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CN-117328450-B - Construction method of pressure-bearing type combined capsule cabin anchor rod

CN117328450BCN 117328450 BCN117328450 BCN 117328450BCN-117328450-B

Abstract

The invention relates to the field of buildings, in particular to a construction method of a pressure-bearing combined capsule cabin anchor rod, which comprises the following steps of S1, positioning a punching point of a soil layer; S2, drilling holes in soil layer construction, S3, placing the anchor rods into the holes, S4, grouting the capsule of the anchor rods into the capsule of the anchor rods to expand the capsule, grouting the capsule into the holes, S5, applying prestress to tensioning the anchor rods after grouting is completed, S6, and completing construction. The invention can calculate the optimal prestress locking value applied to the anchor rod under different working conditions when the anchor rod is constructed, thereby maximizing the strength and the durability of the anchor rod.

Inventors

  • WU TAO
  • WEI ZHIYONG

Assignees

  • 安徽筑垚智能科技有限公司

Dates

Publication Date
20260505
Application Date
20231116

Claims (7)

  1. 1. The construction method of the pressure-bearing combined capsule cabin anchor rod is characterized by comprising the following steps of: S1, positioning punching points on a soil layer; S2, drilling holes in soil layer construction; s3, placing the anchor rod (1) into the drill hole; S4, grouting into the capsule cabin of the anchor rod (1) to expand the capsule cabin, and grouting into the drilled hole; S5, after grouting is completed, applying prestress to stretching of the anchor rod (1); S6, finishing construction; The bottom of the anchor rod (1) is coaxially fixed with a sleeve (2), the upper end and the lower end of the sleeve (2) are both closed, the inner wall of the sleeve (2) is enclosed with the anchor rod (1) to form an annular separation cavity for grouting flow, a grouting joint (21) communicated with the annular separation cavity is arranged on the sleeve (2), a grouting pipe (24) is detachably matched with the grouting joint (21) along the direction parallel to the anchor rod (1), a grouting opening is further formed in the sleeve (2) for grouting to sequentially pass through the grouting pipe (24), the grouting joint (21), the annular separation cavity and a capsule cavity of a capsule cabin (23) after the grouting opening; The length of the capsule cabin (23) corresponds to the length of the sleeve (2), an anchoring top plate (11) and an anchoring bottom plate (14) for positioning the anchor rod (1) are respectively arranged at the top end and the bottom end of the anchor rod (1), a locking nut (13) in threaded fit with the anchor rod (1) is arranged on the anchor rod (1), and the sleeve (2) is clamped and locked by the locking nut (13) and the anchoring bottom plate (14) in a matched mode.
  2. 2. The construction method of the pressure-bearing combined capsule anchor rod according to claim 1, wherein the grouting joint (21) is in an elbow shape, and the grouting pipe (24) is in threaded fit with a plumb section of the grouting joint (21).
  3. 3. The construction method of the pressure-bearing combined capsule anchor rod according to claim 1, wherein the position of the grout outlet corresponds to the position of the bottom end of the capsule (23) so that grouting fills the capsule cavity of the capsule (23) from bottom to top, and a one-way grouting valve (22) is arranged on the grout outlet.
  4. 4. A method of constructing a pressure-bearing composite capsule anchor according to claim 3, wherein at least two groups of grout discharge openings are arranged, and the distance between adjacent grout discharge openings increases gradually from bottom to top.
  5. 5. The construction method of the pressure-bearing combined capsule cabin anchor rod according to claim 1, wherein the anchoring top plate (11) and the anchoring bottom plate (14) are steel bar anchoring plates, and the contact surface of the locking nut (13) and the sleeve (2) is sealed through a rubber gasket.
  6. 6. The construction method of the pressure-bearing combined capsule cabin anchor rod according to claim 1, wherein the top end of the anchor rod (1) extends to the upper portion of the concrete cushion layer (3), and a water-stopping rubber ring (12) is arranged on the contact surface of the anchor rod (1) and the concrete cushion layer (3).
  7. 7. The construction method of the pressure-bearing combined capsule cabin anchor rod is characterized in that an anchor rod (1) is arranged on a rod body between a sleeve (2) and a concrete cushion layer (3) at intervals, the centering supporting bodies (15) are arranged in a conical surface shape with wide upper parts and narrow lower parts, the centering supporting bodies (15) are in threaded fit with the anchor rod (1), the anchor rod (1) is a threaded reinforcing steel bar, PE pipes are fixed on the rod body between the sleeve (2) and the concrete cushion layer (3) in a heat-shrinkable mode, anti-corrosion grease is filled in gaps between the PE pipes and the anchor rod (1), and spiral stirrups below the concrete cushion layer (3) are coaxially arranged on an outer ring of the anchor rod (1).

Description

Construction method of pressure-bearing type combined capsule cabin anchor rod Technical Field The invention relates to the field of buildings, in particular to a construction method of a pressure-bearing combined capsule cabin anchor rod. Background The anchor rod is used for anchor rod support, which is a reinforcing support mode adopted in the surface engineering of slopes, rock and soil deep foundation pits and the like and the underground chamber construction of tunnels, stopes and the like, a rod column is made of metal pieces, wood pieces, polymer pieces or other materials, the anchor rod is driven into a hole drilled in advance on a surface rock body or surrounding rock bodies of the chamber, and the special structures of the head part and the rod body and the tail support plate (or not used) are utilized, or the surrounding rock and the stable rock body are combined together by means of bonding to generate a suspension effect, a combined beam effect and a reinforcing effect, so that the support purpose is achieved, the anchor rod has good support effect, and the advantages of saving materials, simplicity in construction, convenience for mechanized operation and high construction speed; one end of the anchor rod is connected with the engineering structure, the other end of the anchor rod penetrates into the stratum, the whole anchor rod is divided into a free section and an anchoring section, and the free section is used for transmitting the tensile force at the head of the anchor rod to the area of the anchoring body and has the function of applying prestress to the anchor rod. The anchor rod is usually required to be prestressed to improve the strength and durability of the anchor rod during construction, but for different construction working conditions, how to adjust the prestress locking value of the anchor rod to maximize the strength and durability of the anchor rod is not studied, in addition, the existing anchor rod comprises an outer sleeve and an inner anchor rod, the outer sleeve is sleeved on the outer sleeve and is in threaded connection with the outer side of the inner anchor rod, the inner anchor rod comprises a rod body and a drill bit, and grouting holes penetrating through the rod body and the drill bit are formed in the inner anchor rod along the length direction of the inner anchor rod. The problem faced in the prior art is that the grouting speed is affected by the diameter of the holes due to the fact that the grouting speed is affected by the diameter of the holes, and the grouting holes are easily blocked by solid matters in grouting, so that production interruption is caused, so that the problem needs to be solved. Disclosure of Invention In order to avoid and overcome the technical problems in the prior art, the invention provides a construction method of a pressure-bearing combined capsule cabin anchor rod. The invention can calculate the optimal prestress locking value applied to the anchor rod under different working conditions when the anchor rod is constructed, thereby maximizing the strength and the durability of the anchor rod. In order to achieve the above purpose, the present invention provides the following technical solutions: a construction method of a pressure-bearing combined capsule cabin anchor rod comprises the following steps: S1, positioning punching points on a soil layer; S2, drilling holes in soil layer construction; S3, placing the anchor rod into the drill hole; s4, grouting into the capsule cabin of the anchor rod, expanding the capsule cabin, and grouting into the drilled hole; S5, after grouting is completed, prestressing force is applied to the stretching of the anchor rod, and the prestressing locking value sigma Lock with locking mechanism of the anchor rod is as follows: σ Lock with locking mechanism ＝σ Damage to +σcon wherein sigma Damage to represents the sum of all prestress loss values of the anchor rod; wherein a represents the inward shrinkage value of the stretching end of the anchor rod; e s represents the elastic modulus of the anchor rod; l represents the distance from the stretching end of the anchor rod to the anchoring end; e represents the Euler number; kappa represents the friction coefficient of the local deviation of the drilled hole channel; x represents the drilling length of the soil layer; μ represents the friction coefficient of the anchor rod and the borehole channel; Theta represents the stretching end of the anchor rod and the drilling hole the sum of included angles of tangent lines of the pore canal; σ pc represents the concrete normal compressive stress at the joint force point of the tension zone of the anchor rod; f represents the compressive strength of the grouting concrete when the prestress is applied; ρ represents the reinforcement ratio of the tensile zone of the anchor rod; σ con represents the anti-floating tension of the anchor rod; σcon＝0.793fpyk f pyk represents the yield strength of the bolt; S6,