WO2021026971A1

WO2021026971A1 - Lattice composite wellbore structure and construction method therefor

Info

Publication number: WO2021026971A1
Application number: PCT/CN2019/103527
Authority: WO
Inventors: 张程华
Original assignee: 西安科技大学
Priority date: 2019-08-14
Filing date: 2019-08-30
Publication date: 2021-02-18
Also published as: CN110486018B; CN110486018A

Abstract

A lattice composite wellbore structure and a construction method therefor. The lattice composite wellbore structure comprises outer wellbores and an inner wellbore (1) provided therein. An outer wall of the inner wellbore (1) is connected to an inner wall of the outer wellbore by means of concrete. The outer wellbore consists of two first cylinder walls (3) and two second cylinder walls (4) sequentially surrounding and provided at intervals. The first cylinder wall (3) comprises a first steel mixed layer and a thermal insulation plate (5) provided on an outer wall of the first steel mixed layer. The second cylinder wall (4) comprises a second steel mixed layer and a thermal insulation plate (5) provided on an outer wall of the second steel mixed layer. Both the first steel mixed layer and the second steel mixed layer comprise a profiled steel skeleton and concrete (6) poured around the profiled steel skeleton. Two inner ends of the first steel mixed layer shrink inward to form a limit groove (7). Two inner ends of the second steel mixed layer extend outward to form a limit block (8) matching the limit groove (7).

Description

Lattice composite shaft structure and construction method

Technical field

The invention relates to coal mining technology, in particular to a lattice type composite shaft structure and method.

Background technique

With the rapid development of my country's economic construction, energy demand is increasing, and the problem of energy shortages is becoming more and more serious. It will take time for new energy to fully replace traditional energy. From the perspective of my country's current energy composition, coal energy still occupies a major position. Therefore, building a batch of large coal mines is an urgent task at present.

However, with the depletion of coal resources in the shallow part, digging into the deep part and building new mines in the deep surface soil will be an important issue that needs to be solved urgently in coal mine construction. As the thickness of the surface soil increases, there are problems that are difficult to solve in the shaft wall design. Whether it is the design of the outer shaft wall or the inner shaft wall, the shaft wall thickness will be too large when considering the frost heave pressure and the full water pressure design. Or the concrete strength level is too high. At the same time, the current shaft engineering support basically uses reinforced concrete as the shaft wall material, and the construction generally binds the steel mesh, supports the formwork, and pours the concrete. There are problems with the large amount of reinforcement work on the construction site and the large amount of supporting formwork and pouring concrete. In addition, with traditional shaft wall construction technology, the initial strength of the shaft wall is weak after pouring, and the strength cannot meet the design requirements. Under repeated explosive loads, cracks are likely to occur, which reduces the actual strength of the shaft wall and causes hidden dangers to engineering quality.

Therefore, this application provides a lattice composite wellbore structure and method

Summary of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a lattice composite wellbore structure.

In order to achieve the above objectives, the present invention provides the following technical solutions:

The lattice composite wellbore structure includes an outer wellbore and an inner wellbore. The number of the outer wellbores is multiple. A plurality of the outer wellbores are sequentially connected from top to bottom. The outer wellbores are arranged in the excavated wellbore. The outer wall is in contact with the well bore, the inner shaft is arranged in the outer shaft, and the outer wall and the inner wall of the outer shaft are connected as a whole through concrete;

The outer wellbore is composed of at least two first cylinder walls and two second cylinder walls, and the first cylinder walls and the second cylinder walls are spaced apart;

The first cylinder wall includes a first steel-concrete layer and an insulating board arranged on the outer wall of the first steel-concrete layer, and the second cylinder wall includes a second steel-concrete layer and an insulating board arranged on the outer wall of the second steel-concrete layer. The first steel-concrete layer and the second steel-concrete layer both include a profiled steel frame and concrete poured around the profiled steel frame. The inner ends of the first steel-concrete layer shrink inward to form a limiting groove, The inner ends of the second steel-concrete layer extend outward to form a limiting block that cooperates with the limiting groove, and the two first cylinder walls and the two second cylinder walls are sequentially surrounded and spaced apart from each other. The limit block is clamped with the limit slot;

The supporting strength of the plurality of outer wellbores is increased from top to bottom.

Preferably, the section steel framework includes a plurality of arc-shaped steel lattice beams uniformly arranged from top to bottom and a plurality of steel lattice columns arranged vertically on both sides of the steel lattice column. The lattice column and the steel lattice beam are bound by steel bars.

Preferably, at least 4 steel lattice columns at the bottom of each outer wellbore extend outward to form a plug-in end, and the top of each outer wellbore is reserved with plug-in holes that cooperate with the plug-in end , The two adjacent outer wellbores up and down are connected through the plug-in end and the plug-in hole.

Preferably, at least 4 steel lattice columns at the top and bottom of each outer wellbore extend outward to form plug-in ends, and further include a plurality of crown beams, and the top and bottom surfaces of the crown beams are both provided with at least Four mounting holes matched with the plug-in end, a crown beam is arranged between two adjacent outer wellbores up and down, and two adjacent outer wellbores pass through the plug-in end and the installation hole Connect with the crown beam.

Preferably, the cross section of the steel lattice column and the cross section of the steel lattice beam of the lower outer wellbore are respectively larger than the cross section of the steel lattice column and the cross section of the steel lattice beam of the upper outer shaft. section.

Preferably, the spacing between the steel lattice columns and the spacing between the steel lattice beams of the lower outer wellbore is smaller than the distance between the steel lattice columns and the steel lattice of the outer shaft above. The spacing between the beams.

Preferably, the inner wellbore includes an inner cylinder steel frame, and inner concrete is poured around the inner cylinder steel frame.

Preferably, the outer wall of the insulation board is provided with a waterproof roll layer, and the outside of the waterproof roll layer is coated with a graphite material.

Another object of the present invention is to provide a lattice composite wellbore construction method, including the following steps:

Non-construction site prefabrication of the outer shaft:

Step 1: Bind the steel lattice column and the steel lattice beam to form a steel frame;

Step 2: Lay the insulation board and support the template to form a pouring cavity;

Step 3: Put the steel frame into the pouring cavity and pour the concrete;

Step 4: Set a waterproof roll layer on the outer layer of the insulation board, and apply graphite material on the outer layer of the waterproof roll layer;

Hoisting the outer shaft at the construction site:

Step 5: Adjust the plurality of outer shafts according to the diameters of the steel lattice column and the steel lattice beam from large to small, or according to the spacing between the steel lattice columns and the steel lattice of the outer shaft The spacing between the beams is hoisted in order from small to large to the shaft of the excavation mine; or one of the crown beams is hoisted between two adjacent outer shafts;

Pouring the inner shaft at the construction site:

Step 6: Bind the inner tube steel bars to form the inner tube steel bar skeleton;

Step 7: Support the formwork and pour concrete into the inner cylinder steel frame from bottom to top.

Preferably, a plurality of crown beams are further included, and in step 5, the plurality of outer shafts and crown beams are sequentially hoisted to the shaft of the mine tunnel at intervals.

The lattice composite wellbore structure and method provided by the present invention have the following beneficial effects:

(1) Including the outer shaft and inner shaft, the number of outer shafts is multiple, and the multiple outer shafts are connected sequentially from top to bottom, and the support strength of multiple outer shafts is increased from top to bottom. Support strength, solve the problem of too much shaft wall thickness or too high concrete strength grade, realize the idea of engineering optimization, and avoid the huge waste caused by the fact that the cross-section and reinforcement of the traditional shaft are exactly the same from top to bottom;

(2) The support strength of multiple outer wellbores is increased sequentially from top to bottom, and components with different mechanical properties are used for the expected damage site and the unexpected damage site respectively to realize the multi-channel seismic fortification and functional differentiation of the structure, and effectively defend the seismic zone The damage caused by the coming damage will enhance the ability of my country’s coal mine shafts to prevent earthquakes and reduce disasters;

(3) Carry out the steps of binding, formwork, and concrete pouring of the outer shaft on the non-construction site to solve the problem of large engineering volume at the mine construction site, large supporting template, and large volume of concrete pouring. The building has high strength and is easy to control. It solves the problem that the traditional shaft wall construction technology is prone to cracks under the repeated action of explosive loads, which reduces the actual strength of the shaft wall, and greatly reduces the hidden dangers of engineering quality.

Description of the drawings

Figure 1 is a top view of the first cylinder wall;

Figure 2 is a top view of the second cylinder wall;

Figure 3 is a top view of the outer wellbore;

Figure 4 is a plan view of the profile steel skeleton;

5 is a schematic diagram of the structure of the outer wellbore of Embodiment 1 of the present invention;

Fig. 6 is a schematic diagram of a lattice composite wellbore structure of embodiment 1 of the present invention;

Fig. 7 is a schematic diagram of the structure of the outer wellbore of embodiment 2 of the present invention;

FIG. 8 is a schematic diagram of the structure of the crown beam of Embodiment 2 of the present invention;

Fig. 9 is a schematic diagram of a lattice composite wellbore structure of embodiment 2 of the present invention.

detailed description

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to explain the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

Example 1

The present invention provides a lattice type composite wellbore structure, as shown in Fig. 1 to Fig. 6 specifically, including an outer wellbore and an inner wellbore 1. The number of the outer wellbores is multiple, and the multiple outer wellbores are connected sequentially from top to bottom. The outer shaft is set in the excavated shaft and the outer wall is in contact with the shaft. The inner shaft 1 is set in the outer shaft and the outer wall and the inner wall of the outer shaft are connected as a whole through concrete; in this embodiment, the outer shaft is in a non-construction site Carry out prefabrication. After prefabrication, it is directly pulled to the construction site for hoisting. The inner shaft 1 is directly completed after hoisting the outer side of the outer shaft of the construction site.

Specifically, the outer wellbore is composed of at least two first barrel walls 3 and two second barrel walls 4, and the first barrel walls 3 and the second barrel walls 4 are arranged at intervals; by dividing the outer wellbore into four parts, it is convenient The later hoisting.

As shown in Figures 1 to 3, in this embodiment, both the first cylinder wall 3 and the two second cylinder walls 4 are two. The first cylinder wall 3 includes a first steel concrete layer and a first steel concrete layer. The second cylinder wall 4 includes a second steel concrete layer and an insulation plate 5 arranged on the outer wall of the second steel concrete layer. Both the first steel concrete layer and the second steel concrete layer include a profile steel frame and cast in For the concrete 6 around the profiled steel frame, the inner ends of the first steel concrete layer shrink inward to form a limiting groove 7, and the inner ends of the second steel concrete layer extend outward to form a limiting block that matches the limiting groove 7 8. The two first cylinder walls 3 and the two second cylinder walls 4 are arranged in turn around and spaced apart from each other, and the limit block 8 is clamped with the limit slot 7; the support strength of multiple outer wellbores is increased from top to bottom. By setting the limit groove 7 and the limit block 8 that are clamped to each other, the two adjacent first cylinder walls 3 and the second cylinder wall 4 are mutually restricted and not easy to move, and the installation is ensured under the premise of increasing the installation strength. Efficiency; at the same time, the support strength of multiple outer shafts is increased from top to bottom. The support strength of the shaft is set according to the depth of the mine to solve the problem of too much shaft wall thickness or too high concrete strength level, and realize the idea of engineering optimization and avoid The cross-section and reinforcement of traditional wellbore are exactly the same from top to bottom, which is a huge waste.

Further, as shown in FIG. 4, in this embodiment, the section steel framework includes a plurality of arc-shaped steel lattice beams 11 uniformly arranged from top to bottom and a plurality of vertically arranged on both sides of the steel lattice column 12 The steel lattice column 12, the steel lattice column 12 and the steel lattice beam 11 are bound by steel bars 13.

In order to improve stability, as shown in Figure 5, in this embodiment, at least four steel lattice columns 12 at the bottom of each outer wellbore extend outward to form a plug-in end 14, and the top of each outer wellbore is reserved The plug-in hole 15 matched with the plug-in end 14 is connected by the plug-in end 14 and the plug-in hole 15 through two adjacent outer wellbores.

Specifically, in order to avoid the problem of great waste caused by the fact that the cross-section and reinforcement of the traditional wellbore are exactly the same from top to bottom, in this embodiment, the cross section of the steel lattice column 12 of the lower outer wellbore and the steel lattice The cross section of the beam 11 is respectively larger than the cross section of the steel lattice column 12 and the cross section of the steel lattice beam 11 of the upper outer shaft. As the ground pressure decreases, the steel lattice column 12 and the steel lattice beam 11 Degenerate into a reinforced keel.

Or another way to solve the problem of great waste caused by the fact that the cross-section and reinforcement of the traditional wellbore are exactly the same from top to bottom, that is, the spacing between the steel lattice columns 12 and the steel lattice beams of the lower outer shaft The spacing between 11 is smaller than the spacing between the steel lattice column 12 of the upper outer shaft and the spacing between the steel lattice beam 11, that is, the steel lattice column 12 and the steel lattice beam 11 are changed from bottom to top. The installation density of the steel lattice beam 11. Through the difference in the cross section or spacing of the steel lattice column 12 and the steel lattice beam 11, the idea of engineering optimization is realized, the strength of the wellbore is improved, the material is saved, and the components with different mechanical properties are used for the expected damage location and the unexpected Damaged parts, to achieve multi-channel seismic fortification and functional differentiation of the structure, effectively defend against damage caused by earthquakes, and enhance the ability of my country's coal mine shafts to prevent earthquakes and reduce disasters.

In this embodiment, the inner wellbore 1 includes an inner cylinder steel frame, and inner concrete is poured around the inner cylinder steel frame. The inner tube steel frame here is a common steel keel, and the inner shaft 1 has a lower strength requirement, which is completed by tying the inner tube steel frame on site and pouring concrete.

In order to improve the performance of the wellbore structure, in this embodiment, the outer wall of the insulation board 5 is provided with a waterproof roll layer 9, and the waterproof roll layer 9 is coated with a graphite material 10. In this embodiment, heat preservation and waterproofing are formed at one time to increase the service life of the wellbore and effectively solve the problem of leakage of the wellbore. The outer surface of the waterproof roll layer 9 is coated with smooth graphite materials to reduce the later settlement deformation of the wellbore.

At the construction site, multiple outer wellbores are hoisted as needed, as shown in Figure 6, which is a schematic diagram of the structure of the two outer wellbores after installation.

This embodiment also provides a construction method for the lattice composite wellbore structure, which specifically includes the following steps:

Non-construction site prefabricated outer shaft:

Step 1: Bind the steel lattice column 12 and the steel lattice beam 11 to form a steel frame;

Step 2: Lay the insulation board 5 and support the template to form a pouring cavity;

Step 3: Put the steel frame into the pouring cavity, and pour the concrete 6;

Step 4: Set a waterproof roll layer 9 on the outer layer of the insulation board 5, and apply graphite material 10 on the outer layer of the waterproof roll layer 9;

Hoisting the outer shaft at the construction site:

Step 5: Align the multiple outer wellbores according to the diameter of the steel lattice column 12 and the steel lattice beam 11 from large to small, or according to the spacing between the steel lattice column 12 and the steel lattice beam 11 of the outer shaft The spacing between the two is hoisted in order from small to large to the shaft of the excavation mine;

Pouring the inner shaft 1 at the construction site:

Step 7: Support the formwork and pour concrete 6 into the inner cylinder steel frame from bottom to top.

Example 2

As shown in Figures 7-9, in order to reduce the difficulty of hoisting, in this embodiment, at least four steel lattice columns 12 on the top and bottom of each outer wellbore extend outward to form a plug-in end 14, which also includes multiple A crown beam 16 is provided on the top surface and the bottom surface of the crown beam 16 with at least four mounting holes 17 that cooperate with the plug-in end 14. A crown beam 16 is provided between two adjacent outer shafts. The outer wellbore is connected to the crown beam 16 through the plug-in end 14 and the mounting hole 17. The rest of the structure is the same as that of the first embodiment, which will not be repeated here. The height of the crown beam 16 is lower than the height of the outer shaft. During the hoisting process, the plug-in end 14 and the mounting hole 17 are easier to quickly and accurately locate and connect to each other, which improves the efficiency of hoisting. At the same time, the crown beam 16 plays a transitional role and further improves the support. Protect strength and stability. At the construction site, multiple outer wellbores and crown beams 16 are hoisted at intervals as needed, as shown in Fig. 9, which is a schematic diagram of the structure of the two outer wellbores after installation.

The specific steps of the construction method of the above lattice composite wellbore structure are as follows:

Non-construction site prefabricated outer shaft:

Step 3: Put the steel frame into the pouring cavity and pour the concrete;

Hoisting the outer shaft at the construction site:

Step 5: Align the multiple outer shafts and crown beams 16 according to the diameters of the steel lattice column 12 and the steel lattice beam 11 from large to small, or according to the spacing and steel type between the steel lattice columns 12 of the outer shaft The spacing between the lattice beams 11 is hoisted into the pit of the excavation mine at intervals from small to large.

Pouring the inner shaft at the construction site:

Step 6: Binding the inner cylinder steel bars;

Step 7: Support the formwork and pour concrete.

It should be noted that, in this embodiment, the pouring of the inner wellbore is segmented pouring from bottom to top.

The above-mentioned embodiments are only preferred specific implementations of the present invention, and the protection scope of the present invention is not limited thereto. Any person skilled in the art can obviously obtain a simple technical solution within the technical scope disclosed by the present invention. Changes or equivalent replacements fall within the protection scope of the present invention.

Claims

A lattice composite wellbore structure, which is characterized in that it comprises an outer wellbore and an inner wellbore (1), the number of the outer wellbores is multiple, and the multiple outer wellbores are sequentially connected from top to bottom. The inner shaft (1) is arranged in the excavated shaft and the outer wall abuts against the shaft, and the inner shaft (1) is provided in the outer shaft and the outer wall and the inner wall of the outer shaft are connected as a whole through concrete;

The outer wellbore is composed of at least two first cylinder walls (3) and at least two second cylinder walls (4), and the first cylinder walls (3) and the second cylinder walls (4) are arranged at intervals;

The first cylinder wall (3) includes a first steel-concrete layer and an insulation board (5) arranged on the outer wall of the first steel-concrete layer, and the second cylinder wall (4) includes a second steel-concrete layer and is arranged at the The thermal insulation board (5) of the outer wall of the second steel-concrete layer, the first steel-concrete layer and the second steel-concrete layer both include a section steel framework and concrete (6) poured around the section steel framework, the first steel The inner ends of the mixed layer shrink inward to form a limiting groove (7), and the inner ends of the second steel mixed layer extend outward to form a limiting block (8) that matches with the limiting groove (7). ), the two first cylinder walls (3) and the two second cylinder walls (4) are arranged around and spaced apart from each other in sequence, and the limit block (8) is clamped with the limit slot (7);

The supporting strength of the plurality of outer wellbores is increased from top to bottom.
The lattice composite wellbore structure according to claim 1, characterized in that the section steel framework includes a plurality of arc-shaped steel lattice beams (11) evenly arranged from top to bottom and vertically arranged on the steel A plurality of steel lattice columns (12) on both sides of the lattice column (11), the steel lattice columns (12) and the steel lattice beams (11) are bound by steel bars (13).
The lattice composite wellbore structure according to claim 2, wherein at least 4 steel lattice columns (12) at the bottom of each outer wellbore extend outward to form plug-in ends (14), each A plug hole (15) is reserved on the top of each of the outer wellbores to match the plug end (14), and two adjacent outer wellbores pass through the plug end (14) and the plug hole. (15) Connection.
The lattice composite wellbore structure according to claim 2, wherein at least four steel lattice columns (12) on the top and bottom of each outer wellbore extend outward to form plug-in ends (14) , It also includes a plurality of crown beams (16), the top and bottom surfaces of the crown beams (16) are both provided with at least four mounting holes (17) that are matched with the plug-in ends (14), two adjacent A crown beam (16) is arranged between the outer shafts, and two adjacent outer shafts are connected to the crown beam (16) through the plug-in end (14) and the mounting hole (17). connection.
The lattice composite wellbore structure according to claim 3 or 4, wherein the cross section of the steel lattice column (12) of the outer wellbore located at the lower part and the cross section of the steel lattice beam (11) The cross-sections are respectively larger than the cross-section of the steel lattice column (12) and the cross-section of the steel lattice beam (11) of the outer shaft at the upper part.
The lattice composite wellbore structure according to claim 3 or 4, wherein the distance between the steel lattice column (12) of the outer wellbore located at the lower part and the steel lattice beam (11) The distance between the two is smaller than the distance between the steel lattice column (12) and the distance between the steel lattice beams (11) of the outer shaft at the upper part.
The lattice composite wellbore structure according to claim 1, wherein the inner wellbore (1) comprises an inner cylinder steel frame, and inner concrete is poured around the inner cylinder steel frame.
The lattice composite wellbore structure according to claim 1, characterized in that the outer wall of the thermal insulation board (5) is provided with a waterproof roll layer (9), and the waterproof roll layer (9) is coated with a graphite material ( 10).
A construction method of a lattice composite wellbore structure according to any one of claims 1 to 8, characterized in that it comprises the following steps:

Non-construction site prefabrication of the outer shaft:

Step 1: Bind the steel lattice column (12) and the steel lattice beam (11) to form a steel frame;

Step 2: Lay the insulation board (5) and support the template to form a pouring cavity;

Step 3: Put the steel frame into the pouring cavity, and pour the concrete (6);

Step 4: Set a waterproof roll layer (9) on the outer layer of the insulation board (5), and apply graphite material (10) on the outer layer of the waterproof roll layer (9);

Hoisting the outer shaft at the construction site:

Step 5: Arrange a plurality of the outer wellbore according to the diameter of the steel lattice column (12) and the steel lattice beam (11) from large to small or according to the steel lattice column (12) of the outer shaft ) And the distance between the steel lattice beams (11) are hoisted from small to large to the shaft of the excavation shaft; or one of the above-mentioned outer shafts is hoisted between two adjacent outer shafts. Crown beam (16);

Pouring the inner shaft (1) at the construction site:

Step 6: Bind the inner tube steel bars to form the inner tube steel bar skeleton;

Step 7: Support the formwork and pour concrete (6) into the inner cylinder steel frame from bottom to top.