Landslide micro pile wall combined structure

Abstract

The utility model discloses a landslide miniature pile wall combined structure which comprises a plurality of rows of miniature piles, a reinforced concrete ground beam, miniature pile cantilever sections and reinforced concrete breast boards, the lower ends of the plurality of rows of miniature piles extend into a stable sliding bed on the lower portion of a sliding face, and the plurality of rows of miniature piles are divided into front miniature piles, middle miniature piles and rear miniature piles. The pile tops of the front miniature piles and the pile tops of the middle miniature piles are arranged in the reinforced concrete ground beam to be connected in an anchoring mode, the rear miniature piles penetrate through the ground beam to form cantilever sections, the cantilever sections and the reinforced concrete breast boards jointly form a retaining wall structure, and backfill soil behind the wall has the functions of backfilling pressing feet, increasing the self weight of pile groups and reducing the displacement of the pile tops. Cement mortar or fine aggregate concrete is poured into the micro piles, and the micro piles are applied to landslide emergency rescue in deformation and can also be used for common landslide anti-sliding supporting and retaining with small thrust, have the advantages of being rapid in construction and simple in process, and can achieve the purpose of rapidly controlling landslide deformation.

Description

TECHNICAL FIELD

[0001] The utility model belongs to landslide prevention technical field, concretely relates to a landslide micropile wall combination structure. BACKGROUND

[0002] China's terrain is complex and diverse, and the mountainous area is vast, especially in the canyon area with large terrain difference, the slope section of railway, highway and engineering building, affected by rainfall and other inducing factors, landslide and slope instability occur frequently, causing great harm to people's life and property. Micropile is widely used in landslide and slope general engineering reinforcement or emergency rescue engineering because of flexible pile arrangement form, small pile quality, fast, safe and simple construction technology. However, the landslide thrust in emergency rescue is often difficult to accurately predict, and the micropile has low single-pile shear strength due to small cross-sectional area, and the problems of pile body damage caused by excessive thrust and large pile top displacement exist due to small pile quality and large length-diameter ratio. CONTENT OF UTILITY MODEL

[0003] In order to overcome the above-mentioned problems, the inventors of the utility model have made long-term exploration and trial, and many experiments and efforts, and constantly reformed and innovated, and finally provided a landslide micropile wall combination structure, which can be applied to the emergency rescue of landslide in deformation, and also can be used for the landslide resistance of landslide with small thrust, which has the characteristics of fast construction and simple technology, and can achieve the purpose of quickly controlling the deformation of landslide.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows: a landslide micropile wall combination structure is provided. The combination structure comprises multiple rows of micropiles, a reinforced concrete beam, a micropile cantilever section and a reinforced concrete retaining plate. The lower end of the multiple rows of micropiles is deeply inserted into the stable slide bed under the sliding surface. The multiple rows of micropiles are divided into front micropiles, middle micropiles and rear micropiles. The top of the front micropiles and the middle micropiles is inserted into the reinforced concrete beam for anchoring connection. The rear micropiles pass through the beam to form a cantilever section and a reinforced concrete retaining plate to jointly form a retaining wall structure. The backfill soil behind the wall has the functions of backfilling the foot and increasing the weight of the group of piles to reduce the displacement of the top of the pile. The micropiles are filled with cement mortar or fine stone concrete.

[0005] According to the further preferred technical scheme of the utility model, the multiple rows of micropiles are arranged in a triangular shape.

[0006] According to the further preferred technical scheme of the utility model, the row spacing of the adjacent micropiles is 0.8m-1.0m, the column spacing is 1.0m-1.2m, and the micropiles are connected by triangularly arranged beams to enhance the overall stability.

[0007] A further preferred technical solution of the landslide micropile wall combination structure according to the present invention is: a steel rail is installed inside the front micropile, an I-beam is installed inside the middle micropile, and a steel bar bundle is installed inside the rear micropile.

[0008] A further preferred technical solution of the landslide micropile wall combination structure according to the present invention is: the diameter of the front micropile is 150mm to 220mm, and a single 50kg / m to 60kg / m steel rail is inserted after drilling.

[0009] A further preferred technical solution of the landslide micro-pile wall composite structure according to the present invention is that the steel rail is replaced by I-beams or steel bar bundles with a diameter of not less than 25mm.

[0010] A further preferred technical solution of the landslide micropile wall combination structure according to the present invention is: the diameter of the rear micropile is 150mm to 220mm, and a steel bar bundle is inserted after drilling, with the steel bar diameter not less than 25mm.

[0011] A further preferred technical solution of the landslide micropile wall composite structure according to the present invention is: the steel bar bundles are replaced by steel rails or I-beams.

[0012] According to the landslide micropile wall combination structure described in this utility model, a further preferred technical solution is: the rear micropile cantilever section uses a PVC pipe with the same pile diameter as the micropile grouting template and also serves as the outer wall of the pile, with a cantilever section length of 1.5m to 2.0m.

[0013] Compared with the prior art, the technical solution of this utility model has the following advantages / benefits:

[0014] 1. When the landslide thrust is large, this utility model can effectively improve the overall shear resistance of the pile group by setting steel rails in the micropiles, and can also realize the recycling of worn steel rails, or select I-beams or steel bar bundles according to the actual situation to save costs.

[0015] 2. The outer micro-pillar cantilever section of this utility model, together with the reinforced concrete retaining plate, forms a retaining structure, which to a certain extent reduces the investment caused by building a gravity retaining wall and has better economic benefits.

[0016] 3. The backfill soil behind the wall of this utility model utilizes the excavated soil and cut soil generated during pile construction for backfilling and counter-pressure. This not only effectively increases the self-weight of the pile group, but also increases the stability of the landslide due to the backfill counter-pressure. It also effectively utilizes the excavated soil, reducing the transportation of excavated soil and environmental damage.

[0017] 4. The utility model discloses a construction is fast, safe, simple process, need not open up deep ditch, can gain time in emergency rescue engineering. Adopt the steel sleeve pipe and pipe drilling, when the deformation in the hole can not pull out, can be left in the hole and not pull out the pipe, convenient for the insertion of steel rail or reinforcing bar, and the shear capacity is enhanced simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiments, it should be understood that the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0019] Figure 1 It is a structure schematic view of a landslide micro pile wall combined structure of the utility model.

[0020] Figure 2 It is a top view of a landslide micro pile wall combined structure of the utility model.

[0021] The marks in the drawing are as follows: 1. front micro pile 2. middle micro pile 3. rear micro pile 4. ground beam 5. soil retaining plate 6. micro pile cantilever section 7. backfill 8. sliding surface 9. ground surface. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will be clearly and completely described the technical scheme in the embodiments of the utility model, obviously, the described embodiments are a part of the embodiments of the utility model, instead of all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled person in the art without making the creative labor belong to the scope of protection of the utility model. Therefore, the detailed description of the embodiments of the utility model provided below is not intended to limit the scope of the claimed utility model, but only represents the selected embodiments of the utility model.

[0023] It should be noted that: similar signs and letters show similar items in the following drawings, therefore, once an item is defined in one drawing, it can not be further defined and explained in the subsequent drawings.

[0024] Embodiment:

[0025] As Figure 1 Figure 2As shown, a landslide micro pile wall combination structure. Including a plurality of rows of micro piles, reinforced concrete beams 4, micro pile cantilever section 6, reinforced concrete retaining plate 6, the lower end of the plurality of rows of micro piles into the stable slide bed under the lower part of the slide surface 8, the plurality of rows of micro piles are divided into front micro piles 1, middle micro piles 2, rear micro piles 3, the top of the front micro piles 1 and the middle micro piles 2 is anchored and connected into the reinforced concrete beams 4, the rear micro piles 3 pass through the beams to form a cantilever section and the reinforced concrete retaining plate 6 to jointly form a retaining wall structure, the backfill soil 7 behind the wall has the functions of backfilling and increasing the weight of the pile group to reduce the displacement of the pile top, and the micro piles are all grouted with cement mortar or fine stone concrete, and the ground surface 9 is composed of original non-landslide and backfill soil as shown in the figure.

[0026] The plurality of rows of micro piles are arranged in a triangular manner (i.e. staggered between two adjacent rows of micro piles), the row spacing of adjacent micro piles in the plurality of rows of micro piles is 0.8m-1.0m, the column spacing is 1.0m-1.2m, the beams arranged in a triangular manner between the micro piles are connected to enhance the overall stability, in fact, the micro piles are used as nodes, different rows of micro piles are connected to form a diamond grid by using continuous beams, and the same row of beams are also connected by beams to make the diamond grid into a triangular grid.

[0027] The front micro piles 1 are provided with rails inside, the middle micro piles 2 are provided with I-beams inside, and the rear micro piles 3 are provided with steel bars inside. The front micro piles 1 have a pile diameter of 150mm-220mm, and a single 50kg / m-60kg / m rail is placed after hole forming. The rails are replaced by I-beams or steel bars with a diameter of not less than 25mm, the rear micro piles 3 have a pile diameter of 150mm-220mm, and the steel bars are placed after hole forming, and the steel bars have a diameter of not less than 25mm. The steel bars used are replaced by rails or I-beams. The rails, I-beams or steel bars in the micro piles are all used to enhance their strength, so they can be replaced as long as their use requirements are met, and only rails and other tracks with the advantages of convenient operation, recycling and multiple uses are used. It should be noted that the plurality of rows of micro piles actually require more than three rows, and the number of rows of the front micro piles 1, the middle micro piles 2 and the rear micro piles 3 can be adjusted according to actual needs. Generally, the number of rows of each part is equal, but the rear micro piles 3 can also use PVC pipes with the same pile diameter as the micro pile grouting mold and as the outer wall of the pile, the cantilever section is 1.5m-2.0m long, PVC pipes are used as molds for grouting, which is low in cost, convenient and fast in construction, and is conducive to emergency rescue.

[0028] The following example is used to illustrate in detail. A landslide is located in the southwest of Wushan County, with an average horizontal width of 200.0m, an axis length of 320.0m, and a distribution area of 6.4×104m 2, main sliding direction 133°. The fourth system cover layer is 4-12m thick, and the average thickness is about 8.0m, and the square amount is 51.2*104m 3 , which belongs to medium-sized soil landslide. Influenced by continuous rainfall, the deformation of the landslide is aggravated at 5pm the next day, which leads to multiple tensile cracks in the middle and rear of the landslide and the rear edge, and the tensile cracks appear in the walls of the houses on the landslide and the local houses are inclined and deformed, which seriously threatens the safety of nearly 600 people in the town, the bank and the town hospital, and the potential economic loss is about 50 million yuan. In this critical situation, five emergency GPS automatic professional monitoring points are arranged, and the GPS automatic monitoring results are analyzed. The maximum horizontal displacement of the landslide deformation reaches 89.2mm. The first row of piles on the inner side is completed by the rescue team around the 10th day, the deformation of the landslide is slowed down, and the landslide tends to be basically stable. Within 20 days, the rescue team completes three rows of micro-piles, which are front micro-pile 1, middle micro-pile 2 and rear micro-pile 3 (i.e. only one row is arranged in each part) of the multiple rows of micro-piles, respectively. The lower end of the multiple rows of micro-piles is deep into the stable slide bed under the slide surface. The top of the front micro-pile 1 and the middle micro-pile 2 is anchored and connected into the reinforced concrete ground beam 4. The rear micro-pile 3 penetrates the ground beam to form a cantilever section and forms a retaining wall structure with the reinforced concrete retaining plate 6. The backfilling soil behind the wall has the functions of backfilling and pressing the foot and increasing the weight of the group pile to reduce the displacement of the pile top. The micro-pile is filled with cement mortar or fine stone concrete. After the construction of the backfilling soil counter-pressure, the monitoring data rate gradually slows down, and the landslide tends to be stable. The overall construction time is 20 days, and the monitoring data in the first year after completion shows that the deformation of the landslide is basically within the system error range.

[0029] In order to reinforce the landslide, according to the analysis of the monitoring data, emergency rescue engineering measures need to be taken immediately, the micro-pile is 1.0-1.5m above the ground, and the backfilling counter-pressure sandstone bag is used to achieve the purpose of reducing the landslide risk and stabilizing the landslide.

[0030] The utility model is applied to the landslide emergency rescue in deformation, and can also be used for the landslide resistance support of general small thrust, has the characteristics of rapid construction and simple process, and can achieve the purpose of quickly controlling the deformation of the landslide.

[0031] In the description of the utility model, it should be understood that the directions or position relations indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are the directions or position relations shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the devices or elements must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the utility model.

[0032] In the present application, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] The above is only the preferred embodiment of the present application, and it should be pointed out that the above preferred embodiment should not be regarded as limiting the present application, and the protection scope of the present application should be limited by the scope defined by the claims. For ordinary skilled in the art, without departing from the spirit and scope of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A landslide micropile wall composite structure, characterized in that, It includes multiple rows of micropiles, a reinforced concrete ground beam, a cantilever section of the micropiles, and a reinforced concrete retaining wall. The lower ends of the multiple rows of micropiles are inserted into a stable sliding bed under the sliding surface. The multiple rows of micropiles are divided into front micropiles, middle micropiles, and rear micropiles. The tops of the front and middle micropiles are anchored in the reinforced concrete ground beam. The rear micropiles pass through the ground beam to form a cantilever section, which together with the reinforced concrete retaining wall forms a retaining wall structure. The backfill soil behind the wall serves to both fill the backfill foot and increase the self-weight of the pile group to reduce the displacement of the pile top. Cement mortar or fine stone concrete is poured into the micropiles.

2. The landslide micropile wall composite structure according to claim 1, characterized in that, Multiple rows of micropiles are arranged in a triangular pattern.

3. A landslide micropile wall composite structure according to claim 2, characterized in that, The row spacing of adjacent micropiles is 0.8m to 1.0m, and the column spacing is 1.0m to 1.2m. The micropiles are connected by a triangular arrangement of ground beams to enhance the overall stability.

4. The landslide micropile wall composite structure according to claim 1, characterized in that, The front micropiles have steel rails inside, the middle micropiles have I-beams inside, and the rear micropiles have steel reinforcement bundles inside.

5. A landslide micropile wall composite structure according to claim 1, characterized in that, The diameter of the front micropiles is 150mm to 220mm, and after drilling, a single 50kg / m to 60kg / m steel rail is inserted.

6. A landslide micropile wall composite structure according to claim 5, characterized in that, The rails are replaced with I-beams or steel bars with a diameter of not less than 25mm.

7. A landslide micropile wall composite structure according to claim 1, characterized in that, The rear micropiles have a diameter of 150mm to 220mm. After drilling, steel reinforcement bundles are inserted, with a steel reinforcement diameter of not less than 25mm.

8. A landslide micropile wall composite structure according to claim 7, characterized in that, The reinforcing bars are replaced with steel rails or I-beams.

9. A landslide micropile wall composite structure according to claim 1, characterized in that, The rear micropile cantilever section uses PVC pipes of the same diameter as the pile as the micropile grouting template and also serves as the outer wall of the pile. The cantilever section is 1.5m to 2.0m long.

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