Construction method of raising abutments for highway reconstruction and expansion

Abstract

The present invention discloses a construction method for raising abutments for highway reconstruction and expansion: the method comprises the following steps: 1) driving retaining walls at the median of the highway, and then excavating half of the old roadbed to the roadbed bottom surface. 2) sequentially completing the construction of multiple bored piles - half of the new pedestal - several pedestal bodies - cap beams, back walls and ear walls, and completing earth filling and erecting connecting beams and plates, so that the reconstructed half of the road surface can be opened to traffic normally first, and 3) completing the raising and reconstruction construction of the other half of the new abutment. The present invention solves the problem that the construction of half of the new pedestal causes the other half to be unable to continue to be open to traffic, and at the same time ensures that the construction of half of the new pedestal will not disturb the earthwork on the back of the other half of the new pedestal that has been completed, thereby ensuring the normal and safe passage of vehicles on the other half of the road that is open to traffic. The present invention reduces the construction difficulty, ensures construction safety, and significantly reduces the construction difficulty of the retaining walls and the construction cost of raising the abutments, thereby improving construction efficiency.

Description

Technical Field

[0001] The invention relates to a highway reconstruction and expansion project, in particular to a reconstruction construction method for raising a highway bridge abutment, and belongs to the technical field of bridge construction. Background Art

[0002] With the rapid development of my country's transportation industry, traffic volume on expressways has increased dramatically, and the existing road grades are increasingly unable to meet the current traffic demand. Twenty to thirty years after most expressways opened to traffic, local topography and river course changes occur. Long-term sediment deposition leads to riverbed elevation, necessitating a significant increase in existing flood control standards. Consequently, existing expressway bridges require expansion to expand flood drainage cross-sections and raise longitudinal elevations to enhance bridge flood control. Existing national highway bridges, due to their long service life and significant traffic pressure, cannot be fully closed for reconstruction and construction. A half-width construction and half-width maintenance mode must be implemented, increasing the construction complexity.

[0003] In recent years, highway bridge renovation and expansion projects have continued to emerge. The conventional method is to maintain the original elevation here without adjusting the longitudinal section, but it cannot solve problems such as flood control; or to extend the length of the bridge to a point where the elevation is smooth and stable, which undoubtedly greatly increases the cost. At present, there is no relevant technology that can solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for raising the abutment of a highway during reconstruction and expansion with half-width construction and half-width maintenance.

[0005] The present invention is achieved through the following technical solutions:

[0006] A construction method for raising abutments for highway reconstruction and expansion comprises the following steps:

[0007] 1) First, a retaining wall consisting of rows of I-steel pillars with their sides abutting each other is driven into the median of the highway between the abutments on both sides. Then, half of the old roadbed on one side of the median of the highway is excavated to the subgrade surface on the adjacent sides of the old abutments on both sides. At this time, the other half of the highway road surface is still open to traffic, thus completing the excavation of the retaining wall and half of the roadbed on one side of the median of the highway;

[0008] 2) In the vicinity of one side of the old abutment, pile foundation construction of multiple bored piles is sequentially carried out, and a new half-width abutment is constructed on top of the pile foundation, with the top surface of the new half-width abutment adjacent to the ground surface of the half-width roadbed where it is located; then, several spaced-apart abutment bodies are constructed on the top surface of the new half-width abutment, and then, an integrated cap beam and back wall are constructed on the top surface of the abutment body, with the top surface of the cap beam and the vertical side surfaces of the back wall forming a right-angled support surface for the end of the bridge deck; an ear wall is constructed at one end of the cap beam in the direction away from the shore, and the ear wall is vertically connected to one end of the cap beam; after the maintenance period of each construction component is completed, earth filling is carried out, and beams and slabs connecting the half-width new abutments on both sides are erected, completing the elevated reconstruction of the half-width new abutment on one side of the median of the expressway;

[0009] 3) At this time, half of the reconstructed highway road surface is open to traffic. On the adjacent sides of the other half of the old pier, pile foundation construction of multiple bored piles is carried out in sequence, and the other half of the new pier is built on top of the multiple pile foundation groups, with the top surface of the other half of the new pier being higher than the top surface of the other half of the new pier. Then, on the top surface of the other half of the new pier, several spaced pier bodies, cap beams, back walls and ear walls facing away from the shore are constructed in sequence. After the maintenance period of the components is completed, beams and slabs are erected and road surfaces are paved on the other half of the new piers on both sides, and slopes are filled on the outsides of the two halves of the new piers, thereby completing the elevation and reconstruction of the other half of the highway pier.

[0010] The purpose of the present invention can be further achieved by the following technical measures.

[0011] Furthermore, in step 2), the longitudinal sides of the new foundation are zigzag-shaped with rectangular outer convex parts and inner concave parts connected to each other, and the top of the bored pile is supported on the lower side of the outer convex part of the zigzag.

[0012] Furthermore, the support platform body in step 2) is in the shape of a right-angled trapezoid, and the bottom of the right-angled trapezoid is fixed on the new support platform at intervals.

[0013] Furthermore, in the step 2), a plurality of rectangular positioning blocks are provided at intervals in the longitudinal center of the top surface of the cap beam, and each positioning block matches the corresponding rectangular recess on the lower side of the beam plate end.

[0014] The steel support wall of the present invention solves the problem that during the construction of the half-width new pier, the earthwork slides to the traffic side of the other half, making it impossible to continue to keep the other half open. It also solves the problem that after the construction of the half-width new pier is completed, the foundation pit is excavated for the construction of the other half, resulting in a huge difference in the bottom elevation of the two new piers, and the foundation pit cannot be constructed due to the lack of an effective support wall. At the same time, it ensures that during the construction of the half-width new pier, the earthwork on the back of the other half of the new pier that has been completed will not be disturbed, ensuring the normal and safe passage of vehicles on the traffic side of the other half. The present invention not only reduces the excavation depth of the foundation pit, reduces the difficulty of construction, ensures construction safety, significantly reduces the construction difficulty of the support wall and the construction cost of raising the abutment, and improves construction efficiency.

[0015] Advantages and features of the present invention are illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a process diagram for the elevated reconstruction of half of the new abutment on one side of the median of the expressway;

[0017] Figure 2 This is a schematic diagram showing the completion of the elevation and reconstruction of the other half of the new abutment on the other side of the median of the expressway;

[0018] Figure 3 It is a structural diagram of the retaining wall;

[0019] Figure 4 This is a structural diagram of the new half-width bearing platform of the present invention;

[0020] Figure 5 yes Figure 4 A top view of

[0021] Figure 6 yes Figure 4 Right view of . DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and an embodiment of the construction of the elevated abutment No. 37 of the Lalin River Bridge on the Beijing-Harbin Expressway.

[0023] like Figures 1 to 4 As shown, this embodiment includes the following steps:

[0024] 1) If Figure 1 A and Figure 3As shown, a retaining wall 1 consisting of rows of 40# I-steel pillars 11 abutting each other on both sides of the median strip 10 of the expressway is first driven into the abutments on both sides. Then, the half of the old roadbed 20 on the right side of the median strip 10 of the expressway is excavated to the roadbed bottom surface 201 on the adjacent sides of the old abutments on both sides. At this time, the left half of the expressway road surface is still open to traffic, thereby completing the excavation construction of the retaining wall 1 and the half of the roadbed on the right side of the median strip 10 of the expressway.

[0025] 2) If Figure 1 and Figures 4 to 6 As shown, adjacent to one side of the old abutment, multiple bored piles 2 are sequentially constructed for the foundation. A new half-span abutment 3 is then constructed atop the pile foundations 2, with the top surface of the new half-span abutment 3 adjacent to the subgrade surface 201 of the roadbed. Several spaced-apart, right-angled trapezoidal abutment bodies 4 are then constructed atop the new half-span abutment 3. An integrated cap beam 5 and back wall 6 are then constructed atop the abutment bodies 4. The top surfaces of the cap beam 5 and the vertical sides of the back wall 6 form a right-angled support surface 7 for the end of the bridge deck. An ear wall 8 is constructed at one end of the cap beam 5, facing away from the shore. The ear wall 8 is vertically connected to the end of the cap beam 5 and serves as a retaining wall. After the curing period for each component has expired, earthwork is completed, and the beam slab 9 connecting the right half of the new abutment 20 on both sides of the highway is erected, completing the elevated reconstruction of the right half of the new abutment 20 on the right side of the median of the highway.

[0026] 3) At this time, the right half of the reconstructed expressway is open to traffic. Figure 1 B and Figure 3 As shown, on the adjacent sides of the left half of the old abutment 30, multiple bored piles 2 are sequentially constructed. Atop these piles, a new abutment 31 is constructed on the other half of the highway. The top surface of the new abutment 31 is higher than that of the new abutment 3 on the right. Several spaced-apart left abutment bodies 41, cap beams 5, back walls 6, and ear walls 8 facing away from the shore are then constructed on top of the new abutment 31. After the curing period for each component has expired, beams and slabs 9 are erected and road surface 91 is laid on the new abutment 30 on both sides of the highway. Slopes 40 are then constructed on the outer sides of the two new abutment halves, completing the elevated reconstruction of the new abutment 30 on the other half of the highway.

[0027] like Figure 5 As shown, in step 2), the longitudinal sides of the new cap 3 are respectively zigzag-shaped, with rectangular outer protrusions 31 and inner recesses 32 connected. The top of the bored pile 2 is supported on the lower side of the zigzag outer protrusions 31. Such a structure can reduce the mass of the new cap 3, thereby reducing the cost of the new cap 3.

[0028] like Figure 4 and Figure 5As shown, seven rectangular positioning blocks 51 are provided at intervals in the longitudinal center of the top surface of the cap beam 5 in step 2), and the positioning blocks 51 respectively match the rectangular pits 91 on the lower side of the end of the beam plate 9. Such a structure facilitates the positioning of the beam plate 9 on the cap beam 5.

[0029] In addition to the above embodiments, the present invention may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A construction method for raising abutments for highway reconstruction and expansion, characterized by: The following steps are involved: 1) First, a retaining wall consisting of rows of I-steel pillars with their sides abutting each other is driven into the median of the highway between the abutments on both sides. Then, half of the old roadbed on one side of the median of the highway is excavated to the subgrade surface on the adjacent sides of the old abutments on both sides. At this time, the other half of the highway road surface is still open to traffic, thus completing the excavation of the retaining wall and half of the roadbed on one side of the median of the highway; 2) In the vicinity of one side of the old abutment, pile foundation construction of multiple bored piles is carried out in sequence, and a new half-width abutment is built on top of the pile foundation, with the top surface of the new half-width abutment adjacent to the ground surface of the half-width roadbed where it is located; then, several spaced-apart abutment bodies are built on the top surface of the new half-width abutment, and then an integrated cap beam and back wall are built on the top surface of the abutment body, with the top surface of the cap beam and the vertical side surfaces of the back wall forming a right-angled support surface for the end of the bridge deck; an ear wall is built at one end of the cap beam in the direction away from the shore, and the ear wall is vertically connected to one end of the cap beam, completing the construction of the new half-width abutment after the elevation; after the maintenance period of each construction component is over, earth filling is carried out, and beams and slabs connecting the new half-width abutments on both sides are erected, completing the elevation and reconstruction construction of the new half-width abutment on one side of the median of the expressway; 3) At this point, the reconstructed half of the highway is open to traffic. On the adjacent sides of the other half of the old bridge cap, multiple bored pile foundations are constructed in sequence, and a new bridge cap is constructed on top of the multiple pile foundations. The top surface of the new bridge cap on the other side of the median of the highway is higher than the top surface of the new bridge cap on the other side of the median. Then, several spaced bridge cap bodies, cap beams, back walls, and ear walls facing away from the shore are constructed in sequence on the top surface of the new bridge cap on the other side of the new bridge cap. After the maintenance period of each component is completed, beams and slabs are erected and the road surface is paved on the new bridge cap on both sides of the other half. Slopes are then built on the outsides of the two new bridge caps, thereby completing the elevated reconstruction of the new bridge cap on the other half of the highway.

2. The method for raising abutments for highway reconstruction and expansion according to claim 1, characterized in that: In step 2), the longitudinal sides of the new foundation are zigzag-shaped with rectangular outer convex parts and inner concave parts connected to each other, and the top of the bored pile is supported on the lower side of the outer convex part of the zigzag.

3. The method for raising abutments for highway reconstruction and expansion according to claim 1, characterized in that: In the step 2), a plurality of rectangular positioning blocks are provided at intervals in the longitudinal center of the top surface of the cap beam, and each positioning block matches the corresponding rectangular recess on the lower side of the beam plate end.

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