Construction structure and construction method of novel heavy-load temporary road foundation

Abstract

The novel heavy-load temporary road foundation construction structure comprises well points, sand filling pipe bags, geotechnical cloth, medium-coarse sand, graded broken sand and mud stones, the well points are dug and built on a soil roadbed and located on the two sides of a road needing to be built, the sand filling pipe bags are laid on the upper surface of the soil roadbed between the well points on the two sides, the geotechnical cloth is laid on the upper surfaces of the sand filling pipe bags, and the middle-coarse sand is laid on the middle-coarse sand. The medium-coarse sand is laid on the upper surface of the geotechnical cloth, the graded broken sand is laid on the upper surface of the medium-coarse sand, and the mud stone is laid on the upper surface of the graded broken sand. The construction method comprises the following construction steps: firstly, compacting a soil roadbed, performing well point construction on two sides of a road, performing sand filling pipe bag construction at the same time, and performing well point dewatering after a sand filling pipeline is completed; the method comprises the steps that firstly, the compaction degree, elasticity modulus, the compaction degree and deflection of a soil roadbed are detected, then geotextile, medium-coarse sand, graded broken stone and a mud stone surface layer are sequentially laid on a sand filling pipe bag from bottom to top, then the geotextile, the medium-coarse sand, the graded broken stone and the mud stone surface layer are rolled to be dense, then the compaction degree of the medium-coarse sand and the graded broken stone and the deflection of the mud stone surface layer are detected, and finally road shoulder backfilling and slope protection treatment are conducted.

Description

Technical Field

[0001] The invention relates to the technical field of construction of temporary roads for earthwork transportation in coastal reclamation areas, and in particular to a structural design and construction method of a new type of heavy-load temporary road foundation. Background Art

[0002] During the construction of the fourth phase of the Pudong Airport project, in order to solve the problem of earthwork transportation of about 10 million cubic meters, a temporary earthwork transportation road connecting the 3# enclosure and Xingjin Avenue (Jingyi Road) needs to be arranged on the land under the airport's own management. After combining the opinions and suggestions of the expert consultation meeting of the test section, it is necessary to strengthen the construction process, construction methods and quality control of the construction plan to achieve the purpose of optimizing the construction period and reducing resource consumption. Therefore, a new type of road design structure and construction method is needed to solve the problem of ground load-bearing when heavy vehicles are used for transportation. Summary of the invention

[0003] In view of the problems and shortcomings of the prior art, the present invention provides a novel construction structure and construction method for a heavy-load temporary road foundation.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] The present invention provides a novel construction structure of a heavy-load temporary road foundation, which is characterized in that it comprises well points, sand-filled tube bags, geotextiles, medium-coarse sand, graded crushed sand and mud stones, wherein the well points are dug and built on an earth roadbed and are located on both sides of a road to be built, the sand-filled tube bags are laid on the upper surface of the earth roadbed between the well points on both sides, the geotextiles are laid on the upper surface of the sand-filled tube bags, the medium-coarse sand is laid on the upper surface of the geotextiles, the graded crushed sand is laid on the upper surface of the medium-coarse sand, and the mud stones are laid on the upper surface of the graded crushed sand.

[0006] Preferably, the sand-filled tube bag has a double-layer structure, and the laying width of the upper layer is smaller than that of the lower layer.

[0007] Preferably, the sand-filled tube bags, medium-coarse sand, graded crushed sand and mud stones all present a structure that is high in the middle and low on both sides.

[0008] Preferably, the well points are evenly spaced along the extension direction of the constructed road, and two adjacent well points are connected by a well point pipe.

[0009] The present invention also provides a novel heavy-load temporary road foundation construction method, which is characterized in that the construction structure of the novel heavy-load temporary road foundation is constructed according to the following steps:

[0010] S1. After the soil roadbed is compacted, the well point excavation construction is carried out on both sides of the pre-constructed road.

[0011] S2. Laying two layers of the sand-filled pipe bags on the earth roadbed along the extension direction of the pre-built road, and the laying positions are located between the well points on both sides of the excavated pre-built road.

[0012] S3. After the sand-filled tube bags are laid, well point dewatering is performed, and the elastic modulus of the compaction degree of the soil roadbed and the compaction degree and deflection of the sand-filled tube bags are detected.

[0013] S4. Spreading geotextile on the upper surface of the sand-filled tube bag in the upper layer.

[0014] S5. Medium-coarse sand is laid on the upper surface of the geotextile and rolled. After compaction, the deflection of the medium-coarse sand surface layer is detected.

[0015] S6. Laying graded crushed stone on the upper surface of the medium-coarse sand and rolling it. After compacting it, testing the deflection of the graded crushed stone surface layer.

[0016] S7, laying mud stone on the upper surface of the graded crushed stone and rolling it, and after compacting it, detecting the deflection of the mud stone surface layer.

[0017] S8. Backfill the road shoulder with soil and perform slope protection.

[0018] Preferably, the laying widths of the sand-filled tube bags, medium-coarse sand, graded crushed sand and mud stones decrease in sequence.

[0019] The positive and progressive effects of the present invention are:

[0020] The foundation construction structure and construction method adopted by the present invention can achieve the effect of simple, fast and convenient operation procedures during the construction process, and can meet the requirements of earthwork roads, that is, the roadbed bearing capacity must be strong and the stability must be high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional schematic diagram of a heavy-load temporary road foundation according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] like Figure 1As shown, this embodiment provides a novel construction structure of a heavy-load temporary road foundation, including well points, sand-filled tube bags 1, geotextiles 2, medium-coarse sand 3, graded crushed sand 4 and mud stones 5. The well points are dug and built on the earth roadbed 6 and are located on both sides of the road to be built. The sand-filled tube bags 1 are laid on the upper surface of the earth roadbed 6 between the well points on both sides, the geotextile 2 is laid on the upper surface of the sand-filled tube bags 1, the medium-coarse sand 3 is laid on the upper surface of the geotextile 2, the graded crushed sand 4 is laid on the upper surface of the medium-coarse sand 3, and the mud stones 5 are laid on the upper surface of the graded crushed sand 4.

[0024] Among them, the sand-filled tube bag 1, medium-coarse sand 3, graded crushed sand 4 and mud stone 5 all present a structure that is high in the middle and low on both sides. The sand-filled tube bag 1 is a double-layer structure, and the laying width is that the upper layer is smaller than the lower layer.

[0025] Among them, the well points are evenly spaced along the extension direction of the constructed road, and two adjacent well points are connected by well point pipes.

[0026] The present invention also provides a novel construction method of a heavy-load temporary road foundation. The construction structure of the novel heavy-load temporary road foundation is constructed according to the following steps:

[0027] S1. After the soil roadbed 6 is compacted, the well point excavation construction is carried out on both sides of the pre-constructed road.

[0028] S2. Lay two layers of sand-filled pipe bags 1, each 500 mm thick, on the earth roadbed 6 along the extension direction of the pre-constructed road, and the laying position is located between the well points on both sides of the excavated pre-constructed road.

[0029] S3. After the sand-filled tube bag 1 is laid, well point dewatering is performed, and the compaction elastic modulus of the soil roadbed 6 and the compaction and deflection of the sand-filled tube bag 1 are detected.

[0030] S4, paving 200 / m on the upper surface of the sand-filled tube bag 1 on the upper layer 2 Geotextile2.

[0031] S5. Medium-coarse sand 3 is laid on the upper surface of the geotextile 2 and rolled. After compaction, the deflection of the surface layer of the medium-coarse sand 3 is detected.

[0032] S6. Lay 200 mm thick graded crushed stone 4 on the upper surface of the medium-coarse sand 3 and roll it. After rolling and compacting, test the deflection of the surface layer of the graded crushed stone 4.

[0033] S7. Lay 300 mm thick mud stone 5 on the upper surface of the graded crushed stone 4 and roll it. After rolling and compacting, test the deflection of the surface layer of the mud stone 5.

[0034] S8, Backfill the shoulder with 7 backfill soil and perform slope protection.

[0035] Among them, the laying widths of the sand-filled tube bag 1, the medium-coarse sand 3, the graded crushed sand 4 and the mud stone 5 decrease in sequence.

[0036] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A new type of heavy-load temporary road foundation construction structure, characterized in that: It includes well points, sand-filled tube bags, geotextiles, medium-coarse sand, graded crushed sand and mud-stone. The well points are dug and built on the earth roadbed and are located on both sides of the road to be built. The sand-filled tube bags are laid on the upper surface of the earth roadbed between the well points on both sides, the geotextile is laid on the upper surface of the sand-filled tube bags, the medium-coarse sand is laid on the upper surface of the geotextile, the graded crushed sand is laid on the upper surface of the medium-coarse sand, and the mud-stone is laid on the upper surface of the graded crushed sand.

2. The new heavy-load temporary road foundation construction structure as claimed in claim 1 is characterized in that: The sand-filled tube bag has a double-layer structure, and the laying width of the upper layer is smaller than that of the lower layer.

3. The construction structure of the new heavy-load temporary road foundation as claimed in claim 1 is characterized in that: The sand-filled tube bags, medium-coarse sand, graded crushed sand and mud stones all present a structure that is high in the middle and low on both sides.

4. The new heavy-load temporary road foundation construction structure as claimed in claim 1 is characterized in that: The well points are evenly spaced along the extension direction of the constructed road, and two adjacent well points are connected by a well point pipe.

5. A new type of heavy-load temporary road foundation construction method, characterized in that: The construction structure of the new heavy-load temporary road foundation described in claim 1 is constructed according to the following steps: S1. After the soil roadbed is compacted, the well point excavation construction is carried out on both sides of the pre-constructed road. S2. Laying two layers of the sand-filled pipe bags on the earth roadbed along the extension direction of the pre-built road, and the laying positions are located between the well points on both sides of the excavated pre-built road. S3. After the sand-filled tube bags are laid, well point dewatering is performed, and the elastic modulus of the compaction degree of the soil roadbed and the compaction degree and deflection of the sand-filled tube bags are detected. S4. Spreading geotextile on the upper surface of the sand-filled tube bag in the upper layer. S5. Medium-coarse sand is laid on the upper surface of the geotextile and rolled. After compaction, the deflection of the medium-coarse sand surface layer is detected. S6. Laying graded crushed stone on the upper surface of the medium-coarse sand and rolling it. After compacting it, testing the deflection of the graded crushed stone surface layer. S7, laying mud stone on the upper surface of the graded crushed stone and rolling it, and after compacting it, detecting the deflection of the mud stone surface layer. S8. Backfill the road shoulder with soil and perform slope protection.

6. The construction method of the new heavy-load temporary road foundation according to claim 5 is characterized in that: The laying widths of the sand-filled tube bags, medium-coarse sand, graded crushed sand and mud stones decrease in sequence.

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