CN208934002U - a retaining wall structure - Google Patents

Abstract

The utility model relates to technical field of civil engineering, more particularly, to a kind of barrier wall structure.The native side of facing of the barrier wall structure, including barricade, front-seat bored concrete pile, heel row bored concrete pile and protection-apron, protection-apron is successively arranged front-seat bored concrete pile, antiseepage stake and heel row bored concrete pile, and front-seat bored concrete pile abuts protection-apron vertical section, the immediately preceding row's bored concrete pile of antiseepage stake.The barrier wall structure of the utility model will be usually used in foundation pit supporting construction and retaining wall foundation processing structure conjunctive use, both can guarantee barricade meet antiskid, it is anti-incline, Antiseepage stability and reduce differential settlement, barricade floor elevation can also be lifted, reduce place excavation face.Especially suitable for the narrow situation of soft soil foundation and construction site, the shortcomings that conventional barrier wall structure of constructing on soft soil foundation needs construction surface big (doing water-retaining cofferdam) after wall is effectively overcome.

Description

a retaining wall structure

technical field

The utility model relates to the technical field of civil engineering, in particular to a retaining wall structure.

Background technique

In civil engineering such as water conservancy engineering, shipping engineering, road and bridge engineering, and construction engineering, retaining walls are widely used and have many types, including cantilevered walls, buttressed walls, counterweight walls and sheet pile walls. However, the above-mentioned traditional retaining walls generally need to be constructed on dry ground. For high-height retaining walls, the floor elevation is low, and deep foundation pits need to be excavated; for soft soil areas near rivers and rivers, in order to meet the above requirements, it is often necessary to build high-rise enclosures. Weir, and need to excavate deep foundation pit for foundation pit maintenance. The cost is huge and the construction period is very long, which often leads to the difficulty and investment of the retaining wall as a supporting building exceeding the main project, putting the cart before the horse.

SUMMARY OF THE INVENTION

In order to solve the above problems, the utility model provides a retaining wall structure with small occupied space, small excavation work surface, simple construction and fast construction speed.

The technical scheme adopted by the utility model is: a retaining wall structure, comprising a retaining wall, front row cast-in-place piles and rear row cast-in-place piles arranged at the bottom of the retaining wall for supporting the retaining wall, and a protective tank arranged below the retaining wall , which is characterized in that: the retaining wall is arranged in an L shape, including the bottom plate of the horizontal section and the vertical wall of the vertical section; the protective tank is arranged in an L shape, and the vertical section is located directly below the vertical wall, and is connected with the vertical wall. The front row of cast-in-place piles, the anti-seepage piles and the rear row of cast-in-place piles are arranged in sequence on the soil-facing side of the shield, and the front row of cast-in-place piles are close to the vertical section of the shield , the anti-seepage pile is close to the front row of cast-in-place piles.

Preferably, the lower part of the vertical wall is provided with a drain pipe and an inverted filter prism behind the wall.

Further, the inverting prism body behind the wall is made of crushed stone, medium and coarse sand and non-woven fabric, and the drainage pipe is a PVC pipe of Φ75-100.

Preferably, the front row of cast-in-place piles are arranged in close rows on the air side, and have a diameter of 0.6-1.0 m.

Further, the rear cast-in-place piles are arranged at intervals on the soil-facing side, and have a diameter of 0.6-1.0 m.

Preferably, the anti-seepage pile is a high-pressure jetting pile or a deep stirring pile, and the diameter is 0.5-1.0 m.

Further, the front row of cast-in-place piles, the anti-seepage pile and the rear row of cast-in-place piles extend into the bottom plate of the retaining wall by 0.1m.

A construction method for a retaining wall structure, comprising the following steps:

a. First, organize the construction site and excavate shallowly;

b. Then apply the front row of cast-in-place piles along the soil-facing side of the vertical section of the protective tank, and drive anti-seepage piles along the front row of cast-in-situ piles on the soil-facing side. The safety and stability of the pit requires that 1 to 3 rows of cast-in-place piles be set at intervals;

c. After the construction of the pile foundation is completed and the design strength is achieved, the pile head is removed, the bottom plate of the retaining wall is poured, and the top of the front row of cast-in-place piles, the rear row of cast-in-place piles and the anti-seepage pile is extended into the bottom plate 10cm;

d. After the strength of the reinforced concrete reaches the design requirements, excavate the soil body of the shield part to the design elevation, and pour the shield structure;

e. After the construction of the protective tank is completed, pour the vertical wall of the retaining wall, and then backfill the wall and then fill with soil.

Preferably, in the step e, the vertical wall is provided with 1-2 rows of back-filter prisms and drainage pipes.

The beneficial effects obtained by the utility model are: the front row of cast-in-place piles and the rear row of cast-in-place piles are used to support the retaining wall, the front row of cast-in-place piles are close to the vertical section of the guard, and the front row of cast-in-place piles can bear the pressure conducted by the guard, so the protection Compared with the traditional structure, the thickness of the tank wall can be appropriately reduced; after the construction of the pile foundation is completed and the design strength is reached, the bottom plate of the retaining wall is poured as the pile top crown beam to ensure the integrity of the pile foundation support; there are 1 to 2 rows in the vertical wall Reverse filter prism and drain pipe behind the wall to reduce the pressure of the retaining wall.

The retaining wall structure of the utility model is used in combination with the foundation pit support structure and the retaining wall foundation treatment structure, which can not only ensure that the retaining wall meets the anti-slip, anti-tilt, anti-seepage stability and reduce uneven settlement, but also can lift the retaining wall The elevation of the bottom plate reduces the excavation surface of the site. It is especially suitable for soft soil foundation and the construction site is cramped, which effectively overcomes the disadvantage that the conventional retaining wall structure on soft soil foundation requires a large construction surface behind the wall (as a water retaining cofferdam).

Description of drawings

Fig. 1 is the structural representation of the utility model;

Figure 2 is a schematic diagram of the pile foundation layout.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 1 , a retaining wall structure of the present invention includes a retaining wall 1, a drainage pipe 3, an inverted filter prism 2 behind the wall, a front row of cast-in-place piles 4, a rear row of cast-in-place piles 5, an anti-seepage pile 6 and The protective tank 7 and the retaining wall 1 are arranged in an L shape, including the bottom plate of the horizontal section and the vertical wall of the vertical section. The layout (the left side is the soil-facing side in Figure 1, and the right side is the air-facing side), all of which are arranged at the bottom of the bottom plate of the retaining wall 1, wherein the front row of cast-in-place piles 4 and the rear row of cast-in-place piles 5 are used as the support of the bottom plate of the retaining wall 1, The anti-seepage pile 6 is close to the front row of cast-in-place piles 4, and its main function is to prevent seepage, and can enhance the mechanical properties of the soil between the piles, which is beneficial to the overall stability of the retaining wall 1.

As shown in FIG. 2 , in this embodiment, the front row of cast-in-place piles 4 are arranged in close rows, the rear row of cast-in-place piles 5 are arranged at intervals, and the diameters are both 0.6 to 1.0 m. Prefabricated piles or steel pipe piles can be used instead; the anti-seepage piles 6 are high-pressure rotary jet piles or deep stirring piles, with a diameter of 0.5-1.0 m. The length and spacing of the front row of cast-in-place piles 4, the rear row of cast-in-place piles 5 and the anti-seepage piles 6 should be determined based on comprehensive geological conditions, excavation depth, soil retaining height, groundwater depth and post-construction retaining wall stability requirements. The front row of cast-in-place piles 4, the rear row of cast-in-place piles 5 and the anti-seepage piles 6 extend into the bottom plate of retaining wall 1 for 0.1m.

The protective tank 7 is arranged in an L shape, the vertical section is located directly below the vertical wall and is flush with the vertical wall, and the horizontal section extends to the air side. The protective tank 7 can transmit the pressure received to the front row cast-in-place pile 4, so the pressure on the protective tank 7 itself is greatly reduced, and the wall thickness can also be relatively thinned.

The drainage pipe 3 and the back filter prism 2 are arranged at the lower part of the vertical wall of the retaining wall 1, which can effectively reduce the earth pressure behind the wall. In the embodiment, two rows of drainage pipes 3 and an inverted filter prism 2 behind the wall are arranged at the lower part of the vertical wall of the retaining wall 1, and the inverted filtering prism 2 behind the wall is made of crushed stone, medium and coarse sand and non-woven fabric. 3 Use Φ75～100 PVC pipe.

The construction of pile foundations (front row cast-in-place piles, rear row cast-in-place piles and anti-seepage piles), retaining wall 1 and guard 2 can be carried out according to the following specifications: JGJ 79-2012 Technical Specification for Construction Foundation Treatment, JGJ 94-2008 Construction Pile Foundation Design Specifications, JGJ 106-2003 Technical Specifications for Building Foundation Pile Testing, Drilling and Grouting Construction Regulations DG-TJ 08-202-2007, DLT-5200-2004 Hydropower and Hydraulic Engineering High Pressure Jet Grouting Technology, Foundation Pit Construction Monitoring Regulations (DGTJ08- 2006), technical specification for monitoring of building foundation pit engineering GB 50497-2009, SL 265-2016 sluice design specification, technical specification for foundation pit support JGJ120-2012 and hydraulic concrete structure design specification SL191-2008.

A construction method for a retaining wall structure, comprising the following steps:

a. First, organize the construction site and excavate shallowly;

b. Then, according to the geological conditions, excavation depth, soil retaining height, groundwater depth, foundation pit and post-construction retaining wall stability requirements, set up pile foundations along the side line of the 7th protective tank: Row the cast-in-place piles 4, and drive the anti-seepage piles 6 along the soil-facing side of the front row of cast-in-place piles 4. On the soil-facing side of the anti-seepage piles 6, set 1 to 3 rows of rear rows at intervals according to the size of the bottom plate of the retaining wall 1 and the safety and stability requirements of the foundation pit Cast-in-place pile 5 (two rows of rear-row cast-in-place piles are designed in this embodiment);

c. After the construction of the pile foundation is completed and the design strength is achieved, the pile head is removed, the bottom plate of the retaining wall 1 is poured, and the front row of cast-in-place piles, the rear row of cast-in-place piles and the anti-seepage pile tops are extended into the bottom plate 10cm, and the bottom plate of the retaining wall 1 can be As a pile top crown beam, to ensure the integrity of the pile foundation support;

d. After the strength of the reinforced concrete reaches the design requirements, excavate the soil body of the 7 part of the shield to the design elevation, and pour the 7 structure of the shield;

e. After the construction of the protective tank 7 is completed, pour the retaining wall 1 vertical wall, and then backfill the wall and then fill with soil; in order to reduce the earth pressure behind the wall, it is necessary to set 1 to 2 rows of back filter prisms 2 and PVC according to the height of the fill. Drain pipe 3 (two rows are set in this case).

The basic principles and main structural features of the present invention are shown and described above. The present utility model is not limited by the above-mentioned examples, and without departing from the spirit and scope of the present utility model, the present utility model will also have various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. Inside. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. A retaining wall structure, comprising a retaining wall (1), and front row cast-in-place piles (4) and rear row cast-in-place piles (5) arranged at the bottom of the retaining wall (1) for supporting the retaining wall (1), and The protective tank (7) arranged under the retaining wall (1) is characterized in that: the retaining wall (1) is arranged in an L-shape, including a bottom plate of a horizontal section and a vertical wall of a vertical section; the protective tank (7) ) is arranged in an L shape, the vertical section is directly below the vertical wall, and is flush with the vertical wall, and the horizontal section extends to the air side; (4), an anti-seepage pile (6) and a rear cast-in-place pile (5), the front row of cast-in-place piles (4) is close to the vertical section of the protective tank (7), and the anti-seepage pile (6) is close to the front Row of cast-in-place piles (4). 2 . The retaining wall structure according to claim 1 , characterized in that: the lower part of the vertical wall is provided with a drainage pipe ( 3 ) and a rear filter prism ( 2 ). 3. The retaining wall structure according to claim 2, characterized in that: the back filter prism (2) behind the wall is made of crushed stone, medium and coarse sand and non-woven fabric, and the drain pipe (3) is made of Φ75～100 PVC pipe. 4 . The retaining wall structure according to claim 1 , wherein the front row of cast-in-place piles ( 4 ) are arranged in close rows on the air side, and the diameter is 0.6-1.0 m. 5 . 5. The retaining wall structure according to claim 1, 2 or 4, wherein the rear cast-in-place piles (5) are arranged at intervals on the soil-facing side, and have a diameter of 0.6-1.0 m. 6 . The retaining wall structure according to claim 1 , wherein the anti-seepage pile ( 6 ) adopts a high-pressure rotary jetting pile or a deep stirring pile, and the diameter is 0.5-1.0 m. 7 . 7. The retaining wall structure according to claim 5, wherein the front row cast-in-place piles (4), the rear row cast-in-place piles (5) and the anti-seepage piles (6) extend into the bottom plate of the retaining wall (1) 0.1m.