CN108486976B - Roadbed structure at mountain highway filling and digging junction and construction method thereof - Google Patents
Roadbed structure at mountain highway filling and digging junction and construction method thereof Download PDFInfo
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- CN108486976B CN108486976B CN201810406200.5A CN201810406200A CN108486976B CN 108486976 B CN108486976 B CN 108486976B CN 201810406200 A CN201810406200 A CN 201810406200A CN 108486976 B CN108486976 B CN 108486976B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
- E01C11/224—Surface drainage of streets
- E01C11/227—Gutters; Channels ; Roof drainage discharge ducts set in sidewalks
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- 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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C2201/00—Paving elements
- E01C2201/20—Drainage details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The invention relates to a roadbed structure at a filling junction of a mountain road and a construction method thereof, wherein the roadbed structure comprises a filling road section, a square digging road section and a transition section at the filling junction, a transition section step and a drainage open ditch are arranged on the filling road section, a drainage system at the filling junction is arranged at the transition section, the drainage system at the filling junction comprises a transverse drainage blind ditch assembled by a replaceable drainage body, a longitudinal through drainage blind ditch and a combined transition section of a permeable and water-proof layer at the filling junction, composite drainage small guide pipes are arranged in the drainage system at the filling junction and the transition section step, the bottoms of the composite drainage small guide pipes on the drainage system at the filling junction are connected with the longitudinal through drainage blind ditch, and the longitudinal through drainage blind ditch is communicated with the transverse drainage blind ditch assembled by the replaceable drainage body. According to the invention, the underground water level of the soil body in the slope can be monitored in time through the arranged observation holes, so that the inner inclination angle and the size of the step at the transition section of the stone road section are effectively controlled, the construction speed is accelerated, and the overall stability of the roadbed is improved.
Description
Technical Field
The invention relates to a novel mountain highway subgrade structure, in particular to a roadbed structure for filling and digging junction parts of mountain highways and a construction method thereof.
Background
With the arrival of large construction of expressways in China, especially the concept of "county and county high speed", expressway construction is transferred to mountain areas, mountain area expressway foundations are basically high-fill foundations, and filling and staggering are achieved. The high-fill roadbed is extremely easy to subside due to the fact that the roadbed is subjected to heavy dead weight, a construction period is short, a mountain area is long in rainy season and construction is not standard, and especially the roadbed is obvious in subsidence at a transverse and longitudinal filling junction, so that the problems of pavement cracking, subsidence and the like are caused, and the traffic safety is greatly influenced. Roadbed filling at high-speed filling and digging junctions in mountain areas is a prominent problem at present.
The traditional construction treatment of the filling and excavating juncture is divided into two treatment modes of longitudinal filling and excavating juncture and transverse filling and excavating juncture. The construction method mainly comprises the steps of over-digging and backfilling on an excavated road section and step excavation on a filled road section, wherein the construction mode has the main defects that the steps of the filled road section are insufficiently rolled, so that the later sedimentation is easily excessive, and in addition, the transition section at the junction of the filling and the backfilling is insufficient in combination of new roadbed and old roadbed, if reinforcement treatment is not carried out, the stability of the roadbed structure is seriously affected; the other side of the road is backfilled, the construction mode is very dependent on the transverse gradient of the road, the gradient is different, the construction mode is changed greatly, the applicability is relatively poor, the soil engineering cells are paved on the roadbed, the strength of the soil engineering cells is high, the lap joint requirement is high, and the construction difficulty is high.
In view of the above, it is currently necessary to find a novel roadbed for filling and digging a junction of a mountain highway, which has stable roadbed structure, good strength and bearing performance, sufficient rolling and small sedimentation, and a construction method thereof.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a roadbed structure for filling and digging a junction of a mountain highway and a construction method thereof.
The mountain area highway fills out and digs juncture roadbed structure, its characterized in that: the drainage system comprises a filling road section, a square digging road section and a filling junction transition section, wherein a transition section step and a drainage open ditch are arranged on the filling road section, the filling junction transition section is provided with a filling junction drainage system, the filling junction drainage system comprises a replaceable drainage body assembled transverse drainage blind ditch, a longitudinal through drainage blind ditch and a filling junction water permeable and water-proof layer combined transition section, a composite drainage small guide pipe is arranged in the filling junction water permeable and water-proof layer combined transition section and the transition section step, the bottom of the filling junction water permeable and water-proof layer combined transition section is connected with the longitudinal through drainage blind ditch, the longitudinal through drainage blind ditch is communicated with the replaceable drainage body assembled transverse drainage blind ditch, and the height of the replaceable drainage body assembled transverse drainage blind ditch is 1/3 of the height of the square digging road section and is arranged at the bottom of the square digging road section.
The mountain area highway fills out and digs juncture roadbed structure, its characterized in that: the utility model provides a removable drainage body assembled horizontal drainage frenulum includes that the drainage body is changed to pull formula guide arm area end plate and prefabricated assembled reinforced concrete frenulum, prefabricated assembled reinforced concrete frenulum middle part is equipped with vertical steel sheet, be two cell structures with it, prefabricated assembled reinforced concrete frenulum upper portion shop reinforcing bar net piece, two tracks have respectively been laid to every cell bottom surface, the drainage body is changed to pull formula guide arm area end plate sets up in the cell of prefabricated assembled reinforced concrete frenulum, the gyro wheel is installed to pull formula guide arm area end plate change drainage body bottom, the gyro wheel matches with the track, and can slide at the track, make the drainage body can freely slide into prefabricated assembled reinforced concrete frenulum is changed to pull formula guide arm area end plate.
The mountain area highway fills out and digs juncture roadbed structure, its characterized in that: the transition section at the filling junction is positioned between the filling road section and the excavation road section, the length range is not less than 10m, and the gradient of the transition section at the filling junction is 4%.
The mountain area highway fills out and digs juncture roadbed structure, its characterized in that: the transition section step is arranged below the transition section at the filling junction, the inward inclination angle is controlled within 4 degrees, and the rolling section at the step is small, so that the annular compression is adopted, the compaction blind area is effectively eliminated, and the soil compactness and the overall stability are improved.
The mountain area highway fills out and digs juncture roadbed structure, its characterized in that: the method comprises the steps that a composite drainage small conduit is respectively arranged on a water permeable and water-proof layer combined transition section in a filling road section and at a filling and digging junction, the composite drainage small conduit comprises a dense mesh net, a geotechnical cloth bag, a conical pile head, a grouting conduit and an expansion end plate, the grouting conduit is sequentially provided with the dense mesh net and the geotechnical cloth bag from inside to outside, and broken stones are filled between the dense mesh net and the grouting conduit; the bottom of the grouting conduit is connected with a conical pile head, the top of the grouting conduit is connected with an expansion end plate, a conical split is arranged on the conical pile head, an observation hole is formed in the lower surface of the expansion end plate, and the composite drainage small conduit is used for later grouting.
The mountain area highway fills out and digs juncture roadbed structure, its characterized in that: the transition section step is constructed by a static blasting method: an L-shaped static blasting hole is drilled in a filling section, static blasting agents are filled in the L-shaped static blasting hole, meanwhile, a horizontal integrated pressurized water supplementing pipe with a sealing plate and a lateral integrated pressurized water supplementing pipe with a sealing plate are installed, and outer end heads of the horizontal integrated pressurized water supplementing pipe with the sealing plate and the lateral integrated pressurized water supplementing pipe with the sealing plate are respectively fixed on a slope through end anchoring pieces, so that rock is burst through hydration reaction, and a transition section step is obtained.
The construction method of the roadbed structure at the mountain highway filling junction is characterized by comprising the following steps of:
the first step is to clean and compact the basal layer of the original slope, which comprises the steps of digging a longitudinal temporary ditch, digging out the longitudinal ditch, and making a ditch ridge outside the ditch by earth culture so as to prevent the surface water outside the roadbed from being discharged into the roadbed base; cutting trees, shrubs and the like in the land range of the roadbed before construction, removing surface soil, cleaning, flattening, sun-drying, flattening and compacting the base of the embankment, and removing surface soil by 200mm in the filled land, wherein the compactness is not less than 90%; filling sand, gravel, broken stone and other materials at the bottom of the embankment for reinforcement, so that a stable layer with good water stability is formed;
step two, excavating a transition section step at the position of a transition section at the filling junction on the filling section, and carrying out annular compaction;
the third step is that a transition section at the junction is excavated with a replaceable drainage body assembled transverse drainage blind ditch, the height of the replaceable drainage body assembled transverse drainage blind ditch is 1/3 of the height of a square-excavated road section, after the excavation is completed, a prefabricated reinforced concrete blind ditch is installed on the replaceable drainage body assembled transverse drainage blind ditch, a vertical steel plate is installed in the middle of the prefabricated reinforced concrete blind ditch, the prefabricated reinforced concrete blind ditch is in a two-cell structure, a reinforced mesh sheet is paved at the upper part of the prefabricated reinforced concrete blind ditch, and two rails are paved on the bottom surface of each cell; the drawing type guide rod with end plate replacement drainage body is arranged in a grid chamber of the prefabricated reinforced concrete blind ditch, the bottom of the drawing type guide rod with end plate replacement drainage body is provided with a roller, the roller is matched with a track and can slide on the track, so that the drawing type guide rod with end plate replacement drainage body can freely slide into the prefabricated reinforced concrete blind ditch, and the construction and installation of the prefabricated transverse drainage blind ditch with the replaceable drainage body are completed;
the fourth step, installing a longitudinal through drainage blind ditch above the assembly type transverse drainage blind ditch with the replaceable drainage body, then performing construction of a water permeable and water-proof layer combined transition section at a filling and digging junction above the longitudinal through drainage blind ditch, and performing enhanced pressure compensation, wherein the length of the water permeable and water-proof layer combined transition section at the filling and digging junction is not less than 10m, the water permeable and water-proof layer combined transition section at the filling and digging junction is subjected to combined construction by adopting a hydraulic rammer and drop hammer type dynamic rammer, and the compaction degree is not more than 96 percent, and the gradient is 4 percent;
the fifth step is that a compound drainage small duct is arranged on the transition section step, the compound drainage small duct is formed by winding a dense mesh net and a geotechnical cloth bag outside a grouting duct, broken stones are filled between the dense mesh net and the grouting duct, a conical pile head is arranged at the lower end part of the compound drainage small duct, an observation hole is formed in an enlarged end plate, a conical valve is arranged at the lower end part of the conical pile head, and the conical pile head is directly connected with the grouting duct; slope inclined pipe guides are arranged between the composite drainage small guide pipes, the slope inclined pipe guides are connected in series, and water in the slope can be discharged through the composite drainage small guide pipes and then through the slope inclined pipe guides;
and sixthly, slope construction is carried out on the filled road section, a drainage open ditch and the like are arranged at the bottom of the filled road section, and construction is carried out on the excavated road section.
The construction method of the roadbed structure at the mountain highway filling junction is characterized by comprising the following concrete steps of excavating transition section steps: sequentially drilling a plurality of L-shaped static blasting holes on the slope from top to bottom by using a drilling tool, wherein the width of each L-shaped static blasting hole is not less than 2.0m, the height is not more than 1.0m, the inner diameter is 50mm, and the L-shaped static blasting holes are transversely arranged at intervals of 0.3 m; in the embodiment of the invention, according to the size of the L-shaped static blasting hole, about 2.5kg of static blasting agent is needed, then an integral water supplementing pipe with a sealing plate and an integral water supplementing pipe with a lateral sealing plate are arranged on the L-shaped static blasting hole, the two water supplementing pipes are fixedly arranged on a slope 36 by using end anchoring pieces respectively, water is supplemented into the L-shaped static blasting hole through the water supplementing pipes, hydration reaction is carried out with the static blasting agent, heat is released, rock is burst and cracked, the construction process generally needs 3 hours, the crack is 3cm, the broken rock is removed by using an artificial pick after static blasting, and the gradient of a step is controlled within 4%. And (3) immediately starting to build and form from top to bottom at a time after the substrate is cleaned, and if the substrate cannot be built from top to bottom, at least 3 steps are reserved above each layer of filling soil, and then carrying out layered filling.
The construction method of the roadbed structure at the mountain highway filling and digging juncture is characterized in that the compaction method adopts annular compaction and is combined with hydraulic rolling equipment, thus being beneficial to the full distribution and uniformity of impact points, enhancing the overall effect and effectively eliminating compaction blind areas.
By adopting the technology, compared with the prior art, the invention has the following characteristics and beneficial effects:
1) The invention adopts a ring rolling mode, so that the defect of insufficient rolling at the excavation step can be overcome;
2) According to the invention, the water-permeable and water-resistant combined transition section at the filling and digging junction is arranged and is connected with the longitudinal through drainage blind ditch and the assembly type transverse drainage blind ditch with the replaceable drainage body, so that the water-proof and timely drainage can be realized, the bearing performance of the filling and digging junction is ensured, and the stability of the whole roadbed structure is ensured;
3) According to the invention, the composite drainage small guide pipe is buried at the step of the transition section and is matched with slope inclined pipe guide, so that the water level and water seepage problems in the roadbed can be monitored at any time, accumulated water in the roadbed can be timely discharged, the water level is reduced, thus the occurrence of geological disasters such as landslide and the like can be avoided, and the composite drainage small guide pipe can be used as a grouting pipe in the later stage;
4) According to the invention, the drainage body is replaced by the drawing guide rod with the end plate and combined with the prefabricated reinforced concrete blind ditch, so that the drainage body with damage can be replaced in time;
5) The static blasting construction method adopted in the invention can effectively control the inner dip angle and the size of the step of the transition section of the stone road section, thereby accelerating the construction speed.
Drawings
FIG. 1 is a schematic cross-sectional view of a high fill deep cut;
FIG. 2 is a schematic view of a roadbed structure at a mountain highway filling junction;
FIG. 3 is a schematic view of a composite drainage catheter;
FIG. 4 is a cross-sectional view of a lateral drain blind drain with a replaceable drain assembly;
FIG. 5 is a schematic illustration of a static blasting construction;
fig. 6 is an enlarged view at a in fig. 2.
Wherein: 1-a road section; 2-digging a road section; 3-filling and digging a transition section at the junction; 4-transition section steps; 5-a water permeable layer; 6-nailing the cement; 7-geogrid; 8-a replaceable drainage body assembled transverse drainage blind ditch; 9-draining open ditches; 10-a composite drainage small conduit; 11-dense mesh; 12-geotechnical cloth bags; 13-conical pile head; 14-breaking stone; 15-grouting guide pipe; 16-enlarged end plates; 17-conical split; 18-filling and digging a drainage system at the junction; 19-slope inclined tube guiding; 20-longitudinally penetrating drainage blind ditches; 21-filling and digging a water permeable and waterproof layer combined transition section at the junction; 22-a water-barrier layer; 23-embedding a vertical small duct into the head layer; 24-a reinforced foam concrete adjusting layer; 25-reinforcing steel bar meshes; 26-vertical steel plates; 27-prefabricating assembly type reinforced concrete blind ditches; 28-track; 29-a roller; 30-replacing the drainage body by the drawing guide rod with the end plate; 31-observation holes; 32-L-shaped static blast holes; 33-a horizontal integral pressurized water supplementing pipe with a sealing plate; 34-an integral pressurized water supplementing pipe with a sealing plate at the side direction; 35-end anchors; 36-slope; 37-original slope.
Detailed Description
The invention is further described below with reference to the accompanying drawings, but the scope of the invention is not limited thereto:
as shown in fig. 1-6, the road subgrade structure at the mountain highway filling junction comprises a filling road section 1, a cutting road section 2 and a filling junction transition section 3, wherein a transition section step 4 and a drain open ditch 9 are arranged on the filling road section 1, the filling junction transition section 3 is provided with a filling junction drainage system 18, the filling junction drainage system 18 comprises a replaceable drainage body assembled transverse drainage blind ditch 8, a longitudinal through drainage blind ditch 20 and a filling junction water permeable and water proof layer combined transition section 21, a composite drainage small guide pipe 10 is arranged in each of the filling junction water permeable and water proof layer combined transition section 21 and the transition section step 4, the bottom of the composite drainage small guide pipe 10 on the filling junction water permeable and water proof layer combined transition section 21 is connected with the longitudinal through drainage blind ditch 20, the longitudinal through drainage blind ditch 20 is communicated with the replaceable drainage body assembled transverse drainage blind ditch 8, and the height of the replaceable drainage body assembled transverse drainage blind ditch 8 is 1/3 of the height of the cutting road section 2, and the filling junction is arranged at the bottom of the cutting road section 2.
As shown in fig. 4, the replaceable drainage body assembled transverse drainage blind ditch 8 comprises a pull type guide rod and end plate replacement drainage body 30 and a prefabricated reinforced concrete blind ditch 27, a vertical steel plate 26 is arranged in the middle of the prefabricated reinforced concrete blind ditch 27 and is of two cell structures, a reinforced mesh 25 is paved on the upper part of the prefabricated reinforced concrete blind ditch 27, two rails 28 are paved on the bottom surface of each cell, the pull type guide rod and end plate replacement drainage body 30 is arranged in the cells of the prefabricated reinforced concrete blind ditch 27, a roller 29 is mounted at the bottom of the pull type guide rod and end plate replacement drainage body 30, the roller 29 is matched with the rails 28 and can slide on the rails 28, and the pull type guide rod and end plate replacement drainage body 30 can freely slide into the prefabricated reinforced concrete blind ditch 27.
The transition section 3 at the filling and digging junction is positioned between the filling road section 1 and the digging road section 2, the length range is not less than 10m, and the gradient of the transition section 3 at the filling and digging junction is 4%; the transition section step 4 is arranged below the transition section 3 at the filling junction, the inward inclination angle is controlled within 4 degrees, and the compaction blind area is effectively eliminated by adopting annular compression due to the small rolling section at the step, so that the soil compactness and the overall stability are improved.
As shown in the figure, the composite drainage small guide pipe 10 is respectively arranged in the filling road section 1 and on the water permeable and water resistant layer combined transition section 21 at the filling junction, and as shown in fig. 3, the composite drainage small guide pipe 10 comprises a dense mesh net 11, a geotechnical cloth bag 12, a conical pile head 13, a grouting guide pipe 15 and an expansion end plate 16, wherein the dense mesh net 11 and the geotechnical cloth bag 12 are sequentially arranged on the grouting guide pipe 15 from inside to outside, and broken stone 14 is filled between the dense mesh net 11 and the grouting guide pipe 15; the bottom of the grouting conduit 15 is connected with a conical pile head 13, the top of the grouting conduit is connected with an enlarged end plate 16, the conical pile head 13 is provided with a conical split 17, the lower surface of the enlarged end plate 16 is provided with an observation hole 31, and the composite drainage small conduit 10 is used for later grouting.
As shown in fig. 5, the transition section step 4 is constructed by a static blasting method, and is obtained by: an L-shaped static blasting hole 32 is drilled in the filling section 1, static blasting agents are filled in the L-shaped static blasting hole 32, meanwhile, a horizontal integral type pressurized water supplementing pipe 33 with a sealing plate and a lateral integral type pressurized water supplementing pipe 34 with a sealing plate are installed, and outer end heads of the horizontal integral type pressurized water supplementing pipe 33 with the sealing plate and the lateral integral type pressurized water supplementing pipe 34 with the sealing plate are respectively fixed on a slope 36 through end anchoring pieces 35, so that rocks are broken through hydration reaction, and a transition section step 4 is obtained.
As shown in fig. 1, the general mountain highway construction needs to perform the filling construction on the original slope surface 37, and when the roadbed structure of the filling junction is constructed, the roadbed structure of the filling junction includes a filling section 1, a junction transition section 3 and a digging section 2, which specifically includes the following steps:
the first step is to clean and compact the basal layer of the original slope surface 37, which comprises the steps of excavating a longitudinal temporary ditch, excavating soil in the longitudinal ditch, and making a ditch ridge on the outer side of the ditch so as to prevent the surface water on the outer side of the roadbed from being discharged into the roadbed base; cutting trees, shrubs and the like in the land range of the roadbed before construction, removing surface soil, cleaning, flattening, sun-drying, flattening and compacting the base of the embankment, and removing surface soil by 200mm in the filled land, wherein the compactness is not less than 90%; in order to avoid the substrate from being influenced by the groundwater level, the bottom of the embankment is filled with sand, gravel, broken stone and other materials which have excellent water stability and are not easy to weathere for reinforcement treatment, so that a stable layer with good water stability is formed.
The second step is to excavate the transition section step 4 at the position of the transition section 3 at the filling junction on the filling section 1, and perform annular compaction, and the specific process is as follows: step excavation is carried out according to a design drawing, as shown in fig. 5, a plurality of L-shaped static blastholes 32 are sequentially drilled from top to bottom on a slope 36 by using a drilling tool, the width of each L-shaped static blasthole 32 is not less than 2.0m, the height is not more than 1.0m, the inner diameter is 50mm, and each L-shaped static blasthole is transversely arranged at intervals of 0.3 m; in the embodiment of the invention, according to the size of the L-shaped static blasting hole 32, about 2.5kg is needed, a horizontal integral pressurized water supplementing pipe 33 with a sealing plate and a lateral integral pressurized water supplementing pipe 34 with a sealing plate are arranged on the L-shaped static blasting hole 32, the two supplementing pipes are fixedly arranged on a slope 36 by using an end anchoring piece 35 respectively, water is supplemented into the L-shaped static blasting hole 32 through the supplementing pipes, hydration reaction is carried out with the static blasting agent, heat is released, the rock body is burst and cracked, the construction process generally needs 3 hours, the crack is 3 centimeters, the broken rock body is preferably cracked by using an artificial pick after static blasting, and the gradient of the step is controlled to be less than 4%. And if the substrate cannot be built from top to bottom, at least 3 steps are reserved above each layer of filling soil, and then layered filling is carried out, the compaction method adopts annular compaction, and hydraulic rolling equipment is combined, so that the full distribution and uniformity of impact points are facilitated, the overall effect is enhanced, and the compaction blind area is effectively eliminated.
Thirdly, excavating a replaceable drainage body assembled transverse drainage blind ditch 8 at a transition section 3 at the junction, wherein the height of the replaceable drainage body assembled transverse drainage blind ditch 8 is 1/3 of the height of a excavated road section 2, and after excavation is completed, installing a prefabricated reinforced concrete blind ditch 27 on the replaceable drainage body assembled transverse drainage blind ditch 8, wherein the section size of the prefabricated reinforced concrete blind ditch 27 in the embodiment of the invention is 50 x 30cm as shown in fig. 4, the middle part of the prefabricated reinforced concrete blind ditch 27 is provided with a vertical steel plate 26, the vertical steel plate is in a two-cell structure, a reinforced mesh 25 is paved at the upper part of the prefabricated reinforced concrete blind ditch 27, and two tracks 28 are paved at the bottom surface of each cell respectively; the drawing type guide rod and end plate replacement drainage body 30 is arranged in a grid chamber of the prefabricated reinforced concrete blind ditch 27, the section size of the drawing type guide rod and end plate replacement drainage body 30 is 20 x 18cm, the bottom of the drawing type guide rod and end plate replacement drainage body is provided with rollers 29, the rollers 29 are matched with the rails 28 and can slide on the rails 28, so that the drawing type guide rod and end plate replacement drainage body 30 can freely slide into the prefabricated reinforced concrete blind ditch 27, and the construction and installation of the replaceable drainage body assembled type transverse drainage blind ditch 8 are completed.
A fourth step of installing a longitudinal through drain blind ditch 20 above the replaceable drain body assembled type transverse drain blind ditch 8, wherein the cross section of the longitudinal through drain blind ditch 20 is a circle with the radius of 20cm as shown in fig. 2 and 6; and then the construction of the water permeable and water resistant layer combined transition section 21 at the filling and digging junction is carried out above the longitudinal through drainage blind ditch 20, and the reinforcement and the pressure compensation are carried out, the length of the water permeable and water resistant layer combined transition section 21 at the filling and digging junction is not less than 10m, the compactness is not less than 96%, the gradient is 4%, the water permeable and water resistant layer combined transition section 21 at the filling and digging junction is respectively a double-layer geogrid 7, a water resistant layer 22, a water permeable layer 5, a vertical small guide pipe embedded head layer 23, the water resistant layer 22 and a reinforced foam concrete regulating layer 24 which are 5cm thick from top to bottom, the double-layer geogrid 7 is fixed on the water resistant layer 22 by adopting cement nails 6, and the geogrid should be straightened smoothly when laid, and the lower bearing layer is tightly clung, and no wrinkles are needed. The lower bearing layer is flat, hard protrusions are forbidden, the thickness of the water-resisting layer 22 is 3cm, SBS modified asphalt is adopted for the water-resisting layer 22, broken stone with the thickness of 2cm is filled under the water-resisting layer 22, a water-permeable layer 5 is formed, a vertical small conduit embedded head layer 23 with the thickness of 3cm, the water-resisting layer 22 with the thickness of 3cm and a reinforced foam concrete adjusting layer 24 with the thickness of 5cm are sequentially arranged under the water-permeable layer 5. The hydraulic rammer and drop hammer type dynamic compactor are adopted for the combined transition section 21 of the permeable and waterproof layer at the filling and digging junction, so that the combined effect is good. For areas with small construction sections, such as steps and corners, according to the effective compaction thickness of the hydraulic rammer, tamping layer by layer, adopting a drop hammer type dynamic compactor to reinforce other parts every 4 meters, adopting the hydraulic rammer and a 32 ton high-performance dynamic compaction vibration road roller to carry out combined compaction aiming at the areas with large construction sections, and forming an important drainage system 18 of a roadbed structure at the mountain highway filling and digging junction by the longitudinal through drainage blind ditch 20, the slope inclined pipe guide 19 and the replaceable drainage body assembled type transverse drainage blind ditch 8 after the construction is completed.
The fifth step is that a composite drainage small conduit 10 is arranged on a transition section step 4, the composite drainage small conduit 10 is formed by winding a dense mesh net 11 and a geotechnical cloth bag 12 outside a grouting conduit 15, broken stones 14 are filled between the dense mesh net 11 and the grouting conduit 15, the structural schematic diagram of the composite drainage small conduit 10 can be seen in fig. 3, the diameter of the composite drainage small conduit 10 is 42mm, the length of the composite drainage small conduit is 150mm, an enlarged end plate 16 is arranged at the upper end part of the composite drainage small conduit, a conical pile head 13 is arranged at the lower end part of the composite drainage small conduit, an observation hole 31 with the diameter of 10mm is formed in the enlarged end plate 16, and a conical valve 17 is arranged at the lower end part of the conical pile head 13 and is directly connected with the grouting conduit 15; slope inclined pipe guides 19 are arranged between the composite drainage small pipes 10, the composite drainage small pipes 10 are connected in series through the slope inclined pipe guides 19, and water in the slope can be discharged through the composite drainage small pipes 10 and then through the slope inclined pipe guides 19. And finally, constructing a slope 36, arranging a drain open channel 9 and the like on the filling section 1, and constructing the excavation section 2.
Claims (7)
1. Mountain area highway fills digs juncture roadbed structure, its characterized in that: the drainage system comprises a filling road section (1), a cutting road section (2) and a filling junction transition section (3), wherein a transition section step (4) and a drainage open ditch (9) are arranged on the filling road section (1), the filling junction transition section (3) is provided with a filling junction drainage system (18), the filling junction drainage system (18) comprises a replaceable drainage body assembled transverse drainage blind ditch (8), a longitudinal through drainage blind ditch (20) and a filling junction permeable and water-proof layer combined transition section (21), a composite drainage small guide pipe (10) is arranged in the filling junction permeable and water-proof layer combined transition section (21) and the transition section step (4), the bottom of the composite drainage small guide pipe (10) on the filling junction permeable and water-proof layer combined transition section (21) is connected with the longitudinal through drainage blind ditch (20), the longitudinal through drainage blind ditch (20) is communicated with the replaceable drainage body assembled transverse drainage blind ditch (8), the height of the replaceable drainage body assembled transverse drainage blind ditch (8) is 1/3 of the height of the cutting road section (2), and the filling junction is arranged at the bottom of the road section (2); the horizontal drainage blind ditch (8) with the replaceable drainage body comprises a drainage body (30) with an end plate and a prefabricated reinforced concrete blind ditch (27), wherein a vertical steel plate (26) is arranged in the middle of the prefabricated reinforced concrete blind ditch (27) and is of two cell structures, a reinforced mesh (25) is paved on the upper part of the prefabricated reinforced concrete blind ditch (27), two tracks (28) are paved on the bottom surface of each cell, the drainage body (30) with the end plate of the drainage rod is arranged in the cells of the prefabricated reinforced concrete blind ditch (27), rollers (29) are arranged at the bottoms of the drainage bodies (30) with the end plate of the drainage rod, the rollers (29) are matched with the tracks (28) and can slide on the tracks (28), so that the drainage body (30) with the end plate of the drainage rod can slide into the prefabricated reinforced concrete blind ditch (27) freely;
a composite drainage small pipe (10) is respectively arranged in a filling road section (1) and on a water permeable and water resistant layer combined transition section (21) at a filling junction, the composite drainage small pipe (10) comprises a dense mesh net (11), a geotechnical cloth bag (12), a conical pile head (13), a grouting pipe (15) and an expansion end plate (16), the dense mesh net (11) and the geotechnical cloth bag (12) are sequentially arranged on the grouting pipe (15) from inside to outside, and broken stones (14) are filled between the dense mesh net (11) and the grouting pipe (15); the bottom of the grouting conduit (15) is connected with a conical pile head (13), the top of the grouting conduit is connected with an enlarged end plate (16), a conical split (17) is arranged on the conical pile head (13), an observation hole (31) is formed in the lower surface of the enlarged end plate (16), and the composite drainage small conduit (10) is used for later grouting.
2. The mountain highway filling and excavation junction roadbed structure according to claim 1, wherein: the transition section (3) at the filling junction is positioned between the filling road section (1) and the excavation road section (2), the length range is not less than 10m, and the gradient of the transition section (3) at the filling junction is 4%.
3. The mountain highway filling and excavation junction roadbed structure according to claim 1, wherein: the transition section step (4) is arranged below the transition section (3) at the filling junction, the inward inclination angle is controlled within 4 degrees, and the annular compression is adopted because the rolling section at the step is small, so that the compaction blind area is effectively eliminated, and the soil compactness and the overall stability are improved.
4. The mountain highway filling and excavation junction roadbed structure according to claim 1, wherein: the transition section step (4) is constructed by a static blasting method: an L-shaped static blasting hole (32) is drilled in a filling road section (1), static blasting agents are filled in the L-shaped static blasting hole (32), meanwhile, a horizontal integrated pressurized water supplementing pipe (33) with a sealing plate and a lateral integrated pressurized water supplementing pipe (34) with a sealing plate are installed, the outer end heads of the horizontal integrated pressurized water supplementing pipe (33) with the sealing plate and the lateral integrated pressurized water supplementing pipe (34) with the sealing plate are respectively fixed on a slope (36) through end anchoring pieces (35), and rock is burst through hydration reaction, so that a transition section step (4) is obtained.
5. A construction method based on the roadbed structure of the mountain highway filling junction, which is characterized by comprising the following steps:
the first step is to clean and compact the basal layer of the original slope (37), which comprises the steps of excavating a longitudinal temporary ditch, excavating soil in the longitudinal ditch and cultivating the soil outside the ditch to form a ditch ridge so as to prevent the surface water outside the roadbed from being discharged into the roadbed base; cutting trees, shrubs and the like in the land range of the roadbed before construction, removing surface soil, cleaning, flattening, sun-drying, flattening and compacting the base of the embankment, and removing surface soil by 200mm in the filled land, wherein the compactness is not less than 90%; filling sand, gravel, broken stone and other materials at the bottom of the embankment for reinforcement, so that a stable layer with good water stability is formed;
step two, excavating a transition section step (4) at the position of a transition section (3) at the filling junction on the filling road section (1), and compacting in an annular mode;
the third step is to excavate the removable drainage body assembled horizontal drainage blind ditch (8) at the junction transition section (3), the height of the removable drainage body assembled horizontal drainage blind ditch (8) is 1/3 of the height of the excavated road section (2), after the excavation is completed, the prefabricated reinforced concrete blind ditch (27) is installed on the removable drainage body assembled horizontal drainage blind ditch (8), the vertical steel plate (26) is installed in the middle of the prefabricated reinforced concrete blind ditch (27), the vertical steel plate is in two cell structures, the reinforced steel mesh (25) is paved on the upper part of the prefabricated reinforced concrete blind ditch (27), and two tracks (28) are paved on the bottom surface of each cell respectively; the drawing type guide rod and end plate replacement drainage body (30) is arranged in a grid chamber of the prefabricated reinforced concrete blind ditch (27), a roller (29) is arranged at the bottom of the drawing type guide rod and end plate replacement drainage body (30), the roller (29) is matched with a track (28) and can slide on the track (28), so that the drawing type guide rod and end plate replacement drainage body (30) can freely slide into the prefabricated reinforced concrete blind ditch (27), and the construction and installation of the replaceable drainage body assembled transverse drainage blind ditch (8) are completed;
fourthly, installing a longitudinal through drainage blind ditch (20) above the assembly type transverse drainage blind ditch (8) with the replaceable drainage body, then constructing a combined transition section (21) of water permeable and water resistant layers at the filling and digging junction above the longitudinal through drainage blind ditch (20), and reinforcing and supplementing the pressure, wherein the length of the combined transition section (21) of water permeable and water resistant layers at the filling and digging junction is not less than 10m, the combined construction of the combined transition section (21) of water permeable and water resistant layers at the filling and digging junction is carried out by adopting a hydraulic rammer and a drop hammer type dynamic rammer, the compactness is not less than 96 percent, and the gradient is 4 percent;
the fifth step is that a compound drainage small duct (10) is arranged on a transition section step (4), the compound drainage small duct (10) is formed by winding a dense mesh net (11) and a geotechnical cloth bag (12) outside a grouting duct (15), broken stones (14) are filled between the dense mesh net (11) and the grouting duct (15), an enlarged end plate (16) is arranged at the upper end part of the compound drainage small duct (10), a conical pile head (13) is arranged at the lower end part of the compound drainage small duct (10), an observation hole (31) is arranged in the enlarged end plate (16), a conical valve (17) is arranged at the lower end part of the conical pile head (13) and is directly connected with the grouting duct (15), a slope inclined duct guide (19) is arranged between the compound drainage small ducts (10) and connected in series through the slope inclined duct guide (19), and water in a slope can be discharged through the compound drainage small duct (10) and the slope inclined duct guide (19);
and sixthly, constructing a slope (36) of the filling section (1), arranging a drain open ditch (9) and the like at the bottom of the filling section (1), and constructing the excavation section (2).
6. The construction method of the roadbed structure at the mountain highway filling and excavation juncture, which is characterized in that the concrete process of excavating the transition section step (4) in the step two is as follows: sequentially drilling a plurality of L-shaped static blasting holes (32) on the slope (36) from top to bottom by using a drilling tool; placing a static blasting agent which is configured in advance into a pore canal of an L-shaped static blasting hole (32), then installing a horizontal integrated pressurized water supplementing pipe (33) with a sealing plate and an integrated pressurized water supplementing pipe (34) with a lateral sealing plate on the L-shaped static blasting hole (32), respectively fixedly installing the two supplementing pipes on a slope (36) by utilizing an end anchoring piece (35), supplementing water into the L-shaped static blasting hole (32) through the supplementing pipes, carrying out hydration reaction with the static blasting agent, releasing heat, cracking rock body burst, and then chiseling broken rock body by utilizing a manual pick to control the gradient of a step to be within 4 percent; and immediately starting to construct and form the substrate from top to bottom at one time after the substrate is cleaned, and if the substrate cannot be constructed from top to bottom, reserving at least 3 steps above each layer of filling soil, and then performing layered filling.
7. The construction method of the roadbed structure at the mountain highway filling and excavation juncture of claim 6, wherein the compaction method adopts annular compaction and is combined with hydraulic rolling equipment.
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| CN109610435B (en) * | 2019-01-29 | 2023-09-12 | 中国机械设备工程股份有限公司 | Loess high fill valley foundation drainage structure and laying method thereof |
| CN110055831A (en) * | 2019-04-28 | 2019-07-26 | 中铁二院工程集团有限责任公司 | A kind of abrupt slope high-speed railway concrete rigid short circuit based structures and construction method |
| CN110172884B (en) * | 2019-06-04 | 2024-02-13 | 中信国安建工集团有限公司 | Mountain highway subgrade and construction method |
| CN112681043B (en) * | 2020-12-18 | 2022-08-23 | 湖北省路桥集团有限公司 | Roadbed splicing widening structure and construction method |
| CN113403904A (en) * | 2021-07-21 | 2021-09-17 | 中信国安建工集团有限公司 | Highway filling and digging boundary roadbed structure and construction operation method |
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