CN104265329B - Steel pipe truss grouting reinforcement and support structure for high stress weak and broken surrounding rock - Google Patents

Abstract

The invention discloses a kind of steel pipe truss grouting and reinforcing for heavily stressed weak broken wall rock and supporting and protection structure, comprise five-way joint, push rod, side bar, shoulder bar and grouted anchor bar, described five-way joint comprises five interfaces interconnected, push rod, side bar, shoulder bar and grouted anchor bar are arranged on five interfaces and also jointly form a support centered by five-way joint, the quadra structure that to be joined together to form with four five-way joints by four above-mentioned supports be summit, each quadra is respectively equipped with a quadra identical with its structure along the axis direction both sides of five-way joint first interface, the concatemer structure based on single quadra is joined together to form by shoulder bar between two adjacent quadras.The present invention has that initial supporting is large, supporting intensity is high, good integrity, supporting control top area are large, protect the advantage that table ability is strong, easy construction is simple and safe and reliable, can increase substantially loose wall rock stability.

Description

Steel pipe truss grouting reinforcement and support structure for high stress weak and broken surrounding rock

technical field

The invention relates to the field of underground mining, in particular to a steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rock.

Background technique

There are many goafs caused by the early mining of underground mining, and with the deepening of the mine, the mining environment will become more and more complex. Loose and broken surrounding rock masses are often encountered in the excavated roadways. The overall performance of this loose surrounding rock mass Poor, limited bearing capacity, under the action of high ground stress and disturbance stress, it may lead to the phenomenon of collapse or large deformation with excavation.

At present, when excavating and maintaining roadways with loose surrounding rock masses, pile wedges, advanced anti-bottom arches are generally used to fix anchor rods and pipe sheds, and pre-grouting are used for advanced support. It has played an important role in maintaining and ensuring the construction safety of workers, but the shortcomings of these technologies, such as complex operation, small scope of application and high cost, make it difficult to be widely used in coal mine fracture zones, and after tunneling and support Due to the high loosening pressure, it is easy to make the surrounding rock unstable or the roof fall, especially in the high-stress broken rock mass. It is very easy to create a large number of kick drums.

Contents of the invention

In order to solve the above technical problems, the present invention provides a steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rock with high support strength, good integrity, convenient and simple construction, and safety and reliability.

The technical solution of the present invention to solve the above-mentioned problems is: a steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rocks, including five-way joints, ejector rods, support rods, shoulder rods and grouting anchor rods, The five-way joint includes a first interface, a second interface, a third interface, a fourth interface and a fifth interface, and the five interfaces communicate with each other, wherein the first interface and the second interface are located on the same axis, and the third The interface and the fourth interface are perpendicular to each other and the plane where the third interface and the fourth interface are located is perpendicular to the axis of the first interface. On the interface, a shoulder rod is installed on the first interface and the second interface of the five-way joint, and one end of the grouting anchor rod is installed on the fifth interface of the five-way joint, and the other end is fastened in the surrounding rock of the roadway. The ejector rod, grouting anchor rod, shoulder rod and support rod are all hollow steel pipes. The bracket with the joint as the center, the four above-mentioned brackets are arranged in a square and connected together by the ejector rod and the support rod to form a square frame structure with the four five-way joints as the apex. The grouting anchor rods on the four five-way joints They all face the outside of the square frame, and each square frame is provided with a square frame with the same structure on both sides of the axis of the first joint of the bottom bracket joint, and two adjacent square frames are connected together by shoulder bars to form a Multi-joint structure based on a single square frame.

In the above-mentioned steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rock, the five joints of the five-way joint are provided with internal threads, and the two ends of the ejector rod, shoulder rod, and side rod are all An external thread matching the internal thread is provided, and one end of the grouting anchor rod is provided with an external thread matching the internal thread.

In the above-mentioned steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rock, the grouting anchor is provided with a backing plate and a nut, and the outer surface of the grouting anchor is provided with a The internal thread of the above nut matches the external thread.

In the steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rock, the backing plate is a concave backing plate.

In the steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rock, in the five-way joint, the fifth interface, the third interface, and the fourth interface are located in the same plane, and the fifth interface and the third The angle between the interface and the fourth interface is 135°.

Compared with the prior art, the present invention not only exerts the anchor grouting function of the hollow steel pipe grouting and the bolt grouting, but also exerts the overall stabilizing effect of the hollow steel pipe truss. The specific performance is as follows:

First, the initial supporting force is large, which can effectively improve the stability of loose surrounding rock. The invention adopts high-strength hollow steel pipes to form a truss-type grouting reinforcement and support structure, which can quickly form a strong frame structure during support, and can effectively prevent the surrounding rock from further loosening; subsequent anchor rods and grouting reinforcement The integrity of the broken rock mass is greatly improved, and the bearing capacity of the rock mass is improved;

Second, the overall performance of the structure is good, and the pressure resistance is strong. The present invention adopts the truss type of frame structure, and its main components are hollow steel pipes and grouting anchor rods with high strength. After grouting, the strength will be further improved. The formed truss structure not only has good integrity, but also has a very strong ability to resist surrounding rock pressure;

Third, the structure is simple and the installation is convenient. The main component of the present invention is a hollow steel pipe and a grouting anchor rod. When assembling, the hollow steel pipe and the grouting anchor rod can be connected only through the five-way joint, and the installation is easier to grasp;

Fourth, strong adaptability. The shape of the ejector rod of the present invention is designed according to the outline of the roadway, which is not only suitable for rectangular roadways, but also suitable for other shapes such as round roadways, and each bracket is connected by a hollow steel pipe and a grouting anchor rod as the main body. It is convenient for construction and is suitable for various complex geological conditions.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic structural diagram of the five-way joint in Fig. 1 .

Fig. 3 is a structural schematic diagram of the grouting anchor rod in Fig. 1 .

Fig. 4 is a structural schematic diagram of the ejector rod and the side rod in Fig. 1 .

detailed description

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

All components of the present invention are high-strength, high-rigidity steel materials, and the shape and size of the components are made according to the profile of the roadway. In this example, only the rectangular roadway is used for introduction:

As shown in Fig. 1 and Fig. 2, the present invention includes a five-way joint 1, a push rod 2, a support bar 3, a shoulder bar 4 and a grouting anchor rod 5, and the five-way joint 1 includes a first interface 1-1, a first The second interface 1-2, the third interface 1-3, the fourth interface 1-4 and the fifth interface 1-5 and the five interfaces communicate with each other, wherein the first interface 1-1, the second interface 1-2 Located on the same axis, the fifth interface 1-5, the third interface 1-3, and the fourth interface 1-4 are located in the same plane, and the third interface 1-3 and the fourth interface 1-4 are perpendicular to each other in this plane, The included angle between the fifth interface 1-5 and the third interface 1-3 and the fourth interface 1-4 is 135°, and the plane where the third interface 1-3, the fourth interface 1-4, and the fifth interface 1-5 are located is vertical On the axis of the first interface 1-1, the ejector rod 2 is installed on the third interface 1-3 of the bottom bracket joint 1, and the auxiliary rod 3 is installed on the fourth interface 1-4 of the bottom bracket joint 1. A shoulder rod 4 is respectively installed on the first interface 1-1 and the second interface 1-2 of the joint 1, and one end of the grouting anchor rod 5 is installed on the fifth interface 1-5 of the five-way joint 1, and the other end is tightly Fixed in the surrounding rock of the roadway, the ejector rod 2, the grouting anchor rod 5, the shoulder rod 4 and the support rod 3 are all hollow steel pipes, the five-way joint 1 and the support rod 3 installed on the five-way joint 1, The ejector bar 2, the shoulder bar 4, and the grouting anchor bar 5 together form a bracket with the five-way joint 1 as the center. The five-way joint 1 is a square frame structure with the apex, and the grouting anchor rods 5 on the four five-way joints 1 are all facing the outside of the square frame, and each square frame is two-way along the axial direction of the first interface 1-1 of the five-way joint 1. Each side is provided with a square frame with the same structure, and two adjacent square frames are connected by shoulder bars 4 to form a multi-joint structure based on a single square frame.

As shown in Figure 2, the five interfaces of the five-way joint 1 are provided with internal threads 6, and the two ends of the push rod 2, the shoulder rod 4, and the support rod 3 are all provided with matching internal threads 6. An external thread, one end of the grouting anchor rod 5 is provided with an external thread matching the internal thread 6 .

As shown in Figure 3, the grouting anchor rod 5 is covered with a concave backing plate 7 and a nut 8, the concave backing plate 7 has a certain pressure-relieving performance, and the outer surface of the grouting anchor rod 5 is provided with There are external threads matching the internal threads of the nut 8 .

Construction method: Drill holes in the shoulder of the roadway roof inclined at 45 degrees upwards and drill holes at the foot of the roadway inclined downwards at 45 degrees, clean the drilled holes, install the grouting anchor rod 5 and the backing plate 7, tighten the nuts 10, and expose the grouting The end of the anchor rod 5 is externally threaded, and then the fifth interface 1-5 of the five-way joint 1 is used to connect the end of the grouting anchor rod 5. After the connection is stable, the position of the five-way joint 1 is corrected, and the ejector rod 2 and the support rod 3 are connected. , shoulder bar 4 and bottom bracket joint 1 are connected, bottom bracket joint 1 and support bar 3, ejector bar 2, shoulder bar 4 and grouting anchor rod 5 installed on bottom bracket joint 1 jointly form a bottom bracket joint 1 as In the central bracket, multiple brackets are connected together to form a conjoined structure based on a single bracket square frame.

Claims (5)

1. the steel pipe truss grouting and reinforcing for heavily stressed weak broken wall rock and supporting and protection structure, it is characterized in that: comprise five-way joint, push rod, side bar, shoulder bar and grouted anchor bar, described five-way joint comprises first interface, second interface, 3rd interface, 4th interface and the 5th interface and five interfaces interconnect each other, wherein first interface, second interface is positioned on same axis, 3rd interface, orthogonal and the 3rd interface of 4th interface, 4th interface place plane orthogonal is in the axis of first interface, described push rod is arranged on the 3rd interface of five-way joint, side bar is arranged on the 4th interface of five-way joint, the first interface of five-way joint, second interface is separately installed with a shoulder bar, one end of grouted anchor bar is arranged on the 5th interface of five-way joint, the other end is anchored in roadway surrounding rock, described push rod, grouted anchor bar, shoulder bar and side bar are hollow steel tube, described five-way joint and the side bar be arranged on five-way joint, push rod, shoulder bar, grouted anchor bar forms a support centered by five-way joint jointly, be square four above-mentioned supports arrangement by push rod and the side bar quadra structure that to be joined together to form with four five-way joints be summit, grouted anchor bar on four five-way joints is all towards the outside of quadra, each quadra is respectively equipped with a quadra identical with its structure along the axis direction both sides of five-way joint first interface, the concatemer structure based on single quadra is joined together to form by shoulder bar between two adjacent quadras.

2. as claimed in claim 1 for steel pipe truss grouting and reinforcing and the supporting and protection structure of heavily stressed weak broken wall rock, it is characterized in that: in five interfaces of described five-way joint, be provided with internal thread, the two ends of described push rod, shoulder bar, side bar are equipped with the external screw thread mated with described internal thread, and one end of described grouted anchor bar is provided with the external screw thread mated with described internal thread.

3. as claimed in claim 2 for steel pipe truss grouting and reinforcing and the supporting and protection structure of heavily stressed weak broken wall rock, it is characterized in that: described grouted anchor bar is arranged with backing plate and nut, the external surface of described grouted anchor bar is provided with the external screw thread mated with the internal thread of described nut.

4., as claimed in claim 3 for steel pipe truss grouting and reinforcing and the supporting and protection structure of heavily stressed weak broken wall rock, it is characterized in that: described backing plate is inner concave shape backing plate.

5. as claimed in claim 1 for steel pipe truss grouting and reinforcing and the supporting and protection structure of heavily stressed weak broken wall rock, it is characterized in that: in described five-way joint, the 5th interface, the 3rd interface, the 4th interface are positioned at same plane and the angle of the 5th interface and the 3rd interface, the 4th interface is 135 °.