and drainage layer (5) is located between the backfill layer (3) and the strong expansive soil or expansive rock foundation (6), and the composite water-proof and drainage layer (5) is used for guiding underground water into the deep drainage blind ditch (4).
2. The anti-humping structure for a ballastless track tram of a strongly expansive soil or expansive rock section as claimed in claim 1, wherein said composite water drainage prevention layer (5) comprises two medium coarse sand layers and one composite water drainage isolation pad (51), said composite water drainage isolation pad (51) being located between two said medium coarse sand layers.
3. The ballastless track tram anti-hump structure of strongly expansive soil or expansive rock section according to claim 2, wherein said composite drainage isolation pad (51) comprises a filament non-woven geotextile (511), an isolation pad (512) and two cloth one membranes (513), said filament non-woven geotextile (511) being located on top of said isolation pad (512), said two cloth one membranes (513) being located on bottom of said isolation pad (512).
4. The anti-humping structure for the ballastless track tram with the highly expansive soil or expansive rock section according to claim 1, wherein the middle part of the composite water-proof and drainage layer (5) in the width direction of the road is higher than the two sides of the composite water-proof and drainage layer (5) in the width direction of the road.
5. The anti-humping structure of a ballastless track tramcar with high expansive soil or rock expansive section according to claim 3, wherein the deep drainage blind ditches (4) are positioned at two sides of the bottom of the backfill layer (3).
6. The anti-uplift structure of the ballastless track tramcar on the strongly expansive soil or expansive rock section as claimed in any one of claims 1 to 4, wherein water collecting wells are arranged on the deep drainage blind ditches (4) at intervals and are used for connecting municipal drainage pipe networks.
7. The ballastless track tram anti-hump structure of strongly expansive soil or expansive rock section according to claim 5, characterized by further comprising a track structure (1) and a bed surface layer (2), wherein the bed surface layer (2) is located on top of the backfill layer (3), and the track structure (1) is located on top of the bed surface layer (2).
8. The strong expansive soil or expansive rock section ballastless track tram anti-hump structure according to claim 1, characterized in that the bottom of the backfill layer (3) is located below the atmospheric sharp impact layer.
9. The strong expansive soil or expansive rock section ballastless track tram anti-hump structure of claim 1, wherein the bed bottom layer group A filler and the bed bottom layer group B filler are laid in layers.
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| CN202020451537.0U CN212199870U (en) | 2020-03-31 | 2020-03-31 | Anti-bulging structure of ballastless track tramcar on strongly expansive soil or expansive rock section |
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| CN202020451537.0U CN212199870U (en) | 2020-03-31 | 2020-03-31 | Anti-bulging structure of ballastless track tramcar on strongly expansive soil or expansive rock section |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111304969A (en) * | 2020-03-31 | 2020-06-19 | 中铁二院工程集团有限责任公司 | Anti-bulging structure of ballastless track tramcar on strongly expansive soil or expansive rock section |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111304969A (en) * | 2020-03-31 | 2020-06-19 | 中铁二院工程集团有限责任公司 | Anti-bulging structure of ballastless track tramcar on strongly expansive soil or expansive rock section |
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