CN102926389B - Grouped pile structure for preventing and treating landslide and construction method thereof - Google Patents

Abstract

The invention discloses a grouped pile structure for preventing and treating landslide and a construction method thereof. The grouped pile structure comprises main anti-slide piles and secondary anti-slide piles arranged among the main anti-slide piles; main top beams are poured and connected between every two anti-slide piles; secondary top beams are poured and connected between each secondary anti-slide pile and each of the two neighboring main anti-slide piles; the diameters at the middle parts of the main anti-slide piles are larger than the diameters of the upper parts and the lower parts of the main anti-slide piles; and stirrups at the middle parts of the main anti-slide piles and the secondary anti-slide piles are thickened. The construction method comprises the following steps of: determining the positions of the main anti-slide piles and the secondary anti-slide piles; excavating holes for the main anti-slide piles and the secondary anti-slide piles; respectively presetting steel reinforcement cages of the main anti-slide piles and the secondary anti-slide piles and respectively placing the steel reinforcement cages into corresponding holes, pouring concrete, and carrying out upper hole shrinkage treatment when the concrete is poured on the upper parts of the main anti-slide piles; and finally pouring the main top beams and the second top beams. According to the grouped pile structure and the method, under the premise that distances among piles are not decreased, the extrusion and the damage of earth among the piles can be prevented effectively, and meanwhile, the whole force resistant performance and the anti-slide capability of the anti-slide piles are intensified, and thus the engineering cost is saved.

Description

A pile group structure for preventing and controlling landslides and its construction method

technical field

The invention relates to a pile foundation structure in an underground foundation structure, in particular to a pile group structure for preventing landslides and a construction method thereof, which is suitable for building construction slopes, road slopes and various natural slopes.

Background technique

Affected by natural dynamics such as earthquakes and heavy rainfall, as well as artificial excavation of the slope toe due to actual engineering needs, etc., the slope will become unstable and landslides will occur.

At present, the anti-slide piles used to prevent landslides mainly use a single large-diameter reinforced concrete pile. The parabolic distribution of the two, the inconsistency between the two caused the waste of some materials. In addition, due to the large pile distance of the current anti-slide piles, although the overall stability can be satisfied, the extrusion damage of the soil between the piles occurs from time to time, and reducing the pile distance will greatly increase the project cost and construction period.

Contents of the invention

The invention aims to solve the technical problem that the soil between the anti-slide piles is prone to extrusion damage, and provides a pile group structure and construction method for preventing landslides, which can effectively avoid the piles without reducing the distance between piles. Extrusion damage of soil between piles, thus saving engineering cost.

In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

A pile group structure for preventing landslides, comprising at least one row of main anti-slide piles arranged at intervals on the slope body, and main crown beams are poured and connected between two adjacent main anti-slide piles in the same row; The lower slope of the main anti-slide pile is provided with a secondary anti-slide pile whose diameter is smaller than the main anti-slide pile, and the secondary anti-slide pile corresponds to the middle position between two adjacent main anti-slide piles. A secondary crown beam is poured and connected between the secondary anti-slide pile and the two adjacent primary anti-slide piles;

The diameter of the middle part of the main anti-slide pile is larger than the diameter of the upper part and the lower part, and the main anti-slide pile is provided with longitudinal bars and stirrups, and the stirrups in the middle part of the main anti-slide pile are encrypted; the secondary anti-slide pile Longitudinal bars and stirrups are provided, and the stirrups in the middle of the secondary anti-slide pile are dense.

A green belt is arranged in the triangular area enclosed by the main crown beam and the two corresponding secondary crown beams below it.

The minimum diameter of the main anti-slide pile is 1/2 to 2/3 of its maximum diameter.

The diameter of the secondary anti-slide pile is 1/3 of the maximum diameter of the main anti-slide pile, and the length of the secondary anti-slide pile is 1/3-1/2 of the length of the main anti-slide pile.

The diameter of the longitudinal reinforcement in the secondary anti-slide pile is 4-6 mm less than the diameter of the longitudinal reinforcement in the main anti-slide pile, and the diameter of the stirrup in the secondary anti-slide pile is smaller than the diameter of the stirrup in the main anti-slide pile 2 ~ 4mm.

The distance between the stirrups in the middle of the main anti-slide pile and the secondary anti-slide pile is 1/2 of the distance between the stirrups in other parts.

The side length of the cross-section of the secondary crown beam is 40% to 60% of the side length of the main crown beam.

A construction method utilizing the above-mentioned pile group structure for prevention and control of landslides, comprising the steps of:

(1) Accurately determine the positions of the main anti-slide pile and the secondary anti-slide pile;

(2) The main anti-slide pile shall be excavated manually or by a drilling rig, the upper part and the middle part shall have the same maximum diameter, and the lower part shall be excavated for shrinkage holes;

(3) Drilling of secondary anti-slide piles;

(4) Prefabricate the reinforcement cages of the main anti-slide pile and the secondary anti-slide pile respectively;

(5) Put the prefabricated steel cage of the main anti-slide pile and the reinforcement cage of the secondary anti-slide pile into the drilled holes of the main anti-slide pile and the secondary anti-slide pile respectively, and pour concrete; For the upper part of the anti-slide pile, the diameter of the upper part shall be reduced, and the steel cage of the main anti-slide pile shall be covered with a steel casing with the same shape as the upper part of the main anti-slide pile. Backfilling with natural soil, followed by concrete pouring until the formation of the main anti-slide pile is completed;

(6) Pour the main crown beam and the secondary crown beam. After the pouring is completed, the upper part of the main crown beam and the secondary crown beam will be watered and maintained.

The beneficial effects of the present invention are:

(1) The main anti-slide pile of the present invention can ensure the overall stability of the landslide, and the secondary anti-slide pile can avoid the extrusion damage of the soil between the landslide piles. The main and secondary anti-slide pile structure system can ensure the stability of the landslide. effectively increase the distance between the main anti-slide piles, save engineering costs, and avoid extrusion damage of the soil between the main anti-slide piles;

(2) According to the force of the pile body and the law of force, the present invention changes the traditional design of the pile body with the same diameter at the top and bottom, and adopts a pile body structure with a thick middle and thin sides, which conforms to the force law of the pile body and can resist relative pressure. The larger external force enhances the resistance performance of the pile and can greatly save the project cost;

(3) The main anti-slide piles of the present invention are connected to each other through the main crown beam, and the main anti-slide piles and the secondary anti-slide piles are connected to each other through the secondary crown beam, which is conducive to the formation of the main anti-slide pile and the secondary anti-slide pile The advantages of force, thereby enhancing the overall anti-sliding ability of the anti-slide pile;

(4) The stirrups in the middle of the main anti-slide pile and the secondary anti-slide pile are encrypted, which can enhance the shear resistance and bending resistance of the anti-slide pile, and prevent the anti-slide pile from being damaged;

(5) The green belt used in the present invention can play an aesthetic role.

Description of drawings

Fig. 1 is a schematic plan view of pile group structure provided by the present invention;

Fig. 2 is the structural representation of main anti-slide pile provided by the present invention;

Fig. 3 is a schematic structural view of the secondary anti-slide pile provided by the present invention.

In the figure: 1, the main anti-slide pile; 2, the main crown beam; 3, the secondary crown beam; 4, the secondary anti-slide pile; 5, the green belt; 6, the stirrup; 7, the longitudinal bar.

Detailed ways

In order to further understand the content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

As shown in Fig. 1, the present invention discloses a pile group structure for preventing and controlling landslides, which is composed of a main anti-slide pile 1, a secondary anti-slide pile 4, a main crown beam 2, a secondary crown beam 3 and a green belt.

The main anti-slide piles 1 are arranged in one or more rows on the slope body according to the scale of the landslide and the sliding force. As shown in Figure 2, the shape of the main anti-slide pile 1 is thick in the middle and thin on both sides, and the thick and thin parts can be a smooth transition or a stepped transition, that is, the diameter of the middle part of the main anti-slide pile 1 is larger than the diameter of the upper and lower parts, and its minimum diameter is 1/2 to 2/3 of its maximum diameter.

The main anti-slide pile 1 is provided with longitudinal bars 7 and stirrups 6, the longitudinal bars 7 are evenly arranged along the circumference of the main anti-slide pile 1, and the stirrups 6 are connected with the longitudinal bars 7 through hooks. Among them, the distance between the stirrups 6 in the middle of the main anti-slide pile 1 is smaller than the distance between the stirrups 6 in the upper and lower parts, that is, the distance between the stirrups 6 in the middle is denser; and the distance between the stirrups 6 in the middle is half of the distance between the stirrups 6 in other parts.

The secondary anti-slide piles 4 are arranged on the slope body at a certain distance below the main anti-slide piles 1. The distance is generally within the range of 1-2m. middle position. As shown in Figure 3, the secondary anti-slide pile 4 is a common cylindrical structure, and its diameter and length are respectively smaller than the diameter and length of the main anti-slide pile 1, and the diameter of the secondary anti-slide pile 4 is the maximum diameter of the main anti-slide pile 1. 1/3, the length of the secondary anti-slide pile 4 is 1/3-1/2 of the length of the main anti-slide pile 1.

The secondary anti-slide pile 4 is provided with longitudinal bars 7 and stirrups 6, the longitudinal bars 7 are evenly arranged along the circumference of the secondary anti-slide pile 4, and the stirrups 6 are connected with the longitudinal bars 7 through hooks. The diameter of the longitudinal reinforcement in the secondary anti-slide pile 4 is 4-6mm smaller than the diameter of the longitudinal reinforcement in the main anti-slide pile 1, and the diameter of the stirrup in the secondary anti-slide pile 4 is 2-4mm smaller than the diameter of the stirrup in the main anti-slide pile 1. Among them, the distance between the stirrups 6 in the middle of the secondary anti-slide pile 4 is smaller than the distance between the stirrups 6 in the upper and lower parts, that is, the distance between the stirrups 6 in the middle is denser; and the distance between the stirrups 6 in the middle is half of the distance between the stirrups 6 in other parts.

A main crown beam 2 is poured and connected between two adjacent main anti-slide piles 1 in the same row; a secondary crown beam 3 is poured and connected between each secondary anti-slide pile 4 and two adjacent main anti-slide piles 1 . The main crown beam 2 and the secondary crown beam 3 are formed by pouring concrete, which may be plain concrete beams or reinforced concrete beams. A green belt is arranged in the triangular area surrounded by each main crown beam 2 and the corresponding two secondary crown beams 3 below it, which can play an aesthetic role.

The pile group structure construction method of above-mentioned prevention and control landslide, its concrete steps are as follows:

Use theodolite to accurately determine the positions of the main anti-slide pile 1 and the secondary anti-slide pile 4, and the accuracy must be controlled within the range of 1mm.

Manually carry out the digging work of the main anti-slide pile 1. At the beginning, the diameters of the upper part and the middle part are equally large, which are equal to the thickest diameter of the middle part, and the bottom part carries out shrinkage hole digging. The main anti-slide pile 1 digging method can also be replaced by manual digging to drill holes and then reduce the diameter.

Carry out the drilling of secondary anti-slide pile 4 with rotary drilling rig.

The reinforcement cages of the main anti-slide pile 1 and the secondary anti-slide pile 4 are prefabricated respectively.

Put the prefabricated steel cages of the main anti-slide pile 1 and the secondary anti-slide pile 4 into the drilled holes of the main anti-slide pile 1 and the secondary anti-slide pile 4 respectively, and pour concrete. The strength of the concrete is not less than C15. When pouring to the upper part of the main anti-slide pile 1, the upper part should be reduced in diameter. Specifically, the steel cage of the main anti-slide pile 1 is covered with a steel casing with the same shape as the upper part of the main anti-slide pile 1. The outside of the steel casing The gap between the hole wall and the hole wall is backfilled with slope natural soil, and then concrete pouring is continued until the main anti-slide pile 1 is formed.

The main crown beam 2 and the secondary crown beam 3 are poured, and the concrete strength is not lower than C20. After the pouring is completed, the upper parts of the main crown beam 2 and the secondary crown beam 3 are covered with straw mats for watering and curing for 7 days.

Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art Under the enlightenment of the present invention, without departing from the purpose of the present invention and the scope of protection of the claims, personnel can also make specific changes in many forms, and these all belong to the protection scope of the present invention.

Claims (7)

1. a construction method of preventing and treating the clump of piles structure on landslide, is characterized in that,

The clump of piles structure on this control landslide comprises that at least one row is arranged at intervals at the main antislide pile of slope body, between adjacent two the described main antislide piles with row, builds and is connected with main Guan Liang; On the body of slope, the described main antislide pile bottom of every row, be provided with the inferior antislide pile that diameter is less than described main antislide pile, described antislide pile be corresponding to the centre position between adjacent two described main antislide piles, between described antislide pile and adjacent two described main antislide piles, builds and be connected with time Guan Liang;

The diameter at described main antislide pile middle part is greater than the diameter of upper and lower, and described main antislide pile is provided with vertical muscle and stirrup, and the described stirrup at described main antislide pile middle part is encrypted; Described time antislide pile is provided with vertical muscle and stirrup, and the described stirrup at described antislide pile middle part is encrypted;

This construction method comprises the steps:

(1) accurately determine the position of main antislide pile, inferior antislide pile;

(2) artificial or rig carries out the borehole work of main antislide pile, the thickest equal diameters at top and middle part, and shrinkage cavity borehole is carried out in bottom;

(3) carry out the boring of time antislide pile;

(4) reinforcing cage of the prefabricated main antislide pile of difference and time antislide pile;

(5) by the reinforcing cage of the reinforcing cage of prefabricated main antislide pile and time antislide pile, put into respectively the main antislide pile having bored, the hole of inferior antislide pile, concreting; While being wherein poured into main antislide pile top, carry out top undergauge processing, with the steel sleeve identical with main antislide pile shaped upper part, the reinforcing cage of main antislide pile is entangled, side slope nature earthen backfill for gap between steel sleeve outside and hole wall, then proceed concreting, until complete the moulding of main antislide pile;

(6) build main Guan Liang and time Guan Liang, built rear main Guan Liang and carried out water seasoning with time Guan Liang top.

2. a kind of construction method of preventing and treating the clump of piles structure on landslide according to claim 1, is characterized in that, in the delta-shaped region that two described Guan Liang corresponding to described main Guan Liang and its underpart surround, is provided with greenbelt.

3. a kind of construction method of preventing and treating the clump of piles structure on landslide according to claim 1, is characterized in that, the minimum diameter of described main antislide pile is its maximum gauge 1/2～2/3.

4. a kind of construction method of preventing and treating the clump of piles structure on landslide according to claim 1, is characterized in that, the diameter of described antislide pile is 1/3 of described main antislide pile maximum gauge, and the length of described antislide pile is 1/3～1/2 of described main antislide pile length.

5. a kind of construction method of preventing and treating the clump of piles structure on landslide according to claim 1, it is characterized in that, in described antislide pile, the diameter of vertical muscle is less than the diameter 4～6mm of vertical muscle in described main antislide pile, and in described antislide pile, the diameter of stirrup is less than the diameter 2～4mm of stirrup in described main antislide pile.

6. a kind of construction method of preventing and treating the clump of piles structure on landslide according to claim 1, is characterized in that, the described stirrup spacing that encrypt at described main antislide pile and described antislide pile middle part be described in other parts stirrup spacing 1/2.

7. a kind of construction method of preventing and treating the clump of piles structure on landslide according to claim 1, is characterized in that, the cross section length of side of described Guan Liang is 40%～60% of the described main hat beam section length of side.