阅读说明：本技术 一种装配式套筒扩大头土钉装置及其施工方法 (Assembled sleeve enlarged footing soil nail device and construction method thereof ) 是由 汤友生 孙海明 陈磊 赵兵 张建红 于 2020-05-09 设计创作，主要内容包括：本发明涉及一种装配式套筒扩大头土钉装置及其施工方法,装配式套筒扩大头与装配式杆件连接,装配式套筒扩大头包括滑动式套筒、光圆滑杆、上部连杆、下部连杆、固定式限位器、端部固定槽和弹簧；光圆滑杆的一端与装配式杆件的一端通过直螺纹连接头连接,光圆滑杆的另一端处安装端部固定槽；滑动式套筒能沿光圆滑杆上下滑动地套装在光圆滑杆上；弹簧套装在光圆滑杆上,弹簧的一端抵靠住直螺纹连接头,弹簧的另一端抵靠住滑动式套筒；一根上部连杆对应一根下部连杆,两者铰接连接；所述固定式限位器安装在光圆滑杆上,且位于滑动式套筒与端部固定槽之间。本装置用途广泛,可在岩石或土体介质中均可使用。(The invention relates to an assembled sleeve enlarged footing soil nail device and a construction method thereof, wherein the assembled sleeve enlarged footing is connected with an assembled rod piece, and comprises a sliding sleeve, a smooth circular slide bar, an upper connecting rod, a lower connecting rod, a fixed limiter, an end fixing groove and a spring; one end of the smooth circular sliding rod is connected with one end of the assembly type rod piece through a straight threaded connector, and the other end of the smooth circular sliding rod is provided with an end fixing groove; the sliding sleeve can be sleeved on the smooth circular sliding rod in a vertically sliding manner along the smooth circular sliding rod; the spring is sleeved on the smooth circular sliding rod, one end of the spring abuts against the straight threaded connector, and the other end of the spring abuts against the sliding sleeve; one upper connecting rod corresponds to one lower connecting rod, and the upper connecting rod and the lower connecting rod are hinged; the fixed stopper is installed on the smooth circular slide rod and is located between the sliding sleeve and the end fixing groove. The device has wide application and can be used in rock or soil media.)

1. The utility model provides an assembled sleeve enlarged footing soil nailing device, includes assembled member (1), its characterized in that: the assembled type sleeve expansion head (3) is connected with the assembled rod piece (1), and the assembled type sleeve expansion head (3) comprises a sliding type sleeve (3.1), a smooth circular sliding rod (3.2), an upper connecting rod (3.3), a lower connecting rod (3.4), a fixed limiter (3.6), an end fixing groove (3.7) and a spring (3.8); one end of the smooth circular sliding rod (3.2) is connected with one end of the assembly type rod piece (1) through a straight threaded connector (2), and the other end of the smooth circular sliding rod (3.2) is provided with an end fixing groove (3.7); the sliding sleeve (3.1) can be sleeved on the smooth circular sliding rod (3.2) in a vertically sliding manner along the smooth circular sliding rod (3.2); the spring (3.8) is sleeved on the smooth circular sliding rod (3.2), one end of the spring (3.8) abuts against the straight threaded connector (2), and the other end of the spring (3.8) abuts against the sliding sleeve (3.1); the upper connecting rods (3.3) and the lower connecting rods (3.4) are arranged in a plurality of equal numbers, the upper connecting rods (3.3) are uniformly distributed along the circumferential direction of the sliding sleeve (3.1), and one end of each upper connecting rod is hinged with the sliding sleeve (3.1); a plurality of lower connecting rods (3.4) are uniformly distributed along the circumferential direction of the end fixing groove (3.7), and one end of each lower connecting rod is hinged with the end fixing groove (3.7); one upper connecting rod (3.3) corresponds to one lower connecting rod (3.4), and the two connecting rods are hinged; the fixed stopper (3.6) is arranged on the smooth circular sliding rod (3.2) and is positioned between the sliding sleeve (3.1) and the end fixing groove (3.7).

2. The fabricated sleeve enlarged footing soil nailing device of claim 1, wherein: the upper connecting rod (3.3) is hinged with the lower connecting rod (3.4), the upper connecting rod (3.3) is hinged with the sliding sleeve (3.1), and the lower connecting rod (3.4) is hinged with the end fixing groove (3.7) through a connecting pin (3.5).

3. The fabricated sleeve enlarged footing soil nailing device of claim 1, wherein: and the assembly type rod piece (1) is also provided with a centering bracket (1.1).

4. The fabricated sleeve enlarged footing soil nailing device of claim 1, wherein: and an end fixing device (7) is arranged at the other end of the assembly type rod piece (1).

5. The fabricated sleeve enlarged footing soil nailing device of claim 1, wherein: the sliding sleeve (3.1) is a hollow metal sleeve, and the inner diameter of the sliding sleeve is slightly larger than the diameter of the smooth circular sliding rod (3.2); the spring (3.8) is sleeve-type, the inner diameter of the spring is slightly larger than that of the smooth circular slide bar (3.2), and the diameter of the spring (3.8) is slightly smaller than that of the sliding sleeve (3.1); and in the assembled sleeve expansion head (3), the spring (3.8) is in a compressed state.

6. The fabricated sleeve enlarged footing soil nailing device of claim 1, wherein: the length of the sliding sleeve (3.1) sliding up and down is limited by a straight threaded connector (2) at the upper part of the smooth circular sliding rod (3.2) and a fixed limiter (3.6) at the lower part.

7. A method of constructing a fabricated sleeve enlarged head soil nailing device as claimed in any one of claims 1 to 6, wherein: the method comprises the following steps:

the first step is as follows: constructing a standard section soil nail hole (4) in a soil (rock) layer by combining the actual conditions of engineering, and forming an expanded section soil nail hole (5) by adopting a hole expanding device;

the second step is that: the assembly type sleeve expansion head (3) is connected with the assembly type rod pieces (1) through the straight threaded connectors (2), the number of the assembly type rod pieces (1) is selected according to actual requirements, and the assembly type rod pieces (1) are connected with the assembly type rod pieces (1) through the straight threaded connectors (2);

the third step: the device connected in the second step is placed into a soil nail hole (4) of a standard section, at the moment, the assembled sleeve expansion head (3) is in a contraction state, the spring (3.8) is in a compressed state until the assembled sleeve expansion head (3) enters the soil nail hole (5) of an expansion section, the spring (3.8) is not compressed any more, then the sliding sleeve (3.1) slides downwards along the smooth circular sliding rod (3.2) under the thrust of the spring (3.8) until the sliding sleeve abuts against the fixed stopper (3.6), the upper connecting rod (3.3) and the lower connecting rod (3.4) are driven to expand to slide downwards, and the device is expanded to form an expansion head; the diameter of the standard section soil nail hole (4) of the enlarged head is limited, so that the soil nail cannot be pulled out;

the fourth step: and (3) checking and adjusting the position and the expansion state of the soil nail, pouring concrete (6) from inside to outside, and fixing the outermost end part of the assembly type rod piece (1) by adopting an end part fixing device (7) after the concrete strength meets the design requirement.

Technical Field

The invention relates to the field of civil and architectural engineering, in particular to an assembled sleeve enlarged head soil nail device and a construction method thereof.

Background

At present, soil nails are adopted in the fields of foundation pit and side slope support and the like as a reinforcing measure, the soil nails can reinforce rock and soil mass and enhance the integrity of a slope body, and the soil nails are widely used at present. However, the ultimate anti-pulling bearing capacity provided by the soil nails in the design and construction is often an important factor restricting the supporting effect. The earth nails most commonly used today are often plain rebar, and steel pipes and steel strands can also be used as earth nails in construction. The pullout resistance provided by these commonly used soil nails mainly depends on the diameter of the anchoring body, the limited bonding strength of the soil (rock) layer and the anchoring length, so when the soil layer is relatively definite, in order to ensure the pullout resistance, the size of the soil nail body is often required to be increased or lengthened, which increases the construction difficulty and increases the engineering cost, for example, in patent application with publication number CN 107304565A: the above disadvantages exist in a recoverable soil nailing reinforcing steel bar structure.

Therefore, there is a need for improvements and optimizations to existing earth nails.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides an assembled sleeve enlarged footing soil nail device which is reasonable and simple in structural design and can provide larger pulling resistance, and a construction method.

The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides an assembled sleeve enlarged footing soil nailing device, includes assembled member, its characterized in that: the assembled sleeve expansion head is connected with the assembled rod piece and comprises a sliding sleeve, a smooth circular sliding rod, an upper connecting rod, a lower connecting rod, a fixed limiter, an end fixing groove and a spring; one end of the smooth circular sliding rod is connected with one end of the assembly type rod piece through a straight threaded connector, and the other end of the smooth circular sliding rod is provided with an end fixing groove; the sliding sleeve can be sleeved on the smooth circular sliding rod in a vertically sliding manner along the smooth circular sliding rod; the spring is sleeved on the smooth circular sliding rod, one end of the spring abuts against the straight threaded connector, and the other end of the spring abuts against the sliding sleeve; the upper connecting rod and the lower connecting rod are arranged in equal number, the upper connecting rods are uniformly distributed along the circumferential direction of the sliding sleeve, and one end of each upper connecting rod is hinged with the sliding sleeve; the plurality of lower connecting rods are uniformly distributed along the circumferential direction of the end part fixing groove, and one end of each lower connecting rod is hinged with the end part fixing groove; one upper connecting rod corresponds to one lower connecting rod, and the upper connecting rod and the lower connecting rod are hinged; the fixed stopper is installed on the smooth circular slide rod and is located between the sliding sleeve and the end fixing groove.

Preferably, the hinge joint between the upper connecting rod and the lower connecting rod, the hinge joint between the upper connecting rod and the sliding sleeve, and the hinge joint between the lower connecting rod and the end fixing groove are all through connecting pins.

Preferably, the assembled rod piece is further provided with a centering bracket.

Preferably, the other end of the fabricated rod is provided with an end fixing device.

Preferably, the sliding sleeve is a hollow metal sleeve, and the inner diameter of the sliding sleeve is slightly larger than the diameter of the smooth rod. The spring is sleeve type, the inner diameter of the spring is slightly larger than the diameter of the smooth rod, and the diameter of the spring is slightly smaller than the inner diameter of the sliding sleeve; and in the assembled sleeve expansion head, the spring is in a compressed state.

Preferably, the length of the sliding sleeve sliding up and down is limited by a straight threaded connector at the upper part of the smooth circular sliding rod and a fixed limiter at the lower part of the smooth circular sliding rod.

The invention also provides a construction method of the assembled sleeve enlarged head soil nail device, which comprises the following steps:

the first step is as follows: constructing standard section soil nail holes in a soil (rock) layer by combining the actual conditions of engineering, and forming enlarged section soil nail holes by adopting a hole expanding device;

the second step is that: the assembly type sleeve expansion head and the assembly type rod piece are connected together through the straight threaded connectors, the number of the assembly type rod pieces is selected according to actual needs, and the assembly type rod pieces are connected together through the straight threaded connectors;

the third step: putting the device connected in the second step into a soil nail hole of a standard section, wherein the expansion head of the assembled sleeve is in a contraction state, the spring is in a compressed state until the expansion head of the assembled sleeve enters the soil nail hole of the expansion section, the spring is not compressed any more, then the sliding sleeve slides downwards along the smooth circular sliding rod under the thrust of the spring until the sliding sleeve abuts against the fixed limiter, and drives the upper connecting rod and the lower connecting rod to be unfolded to slide downwards, and the device is unfolded to form the expansion head; the diameter of the standard section soil nail hole of the enlarged head is limited, so that the soil nail cannot be pulled out;

the fourth step: and checking and adjusting the position and the expansion state of the soil nail, pouring concrete from inside to outside, and fixing the outermost end part of the assembled rod piece by adopting an end part fixing device after the concrete strength meets the design requirement.

Compared with the prior art, the invention has the following advantages and effects:

1. the assembled sleeve enlarged footing soil nail device and the construction method thereof are provided, the spring has certain flexibility, the sliding sleeve can be pushed downwards along the smooth circular sliding rod during assembly, and the assembled sleeve enlarged footing can be kept in an open state without external restraint; when the soil nails are inserted into the soil nail holes of the standard section, according to the characteristics of the actual soil (rock) layer, the soil nail system can be matched with the steel casing for use, so that the device can smoothly enter the soil (rock) layer, and can push the lower connecting rod, the connecting pin and the upper connecting rod to push the sliding sleeve to move upwards under the constraint action of the external environment space, so that the expansion head of the assembled sleeve is changed into a contraction state from an expansion state and smoothly enters the soil nail holes of the standard section; when the assembled sleeve expansion head enters the expansion section soil nail hole, the spring pushes the sliding sleeve downwards due to the release of the external space, the assembled sleeve expansion head is changed from a contraction state to an expansion state again, and the expansion head can realize self-locking in the expansion section soil nail hole, so that the expansion reliability of the expansion head is ensured;

2. the combination of the enlarged head and the concrete can greatly improve the uplift resistance of the soil nail, fully play the interaction between a soil (rock) body and a structure and enhance the supporting or reinforcing effect; thereby reducing the length or diameter of the conventional soil nail and lowering the construction cost;

3. the device has wide application, can be used in rock or soil media, can be used as a soil nail, and can also be used as an anchor rod or an anchor cable by applying prestress;

4. the device is assemblability, and installation and construction are simple, and the transportation is also very convenient.

Drawings

In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive effort.

Fig. 1 is an enlarged view of an assembled sleeve enlarged head soil nail device according to an embodiment of the present invention.

Figure 2 is a schematic view of the connection at the sliding sleeve in an embodiment of the invention.

FIG. 3 is an enlarged three-dimensional view of a fabricated sleeve enlarged head soil nail device in an embodiment of the present invention.

Fig. 4 is a view illustrating a construction method of the fabricated sleeve enlarged head soil nailing device.

Description of reference numerals:

an assembled rod member 1; 1.1 of a centering bracket;

a straight thread connector 2;

the assembled sleeve expansion head 3; a sliding sleeve 3.1; a smooth circular slide bar 3.2; an upper link 3.3; a lower link 3.4; a connecting pin 3.5; a fixed stopper 3.6; end fixing slots 3.7; 3.8 of a spring;

a standard section soil nail hole 4; enlarging the section soil nail hole 5; concrete 6; an end fixture 7.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.