Roadbed widening pile-slab structure and construction method thereof

Abstract

The invention discloses a roadbed widening pile-slab structure and a construction method thereof. The connection problem of a pile plate structure, a newly-built widened roadbed and an existing road roadbed is particularly important. The connecting structure is used for connecting a newly-built widened roadbed and an existing roadbed and comprises a bearing plate, and longitudinal butt straps are arranged on the two sides of the bearing plate in the longitudinal bridge direction correspondingly; a transverse butt strap is arranged between the two longitudinal butt straps; a pile foundation is arranged below the bearing plate, and a stem slope is arranged between the bearing plate and the pile foundation; the bearing plate is connected with the newly-built widened roadbed and the existing roadbed through brackets; the longitudinal butt strap and the transverse butt strap are connected with the bracket of the bearing plate through studs; a concrete bridge floor cast-in-place layer is arranged above the bearing plate, the longitudinal butt strap and the transverse butt strap; the waterproof layer is located between the concrete bridge deck cast-in-place layer and the asphalt concrete bridge deck pavement layer. Stable connection between the newly-built widened roadbed and the existing roadbed is achieved, and the requirement for the safe distance of important pipelines when the roadbed is widened is met.

Description

Technical Field

[0001] The invention belongs to the technical field of highway and municipal road subgrades, and in particular relates to a subgrade widening pile-plate structure and a construction method thereof. Background Art

[0002] With the continuous economic development and the acceleration of urbanization, the traffic demand for highways and urban municipal roads is increasing, and people have put forward higher requirements for the comfort and convenience of travel. However, many existing roads are difficult to meet the current traffic volume and safety standards due to the limitations of technical, economic conditions and design concepts during the construction period. Therefore, the reconstruction and expansion of these roads has become an important means to solve the traffic bottleneck. In this process, the problem of roadbed widening frequently occurs, which has become a key challenge to improve road capacity and traffic conditions.

[0003] However, there are often many important pipelines buried in cities, which have strict requirements on safety distance. When widening the roadbed, directly widening the roadbed may not meet the safety distance standards of these pipelines. Therefore, the partial use of pile-board structure becomes an effective solution. In addition, the connection between the pile-board structure and the newly widened roadbed and the existing roadbed is also particularly important. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art, the present invention provides a roadbed widening pile-plate structure and a construction method thereof, so as to achieve a stable connection between the newly-built widened roadbed and the existing roadbed and meet the safety distance requirements of important pipelines when widening the roadbed.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A roadbed widening pile-slab structure, characterized in that it is used for connecting a newly-built widened roadbed with an existing roadbed, comprising a bearing plate, wherein longitudinal slabs are respectively arranged on both sides of the bearing plate along the longitudinal bridge; and a transverse slab is arranged between the two longitudinal slabs;

[0007] A pile foundation is arranged below the bearing plate, and a stem slope is arranged between the bearing plate and the pile foundation;

[0008] The bearing plate is connected to the newly-built widened roadbed and the existing roadbed through brackets; the longitudinal cladding and the transverse cladding are connected to the brackets of the bearing plate through bolts;

[0009] A cast-in-place concrete bridge deck layer is arranged above the bearing plate, the longitudinal slab and the transverse slab; and the waterproof layer is located between the cast-in-place concrete bridge deck layer and the asphalt concrete bridge deck pavement layer.

[0010] Furthermore, the pile foundations are arranged asymmetrically in the transverse direction of the bridge and symmetrically in the longitudinal direction of the bridge.

[0011] Furthermore, along the longitudinal direction of the bridge, the lower part of the inclined stem is as wide as the diameter of the pile foundation; along the transverse direction of the bridge, the length of the top part of the inclined stem is equal to the width of the bearing plate.

[0012] Furthermore, the angle between the oblique edge of the stem and the bottom of the supporting plate is less than 45 degrees.

[0013] Furthermore, half of the bolt is inserted into the longitudinal strap and the transverse strap, and the other half is inserted into the corbel.

[0014] Furthermore, a 2 cm longitudinal joint or a 1 cm vertical joint is reserved at the joints between the longitudinal lap board or the transverse lap board and the corbel, and the longitudinal joint is filled with asphalt mastic filler, and the vertical joint is provided with oil felt.

[0015] Furthermore, a layer of 10 cm thick C20 plain concrete and a 20 cm thick crushed stone cushion layer are arranged between the slab and the roadbed to ensure the stability of the connection between the longitudinal slab 5 and the transverse slab 6 and the roadbed.

[0016] A construction method for a roadbed widening pile-slab structure comprises the following steps:

[0017] Step 1: Level the site, move construction machinery into the site, insert steel sheet piles to protect the existing roadbed, and use rotary drilling to carry out pile foundation construction;

[0018] Step 2: Construction of stem tilting and bearing plate;

[0019] Step 3: Construction of longitudinal and transverse planking;

[0020] Step 4: Lay the cast-in-place concrete bridge deck layer, waterproof layer and asphalt concrete bridge deck pavement layer to complete the construction of the pile-slab structure.

[0021] Further, the step 2 is specifically as follows:

[0022] Carry out foundation treatment, set up cast-in-place support, erect formwork and tie steel bars, then cast-in-place stems and load-bearing plates, and pre-embed bolts on the load-bearing plate corbels.

[0023] Further, the step three is specifically as follows:

[0024] Pull out the steel sheet piles, slope the existing roadbed, lay plain concrete and crushed stone cushion layers under the scaffolding, fill the longitudinal joints with mastic asphalt filler, set oil felt in the vertical joints, and cast-in-place longitudinal and transverse scaffolding in formwork.

[0025] Beneficial effects of the present invention:

[0026] 1) The present invention achieves the widening of the existing roadbed and meets the safety distance requirements between the newly built structure and the important pipelines through the asymmetric arrangement of the pile foundation in the transverse direction of the bearing plate.

[0027] 2) The present invention reduces the span of the pile-plate structure by arranging a support between the pile foundation and the bearing plate, which is beneficial to reducing the bending moment of the bearing plate; the existence of the support indirectly increases the thickness of the bearing plate near the pile foundation, which helps to reduce the shear stress of the bearing plate; the support's wide top and narrow bottom form can better transmit vertical loads and horizontal loads such as automobile braking force, and the pile-plate structure has good stability, which is beneficial to high-speed driving.

[0028] 3) The present invention connects the pile-sheet structure with the roadbed structure by means of a slab, thus achieving a good transition between structures with different stiffness, effectively solving the problem of uneven settlement of the roadbed at the joint, and improving driving smoothness.

[0029] 4) The present invention eliminates the expansion joint between the pile-plate structure and the roadbed structure, thus avoiding the cost of later maintenance and replacement of the expansion joint, reducing the later maintenance cost of the structure, and having good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the planar layout of the roadbed widening pile-slab structure;

[0031] Figure 2 This is a schematic diagram of the longitudinal bridge layout of the roadbed widening pile-slab structure;

[0032] Figure 3 This is a schematic diagram of the transverse arrangement of the roadbed widening pile-slab structure;

[0033] Figure 4 Schematic diagram of the connection between the longitudinal slab or transverse slab and the bearing plate and the roadbed;

[0034] Figure 5 This is a schematic diagram of the construction of the roadbed widening pile-slab structure;

[0035] In the figure, 1. pile foundation; 2. stem inclination; 3. bearing plate; 4. corbel; 5. longitudinal scaffolding; 6. transverse scaffolding; 7. new widened roadbed; 8. existing roadbed; 9. important pipelines; 10. cast-in-place layer of concrete bridge deck; 11. waterproof layer; 12. asphalt concrete bridge deck pavement layer; 13. bolts; 14. longitudinal joints; 15. vertical joints; 16. plain concrete; 17. crushed stone cushion layer; 18. steel sheet piles; 19. cast-in-place bracket; 20. formwork. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with specific implementation modes.

[0037] The roadbed widening pile-plate structure of the present invention is used for connecting a newly-built widened roadbed 7 with an existing roadbed 8; Figure 1 As shown, the bearing plate 3 includes longitudinal plates 5 respectively arranged on both sides of the bearing plate 3 along the longitudinal bridge; a transverse plate 6 is arranged between the two longitudinal plates 5; the bearing plate of the pile-plate structure is 10m long, 6.7m wide and 0.8m thick;

[0038] like Figure 2 , 3 As shown, a pile foundation 1 is arranged below the bearing plate 3, and a pile foundation 2 is arranged between the bearing plate 3 and the pile foundation 1; the pile foundation 1 is asymmetrically arranged in the transverse direction of the bridge, L1=2.7m, L2=1.5m; the pile foundation 1 is symmetrically arranged in the longitudinal direction of the bridge, the spacing between the pile foundations 1 in the longitudinal direction of the bridge is 5.5m, and the diameter of the pile foundation 1 is 1.0m, so as to meet the safety distance requirements between the two outermost pile foundations 1 and the important pipeline 9.

[0039] Along the longitudinal direction of the bridge, the lower part of the spur 2 is the same width as the diameter of the pile foundation 1, which is 1.0m, the upper part of the spur 2 is 3.0m, and the height of the spur 2 is 0.6m; along the transverse direction of the bridge, the top length of the spur 2 is equal to the width of the bearing plate 3, which is 10.0m, and the bottom length is slightly shorter than the width of the bearing plate 3, which is 9.4m. The angle between the hypotenuse of the spur 2 and the bottom of the bearing plate 3 is less than 45 degrees, which is conducive to transferring the shear force of the bearing plate 3 near the pile foundation 1.

[0040] like Figure 4 As shown, the bearing plate 3 is connected to the newly-built widened roadbed 7 and the existing roadbed 8 through the corbel 4; the height of the corbel 4 is L3 = 0.44m, and the length is L4 = 0.37m; the longitudinal lap plate 5 and the transverse lap plate 6 are connected to the corbel 4 of the bearing plate 3 through the bolts 13; half of the bolts 13 are inserted into the longitudinal lap plate 5 and the transverse lap plate 6, and the other half are inserted into the corbel 4, and the spacing between the bolts 13 is 0.5m. The longitudinal lap plate is 11.33m long and 5.0m wide, and the transverse lap plate is 9.26m long and 5.0m wide.

[0041] A 2cm longitudinal joint 14 or a 1cm vertical joint 15 is reserved at the joints of the longitudinal slat 5 or transverse slat 6 and the corbel 4, respectively. The longitudinal joint 14 is filled with mastic asphalt filler, and the vertical joint 15 is provided with oil felt. The top surface of the longitudinal slat 5 and the transverse slat 6 is flush with the bearing plate 3. A 10cm thick C20 plain concrete 16 and a 20cm thick crushed stone cushion 17 are provided between the slat and the roadbed to ensure the stability of the joints between the longitudinal slat 5 and the transverse slat 6 and the roadbed.

[0042] A concrete bridge deck cast-in-place layer 10 with a thickness of 8 cm is arranged above the bearing plate 3, the longitudinal slab 5 and the transverse slab 6; a waterproof layer 11 is located between the concrete bridge deck cast-in-place layer 10 and the asphalt concrete bridge deck pavement layer 12. The thickness of the asphalt concrete bridge deck pavement layer 12 is 8 cm.

[0043] like Figure 4 As shown, the construction method of the roadbed widening pile-board structure of the present invention comprises the following steps:

[0044] Step 1: Level the site, move construction machinery into the site, insert steel sheet piles 18 to protect the existing roadbed, and use rotary drilling to construct pile foundation 1;

[0045] Step 2: Construction of the stem slope 2 and the bearing plate 3, specifically:

[0046] Carry out foundation treatment, set up cast-in-place bracket 19, erect formwork 20 and tie steel bars, then cast-in-place stem inclined 2 and bearing plate 3, and pre-embed bolts 13 on the bearing plate corbel;

[0047] Step 3: Construction of longitudinal slab 5 and transverse slab 6, specifically:

[0048] Pull out the steel sheet piles 18, carry out slope treatment on the existing roadbed 8, lay plain concrete 16 and crushed stone cushion 17 under the slab, fill the longitudinal joints 14 with asphalt mastic filler, set oil felt in the vertical joints 15, and cast the longitudinal slabs 5 and transverse slabs 6 in place by erecting molds;

[0049] Step 4: Lay the cast-in-place concrete bridge deck layer 10, the waterproof layer 11 and the asphalt concrete bridge deck pavement layer 12 to complete the construction of the pile-slab structure.

[0050] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", and "fix" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The content of the present invention is not limited to the embodiments listed, and any equivalent changes made to the technical solution of the present invention by ordinary technicians in this field after reading the description of the present invention are covered by the claims of the present invention.

Claims

1. A roadbed widening pile-board structure, characterized in that: Used for connecting a newly constructed widened roadbed (7) and an existing roadbed (8), comprising a bearing plate (3), wherein longitudinal slats (5) are respectively arranged on both sides of the bearing plate (3) along the longitudinal bridge; and a transverse slat (6) is arranged between the two longitudinal slats (5); A pile foundation (1) is arranged below the bearing plate (3), and a stem slope (2) is arranged between the bearing plate (3) and the pile foundation (1); The bearing plate (3) is connected to the newly-built widened roadbed (7) and the existing roadbed (8) via brackets (4); the longitudinal cladding (5) and the transverse cladding (6) are connected to the brackets (4) of the bearing plate (3) via bolts (13); A concrete bridge deck cast-in-place layer (10) is arranged above the bearing plate (3) and the longitudinal slab (5) and the transverse slab (6); and a waterproof layer (11) is located between the concrete bridge deck cast-in-place layer (10) and the asphalt concrete bridge deck pavement layer (12).

2. A roadbed widening pile-board structure according to claim 1, characterized in that: The pile foundations (1) are arranged asymmetrically in the transverse direction of the bridge and symmetrically in the longitudinal direction of the bridge.

3. A roadbed widening pile-board structure according to claim 2, characterized in that: Along the longitudinal direction of the bridge, the lower part of the stalk (2) is as wide as the diameter of the pile foundation (1); along the transverse direction of the bridge, the length of the top of the stalk (2) is equal to the width of the bearing plate (3).

4. A roadbed widening pile-board structure according to claim 3, characterized in that: The angle between the oblique edge of the stem (2) and the bottom of the bearing plate (3) is less than 45 degrees.

5. A roadbed widening pile-board structure according to claim 4, characterized in that: Half of the bolt (13) is inserted into the longitudinal strap (5) and the transverse strap (6), and the other half is inserted into the corbel (4).

6. A roadbed widening pile-board structure according to claim 5, characterized in that: A 2 cm longitudinal joint (14) or a 1 cm vertical joint (15) is reserved at the joints between the longitudinal lap board (5) or the transverse lap board (6) and the corbel (4), the longitudinal joint (14) is filled with asphalt mastic filler, and the vertical joint (15) is provided with oil felt.

7. A roadbed widening pile-board structure according to claim 6, characterized in that: A 10 cm thick layer of C20 plain concrete (16) and a 20 cm thick crushed stone cushion (17) are arranged between the slab and the roadbed to ensure the stability of the connection between the longitudinal slab 5 and the transverse slab 6 and the roadbed.

8. A construction method for a roadbed widening pile-board structure, characterized in that: The steps include: Step 1: Level the site, move construction machinery into the site, insert steel sheet piles (18) to protect the existing roadbed, and use rotary drilling to construct pile foundation (1); Step 2: Construction of the stem bevel (2) and the bearing plate (3); Step 3: Construction of longitudinal planking (5) and transverse planking (6); Step 4: Lay the cast-in-place concrete bridge deck layer (10), the waterproof layer (11) and the asphalt concrete bridge deck pavement layer (12) to complete the construction of the pile-slab structure.

9. The construction method of a roadbed widening pile-board structure according to claim 8, characterized in that: The step 2 is specifically as follows: The foundation is treated, a cast-in-place bracket (19) is set up, a formwork (20) is erected and steel bars are tied, then the in-place stalks (2) and the bearing plate (3) are cast, and bolts (13) are pre-buried on the bearing plate corbels.

10. The construction method of a roadbed widening pile-board structure according to claim 9, characterized in that: The step three is specifically as follows: The steel sheet piles (18) are pulled out, the existing roadbed (8) is subjected to slope treatment, plain concrete (16) and a crushed stone cushion layer (17) are laid under the slab, asphalt mastic filler is filled in the longitudinal joint (14), oil felt is arranged in the vertical joint (15), and the longitudinal slab (5) and the transverse slab (6) are cast in situ by erecting a mold.

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