CN212477843U

CN212477843U - Anti-floating structure for implanting prefabricated anchor rod by utilizing substrate reinforcement body

Info

Publication number: CN212477843U
Application number: CN202020646233.XU
Authority: CN
Inventors: 邱太岗; 刘国胜
Original assignee: MCC Tiangong Group Corp Ltd
Current assignee: MCC Tiangong Group Corp Ltd
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2021-02-05
Anticipated expiration: 2030-04-26

Abstract

The utility model provides an anti-floating structure for implanting a prefabricated anchor rod by utilizing a base reinforcement body, which comprises a reinforcement body and a prefabricated anchor rod, wherein the reinforcement body is a cement stirring pile or a jet grouting pile; the prefabricated anchor rod comprises an anchor rod body and anchoring steel bars arranged in the anchor rod body; the upper end part of the anchoring steel bar extends out of the anchor rod body and is used for being connected with a foundation slab; the anchor rod body outside be provided with the stiffening member be used for strengthening with add solid joint strength, utilize prefabricated anchor rod with the foundation slab with add solid joint together, make full use of the high improvement of basement intensity consolidates the soil body, effectively utilize the basement to add the anti-floating ability of underground structure, especially be fit for being used for to high water level, basement cover have deep weak stratum underground structure's anti-floating construction.

Description

Anti-floating structure for implanting prefabricated anchor rod by utilizing substrate reinforcement body

Technical Field

The utility model belongs to the technical field of the construction, especially, relate to an utilize anti structure of floating of prefabricated stock of basement reinforcement body implantation.

Background

Under the national introduction of developing urbanization and urban underground space policies, the underground space of large and medium cities in China, particularly east coastal cities, is developed dramatically. Some engineering sites have high underground water level and deep and soft soil layers at the bottom of the pit, the problems of excavation deformation of a deep foundation pit and floating damage of an underground structure occur continuously, and even irreversible and repairing damage can be caused. At present, the foundation pit deformation is generally controlled by reinforcing a pit bottom soil body in engineering, and an uplift pile control structure is adopted for floating. The traditional construction method does not utilize the pit bottom reinforced soil to participate in anti-floating control of the control structure, so that resource waste, engineering cost increase and poor effect are caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the embodiment of the utility model provides a, have

In order to solve the above technical problems, an embodiment of the present invention provides an anti-floating structure using a base reinforcement body to implant a prefabricated anchor rod, comprising a reinforcement body and a prefabricated anchor rod, wherein the reinforcement body is a soil body structure for enhancing bearing capacity and strength of a foundation,

the prefabricated anchor rod comprises an anchor rod body and anchoring steel bars arranged in the anchor rod body, and the anchor rod body is positioned in the reinforcing body; the upper end part of the anchoring steel bar extends out of the anchor rod body and is used for being connected with a foundation slab; the anchor rod body outside is provided with stiffening member be used for strengthening with add solid joint strength.

Preferably, the reinforcing body is a cement mixing pile or a jet grouting pile.

Preferably, the stiffening element is a thread groove arranged on the outer side of the anchor rod body or at least one stressed disc arranged on the outer side of the anchor rod body, and the sectional dimension of the stressed disc is larger than that of the anchor rod body.

Preferably, the upper end of the prefabricated anchor rod is provided with a guide body for wrapping and positioning the upper end of the anchoring steel bar to extend out of the anchor rod body, the prefabricated anchor rod body is made of concrete with the strength not lower than C30, and the guide body is made of concrete or cement mortar with the strength lower than C30.

Preferably, a water stop ring is arranged on the part of the upper end of the anchoring steel bar, which extends out of the anchor rod body part.

The utility model has the advantages that:

aiming at the construction of a foundation with high water level and a deep and soft stratum covered on the foundation, a prefabricated anchor rod is implanted into a foundation reinforcement body of a deep foundation pit, so that the foundation strength is fully utilized, the reinforced soil body is improved, and the anti-floating capacity of an underground structure is improved;

secondly, the stress disc or the stress block is arranged on the rod body of the prefabricated anchor rod, so that the contact area and the frictional resistance between the anchor rod and the reinforcing body are increased, and the anti-floating capacity of the anchor rod is further improved.

Drawings

Fig. 1 is a schematic structural view illustrating an anti-floating structure for implanting a prefabricated anchor rod using a base reinforcement body according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an anti-floating structure according to an embodiment of the present invention, in which a prefabricated anchor rod is implanted with a base reinforcement body at another construction stage;

in the figure:

1. implanting equipment 2, anchor clamps 3, pile follower

4. Guide body 5, prefabricated anchor rod 6 and reinforcing body

7. Earthwork 8 above pit bottom, anchoring reinforcing steel bar 9 and water stop ring

10. Foundation slab 11, waterproof layer 12, bed course

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 and 2, an anti-floating structure for implanting a prefabricated anchor rod using a base reinforcement body according to an embodiment of the present invention includes a reinforcement body and a prefabricated anchor rod, wherein,

the reinforcing body 6 is a cement stirring pile or a rotary jet grouting pile; high-compression weak soil bodies exist at the bottom of a deep foundation pit with higher underground water level near a river or near the sea, which is very unfavorable for the horizontal displacement of the deep layer of the enclosure structure of the foundation pit and the vertical displacement of the bottom, and the cement soil constructed by the processes of high-pressure jet grouting piles, triaxial mixing piles and the like is usually adopted to reinforce the weak soil bodies at the bottom of the pit, wherein the reinforcing depth is generally not less than 4m, and the pile position of the prefabricated anchor rod 5 can be independently deepened;

the prefabricated anchor rod 5 comprises an anchor rod body and an anchoring steel bar 8 arranged in the anchor rod body; the upper end part of the anchoring steel bar 8 extends out of the anchor rod body and is connected with a foundation slab 10; the anchor rod body outside is provided with the stiffening member and is used for strengthening the joint strength with reinforcing body 6. The processing and manufacturing of the prefabricated anchor rod 5 are completed in a prefabricated field, preferably, the anchoring steel bars 8 are bound by steel bars with the diameter not smaller than phi 16, after the formwork erection is completed, concrete with the strength not lower than C30 is poured, and maintenance is performed after the pouring is completed. The prefabricated anchor rods 5 can be delivered after the strength reaches 75% of the design strength. Generally speaking, the diameter of the prefabricated anchor rod 5 is in the range of phi 200-phi 400, and the prefabricated anchor rod 5 with a proper size is selected according to the actual needs of the field.

In a preferred embodiment, the stiffener is a thread groove provided on the outer side of the anchor body. Specifically, the template inner wall of prefabricated stock 5 is provided with screw thread arch or thread groove, and the surface of prefabricated stock 5 can have corresponding screw thread, increase and add solid 6's area of contact, reinforcing prefabricated stock 5's withdrawal resistance.

Preferably, the stiffening element is at least one stressed disc arranged on the outer side of the anchor rod body, and the cross section of the stressed disc is larger than that of the anchor rod body. Specifically, the atress dish is for setting up the arch in the stock body outside, its shape can be annular or a plurality of protruding piece ring cloth in the stock body outside, its effect is the increase and adds the area of contact of solid 6, strengthens prefabricated stock 5's withdrawal resistance.

Preferably, a water stop ring 9 is provided on the upper end of the anchoring bar 8 extending out of the body portion of the anchor rod. Specifically, the water stop ring is a water-swelling water stop rubber ring.

The utility model discloses an utilize anti construction method who floats structure of prefabricated stock of basement reinforcement body implantation, including the step:

reinforcing the soft soil body of the substrate by adopting a jet grouting pile or a cement mixing pile;

implanting a prefabricated anchor rod 5 into the rotary jet grouting pile or the cement mixing pile; specifically, the prefabricated anchor rod 5 is watered earlier moist or the interfacial agent is applied paint with a brush on the surface before the implantation, make anchor rod and the better combination of reinforcement body 6 increase frictional resistance, carry out the anchor rod implantation immediately when satisfying anchor rod implantation working face requirement (before the initial set of cement soil of jet grouting pile or cement mixing pile), earlier insert prefabricated anchor rod 5 in the stake downthehole, to the guide body 4 temporary fixation at 5 tops of prefabricated anchor rod, embolia guide body 4 with pipe pile follower 3, remove temporary fixing device, pile follower 3 sinks prefabricated anchor rod 5 design depth. Preferably, when the resistance is large, the implantation device 1 is additionally arranged above the pile feeder 3 to assist vibration and enable the pile feeder to sink. Wherein the implantation apparatus 1 is a vibration apparatus for assisting the pile feeder 3 in pile sinking operation, the implantation apparatus 1 and the pile feeder 3 are both of the prior art, and a detailed structural description thereof is not provided herein.

Excavating earth to a designed elevation after the foundation pit descends; specifically, after the foundation pit has the excavation conditions, excavation of the earthwork 7 above the pit bottom is performed according to the requirement of the foundation pit excavation scheme.

And (5) constructing the foundation slab, wherein the upper end of the anchoring steel bar 8 extends out of the anchor rod body part and extends into the foundation slab 10. Specifically, the mortar or concrete of the guide body 4 is chiseled, the design top elevation of the prefabricated anchor rod 5 is measured, the circumferential mark is made, the cutting is performed circularly, the mortar or concrete is removed, the position and the angle of the anchoring steel bar 8 are adjusted according to the design requirements, and the prefabricated anchor rod 5 is subjected to relevant test detection and acceptance. And then, constructing a foundation slab 10, sleeving a water stop ring 9 on the anchoring reinforcing steel bar 8 before binding the reinforcing steel bar of the foundation slab 10, and then performing reinforcing steel bar binding, template installation and concrete pouring operation on the foundation slab 10.

Preferably, the prefabricated anchor rod 5 is made of reinforced concrete, the strength of the reinforced concrete is not lower than C30, the prefabricated guide body 4 at the upper end of the prefabricated anchor rod 5 is used for wrapping and positioning the upper end of the anchoring steel bar 8 to extend out of the anchor rod body, and the guide body 4 is prefabricated by concrete or cement mortar with the strength lower than C30.

Preferably, the prefabricated anchor rod 5 is prefabricated with stiffening members outside the body for enhancing the connection strength with the reinforcing body 6.

Preferably, before the foundation slab 10 is constructed, the construction of the cushion layer 12 and the waterproof layer 11 is further included, and waterproof and anticorrosion construction is performed on the part, extending out of the anchor rod body, of the upper end of the anchoring steel bar 8 in the construction process.

Through the technical scheme, the foundation slab 10 and the reinforcing body 6 are connected together by utilizing the prefabricated anchor rod 5, the soil body 6 is improved and reinforced by fully utilizing the high base strength, the anti-floating capacity of the underground structure is improved by effectively utilizing the base reinforcing body 6, and the anti-floating construction method is particularly suitable for anti-floating construction of the underground structure with high water level and deep and weak stratum covered on the base.

The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. An anti-floating structure using a base reinforcement body to implant a prefabricated anchor rod is characterized by comprising a reinforcement body and the prefabricated anchor rod, wherein the reinforcement body is a soil body structure for enhancing the bearing capacity and the strength of a foundation,

2. The anti-floating structure of claim 1, wherein the reinforcement is a cement mixing pile or a jet grouting pile.

3. The anti-floating structure of claim 1, wherein the reinforcing member is a thread groove formed at the outer side of the anchor body or at least one force receiving plate formed at the outer side of the anchor body, and the cross-sectional size of the force receiving plate is larger than that of the anchor body.

4. The anti-floating structure of a precast anchor rod planted with a base reinforcing member according to any one of claims 1 to 3, wherein the precast anchor rod is provided at an upper end thereof with a guide body for wrapping and positioning an upper end of the anchoring bar protruding from the anchor rod body portion, the precast anchor rod body is concrete having a strength of not less than C30, and the guide body is concrete or cement mortar having a strength of less than C30.

5. The anti-floating structure of claim 4, wherein a water stop ring is provided on the upper end of the anchoring bar protruding out of the anchor body.