CN106835877B - The construction method of roadbed widening structure - Google Patents

The construction method of roadbed widening structure Download PDF

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Publication number
CN106835877B
CN106835877B CN201710041723.XA CN201710041723A CN106835877B CN 106835877 B CN106835877 B CN 106835877B CN 201710041723 A CN201710041723 A CN 201710041723A CN 106835877 B CN106835877 B CN 106835877B
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plate
prefabricated
construction
layer
roadbed
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CN106835877A (en
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马松涛
石利军
刘长勇
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Xi'an City Municipal Architecture (Group) Co., Ltd.
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XI'AN CITY MUNICIPAL ARCHITECTURE (GROUP) CO Ltd
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00Foundations for pavings

Abstract

It is main comprising steps of former road excavation finishing, the construction of solidification soil layer, solidification soil layer construction, prefabricated assembled lateral plate construction, the construction of cast-in-place concrete construction of bottom plates, cellular concrete backfill layer, slag of delaying backfill layer construction and road surface and mating setting construction the present invention relates to a kind of construction method of roadbed widening structure.The present invention, which not only increases the fixed effect between new roadbed and former roadbed and is connected, agrees with intensity, also enhances the intensity and roadbed side slope stability of new roadbed.

Description

The construction method of roadbed widening structure
Technical field
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.
Background technique
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 Crack.
(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 Foundation stability.
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.
Specific embodiment
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 33。
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 28。
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.

Claims (6)

1. a kind of construction method of roadbed widening structure, which is characterized in that the roadbed widening structure includes prefabricated side plate, prefabricated The lateral plate of assembled (9), cast-in-place concrete bottom plate (23) and bubble concrete backfill layer (16);The boundary of former roadbed and new roadbed Face side slope is set as step-like, and prefabricated side plate is set to cast-in-place concrete base tub (34) two sides, by side plate soil nailing (25) with Lower curing soil layer (28) and original place table (26) are fixed;Prefabricated assembled lateral plate (9) is set on side plate rib block (27), two sides It is respectively arranged with oblique auxiliary outer strut (21) and horizontal internal overarm support (20), is internally provided with vertical prestressed reinforcement (11), under Portion 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: the fertile soil of former road bed is removed first, in former roadbed and the new road that will be laid with The interface of base modifies out step-like side slope;
Step 2: solidification soil layer construction: in new roadbed and original place table handover region, the soil body is manually or mechanically excavated, the soil body is mixed Backfill paves and is compacted after closing soil-solidified-agent, forms solidification soil layer (28);
Step 3: concrete bottom board slot first prefabricated side plate installation: is excavated out on solidification soil layer (28) top according to design drawing (34), prefabricated side plate is installed after notch finishing, prefabricated L shape side plate (31) is installed close to original barricade (19) side, other side installation is pre- It makes 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: it prefabricated assembled lateral plate construction: before prefabricated assembled lateral plate (9) installation, is pushed up in advance in former barricade (19) U-shaped steel hoop (17) are installed in portion, then are lifted prefabricated assembled lateral plate (9) to prefabricated side plate rib block (27) using crane, Verticality is kept by installing oblique auxiliary outer strut (21) and horizontal internal overarm support (20), is subsequently mounted vertical prestressed reinforcement (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 prefabricated dress With the lateral plate of formula (9) bottom junction steel plate (32), 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 level-one step and is laid with one layer 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 with anti-water and soil in cellular concrete backfill layer (16) top surface in advance Work cloth (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 and 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 (6) are installed And auxiliary facility.
2. construction method according to claim 1, it is characterised in that the prefabricated side plate by prefabricated Z-shaped side plate (24) and Prefabricated L shape side plate (31) composition, two kinds of prefabricated side plate side walls are provided with tenon, and side plate bottom, which is extended, rectangular-shape The soil nailing hole of reserved same size, prefabricated Z-shaped side plate (24) at the top of side plate rib block, side plate rib block and prefabricated Z-shaped side plate (24) The also reserved auxiliary outer strut slot in top.
3. construction method according to claim 1, it is characterised in that prefabricated assembled lateral plate (9) internal reservation Grouting channel is provided with vertical prestressed reinforcement (11) and post-grouting occluding body (10), vertical prestressed reinforcement in grouting channel (11) bottom end and junction steel plate (32) anchor, and are provided with reinforced hole (33) on junction steel plate (32).
4. construction method according to claim 1, it is characterised in that in the oblique auxiliary outer strut (21) and level Strut is provided with length adjustment device on (20), wherein horizontal internal overarm support (20) one end and prefabricated assembled lateral plate (9) are even It connects, the other end is connected with the screw shell (30) of U-shaped steel hoop (17) on former barricade (19), and U-shaped steel hoop (17) is by three blocks of steel Plate hingedly forms, and is anchored at the top of former barricade (19) by bolt.
5. construction method according to claim 1, it is characterised in that cast-in-place concrete bottom plate (23) part is vertical The bottom junction steel plate (32) that reinforcing bar passes through prefabricated assembled lateral plate (9) is bound, and pours rear top mark height and prefabricated side plate top mark It is high identical.
6. construction method according to claim 1, it is characterised in that cellular concrete backfill layer (16) and top Slag of delaying backfill layer (12) between is provided with waterproof geotextiles (13), inner transverse reinforced mesh (15) one end with it is prefabricated assembled Lateral plate (9) connection, the other end are fixed by mesh sheet soil nailing (14).
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JPH045324A (en) * 1990-04-23 1992-01-09 Hakko Co Ltd Widening civil engineering work method using foaming resin
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