CN205502063U - Combined type retaining structure - Google Patents

Abstract

The utility model provides a compound retaining structure, which is characterized in that it includes a reinforced concrete pile foundation, a reinforced concrete cap is placed on the top of the reinforced concrete pile foundation to form a high pile cap, and a rigid retaining wall is arranged on the reinforced concrete cap , A retaining board is provided between the reinforced concrete pile foundations. The internal force and displacement of the pile foundation of this structure are larger than that of the buried pile, but the construction does not require the excavation of a deep foundation pit, so this type of support can be applied to temporary slopes with poor stability. At the same time, the retaining structure can reduce the height of the retaining wall. After the earth pressure is segmented, it can achieve the effect of reducing the total earth pressure. It also has the advantages of easy control of construction quality and beautiful effect after completion.

Description

A compound retaining structure

technical field

The utility model relates to a retaining structure, in particular to a composite retaining structure.

Background technique

The retaining structure includes supporting and anchoring structures such as retaining walls, anti-slide piles, and prestressed anchor cables. Used to bear the lateral earth pressure of the soil. In the construction of water conservancy projects, traffic engineering and civil engineering, in order to ensure the safety of the project, the retaining structure must be used for reinforcement. In railway and highway subgrade projects, it is used to stabilize roadbeds, road cuttings, tunnel openings, subgrade slopes at both ends of bridges, etc. In water conservancy, mines, and housing construction projects, it is mainly used to reinforce hillsides, foundation pit slopes and river banks. . When the above projects or other geotechnical projects encounter unfavorable geological disasters such as landslides, collapses, rock piles, falling rocks, and debris flows, the supporting structure is mainly used to reinforce or block unfavorable geological bodies.

Anti-slide piles are piles that pass through the landslide body and go deep into the slide bed to support the sliding force of the slide body and stabilize the slope. It is suitable for shallow and medium-thick landslides and is an anti-slide treatment. main measures. However, it is necessary to be cautious in piling anti-slip on active landslides, so as to avoid sliding caused by disturbance and excavation.

The retaining wall, also known as the retaining wall, can be used to prevent collapse, small-scale landslides and large-scale landslides from sliding again. Its structure includes gravity type, semi-gravity type, cantilever type, buttress type, buttress type, pile Plate and frame, etc. For landslides and collapses with strong slope toe and large allowable bearing capacity, the effect of gravity retaining wall is better. It can be divided into rubble piles, masonry masonry retaining walls, concrete retaining walls, etc. When the sliding surface is exposed at a higher position on the slope and the base of the slope angle is relatively solid, a hollow retaining wall (open hole) is generally used. When the landslide body is thin and has multiple sliding surfaces, the method of graded support can be used. Several other types of retaining walls are generally constructed of reinforced concrete.

The above two retaining structures have limitations when used alone. Therefore, at this stage, many construction projects use a combination of piles and retaining walls, such as:

Pile foundation joist retaining wall: The pile foundation, joist, and retaining wall are under overall force, and the lateral pressure of the soil behind the retaining wall is excavated through open excavation. After the trench is constructed, the pile foundation is constructed, then the joist is constructed, and finally the construction is carried out. retaining wall. However, the amount of construction and excavation is large, the environment is damaged, and the temporary slope is exposed for too long. Once it loses stability, it will cause major safety and quality accidents. Under some special geological conditions, open-cut methods are not allowed, such as landslides, landslides, etc. Red clay section, Xigeda section or soil layer with upper hard and lower soft. In some cases, if the height of the retaining wall is greater than 12 meters, it should not be used if it exceeds the national standard. The actual earth pressure is also far greater than the existing theoretical calculation value, and the safety hazard is great.

Pile-slab retaining wall: After the lateral pressure of the soil passes through the pile-supported retaining wall, a retaining plate is set between the piles. The pile foundation is formed by manual excavation on the original ground, and the non-covered soil section is poured with formwork. However, in the case of a large height difference of the engineering slope, the free end of the pile foundation of this structure is too long, and the lateral deformation of the pile foundation is too large, which is unfavorable to the safety of the pile foundation and the stability of the upper construction site.

How to solve the above problems has become a subject to be studied by engineers.

Contents of the invention

The utility model provides a composite retaining structure, which aims to solve the problems in the prior art, and provides a retaining structure which can not use open excavation or less excavation, and has a small amount of excavation work. The retaining structure can reduce soil retaining The height of the wall can achieve the effect of reducing the total earth pressure after the earth pressure is segmented, and it also has the advantages of easy control of construction quality and beautiful effect after completion.

The technical solution adopted by the utility model to solve the problem is:

A composite retaining structure, including reinforced concrete pile foundations, reinforced concrete pile caps are placed on the top of the reinforced concrete pile foundations to form high pile caps, and rigid retaining walls are arranged on the reinforced concrete pile foundations, between the reinforced concrete pile foundations With retaining board.

The reinforced concrete pile foundations are arranged in at least one row perpendicular to the sliding direction of the soil body.

The soil retaining board is set between the front row of reinforced concrete pile foundations. The method of connection between the soil retaining board and the reinforced concrete pile foundation can be post-planted and anchored, and the surface concrete of the pile foundation can be removed for rigid connection. In addition to setting the soil retaining board between the front row of pile foundations, the soil retaining board can also be placed on the pile foundation and Doma.

The reinforced concrete pile foundation can adopt square pile foundation, circular pile foundation or ellipse pile foundation.

The rigid retaining wall is a gravity retaining wall, a cantilever retaining wall or a buttress retaining wall.

The beneficial effects of the utility model:

1. The reinforced concrete pile foundation and the cap in the retaining structure are formed by pouring. The internal force and displacement of the pile foundation of this structure are larger than that of the buried pile, and the construction does not need to dig deep foundation pits to reduce the temporary slope opening. dig height. It solves the problem of secondary disasters that may be caused by open excavation and construction under special geological conditions, and effectively guarantees the safety of construction personnel and machinery and equipment. Moreover, the pre-reinforcement effect on the unstable ground can be achieved through the pile foundation and cap platform constructed first, which further effectively guarantees the safety of construction.

2. The retaining structure reduces the lateral earth pressure load acting on the retaining structure, reduces the height of the retaining wall, greatly reduces the cross-sectional size of the retaining wall and the excavation volume of earthwork, which can save engineering cost and achieve better economic benefits . At the same time, it reduces the construction difficulty of high retaining walls and avoids the heat of hydration of large-volume concrete, thereby improving the construction quality of the project and shortening the construction period.

3. The reduction of the height of the retaining wall avoids the insecurity caused by the height of the retaining wall exceeding the specification, and at the same time avoids the quality problems that are easy to occur in the construction of high retaining walls.

Description of drawings

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

Fig. 2 is a top view of the utility model.

In the figure: 1. pile foundation, 2. cap, 3. retaining wall, 4. retaining board.

detailed description

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

As shown in Figure 1 and Figure 2, a composite retaining structure includes a reinforced concrete pile foundation 1, and a reinforced concrete cap 2 is placed on the top of the reinforced concrete pile foundation 1 to form a high pile cap, on which the reinforced concrete cap 2 A rigid retaining wall 3 is provided, and an earth retaining board 4 is provided between the reinforced concrete pile foundations 1 .

Wherein the reinforced concrete pile foundation 1 is arranged in at least one row perpendicular to the sliding direction of the soil body. In this embodiment, there are two rows of reinforced concrete pile foundations, and the soil retaining board 4 is arranged between one reinforced concrete pile foundation in the front row, that is, the soil retaining board 4 is arranged between the outer reinforced concrete pile foundations.

The method of connecting the soil retaining board 4 to the reinforced concrete pile foundation 1 can be post-planted for anchorage and rigidly connected after stripping the surface concrete of the pile foundation. Between the foundation and the soil, it can also be placed in the back row of pile foundations under special circumstances.

The reinforced concrete pile foundation 1 can adopt a square pile foundation, a circular pile foundation or an ellipse pile foundation.

The rigid retaining wall 3 can be a gravity retaining wall, a cantilever retaining wall or a buttress retaining wall.

The construction process of the above support and retaining structure is as follows: pile foundation platform arrangement→drilling (digging) the pile hole→put the processed pile foundation reinforcement cage into the hole→pour the pile foundation concrete, and chisel after the concrete strength reaches 85%. Pile head→Install cap bottom formwork and side formwork, bind steel bars and pour cap concrete→After the concrete strength reaches 85%, excavate the soil in front of the pile to reach the required design site elevation (depending on the soil condition, use temporary baffles to support the piles) Soil) → Strip the pile foundation concrete to the design depth, install the soil retaining plate formwork between the pile foundations and bind the steel bars, pour concrete → construct the retaining wall on the cap platform and backfill the earth and stone in layers to the design site elevation.

The utility model is a composite retaining structure formed by the combination of pile foundation, soil retaining board, cap and retaining wall. By setting the reinforced concrete pile foundation, it extends downward to the stable stratum to support the gravity of the cap retaining wall. To support and retain the lateral earth pressure load, a retaining plate is set in the middle of the reinforced concrete pile foundation to support the soil between the pile foundations, and a high pile cap is formed by fixing a reinforced concrete cap on the reinforced concrete pile foundation, thus forming a The pile foundation, soil retaining board, and cap retaining structure resist the lateral earth pressure load and support the retaining wall, place a rigid retaining wall on the reinforced concrete cap, and use the rigid retaining wall to support the lateral earth pressure load.

Compared with the combined retaining structure of pile-cap-retaining wall, the composite retaining structure of the utility model significantly reduces the lateral earth pressure load acting on the retaining structure and reduces the height of the retaining wall, so that The cross-sectional size of the retaining wall and the excavation volume of earth and stone are greatly reduced, which can save the project cost, reduce the construction difficulty of high retaining wall, and avoid the heat of hydration of large-volume concrete, thereby improving the construction quality of the project and shortening the construction period.

The composite retaining structure of the utility model lowers the excavation height of the temporary slope after properly raising the cap, or basically does not excavate, and uses the pile foundation and the cap that were constructed earlier as a temporary retaining wall to achieve pre-reinforcement. The effect is to ensure that the soil between the pile foundations does not slide, the soil before the excavation of the pile foundation is used as a baffle, and finally the retaining wall on the cap platform is backfilled to form a site. The entire construction process and construction process are called The semi-reverse method solves a series of engineering and environmental problems caused by open excavation. It can be used in the construction of unfavorable geology and geology, such as landslide section, red clay section, Xigeda section or soil layer with hard top and soft bottom.

Claims (5)

1. a Composite Braced Retaining Structure, it is characterised in that: include steel bar concrete pile, reinforced concrete pile cap Being placed in steel bar concrete pile top and form high-rise pile cap, reinforced concrete pile cap is provided with rigid retaining wall, Breast boards it is provided with between steel bar concrete pile.

2. Composite Braced Retaining Structure as described in claim 1, it is characterised in that: described steel bar concrete pile The direction being perpendicular to soil body slip is set at least one row.

3. Composite Braced Retaining Structure as described in claim 2, it is characterised in that: breast boards is arranged at front-seat steel Between reinforced concrete pile foundation.

4. Composite Braced Retaining Structure as described in claim 1, it is characterised in that: steel bar concrete pile is permissible Use square pile foundation, circular pile foundation or oval pile foundation.

5. Composite Braced Retaining Structure as claimed in claim 1, it is characterised in that: described rigid retaining wall is gravity Formula retaining wall or cantilever retaining wall or counterfort wall.