A method for reconstruction and expansion of existing roads and three-sided steel sheet pile cofferdam used therein

Abstract

The invention discloses a method for reconstruction and expansion of an existing road and a three-sided steel sheet pile cofferdam used therein, comprising the following steps: S1: constructing a bridge pile foundation, a cap and a pier body in sequence on the side of the original embankment slope to be widened; S2: constructing a three-sided steel sheet pile cofferdam on the side of the bridge close to the original embankment slope to be widened; S3: backfilling and compacting the embankment filling outside the three-sided steel sheet pile cofferdam, completing the connection between the ground layer widened embankment and the asymmetric side steel sheet piles of the three-sided steel sheet pile cofferdam; S4: backfilling and compacting the embankment filling inside the three-sided steel sheet pile cofferdam, and removing the symmetrical side steel sheet piles on both sides of the three-sided steel sheet pile cofferdam; S5: pulling out the asymmetric side steel sheet piles at the embankment widening slope and pouring concrete into the cavity to complete the embankment slope widening construction. The invention designs a three-sided steel sheet pile cofferdam in combination with the characteristics of the embankment slope, and adopts a method of first constructing the bridge foundation and then carrying out the embankment filling construction, thereby reducing the backfill volume and saving the construction period.

Description

Technical Field

[0001] The present invention relates to the technical field of steel sheet pile cofferdam construction at the widening of road embankments, and more specifically, to a method for reconstruction and expansion of an existing road and a three-sided steel sheet pile cofferdam used therein. Background Art

[0002] Steel sheet piles are a type of steel structure with linkage devices on the edges that can be freely combined to form a continuous and tight retaining wall or water retaining wall.

[0003] In the reconstruction project of building a new three-dimensional layer + expanding the ground layer, the three-dimensional bridge foundation is located on the slope of the widened embankment. In order to ensure the compaction quality of the widened embankment and avoid the bias pressure on the bridge foundation caused by the filling construction, the embankment is usually constructed first, and then the traditional steel sheet pile cofferdam is constructed. After the embankment is excavated and filled, the bridge foundation is constructed, and the steel sheet piles are pulled out after the foundation pit is backfilled. After backfilling the embankment, this method needs to be excavated and backfilled, which has redundant construction steps and a large amount of material waste. At the same time, the roadbed needs to be constructed first, which affects the construction period of the key bridge line and causes a long total project construction period. Summary of the invention

[0004] The purpose of the present invention is to provide a method for reconstruction and expansion of an existing road and a three-sided steel sheet pile cofferdam used therein. In combination with the characteristics of the embankment slope, the three-sided steel sheet pile cofferdam is designed, and a method of first constructing a bridge foundation and then carrying out embankment filling construction is adopted to reduce the backfill volume and save construction time.

[0005] The technical solution adopted by the present invention to solve this technical problem is: to provide a method for reconstruction and expansion of an existing road, comprising the following steps:

[0006] S1: construct the bridge pile foundation, cap and pier in sequence on the side of the original embankment slope to be widened;

[0007] S2: construct a three-sided steel sheet pile cofferdam on the side of the bridge close to the original embankment slope to be widened;

[0008] S3: Backfill and compact the outer embankment of the three-sided steel sheet pile cofferdam to complete the connection between the ground layer widened embankment and the asymmetric side steel sheet piles of the three-sided steel sheet pile cofferdam;

[0009] S4: Backfill and compact the embankment fill inside the three-sided steel sheet pile cofferdam, and remove the symmetrical side steel sheet piles on both sides of the three-sided steel sheet pile cofferdam;

[0010] S5: Pull out the asymmetric side steel sheet piles at the embankment widening slope and pour concrete into the cavity to complete the embankment slope widening construction.

[0011] Preferably, in the method for reconstruction and expansion of an existing road, in step S2, the three-sided steel sheet pile cofferdam includes two symmetrical side steel sheet piles arranged before and after the bridge pedestal and an asymmetric side steel sheet pile arranged on the side of the original embankment slope to be widened, the symmetrical side steel sheet piles are double-sided clamping purlins, and the asymmetric side steel sheet piles are single-sided purlins.

[0012] The present invention also provides a three-sided steel sheet pile cofferdam for implementing the above-mentioned method for reconstruction and expansion of an existing road, comprising: two symmetrically arranged double-sided clamped purlins and a single-sided purlin vertically connecting the two double-sided clamped purlins;

[0013] The double-sided clamped purlin is composed of an inner purlin, an outer purlin, and a first steel sheet pile arranged between the inner purlin and the outer purlin. The single-sided purlin is composed of a first purlin vertically connecting one end of two inner purlins and a second steel sheet pile arranged outside the first purlin. The other ends of the two inner purlins are connected by a butt brace.

[0014] A steel pipe pile is arranged at the end of the first steel sheet pile, and a diagonal brace is arranged at the bottom of the steel pipe pile.

[0015] Preferably, in the three-sided steel sheet pile cofferdam, the inner purlin and the outer purlin are connected by a tie rod, and the tie rod includes a plurality of tie rods and clamping plates;

[0016] The first steel sheet pile is provided with a plurality of holes, through which the tie rods pass, and the plurality of tie rods are respectively arranged on the upper and lower sides of the inner and outer purlins, and the two clamping plates respectively abut against the outer sides of the inner and outer purlins and vertically connect the upper and lower tie rods.

[0017] Preferably, in the three-sided steel sheet pile cofferdam, the inner and outer purlins are connected to the first steel sheet piles via corbels;

[0018] The corbel includes a transverse plate which is arranged at the lower side of the inner and outer purlins and one end of which is connected to the first steel sheet pile, and an inclined plate which connects the transverse plate and the first steel sheet pile.

[0019] Preferably, in the three-sided steel sheet pile cofferdam, the steel pipe piles and the inner and outer purlins are connected via a connecting assembly, and the connecting assembly includes a top plate, top plate stiffening ribs and a slide groove;

[0020] The top plate is connected to the steel pipe piles by welding. A slide groove is arranged on the top plate, which is used to support the ends of the inner and outer purlins. The cross section of the slide groove is C-shaped with an opening facing upward. A plurality of top plate stiffening ribs are arranged between the steel pipe piles and the top plate.

[0021] Preferably, in the three-sided steel sheet pile cofferdam, the diagonal braces and the steel pipe piles are pressed against each other via a support plate, the surface of the support plate is an arc shape fitting the outer surface of the steel pipe piles, and a plurality of support plate stiffening ribs are provided between the diagonal braces and the support plate.

[0022] Preferably, in the three-sided steel sheet pile cofferdam, the steel pipe piles are connected to the first steel sheet piles via a steel sheet pile joint, and the steel pipe piles are connected to the steel sheet pile joint via a double-sided fillet weld.

[0023] Preferably, in the three-sided steel sheet pile cofferdam, the inner purlin and the first purlin are connected via an angle slide-type casing;

[0024] The cross section of the corner sliding groove sleeve is L-shaped, and the inner wall fits the lower side and the outer side of the inner surrounding purlin and the first surrounding purlin.

[0025] Preferably, in the three-sided steel sheet pile cofferdam, the inner purlin, the outer purlin and the first purlin are all composed of steel segments of different lengths, and flanges are provided at the ends of the steel segments, and the flanges are fixed by bolts.

[0026] The present invention has at least the following beneficial effects:

[0027] 1. In the construction of bridge foundation at the slope of widened embankment, the present invention realizes the application of three-sided steel cofferdam, avoids repeated excavation and filling operations of the embankment, and ensures the compaction quality of the embankment.

[0028] 2. The present invention realizes the process of first building the bridge foundation and then widening the embankment during the construction of the bridge foundation at the slope of the widened embankment. Compared with the traditional method of first building the embankment and then building the bridge, it has positive significance for shortening the total construction period of the project.

[0029] 3. In the present invention, the straight section of the cofferdam purlin is flange-connected, and sleeves are used at the corners, which can meet the requirements of cofferdams of various sizes, can be used cyclically, has good economic benefits, and is highly versatile.

[0030] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A construction schematic diagram of step S1 in a method for reconstruction and expansion of an existing road;

[0032] Figure 2 A construction schematic diagram of step S2 in a method for reconstruction and expansion of an existing road;

[0033] Figure 3 A construction schematic diagram of step S3 in a method for reconstruction and expansion of an existing road;

[0034] Figure 4 A construction schematic diagram of step S4 in a method for reconstruction and expansion of an existing road;

[0035] Figure 5 A construction schematic diagram of step S5 in a method for reconstruction and expansion of an existing road;

[0036] Figure 6 This is a structural schematic diagram of a three-sided steel sheet pile cofferdam;

[0037] Figure 7 This is a top view detail of the double-sided clamped purlin in the three-sided steel sheet pile cofferdam;

[0038] Figure 8 This is the main detail view of the double-side clamped purlin in the three-sided steel sheet pile cofferdam;

[0039] Fig. 9 This is a side view detail of the double-side clamped purlin in the three-sided steel sheet pile cofferdam;

[0040] Fig.10 It is a top view structural schematic diagram of the connection components in the three-sided steel sheet pile cofferdam;

[0041] Fig.11 This is a detailed view of the connection between the chute and the purlin in the three-sided steel sheet pile cofferdam;

[0042] Fig.12 It is a schematic diagram of the main structure of the connection components in the three-sided steel sheet pile cofferdam;

[0043] Fig.13 This is a top view detail of the connection between the diagonal brace and the steel pipe piles in the three-sided steel sheet pile cofferdam;

[0044] Fig.14 This is a front view detail diagram of the connection between the diagonal brace and the steel pipe piles in the three-sided steel sheet pile cofferdam;

[0045] Fig.15 A detailed view of the connection between the steel pipe pile and the first steel sheet pile in the three-sided steel sheet pile cofferdam;

[0046] Fig.16 This is a detailed view of the connection between the corner sliding groove type casing and the surrounding purlin in the three-sided steel sheet pile cofferdam;

[0047] Fig.17 This is a detailed view of the connection between the inner purlin and the first purlin in the three-sided steel sheet pile cofferdam;

[0048] Fig.18 This is a detailed view of the connection between the steel segments of the purlin in the three-sided steel sheet pile cofferdam;

[0049] Description of reference numerals: 1, pile foundation, 2, cap, 3, pier body, 4, original embankment, 5, three-sided steel sheet pile cofferdam, 51, double-sided clamped purlin, 511, inner purlin, 512, outer purlin, 513, first steel sheet pile, 52, single-sided purlin, 521, first purlin, 522, second steel sheet pile, 6, brace, 7, steel pipe pile, 8, diagonal brace, 9, tie rod, 91, tie rod, 92, Pallet, 10. Connection assembly, 101. Slide, 102. Top plate, 103. Top plate stiffening rib, 11. Corner slide sleeve, 12. Corbel, 121. Cross plate, 122. Inclined plate, 13. Support plate, 14. Support plate stiffening rib, 15. Steel sheet pile joint, 16. Corner weld, 17. Steel segment, 18. Flange, 19. Bolt, 20. Outer embankment fill, 21. Inner embankment fill. DETAILED DESCRIPTION

[0050] The present invention is described in detail and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly pointed out that the technical solutions and technical features provided in each part of the present invention, including the following description, can be combined with each other without conflict.

[0051] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0052] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, and its specific implementation process is as follows:

[0053] like Figure 1-5 As shown, the present invention provides a method for reconstruction and expansion of an existing road, comprising the following steps:

[0054] S1: construct the bridge pile foundation 1, the cap 2 and the pier 3 in sequence on the side of the original embankment 4 slope to be widened;

[0055] S2: construct a three-sided steel sheet pile cofferdam 5 on the side of the bridge close to the original embankment 4 slope to be widened;

[0056] S3: Backfill and compact the outer embankment fill 20 of the three-sided steel sheet pile cofferdam 5 to complete the connection between the ground layer widened embankment and the asymmetric side steel sheet piles of the three-sided steel sheet pile cofferdam 5;

[0057] S4: backfill and compact the embankment fill 21 inside the three-sided steel sheet pile cofferdam 5, and remove the symmetrical side steel sheet piles on both sides of the three-sided steel sheet pile cofferdam 5;

[0058] S5: Pull out the asymmetric side steel sheet piles at the embankment widening slope and pour concrete into the cavity to complete the embankment slope widening construction.

[0059] The above construction method is adopted to ensure that when the three-sided steel sheet pile cofferdam 5 is close to the foundation of the bridge pedestal 2, the backfill compaction of the embankment will not cause squeezing effect on the bridge foundation.

[0060] Furthermore, in the method for reconstruction and expansion of an existing road, in step S2, the three-sided steel sheet pile cofferdam 5 includes two symmetrical side steel sheet piles arranged in front and behind the bridge pedestal 2 and asymmetric side steel sheet piles arranged on the side of the slope of the original embankment 4 to be widened, the symmetrical side steel sheet piles are double-sided clamping purlins 51, and the asymmetric side steel sheet piles are single-sided purlins 52.

[0061] like Figure 6-18 As shown, the present invention also provides a three-sided steel sheet pile cofferdam for implementing a reconstruction and expansion method of an existing road, comprising: two symmetrically arranged double-sided clamped purlins 51 and a single-sided purlin 52 vertically connecting the two double-sided clamped purlins 51;

[0062] The double-sided clamped purlin 51 is composed of an inner purlin 511, an outer purlin 512, and a first steel sheet pile 513 arranged between the inner purlin 511 and the outer purlin 512. The single-sided purlin 52 is composed of a first purlin 521 vertically connecting one end of the two inner purlins 511 and a second steel sheet pile 522 arranged outside the first purlin 521. The other ends of the two inner purlins 511 are connected by a brace 6.

[0063] A steel pipe pile 7 is disposed at the end of the first steel sheet pile 513 , and a diagonal brace 8 is disposed at the bottom of the steel pipe pile 7 .

[0064] Steel pipe piles 7 are used at both ends of the three-sided steel sheet pile cofferdam 5 and diagonal braces 8 are arranged to connect the steel pipe piles 7. At the same time, double-sided clamping purlins 51 are arranged to ensure the stability of axial force transmission on the sides of the three-sided steel sheet pile cofferdam 5.

[0065] Furthermore, in the three-sided steel sheet pile cofferdam, the inner purlin 511 and the outer purlin 512 are connected by a tie rod 9, and the tie rod 9 includes a plurality of tie rods 91 and a clamping plate 92;

[0066] The first steel sheet pile 513 is provided with a plurality of holes, through which the tie rods 91 pass. The plurality of tie rods 91 are respectively provided on the upper and lower sides of the inner purlin 511 and the outer purlin 512. The two clamping plates 92 respectively abut against the outer sides of the inner purlin 511 and the outer purlin 512 and vertically connect the upper and lower tie rods 91.

[0067] In this embodiment, a preferred implementation scheme is that a notch is provided on the clamping plate 92 for the pull rod 91 to pass through, and two pull rods 91 are provided on the upper side and the lower side of the cofferdam.

[0068] Furthermore, in the three-sided steel sheet pile cofferdam, the inner purlin 511 and the outer purlin 512 are connected with the first steel sheet pile 513 via a corbel 12;

[0069] The corbel 12 includes a transverse plate 121 which is arranged at the lower side of the inner purlin 511 and the outer purlin 512 and connected to the first steel sheet pile 513 at one end, and an inclined plate 122 which connects the transverse plate 121 and the first steel sheet pile 513 .

[0070] Furthermore, in the three-sided steel sheet pile cofferdam, the steel pipe piles 7 are connected to the inner purlin 511 and the outer purlin 512 via a connecting assembly 10, and the connecting assembly 10 includes a top plate 102, a top plate stiffening rib 103 and a slide chute 101;

[0071] The top plate 102 is connected to the steel pipe piles 7 by welding. A slide groove 101 is provided on the top plate 102. The slide groove 101 is used to support the ends of the inner purlin 511 and the outer purlin 512. The cross-section of the slide groove 101 is C-shaped with an opening facing upward. A plurality of top plate stiffening ribs 103 are provided between the steel pipe piles 7 and the top plate 102.

[0072] Furthermore, in the three-sided steel sheet pile cofferdam, the diagonal brace 8 and the steel pipe pile 7 are pressed against each other by a support plate 13, the surface of the support plate 13 is an arc shape that fits the outer surface of the steel pipe pile 7, and a plurality of support plate stiffening ribs 14 are arranged between the diagonal brace 8 and the support plate 13. There are two support plates 13, which are arranged on both sides of the diagonal brace 8 respectively.

[0073] Furthermore, in the three-sided steel sheet pile cofferdam, the steel pipe piles 7 are connected to the first steel sheet piles 513 via a steel sheet pile joint 15, and the steel pipe piles 7 are connected to the steel sheet pile joint 15 via a double-sided fillet weld 16, and can withstand forces and moments in various directions.

[0074] Furthermore, in the three-sided steel sheet pile cofferdam, the inner purlin 511 and the first purlin 521 are connected via an angle slide-type casing 11;

[0075] The corner slide groove sleeve 11 has an L-shaped cross section, and the inner wall fits the lower side and outer side of the inner purlin 511 and the first purlin 521. The corner slide groove sleeve 11 can strengthen the connection of the purlin at the corner and improve the assembly and installation effect of the purlin.

[0076] Furthermore, in the three-sided steel sheet pile cofferdam, the inner purlin 511, the outer purlin 512 and the first purlin 521 are all composed of steel segments 17 of different lengths. The ends of the steel segments 17 are provided with flanges 18, and the flanges 18 are fixed to each other by bolts 19, so that the three-sided steel sheet pile cofferdam 5 can be adapted to a variety of sizes.

[0077] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A method for reconstruction and expansion of an existing road, characterized in that: The steps include: S1: construct the bridge pile foundation, cap and pier in sequence on the side of the original embankment slope to be widened; S2: construct a three-sided steel sheet pile cofferdam on the side of the bridge close to the original embankment slope to be widened; S3: Backfill and compact the outer embankment of the three-sided steel sheet pile cofferdam to complete the connection between the ground layer widened embankment and the asymmetric side steel sheet piles of the three-sided steel sheet pile cofferdam; S4: Backfill and compact the embankment fill inside the three-sided steel sheet pile cofferdam, and remove the symmetrical side steel sheet piles on both sides of the three-sided steel sheet pile cofferdam; S5: Pull out the asymmetric side steel sheet piles at the embankment widening slope and pour concrete into the cavity to complete the embankment slope widening construction.

2. The method for reconstruction and expansion of an existing road as claimed in claim 1, characterized in that: In step S2, the three-sided steel sheet pile cofferdam includes two symmetrical side steel sheet piles arranged before and after the bridge pedestal and an asymmetric side steel sheet pile arranged on the side of the original embankment slope to be widened. The symmetrical side steel sheet piles are double-sided clamped purlins, and the asymmetric side steel sheet piles are single-sided purlins.

3. The method for reconstruction and expansion of an existing road as claimed in claim 1, characterized in that: In the step S2, the three-sided steel sheet pile cofferdam includes: two symmetrically arranged double-sided clamped purlins and a single-sided purlin vertically connecting the two double-sided clamped purlins; The double-sided clamped purlin is composed of an inner purlin, an outer purlin, and a first steel sheet pile arranged between the inner purlin and the outer purlin. The single-sided purlin is composed of a first purlin vertically connecting one end of two inner purlins and a second steel sheet pile arranged outside the first purlin. The other ends of the two inner purlins are connected by a butt brace. A steel pipe pile is arranged at the end of the first steel sheet pile, and a diagonal brace is arranged at the bottom of the steel pipe pile.

4. The method for reconstruction and expansion of an existing road as claimed in claim 3, characterized in that: The inner purlin is connected to the outer purlin by a tie rod, and the tie rod comprises a plurality of tie rods and a clamping plate; The first steel sheet pile is provided with a plurality of holes, through which the tie rods pass, and the plurality of tie rods are respectively arranged on the upper and lower sides of the inner and outer purlins, and the two clamping plates respectively abut against the outer sides of the inner and outer purlins and vertically connect the upper and lower tie rods.

5. The method for reconstruction and expansion of an existing road as claimed in claim 3, characterized in that: The inner and outer purlins are connected to the first steel sheet piles via corbels; The corbel includes a transverse plate which is arranged at the lower side of the inner and outer purlins and one end of which is connected to the first steel sheet pile, and an inclined plate which connects the transverse plate and the first steel sheet pile.

6. The method for reconstruction and expansion of an existing road as claimed in claim 3, characterized in that: The steel pipe piles are connected to the inner and outer purlins via a connecting assembly, and the connecting assembly includes a top plate, top plate stiffening ribs and a slide groove; The top plate is connected to the steel pipe piles by welding. A slide groove is arranged on the top plate, which is used to support the ends of the inner and outer purlins. The cross section of the slide groove is C-shaped with an opening facing upward. A plurality of top plate stiffening ribs are arranged between the steel pipe piles and the top plate.

7. The method for reconstruction and expansion of an existing road as claimed in claim 3, characterized in that: The diagonal brace is pressed against the steel pipe pile via a supporting plate, the surface of the supporting plate is in an arc shape fitting the outer surface of the steel pipe pile, and a plurality of supporting plate stiffening ribs are arranged between the diagonal brace and the supporting plate.

8. The method for reconstruction and expansion of an existing road as claimed in claim 3, characterized in that: The steel pipe pile is connected to the first steel sheet pile via a steel sheet pile joint, and the steel pipe pile is connected to the steel sheet pile joint via a double-sided fillet weld.

9. The method for reconstruction and expansion of an existing road as claimed in claim 3, characterized in that: The inner perimeter purlin is connected to the first perimeter purlin via an angled sliding groove sleeve; The cross section of the corner sliding groove sleeve is L-shaped, and the inner wall fits the lower side and the outer side of the inner surrounding purlin and the first surrounding purlin.

10. The method for reconstruction and expansion of an existing road as claimed in claim 3, characterized in that: The inner perimeter purlin, the outer perimeter purlin and the first perimeter purlin are all composed of steel segments of different lengths. Flanges are arranged at the ends of the steel segments, and the flanges are fixed to each other by bolts.

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