A construction method for high-fill airport roadbed in mountainous area

Abstract

A construction method for a high-fill airport roadbed in a mountainous area comprises the following steps: digging a plurality of pile pits at a base layer at the bottom of a mountain, inserting steel cages into the plurality of pile pits, pouring concrete on the steel cages, filling with cement soil, sleeves being sleeved outside the steel cages outside the top of the cement soil layer, pouring concrete in the sleeves, connecting chains between four adjacent sleeves arranged in a rectangular manner, connecting two adjacent sets of chain connection structures with chains, pouring concrete on a plurality of "X"-shaped chains and curing them, placing stones in the gaps of the chain connection nets, fully paving the chain connection nets with concrete, continuing to extend the next concrete layer upwards according to the above steps on the top of the concrete layer, and paving the road surface on the top of the uppermost concrete layer. The invention fills cement soil between concrete piles, then casts a concrete layer on the top of the cement soil layer, and continues to build concrete piles upwards and fills with cement soil on the top of the concrete layer until the area to be high-filled is leveled.

Description

Technical Field

[0001] The invention relates to a high-fill construction process in mountainous areas, in particular to a construction method for a high-fill airport roadbed in mountainous areas. Background Art

[0002] With the gradual development of mountainous areas, the development of transportation in mountainous areas has become crucial. The traditional rugged roads in mountainous areas can no longer meet the needs of development. Building airports in mountainous areas can effectively improve traffic capacity, but it is difficult to build large buildings such as airports in the complex environment of mountainous areas. The construction of airports requires leveling measures such as flattening the top of the mountain and filling deep trenches. The construction volume is huge and there are many hidden dangers in construction. The base surface leveled by flattening the top of the mountain has great strength, but the strength of the filler and the choice of material when filling deep trenches have a great impact on the later use and maintenance. Traditional high-fill materials are generally plain soil and gravel. These materials are prone to roadbed collapse and settlement under the long-term large aircraft load and rain erosion at the airport. Because it is a high fill, it is very troublesome to repair when the roadbed collapses and settles, and it requires a lot of manpower and material resources. The selection of suitable fillers and construction processes can effectively avoid these disadvantages and increase the service life of high-fill floors in mountainous areas. Summary of the invention

[0003] In order to overcome the shortcomings of the background technology, the present invention discloses a construction method for a high-fill airport roadbed in a mountainous area, which comprises the following steps: constructing concrete piles at the base layer at the bottom of the mountain, filling cement soil between the concrete piles to form a cement soil layer with concrete piles, and then casting concrete supported by chains and paved with large-grained stones on the top of the cement soil layer to form a concrete layer, and continuously constructing concrete piles and filling cement soil on the top of the concrete layer until the area to be high-filled is filled, so that the high-fill airport roadbed forms a solid roadbed foundation with concrete piles and concrete layers as the skeleton and cement soil with relatively high hardness as the filler. Compared with the existing simple soil filling and reinforced concrete skeleton filling, the method has the characteristics of high construction efficiency and stable structure.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme: A construction method for a high-fill airport roadbed in a mountainous area comprises the following steps: Step 1: dig multiple pile pits in the base layer at the bottom of the mountain: dig multiple pile pits extending into the base layer at the bottom of the mountain in an equidistant array at the base surface of the mountain where high filling is required; Step 2: insert steel cages into multiple pile pits: make steel cages A with the same number as the pile pits and spiral steel bars A extending from the upper ends of the vertical steel bars A, and insert the lower ends of the multiple steel cages A into the pile pits; Step 3, pouring concrete on the steel cage: Wrap the formwork on the outside of the middle to lower part of the steel cage A outside the top of the pile pit and pour concrete, so that the middle and lower part of the steel cage A and the lower end located in the pile pit form a concrete pile after the concrete is dried; Step 4: Fill with cement soil: Fill the area from the bottom of the mountain to the top of the concrete pile that needs to be filled with cement soil and compact it to form a cement soil layer; Step 5: Sleeve the sleeve outside the steel cage located outside the top of the cement soil layer: Sleeve the sleeve outside the steel cage A located outside the top of the cement soil layer so that the upper end of the vertical steel bar A is located outside the top of the sleeve, and weld the steel cage A and the sleeve with a "M" shaped steel bar; Step 6: pouring concrete in the sleeve: pouring concrete on the steel cage A and the "M"-shaped steel bars in the sleeve and drying and solidifying, so that the steel cage A in the sleeve forms a concrete seat and is connected to the sleeve as a whole, and the upper end of the vertical steel bar A is located outside the top of the concrete seat; Step 7, connecting chains between four adjacent rectangular sleeves: welding hanging rings at the middle of the outer wall of each of the four adjacent rectangular sleeves according to the relative diagonal positions, the four vertices of the "X"-shaped chain are respectively tightly connected to the four hanging rings, the "X"-shaped chain is in a suspended state, and multiple square chains are spaced on the "X"-shaped chain and gradually expand with the intersection of the "X"-shaped chain as the center, so that the multiple square chains form a U-shaped structure, the distance between adjacent square chains is 40-50 cm, and the multiple square chains and the "X"-shaped chain are connected to form a group of chain connection structures; Step 8: Use chains to connect between each two adjacent groups of chain connection structures: connect multiple connection chains at intervals between each two adjacent groups of chain connection structures, so that the multiple groups of chain connection structures form a chain connection network; Step 9, pouring concrete on multiple "X"-shaped chains and curing them: Wrapping the multiple "X"-shaped chains with concrete of the same height as the sleeve and curing them, so that the multiple "X"-shaped chains after pouring concrete form an "X"-shaped concrete column, and the connection between the multiple square chains and the "X"-shaped chain is also located in the "X"-shaped concrete column; Step 10: Place stones in the gaps of the chain-connecting net: Place stones at intervals in the gaps of the chain-connecting net after pouring the "X"-shaped concrete column. The particle size of the stones should be 20-30 cm. Step 11: Use concrete to fully spread the chain connection net: Use concrete to wrap the remaining part of the chain connection net after pouring the "X"-shaped concrete column and make it flush with the top of the "X"-shaped concrete column to form a concrete platform with an integral structure. The concrete platform and the sleeve are of equal height and together form a concrete layer; Step 12, continue to extend the next concrete layer upwards according to the above steps on the top of the concrete layer: connect the steel cage B to the upper end of the vertical steel bars A at the top of the multiple sleeves, and make the upper end of the vertical steel bars B provided in the steel cage B extend out of the top of the spiral steel bars B, pour concrete on the steel cage B according to the above steps, and then fill cement soil after pouring concrete until the second concrete layer is built, and continue to build the third concrete layer using the upper end of the vertical steel bars B, forming a staggered arrangement of cement soil layers and concrete layers; Step 13: Lay the road surface on top of the top concrete layer: When multiple concrete layers are built and there are no more vertical steel bars extending from the top of the top concrete layer, lay a gravel layer on top of the top concrete layer, and lay the reinforced concrete road surface on top of the gravel layer.

[0005] In the construction method of the high-fill airport roadbed in mountainous areas, a layered compaction construction process is adopted when filling cement soil in step 4, and the thickness of each layer is 30-40 cm.

[0006] In the construction method of the high-fill airport roadbed in mountainous area, the mixing ratio of cement and soil in step 4 is 10-15% cement and 85-90% soil.

[0007] In the construction method of the high-fill airport roadbed in mountainous area, the height of the sleeve in step 5 is 40-50 cm.

[0008] In the construction method of the high-fill airport roadbed in the mountainous area, in step five, there are multiple "M"-shaped steel bars coaxial with the steel cage A, the middle part of the "M"-shaped steel bars is welded to the steel cage A, and the end of the "M"-shaped steel bars is welded to the inner wall of the sleeve.

[0009] In the construction method of the high-fill airport roadbed in mountainous area, the connection method of the square chain and the "X"-shaped chain in step seven is hook connection or welding.

[0010] In the construction method of the high-fill airport roadbed in mountainous area, in step eight, the multiple connecting chains between each two adjacent chain connecting structures are parallel to each other.

[0011] In the construction method of the high-fill airport roadbed in the mountainous area, in step nine, when pouring concrete on multiple "X"-shaped chains, no formwork is used for clamping, so that the cross-section of the "X"-shaped concrete column is a trapezoidal structure after being formed.

[0012] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: The construction method of the high-fill airport roadbed in the mountainous area described in the present invention comprises the following steps: a plurality of pile pits are dug out in an equidistant array at the base layer at the bottom of the mountain; concrete piles whose upper ends are not filled with concrete are put into each pile pit; cement soil is filled between the concrete piles to form a cement soil layer with concrete piles; a sleeve is sleeved outside the steel cage on the top of the cement soil layer; concrete supported by "X"-shaped chains and square chains and paved with large-grained stones is cast between the sleeves to form a concrete layer; concrete piles are continuously constructed upward on the top of the concrete layer and cement soil is filled; cement soil layers and concrete layers are constructed at intervals according to the above steps until the area to be high-filled is filled, so that the high-fill airport roadbed forms a solid roadbed foundation with hard concrete piles and concrete layers as the skeleton and cement soil with greater hardness as the filler; the high-fill airport roadbed has the characteristics of high construction efficiency and stable structure compared with the existing simple soil filling and reinforced concrete skeleton filling; and the drawbacks of the cumbersome construction and complicated process of the traditional reinforced concrete layer slab are optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a flow chart of the construction steps of the present invention; Figure 2 It is a structural schematic diagram of construction step 1 of the present invention; Figure 3 It is a structural schematic diagram of the construction step 2 of the present invention; Figure 4 It is a structural schematic diagram of construction step three of the present invention; Figure 5 It is a structural schematic diagram of construction step 4 of the present invention; Figure 6 This is a structural schematic diagram of construction step five of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the steel cage A and the sleeve in the construction step five of the present invention; Figure 8 It is a structural schematic diagram of construction step six of the present invention; Fig. 9 It is a schematic diagram of the structure of the cooperation between the "X"-shaped chain and the sleeve in the seventh construction step of the present invention; Fig.10 This is a structural schematic diagram of construction step seven of the present invention; Fig.11 It is a structural schematic diagram of construction step eight of the present invention; Fig.12 This is a structural schematic diagram of construction step nine of the present invention; Fig.13 This is a structural schematic diagram of construction step 10 of the present invention; Fig.14 This is a structural schematic diagram of construction step eleven of the present invention; Fig.15 This is a structural schematic diagram of construction step 12 of the present invention; Fig.16 It is a structural schematic diagram of construction step thirteen of the present invention.

[0014] In the figure: 1. Pile pit; 2. Base layer at the bottom of the mountain; 3. Base surface at the bottom of the mountain; 4. Steel cage A; 5. Spiral steel bar A; 6. Vertical steel bar A; 7. Concrete pile; 8. Cement soil layer; 9. Sleeve; 10. "M" shaped steel bar; 11. Hanging ring; 12. Concrete seat; 13. "X" shaped chain; 14. Square chain; 15. Connecting chain; 16. "X" shaped concrete column; 17. Stone; 18. Concrete layer; 19. Steel cage B; 20. Spiral steel bar B; 21. Vertical steel bar B; 22. Top concrete layer; 23. Gravel layer; 24. Reinforced concrete pavement. DETAILED DESCRIPTION

[0015] The present invention can be explained in more detail by the following examples, the present invention is not limited to the following examples, and the purpose of disclosing the present invention is to protect all changes and improvements within the scope of the present invention; Combined with Figures 1 to 16 The construction method of the high-fill airport roadbed in the mountainous area comprises the following steps: Step 1: dig multiple pile pits in the base layer at the bottom of the mountain: dig multiple pile pits 1 extending into the base layer 2 at the bottom of the mountain in an equidistant array at the base surface 3 at the bottom of the mountain where high filling is required; Step 2: insert steel cages into multiple pile pits: make the same number of steel cages A4 as the pile pit 1, with the spiral steel bars A5 extending from the upper ends of the vertical steel bars A6, and insert the lower ends of the multiple steel cages A4 into the pile pit 1; Step 3, pouring concrete on the steel cage: Wrap the outer formwork from the middle to the lower part of the steel cage A4 located outside the top of the pile pit 1 with concrete, so that the middle and lower parts of the steel cage A4 and the lower end located in the pile pit 1 form a concrete pile 7 after the concrete is dried; Step 4: Filling with cement soil: Fill the area between the base surface 3 at the bottom of the mountain and the upper end of the concrete pile 7 with cement soil and compact it to form a cement soil layer 8. When filling the cement soil, a layered compaction construction process is adopted, and the thickness of each layer is 30-40 cm. The mixing ratio of cement soil is 10-15% cement and 85-90% soil. Step 5, sleeve sleeve is connected to the outside of the steel cage outside the top of the cement soil layer: sleeve sleeve 9 is sleeved to the outside of the steel cage A4 outside the top of the cement soil layer 8 so that the upper end of the vertical steel bar A6 is located outside the top of the sleeve 9, and the steel cage A4 and the sleeve 9 are welded and connected with the "M" shaped steel bar 10. The height of the sleeve 9 is 40-50 cm. There are multiple "M" shaped steel bars 10 and they are coaxial with the steel cage A4. The middle part of the "M" shaped steel bar 10 is welded to the steel cage A4, and the end of the "M" shaped steel bar 10 is welded to the inner wall of the sleeve 9; Step 6: pouring concrete in the sleeve: pouring concrete on the steel cage A4 and the "M"-shaped steel bar 10 in the sleeve 9 and drying and solidifying, so that the steel cage A4 in the sleeve 9 forms a concrete seat 12 and is connected to the sleeve 9 as a whole, and the upper end of the vertical steel bar A6 is located outside the top of the concrete seat 12; Step 7, connecting chains between four adjacent rectangular sleeves: welding a hanging ring 11 at the middle of the outer wall of each of the four adjacent rectangular sleeves 9 according to the relative diagonal positions, the four vertices of the "X"-shaped chain 13 are respectively tightly connected to the four hanging rings 11, the "X"-shaped chain 13 is in a suspended state, and a plurality of square chains 14 are sleeved on the "X"-shaped chain 13 at intervals and gradually expanded with the intersection of the "X"-shaped chain 13 as the center, so that the plurality of square chains 14 form a U-shaped structure, the distance between adjacent square chains 14 is 40-50 cm, and the plurality of square chains 14 and the "X"-shaped chain 13 are connected to form a group of chain connection structures, and the connection mode of the square chain 14 and the "X"-shaped chain 13 is hook connection or welding; Step 8: Use chains to connect between each two adjacent groups of chain connection structures: connect multiple connection chains 15 at intervals between each two adjacent groups of chain connection structures, so that the multiple groups of chain connection structures form a chain connection network, and the multiple connection chains 15 between each two adjacent chain connection structures are parallel to each other; Step 9, pouring concrete on multiple "X" shaped chains and curing: Wrapping and pouring concrete of the same height as the sleeve 9 on the multiple "X" shaped chains 13 and curing it, so that the multiple "X" shaped chains 13 after pouring concrete form an "X" shaped concrete column 16, and the connection between the multiple square chains 14 and the "X" shaped chain 13 is also located in the "X" shaped concrete column 16. When wrapping and pouring concrete on the multiple "X" shaped chains 13, no formwork is used for clamping, so that the cross-section of the "X" shaped concrete column 16 is a trapezoidal structure after forming; Step 10, placing stones in the gaps of the chain connection net: stones 17 are placed in the gaps of the chain connection net after pouring the "X"-shaped concrete column 16, and the particle size of the stone 17 is 20-30 cm; Step 11: Use concrete to fully spread the chain connection net: Use concrete to wrap the remaining part of the chain connection net after pouring the "X"-shaped concrete column 16 and make it flush with the top of the "X"-shaped concrete column 16 to form a concrete platform of an integral structure. The concrete platform and the sleeve 9 are of the same height and together form a concrete layer 18; Step 12, continue to extend the next concrete layer upwards according to the above steps on the top of the concrete layer: connect the steel cage B19 to the upper end of the vertical steel bars A6 on the top of the multiple sleeves 9, and make the upper end of the vertical steel bar B21 provided in the steel cage B19 extend out of the top of the spiral steel bar B20, pour concrete on the steel cage B19 according to the above steps, and then fill cement soil after pouring concrete until the second concrete layer is built, and continue to build the third concrete layer using the upper end of the vertical steel bar B21, forming a staggered arrangement of cement soil layers and concrete layers; Step 13: Laying the road surface on top of the top concrete layer: When multiple concrete layers are built, there are no more vertical steel bars extending from the top of the top concrete layer 22. A gravel layer 23 is laid on top of the top concrete layer 22, and a reinforced concrete road surface 24 is laid on top of the gravel layer 23.

[0016] The present invention digs a plurality of pile pits 1 in an equidistant array at a base layer 2 at the bottom of a mountain, puts concrete piles 7 whose upper ends are not filled with concrete into each pile pit 1, fills cement soil between the concrete piles 7, forms a cement soil layer 8 with concrete piles 7, sleeves 9 are sleeved on the outside of a steel cage A4 on the top of the cement soil layer 8, casts concrete supported by "X"-shaped chains 13 and square chains 14 and paved with large-grained stones 17 between the sleeves 9 to form a concrete layer 18, continues to build concrete piles upward on the top of the concrete layer 18 and fills with cement soil, and builds cement soil layers and concrete layers at intervals according to the above steps until the area to be high-filled is filled, so that the high-fill airport roadbed forms a solid roadbed foundation with hard concrete piles and concrete layers as a skeleton and cement soil with relatively high hardness as a filler, and has the characteristics of high construction efficiency and stable structure compared with the existing simple soil filling and reinforced concrete skeleton filling.

[0017] Parts of the present invention not described in detail are prior art.

Claims

1. A construction method for a high fill airport roadbed in a mountainous area, characterized in that: The following steps are involved: Step 1: dig a plurality of pile pits in the base layer at the bottom of the mountain: dig a plurality of pile pits (1) extending into the base layer (2) at the bottom of the mountain in an equidistant array at the base surface (3) of the mountain where high filling is required; Step 2: inserting steel cages into the plurality of pile pits: making steel cages A (4) having the same number as the pile pits (1) and with the upper ends of the vertical steel bars A (6) extending out of the spiral steel bars A (5), and inserting the lower ends of the plurality of steel cages A (4) into the pile pits (1); Step 3, pouring concrete on the steel cage: Wrapping the outer formwork from the middle to the lower part of the steel cage A (4) located outside the top of the pile pit (1) with concrete, so that the middle and lower parts of the steel cage A (4) and the lower end located in the pile pit (1) form a concrete pile (7) after the concrete is dried; Step 4: Filling with cement soil: Fill the area between the base surface (3) at the bottom of the hill and the top of the concrete pile (7) with cement soil and compact it to form a cement soil layer (8); Step 5: Sleeve the sleeve on the outside of the steel cage located outside the top of the cement soil layer: Sleeve the sleeve (9) on the outside of the steel cage A (4) located outside the top of the cement soil layer (8) so that the upper end of the vertical steel bar A (6) is located outside the top of the sleeve (9), and the steel cage A (4) and the sleeve (9) are welded and connected using "M" shaped steel bars (10); Step 6: pouring concrete in the sleeve: pouring concrete on the steel cage A (4) and the "M"-shaped steel bars (10) in the sleeve (9) and drying and solidifying, so that the steel cage A (4) in the sleeve (9) forms a concrete seat (12) and is connected to the sleeve (9) as a whole, and the upper end of the vertical steel bar A (6) is located outside the top of the concrete seat (12); Step 7, connecting chains between four adjacent rectangular sleeves: welding a hanging ring (11) at the middle of the outer wall of each of the four adjacent rectangular sleeves (9) according to the relative diagonal positions, the four vertices of the "X"-shaped chain (13) are respectively tightly connected to the four hanging rings (11), the "X"-shaped chain (13) is in a suspended state, and a plurality of square chains (14) are sleeved on the "X"-shaped chain (13) at intervals and gradually expand with the intersection of the "X"-shaped chain (13) as the center, so that the plurality of square chains (14) form a U-shaped structure, the distance between adjacent square chains (14) is 40-50 cm, and the plurality of square chains (14) and the "X"-shaped chain (13) are connected to form a group of chain connection structures; Step 8: Use chains to connect between each two adjacent groups of chain connection structures: connect multiple connection chains (15) at intervals between each two adjacent groups of chain connection structures, so that the multiple groups of chain connection structures form a chain connection network; Step 9, pouring concrete on the multiple "X"-shaped chains and curing them: Wrapping the multiple "X"-shaped chains (13) with concrete of the same height as the sleeve (9) and curing them, so that the multiple "X"-shaped chains (13) after pouring concrete form an "X"-shaped concrete column (16), and the connection between the multiple square chains (14) and the "X"-shaped chain (13) is also located in the "X"-shaped concrete column (16); Step 10: Placing stones in the gaps of the chain connection net: After pouring the "X"-shaped concrete column (16), stones (17) are placed at intervals in the gaps of the chain connection net. The particle size of the stones (17) is 20-30 cm. Step 11: Use concrete to fully spread the chain connection net: Use concrete to wrap the remaining part of the chain connection net after pouring the "X"-shaped concrete column (16) and make it flush with the top of the "X"-shaped concrete column (16) to form a concrete platform of an integral structure. The concrete platform and the sleeve (9) are of the same height and together form a concrete layer (18); Step 12, continuing to extend the next concrete layer upwards according to the above steps on the top of the concrete layer: connecting the steel cage B (19) to the upper ends of the vertical steel bars A (6) at the tops of the plurality of sleeves (9), and making the upper ends of the vertical steel bars B (21) provided on the steel cage B (19) extend out of the top of the spiral steel bars B (20), pouring concrete on the steel cage B (19) according to the above steps, and then filling cement soil after pouring concrete until the second concrete layer is constructed, and using the upper ends of the vertical steel bars B (21) to continue to construct the third concrete layer, forming a staggered arrangement of cement soil layers and concrete layers; Step 13: Laying a road surface on top of the top concrete layer: When the multiple concrete layers are completed and there are no more vertical steel bars extending from the top of the top concrete layer (22), a gravel layer (23) is laid on top of the top concrete layer (22), and a reinforced concrete road surface (24) is laid on top of the gravel layer (23).

2. The construction method of high-fill airport roadbed in mountainous area according to claim 1 is characterized by: When filling cement soil in step 4, a layered compaction construction process is adopted, with each layer being 30-40 cm thick.

3. The construction method of high-fill airport roadbed in mountainous area according to claim 1 is characterized by: The mixing ratio of cement to soil in step 4 is 10-15% cement and 85-90% soil.

4. The construction method of high-fill airport roadbed in mountainous area according to claim 1 is characterized by: In step 5, the height of the sleeve (9) is 40-50 cm.

5. The construction method of high-fill airport roadbed in mountainous area according to claim 1 is characterized by: The fifth "M"-shaped steel bar (10) is multiple and coaxial with the steel cage A (4), the middle of the "M"-shaped steel bar (10) is welded to the steel cage A (4), and the end of the "M"-shaped steel bar (10) is welded to the inner wall of the sleeve (9).

6. The construction method of high-fill airport roadbed in mountainous area according to claim 1 is characterized by: In step 7, the connection method of the square chain (14) and the "X"-shaped chain (13) is hook connection or welding.

7. The construction method of high-fill airport roadbed in mountainous area according to claim 1 is characterized by: In step eight, the multiple connecting chains (15) between each two adjacent chain connecting structures are parallel to each other.

8. The construction method of high-fill airport roadbed in mountainous area according to claim 1 is characterized by: In step nine, when pouring concrete on the plurality of "X"-shaped chains (13), no formwork is used for clamping, so that the "X"-shaped concrete column (16) has a trapezoidal cross-section after being formed.

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