The construction method of roadbed widening structure
The present invention relates to a kind of construction methods of roadbed widening structure, belong to road construction technical field, existing for solving
Have present in roadbed widening structure it is easily settled, sliding the problems such as, suitable for have embankment Widening Construction.
With the fast development of national economy and society, the variation and the life of the people, trip side of regional economy
The change of formula, original standard path have been unable to satisfy the demand for development of Modern Traffic, and a large amount of local roads need upgrading.
But the structure and its construction technology of road widening now frequently result in road surface and excessive differential settlement, pavement cracking, office occur
The diseases such as portion's depression, main reason is that:
(1) new and old roadbed widen processing after binding site roadbed material and road surface structare layer thickness, intensity it is different, especially
It is on one side original old road base on one side newly to do roadbed, there is also differences for quality, generate a critical surface in binding site, are road
Road cracking leaves hidden danger.
(2) different in binding site settling amount after new and old roadbed widens processing, certain sedimentation difference is generated, especially
New widening subgrade settlement after construction is larger, and old road base has been completed comparable settlement amount after construction, is inevitably tying in this way
It closes position and generates a differential settlement value mutation point, become the main reason for road generates crack.
(3) new and old roadbed binding site technique is more complex, and difficulty of construction is larger, often generate herein artificial quality because
Design standard is not achieved in element, such as compactness, and one of the reason of generation crack.
It can be seen that the above problem has seriously affected the quality and service life after road widening, in consideration of it, needing to invent at present
A kind of new roadbed widening structure and construction method, have the advantage that
(1) settling amount of new widening subgrade and the differential settlement of new and old roadbed are small.
(2) foundation stability of new and old roadbed binding site is good, to solve reflection caused by the differential settlement of new and old roadbed
(3) bond strength of new and old roadbed is high, mitigates new and old roadbed because of the difference of material, quality and road surface structare layer with this
The harm Deng caused by.
The present invention uses prefabricated side plate and prefabricated assembled lateral plate, and construction efficiency is high, and new roadbed backfill layer is delayed by top
Slag backfills layer and lower part cellular concrete backfill layer composition, and transverse steel net is arranged at step in cellular concrete backfill layer
Piece effectively improves the fixed effect between new roadbed and former roadbed and is connected and agrees with intensity, also enhance new roadbed intensity and
Roadbed side slope stability has preferable economic technology benefit.
Summary of the invention
The purpose of the present invention is to provide the fixed effect between a kind of new roadbed and former roadbed and it is connected and agrees with intensity height,
The construction method of the good roadbed widening structure of new roadbed side slope stability.
To realize the above-mentioned technical purpose, the invention adopts the following technical scheme:
A kind of construction method of roadbed widening structure, which is characterized in that the roadbed widening structure includes prefabricated side plate, pre-
The lateral plate of assembled (9), cast-in-place concrete bottom plate (23) and bubble concrete backfill layer (16) processed；The friendship of former roadbed and new roadbed
Interface side slope is set as step-like, and prefabricated side plate is set to cast-in-place concrete base tub (34) two sides, passes through side plate soil nailing (25)
It is fixed with lower curing soil layer (28) and original place table (26)；Prefabricated assembled lateral plate (9) is set on side plate rib block (27), and two
Side is respectively arranged with oblique auxiliary outer strut (21) and horizontal internal overarm support (20), is internally provided with vertical prestressed reinforcement (11),
Lower part is provided with junction steel plate (32)；New roadbed backfill layer delays slag backfill layer (12) by top and lower part cellular concrete backfills layer
(16) it forms, cellular concrete, which backfills, is arranged transverse steel mesh sheet (15) at layer (16) interior step；New roadbed backfill layer is backfilled to
Between prefabricated assembled lateral plate (9) and step-like side slope；
The construction method the following steps are included:
Step 1: former road excavation finishing: removing the fertile soil of former road bed first, former roadbed with will be laid with
The interface of new roadbed modifies out step-like side slope；
Step 2: solidification soil layer construction: in new roadbed and original place table handover region, manually or mechanically excavating the soil body, will be native
Backfill paves and is compacted after body mix soil-solidified-agent, forms solidification soil layer (28)；
Step 3: concrete floor first prefabricated side plate installation: is excavated out on solidification soil layer (28) top according to design drawing
Slot (34) installs prefabricated side plate after notch finishing, installs prefabricated L shape side plate (31), other side installation close to original barricade (19) side
Prefabricated Z-shaped side plate (24), the side plate rib block end part aligning of both sides side plate bottom extended segment is simultaneously close to, while installing soil nailing and being consolidated
It is fixed；
Step 4: prefabricated assembled lateral plate construction: before prefabricated assembled lateral plate (9) installation, in advance in former barricade
(19) U-shaped steel hoop (17) are installed at top, then are lifted prefabricated assembled lateral plate (9) to prefabricated side plate rib block using crane
(27) on, verticality is kept by installing oblique auxiliary outer strut (21) and horizontal internal overarm support (20), is subsequently mounted and vertically answers in advance
Power reinforcing bar (11), timely perfusion mortar after tensioning, and vertical prestressed reinforcement (11) are anchored；
Step 5: cast-in-place concrete construction of bottom plates: baseplate reinforcing bar is bound according to design requirement, part vertical reinforcement passes through pre-
The lateral plate of assembled (9) bottom junction steel plate (32) processed, casting concrete is to designed elevation after the completion of binding, and conserves；
Step 6: cellular concrete backfills layer construction: cellular concrete uses back-filling in layers, often fills the laying of level-one step
One layer of transverse steel mesh sheet (15) is until designed elevation, transverse steel mesh sheet (15) are fixed using mesh sheet soil nailing (14)；
Step 7: slag of delaying backfills layer construction: before slag of delaying backfill, being laid in advance in cellular concrete backfill layer (16) top surface anti-
Water geotextiles (13), then it is backfilled to designed elevation, and in the pre-buried prefabricated lamp holder (3) of design position, slag of delaying backfills layer (12) side slope
It is laid with ecological grass mat；
Step 8: road surface and mating setting construction: road surfacing is carried out according to design requirement, and street lamp (3), guardrail are installed
(6) and auxiliary facility.
Further, the prefabricated side plate is made of prefabricated Z-shaped side plate and prefabricated L shape side plate, two kinds of prefabricated side plate sides
Wall is provided with tenon, and side plate bottom, which is extended, rectangular-shape side plate rib block, at the top of side plate rib block and prefabricated Z-shaped side plate
The soil nailing hole of reserved same size, the prefabricated also reserved auxiliary outer strut slot in Z-shaped side plate top.
The prefabricated assembled lateral intralamellar part reserves grouting channel, is provided with vertical prestressed reinforcement in grouting channel
And post-grouting occluding body, vertical prestressed reinforcement bottom end and junction steel plate anchor, and are provided with reinforced hole on junction steel plate.
It is provided with length adjustment device on the oblique auxiliary outer strut and horizontal internal overarm support, wherein horizontal internal overarm support
One end is connect with prefabricated assembled lateral plate, and the other end is connected with the screw shell of U-shaped steel hoop on former barricade, U-shaped steel hoop
It is hingedly formed by three blocks of steel plates, is anchored at the top of former barricade by bolt.
The bottom junction steel plate that the cast-in-place concrete bottom parts vertical reinforcement passes through prefabricated assembled lateral plate is tied up
It pricks, it is identical as prefabricated side plate top mark height to pour rear top mark height.
The described cellular concrete backfill layer and top delay and are provided with waterproof geotextiles, inner transverse between slag backfill layer
Reinforced mesh one end is connect with prefabricated assembled lateral plate, and the other end is fixed by mesh sheet soil nailing.
The present invention have the characteristics that it is following and the utility model has the advantages that
(1) prefabricated assembled lateral plate of the present invention can be lifted directly, substantially compared to cast-in-place Retaining wall efficiency
It improves, and two sides are respectively arranged with oblique auxiliary outer strut and horizontal internal overarm support, improves in constructing and work rear stability, and pass through
The junction steel plate and cast-in-place bottom plate of bottom setting are reinforced connecting, and can further improve the intensity of new roadbed.
(2) construction of cast-in-place concrete bottom plate directlys adopt prefabricated side plate as template in the present invention, simplifies construction work
Sequence, while the cushion block as prefabricated assembled lateral plate, lateral plate can still be such that underplate concrete pours to prefabricated side plate after installing again
Sufficiently, there is preferable technical benefits.
(3) the interface side slope of Central Plains roadbed of the present invention and new roadbed is set as step-like, and new roadbed mainly uses bubble
Concrete backfill, and it is respectively provided with reinforced mesh at every layer of step when back-filling in layers, effectively improve new and old roadbed binding site
Detailed description of the invention
Fig. 1 is roadbed widening structural schematic diagram；
Fig. 2 is the lateral plate installation top view of assembled before cast-in-place construction of bottom plates；
Fig. 3 is A-A sectional view in Fig. 2.
In figure: 1- central partition；2- car lane；3- street lamp；The prefabricated lamp holder of 4-；5- non-motorized lane；6- guardrail；7-
Ecological grass mat slope protection；8- anchor bolt；The prefabricated assembled lateral plate of 9-；10- post-grouting occluding body；11- vertical prestressed reinforcement；12-
Slag of delaying backfills layer；13- waterproof geotextiles；14- mesh sheet soil nailing；15- transverse steel mesh sheet；16- cellular concrete backfills layer；17-U
Shape steel hoop；18- bolt；19- original barricade；The horizontal internal overarm support of 20-；The oblique auxiliary outer strut of 21-；22- outer strut regulating device；
23- cast-in-place concrete bottom plate；The prefabricated Z-shaped side plate of 24-；25- side plate soil nailing；The original place 26- table；27- side plate rib block；28- solidified earth
Layer；29- inner support post adjustment mechanism；30- screw shell；The prefabricated L shape side plate of 31-；32- junction steel plate；33- reinforced hole；34- coagulation
Native base tub.
Fig. 1 is roadbed widening structural schematic diagram, and Fig. 2 is the lateral plate installation top view of assembled before cast-in-place construction of bottom plates, Fig. 3
It is A-A sectional view in Fig. 2.Referring to roadbed widening structure shown in the drawings, mainly by prefabricated side plate, prefabricated assembled lateral plate 9,
The compositions such as cast-in-place concrete bottom plate 23, cellular concrete backfill layer 16.
The interface side slope of former roadbed and new roadbed is set as step-like, and prefabricated side plate is set to cast-in-place concrete base tub
34 two sides, it is fixed by side plate soil nailing 25 and lower curing soil layer 28 and original place table 26；Prefabricated assembled lateral plate 9 is set to side
On rib of slab block 27, two sides are respectively arranged with oblique auxiliary outer strut 21 and horizontal internal overarm support 20, are internally provided with vertical prestressing
Reinforcing bar 11, lower part are provided with junction steel plate 32；New roadbed backfill layer delays slag backfill layer 12 by top and lower part cellular concrete returns
Packing course 16 forms, and cellular concrete, which backfills, is arranged transverse steel mesh sheet 15 at step in layer 16.
Prefabricated side plate is made of prefabricated Z-shaped side plate 24 and prefabricated L shape side plate 31, and two kinds of prefabricated side plate side walls are provided with convex
Tenon, side plate bottom, which is extended, rectangular-shape rib block, the soil of the reserved same size of rib block and 24 top of prefabricated Z-shaped side plate
Nail hole, the prefabricated Z-shaped also reserved auxiliary outer strut slot in 24 top of side plate.
Prefabricated assembled 9 internal reservation grouting channel of lateral plate, be provided in grouting channel vertical prestressed reinforcement 11 and
Post-grouting occluding body 10,11 bottom end of vertical prestressed reinforcement and junction steel plate 32 anchor, and are provided with reinforced hole on junction steel plate 32
Outer strut regulating device 22 is provided in oblique auxiliary outer strut 21；Internal overarm support tune is provided on horizontal internal overarm support 20
Regulating device 29.Horizontal 20 one end of internal overarm support is connect with prefabricated assembled lateral plate 9, U-shaped steel hoop on the other end and former barricade 19
17 screw shell 30 is connected, and U-shaped steel hoop 17 is hingedly formed by three blocks of steel plates, is anchored at the top of former barricade 19 by bolt.
The bottom junction steel plate 32 that 23 part vertical reinforcement of cast-in-place concrete bottom plate passes through prefabricated assembled lateral plate 9 is tied up
It pricks, it is identical as prefabricated side plate top mark height to pour rear top mark height.
Cellular concrete backfill layer 16 and top delay slag backfill layer 12 between be provided with waterproof geotextiles 13, inner transverse
15 one end of reinforced mesh is connect with prefabricated assembled lateral plate 9, and the other end is fixed by mesh sheet soil nailing 14.
Before construction, excavation finishing first is carried out to former roadbed, the fertile soil of former road bed is removed, manually or mechanically in original
The interface of roadbed and the new roadbed that will be laid with modifies out step-like side slope, and the width of step is not less than 100mm, and height does not surpass
Cross 300mm.After slope trimming, according to design drawing in new roadbed and original place table handover region, manually or mechanically excavated along slope
Backfill after soil body mix slag portland firming agent for soil is paved and is compacted, forms the solidification soil layer of thickness 1200mm by the soil body
After solidification soil layer has maintained, wide 1000mm, depth 500mm are excavated out solidifying 28 top of soil layer according to design drawing
Concrete bottom board slot 34 installs prefabricated side plate after notch finishing, installs prefabricated L shape side plate 31, the other side close to original 19 side of barricade
Prefabricated Z-shaped side plate 24 is installed, two kinds of side plate height are 550mm, and thickness is 50mm, and bottom width is 200mm, and rib block length is
300mm, wherein 24 top width of prefabricated Z-shaped side plate is 300mm, the rib block end part aligning of both sides side plate bottom extended segment is simultaneously after installation
It is close to, while soil nailing is installed and is fixed.
Before prefabricated assembled lateral plate 9 is installed, U-shaped steel hoop 17, U-shaped steel hoop 17 are installed at the top of former barricade 19 in advance
It is customized according to former barricade top dimension, is anchored using M6 type expansion bolt, in 17 one side of U-shaped steel hoop is welded according to design drawing
The screw shell 30 of diameter 20mm.Then the prefabricated assembled lateral plate 9 of high 2000mm, wide 200mm are lifted to pre- using crane
On side plate rib block 27 processed, its verticality is kept by the oblique auxiliary outer strut 21 and horizontal internal overarm support 20 of installing diameter 20mm,
Then in the vertical preformed hole of lateral board diameter 30mm install diameter 15mm HRB335 vertical prestressed reinforcement 11, reinforcing bar with
Timely tensioning after bottom junction steel plate 32 anchors, and M7.5 mortar is perfused, then 11 upper end of vertical prestressed reinforcement is anchored.
After prefabricated assembled lateral plate 9 is installed, baseplate reinforcing bar is bound according to design requirement, part vertical reinforcement passes through prefabricated
The lateral 9 bottom junction steel plate 32 of plate of assembled, binding completion after-pouring C30 concrete to designed elevation, and conserve.
New roadbed uses density rating for 800kg/m3Cellular concrete back-filling in layers, often fill level-one step be laid with one
For layer transverse steel mesh sheet 15 until prefabricated assembled lateral plate top mark is high, transverse steel mesh sheet 15 is fixed using mesh sheet soil nailing 14.
Then slag backfill of delaying is carried out, is laid with waterproof geotextiles 13 in cellular concrete backfill 16 top surface of layer in advance before slag of delaying backfill, then return
It is filled to designed elevation, and in the pre-buried prefabricated lamp holder 3 of design position, slag of delaying backfills 12 side slope of layer and is laid with ecological grass mat.
After the completion of above-mentioned construction, road surfacing is carried out according to design requirement, and the auxiliary facilities such as street lamp 3, guardrail 6 are installed.
A kind of roadbed widening structure provided by the invention is described in detail above.The explanation of specific embodiment is
It is used to help understand method and its core concept of the invention.It should be pointed out that coming for those skilled in the art
It says, without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention, these improvement and modification
It also falls within the protection scope of the claims of the present invention.