CN203247478U - Composite structure pavement with reinforced geocells for hardening underworkings baseplate - Google Patents

Abstract

The utility model discloses a road surface with a reinforced cell composite structure for hardening the floor of an underground roadway. A leveling layer is laid on the bottom plate of the roadway, and a layer of reinforced cells is laid on the leveling layer. The reinforced cells are filled with special concrete materials and surfaces, and the reinforced cells are made of reinforced cells. The rib cell and the filling material in the cell are composed. Moreover, due to the joint action of the filling material and the reinforced cell, the bearing capacity of the pavement is increased, and the cracking and damage of the conventional plain concrete pavement are greatly avoided. It has the advantages of simple structure, convenient and fast construction, strong impact resistance of the pavement, and low cost It is widely used in coal mine roadway floor hardening and special road pavement engineering.

Description

A reinforced cell composite structure pavement with hardened underground roadway floor

technical field

The utility model relates to a pavement structure and material used for hardening the floor of a coal mine roadway, in particular to a pavement with a reinforced cell composite structure for hardening the floor of an underground roadway. the

Background technique

As an important primary energy source, coal accounts for more than 70% of my country's energy structure. The production and economic conditions of the coal industry have a decisive influence on the development of the national economy. the

The safety and smoothness of the tunnel in the coal mining face is the key to ensure the smooth implementation of equipment installation, transportation, ventilation, etc. in the mining face. Protection is essential for its safe use. However, the trough floor of the coal mining face is responsible for the safe operation of manpower, various transportation vehicles, especially heavy vehicles, and transportation systems such as rails and belts. Whether it can meet the requirements of production depends to a large extent on the The smooth implementation of the mining face has had a great impact and has attracted great attention from mining workers. the

In recent years, due to the deepening of the mining depth, the geological conditions of the coal seam and the characteristics of the surrounding rock have become more and more complex, and the support of the working face along the channel has become more and more difficult. In addition, there is no practical and effective comprehensive treatment method for the prevention and control of floor diseases, which have brought great difficulties to the safe production of coal mines. the

There are many reasons for the failure of the floor of the channel. One is the influence of the lithology of the floor. Most of the strata traversed by the coal mine roadway are sedimentary rock strata, clay rocks (mudstone, shale) containing expansive minerals. Before excavation, the mudstone is in a state of mechanical equilibrium. After excavation, the surrounding rock is disturbed, and several situations may occur in the floor mudstone: ① The rock layer cracks along the bedding layer or the joint fissure surface; Due to the two-dimensional stress state, floor fracture zones appear due to the impact of mining; ③ exposed to the air, it is easy to weather and disintegrate, which is closely related to the composition of mudstone; ④ flooding effects such as water gushing in roadways and roof and floor. These conditions cause the mudstone to experience water loss-loading-water absorption-disintegration-mudification. Due to mud rock mudification, the floor along the trough almost lost its bearing capacity, seriously affecting the passage of vehicles in the underground roadway. the

Second, with the continuous development of mining technology, large-scale and heavy equipment have been widely used in the development process of the tunnel roadway. The unevenness makes driving difficult or even unable to meet the normal passage of equipment transport vehicles on the working face, which directly affects the safe transportation of the working face and the rapid installation of equipment. the

The existing concrete road structure is a pavement structure formed by directly pouring concrete on the compacted roadbed. Cement concrete pavement has been used earlier in my country and has a wide range of applications. Expressways, urban roads, airport runways, station wharves Cement concrete pavement can be laid on roads, country roads, etc. the

At present, the hardening method of the bottom slab of the coal mining face is mainly carried out by laying ordinary concrete with a thickness of about 300mm. In order to prevent the deformation and damage of the concrete, steel mesh is sometimes added to strengthen the bottom slab, which solves the above problems to a large extent. However, this method has the following defects: (1) The hardening of the bottom plate takes a long time, which affects the progress of the project; (2) The transportation volume of materials is large and the cost is high; (3) Once the bottom plate is deformed and damaged by the bottom drum, it will bring great damage to the bottom. big difficulty. Therefore, the traditional way of floor hardening along the groove is not conducive to the production of modern mines to a large extent. the

Contents of the invention

The purpose of the utility model is to provide a kind of reinforced cell composite structure pavement with simple structure, fast construction, large pavement bearing capacity and strong impact resistance. the

In order to overcome the deficiencies of the prior art, the technical solution of the utility model is solved as follows: a reinforced cell composite structure pavement of the hardened underground roadway floor, the pavement is composed of a filler surface layer, a reinforced cell layer, a leveling layer, road base, the utility model is special in that a leveling layer is laid on the road base, a layer of reinforced cells is laid on the leveling layer, and a layer of filler is laid on the reinforced cells The surface layer, and the reinforced cell layer is composed of the reinforced cell and the filling material in the cell. the

The single grid length of the reinforced cell is length×width×height=170mm˜200mm×170mm˜200mm×75mm˜150mm. the

The thickness of the filler surface layer is 20mm-30mm. the

The filling material and the filling surface layer are special dry hard concrete. the

The reinforced cell is composed of at least 10 grids welded or riveted to each other. the

Compared with the prior art, the utility model has the characteristics of simple structure, strong impact resistance, relatively small thickness of road surface, material saving, convenient repair, small water-cement ratio of reinforced cell concrete, and low shrinkage rate of concrete , due to the effect of reinforced cells in the structure, the crack resistance of the pavement under load is enhanced, which greatly overcomes the defect of low crack resistance of plain concrete, and makes the concrete pavement change from a rigid pavement to a semi-rigid pavement. Joints are not required to prevent cracks from concrete shrinkage deformation. the

Description of drawings

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

Fig. 2 is a top view structural schematic diagram of the reinforced cell of Fig. 1;

Fig. 3 is the intensity-vertical displacement curve diagram of the structure different cell specimens of Fig. 1;

Figure 4 The strength-longitudinal displacement curve of the structure under load;

The relation diagram of the load of Fig. 5 structure body and base layer pressure;

The stress-strain curve diagram of the long side direction of the structure in Fig. 6;

Figure 7 Stress-strain curves in the short side direction of the structure.

Detailed ways

Accompanying drawing is the embodiment of the utility model pavement structure. the

Below in conjunction with accompanying drawing, content of the invention is described in further detail:

With reference to Fig. 1, shown in Fig. 2, a kind of reinforced cell composite structure pavement of hardened underground roadway floor, this pavement is made up of filler surface layer, reinforced cell layer, leveling layer, road base, is characterized in that described road A leveling layer 4 is laid on the base layer 5, a layer of reinforced cell layer 3 is laid on the leveling layer 4, and a layer of filler surface layer 1 is laid on the reinforced cell layer 3. The cell layer 3 is composed of the filling material in the reinforced cell 2 and the cell.

The single grid length of the reinforced cell 2 is length×width×height=170mm˜200mm×170mm˜200mm×75mm˜150mm. the

The thickness of the filler surface layer is 20mm-30mm. the

The filling material and the filler surface layer 1 are special dry hard concrete, and the special dry hard concrete is different from general dry hard concrete in terms of its proportion and performance requirements. the

The reinforced cell is composed of at least 10 grids welded or riveted with steel bars. the

The bottom layer is the leveling layer, which is leveled with sand and gravel; the upper layer is the reinforced cell layer of 70mm to 150mm, and the reinforced cell is laid first, and a certain proportion of special dry hard concrete is filled inside; the uppermost layer It is a filler surface layer of 20mm to 30mm, and the filler surface layer is paved at the same time when filling the reinforced cell layer. the

The filling material in the reinforced cell and the filling surface layer 1 are filled with concrete with a special ratio. In the special dry hard concrete, the content of fly ash is 5% to 10%, and the content of lime is 1.5% to 3.6%. The cement content is 4% to 12%, the sand content is 35% to 40%, the gravel content is 40% to 45%, the water content is 0.7% to 1.2%, and the water cement ratio of the filling material shall not exceed 0.5. The special dry hard concrete is poured into the reinforced cell or on the filler surface layer 1, and is repeatedly rolled by a road roller, so that no cracks are generated on the entire road surface and maintenance is not required. Therefore, the construction speed is increased. the

The strength and deformation characteristics of the single cell test piece of the composite structure of the utility model:

For standard specimens with different proportions of filling materials, under load, the vertical displacement and lateral displacement show the same law. Figure 3 shows the strength-vertical displacement curve of the specimen for 28 days under a certain proportion.

Figure 3 28-day strength-vertical displacement curves of different structural specimens

It can be seen from Fig. 3 that for the unreinforced cell specimens, the initial loading is in the elastic stage, and after the peak load, the strength decreases rapidly, the bearing capacity drops significantly, and no large deformation occurs, which belongs to brittle failure. , this form of failure reduces the later bearing capacity of the pavement; for the welded and riveted reinforced cell specimens, due to the lateral constraints of the reinforcement format, the strength is partially improved. The axial displacement changes slowly, and the displacement change accelerates with the continuous increase of the load. After the peak load, the plastic stage of the specimen is prolonged, the residual strength is obviously improved, and the displacement begins to increase significantly until the reinforced cell is destroyed. It can be seen from this that, for a single specimen, the effect of the reinforced cell can significantly enhance the residual strength of the specimen, improve the plastic deformation of the specimen, and have a significant effect on the later-stage bearing capacity of the specimen.

Test of the bearing plate of the composite structure of the utility model

1. Pavement bearing capacity-displacement curve analysis

Fig.4 Bearing capacity-longitudinal displacement curves of two structures under load

It can be seen from Figure 4 that the longitudinal displacements of specimens with different mix ratios under load are different. Among them, the cell layer strength of structure No. 1 is higher than that of structure No. 2. Under the same load, structure No. 1 The longitudinal displacement of the body is smaller than that of the No. 2 structure. At the same time, it can be seen that with the increase of load, the longitudinal displacement of No. 1 structure increases slowly, and there is no obvious yield when it is damaged; while the low-strength mix ratio adopted by No. 2 structure, under the load, the longitudinal displacement It grows faster, and when it breaks, it has obvious yield.

From the damage situation, it can be seen that the base concrete is broken and spalled, while the upper concrete is only cracked on the surface due to the effect of the reinforced cell, but it is still intact, indicating that the lateral restraint of the reinforced cell plays an obvious role . the

2. The relationship between pavement bearing capacity and grass-roots pressure

Figure 5 shows the relationship between the bearing capacity of the pavement and the pressure of the base of the two structures of the utility model. It can be seen from the figure that as the load increases, the number of pressure representations increases gradually. Since the position of the pressure gauge is located directly below the base, it shows that after the geocell is laid, it plays a role of stress diffusion, so that the stress on the base under the bearing plate spreads to its surroundings. Due to the different proportions of the cell layers, different structures have different stresses on the bottom under the same load. A structure with a high cell layer strength corresponds to a lower bottom pressure, while a structure with a low cell layer strength Corresponding to the higher pressure at the bottom. It shows that the difference in the strength of the surface layer has a significant impact on the stress state of the base layer. The strength of the surface layer is high, the force of the base layer is small, and the strength of the surface layer is low, and the force of the base layer is large.

3. Stress-strain curve analysis of adjacent structural parts

Figures 6 and 7 show the stress-strain curves of the long and short sides of the base of the structure of the utility model. As can be seen from Figures 6 and 7, under load, both sides of the test piece deform, and The maximum strain in the side direction is smaller than the maximum strain in the short side direction, indicating that the farther away from the bearing plate, the smaller the strain value and the smaller the stress. Moreover, during the whole loading process, the transverse strain of the specimen is greater than the longitudinal strain, indicating that due to the lateral restriction of the reinforced cell, the internal transverse stress of the specimen is greater than the vertical stress.

Engineering application

Aiming at the safety and effectiveness of the composite structure pavement of the utility model, quick and easy construction, an industrial test was carried out to check whether the process matching and mechanical equipment parameters implemented in the scheme are reasonable. Investigate whether the designed composite structure pavement can achieve the expected goal.

The industrial test adopts a single grid length × width × height of the reinforced cell = 200mm × 200mm × 100mm, the compressive strength of the filling material and surface material is 25MPa, and the thickness of the road surface is 120~150mm. During the specified period after pavement was completed, testing and observation were carried out. Through sampling test analysis, all indicators met the design requirements, and under the repeated rolling of heavy-duty vehicles, the entire pavement did not produce cracks or damage. Condition. the

To sum up, the special concrete composite pavement structure with reinforced cells of the utility model shows good characteristics in terms of impact resistance and bearing capacity, and its special force characteristics can effectively reduce the impact of base void on the pavement structure. Negative Effects. Therefore, the utility model reinforced cell concrete composite structural surface has high application value in the hardening of coal mine roadway floor, and is also of great significance in promoting the development of road pavement structure and materials. the

Claims (5)

1. A reinforced cell composite structure pavement of a hardened underground roadway floor, the pavement is composed of a filler surface layer, a reinforced cell layer, a leveling layer, and a road base, and is characterized in that the pavement is laid on the road base (5) A leveling layer (4), a reinforced cell layer (3) is laid on the leveling layer (4), and a filler surface layer (1) is laid on the reinforced cell layer (3) , the reinforced cell layer (3) is composed of the reinforced cell (2) and the filling material in the cell. 2. The reinforced cell composite structure pavement of a hardened underground roadway floor according to claim 1, characterized in that the single grid length of the reinforced cell is length×width×height=170mm～200mm×170mm～200mm× 75mm ~ 150mm. 3. The pavement with reinforced cell composite structure of hardened underground roadway floor according to claim 1, characterized in that the thickness of the filler surface layer is 20 mm to 30 mm. 4. The reinforced cell composite structure pavement of a hardened underground roadway floor according to claim 1, characterized in that the filling material and the filling surface layer are special dry hard concrete. 5. The reinforced cell composite structure road surface of a hardened underground roadway floor according to claim 1 or 2, characterized in that the reinforced cell is composed of at least 10 grids welded or riveted with each other by reinforcing bars.

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