CN112144551A - Secondary reinforcement old side slope structure and construction method - Google Patents
Secondary reinforcement old side slope structure and construction method Download PDFInfo
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- CN112144551A CN112144551A CN202011051328.8A CN202011051328A CN112144551A CN 112144551 A CN112144551 A CN 112144551A CN 202011051328 A CN202011051328 A CN 202011051328A CN 112144551 A CN112144551 A CN 112144551A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0266—Retaining or protecting walls characterised by constructional features made up of preformed elements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0275—Retaining or protecting walls characterised by constructional features cast in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a secondary reinforcement old side slope structure and a construction method, and relates to the technical field of side slope treatment. The secondary reinforcement old side slope structure provided by the invention comprises an old side slope, an old protection structure and a prefabricated lattice beam arranged on the outer side of the old protection structure; the prefabricated lattice beam is anchored on the old side slope through a fiber reinforced composite anchoring system; concrete baffles are filled between the prefabricated lattice beams. The secondary reinforced old slope structure provided by the invention has the advantages of reasonable stress, good anchoring performance and small construction damage, and can improve the durability, safety and stability of slope engineering and ensure the secondary treatment effect.
Description
Technical Field
The invention relates to the technical field of slope treatment, in particular to a secondary reinforcement old slope structure and a construction method.
Background
With the large-scale construction of infrastructures such as high-speed railways, highways, water conservancy and hydropower, a large number of high geotechnical slopes appear, the safety problems of various engineering in construction and operation are increasingly highlighted, and the safety and durability of slope engineering in various disaster environments are greatly tested. The slope reinforcement engineering is one of the important measures for improving the integral stability of the slope. Traditional soil nail is consolidated, lattice beam consolidates, knee wall is consolidated and stock reinforcement system is generally made by materials such as reinforcing bar, concrete or shaped steel, and these materials are perishable, can not used repeatedly, and the durability is poor, the extravagant resource, easily causes environmental pollution, consequently, seeks a novel and advanced reinforceing system and is imperative. Compared with steel products, the fiber reinforced composite material has attracted much attention in civil engineering because of its low construction cost, high tensile strength, high corrosion resistance, low relaxation, high electromagnetic interference resistance, etc. The glass fiber composite material is adopted in the slope reinforcement project, so that steel can be saved, the environment is protected, the corrosion problem of the components can be fundamentally solved, the operation and maintenance cost of the structure is reduced, and the service life of the structure is prolonged.
However, after some side slopes are reinforced, due to the deterioration of environmental conditions, under the influence of factors such as engineering loading, rainwater infiltration and earthquakes, the materials of the side slopes gradually deteriorate, so that the retaining structure deforms or even loses efficacy, such as cracking and sliding of a retaining wall, deformation and collapse of an anti-slide pile, deformation and dislocation of an anchor rod frame, failure of an anchor rod and the like, and further normal use performance of the structure is influenced, the saturation of the soil body of the side slope is increased under the extreme rainfall condition, and the instability and damage of the side slope supporting structure are possibly caused due to the increase of the expansive force of the soil body.
And (4) carrying out secondary reinforcement (reinforcement) on the side slope which is dangerous after treatment according to the deformation conditions of the side slope and the treatment engineering structure. Influenced by the layout of the main engineering in the early stage, the available space for secondary reinforcement is limited, and larger construction disturbance is not suitable to be generated. Therefore, the anchoring technology which is reasonable in stress, good in anchoring performance, small in construction damage and strong in adaptability to terrain conditions is the best choice for secondary reinforcement of the slope body and the original treatment engineering structure.
From present engineering practice, the theoretical research of retaining wall structure reinforcement lags behind the engineering practice relatively, and lacks the trade norm at present and guides retaining wall structure reinforcement, and this provides objective degree of difficulty just to select for retaining wall structure reinforcement scheme, and what common secondary reinforcement mode adopted still is that soil nail is consolidated, lattice beam is consolidated, knee wall is consolidated, stock is consolidated etc..
Although the secondary reinforcement technology can play a certain role in the treatment of old slopes, the secondary reinforcement technology is similar to the primary reinforcement technology in nature. In addition, secondary reinforcing measures such as soil nail reinforcing, lattice beam reinforcing, supporting wall reinforcing and anchor rod reinforcing can generate certain construction disturbance on the old side slope, the required working space is large, and after rainfall infiltration in the later period, the durability of the soil nail, the lattice beam, the supporting wall and the anchor rod can still be threatened, and the soil nail, the lattice beam, the supporting wall and the anchor rod can still lose efficacy in a short time to influence the secondary reinforcing effect.
Disclosure of Invention
The secondary reinforcement old side slope structure provided by the invention has the advantages of reasonable stress, good anchoring performance and small construction damage, and can improve the durability, safety and stability of side slope engineering and ensure the secondary treatment effect.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a secondary reinforcement old side slope structure, which comprises an old side slope, an old protective structure and prefabricated lattice girders arranged on the outer side of the old protective structure; the prefabricated lattice beam is anchored on the old side slope through a fiber reinforced composite anchoring system; concrete baffles are filled between the prefabricated lattice beams.
Preferably, the secondary reinforcement old side slope structure further comprises a plurality of drainage holes, and the drainage holes penetrate through the old protective structure and the concrete baffle; coarse sand is filled in the water drainage holes.
Preferably, the old protection structure is a soil nail reinforcing system, a lattice beam reinforcing system, a support wall reinforcing system or an anchor rod reinforcing system.
Preferably, the prefabricated lattice beam is one or more of L-shaped, T-shaped and cross-shaped; the prefabricated lattice beam is composed of a plurality of sections of lattice beams, and the connecting end between two adjacent sections of lattice beams is spliced with the steel bar jack through a steel bar plug.
Preferably, a steel mesh is arranged inside the concrete baffle.
Preferably, the connecting ends between the prefabricated lattice beams and the concrete baffle are inserted into the steel bar jacks through steel bar plugs.
Preferably, the fiber reinforced composite anchoring system comprises a fiber reinforced composite anchor rod, an anchor hole, a drilling hole, a nut, a steel base plate, an anchor inclined support, a concrete seal anchor, a centering bracket and a grouting body; the anchor holes are arranged at the corners of the prefabricated lattice beams; the drilling hole is arranged on the old side slope and is aligned with the anchor hole; one end of the fiber reinforced composite anchor rod is inserted into the drilled hole, and the other end of the fiber reinforced composite anchor rod penetrates out of the anchor hole; the anchor inclined support, the steel base plate and the nut are sequentially arranged on the outer side of the prefabricated lattice beam and used for fixing the fiber reinforced composite anchor rod; the concrete seal anchor seals the steel base plate and the nut; the centering bracket is arranged between the fiber reinforced composite anchor rod and the drill hole; the interior of the bore hole is filled with a grout.
Preferably, the old side slope is a soil side slope or a rock side slope; and the slope angle of the old slope is 0-90 degrees.
The invention also provides a construction method for secondarily reinforcing the old side slope, which comprises the following steps:
according to the structure of the technical scheme, the prefabricated lattice beams are installed on the outer side of the old protective structure, concrete baffles are filled between the prefabricated lattice beams, and the prefabricated lattice beams are anchored on the old side slope by using a fiber reinforced composite anchoring system.
Preferably, the method of forming the fibre-reinforced composite anchoring system comprises the steps of:
arranging a drill hole on the old slope, wherein the depth of the drill hole is determined according to the design length of the fiber reinforced composite anchor rod, and an ultra-drilling section with a certain length is reserved;
inserting one end of a fiber reinforced composite anchor rod into the drill hole, and injecting cement mortar into the drill hole to form a grouting body;
the method comprises the steps of arranging anchor holes and concrete baffles on a prefabricated lattice beam, aligning the anchor holes with drilled holes, enabling the other end of a fiber reinforced composite anchor rod to penetrate through the anchor holes, sequentially arranging an anchor inclined support, a steel base plate and a nut on the outer side of the prefabricated lattice beam, and sealing the steel base plate and the nut by utilizing concrete sealing anchors to form a fiber reinforced composite material anchoring system.
The invention provides a secondary reinforcement old side slope structure, which comprises an old side slope, an old protective structure and prefabricated lattice girders arranged on the outer side of the old protective structure; the prefabricated lattice beam is anchored on the old side slope through a fiber reinforced composite anchoring system; concrete baffles are filled between the prefabricated lattice beams. The prefabricated lattice beam and the concrete baffle are additionally arranged on the outer side of the old protective structure, so that the disturbance of secondary reinforcement construction on the supporting and retaining structure of the old side slope is reduced; and the prefabricated lattice beam is fixed by using a fiber reinforced composite material anchoring system to form a secondary reinforcing structure of the old slope, which has reasonable structural stress, good anchoring performance and small construction damage. The fiber reinforced composite material is used for replacing steel bars, steel pipes, steel strands and the like in the anchoring system to form the fiber reinforced composite material anchoring system, so that the slope retaining wall, the anti-slide pile and the anchor rod frame can be prevented from further cracking, sliding and instability, the durability, the corrosion resistance, the safety and the stability of slope engineering are improved, steel can be saved, the environment is protected, the component corrosion problem can be fundamentally solved, the operation and maintenance cost of the structure is reduced, the service life of the structure is prolonged, and the secondary treatment effect is ensured.
Drawings
FIG. 1 is an elevation view of a secondary reinforced old slope structure in an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a secondary reinforced old slope structure in an embodiment of the present invention;
FIG. 3 is a schematic view of "L" -shaped, "T" -shaped, and "cross" -shaped lattice beams;
FIG. 4 is a schematic view of the connection of the sections of lattice beams in the prefabricated lattice beam;
FIG. 5 is a schematic view of a fiber-reinforced composite anchoring system;
FIG. 6 is a cross-sectional view taken along line I-I of FIG. 5;
FIG. 7 is a schematic view of the connection of the precast lattice beams to the concrete dam;
the concrete side slope comprises an old side slope 1, a prefabricated lattice beam 2, a fiber reinforced composite anchoring system 3, an old protective structure 4, a water drainage hole 5, a reinforcing mesh 6, an anchor inclined support 7, a steel backing plate 8, a nut 9, a concrete seal anchor 10, a fiber reinforced composite anchor rod 11, a centering bracket 12, cement mortar 13, an ultra-drilling section 14, a drilling hole 15, a grouting pipe 16, an anchor bar 17, a concrete baffle 18, an anchor hole 19, a section of lattice beam 20, a reinforcing steel bar jack 21, a reinforcing steel bar plug 22, an embedded reinforcing steel bar 23, a corrugated steel pipe 24, a seam 25 and a connecting agent 26.
Detailed Description
The invention provides a secondary reinforcement old side slope structure, which comprises an old side slope, an old protective structure and prefabricated lattice girders arranged on the outer side of the old protective structure; the prefabricated lattice beam is anchored on the old side slope through a fiber reinforced composite anchoring system; concrete baffles are filled between the prefabricated lattice beams.
The secondary reinforcement old side slope structure provided by the invention comprises an old side slope. In the invention, the old side slope is preferably a soil side slope or a rock side slope; the slope angle of the old slope is preferably 0-90 degrees.
The secondary reinforcement old side slope structure provided by the invention comprises an old protection structure arranged on the old side slope. In the present invention, the old protective structure is preferably a soil nail reinforcing system, a lattice beam reinforcing system, a supporting wall reinforcing system or a bolt reinforcing system. The invention has no special requirements on the soil nail reinforcing system, the lattice beam reinforcing system, the supporting wall reinforcing system and the anchor rod reinforcing system, and can adopt the reinforcing system which is well known by the technical personnel in the field.
The secondary reinforcement old slope structure provided by the invention comprises a prefabricated lattice beam arranged on the outer side of the old protective structure. In the invention, the prefabricated lattice beam is preferably one or more of an L shape, a T shape and a cross shape, and the prefabricated lattice beam is preferably prefabricated in a factory and is fabricated on site in an assembly mode. In the invention, the corners of the prefabricated lattice beams are provided with anchor holes, and the diameters of the anchor holes are preferably 100-150 mm.
In the invention, the prefabricated lattice beam preferably comprises a plurality of sections of lattice beams, the length of each section of lattice beam is preferably 1500-3000 mm, the width of each section of lattice beam is preferably 200-600 mm, and the height of each section of lattice beam is preferably 200-600 mm. In the invention, the connecting ends between two adjacent sections of lattice beams are preferably inserted with the steel bar jacks through steel bar plugs; the steel bar insertion holes are preferably formed by corrugated steel pipes, gaps between the corrugated steel pipes and the steel bar plugs are preferably filled with connecting agents, and joints between two adjacent sections of lattice beams are preferably filled with the connecting agents. The present invention does not require any particular composition of the linking agent, and may employ linking agents known to those skilled in the art.
In the invention, concrete baffles are filled between the prefabricated lattice beams, and concrete baffles are filled in the lattices of the prefabricated lattice beams. In the invention, the concrete baffle is preferably constructed in an assembly mode, the length of each concrete baffle is preferably 1500-3000 mm, the width of each concrete baffle is preferably 1500-3000 mm, and the height of each concrete baffle is preferably 200-300 mm. In the invention, a reinforcing steel bar mesh is arranged inside the concrete baffle, and the diameter of reinforcing steel bars in the reinforcing steel bar mesh is preferably 14-22 mm.
In the invention, the connecting end between the prefabricated lattice beam and the concrete baffle is preferably spliced with the steel bar jack through a steel bar plug; the steel bar insertion holes are preferably formed by corrugated steel pipes, gaps between the corrugated steel pipes and the steel bar plugs are preferably filled with connecting agents, and joints between the prefabricated lattice beams and the concrete baffles are preferably filled with the connecting agents.
The secondary reinforcement old slope structure preferably further comprises a plurality of drainage holes, and the drainage holes penetrate through the old protective structure and the concrete baffle; coarse sand is filled in the water drainage holes. In the invention, the drainage holes are preferably arranged in a plum blossom shape by adopting a PVC pipe, the inner diameter of the PVC pipe is preferably 20-30 mm, and the vertical distance between every two adjacent drainage holes is preferably 1500-2000 mm; the depth of the drain hole inserted into the old side slope is preferably 400-600 mm. In the invention, the particle size of the coarse sand is preferably 3-15 mm. According to the invention, the coarse sand is filled in the drainage hole to form the inverted filter layer.
The secondary reinforcement old slope structure further comprises a fiber reinforced composite material anchoring system for anchoring the prefabricated lattice beam on the old slope. In the invention, the fiber reinforced composite material anchoring system preferably comprises a fiber reinforced composite anchor rod, an anchor hole, a drilling hole, a nut, a steel base plate, an anchor inclined support, a concrete seal anchor, a centering bracket and a grouting body; the anchor holes are arranged at the corners of the prefabricated lattice beams; the drilling hole is arranged on the old side slope and is aligned with the anchor hole; one end of the fiber reinforced composite anchor rod is inserted into the drilled hole, and the other end of the fiber reinforced composite anchor rod penetrates out of the anchor hole; the anchor inclined support, the steel base plate and the nut are sequentially arranged on the outer side of the prefabricated lattice beam and used for fixing the fiber reinforced composite anchor rod; the concrete seal anchor seals the steel base plate and the nut; the centering bracket is arranged between the fiber reinforced composite anchor rod and the drill hole; the interior of the bore hole is filled with a grout.
In the invention, the material of the fiber reinforced composite anchor rod preferably comprises one or more of carbon fiber reinforced polymer, aramid fiber reinforced polymer and glass fiber reinforced polymer; the diameter of the fiber reinforced composite anchor rod is preferably 20-28 mm, and the length of the fiber reinforced composite anchor rod is preferably 10-20 m; the distance between two adjacent fiber reinforced composite anchor rods is preferably 1500-2000 mm, the invention is preferably constructed according to sectional row, and the row distance is preferably 2000-3000 mm. In the invention, the fiber reinforced composite anchor rod is preferably provided with 3 anchor bars for fixing the fiber reinforced composite anchor rod during installation. In the present invention, the design inclination angle of the fiber reinforced composite anchor is preferably 15 ° to 25 °.
In the invention, the aperture of the drilled hole is preferably 100-150 mm.
In the invention, the thickness of the steel backing plate is preferably 15-25 mm, and the outer diameter is preferably 150-180 mm.
In the invention, the length of the nut is preferably 20-60 mm, the thread pitch is preferably 9-10.5 mm, the outer diameter is preferably 40-60 mm, and the inner diameter is preferably 20-28 mm.
The invention also provides a construction method for secondarily reinforcing the old side slope, which comprises the following steps: according to the structure of the technical scheme, the prefabricated lattice beams are installed on the outer side of the old protective structure, concrete baffles are filled between the prefabricated lattice beams, and the prefabricated lattice beams are anchored on the old side slope by using a fiber reinforced composite anchoring system.
In the present invention, the method of forming the fiber reinforced composite anchoring system comprises the steps of: arranging a drill hole on the old slope, wherein the depth of the drill hole is determined according to the design length of the fiber reinforced composite anchor rod, and an ultra-drilling section with a certain length is reserved; inserting one end of a fiber reinforced composite anchor rod into the drill hole, and injecting cement mortar into the drill hole to form a grouting body; the method comprises the steps of arranging anchor holes and concrete baffles on a prefabricated lattice beam, aligning the anchor holes with drilled holes, enabling the other end of a fiber reinforced composite anchor rod to penetrate through the anchor holes, sequentially arranging an anchor inclined support, a steel base plate and a nut on the outer side of the prefabricated lattice beam, and sealing the steel base plate and the nut by utilizing concrete sealing anchors to form a fiber reinforced composite material anchoring system.
In the present invention, it is preferable to inject cement mortar into the borehole using a grout pipe.
In the invention, the cement mortar has the preferred sand-lime ratio of 1.0-1.5, the preferred water-lime ratio of 0.45-0.5 and the preferred slurry strength of 25-35 MPa. In the invention, the grouting pressure of the cement mortar is preferably 0.5-0.8 MPa, and the secondary high-pressure grouting pressure is preferably 1.5-2.5 MPa.
In a specific embodiment of the present invention, the construction method for secondarily reinforcing the old side slope includes:
(1) according to the secondary reinforcement design scheme of the old side slope, the sizes, the quantities and the reinforcing bars of the L-shaped lattice beams, the T-shaped lattice beams and the cross-shaped lattice beams are determined, and the L-shaped lattice beams, the T-shaped lattice beams and the cross-shaped lattice beams are prefabricated and maintained by a factory to wait for on-site assembly construction.
(2) Carrying out artificial field flattening on the anchor rod working surface so as to meet the requirements of an anchor rod machine and a casing drilling machine; before construction, a total station and a theodolite are used for measuring control points of anchor rod construction, stone burying and marking are carried out, after a retest line is qualified, hole sites are arranged on the spot by using a steel ruler and a survey line, and marking is carried out by using red paint, wherein one hole is marked.
(3) After the drilling machine is put in place according to the position of a hole site which is measured and released by paying off in the prior art, the angle is adjusted, and the allowable verticality deviation of the hole site is 100mm in the horizontal direction and 50mm in the vertical direction; positioning the hole according to the design requirement, adopting a special bolting machine with a sleeve to mechanically work to form the hole, and adjusting the included angle between the drilling angle of the drilling machine and the horizontal plane; drilling holes are drilled in a rotary mode, and the drilling holes reach a preset depth; quantitative accelerating agents, glass water, sand bag steel pipes and other plugging materials are stored on site to prevent a large amount of water and sand gushing in holes in the process of forming the holes; and after the drilling construction of the drilling machine is finished, cleaning mud, mud skin and sediments in the hole.
(4) The method comprises the following steps of manufacturing a fiber reinforced composite anchor rod on site, wherein the anchor rod consists of an anchor rib, a centering bracket, a primary normal-pressure grouting pipe and a secondary high-pressure grouting pipe, and a pull rod of the anchor rod is arranged in the center of a drilled hole; grouting by using a grouting pipe, wherein the grouting material adopts common silicate cement paste and an accelerator is added, and the materials such as cement, a fine aggregate accelerator and the like meet the corresponding standard requirements; the grouting liquid is prepared according to the design requirement, the normal pressure grouting pressure is 0.5MPa, and secondary high pressure grouting is carried out according to the field condition.
(5) And installing the lattice beam and the concrete baffle, enabling the fiber reinforced composite anchor rod to penetrate out of the anchor hole in the lattice beam, laying an anchor inclined support, a steel base plate and a nut, and sealing the anchor by using concrete to form a fiber reinforced composite material anchoring system.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Example 1
The secondary reinforcement old side slope structure provided by the embodiment is shown in fig. 1-2, an old protective structure 4 is arranged on an old side slope 1, the old protective structure 4 is a support wall, an anchor rod reinforcement system and the like, stand columns are arranged on the outer side of the old protective structure 4 and can be directly utilized, a part of transverse prefabricated lattice beams 2 are added for secondary reinforcement, the prefabricated lattice beams 2 are anchored by a fiber reinforced composite material anchoring system 3, the middle of the prefabricated lattice beams is filled with a concrete baffle 18, a plurality of water drainage holes 5 are distributed in the concrete baffle 18 and the old protective structure 4, and coarse sand is filled in the water drainage holes 5; the water drainage holes 5 are made of PVC pipes with the inner diameter of 28mm, are arranged at intervals of 1800mm in a quincunx mode, and are inserted into the old side slope by 500 mm; the average grain diameter of the coarse sand is 8 mm.
The old side slope 1 is a rock side slope, and the side slope angle is 78 degrees.
The prefabricated lattice beam 2 consists of L-shaped, T-shaped and cross-shaped lattice beams (as shown in figure 3), is prefabricated in a factory and is constructed in an on-site assembly mode; the corners of the L-shaped lattice beam, the T-shaped lattice beam and the cross-shaped lattice beam are provided with anchor holes 19, and the diameters of the anchor holes are 120 mm;
the whole length of the prefabricated lattice beam 2 is 210m, and the width of the prefabricated lattice beam is 17.2 m; the prefabricated lattice beam is composed of a plurality of sections of lattice beams 20 (as shown in fig. 4), and each section of lattice beam 20 is 2000mm long, 500mm high and 350mm wide; the connecting ends between two adjacent sections of lattice beams 20 are spliced with the steel bar jacks 21 through steel bar plugs 22, the steel bar jacks 21 are formed by corrugated steel pipes 24, gaps between the corrugated steel pipes 24 and the steel bar plugs 22 are filled with connecting agents 26, and the joints between the lattice beams 20 are also filled with the connecting agents 26; and embedded steel bars 23 are arranged in the prefabricated lattice beam.
The concrete baffle 18 is constructed in an assembly mode, each concrete baffle is 2000mm long, 2000mm wide and 250mm high, a reinforcing mesh 6 (shown in figure 5) is arranged in the concrete baffle, and the diameter of the reinforcing mesh is 18 mm.
The prefabricated lattice beam 2 and the concrete baffle 18 are spliced by adopting a steel bar plug 22 and a steel bar jack 21 (as shown in fig. 7), the steel bar jack 21 is formed by a corrugated steel pipe 24, a gap between the corrugated steel pipe 24 and the steel bar plug 22 is filled with a connecting agent 26, and the joint between the prefabricated lattice beam 2 and the concrete baffle 18 is also filled with the connecting agent 26; and embedded steel bars 23 are arranged in the prefabricated lattice beam.
As shown in fig. 5 to 6, the fiber reinforced composite anchoring system 3 is characterized in that a hole 15 is drilled at a set position on an old side slope, the aperture of the drilled hole 15 is 120mm, the depth is determined according to the design length of a fiber reinforced composite anchor rod 11, and an ultra-drilling section 14 with a certain length is reserved; after the prefabricated lattice beam 2 is installed, aligning the anchor hole 19 with the drill hole 15, and inserting one end of the fiber reinforced composite anchor rod 11 into the drill hole 15; the fiber reinforced composite anchor rod 11 is a Glass Fiber Reinforced Polymer (GFRP) rib, the diameter is 28mm, 3 anchor bars 17 are arranged on the fiber reinforced composite anchor rod, the bracket 12 is used for centering, and then the grouting pipe 16 is used for injecting cement mortar 13 to form a cement mortar anchoring body; the other end of the fiber reinforced composite anchor rod 11 penetrates out of the anchor hole, and the design inclination angle is 20 degrees; arranging an anchor inclined support 7, a steel base plate 8 and a nut 9 on the outer side of the prefabricated lattice beam 2, and then sealing the steel base plate 8 and the nut 9 by using a concrete seal anchor 10 to form a fiber reinforced composite material anchoring system 3;
the length of the fiber reinforced composite anchor rods 11 is 16mm, the distance between the anchor rods is 1800mm, the construction is performed according to sectional rows, and the row spacing is 2500 mm;
the thickness of the steel backing plate 8 is 22mm, and the outer diameter is 160 mm;
the length of the nut 9 is 20mm, the thread pitch is 9mm, the outer diameter is 40mm, and the inner diameter is 20 mm;
the sand-lime ratio of the cement mortar 13 is 1.2, the water-lime ratio is 0.5, and the slurry strength is 30 MPa; the grouting pressure is 0.8MPa, and the secondary high-pressure grouting pressure is 2.0 MPa.
Example 2
The cutting slope of the old hundred thousand tank area of the port storage department is located in the mountain slope area on the west side of the same level in the refining department of the middle petrochemical site, the maximum slope height of the original old side slope is 41.3m, the slope is settled at four levels, a grouted rubble retaining wall, an anchor rod retaining wall and sprayed concrete support is adopted for the first level slope surface, the anchor rod, a stand column and a prefabricated baffle support are adopted for the second level slope surface and the third level slope surface, and the sprayed concrete support is adopted for the fourth level slope surface. Along with the operation of the slope for nearly 20 years, and along with the extension of time and the influence of offshore marine environment, reinforced concrete carbonization exists in the second stage, the third stage and the stand columns, so that the protective layer is generally peeled off, the phenomenon of corrosion and even breakage of the reinforced steel bars is caused, and peeled-off objects are visible to be accumulated on the platform. In addition, the second-level slope surface has water seepage at multiple positions, local vegetation develops, the grout rubble retaining wall has the phenomena of local water seepage, joint pointing falling and vegetation development, the fourth-level slope surface is damaged due to cicada co-spraying concrete, the slope protection capability is weakened, the local disease characteristics appear, and the worker is threatened if the fourth-level slope surface is further developed. Therefore, secondary reinforcement (reinforcement) is carried out according to the deformation conditions of the side slope and the governing engineering structure. Influenced by the layout of the main engineering in the early stage, the available space for secondary reinforcement is limited, and larger construction disturbance is not suitable to be generated. Therefore, the anchoring technology which is reasonable in stress, good in anchoring performance, small in construction damage and strong in adaptability to terrain conditions is the best choice for secondary reinforcement of the slope body and the original treatment engineering structure.
1. Design scheme
Comprehensively considering the geological conditions of the project and the factors of all aspects of the peripheral environmental conditions, analyzing and comparing, carrying out secondary reinforcement by adopting the anchor rods, the supporting walls, the upright columns (original) and the prefabricated lattice beams, and adopting the following specific design scheme:
(1) reinforcing and protecting an original old supporting structure baffle area by adopting a fiber reinforced composite anchor rod retaining wall, wherein the anchor rod adopts a full-length bonded cement mortar GFRP fiber reinforced composite anchor rod, and the anchor bars adopt GFRP fiber bars with the diameter of 28 mm; the length of the anchor rods is 9M and 12M, the distance is 1.5M multiplied by 3.0M (vertical), the lowest row is higher than the platform by 1.5M, the inclination angle of the anchor rods is 15 degrees, the aperture is 100mm, M30 cement mortar is adopted for grouting, and P.042.5 ordinary portland cement is adopted for cement.
(2) The height of the prefabricated lattice beam is 600mm, the width of the prefabricated lattice beam is 350mm, and the length of the prefabricated lattice beam is required to be according to the prefabricated baffle of the original side slopeAnd (4) determining the size. The support wall is prefabricated by adopting reinforced concrete, the strength grade of the concrete is C35, the thickness of the concrete is 20cm, the thickness of the reinforcing steel bar protective layer is not less than 50mm, the height and the width of the wall body are determined according to the size of a prefabricated baffle of the original side slope, and the height of the wall body is not more than 3m in principle. The water outlet is reserved in the wall and is internally provided with
The outward inclination angle of the PVC drain pipe is not less than 5 percent.
2. Construction technical scheme
(1) Before drilling the anchor rod hole, hole positions are determined according to requirements and the condition of the slope surface of the side slope, and marks are made.
(2) Before the stock installation, the body of rod should be straight, and cement mortar ratio is: the ash-sand ratio is 1.0-1.5, the water-cement ratio is 0.45-0.50, and the slurry strength is not lower than 30 MPa.
(3) The cement is P.042.5 ordinary portland cement, and the thickness of the anchor rod mortar protective layer is not less than 25 mm.
(4) During grouting, the grouting pipe is inserted 50-100 mm away from the bottom of the hole and is pulled out slowly and uniformly along with the injection of cement mortar, and after the rod body is inserted, if no cement mortar overflows from the hole opening, the grouting pipe is timely refilled.
(5) The length of the rod body inserted into the hole is not less than 98% of the specified length.
(6) And a pair of centering brackets is arranged every 2.0m along the anchor rod.
(7) Gaps between the supporting walls and the slope surface are firstly built and repaired by adopting stone slab concrete, and the prefabricated supporting walls are installed after the gaps are smooth.
(8) After each supporting wall is prefabricated and assembled, the two connecting plates are poured and reinforced by cement mortar.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A secondary reinforcement old side slope structure is characterized by comprising an old side slope, an old protective structure and a prefabricated lattice beam arranged on the outer side of the old protective structure; the prefabricated lattice beam is anchored on the old side slope through a fiber reinforced composite anchoring system; concrete baffles are filled between the prefabricated lattice beams.
2. The secondary reinforcement old side slope structure according to claim 1, further comprising a plurality of drainage holes, wherein the drainage holes penetrate through the old protective structure and the concrete baffle; coarse sand is filled in the water drainage holes.
3. The secondary reinforcing old slope structure according to claim 1, wherein the old protection structure is a soil nail reinforcing system, a lattice beam reinforcing system, a support wall reinforcing system or an anchor rod reinforcing system.
4. The secondary reinforced old side slope structure as claimed in claim 1, wherein the prefabricated lattice beam is one or more of an "L" shape, a "T" shape and a "cross" shape; the prefabricated lattice beam is composed of a plurality of sections of lattice beams, and the connecting end between two adjacent sections of lattice beams is spliced with the steel bar jack through a steel bar plug.
5. The secondary reinforcing old slope structure as claimed in claim 1, wherein a steel mesh is arranged inside the concrete baffle.
6. The secondary reinforcing old slope structure as claimed in claim 1, wherein the connecting ends between the prefabricated lattice beams and the concrete baffle are inserted into the steel bar insertion holes through steel bar plugs.
7. The secondary reinforcement old slope structure according to claim 1, wherein the fiber reinforced composite material anchoring system comprises a fiber reinforced composite anchor rod, an anchor hole, a drilling hole, a nut, a steel base plate, an anchor inclined support, a concrete seal anchor, a centering bracket and a grouting body; the anchor holes are arranged at the corners of the prefabricated lattice beams; the drilling hole is arranged on the old side slope and is aligned with the anchor hole; one end of the fiber reinforced composite anchor rod is inserted into the drilled hole, and the other end of the fiber reinforced composite anchor rod penetrates out of the anchor hole; the anchor inclined support, the steel base plate and the nut are sequentially arranged on the outer side of the prefabricated lattice beam and used for fixing the fiber reinforced composite anchor rod; the concrete seal anchor seals the steel base plate and the nut; the centering bracket is arranged between the fiber reinforced composite anchor rod and the drill hole; the interior of the bore hole is filled with a grout.
8. The secondary reinforced old side slope structure according to claim 1, wherein the old side slope is a soil side slope or a rock side slope; and the slope angle of the old slope is 0-90 degrees.
9. A construction method for secondarily reinforcing an old side slope comprises the following steps:
a structure according to any one of claims 1 to 8, wherein prefabricated lattice girders are installed on the outer side of the old protective structure, concrete barriers are filled between the prefabricated lattice girders, and the prefabricated lattice girders are anchored on the old side slope by using a fiber reinforced composite anchoring system.
10. Construction method according to claim 9, wherein the formation method of the fibre-reinforced composite anchoring system comprises the following steps:
arranging a drill hole on the old slope, wherein the depth of the drill hole is determined according to the design length of the fiber reinforced composite anchor rod, and an ultra-drilling section with a certain length is reserved;
inserting one end of a fiber reinforced composite anchor rod into the drill hole, and injecting cement mortar into the drill hole to form a grouting body;
the method comprises the steps of arranging anchor holes and concrete baffles on a prefabricated lattice beam, aligning the anchor holes with drilled holes, enabling the other end of a fiber reinforced composite anchor rod to penetrate through the anchor holes, sequentially arranging an anchor inclined support, a steel base plate and a nut on the outer side of the prefabricated lattice beam, and sealing the steel base plate and the nut by utilizing concrete sealing anchors to form a fiber reinforced composite material anchoring system.
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| CN206667270U (en) * | 2017-03-21 | 2017-11-24 | 浙江省工程勘察院 | Slope protection net mounting structure |
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Application publication date: 20201229 |