阅读说明：本技术 治理危岩体的微型桩+锚索联合支护结构及其施工方法 (Micro pile and anchor cable combined supporting structure for treating dangerous rock mass and construction method thereof ) 是由 蒲黍絛 于 2020-09-22 设计创作，主要内容包括：本发明公开了一种治理危岩体的微型桩+锚索联合支护结构及其施工方法,该结构包括双排布置的微型钢管桩,所述微型钢管桩顶部设置桩顶冠梁,桩顶冠梁将双排桩连接起来使其整体协同受力；微型钢管桩之间设置预制混凝土挡板；同时在微型桩之间设置PVC排水管将危岩体裂隙水引排出来；微型钢管桩与危岩体之间的空隙采用混凝土进行回填处理,使下部危岩体与地面之间充分接触；上部危岩体通过框格梁搭配预应力锚索进行支护处理,对框格梁之间的空隙设置覆土回填,并在覆土中种植草籽进行绿化设计。本发明由于微型桩施工速度快,可以在短时间内对危岩体变形的发展进行初步控制,具有较高效率。(The invention discloses a micro-pile and anchor cable combined supporting structure for treating dangerous rock mass and a construction method thereof, wherein the structure comprises double rows of micro steel pipe piles, the tops of the micro steel pipe piles are provided with pile top crown beams, and the pile top crown beams connect the double rows of piles to ensure that the double rows of piles are integrally stressed in a coordinated manner; precast concrete baffles are arranged among the miniature steel pipe piles; meanwhile, PVC drain pipes are arranged among the micro-piles to drain the fracture water of the dangerous rock mass; the gap between the miniature steel pipe pile and the dangerous rock mass is backfilled by adopting concrete, so that the lower dangerous rock mass is in full contact with the ground; and the upper dangerous rock mass is subjected to supporting treatment by matching the lattice beams with the prestressed anchor cables, gaps between the lattice beams are filled with covering soil and backfilled, and grass seeds are planted in the covering soil for greening design. The invention can initially control the development of dangerous rock mass deformation in a short time due to the high construction speed of the micro-pile, and has higher efficiency.)

1. The utility model provides a administer miniature stake of danger rock mass + anchor rope and unite supporting construction which characterized in that: the steel pipe pile comprises double rows of miniature steel pipe piles (1), wherein a pile top crown beam (4) is arranged at the top of each miniature steel pipe pile (1), and the double rows of piles are connected by the pile top crown beams (4) to enable the double rows of piles to be stressed in a coordinated mode; precast concrete baffles (6) are arranged between the miniature steel pipe piles (1); meanwhile, PVC drain pipes (3) are arranged among the micro-piles to drain the fracture water of the dangerous rock mass; the gap between the miniature steel pipe pile (1) and the dangerous rock mass is backfilled by adopting concrete (2), so that the lower dangerous rock mass is fully contacted with the ground; the upper dangerous rock mass is supported and protected through the frame lattice beams (8) matched with the prestressed anchor cables (7), gaps among the frame lattice beams (8) are filled with soil (9) for backfilling, and grass seeds are planted in the soil (9) for greening design.

2. The micro-pile and anchor cable combined supporting structure for treating dangerous rock masses according to claim 1, is characterized in that: the miniature steel pipe pile (1) comprises a round hollow prefabricated steel pipe pile body with the diameter not larger than 300mm and three built-in steel tendons, and the miniature steel pipe pile (1) extends into the ground to be not smaller than 3 m.

3. The micro-pile and anchor cable combined supporting structure for treating dangerous rock masses according to claim 1, is characterized in that: the size of the section of each lattice beam (8) is 300 multiplied by 300mm or 400 multiplied by 400mm, the distance between the lattice beams (8) is 2.5-3.0 m, the lattice beams are arranged along the slope, and prestressed anchor cables (7) are arranged at the nodes of the lattice beams (8).

4. A construction method of a micro pile and anchor cable combined supporting structure for treating dangerous rock masses is characterized by comprising the following steps:

step 1, in the range of dangerous rock mass to be treated, firstly implementing double rows of miniature steel pipe piles (1) at the lower part, embedding the bottoms of the miniature steel pipe piles (1) into a certain depth range below the ground (5), and arranging pile top crown beams (4) at the tops of the miniature steel pipe piles (1);

step 2, arranging precast concrete baffles (6) among the piles of the miniature steel pipe pile (1), pouring concrete (2) while installing the precast concrete plates (6), and finally arranging PVC drain pipes (3) among the piles for draining fracture water in dangerous rock masses to finally finish the construction of the lower structure of the dangerous rock masses;

step 3, after the construction of the lower part of the dangerous rock mass is finished and the design age is reached, beginning to start the construction of the upper part of the dangerous rock mass, before the construction, removing the impurities including the residues and humus on the surface of the dangerous rock mass, and finishing the slope surface according to a certain slope ratio;

step 4, hanging net spraying and mixing are carried out on the slope, double-layer nets are adopted for meshes, after the hanging net spraying and mixing are completed, a lattice beam (8) and a prestressed anchor cable (7) are implemented, the prestressed anchor cable (7) is anchored at a node of the lattice beam (8), and a drainage hole with a certain depth is formed in the lattice beam (8) and used for draining fractured water in the dangerous rock mass;

and 5, finally, covering soil (9) in the lattice beam (8) for planting grass for greening, thereby achieving the effect of beautifying the environment.

Technical Field

The invention relates to a dangerous rock mass treatment method which can be developed into a landslide, in particular to a micro-pile and anchor cable combined supporting structure for treating dangerous rock masses and a construction method thereof.

Background

Dangerous rock bodies are mostly positioned on steep side slopes or cliffs and are cut by a plurality of groups of structural surfaces, although instability does not occur, the dangerous rock bodies have instability damage conditions, and under the action of external forces such as gravity, weathering force, earthquake, osmotic pressure, external environment vibration interference and the like, the dangerous rock bodies can be separated from parent rocks to cause instability damage, casualties or property loss of people under the dangerous rock bodies can be caused, and the dangerous rock bodies are typical geological disasters. The prior art relates to dangerous rock mass treatment methods which are roughly as follows:

the utility model CN204385752U applied by Chengdu institute of Electrical engineering research and design, Inc. of China discloses a large-scale dumping type dangerous rock mass enclosure structure, which comprises a mother rock mass and a dangerous rock mass; a left anchor rod is arranged on the mother rock body on the left side of the dangerous rock mass, and a right anchor rod is arranged on the mother rock body on the right side of the dangerous rock mass; the device also comprises a pull rope; the pull rope is enclosed on the outer side surface of the dangerous rock body, the left end of the pull rope is connected to the left anchor rod, and the right end of the pull rope is connected to the right anchor rod. According to the scheme, construction on dangerous rock mass is not needed, so that the safety in the construction process can be improved, and meanwhile, the structure is simple, the construction is convenient, and the economic benefit is obvious; and can provide safer construction conditions for further treating dangerous rock bodies in the later period. However, the scheme has single reinforcing treatment measure, when the scale of dangerous rock mass is large or blasting removal cannot be carried out, the treatment effect is often difficult to achieve by adopting a single treatment method, and the safety and stability of the method cannot be guaranteed.

The invention patent CN105672240A applied by Huanghe exploration planning and design Limited company discloses a method for treating dumping destructive type dangerous rock masses, which is based on the 'reverse mechanism' of dangerous rock mass deformation, namely, deformation opposite to the conventional dumping deformation direction is generated, so that the dangerous rock masses have the tendency of inclining to the trailing edge tension fracture, and the inclined dangerous rock masses are righted, thereby increasing the stability coefficient of the dangerous rock masses. However, when the crack of the dangerous rock mass and the development stability of the interlayer are poor, the horizontal hole is formed in the weak layer below the dangerous rock mass, and the construction risk is high.

The utility model discloses a chinese pueraria zhou dam group member limited company's application utility model CN203821418U discloses quick reinforcing apparatus of side slope dangerous rock mass, including diagonal support piece, the diagonal support piece top stretches into in the shallow slot of side slope dangerous rock mass lower surface, and the slotted steel backing plate of diagonal support piece bottom is embedded in the deep trouth of side slope dangerous rock mass below in the channel-section steel backing plate. The shallow grooves and the deep grooves are filled and leveled up by concrete through the cooperation of the oblique supporting piece and the channel steel base plate with the oblique anchor rod, so that the supporting system is fully contacted with the dangerous rock mass, and the aim of quickly reinforcing the side slope dangerous rock mass is fulfilled. However, the maintenance structure adopts a relatively single mode, and the safety and stability of dangerous rock bodies with wide cracks, large scale and complexity are difficult to ensure.

Disclosure of Invention

The invention aims to provide a micro pile and anchor cable combined supporting structure for treating dangerous rock mass and a construction method thereof, and aims to overcome the defects in the prior art.

The invention is realized by the following technical scheme:

the invention relates to a micro-pile and anchor cable combined supporting structure for treating dangerous rock masses, which comprises double rows of micro steel pipe piles, wherein the tops of the micro steel pipe piles are provided with pile top crown beams, and the double rows of piles are connected by the pile top crown beams to enable the double rows of piles to be integrally stressed in a coordinated manner; precast concrete baffles are arranged among the miniature steel pipe piles; meanwhile, PVC drain pipes are arranged among the micro-piles to drain the fracture water of the dangerous rock mass; the gap between the miniature steel pipe pile and the dangerous rock mass is backfilled by adopting concrete, so that the lower dangerous rock mass is in full contact with the ground; and the upper dangerous rock mass is subjected to supporting treatment by matching the lattice beams with the prestressed anchor cables, gaps between the lattice beams are filled with covering soil and backfilled, and grass seeds are planted in the covering soil for greening design.

Furthermore, the miniature steel pipe pile comprises a round hollow prefabricated steel pipe pile body with the diameter not larger than 300mm and three built-in steel tendons, and the miniature steel pipe pile extends into the ground to be not smaller than 3 m.

Furthermore, the size of the section of each sash beam is 300 multiplied by 300mm or 400 multiplied by 400mm, the space between sash beams is 2.5-3.0 m, the sash beams are arranged along the slope, and prestressed anchor cables are arranged at the joints of the sash beams.

The construction method of the micro pile and anchor cable combined supporting structure for treating the dangerous rock mass comprises the following steps:

step 1, in the range of dangerous rock mass to be treated, firstly implementing double rows of miniature steel pipe piles at the lower part, embedding the bottoms of the miniature steel pipe piles into a certain depth range below the ground, and arranging pile top crown beams at the tops of the miniature steel pipe piles;

step 2, arranging precast concrete baffles among the piles of the miniature steel pipe piles, pouring concrete while installing precast concrete plates, and finally arranging PVC drainage pipes among the piles for draining fracture water in dangerous rock masses to finally complete construction of the lower structure of the dangerous rock masses;

step 3, after the construction of the lower part of the dangerous rock mass is finished and the design age is reached, beginning to start the construction of the upper part of the dangerous rock mass, before the construction, removing the impurities including the residues and humus on the surface of the dangerous rock mass, and finishing the slope surface according to a certain slope ratio;

step 4, hanging net spraying and mixing are adopted on the slope, double-layer nets are adopted as net sheets, after the hanging net spraying and mixing are completed, the lattice beams and the prestressed anchor cables are implemented, the prestressed anchor cables are anchored at the nodes of the lattice beams, and drain holes with certain depth are formed in the lattice beams and used for draining fractured water in dangerous rock masses;

and 5, finally, covering soil in the lattice beam for planting grass for greening, thereby achieving the effect of beautifying the environment.

The invention has the beneficial effects that:

(1) because the micro-pile construction speed is fast, the development of dangerous rock body deformation can be preliminarily controlled in a short time, and the micro-pile construction method has higher efficiency. If necessary, time can be strived for the reinforcement treatment of the subsequent dangerous rock mass;

(2) the pile diameter of the miniature pile is small, the design and composition are simple, the requirement on driving equipment is not high, and the miniature pile has good economy;

(3) the dangerous rock mass can be permanently reinforced by the measures of hanging net, spraying and mixing, lattice beams, prestressed anchor cables and water drainage on the upper part of the dangerous rock mass, so that the safety and stability of the dangerous rock mass are ensured;

(4) the lattice beams are covered with soil for planting grass, so as to green the environment and achieve the effect of beautifying the environment.

Drawings

FIG. 1 is a schematic cross-sectional view of the structure of the present invention;

FIG. 2 is a partial overview of the present invention.

Description of reference numerals: 1-miniature steel pipe pile, 2-concrete, 3-PVC drain pipe, 4-pile top crown beam, 5-ground, 6-precast concrete baffle, 7-prestressed anchor cable, 8-frame beam, 9-earthing, 10-dangerous rock original terrain line.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention is implemented as follows: as shown in fig. 1 and 2, a double-row miniature steel pipe pile 1 is designed in a lower dangerous rock mass, and comprises a round hollow prefabricated steel pipe pile body with the diameter not greater than 300mm and three built-in steel tendons, wherein the miniature pile extends into the ground to be not less than 3m so as to ensure that the miniature steel pipe pile 1 has an embedded section with enough length, a pile top crown beam 4 is arranged at the top of the miniature steel pipe pile 1, and the double-row pile is connected to enable the double-row pile to be integrally stressed in a coordinated manner, so that the integral stability is better; precast concrete baffles 6 are arranged among the miniature steel pipe piles 1, the mesh sheets are hung on the precast concrete baffles 6, double layers of reinforcing steel bar meshes are adopted as the mesh sheets, the diameter of the reinforcing steel bar is 8-10mm, and the mark of sprayed concrete is C25 or C30; meanwhile, a phi 90 PVC drain pipe 3 is arranged between the precast concrete baffles 6 to drain the crack water of the dangerous rock mass, so that the crack water of the dangerous rock mass cannot generate excessive water pressure; the gap between the miniature steel pipe pile 1 and the dangerous rock mass is backfilled by C25 or C30 concrete 2, so that the lower dangerous rock mass is fully contacted with the ground, the lower dangerous rock mass is prevented from collapsing and being damaged, and the safety and stability of the lower dangerous rock mass are guaranteed. The upper dangerous rock body is supported and treated through the lattice beams 8 and the prestressed anchor cables 7, the section size of the lattice beams 8 is 300mm multiplied by 300mm or 400mm multiplied by 400mm, the distance between the lattice beams 8 is 2.5-3.0 m, the prestressed anchor cables 7 are arranged at the nodes of the lattice beams 8, the length of the prestressed anchor cables 7 and the prestress application size are comprehensively determined according to the scale of dangerous rock bodies, the crack development degree and other conditions, the anchoring sections of the prestressed anchor cables 7 need to extend into the dangerous rock bodies to be weathered for a certain depth to ensure that the dangerous rock bodies have enough anchoring force, and the outer anchor heads of the prestressed anchor cables 7 and the lattice beams 8 are poured together. And (5) covering soil 9 in gaps between the lattice beams 8 for backfilling, and planting grass seeds for greening design.

The specific construction method comprises the following steps:

step 1, in the range of dangerous rock mass to be treated, firstly implementing a lower double-row miniature steel pipe pile 1, embedding the bottom of the miniature steel pipe pile 1 into a certain depth range below the ground 5, and arranging a pile top crown beam 4 at the top of the miniature steel pipe pile 1;

step 2, arranging precast concrete plates 6 among the piles, pouring concrete 2 while installing the precast concrete plates 6, and finally arranging drain pipes 3 among the piles for draining fracture water in dangerous rock masses to finally finish the construction of the lower structure of the dangerous rock masses;

step 3, after the construction of the lower part of the dangerous rock mass is finished and reaches a certain design age, beginning to start the construction of the upper part of the dangerous rock mass, before the construction, cleaning up residues, humus and the like on the surface of the dangerous rock mass, and finishing the slope surface according to a certain slope ratio;

step 4, hanging net spraying and mixing are adopted on the slope surface, double-layer nets are adopted for meshes, after the hanging net spraying and mixing are completed, lattice beams 8 and prestressed anchor cables 7 are implemented, the anchor cables are anchored at the nodes of the lattice beams 8, and drain holes 3 with certain depth are formed in the lattice beams 8 and used for draining fracture water in dangerous rock masses;

and 5, finally, backfilling soil 9 with a certain thickness in the lattice beam 8 for planting grass for greening to achieve the effect of beautifying the environment.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.