CN115450250B - Reinforced cement stabilized macadam retaining wall structure and construction method - Google Patents
Reinforced cement stabilized macadam retaining wall structure and construction method Download PDFInfo
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- CN115450250B CN115450250B CN202211273294.6A CN202211273294A CN115450250B CN 115450250 B CN115450250 B CN 115450250B CN 202211273294 A CN202211273294 A CN 202211273294A CN 115450250 B CN115450250 B CN 115450250B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0283—Retaining or protecting walls characterised by constructional features of mixed type
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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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
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Abstract
The invention discloses an enhanced cement stabilized macadam retaining wall structure and a construction method, which belong to the technical field of supporting and retaining structure design in geotechnical engineering, and are particularly suitable for side slopes, foundation pit supporting and retaining wall structures and construction when the height difference exists between adjacent building to be built and the upper building and the lower building need to be constructed simultaneously; according to the invention, the polypropylene three-way grid carbon fiber structure net is added into the retaining wall structure taking the cement stabilized macadam as the main raw material, and the anchor bars are utilized to anchor the polypropylene three-way grid carbon fiber structure net, so that the shearing resistance of the cement stabilized macadam can be enhanced, the deformation resistance of the retaining wall can be improved, and meanwhile, the three-way grid carbon fiber net is added into the bottom layer of the foundation, so that the integral shearing damage of the foundation is expanded towards the deep layer, the bearing capacity of the foundation is improved, the shallow foundation is more stable, and the uneven settlement is effectively reduced. The method can solve the problems of high cost, lower bearing capacity of the foundation, weaker deformation resistance of the retaining wall structure and the like of the existing vertical supporting structure.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering side slope and foundation pit support design, in particular to a side slope and foundation pit support retaining wall structure and a construction method which are applicable to the condition that a nearby building has a height difference and an upper building and a lower building need to be simultaneously constructed, and the side slope and foundation pit support retaining wall structure and the construction method are collectively called as an enhanced cement stabilized macadam retaining wall structure and a construction method.
Background
The cement stabilized macadam is a structural layer formed by stirring and paving sand, macadam, cement and water in a specific proportion and compacting and curing the sand, the macadam and the cement in the optimal water content, has high bearing capacity, good water stability, low cost and high mechanical utilization, and is widely applied to a base layer of road engineering. However, the cement stabilized macadam has lower tensile and shear strength, and if the cement stabilized macadam is independently used as a soil retaining member, the cement stabilized macadam mainly bears shear stress under the action of soil pressure, and cracks and even slumps are easily formed, so that property and personal safety are caused.
In the side slope support in the prior geotechnical engineering, the retaining wall structure mainly comprises a grouted block stone retaining wall and a concrete retaining wall, and the labor investment is excessive in the construction process of the two structures, and the cost is high; meanwhile, the retaining wall is used as a structure for bearing active soil pressure, the retaining wall can play a role after certain displacement generally occurs in the traditional retaining wall, and certain control on deformation and displacement is needed in actual engineering, in particular to slopes and foundation pits with important buildings and structures on the tops of the slopes and with higher safety levels.
The existing cantilever type vertical supporting measures have poor deformation resistance, and in order to enhance the deformation resistance, anchoring or internal supporting is usually needed, so that the cost is high, and the construction period is long.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, namely high cost of the existing vertical supporting structure, low mechanical utilization of the construction of the retaining wall and weak deformation resistance of the retaining wall, and provides a reinforced cement stabilized macadam retaining wall structure and a construction method.
The aim of the invention is achieved by the following technical scheme: a reinforced cement stabilized macadam retaining wall structure and a construction method thereof comprise a broken stone layer, a concrete foundation, anchors, drainage channels, fiber net reinforcing sheets, reinforcing steel bars, anchor bars and a concrete surface layer; the concrete foundation is arranged on the foundation below the slope bottom, the gravel layer is arranged on the concrete foundation, the concrete surface layer is arranged on the gravel layer, the water channel is arranged in the concrete surface layer, the fiber net and the reinforcing sheet are arranged in the concrete surface layer, and the reinforcing steel bars and the anchor bars are arranged at the rear of the concrete surface layer. Wherein, as the preference, the gravel layer sets up to cement stabilization gravel layer, the anchor sets up to long anchor, the drainage channel sets up to graded rubble drainage channel, the carbon fiber net sets up to three-way grid carbon fiber net, the reinforcement sets up to rubber reinforcement, the reinforcing bar sets up to three-way grid carbon fiber net reinforcing bar, the anchor bar sets up to the reinforcing bar anchor bar. The concrete foundation is arranged on the foundation below the slope bottom, the cement stabilized gravel layer is arranged on the concrete foundation, the concrete surface layer is arranged on the cement stabilized gravel layer, the graded broken stone drainage channel is arranged in the concrete surface layer, the three-way grid carbon fiber net and the rubber reinforcing sheet are arranged in the concrete surface layer, and the three-way grid carbon fiber net reinforcing steel bars and the steel anchor bars are arranged at the rear of the concrete surface layer.
Preferably, a three-way grid carbon fiber net is arranged at the bottom of the concrete foundation, and long anchors are vertically arranged to penetrate through the concrete foundation anchoring foundation and the polypropylene three-way grid carbon fiber net.
Preferably, three-way grid carbon fiber network reinforcing steel bars are arranged on the rear side of the three-way grid carbon fiber network, and are connected with the steel bar anchor bars with threads through rigid hinges with sleeves and hole threads in a bolt mode.
Preferably, the top of the three-way grille carbon fiber net is fixed by an upper rubber reinforcing sheet, a lower rubber reinforcing sheet and a vertical long anchor nail, which are coated with silicone structural sealant, and a short rivet, wherein the short rivet is arranged between the upper rubber reinforcing sheet and the lower rubber reinforcing sheet.
Preferably, the long anchor is made of common screw thread steel, and the short rivet is made of common smooth round steel bar or bamboo nail.
Preferably, the steel bar anchor bar is finish rolled screw thread steel or common screw thread steel, the end head is provided with screw threads, and the steel bar anchor bar and the rigid hinge are fastened through a backing plate and a nut and then are sealed by anchor sealing concrete pouring.
Preferably, a centering bracket is arranged on the outer side of the steel bar anchor bar, and a grouting pipe is arranged on the outer side of the centering bracket.
Preferably, the rigid hinge is provided in two parts, wherein the first part is provided as an insertion piece connected with the reinforcing steel bar, the second part is provided in a fork shape connected with the anchor bar, and the first part is inserted into the second part and is not hinged through the two parts by bolts.
The invention also provides a construction method of the reinforced cement stabilized macadam structure, which is characterized in that the bottom of the foundation is a polypropylene three-way grid carbon fiber net, the upper part is a concrete foundation, vertical rivets penetrate through the concrete foundation to anchor the foundation and the polypropylene three-way grid carbon fiber net, the main material of the retaining wall is cement stabilized macadam, the cement stabilized macadam is formed by layering and rolling, the interlayer bonding surface is fixedly connected through the reverse wrapping lap joint of the polypropylene three-way grid carbon fiber net and the rivet anchoring and embedding, the horizontal direction of the cement stabilized macadam layer is provided with graded macadam drainage channels in a segmented mode, and the temporary surface is sprayed with a concrete protection surface layer; the method comprises the following steps:
(1) Paying off: excavating temporary side slopes and retaining wall foundation grooves, performing foundation trench inspection, spraying a temporary concrete surface layer and pouring a concrete cushion layer;
(2) And (3) positioning a drilling machine: mechanically drilling holes on the temporary excavation surface, placing anchor bars, grouting, and carrying out tensile test and detection after the curing period is reached;
(3) Laying a polypropylene three-way grid carbon fiber structural net, fixedly connecting reinforcing steel bars with anchor bars through bolts and rigid hinges, and sealing anchor heads by using anchor sealing concrete;
(4) Driving in foundation rivets, reserving upper lap joint steel bars, and pouring a concrete foundation;
(5) Supporting a temporary side template, arranging a rubber baffle, reversely wrapping a polypropylene three-way grid carbon fiber structural net, tightly attaching the rubber baffle, and paving cement stabilized macadam with graded cement dosage of 3% -5%;
(6) Paving proper amount of graded broken stone in a synchronous layered and segmented mode in the step (5) to serve as a natural drainage channel in the later period;
(7) Using a vibratory roller, and rolling cement stabilized macadam when the water content of the steel wheel roller and the tyre roller is at or slightly greater than the optimal water content;
(8) A polypropylene three-way grille carbon fiber structure net is reversely wrapped to half of the width of the retaining wall, and a rubber reinforcing layer is paved at the lower part of the polypropylene three-way grille carbon fiber structure net;
(9) Repeating the step (3) until the upper polypropylene three-way grille carbon fiber structure net is paved, and paving a rubber reinforcing layer on the upper part of the polypropylene three-way grille carbon fiber structure net;
(10) Driving long rivets and short rivets and reserving overlap joint reinforcing steel bars on the upper sides of the long rivets so as to realize integral connection;
(11) Repeating the steps (3) to (10) until all layered cement stabilized macadam rolling is completed, spraying a concrete surface layer, covering with geotextile and performing watering maintenance.
Preferably, in the step (4) and the step (10), steel pipes which are difficult to drive in and can be reserved are injected in the later stage, the grouting material is cement paste, and the grouting pressure is 0.5-0.6 MPa; the anchor bar is an anchor bar with a binding centering bracket.
The invention also provides an application of the reinforced cement stabilized macadam retaining wall structure and the construction method aiming at the concrete structure and the construction method, wherein the reinforced cement stabilized macadam retaining wall structure and the construction method are used for side slopes and foundation pit supporting retaining wall structures which are close to a planned building and have a height difference when an upper building and a lower building need to be simultaneously constructed, a polypropylene three-way grid carbon fiber structure net is added into the retaining wall structure taking cement stabilized macadam as a main raw material, and meanwhile, the polypropylene three-way grid carbon fiber structure net is anchored by anchor bars so as to enhance the shearing resistance of the cement stabilized macadam and improve the deformation resistance of the retaining wall.
The invention has the following advantages:
1. the cement stabilized macadam is mainly used as a retaining wall material, is directly formed by mechanical rolling, has high compressive strength, can be suitable for side slope support with higher requirements on the bearing capacity of the slope top, and has the advantages of lower labor cost investment, high mechanical utilization degree, simple and convenient construction and cost saving;
2. the graded broken stone is used as a natural drainage channel, so that the method is green and pollution-free;
3. the three-way grid carbon fiber net is added to the foundation bottom layer, so that the whole shear damage of the foundation is extended towards the deep layer, the shear resistance is improved, the bearing capacity of the foundation is improved, the shallow foundation is more stable, and meanwhile, uneven settlement is effectively reduced;
4. in order to avoid the defect of the self shearing resistance of the cement stabilized macadam, a three-way grid carbon fiber net is paved at the interface between the cement stabilized macadam layers, and meanwhile, a reverse package and a vertical anchor bar are arranged to restrict and relieve lateral displacement, prevent cracking, improve the integrity and stability of the retaining wall and effectively enhance the shearing resistance and durability of the cement stabilized macadam retaining wall;
5. the anchor bars implanted in the back side of the wall reduce the displacement and deformation of the retaining wall and increase the reliability of the structure on the one hand and the physical and mechanical parameters of the soil body behind the wall on the other hand and strengthen the stability of the soil body behind the wall on the other hand through anchor pulling the three-way grid carbon fiber net.
Drawings
FIG. 1 is a cross-sectional view of a reinforced cement stabilized macadam structure.
FIG. 2 is a schematic plan view of a three-way grid carbon fiber mesh structure laid in the reinforced cement stabilized macadam.
FIG. 3 is a schematic illustration of the overlap and rivet construction of a three-way grid carbon fiber mesh layer block laid in an enhanced cement stabilized macadam.
FIG. 4 is a schematic view of the three-way grid carbon fiber mesh layer block reverse-wrapping structure paved in the reinforced cement stabilized macadam.
Fig. 5 is a schematic structural view of the rubber reinforcing layer.
Fig. 6 is a schematic view of the anchor bar, the anchor bar and the rigid hinge connection structure.
Fig. 7 is a schematic cross-sectional view of a grouting hole of a temporary excavation slope behind a wall.
Fig. 8 is a schematic view of a rigid hinge structure.
In the figure, the concrete comprises a 1-cement stabilized gravel layer, a 2-concrete foundation, 3-long anchors, 4-graded gravel drainage channels, 5-three-way grid carbon fiber nets, 6-rubber reinforcing sheets, 7-three-way grid carbon fiber net reinforcing steel bars, 8-steel bar anchors, 9-concrete surface layers, 10-short rivets, 11-rigid hinges, 12-nuts, 13-cement paste, 14-grouting pipes, 15-centering brackets and 16-anchor sealing concrete.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, or are directions or positional relationships conventionally understood by those skilled in the art, are merely for convenience of describing the present invention and for simplifying the description, and are not to indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the reinforced cement stabilized macadam structure and the construction method thereof shown in fig. 1 to 8, one specific structural scheme is that the retaining wall structure comprises structural components of a cement stabilized macadam layer 1, a concrete foundation 2, a long anchor 3, a graded macadam drainage channel 4, a three-way grid carbon fiber net 5, a rubber reinforcing sheet 6, a three-way grid carbon fiber net reinforcing steel bar 7, a steel bar anchor bar 8 and a concrete surface layer 9. In the invention, as shown in fig. 1, a three-way grid carbon fiber net 5 is arranged at the bottom of a concrete foundation 2, then the concrete foundation 2 is arranged on the foundation, a cement stabilized gravel layer 1 is arranged on the concrete foundation 2, a concrete surface layer 9 is arranged on the cement stabilized gravel layer 1, graded broken stone drainage channels 4 are arranged in the concrete surface layer 9, the three-way grid carbon fiber net 5 and a rubber reinforcing sheet 6 are arranged in the concrete surface layer 9, and three-way grid carbon fiber net reinforcing steel bars 7 and steel bar anchor bars 8 are arranged behind the concrete surface layer 9, thus forming the solid structure of the retaining wall.
In the invention, the retaining wall structure mainly uses cement stabilized macadam as a raw material and graded macadam as a natural drainage channel. In order to prevent the occurrence of an overall weak shear plane, the graded broken stone natural drainage channel 4 is arranged in a quincuncial shape on the vertical surface.
The three-way grille carbon fiber net 5 is paved at the interface between the cement stabilized macadam layers, as shown in figure 2, the three-way grille carbon fiber net 5 in the horizontal direction has moderate overlap length along the length extending direction of the retaining wall, the overlap joints between the upper layer and the lower layer are staggered, and the rubber reinforcing layer 6 is paved on the upper layer and the lower layer of three-way grille carbon fiber net 5 at the overlap joint position. In order to enhance the integrity, silicone structural sealant is coated between the upper and lower rubber reinforcing layers 6 laid at the lap joint. The three-way grid carbon fiber net 5 is in a regular triangle mesh shape, and the quality control tensile modulus of the integral plum blossom type carbon fiber net is equal to that of the integral plum blossom type carbon fiber net in the longitudinal direction of 0 degree, the transverse direction of 90 degrees and the oblique direction of 60 degrees.
To improve the integrity of the retaining wall while minimizing the floor space, the three-way grid carbon fiber net 5 is turned over in the direction perpendicular to the extending direction of the retaining wall and extends to half the width of the retaining wall. As shown in fig. 3 and 4, a rubber reinforcing layer 6 is respectively paved on the upper part and the lower part of the overlapped interface of the three-way grille carbon fiber net 5 reversely wrapping and the horizontal three-way grille, and as shown in fig. 5, meanwhile, vertical short rivets 10 are arranged for connection so as to enhance the integrity, the vertical short rivets 10 are driven into the rolled layer for 200-250 mm, and 200-250 mm is reserved. In order to reduce the whole displacement of the retaining wall and strengthen the shear strength of soil body behind the wall, a grouting steel bar anchor bar 8 is arranged on the rear side soil body of the three-way grille close to the temporary excavation line.
In fact, as shown in fig. 6, the three-way grille carbon fiber net 5 is provided with three-way grille carbon fiber net reinforcing ribs 7 on the soil retaining side, the three-way grille carbon fiber net reinforcing ribs 7 are connected with anchor bars 8 through rigid hinges 11, and the vertical long anchors 3 penetrate through the concrete foundation 2 to anchor the foundation and the polypropylene three-way grille carbon fiber net 5 to anchor the foundation, the concrete foundation 2 and the three-way grille carbon fiber net 5 as a whole. The steel bar anchor bars 8 are connected with the three-way grille by adopting specific rigid hinges 11, and the steel bar anchor bars 8 can rotate 360 degrees around the rear side of the three-way grille to facilitate the connection between the steel bar anchor bars 8 and the three-way grille carbon fiber net reinforcing steel bars 7 after being driven or grouting. In order to enhance the anti-sliding capability of the cement stabilized macadam, after a first layer of three-way grid carbon fiber net 5 is paved, two rows of vertical rivets are driven into a foundation along the extension of a retaining wall, the vertical rivets are driven into the foundation by 500mm, and 200-250 mm is reserved.
In the present invention, as shown in fig. 4, the three-way grid carbon fiber net 5 comprises a bottom layer part 5-1, a temporary side turn-up part 5-2 and a top layer turn-up part 5-3, wherein round rubber reinforcing sheets 7 are respectively arranged on the upper part and the lower part of the top layer turn-up lap joint part 5-3, and are fixed by a vertical long rivet 3 and a short rivet 10.
In the invention, as shown in fig. 7, the outlet side of a steel bar anchor bar 8 with a centering bracket 15 is provided with threads, the outlet side of the steel bar anchor bar is connected with a rigid hinge 11 with a threaded hole through a nut 12 through a bolt, the centering bracket 15 is arranged on the outer side of the steel bar anchor bar 8, a grouting pipe 14 is arranged on the outer side of the centering bracket 15, and the steel bar anchor bar is closed by anchor sealing concrete in the later stage. The holes provided with the steel bar anchor bars 8 are filled and fixed by cement slurry 13 poured through grouting pipes 14. The face side is sprayed with a concrete surface layer 9.
In the present invention, there is provided a specific rigid hinge 11 as shown in fig. 8, the rigid hinge 11 being provided in two parts, wherein the first part is provided as an insertion piece, and is connected with the reinforcing steel bar 7; the second part is fork-shaped and is connected to the anchor bar 8, the first part being inserted into the second part and being not hinged by means of the two parts by means of bolts.
The invention provides a concrete construction method to the structure, wherein the bottom of the foundation is paved by adopting a polypropylene three-way grid carbon fiber net, the upper part of the foundation is a concrete foundation, vertical rivets penetrate through the concrete foundation to anchor the foundation and the polypropylene three-way grid carbon fiber net, the main material of the retaining wall is cement stabilized macadam, the retaining wall is formed by layering rolling, the interlayer bonding surface is fixedly connected by reversely wrapping and overlapping the polypropylene three-way grid carbon fiber net and anchoring and embedding the rivets, the cement stabilized macadam layer is provided with graded macadam drainage channels in a horizontal direction in a segmented manner, and the temporary surface is sprayed with concrete to protect the surface layer; the method comprises the following steps:
(1) Paying off: excavating temporary side slopes and retaining wall foundation grooves, performing foundation trench inspection, spraying a temporary concrete surface layer and pouring a concrete cushion layer;
(2) And (3) positioning a drilling machine: mechanically drilling holes on the temporary excavation surface, placing anchor bars, grouting, and carrying out tensile test and detection after the curing period is reached;
(3) Laying a polypropylene three-way grid carbon fiber structural net, fixedly connecting a reinforcing rib with an anchor rib through bolts and a rigid hinge, and sealing an anchor head by using anchor sealing concrete;
(4) Driving in foundation rivets, reserving upper lap joint steel bars, and pouring a concrete foundation;
(5) Supporting a temporary side template, arranging a rubber baffle, reversely wrapping a polypropylene three-way grid carbon fiber structural net, tightly attaching the rubber baffle, and paving cement stabilized macadam with graded cement dosage of 3% -5%;
(6) Paving proper amount of graded broken stone in a synchronous layered and segmented mode in the step (5) to serve as a natural drainage channel in the later period;
(7) Using a vibratory roller, and rolling cement stabilized macadam when the water content of the steel wheel roller and the tyre roller is at or slightly greater than the optimal water content;
(8) A polypropylene three-way grille carbon fiber structure net is reversely wrapped to half of the width of the retaining wall, and a rubber reinforcing layer is paved at the lower part of the polypropylene three-way grille carbon fiber structure net;
(9) Repeating the step (3) until the upper polypropylene three-way grille carbon fiber structure net is paved, and paving a rubber reinforcing layer on the upper part of the polypropylene three-way grille carbon fiber structure net;
(10) Driving long rivets and short rivets and reserving overlap joint reinforcing steel bars on the upper sides of the long rivets so as to realize integral connection;
(11) Repeating the steps (3) to (10) until all layered cement stabilized macadam rolling is completed, spraying a concrete surface layer, covering with geotextile and performing watering maintenance.
In the construction steps (4) and (10), steel pipes can be reserved when rivets are difficult to drive in, grouting is performed in the later stage, grouting materials are cement paste, and grouting pressure is 0.5-0.6 MPa; the anchor bar is an anchor bar with a binding centering bracket.
During construction, the long anchor 3 is made of common threaded steel, the short rivet 10 is made of common smooth round steel bars or bamboo nails, the steel bar anchor bar 8 is made of finish rolled threaded steel or common threaded steel, and the end head is provided with threads. The steel bar anchor bar 8 and the rigid hinge 11 are fastened through the backing plate and the nuts, and then the anchor sealing concrete 16 is poured and sealed.
The main body structure and the construction method are used for side slope and foundation pit supporting retaining wall structures which have height differences and are used for simultaneously constructing upper and lower buildings when the building is close to a planned building, the retaining wall structure which takes cement stabilized macadam as a main raw material is added with a polypropylene three-way grid carbon fiber structure net, and meanwhile, the anchor bars are utilized to anchor the polypropylene three-way grid carbon fiber structure net so as to enhance the shearing resistance of the cement stabilized macadam and improve the deformation resistance of the retaining wall.
The cement stabilized macadam is rolled in a layering manner to form, and a polypropylene three-way grid carbon fiber structural net is paved on the interlayer joint surface of the bottom of the foundation and the cement stabilized macadam, so that the integral shearing damage surface of the foundation is deeply expanded, the bearing capacity of the foundation is improved, the shallow foundation is more stable, the shearing resistance is improved, and meanwhile uneven settlement is effectively reduced; by adopting measures such as anti-wrapping and lap joint of the adjacent side and the top layer of the polypropylene three-way grid carbon fiber structural net, combining with the guarantee of construction procedures, paving two round rubber sheets on the upper part and the lower part of the lap joint weak layer, fixedly connecting the two round rubber sheets by vertical rivets, reserving an upper anchoring part, guaranteeing the connection reinforcement of the weak part of the interlayer bonding surface, realizing the integrity of the retaining wall structure, preventing cracking to a great extent and avoiding the shearing deformation of the retaining wall structure; the anchor bar anchor-pulled polypropylene three-way grid carbon fiber structural net after grouting is utilized, so that on one hand, the displacement and deformation of the retaining wall are reduced, the reliability of the structure is improved, on the other hand, the physical and mechanical parameters of soil bodies behind the wall are also improved, and the overall stability is enhanced.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (10)
1. The utility model provides a reinforced cement stabilized macadam barricade structure which characterized in that: the concrete surface layer comprises a cement stable gravel layer (1), a concrete foundation (2), long anchors (3), graded gravel drainage channels (4), a three-way grid carbon fiber net (5), rubber reinforcing sheets (6), three-way grid carbon fiber net reinforcing steel bars (7), steel bar anchor bars (8) and a concrete surface layer (9); set up concrete foundation (2) on the foundation under the slope bottom, set up cement stabilization gravel layer (1) on concrete foundation (2), set up concrete surface course (9) on cement stabilization gravel layer (1), set up gradation rubble drainage channel (4) in concrete surface course (9), be provided with three-way grid carbon fiber net (5) and rubber reinforcement piece (6) in concrete surface course (9), set up three-way grid carbon fiber net reinforcing bar (7) and reinforcing bar anchor bar (8) at the rear of concrete surface course (9).
2. The reinforced cement stabilized macadam structure of claim 1, wherein: the bottom of the concrete foundation (2) is provided with a three-way grid carbon fiber net (5), and long anchors (3) vertically penetrate through the concrete foundation (2) to anchor the foundation and the polypropylene three-way grid carbon fiber net (5).
3. The reinforced cement stabilized macadam structure of claim 2, wherein: the three-way grid carbon fiber net reinforcing steel bars (7) are arranged on the rear side of the three-way grid carbon fiber net (5), and the three-way grid carbon fiber net reinforcing steel bars (7) are connected with the steel bar anchor bars (8) with threads through rigid hinges (11) with sleeves and hole threads.
4. A reinforced cement stabilized macadam structure as claimed in claim 3, wherein: the top of three-dimensional grid carbon fiber net (5) is turned over and is wrapped the part and fix through upper and lower rubber reinforcement piece (6) and vertical long anchor nail (3) and short rivet (10) that scribble silicone structure sealant, and short rivet (10) set up between upper and lower rubber reinforcement piece (6).
5. The reinforced cement stabilized macadam structure of claim 4, wherein: the long anchor nail (3) is made of common screw thread steel, and the short rivet (10) is made of common smooth round steel bars or bamboo nails.
6. The reinforced cement stabilized macadam structure of claim 1, wherein: the steel bar anchor bar (8) is finish rolled screw thread steel or common screw thread steel, the end head is provided with screw threads, and the steel bar anchor bar (8) and the rigid hinge (11) are fastened through a backing plate and a nut and then are sealed by casting anchor sealing concrete (16).
7. The reinforced cement stabilized macadam structure of claim 1, wherein: a centering bracket (15) is arranged on the outer side of the steel bar anchor bar (8), and a grouting pipe (14) is arranged on the outer side of the centering bracket (15).
8. The method for constructing a reinforced cement stabilized macadam structure of claim 1, wherein: the bottom of the foundation is a polypropylene three-way grid carbon fiber net, the upper part of the foundation is a concrete foundation, vertical rivets penetrate through the concrete foundation to anchor the foundation and the polypropylene three-way grid carbon fiber net, the main material of the retaining wall is cement stabilized macadam, the retaining wall is formed by layering and rolling, the interlayer bonding surfaces are fixedly connected through anti-wrapping lap joint and rivet anchoring and embedding of the polypropylene three-way grid carbon fiber net, graded macadam drainage channels are arranged in a sectional manner in the horizontal direction of the cement stabilized macadam layer, and the temporary surface is sprayed with a concrete protection surface layer; the method comprises the following steps:
(1) Paying off: excavating temporary side slopes and retaining wall foundation grooves, performing foundation trench inspection, spraying a temporary concrete surface layer and pouring a concrete cushion layer;
(2) And (3) positioning a drilling machine: mechanically drilling holes on the temporary excavation surface, placing anchor bars, grouting, and carrying out tensile test and detection after the curing period is reached;
(3) Laying a polypropylene three-way grid carbon fiber structural net, fixedly connecting a reinforcing rib with an anchor rib through bolts and a rigid hinge, and sealing an anchor head by using anchor sealing concrete;
(4) Driving in foundation rivets, reserving upper lap joint steel bars, and pouring a concrete foundation;
(5) Supporting a temporary side template, arranging a rubber baffle, reversely wrapping a polypropylene three-way grid carbon fiber structural net, tightly attaching the rubber baffle, and paving cement stabilized macadam with graded cement dosage of 3% -5%;
(6) Paving proper amount of graded broken stone in a synchronous layered and segmented mode in the step (5) to serve as a natural drainage channel in the later period;
(7) Using a vibratory roller, and rolling cement stabilized macadam when the water content of the steel wheel roller and the tyre roller is at or slightly greater than the optimal water content;
(8) A polypropylene three-way grille carbon fiber structure net is reversely wrapped to half of the width of the retaining wall, and a rubber reinforcing layer is paved at the lower part of the polypropylene three-way grille carbon fiber structure net;
(9) Repeating the step (3) until the upper polypropylene three-way grille carbon fiber structure net is paved, and paving a rubber reinforcing layer on the upper part of the polypropylene three-way grille carbon fiber structure net;
(10) Driving long rivets and short rivets and reserving overlap joint reinforcing steel bars on the upper sides of the long rivets so as to realize integral connection;
(11) Repeating the steps (3) to (10) until all layered cement stabilized macadam rolling is completed, spraying a concrete surface layer, covering with geotextile and performing watering maintenance.
9. The method for constructing a reinforced cement stabilized macadam structure of claim 8, wherein: in the step (4) and the step (10), steel pipes which are difficult to drive in and can be reserved are injected in later stages, the grouting material is cement paste, and the grouting pressure is 0.5-0.6 MPa; the anchor bar is an anchor bar with a binding centering bracket.
10. An application of an enhanced cement stabilized macadam retaining wall structure and a construction method is characterized in that: the structure and the construction method are used for slope and foundation pit supporting retaining wall structures when the elevation difference exists near the planned building and the upper and lower buildings are required to be simultaneously constructed, the retaining wall structure taking cement stabilized macadam as a main raw material is added with a polypropylene three-way grid carbon fiber structure net, and meanwhile, the anchor bars are utilized to anchor the polypropylene three-way grid carbon fiber structure net so as to enhance the shearing resistance of the cement stabilized macadam and improve the deformation resistance of the retaining wall.
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