CN103276724B - Anti-floating pile with built-in non-metallic reinforcement - Google Patents

Abstract

The invention belongs to the technical field of anti-lift piles for building construction, and relates to a miniature anti-floating pile, in particular to an anti-floating pile with built-in non-metallic reinforcement; the main structure of the invention includes an inner anchor section, an outer anchor section, a miniature Pile body, tendon body divider, steel casing, rigid stress diffusion disc, tendon body and concrete floor; among them, the micro-pile body has a fully threaded solid structure rib body built in, and the material of the rib body is glass fiber reinforced polymer, glass fiber Compared with the existing metal reinforcement, the reinforced polymer can effectively prevent the anti-floating pile from being corroded and prolong the service life of the anti-floating pile. At the same time, the outer anchorage section is equipped with a steel sleeve and a stress diffusion disc to improve the anchoring force of the anti-floating pile; The invention has simple process, convenient installation and construction, low cost, high reliability, good economic benefit, outstanding substantive features and remarkable progress.

Description

An anti-floating pile with built-in non-metallic reinforcement

Technical field:

The invention belongs to the technical field of anti-lift piles for building construction, and relates to a miniature anti-floating pile, in particular to an anti-floating pile with built-in non-metallic reinforcement.

Background technique:

With the development and utilization of urban underground space, the buried depth of buildings (structures) continues to increase, and the problem of anti-floating has become more and more prominent. Anti-floating piles and other anti-floating technical measures; Among them, anti-floating piles are widely used, but in reality, there are many problems in anti-floating piles, such as anti-corrosion protection of anti-floating piles. Epoxy coated steel bars, increased protective layer thickness, steel bar surface anti-corrosion treatment, and cathodic protection, etc.; however, the anti-corrosion treatment and cathodic protection of the bar surface adopt isolation and insulation protection measures, and the materials used may affect the strength and adhesion of steel bars. The junction force is greatly affected, or the cost is high, and the anti-corrosion technology has not yet achieved a fundamental breakthrough. In urban transportation construction such as subways, the stray current generated by the DC power supply system cannot prevent the electrochemical corrosion of metal materials. Fundamentally solved; Compared with ordinary anti-floating piles, miniature anti-floating piles have the advantages of strong stratum adaptability, flexible layout, fast hole formation, small construction site occupation, miniaturized construction machinery, economical and environmental protection, etc., especially in hard rock The bearing capacity in the soil layer is large, and it has more advantages, so it has gradually become the preferred anti-floating measure; its working principle is to bury micro anti-floating piles in the ground, and use the tensile force of micro anti-floating piles and the mortar integrated with micro anti-floating piles (fine stone concrete) anchors to reinforce the stratum, so that the stratum forms an integral structure, so that the friction of the micro anti-floating piles is greater than the buoyancy of the water pressure, and plays the role of anti-floating, so as to achieve the purpose of controlling its deformation; but at present Most of the pile reinforcements of the micro anti-floating piles used are made of metal materials. After they are buried in the rock mass soil layer, as time goes on, the groundwater often contains Na ⁺ , Ga ²⁺ , Mg ²⁺ , Clˉ, SO ₄ ^2- Plasma makes the pile material susceptible to chemical corrosion, affects the strength of the micro anti-floating pile, and then destroys its anchoring effect. This phenomenon is particularly prominent in the anti-floating aspect of the foundation of buildings (structures) in coastal areas. In the construction of urban rail transit, the stray current generated by the DC power supply system, the electrochemical corrosion of metal materials also exists in the micro anti-floating piles, and the anti-corrosion problem of the micro anti-floating piles in the formation is also an urgent problem to be solved. question.

Invention content:

The purpose of the present invention is to overcome the defects in the prior art, seek to design a measure that can effectively solve the problem of corrosion of micro-floating anti-floating piles, and provide a kind of anti-corrosion performance that is good in corrosion resistance and pull-out bearing capacity without increasing the cost. Anti-floating piles with built-in non-metallic reinforcements with high strength and long service life.

In order to achieve the above object, the main structure of the present invention includes an inner anchorage section, an outer anchorage section, a micropile body, a tendon body separator, a steel casing, a rigid stress diffusion disc, a tendon body and a concrete floor; The ribs or ribs of the threaded solid structure are made of glass fiber reinforced polymer (GFRP). The separator of the ribs is in the shape of a circular ring with four corners, and the circular holes connected with the ribs are evenly distributed on the ring. The inner diameter of the steel casing is larger than the diameter of the tendons, the rigid stress diffusion disk is square, and the circular holes connected with the steel casing are evenly distributed on the rigid stress diffusion disk; the whole anti-floating pile is composed of two parts: the inner anchorage section and the outer anchorage section. The outer side of the inner anchorage section of the miniature anti-floating pile (that is, the micropile body) is connected with the micropile body, which plays a central role in the installation of the miniature anti-floating pile; there are several non-metallic tendons built in the micropile body, and the rib body separator It is installed on the ribs at equal intervals and connected with the inner wall of the micro-pile body and the ribs to fix the centering of the ribs; the steel sleeve is set on the ribs of the outer anchorage section, and the steel sleeve and the micro-pile body A certain distance is left at the top of the steel casing, and epoxy resin is filled between the inner side of the steel casing and the ribs to make them tightly connected; the rigid stress diffusion plate is inserted into the steel casing through the through hole, and the rigid stress is diffused by welding. The disc is connected with a steel sleeve.

When the present invention is installed, holes are drilled on the rock and soil foundation according to the size and position of the miniature piles to form miniature anti-floating pile holes, and the pile holes are perpendicular to the ground; In the pile hole, manually feed until the bottom of the micro-pile body reaches the bottom of the pile hole, and keep the micro-pile body vertical during installation; the outer end of the micro-pile hole is connected to the grouting pipe, and the grouting pipe is extended to the bottom of the pile hole Use the grouting pump to inject the grout along the grouting pipe. When the grouting liquid reaches the top of the grouting hole, pull out the grouting pipe and turn off the grouting pump. So far the whole grouting process is completed. After the grouting is completed, the grouting The top of the grout hole is smoothed manually; a steel casing is installed on the reinforcement of the outer anchorage section of the micro-pile body, and the steel casing is tightly bonded to the reinforcement through epoxy resin. The length of the steel casing is determined according to the design anchoring force; The rigid stress diffusion plate is installed on the outside of the steel casing by welding. The installation position of the rigid stress diffusion plate is controlled by the thickness of the concrete foundation floor. The thickness and anti-floating requirements determine the length of the outer anchorage section of the micro-pile body, so far the installation process of the entire micro-floating anti-floating pile is completed.

Compared with the prior art, the present invention adopts glass fiber reinforced polymer (GFRP) for the ribs and ribs of the miniature anti-floating piles, which can effectively prevent the anti-floating piles from being corroded, prolong the service life of the anti-floating piles, and at the same time be externally anchored Steel sleeves and stress diffusion discs are installed in the section to improve the anchoring force of anti-floating piles. Its process is simple, installation and construction are convenient, low cost, high reliability, good economic benefits, and has outstanding substantive features and significant progress.

Description of drawings:

Fig. 1 is a schematic diagram of the principle of the main structure of the present invention.

Fig. 2 is a schematic diagram of the structural principle of the connection between the outer anchoring section and other parts involved in the present invention.

Fig. 3 is a schematic diagram of the sectional structure along line A-A in Fig. 1 .

Fig. 4 is a schematic diagram of the cross-sectional structure along the line B-B in Fig. 2 .

detailed description:

The present invention will be further elaborated below through specific embodiments and in conjunction with the accompanying drawings.

The main structure of this embodiment includes an inner anchorage section 1, an outer anchorage section 2, a micropile body 3, a tendon body separator 4, a steel casing 5, a rigid stress diffusion disc 6, a tendon body 7, and a concrete floor 8; wherein the micropile The body 3 has a built-in rib or rib body 7 with a solid thread structure, and the material of the rib body 7 is glass fiber reinforced polymer (GFRP). Distributing circular holes communicating with the ribs 7, the inner diameter of the steel casing 5 is larger than the diameter of the ribs 7, the rigid stress diffusion disc 6 is square, and the rigid stress diffusing disc 6 is evenly distributed with circular holes communicating with the steel sleeves 5; the entire The anti-floating pile is composed of two parts, the inner anchor section 1 and the outer anchor section 2. The outer side of the inner anchor section 1 (that is, the micro pile body) of the miniature anti-floating pile is connected with the miniature pile body 3, which serves as a support for the installation of the miniature anti-floating pile. Medium effect; the micro-pile body 3 has a number of non-metallic ribs 7 built in, and the rib body dividers 4 are set on the rib body 7 at equal intervals and connected with the inner wall of the micro-pile body 3 and the ribs, so as to fix the rib body 7. The role of centering; the steel casing 5 is set on the rib body 7 of the outer anchorage section 2, and a certain distance is left between the steel casing 5 and the top of the micro pile body 3, and the inner side of the steel casing 5 and the rib body 7 are filled The epoxy resin makes them tightly connected together; the rigid stress diffusion disk 6 is inserted into the steel casing 5 through the through hole, and the rigid stress diffusion disk 6 is connected with the steel casing 5 by welding.

When the present embodiment realizes installation, drill holes on the rock foundation according to the size and position of the miniature pile body 3 to form miniature anti-floating pile holes, and the pile holes are perpendicular to the ground; The pile body 3 is inserted into the pile hole and manually fed until the bottom of the micro-pile body 3 reaches the bottom of the pile hole. During the installation process, the micro-pile body 3 is kept vertical; The pipe extends to the bottom of the pile hole, and the grouting pump is used to inject the grout along the grouting pipe. When the grouting liquid reaches the top of the grouting hole, the grouting pipe is pulled out and the grouting pump is turned off, thus completing the entire grouting process. After the grouting is completed, the top of the grouting hole is artificially smoothed; the steel sleeve 5 is installed on the rib body 7 of the outer anchorage section 2 of the micro-pile body 3, and the steel sleeve 5 is tightly bonded to the rib body 7 by epoxy resin. The length of the steel sleeve 5 is determined according to the design anchoring force; the rigid stress diffusion disc 6 is installed by welding on the outside of the steel sleeve 5, and the installation position of the rigid stress diffusion disc 6 is controlled by the thickness of the concrete foundation floor. 6. The size of the bottom area and the number of cavities are determined according to the design anchoring force; the length of the outer anchorage section 2 of the micro-pile body 3 is determined according to the thickness of the concrete floor 8 and the anti-floating requirements, and the installation process of the entire micro-floating anti-floating pile is completed so far.

Claims (1)

1. an anti-floating pile for built-in nonmetal muscle material, is characterized in that agent structure comprises grouted part (1), outer anchoring section (2), miniature pile body (3), muscle body separator (4), steel sleeve (5), rigidity stress spread dish (6) and muscle body (7), miniature pile body (3) is built-in with the muscle body (7) of full thread solid construction, the material of muscle body (7) is glass fiber reinforced polymer, it is upper and be connected with the inwall of miniature pile body (3) and muscle body (7) that muscle body separator (4) is sleeved on muscle body (7) equally spacedly, steel sleeve (5) is sleeved on the muscle body (7) of outer anchoring section (2), steel sleeve (5) keeps spacing with the top of miniature pile body (3), steel sleeve (5) inner side makes together with its compact siro spinning technology with packing ring epoxy resins between muscle body (7), rigidity stress spread dish (6) is sleeved on steel sleeve (5), rigidity stress spread dish (6) is made to be connected with steel sleeve (5) in a welding manner, muscle body separator (4) is four horn shapes in annulus, annulus are uniformly distributed the circular hole communicated with muscle body (7), rigidity stress spread dish (6), in square, card is evenly distributed with the circular hole communicated with steel sleeve (5).