CN204060727U - For steel pipe truss grouting and reinforcing and the supporting and protection structure of heavily stressed weak broken wall rock - Google Patents

Abstract

The utility model discloses a steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rocks, which comprises a five-way joint, a push rod, a support rod, a shoulder rod and a grouting anchor rod. It includes five interconnected interfaces. The ejector bar, side bar, shoulder bar and grouting anchor are installed on the five interfaces and together form a bracket centered on the five-way joint. Connect the four above-mentioned brackets together to form the following A square frame structure with four bottom bracket joints as vertices, each square frame is provided with a square frame with the same structure on both sides of the axis direction of the first joint of the bottom bracket joint, and two adjacent square frames are connected by shoulders. The rods are joined together to form a multi-joint structure based on a single square frame. The utility model has the advantages of large initial support, high support strength, good integrity, large support control top area, strong surface protection ability, convenient and simple construction, safety and reliability, and can greatly improve the stability of loose surrounding rock.

Description

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

technical field

The utility model 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 utility model provides a steel pipe truss grouting reinforcement and support structure with high support strength, good integrity, convenient and simple construction, and safety and reliability for high-stress weak and broken surrounding rock.

The technical solution of the utility model to solve the above 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, side 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 second The three interfaces 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 four joints, a shoulder rod is installed on the first joint and the second joint of the five-way joint, and one end of the grouting bolt is installed on the fifth joint 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, and the five-way joint and the support rod, ejector rod, shoulder rod and grouting anchor rod installed on the five-way joint together form a The support centered on the five-way joint, the four above-mentioned supports are arranged in a square shape and connected together by the ejector rod and the side bar to form a square frame structure with the four five-way joints as the vertices. The grouting anchors on the four five-way joints The rods are all facing the outside of the square frame, and each square frame is provided with a square frame with the same structure on both sides along the axis direction of the first interface of the bottom bracket joint, and the adjacent two square frames are connected together by shoulder rods 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 utility model not only exerts the anchoring effect 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 utility model adopts a high-strength hollow steel pipe 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; the subsequent anchor rod and grouting Reinforcement greatly improves the integrity of the broken rock mass and improves the bearing capacity of the rock mass;

Second, the overall performance of the structure is good, and the pressure resistance is strong. The utility model adopts a truss type frame structure, and its main components are hollow steel pipes and grouting anchors with high strength. After grouting, its strength will be further improved. This high-strength hollow steel pipe and grouting anchors The truss structure formed by the rods 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 utility model 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 utility model 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. , convenient construction, suitable for various complex geological conditions.

Description of drawings

Fig. 1 is the structural representation of the utility model.

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 ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

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

As shown in Fig. 1 and Fig. 2, the utility model 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, 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 are 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 angle between the fifth interface 1-5 and the third interface 1-3, the fourth interface 1-4 is 135°, the plane where the third interface 1-3, the fourth interface 1-4, and the fifth interface 1-5 are located Perpendicular to 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 side bar 3 is installed on the fourth interface 1-4 of the bottom bracket joint 1. A shoulder bar 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 5 is installed on the fifth interface 1-5 of the five-way joint 1, and the other end Fastened 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 , ejector rod 2, shoulder rod 4, and grouting anchor rod 5 together form a bracket with the five-way joint 1 as the center. A square frame structure with four five-way joints 1 as the apex, 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 along the axis direction of the first interface 1-1 of the five-way joint 1 A square frame with the same structure is arranged on both sides respectively, and two adjacent square frames are connected together 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. A steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rock, characterized in that: it includes a five-way joint, a push rod, a support rod, a shoulder rod and a grouting anchor rod, and the five-way joint The 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, the third interface, the fourth The interfaces 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. A shoulder rod is respectively 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 grouting anchor rod, the shoulder rod and the support rod are all hollow steel pipes, and the five-way joint, the support rod, the ejector rod, the shoulder rod and the grouting anchor rod installed on the five-way joint form a joint centered on the five-way joint. The four above-mentioned brackets are arranged in a square shape and connected together by push rods and side rods to form a square frame structure with four five-way joints as vertices, and the grouting anchor rods on the four five-way joints are all facing the square frame Outside, each square frame is provided with a square frame with the same structure on both sides of the axis direction of the first joint of the bottom bracket joint, and two adjacent square frames are connected together by shoulder rods to form a single square frame based polymorphic structure. 2. The steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rocks as claimed in claim 1, characterized in that: the five joints of the five-way joint are provided with internal threads, and the top Both ends of the rod, the shoulder rod, and the side rod are provided with external threads matching the internal threads, and one end of the grouting anchor rod is provided with external threads matching the internal threads. 3. The steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rocks as claimed in claim 2, characterized in that: said grouting bolt is sleeved with backing plates and nuts, said grouting anchor External threads matching the internal threads of the nut are provided on the outer surface of the slurry anchor rod. 4. The steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rocks according to claim 3, characterized in that: the backing plate is a concave backing plate. 5. The steel pipe truss grouting reinforcement and support structure for high-stress weak and broken surrounding rock as claimed in claim 1, characterized in that: in the five-way joint, the fifth interface, the third interface, and the fourth interface Located in the same plane and the included angle between the fifth interface, the third interface and the fourth interface is 135°.