Composite reinforced soil retaining wall suitable for high-speed railway embankment and construction method

Abstract

The application discloses a kind of composite reinforced soil retaining wall suitable for high-speed railway embankment and construction method, its retaining wall includes bed surface layer, bed bottom layer, bed bottom layer below embankment body, first soil body is filled in the both sides of bed bottom layer, second soil body is filled in the both sides of embankment body below bed bottom layer, first soil body, second soil body outside is provided with filler package, gravel package, and cast-in-place concrete panel is provided outside gravel package, and integral panel is provided outside cast-in-place concrete panel;Its construction method includes the following steps: construction gravel cushion, concrete leveling layer, strip foundation;According to the order from bottom to top, embankment body below bed bottom layer is constructed layer by layer;According to the order from bottom to top, bed bottom layer is constructed layer by layer;Integral panel is made and installed;Cast-in-place concrete layer, prestressed steel tendon is tensioned;Construction bed surface layer.The application is economical, and the influence on environment is reduced.The application reduces construction steps, and speeds up construction progress.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of railway subgrade structure construction, and particularly relates to a composite reinforced soil retaining wall suitable for high-speed railway embankments and a construction method. BACKGROUND

[0002] Traditional reinforced soil retaining walls are overall composite structures composed of fill, reinforcing bars and face plates, and are favored by engineering and technical personnel due to their advantages such as simple construction, wide applicability and good seismic performance. Since the introduction of reinforced technology in the 1970s, it has been widely used in many engineering fields, but it has not been applied to high-speed railway main lines. The main reason is that the traditional reinforced soil retaining wall is not obvious in controlling the deformation of the subgrade filler, and the reinforcing bars often need a certain strain to exhibit their tensile properties.

[0003] However, the allowable range of subgrade deformation of high-speed railways is in the millimeter level, so more stringent requirements are put forward for the reinforced soil retaining wall.

[0004] Therefore, there is an urgent need to develop a new type of composite reinforced soil embankment retaining wall to simultaneously solve the stability and deformation requirements of the embankment. SUMMARY

[0005] The present application is proposed to solve the problems existing in the prior art, and the purpose is to provide a composite reinforced soil retaining wall suitable for high-speed railway embankments and a construction method.

[0006] The technical scheme of the present application is: a composite reinforced soil retaining wall suitable for high-speed railway embankments, comprising a base surface layer, a base bottom layer, and an embankment body below the base bottom layer, the base bottom layer is filled with a first soil body on both sides, the embankment body below the base bottom layer is filled with a second soil body on both sides, a filler wrapping body is arranged outside the first soil body and the second soil body, a gravel wrapping body is arranged outside the filler wrapping body, a cast-in-place concrete face plate is arranged outside the gravel wrapping body, and an integral face plate is arranged outside the cast-in-place concrete face plate.

[0007] Furthermore, geotechnical material reinforcing bars are arranged in the base bottom layer and the embankment body below the base bottom layer, and the geotechnical material reinforcing bars comprise full-length geotechnical material reinforcing bars and symmetrical geotechnical material reinforcing bars.

[0008] Furthermore, the full-length geotechnical material reinforcing bars are arranged in the base bottom layer, and the full-length geotechnical material reinforcing bars are arranged transversely and longitudinally.

[0009] Furthermore, the symmetrical geotechnical material reinforcing bars are arranged in the embankment body below the base bottom layer, and the symmetrical geotechnical material reinforcing bars are symmetrically arranged transversely along the embankment body below the base bottom layer.

[0010] Further, the geotechnical material reinforcing bar is wound around the gravel wrapping body and the filler wrapping body and is folded back at one end.

[0011] Further, the folded back section of the geotechnical material reinforcing bar is fixed with the main body section by a high-density polyethylene connecting rod.

[0012] Further, prestressed steel reinforcing bars are arranged in the subgrade bottom layer and the embankment body below the subgrade bottom layer, and the prestressed steel reinforcing bars are prestressed and tensioned.

[0013] Further, the integral faceplate is connected with a strip foundation, and the strip foundation is arranged on the gravel cushion layer.

[0014] Further, a slope protection platform is arranged outside the strip foundation, and the slope protection platform protects the slope toe.

[0015] A construction method of a composite reinforced soil retaining wall suitable for a high-speed railway embankment, comprising the following steps:

[0016] A. Level the site, excavate the foundation pit, and construct the gravel cushion layer, the concrete leveling layer, and the strip foundation;

[0017] B. Construct the embankment body below the subgrade bottom layer layer by layer in a bottom-up order, and arrange the prestressed steel reinforcing bars;

[0018] C. Construct the subgrade bottom layer layer by layer in a bottom-up order, and arrange the prestressed steel reinforcing bars;

[0019] D. Manufacture and install the integral faceplate;

[0020] E. Cast the concrete layer in place, tension the prestressed steel reinforcing bars, and construct the drainage ditch and the railing;

[0021] F. Construct the subgrade surface layer and compact it by using a mechanical roller.

[0022] The beneficial effects of the present application are as follows:

[0023] The present application effectively controls the lateral displacement of the reinforced soil retaining wall and the track surface settlement caused thereby by using the combination of the integral faceplate and the prestressed steel reinforcing bar, so that the reinforced soil retaining wall can meet the millimeter-level settlement control standard of the high-speed railway subgrade.

[0024] The structural form of the present application reduces the land occupation and the use of subgrade fillers of the embankment project, is economical, and reduces the impact on the environment.

[0025] The integral faceplate of the present application increases the structural displacement deformation control capability, and the faceplate itself is prefabricated and installed, can be used as a formwork for the cast-in-place layer, reduces the construction steps, and speeds up the construction progress. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 Fig. 1 is a schematic diagram of the cross section of the present application;

[0027] Fig. 2 Fig. 2 is a schematic diagram of the structure of the filler package of the present application;

[0028] Fig. 3 Fig. 3 is a schematic diagram of the connection of the high-density polyethylene connecting rod of the present application;

[0029] Fig. 4 Fig. 4 is a schematic diagram of the structure of the monolithic panel of the present application;

[0030] wherein:

[0031] 1 base bed surface layer 2 base bed bottom layer

[0032] 3 base bed bottom embankment body 4 geotechnical material tensile reinforcement

[0033] 5 prestressed steel tensile reinforcement 6 monolithic panel

[0034] 7 slope protection platform 8 gravel cushion

[0035] 9 cast-in-place concrete panel 10 first soil body

[0036] 11 gravel package 12 filler package

[0037] 13 second soil body 14 PVC drainage pipe

[0038] 15 water-resisting layer 16 strip foundation

[0039] 17 concrete leveling layer 18 backfill tamped soil

[0040] 19 high-density polyethylene connecting rod 20 drainage ditch

[0041] 21 column 22 weep hole

[0042] 23 reserved steel tensile reinforcement connecting hole. DETAILED DESCRIPTION

[0043] Hereinafter, the present application will be described in detail with reference to the accompanying drawings and examples:

[0044] As Figs. 1 to 4As shown, a composite reinforced soil retaining wall suitable for high-speed railway embankment, comprising a base surface layer 1, a base bottom layer 2, an embankment body below the base bottom layer 3, the base bottom layer 2 is filled with a first soil body 10 on both sides, the embankment body below the base bottom layer 3 is filled with a second soil body 13 on both sides, the first soil body 10 and the second soil body 13 are provided with a filler wrapping body 12 outside, the filler wrapping body 12 is provided with a gravel wrapping body 11 outside, the gravel wrapping body 11 is provided with a cast-in-place concrete panel 9 outside, and the cast-in-place concrete panel 9 is provided with an integral panel 6 outside.

[0045] The base bottom layer 2 and the embankment body below the base bottom layer 3 are provided with geotechnical material reinforcing bars 4, and the geotechnical material reinforcing bars 4 include full-length geotechnical material reinforcing bars and symmetrical geotechnical material reinforcing bars.

[0046] The full-length geotechnical material reinforcing bars are arranged in the base bottom layer 2, and the full-length geotechnical material reinforcing bars are arranged transversely and longitudinally.

[0047] The symmetrical geotechnical material reinforcing bars are arranged in the embankment body below the base bottom layer 3, and the symmetrical geotechnical material reinforcing bars are transversely symmetrical along the embankment body below the base bottom layer 3.

[0048] One end of the geotechnical material reinforcing bar 4 is wound around the gravel wrapping body 11 and the filler wrapping body 12 and is folded back.

[0049] The folded-back section of the geotechnical material reinforcing bar 4 is fixed between the main section by a high-density polyethylene connecting rod 19.

[0050] The base bottom layer 2 and the embankment body below the base bottom layer 3 are provided with prestressed steel reinforcing bars 5, and the prestressed steel reinforcing bars 5 are prestressed and tensioned.

[0051] The lower end of the integral panel 6 is connected to a strip foundation 16, and the strip foundation 16 is arranged on the gravel cushion layer 8.

[0052] The strip foundation 16 is provided with a slope protection platform 7, and the slope protection platform 7 protects the slope toe.

[0053] Specifically, the base surface layer 1 uses 0.4m thick graded gravel, the base bottom layer 2 uses A and B group soil, and the embankment body below the base bottom layer 3 uses A, B, C1 and C2 group soil.

[0054] Specifically, the first soil body 10 is A and B group soil mixed with 5% cement, and the second soil body 13 is A, B, C1 and C2 group soil mixed with 5% cement. The first soil body 10 and the second soil body 13 are arranged within a range of 2m close to the integral panel 6.

[0055] Specifically, the base surface layer 1, the base bottom layer 2, the embankment body below the base bottom layer 3, the first soil body 10, the second soil body 13, the geotechnical material reinforcing bar 4, the prestressed steel reinforcing bar 5, the cast-in-place concrete panel 9, and the integral panel 6 constitute the main body of the embankment.

[0056] Specifically, the geotechnical material reinforcing bar 4 is arranged at equal intervals, the vertical interval of the geotechnical material reinforcing bar 4 is 0.3 m, the geotechnical material reinforcing bar 4 is arranged throughout the base bottom layer 2 and symmetrically arranged in the embankment body below the base bottom layer 3, and the length is 7 m; the geotechnical material reinforcing bar 4 has a folding length of not less than 2.5 m and is connected by a high-density polyethylene connecting rod 19.

[0057] Specifically, the prestressed steel reinforcing bar 5 is arranged throughout the cross-sectional direction, the prestressed steel reinforcing bar 5 is pre-buried during the embankment filling process, and prestressed tensioning is performed after the integral panel 6 and the cast-in-place concrete panel 9 are installed.

[0058] Specifically, the integral panel 6 is a prefabricated reinforced concrete panel, the integral panel 6 can be used as a formwork for the cast-in-place concrete panel 9, and the integral panel 6 is reliably connected with the underlying strip foundation 16.

[0059] Specifically, the cast-in-place concrete panel 9 is provided with a gravel wrapping body 11 and a filler wrapping body 12 behind it, and the gravel wrapping body 12 adopts a bagged sand and pebble inverse filter layer.

[0060] Specifically, the strip foundation 16 is made of plain concrete, and the strip foundation 16 is provided with a 0.1 m concrete leveling layer 18 and a 0.2 m thick gravel cushion 8 below, the backfilling and tamping soil 18 in the excavation range, and a expansion joint is arranged along the line direction.

[0061] Specifically, the strip foundation 16 is provided with a slope protection platform 7 above, the width of the slope protection platform 7 is 1.5 m, and the slope ratio is 1:1.5. A PVC drainage pipe 14 is arranged along the line direction at 1 m above the sidewalk, and a waterproof layer 15 is arranged below the PVC drainage pipe 14.

[0062] Specifically, a drainage ditch 20 is arranged along the line longitudinal direction at the toe of the base surface layer 1.

[0063] Specifically, a railing 21 is arranged at the top position behind the cast-in-place concrete panel 9.

[0064] Specifically, the integral panel 6 and the cast-in-place concrete panel 9 are arranged inwardly inclined.

[0065] Specifically, the upper end of the strip foundation 16 forms a protrusion that limits the horizontal freedom degree of the lower end of the inclined integral panel 6.

[0066] A construction method of a composite reinforced soil retaining wall suitable for high-speed railway embankments, comprising the following steps:

[0067] A. Level the site, excavate the foundation pit, and construct the gravel cushion 8, the concrete leveling layer 17, and the strip foundation 16;

[0068] B. Construct the embankment body 3 below the base layer in layers from bottom to top, and lay the prestressed steel reinforcement 5;

[0069] C. Construct the base layer 2 in layers from bottom to top, and lay the prestressed steel reinforcement 5;

[0070] D. Manufacture and install the monolithic panel 6;

[0071] E. Cast the concrete layer 9, tension the prestressed steel reinforcement 5, and construct the drainage ditch 20 and the railing 21;

[0072] F. Construct the surface layer 1 of the base using mechanical rolling and compaction.

[0073] Specifically, in step A, the site is leveled, the foundation pit is excavated, and the gravel cushion 8, the concrete leveling layer 17, and the strip foundation 16 are constructed. The other positions of the foundation pit are backfilled with tamped soil 18 and compacted.

[0074] Specifically, in step B, the embankment body 3 below the base layer is constructed in layers from bottom to top, and the prestressed steel reinforcement 5 is laid. The specific process is as follows:

[0075] First, the embankment body 3 below the base layer is constructed in layers from bottom to top, with each layer having a filling thickness of not greater than 0.3 m;

[0076] Then, during construction, the gravel wrapping body 11 and the filler wrapping body 12 are first laid. The wrapping bodies are wrapped and counter-wrapped with the geotechnical material reinforcement 4, with a backfolding length of not less than 2.5 m;

[0077] Next, the geotechnical material reinforcement 4 is connected using high-density polyethylene connecting rods 19;

[0078] Next, within a range of 2.0 m behind the filler wrapping body 12, the second soil body 13 is filled, and the remaining positions are filled with A, B, C1, and C2 group soils;

[0079] Next, after mechanical rolling and compaction, the next layer can be constructed;

[0080] Finally, during filling, the prestressed steel reinforcement 5 is arranged at the designed position.

[0081] Specifically, in step C, the base layer 2 is constructed in layers from bottom to top, and the prestressed steel reinforcement 5 is laid. The specific process is as follows:

[0082] First, the base layer 2 is constructed layer by layer in the order from bottom to top, and the filling thickness of each layer is not greater than 0.3m;

[0083] Then, during the construction process, the gravel wrapping body 11 and the filler wrapping body 12 are first laid, the wrapping body is wrapped and back-packed by the geotechnical material reinforcing rib 4, and the backfolding length is not less than 2.5m;

[0084] Then, the geotechnical material reinforcing rib 4 is connected by the high-density polyethylene connecting rod 19;

[0085] Then, the first soil body 10 is filled within a range of 2.0m behind the filler wrapping body 12, and the rest is filled by the A and B groups of soil;

[0086] Then, after being compacted by a mechanical roller, the upper layer can be constructed;

[0087] Finally, during the filling process, the prestressed steel reinforcing rib 5 is arranged at the designed position.

[0088] Specifically, the step D is to manufacture and install the integral panel 6, and the specific process is as follows:

[0089] First, the integral panel 6 is manufactured, and the integral panel 6 is installed outside the gravel wrapping body 11 after reaching the designed strength;

[0090] Then, the integral panel 6 is used as a formwork to construct the cast-in-place concrete layer 9.

[0091] Specifically, the step E is to cast the concrete layer 9, tension the prestressed steel reinforcing rib 5, and construct the drainage ditch 20 and the railing 21, and the specific process is as follows:

[0092] First, the prestressed steel reinforcing rib 5 is tensioned and locked after the cast-in-place concrete layer 9 reaches the designed strength;

[0093] Then, the drainage ditch 20 and the railing 21 are constructed.

[0094] The integral panel and the prestressed steel reinforcing rib are combined in the present application, which effectively controls the lateral displacement of the reinforced soil retaining wall and the track surface settlement caused thereby, so that the reinforced soil retaining wall can meet the millimeter-level settlement control standard of high-speed railway subgrade.

[0095] The structure form of the present application reduces the land occupation and the use of subgrade filler of the embankment project, has good economy, and reduces the influence on the environment.

[0096] The integral panel of the present application increases the structural displacement deformation control capability, and the panel itself is prefabricated and installed, can be used as a formwork of the cast-in-place layer, reduces the construction steps, and speeds up the construction progress.

Claims

1. A composite reinforced soil retaining wall suitable for high-speed railway embankment, comprising a base surface layer (1), a base bottom layer (2), and an embankment body (3) below the base bottom layer, characterized in that: The base layer (2) is filled with a first soil body (10) on both sides, the embankment body (3) is filled with a second soil body (13) on both sides, the first soil body (10) and the second soil body (13) are provided with a filler wrapping body (12) outside, the filler wrapping body (12) is provided with a gravel wrapping body (11) outside, the gravel wrapping body (11) is provided with a cast-in-place concrete panel (9) outside, and the cast-in-place concrete panel (9) is provided with an integral panel (6) outside. The base layer (2) and the embankment body (3) are provided with a geotechnical material tensile reinforcement (4), and the geotechnical material tensile reinforcement (4) comprises a full-length geotechnical material tensile reinforcement and a symmetrical geotechnical material tensile reinforcement. The base layer (2) and the embankment body (3) are provided with a prestressed steel tensile reinforcement (5), and the prestressed steel tensile reinforcement (5) is prestressed and tensioned. The prestressed steel tensile reinforcement (5) is arranged along the transverse direction, and the prestressed steel tensile reinforcement (5) is embedded during the embankment filling process and is prestressed and tensioned after the integral panel (6) and the cast-in-place concrete panel (9) are installed. The integral panel (6) is a prefabricated reinforced concrete panel, and the integral panel (6) serves as a formwork for the cast-in-place concrete panel (9).

2. The composite reinforced soil retaining wall suitable for high-speed railway embankment according to claim 1, characterized in that: The full-length geotechnical material tensile reinforcement is arranged in the base layer (2) and is arranged transversely and longitudinally.

3. The composite reinforced soil retaining wall suitable for high-speed railway embankment according to claim 1, characterized in that: The symmetrical geotechnical material tensile reinforcement is arranged in the embankment body (3) below the base layer and is symmetrical transversely along the embankment body (3) below the base layer.

4. The composite reinforced soil retaining wall suitable for high-speed railway embankment according to claim 1, characterized in that: One end of the geotechnical material tensile reinforcement (4) is wound around the gravel wrapping body (11) and the filler wrapping body (12) and is folded back.

5. The composite reinforced soil retaining wall suitable for high-speed railway embankment according to claim 4, characterized in that: The folded-back section of the geotechnical material tensile reinforcement (4) is fixed to the main section by a high-density polyethylene connecting rod (19).

6. The composite reinforced soil retaining wall suitable for high-speed railway embankment according to claim 1, characterized in that: The lower end of the integral panel (6) is connected to a strip foundation (16), and the strip foundation (16) is arranged on the gravel cushion (8).

7. The composite reinforced soil retaining wall suitable for high-speed railway embankment according to claim 6, characterized in that: The strip foundation (16) is provided with a slope protection platform (7), and the slope protection platform (7) protects the slope toe.

8. The construction method of a composite reinforced soil retaining wall suitable for high-speed railway embankments according to claim 1, characterized in that: The steps include: A. Level the site, excavate the foundation pit, and construct the gravel cushion (8), the concrete leveling layer (17), and the strip foundation (16); B. Construct the embankment body (3) below the base layer layer by layer in the order from bottom to top, and arrange the prestressed steel tensile reinforcement (5); C. Construct the base layer (2) layer by layer in the order from bottom to top, and arrange the prestressed steel tensile reinforcement (5); D. Manufacture and install the integral panel (6); E. Form the cast-in-place concrete panel (9) by casting in place, tension the prestressed steel tensile reinforcement (5), construct the drainage ditch (20) and the railing (21); F. Construct the base surface layer (1) by mechanical rolling and compaction.

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