CN207017097U - Deep super embankment on soft soil - Google Patents

Abstract

The utility model relates to a deep ultra-soft soil embankment, comprising: embankment, cement-soil separation wall, solidified cement-soil in the reinforcement area, solidified cement-soil in the transition area, drainage cushion, cross prefabricated nodes, isolation geotextile, reinforced concrete frame grid , one-word prefabricated joints, ribbed sheet piles and rapid grouting equipment; the ribbed sheet piles pass through the reinforcement area to solidify the cement soil to reach the super soft soil layer, and the ribbed sheet piles are placed vertically at a fixed position on the prefabricated sheet pile foundation Bending towards the connecting rib B as a stress rib of the rib, wherein the rib has a round hole; a rectangular anchoring steel plate and a circular anchoring steel plate are respectively used to anchor the vertical connecting rib A and the vertical connecting rib B as a whole. The beneficial effects of the utility model are: solidified cement soil in the reinforcement area, solidified cement soil in the transition area, rigid piles, and reinforced concrete frame panels, which enhance the overall stress of the roadbed, greatly reduce the uneven settlement of the foundation, and vertical drainage , The drainage cushion effectively solves the foundation drainage problem after construction.

Description

Deep and super soft soil embankment

technical field

The utility model relates to the technical field of expressway engineering and foundation treatment, in particular to deep and ultra-soft soil embankments.

Background technique

In the past 40 years, the settlement and stability of deep and ultra-soft soil foundation embankments have attracted much attention. Due to the complexity of the problem, how to formulate a reasonable foundation treatment plan during the construction process is a thorny problem that plagues the smooth implementation of the project. Most of the coastal embankments are deep and soft soil foundations, which are weak and have almost no hard crust. The microstructure and genetic mechanism of the soil are complex and changeable, and the physical model and its parameters are heterogeneous, anisotropic and uncertain. Highway is a kind of linear belt engineering, and coastal road often passes through different landform units. Facing the complex engineering environment in the coastal areas of Zhejiang, for no hard crust, high water content (ω≥60～100%), high void ratio (e≥1.8～2.0), low shear strength, high sensitivity and low permeability coefficient There are still many deficiencies in the accumulation of technical and engineering data on the deformation characteristics of small and thick (H0≥40～60m) flow plastic silt. Due to the complexity of the engineering environment and the uncertainty of geotechnical properties, the construction of embankments on deep and ultra-soft soil foundations is facing many technical difficulties, the most important of which is to overcome the uneven settlement of roads.

Before the present utility model, China invented "sheet pile composite structure" (patent number: CN101298776A) and provided a kind of sheet pile composite structure, it is characterized in that by reinforced concrete prefabricated pipe pile, reinforced concrete prefabricated baffle, reinforced concrete longitudinal beam and Composed of transverse beams, the structure has good integrity, stability and rigidity. However, this technology still has the problems of large lateral displacement of the embankment and significant uneven settlement, and does not consider the problems of post-construction drainage and soil load around the embankment.

Utility model content

The purpose of this utility model is to solve the above-mentioned deficiencies in the background technology, to provide a kind of deep super soft soil embankment.

In order to achieve the above-mentioned technical purpose, the utility model adopts the following technical solutions:

Deep and ultra-soft soil embankment, including embankment, cement-soil separation wall, solidified cement-soil in the reinforcement area, solidified cement-soil in the transition area, drainage cushion, cross prefabricated joints, isolated geotextiles, reinforced concrete frame panels, one-line prefabricated joints, strips Ribbed sheet pile and rapid grouting equipment; the ribbed sheet pile passes through the reinforcement area to solidify the cement soil to reach the super soft soil layer, and the ribbed sheet pile bends the vertical connecting rib B at a fixed position on the prefabricated sheet pile foundation as a rib There are round holes in the ribs; there are rectangular anchoring steel plates and circular anchoring steel plates respectively used to anchor the vertical connecting rib A and vertical connecting rib B as a whole, and the diameter of the circular anchoring steel plate and the rectangular The side lengths of the anchoring steel plates are all smaller than the diameter of the anchoring groove; the cross prefabricated joints are equipped with prestressed steel bars to form the transverse connecting bars A; the cross prefabricated joints have bottom embedded grooves and top anchoring grooves at the longitudinal and transverse junctions, and the upper part is the top anchoring groove , the lower part is the bottom embedding groove, the diameter of the groove is wider than the diameter of the pipe pile with a hole in the back cover, and the vertical connecting rib is left at the junction A through the hole, and the diameter of the hole is larger than the diameter of the vertical connecting rib A of the pile; The end is provided with drainage pipes and connecting steps, and the transverse connecting ribs A of the prefabricated nodes protrude from the steps to a certain length.

The bottom-sealed pipe pile with holes adopts a bottom-sealed drainage pipe pile, the core is filled with sand or gravel, permeable concrete is used or water-permeable holes are set, and grout holes are set on the pile body.

The isolation geotextile is covered on the drainage cushion and is used to isolate the concrete of the upper construction.

The length of each 1/4 section of the cross prefabricated node is 2.2-2.4m, the depth of the anchoring groove at the top is 30-50mm, and the depth of the embedded groove at the bottom is 30-50mm.

The length of each 1/2 section of the one-word prefabricated node is 2.2-2.4m, and there are prestressed steel bars inside to form horizontal connecting bars B and vertical connecting bars through holes B, and the diameter of the holes is larger than the vertical connecting bars of the pile B's diameter.

The rapid grouting equipment includes: a grouting pipe section without holes, a grouting pipe section with holes, an upper partition, a lower partition and a foam cushion; the upper partition, the lower partition and the grouting pipe are welded together.

The beneficial effects of the utility model are: the separation wall solves the problem of foundation instability caused by surrounding piled soil and groundwater level changes after construction, solidifies the cement soil in the reinforcement area, solidifies the cement soil in the transition area, rigid piles, and reinforced concrete frame panels, The overall stress of the subgrade is enhanced, the uneven settlement of the foundation is greatly reduced, and the vertical drainage body and drainage cushion effectively solve the drainage problem of the foundation after construction.

Description of drawings

Fig. 1 is the structural sectional view of deep supersoft soil embankment of the present utility model and construction method;

Figure 2 is a schematic diagram of a cross prefabricated node;

Fig. 3 is a cross-sectional schematic diagram of prefabricated node A-A;

Fig. 4 is a schematic diagram of a ribbed sheet pile;

Fig. 5 is a schematic cross-sectional view of ribbed sheet pile B-B;

Fig. 6 is a schematic diagram of a word prefabricated node;

Fig. 7 is a schematic diagram of a rectangular anchoring steel plate;

Fig. 8 is a schematic diagram of a circular anchoring steel plate;

Fig. 9 is a schematic diagram of rapid grouting equipment;

Figure 10 is a flow chart of the construction process.

In the figure: 1—embankment, 2—super soft soil layer, 3—soft soil layer, 4—solidified cement soil in the reinforcement area, 5—solidified cement soil in the transition area, 9—bottom-sealing pipe pile with holes, 10—grouting hole, 11—pile side grouting area, 12—drainage cushion, 13—cross prefabricated joint, 14—vertical connecting bar A, 15—bottom embedded groove, 16—top anchoring groove, 17—vertical connecting bar through hole A, 18—core filling at the top of the anchoring groove, 19—post-filling micro-expansion concrete A, 20—rectangular anchoring steel plate, 21—circular anchoring steel plate, 22—through hole of anchoring steel plate, 23—connecting step A, 24—transverse connecting rib A, 25—drainage pipe, 26—isolation geotextile, 27—side ditch, 28—lateral drainage hole, 29—backfilling planting soil, 30—reinforced concrete frame panel, 31—one-word prefabricated node, 32—guardrail, 33— Ribbed sheet pile, 34—vertical connecting bar B, 35—vertical connecting bar through hole B, 36—post-filling micro-expansion concrete B, 37—connecting step B, 38—horizontal connecting bar B, 39—rapid grouting Equipment, 40—grouting pipe section without holes, 41—grouting pipe section with holes, 42—upper partition, 43—lower partition, 44—foam cushion, 45—anchor bolts, 46—prefabricated cover beam.

detailed description

Specific embodiments of the present utility model are described in detail below in conjunction with accompanying drawings.

Fig. 1 is a structural sectional view of a deep ultra-soft soil embankment and construction method of the utility model; Fig. 2 is a schematic diagram of a cross prefabricated node; Fig. 4 is a schematic diagram of a ribbed sheet pile; Fig. 6 is a schematic diagram of a one-word prefabricated node. The deep ultra-soft soil embankment and its construction method are shown. The deep ultra-soft soil embankment and its construction method mainly include embankment 1, solidified cement soil in the reinforcement area 4, solidified cement soil in the transition area 5, bottom-sealing pipe piles with holes 9, and drainage pads Layer 12, cross prefabricated nodes 13, isolated geotextiles 26, reinforced concrete frame panels 30, straight prefabricated nodes 31, ribbed sheet piles 33, rapid grouting equipment 39; Cover beam 46 is connected as a whole.

The deep and ultra-soft soil embankment of this embodiment includes embankment 1, cement-soil separation wall 6, solidified cement-soil 4 in the reinforcement zone, solidified cement-soil 5 in the transition zone, drainage cushion 12, cross prefabricated node 13, isolation geotextile 26, steel bars Concrete frame panels 30, prefabricated joints 31, ribbed sheet piles 33 and rapid grouting equipment 39; the ribbed sheet piles 33 pass through the reinforcement area to solidify the cement soil 4 to reach the super soft soil layer 2, and the ribbed sheet piles 33 On the prefabricated sheet pile foundation, bend the vertical connecting rib B34 at a fixed position as the stress rib of the rib, wherein the rib has a round hole; a rectangular anchoring steel plate 20 and a circular anchoring steel plate 21 are respectively used to connect the vertical The connecting bar A14 and the vertical connecting bar B34 are anchored as a whole, and the diameter of the circular anchoring steel plate 21 and the side length of the rectangular anchoring steel plate 20 are both smaller than the diameter of the anchoring groove; the cross prefabricated node 13 is provided with prestressed steel bars to form a horizontal connecting bar A24; The cross prefabricated node 13 has a bottom embedding groove 15 and a top anchoring groove 16 at the longitudinal and transverse intersections, the upper part is the top anchoring groove, and the lower part is the bottom embedding groove. There is a through hole A17 for the vertical connecting rib, and the diameter of the hole is greater than the diameter of the vertical connecting rib A14 of the pile; the cross prefabricated node is provided with a drainage pipe 25 and a connecting step 23 at the end, and the horizontal connecting rib A24 of the prefabricated node is connected from the step. stick out a certain length.

The bottom-sealed pipe pile 9 with holes adopts a bottom-sealed drainage pipe pile, the core is filled with sand or gravel, and permeable concrete is used or a water-permeable hole is set, and a grout hole 10 is set on the pile body.

The isolation geotextile 26 covers the drainage cushion and is used to isolate the concrete of the upper construction.

The length of each 1/4 section of the cross prefabricated node 13 is 2.2-2.4m, the depth of the anchoring groove at the top is 30-50mm, and the depth of the embedded groove at the bottom is 30-50mm.

The length of each 1/2 section of the one-word prefabricated node 31 is 2.2-2.4m, and the interior is equipped with prestressed steel bars to form horizontal connecting bars B38 and vertical connecting bars through holes B35. The diameter of the holes is larger than the vertical connection of piles. The diameter of the rib B34.

The rapid grouting equipment 39 comprises: a grouting pipe section 40 without holes, a grouting pipe section 41 with holes, an upper partition 42, a lower partition 43 and a foam cushion 44; the upper partition 42, the lower partition 43 Welded together with the grouting pipe.

The construction process of the above-mentioned deep ultra-soft soil embankment and construction method mainly includes the following steps:

1. For site cleaning, the humus, topsoil, and turf on the ground surface should be cleaned within the road width;

2. Construction of the separation wall: Ribbed sheet piles 33 are driven into the ultra-soft soil layer 2 and soft soil layer 3, and the inline prefabricated nodes 31 are installed, and the vertical connecting ribs B34 and anchor bolts 45 are anchored and connected as a whole by using rectangular anchoring steel plates 20 . Use post-filling micro-expansion concrete B36 to seal the hole. Excavate trenches according to the size of the prefabricated cover beam 46 to bind and link the transverse connecting ribs B to form a prefabricated cover beam 46 with a certain strength and overall structure to form a whole to resist the lateral earth pressure generated by the surrounding soil;

3. Solidify the cement-soil construction in the reinforcement area and move forward, using a series of physical and chemical reactions between the curing agent and the super-soft soil to harden the soft soil into a high-quality foundation with integrity, water stability and certain strength;

4. Solidify the cement soil in the transition zone 5. Consolidate the cement soil in the reinforcement zone 4. Construction and advance, use a series of physical and chemical reactions between the curing agent and the super soft soil to make the soft soil harden into an integrity and water stability and a high-quality foundation with a certain strength;

5. Construction of the foundation pile: before the cement is solidified, drive the bottom-sealed pipe pile 9 with holes, and after 48 hours, grout with rapid grouting equipment. Utilize the machine to insert the rapid grouting equipment 39 grouting into the bottom-sealed pipe pile 9 with holes, slowly push the belt inward and stop the insertion when it reaches the position of the designated grouting hole 10, inject the grout into the grouting pipe section 40 without holes, Because the upper partition 42, the lower partition 43, the foam cushion 44 are attached to the inner wall of the pipe pile 9 with holes, the cement slurry is discharged from the grouting pipe section 41 with holes to form a pile side grouting area. Then lift up successively, stop when reaching next grout hole 10 positions, lift up, inject grout, operate successively.

6. Excavate the trench according to the size of the reinforced concrete frame slab 30;

7. Lay drainage cushion 12 and compact it;

8. Lay an isolation geotextile 26 on the top of the drainage cushion 12 to isolate the upper soil;

9. Install the cross prefabricated node 13, and use the circular anchor steel plate 20 to anchor the vertical connecting rib A14 anchor bolt 45 into a whole. Use post-filling micro-expansion concrete A19 to seal the hole. Anchor the vertical connecting rib A14 into a whole;

10. Bind or weld the horizontal connecting bars A24 with steel bars, and pour the reinforced concrete frame panels 30;

11. After the reinforced concrete frame slab reaches 70% to 80% of the design strength, carry out embankment 1 filling and follow-up side ditch 27, lateral drainage hole 28, backfill planting soil 29, and guardrail 32 construction.

Claims (6)

1. a kind of deep supersoft soil embankment is characterized in that, comprises embankment (1), cement-soil separation wall (6), reinforcement zone solidifies cement-soil (4), transition zone solidifies cement-soil (5), drainage cushion ( 12), cross prefabricated joints (13), isolation geotextiles (26), reinforced concrete frame panels (30), straight prefabricated joints (31), ribbed sheet piles (33) and rapid grouting equipment (39); The ribbed sheet pile (33) passes through the reinforcement area to solidify the cement soil (4) to reach the supersoft soil layer (2), and the ribbed sheet pile (33) connects the vertical connecting rib B at a fixed position on the prefabricated sheet pile foundation. (34) Bending the stressed tendons as ribs, wherein the ribs have circular holes; rectangular anchoring steel plates (20) and circular anchoring steel plates (21) are respectively used to connect the vertical connecting ribs A (14), vertical The connecting bar B (34) is anchored as a whole, and the diameter of the circular anchoring steel plate (21) and the side length of the rectangular anchoring steel plate (20) are both smaller than the diameter of the anchoring groove; the cross prefabricated node (13) is provided with prestressed reinforcement inside to form a transverse connection Rib A (24); the cross prefabricated node (13) has a bottom embedded groove (15) and a top anchor groove (16) at the longitudinal and transverse junctions, the upper part is the top anchor groove, the lower part is the bottom embedded groove, and the diameter of the groove is wide According to the diameter of the pipe pile with hole back cover (9), there is a vertical connecting rib through hole A (17) at the junction, and the diameter of the hole is greater than the diameter of the vertical connecting rib A (14) of the pile; the cross prefabricated node is at the end A drainage pipe (25) and a connecting step (23) are provided, and the transverse connecting rib A (24) of the prefabricated node protrudes a certain length from the step. 2. The deep ultra-soft soil embankment according to claim 1, characterized in that, the bottom-sealing pipe pile with holes (9) adopts a bottom-sealing drainage pipe pile, fills the core with sand or gravel, and adopts permeable concrete or sets a water-permeable Holes are provided with grout holes (10) at the pile body. 3. The deep ultra-soft soil embankment according to claim 1, characterized in that, the isolation geotextile (26) covers the drainage cushion and is used to isolate the concrete of the upper construction. 4. The deep ultra-soft soil embankment according to claim 1, characterized in that, the length of each 1/4 section of the cross prefabricated node (13) is 2.2-2.4m, the top anchoring groove is 30-50mm deep, and the bottom embedded groove is deep 30-50mm. 5. The deep ultra-soft soil embankment according to claim 1, characterized in that, the length of each 1/2 section of the one-shaped prefabricated node (31) is 2.2-2.4m, and prestressed steel bars are arranged inside to form a transverse The connecting rib B (38), the vertical connecting rib runs through the hole B (35), and the diameter of the hole is greater than the diameter of the vertical connecting rib B (34) of the pile. 6. The deep ultra-soft soil embankment according to claim 1, characterized in that, the rapid grouting equipment (39) comprises: a grouting pipe section without holes (40), a grouting pipe section with holes (41), an upper A partition (42), a lower partition (43) and a foam cushion (44); the upper partition (42), the lower partition (43) and the grouting pipe are welded together.