Pile-plate retaining wall and construction method for existing anti-slide pile in highway widening and expansion

Abstract

This invention relates to a pile-slab retaining wall and construction method for retaining existing anti-slide piles during highway widening and expansion, comprising the following steps: constructing anti-slide piles above prefabricated locking buckles using portal-shaped square steel supports; driving Larssen steel sheet piles and connecting and fixing them to existing and newly added anti-slide piles via support rods; installing prefabricated assembled crossbeams on top of the existing and newly added anti-slide piles; and carrying out highway widening construction. The beneficial effects of this invention are: the use of rapid mechanical drilling technology for rectangular anti-slide piles, forming a steel reinforcement hoisting and adjustment support through prefabricated locking buckles and portal-shaped square steel supports, improves the construction quality and efficiency of the newly added anti-slide piles; and the use of existing anti-slide pile reinforcement technology allows for the secondary use of existing structures, enhancing the strength of the retaining wall by reinforcing the existing anti-slide piles, thus significantly reducing construction costs.

Description

Technical Field

[0001] This invention belongs to the field of roadbed reconstruction, and in particular relates to a pile-slab retaining wall for retaining existing anti-slide piles during highway widening and expansion, and its construction method. Background Technology

[0002] With the rapid development of my country's economy, there are increasingly higher demands on the traffic capacity of existing expressways. Many existing expressways, while structurally sound and in good working order, suffer from insufficient road width and limited traffic capacity, leading to traffic congestion and failing to meet the growing traffic demands brought about by economic development. Reconstructing expressways is prohibitively expensive and time-consuming. Therefore, the reconstruction and expansion of existing expressways has become a more economical and time-efficient solution. However, the widening and expansion of highways using pile-slab retaining walls presents challenges such as long construction periods and high project costs.

[0003] In summary, it is currently very important to find a method for constructing retaining walls using existing anti-slide piles for highway widening and expansion that is fast, easy to operate, and has high reliability in terms of construction quality. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for constructing a retaining wall for existing anti-slide piles used in highway widening and expansion.

[0005] This construction method for widening and expanding highways by retaining existing anti-slide piles and using pile-slab retaining walls includes the following steps: Step 1: First, excavate a foundation pit at the location of the new anti-slide pile and install the prefabricated anti-slide pile locking buckle. The anti-slide pile is then constructed above the prefabricated anti-slide pile locking buckle using a portal-shaped square steel bracket. Step 2: Drive Larssen sheet piles at the original slope design location and connect and fix them to the existing anti-slide piles and the newly added anti-slide piles through support rods; Step 3: Demolish the existing retaining wall and excavate the soil between the piles, and pour reinforcing concrete on the existing anti-slide piles; Step 4: Install retaining walls between the piles layer by layer on the outside of the existing and newly added anti-slide piles, and backfill and compact between the Larssen sheet piles and the retaining walls between the piles; Step 5: Connect adjacent newly added anti-slide piles and existing anti-slide piles with reinforcing ribs; install prefabricated assembled crossbeams on top of existing and newly added anti-slide piles; Step 6: Carry out road surface widening construction.

[0006] As a preferred option, in step one, the prefabricated locking buckles of the anti-slide piles are first processed and manufactured, and the prefabricated locking buckles of the anti-slide piles are equipped with embedded screws; after the drilling of the new anti-slide piles is carried out, the portal square steel bracket is connected to the embedded screws on the prefabricated locking buckles of the anti-slide piles.

[0007] Preferably, in step one, portal-shaped square steel supports are installed on both sides above the precast locking buckle of the anti-slide pile. The portal-shaped square steel supports are connected by crossbeams, and hand-operated hoists are installed on the crossbeams. The hand-operated hoists are used to hoist and adjust the steel cage of the new anti-slide pile through steel wire ropes. Cables are installed on both sides of the portal-shaped square steel supports and fixed to the original slope with steel stakes. After the steel cage of the new anti-slide pile is hoisted, the portal-shaped square steel supports are removed, and the concrete pouring construction of the new anti-slide pile is carried out. The above steps are repeated to construct the next new anti-slide pile.

[0008] As a preferred option, in step two, after the forest steel sheet piles are driven, a method of excavation and support is adopted. Multiple reinforcing beams are set on the side of the forest steel sheet piles facing the existing anti-slide piles to connect the forest steel sheet piles into a whole, and support rods are set on the reinforcing beams to connect and fix them to the existing anti-slide piles and the newly added anti-slide piles.

[0009] As a preferred option, in step three, after excavating the soil between the piles, the existing anti-slide piles and the newly added anti-slide piles are stripped out. First, reinforcing bars are installed on the existing anti-slide piles, then the reinforcing steel cage is tied, and after the formwork is erected, the reinforcing concrete is poured.

[0010] As a preferred option, in step four, retaining plates between piles are installed layer by layer from bottom to top on the outside of the existing anti-slide piles and the newly added anti-slide piles using a sequential construction method, and the support rods at the installation positions of the retaining plates between piles are removed.

[0011] Preferably, step five also includes setting embedded parts on both sides of the newly added anti-slide pile, setting ear plates at both ends of the reinforcing rib plate, and opening side grooves on the ear plates. The side grooves of the reinforcing rib plate are connected and fixed to the embedded parts of the newly added anti-slide pile and the rebar installed when reinforcing the existing anti-slide pile in a sequential manner. The existing anti-slide pile is provided with rebar at the top, and the newly added anti-slide pile is provided with embedded parts at the top for fixing and installing the prefabricated assembled crossbeam.

[0012] As a preferred option, in step six, there is an existing drainage ditch on the outside of the highway. The existing drainage ditch is demolished and a new drainage ditch is built on the side of the existing anti-skid piles and the newly added anti-skid piles facing the highway. The highway road surface is widened at the original location of the existing drainage ditch, the existing retaining wall and the location of the excavated soil between the piles.

[0013] For highway widening and expansion, existing anti-slide piles are retained as pile-slab retaining walls, obtained by any of the methods described above.

[0014] The beneficial effects of this invention are: 1) This invention adopts a mechanical rapid drilling technology for rectangular anti-slide piles, which forms a support for lifting and adjusting the reinforcing bars by prefabricated locking buckles and portal square steel brackets, thereby improving the construction quality and efficiency of newly added anti-slide piles.

[0015] 2) This invention uses existing anti-slide pile reinforcement technology to reuse the existing structure. By reinforcing the existing anti-slide piles, the strength of the retaining wall is improved, which greatly reduces the construction cost.

[0016] 3) This invention adopts prefabricated rib column reinforcement, which connects adjacent new anti-slide piles and existing anti-slide piles through reinforcement rib plates. This reduces the thickness of the retaining plate between piles and improves its soil retaining capacity. It is also convenient to construct and reduces construction costs.

[0017] 4) This invention significantly improves the construction efficiency of highway widening and expansion, reduces construction costs, and reduces the construction cycle and traffic impact of widening and expansion of existing highways. When applied to actual engineering projects, it can achieve good technical, economic and social benefits. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the cross-section of the retaining wall of the existing anti-slide piles used in the widening and expansion of the highway; Figure 2 This is a schematic diagram of the plan of the retaining pile-slab retaining wall for existing anti-slide piles during highway widening and expansion. Figure 3 This is a detailed plan view of the combined structure of existing anti-slide piles, newly added anti-slide piles, and Larssen sheet piles. Figure 4 This is a detailed elevation view of the reinforcement rib installation; Figure 5 This is a detailed schematic diagram of the reinforcing ribs; Figure 6 This is a schematic diagram of the prefabricated interlocking mechanism for anti-slide piles; Figure 7 This is a schematic diagram of a prefabricated locking mechanism and a portal-shaped square steel bracket forming a support for lifting and adjusting reinforcing bars.

[0019] In the diagram: 1-Original slope, 2-Larsen sheet pile, 3-Pile retaining wall, 4-Existing anti-slide pile, 5-Soil between piles, 6-Existing retaining wall, 7-Drainage ditch, 8-Road, 9-Reinforced connecting beam, 10-Support rod, 11-New anti-slide pile, 12-Rebar installation, 13-Reinforcement cage, 14-Reinforcement rib, 15-Reinforcement concrete, 16-Precast assembled crossbeam, 17-Embedded bolt, 18-Precast anti-slide pile lock, 19-Cable, 20-Wire rope, 21-Hand chain hoist, 22-Crossbeam, 23-Portal square steel support, 24-Steel chisel, 25-Ear plate, 26-Side groove. Detailed Implementation

[0020] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0021] Example 1 As one example, such as Figures 1 to 7 As shown, the main construction steps of this method for retaining pile-slab retaining walls with existing anti-slide piles during highway widening and expansion are as follows: Step 1: Mechanical rapid drilling construction of rectangular anti-slide piles: (e.g.) Figure 6 and Figure 7 As shown, the process begins with the fabrication of prefabricated anti-slide pile locking clips 18, on which pre-embedded screws 17 are installed. All prefabricated anti-slide pile locking clips 18 are prefabricated in the factory. First, a foundation pit is excavated at the location of the new anti-slide pile 11 to install the prefabricated locking clips 18. Drilling of the new anti-slide pile 11 is then carried out. After the drilling is completed, a portal-shaped square steel support 23 is connected to the pre-embedded screws 17 on the prefabricated locking clips 18. The portal-shaped square steel supports 23 are connected by crossbeams 22, and a hand-operated hoist 21 is installed on the crossbeams 22. The steel wire rope 20 on the hand-operated hoist 21 is used to hoist and adjust the reinforcing cage of the new anti-slide pile 11. To ensure stability during hoisting, cables 19 are installed on both sides of the portal-shaped square steel support 23, and the cables 19 are fixed by steel stakes 24. After the reinforcing cage of the new anti-slide pile 11 is hoisted, the hoisting components are removed, and concrete pouring of the new anti-slide pile 11 is carried out. The above steps are repeated for the construction of the next new anti-slide pile 11. Step 2: Construction of temporary flexible support for steel sheet piles: (e.g.) Figures 1 to 3 As shown, firstly, Larssen steel sheet piles 2 are driven at the original slope 1 design location. After the Larssen steel sheet piles are driven, the method of excavation and support is adopted. Multiple reinforcing beams 9 are set on the Larssen steel sheet piles to connect the Larssen steel sheet piles into a whole. Support rods 10 are set on the reinforcing beams 9 to connect and fix with the existing anti-slide piles 4 and the newly added anti-slide piles 11. Step 3: Construction of 16 precast assembled crossbeams and connecting piles: (e.g.) Figure 4 As shown, a prefabricated assembled crossbeam 16 is installed on the top of the existing anti-slide pile 4 and the newly added anti-slide pile 11; the prefabricated assembled crossbeam 16 is prefabricated in the factory, wherein the existing anti-slide pile 4 has a rebar 12 installed on the top and the newly added anti-slide pile 11 has an embedded part installed on the top. Step 4, Road Construction: Demolish the existing drainage ditch 7, and build a new drainage ditch 7 outside the existing anti-slide piles 4 and the newly added anti-slide piles 11. Widen the road surface of highway 8 at the locations of the existing drainage ditch 7, the existing retaining wall 6 and the excavated soil between the piles 5.

[0022] Example 2 As another embodiment, this embodiment two proposes, based on embodiment one, that between steps two and three, there is also the non-destructive stripping and reinforcement construction of the existing anti-slide pile 4 and the construction of prefabricated assembled rib column reinforcement, and the adjacent newly added anti-slide pile 11 and the existing anti-slide pile 4 are connected by the reinforcing rib plate 14; specifically: Construction of non-destructive stripping and reinforcement of existing anti-slide piles 4: demolish the existing retaining wall 6 and excavate the soil between the piles 5, so that the existing anti-slide piles 4 and the newly added anti-slide piles 11 can be stripped without damage; install rebars 12 on the existing anti-slide piles 4, tie the reinforcing steel cage 13, set up the formwork and pour the reinforcing concrete 15. Construction of prefabricated ribbed columns in the direction of construction: After the existing anti-slide pile 4 is reinforced, the pile retaining plate 3 is installed layer by layer from bottom to top on the outside of the existing anti-slide pile 4 and the newly added anti-slide pile 11 in the direction of construction. The support rod 10 is removed at the installation position of the pile retaining plate 3, and backfilling and compaction are carried out between the Larssen steel sheet pile 2 and the pile retaining plate 3. Embedded parts are installed on both sides of the newly added anti-slide pile 11, such as... Figure 5 As shown, the reinforcing rib plate 14 has ear plates 25 at both ends, and the ear plates 25 have side grooves 26. The side grooves 26 of the reinforcing rib plate 14 are connected and fixed to the pre-embedded parts of the newly added anti-slide pile 11 and the anchoring bars 12 installed when reinforcing the existing anti-slide pile 4 in a sequential manner. The existing anti-slide pile 4 has anchoring bars 12 at the top, and the newly added anti-slide pile 11 has pre-embedded parts at the top, which are used to fix and install the prefabricated assembled crossbeam 16.

[0023] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0024] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A construction method for widening an existing anti-slide pile retaining wall by using pile boards, characterized in that, Includes the following steps: Step 1: First, excavate a foundation pit at the location of the new anti-slide pile and install the prefabricated anti-slide pile locking buckle. The anti-slide pile is then constructed above the prefabricated anti-slide pile locking buckle using a portal-shaped square steel bracket. Step 2: Drive Larssen sheet piles at the original slope design location and connect and fix them to the existing anti-slide piles and the newly added anti-slide piles through support rods; Step 3: Demolish the existing retaining wall and excavate the soil between the piles, and pour reinforcing concrete on the existing anti-slide piles; Step 4: Install retaining walls between the piles layer by layer on the outside of the existing and newly added anti-slide piles, and backfill and compact between the Larssen sheet piles and the retaining walls between the piles; Step 5: Connect adjacent newly added anti-slide piles and existing anti-slide piles with reinforcing ribs; install prefabricated assembled crossbeams on top of existing and newly added anti-slide piles; Step 6: Carry out road surface widening construction.

2. The construction method of claim 1, wherein, In step one, the prefabricated locking buckles of the anti-slide piles are first processed and manufactured, and the prefabricated locking buckles of the anti-slide piles are equipped with embedded screws; after the drilling of the new anti-slide piles is carried out, the portal square steel bracket is connected to the embedded screws on the prefabricated locking buckles of the anti-slide piles.

3. The construction method of claim 1, wherein the method further comprises: In step one, portal-shaped square steel supports are installed on both sides above the precast locking buckle of the anti-slide pile. The portal-shaped square steel supports are connected by crossbeams, and hand-operated hoists are installed on the crossbeams. The hand-operated hoists are used to hoist and adjust the steel cage of the new anti-slide pile through steel wire ropes. Cables are installed on both sides of the portal-shaped square steel supports and fixed to the original slope with steel stakes. After the steel cage of the new anti-slide pile is hoisted, the portal-shaped square steel supports are removed, and the concrete pouring construction of the new anti-slide pile is carried out. The above steps are repeated to construct the next new anti-slide pile.

4. The construction method of claim 1, wherein the method further comprises: In step two, after the forest steel sheet piles are driven, the method of excavation and support is adopted. Multiple reinforcing beams are set on the side of the forest steel sheet piles facing the existing anti-slide piles to connect the forest steel sheet piles into a whole. Support rods are set on the reinforcing beams to connect and fix them to the existing anti-slide piles and the newly added anti-slide piles.

5. The construction method of claim 1, wherein the method further comprises: In step three, after the soil between the piles is removed, the existing anti-slide piles and the newly added anti-slide piles are stripped out. First, rebar is installed on the existing anti-slide piles, then the reinforcing steel cage is tied, and after the formwork is erected, the reinforcing concrete is poured.

6. The construction method of claim 1, wherein the method further comprises: In step four, retaining plates between piles are installed layer by layer from bottom to top on the outside of existing and newly added anti-slide piles using a sequential construction method, and the support rods at the installation positions of the retaining plates between piles are removed.

7. The construction method of claim 1, wherein the method further comprises: Step five also includes setting embedded parts on both sides of the newly added anti-slide piles, and setting ear plates at both ends of the reinforcing ribs. The ear plates have side grooves. The side grooves of the reinforcing ribs are connected and fixed to the embedded parts of the newly added anti-slide piles and the rebars installed when reinforcing the existing anti-slide piles in a sequential manner. The existing anti-slide piles have rebars at the top and the newly added anti-slide piles have embedded parts at the top for fixing and installing the prefabricated assembled crossbeams.

8. The construction method of claim 1, wherein the method further comprises: In step six, there is an existing drainage ditch on the outside of the highway. The existing drainage ditch is demolished and a new drainage ditch is built on the side of the existing anti-slide piles and the newly added anti-slide piles facing the highway. The highway road surface is widened at the original location of the existing drainage ditch, the existing retaining wall and the soil between the piles.

9. A pile-plate retaining wall for use in widening an existing highway, wherein the pile-plate retaining wall is characterized by, Obtained by the method described in any one of claims 1 to 8.

Images