CN110486018B - Lattice type composite shaft structure and construction method - Google Patents

Abstract

The invention provides a lattice type composite shaft structure and a construction method, which relate to the coal mining technology and comprise an outer shaft and an inner shaft, wherein the inner shaft is arranged in the outer shaft, and the outer wall of the inner shaft is connected with the inner wall of the outer shaft into a whole through concrete; outside pit shaft comprises two first section of thick bamboo walls and two second section of thick bamboo walls that encircle and mutual interval set up in proper order, first section of thick bamboo wall includes first steel-concrete layer and sets up the heated board at first steel-concrete layer outer wall, second section of thick bamboo wall includes second steel-concrete layer and sets up the heated board at second steel-concrete layer outer wall, first steel-concrete layer and second steel-concrete layer all include shaped steel skeleton and the concrete of pouring around shaped steel skeleton, the inside both ends on first steel-concrete layer inwards shrink and form a spacing groove, the inside both ends on second steel-concrete layer outwards extend form one with spacing groove complex stopper. The structure can improve the defects of the existing structure, effectively defend the damage caused by earthquake action, and enhance the shockproof and disaster reduction capability of the coal mine shaft in China.

Description

Lattice composite wellbore structure and construction method

technical field

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

Background technique

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

However, with the depletion of shallow coal resources, excavation to the deep and the construction of new mines in the deep surface layer will be an important problem to be solved urgently in coal mine construction. With the increase of topsoil thickness, there is a problem that the wellbore design is difficult to solve. Whether it is the design of the outer wellbore or the inner wellbore, when considering the frost heave pressure and the design of the total water pressure, the thickness of the wellbore will be too high. or the concrete strength grade is too high. At the same time, reinforced concrete is basically used as the shaft wall material for the support of shaft engineering at present. The construction generally binds the steel mesh, supports the formwork, and pours the concrete. There are problems that the amount of steel binding at the construction site is large, and the supporting formwork and pouring of the concrete are large. In addition, in the traditional shaft wall construction technology, the initial strength of the shaft wall after pouring is weak, and the strength does not meet the design requirements. Under the repeated action of the explosion load, cracks are prone to occur, which reduces the actual strength of the shaft wall and causes hidden dangers to the quality of the project.

Therefore, the present application provides a lattice-type composite wellbore structure and a construction method.

SUMMARY OF THE INVENTION

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

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

The lattice-type composite wellbore structure includes an outer wellbore and an inner wellbore, the number of the outer wellbore is multiple, the plurality of the outer wellbore are sequentially connected from top to bottom, and the outer wellbore is arranged in the excavated wellbore and The outer wall is in contact with the wellbore, the inner wellbore is arranged in the outer wellbore, and the outer wall and the inner wall of the outer wellbore are integrated by concrete;

The outer wellbore is composed of at least two first barrel walls and two second barrel walls, and the first barrel walls and the second barrel walls are arranged at intervals;

The first cylinder wall includes a first steel-mixed layer and a thermal insulation board arranged on the outer wall of the first steel-mixed layer, and the second cylinder wall includes a second steel-mixed layer and a thermal insulation board arranged on the outer wall of the second steel-mixed layer. The first steel-concrete layer and the second steel-concrete layer both include a profiled steel skeleton and concrete poured around the profiled steel skeleton, and two inner ends of the first steel-concrete layer shrink inward to form a limit groove, The inner two ends of the second steel-mixed layer extend outward to form a limit block that cooperates with the limit 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 support strength of the plurality of outer wellbores increases sequentially from top to bottom.

Preferably, the profiled steel skeleton comprises a plurality of arc-shaped steel lattice beams evenly arranged from top to bottom and a plurality of steel lattice columns vertically arranged on both sides of the steel lattice columns. The lattice columns and steel lattice beams are bound by steel bars.

Preferably, at least four steel lattice columns at the bottom of each outer wellbore extend outward to form plug-in ends, and the top of each outer wellbore is reserved with plug-in holes matched with the plug-in ends , the upper and lower adjacent two outer wellbores are connected through the plug end and the plug hole.

Preferably, at least 4 steel lattice columns at the top and bottom of each of the 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 provided with at least There are four mounting holes matched with the plug-in ends, one of the crown beams is arranged between the two adjacent outer wellbores up and down, and the two adjacent outer wellbores pass through the plug-in ends and the installation holes connected with the crown beam.

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

Preferably, the space between the steel lattice columns and the steel lattice beams of the lower outer wellbore are respectively smaller than the space between the steel lattice columns and the steel lattice of the upper outer wellbore. spacing between beams.

Preferably, the inner wellbore includes an inner-tube steel skeleton, and an inner layer of concrete is poured around the inner-tube steel skeleton.

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

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

Off-site prefabrication of the outer wellbore:

Step 1: Bind steel lattice columns and steel lattice beams to form a steel skeleton;

Step 2: Lay insulation boards and support formwork to form a pouring cavity;

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

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

Hoisting the outer wellbore at the construction site:

Step 5: Arrange the plurality of outer wellbores according to the diameters of the steel lattice columns and the steel lattice beams from large to small or according to the spacing between the steel lattice columns and the steel lattices of the outer wellbore The spacing between the structural beams is sequentially hoisted into the well hole of the excavation shaft from small to large; or one of the crown beams is hoisted between the upper and lower adjacent two outer wellbores;

The construction site pours the inner shaft:

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 skeleton in sections from bottom to top.

Preferably, a plurality of crown beams are also included, and in step 5, the plurality of outer shafts and crown beams are hoisted to the shaft in the mine hole at intervals in sequence.

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

(1) It includes an outer wellbore and an inner wellbore, the number of the outer wellbore is multiple, the multiple outer wellbores are connected in sequence from top to bottom, and the support strength of the multiple outer wellbores is sequentially enhanced from top to bottom, according to the depth of the mine. Supporting strength, solve the problem of too large shaft wall thickness or too high concrete strength grade, realize the idea of engineering optimization, and avoid the great waste caused by the same section and reinforcement of the traditional shaft from top to bottom;

(2) The support strength of multiple outer wellbores increases sequentially from top to bottom, and components with different mechanical properties are used for the expected damage and unexpected damage respectively, so as to realize the multi-channel seismic fortification and functional differentiation of the structure, and effectively prevent the seismic action zone. to enhance the earthquake-proof and disaster-reduction capability of coal mine shafts in my country;

(3) Carry out the steps of tying the profiled steel frame of the outer shaft, supporting the formwork, pouring concrete and other steps at the non-construction site, so as to solve the problem of the large amount of engineering work at the mine construction site, the large amount of supporting formwork and pouring concrete, and the construction strength is high and 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, reduces the actual strength of the shaft wall, and greatly reduces the hidden danger of engineering quality.

Description of drawings

Fig. 1 is the top view of the first cylinder wall;

Fig. 2 is the top view of the second cylinder wall;

Figure 3 is a top view of the outer wellbore;

Figure 4 is a plan development view of the profiled steel skeleton;

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

6 is a schematic diagram of a lattice-type composite wellbore structure in Example 1 of the present invention;

7 is a schematic structural diagram of an outer wellbore according to Embodiment 2 of the present invention;

Fig. 8 is the structural representation of the crown beam of Example 2 of the present invention;

FIG. 9 is a schematic diagram of the lattice-type composite wellbore structure in Example 2 of the present invention.

Detailed ways

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. The following examples are only used to illustrate 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, comprising an outer wellbore and an inner wellbore 1, the number of the outer wellbore is multiple, and the plurality of outer wellbore are connected in sequence from top to bottom, The outer wellbore is arranged in the excavated wellbore and the outer wall is in contact with the wellbore, the inner wellbore 1 is arranged in the outer wellbore and the outer wall and the inner wall of the outer wellbore are connected together by concrete; in this embodiment, the outer wellbore is not on the construction site. Prefabrication is carried out, and after prefabrication is completed, it is directly pulled to the construction site for hoisting, and the inner wellbore 1 is hoisted from the outer wellbore of the construction site and the construction is completed directly after the outer side is hoisted.

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 to Later hoisting.

As shown in FIG. 1 to FIG. 3 , in this embodiment, both the first cylinder wall 3 and the two second cylinder walls 4 are two, and the first cylinder wall 3 includes a first steel mix layer and a The insulation board 5 on the outer wall of the layer, the second cylinder wall 4 includes the second steel mixed layer and the insulation board 5 arranged on the outer wall of the second steel mixed layer. For the concrete 6 around the steel frame, the inner two ends of the first steel-concrete layer shrink inward to form a limit groove 7, and the inner two ends of the second steel-concrete layer extend outward to form a limit block that cooperates with the limit groove 7 8. The two first cylinder walls 3 and the two second cylinder walls 4 are arranged in sequence and spaced apart from each other, and the limit block 8 is clamped with the limit groove 7; the support strength of the multiple outer wellbore increases sequentially from top to bottom. By arranging the limit grooves 7 and the limit blocks 8 that are snapped together, the two adjacent first cylinder walls 3 and the second cylinder walls 4 are mutually restricted and not easy to move, and the installation strength is increased on the premise of ensuring the installation safety. Efficiency; at the same time, the support strength of multiple outer shafts increases sequentially from top to bottom, and the support strength of the shaft is set according to the depth of the mine to solve the problem of too large shaft wall thickness or too high concrete strength grade, and realize the idea of engineering optimization, avoiding the The traditional wellbore's section and reinforcement are exactly the same from top to bottom, which is a huge waste.

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

In order to improve stability, as shown in FIG. 5 , in this embodiment, at least four steel lattice columns 12 at the bottom of each outer wellbore extend outward to form plug ends 14 , and the top of each outer wellbore is reserved for In the insertion hole 15 matched with the insertion end 14 , the two outer wellbore adjacent up and down are connected by the insertion end 14 and the insertion hole 15 .

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 completely 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 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 wellbore, respectively. As the ground pressure decreases, the steel lattice column 12 and the steel lattice beam 11 Degenerates into a reinforced keel.

Or solve the problem of great waste caused by the fact that the cross-section and reinforcement of the traditional wellbore are completely 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 wellbore The spacing between 11 is smaller than the spacing between the steel lattice columns 12 and the steel lattice beams 11 of the upper outer wellbore respectively, that is, changing the steel lattice columns 12 and 11 from bottom to top. The installation density of steel lattice beams 11. Through the difference in the cross section or spacing between the steel lattice columns 12 and the steel lattice beams 11, the idea of engineering optimization is realized, the strength of the wellbore is improved, materials are saved, and components with different mechanical properties are used for the expected damage parts and unexpected parts respectively. The damaged parts can realize multi-channel seismic fortification and functional differentiation of the structure, effectively prevent the damage caused by earthquake action, and enhance the earthquake-proof and disaster-reducing ability of coal mine shafts in my country.

In this embodiment, the inner wellbore 1 includes an inner-cylinder steel skeleton, and the inner-layer concrete is poured around the inner-cylinder steel skeleton. The inner tube steel skeleton 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 skeleton and pouring concrete on site.

In order to improve the performance of the wellbore structure, in this embodiment, 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 . In this embodiment, one-step molding of heat preservation and waterproofing improves the service life of the wellbore and effectively solves the problem of wellbore leakage. The surface of the waterproof roll layer 9 is coated with smooth graphite material to reduce the settlement and deformation of the wellbore in the later stage.

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

The present embodiment also provides a construction method for the lattice-type composite wellbore structure, which specifically includes the following steps:

Off-site prefabricated outer wellbore:

Step 1: Bind the steel lattice columns 12 and the steel lattice beams 11 to form a steel skeleton;

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

Step 3: Put the profiled steel skeleton into the pouring cavity and pour concrete 6;

Step 4: A waterproof roll layer 9 is arranged on the outer layer of the thermal insulation board 5, and a graphite material 10 is applied on the outer layer of the waterproof roll layer 9;

Hoisting the outer wellbore at the construction site:

Step 5: Arrange the multiple outer wellbores according to the diameters of the steel lattice columns 12 and the steel lattice beams 11 from large to small or according to the spacing between the steel lattice columns 12 and the steel lattice beams 11 of the outer wellbore The spacing between them is hoisted in order from small to large into the well hole of the mining well;

Pouring the inner wellbore 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 skeleton from bottom to top.

Example 2

As shown in FIG. 7 to FIG. 9 , in order to reduce the difficulty of hoisting, in this embodiment, at least four steel lattice columns 12 at the top and bottom of each outer wellbore extend outward to form plug ends 14 , and also include multiple Each crown beam 16, the top surface and the bottom surface of the crown beam 16 are provided with at least four mounting holes 17 matched with the plug end 14, and a crown beam 16 is arranged between the two outer wellbore adjacent to the upper and lower sides. The outer wellbore is connected to the crown beam 16 through the plug-in end 14 and the installation hole 17 , and the rest of the structure is the same as that of Embodiment 1, and will not be repeated here. The height of the crown beam 16 is lower than the height of the outer wellbore. During the hoisting process, the plug end 14 and the installation hole 17 are easier to quickly and accurately locate and plug each other, which improves the hoisting efficiency. At the same time, the crown beam 16 plays a transitional role, which further improves the support Protection strength and stability. On the construction site, a plurality of outer wellbores and the crown beams 16 are hoisted at intervals as required, as shown in FIG. 9 , which is a schematic structural diagram of the two outer wellbores after installation.

The construction method of the above-mentioned lattice type composite wellbore structure, the concrete steps are as follows:

Off-site prefabricated outer wellbore:

Step 1: Bind the steel lattice columns 12 and the steel lattice beams 11 to form a steel skeleton;

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

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

Step 4: A waterproof roll layer 9 is arranged on the outer layer of the thermal insulation board 5, and a graphite material 10 is applied on the outer layer of the waterproof roll layer 9;

Hoisting the outer wellbore at the construction site:

Step 5: Arrange the multiple outer shafts and crown beams 16 according to the diameters of the steel lattice columns 12 and the steel lattice beams 11 from large to small or according to the spacing and steel shapes between the steel lattice columns 12 of the outer wellbore The spacing between the lattice beams 11 is hoisted into the well hole of the excavation shaft at intervals from small to large.

Pouring the inner shaft at the construction site:

Step 6: Bind the inner cylinder steel bars;

Step 7: Support formwork and pour concrete.

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

The above-mentioned embodiments are only preferred specific embodiments 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 the simplicity of the technical solution within the technical scope disclosed in the present invention. Changes or equivalent replacements all belong to the protection scope of the present invention.

Claims (9)

1. A lattice-type composite wellbore structure, characterized in that it comprises an outer wellbore and an inner wellbore (1), the number of the outer wellbore is multiple, and a plurality of the outer wellbores are sequentially connected from top to bottom, and the The outer wellbore is arranged in the excavated wellbore and the outer wall is in contact with the wellbore, the inner wellbore (1) is arranged in the outer wellbore and the outer wall and the inner wall of the outer wellbore are integrated by concrete; The outer wellbore is composed of at least two first cylindrical walls (3) and two second cylindrical walls (4), and the first cylindrical walls (3) and the second cylindrical walls (4) are arranged at intervals; The first cylinder wall (3) includes a first steel-mixed layer and a thermal insulation board (5) arranged on the outer wall of the first steel-mixed layer, and the second cylinder wall (4) includes a second steel-mixed layer and is arranged on the outer wall of the first steel-mixed layer. 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 comprise a profiled steel skeleton and concrete (6) poured around the profiled steel skeleton, the first steel The inner two ends of the mixed layer shrink inward to form a limit groove (7), and the inner two ends of the second steel mixed layer extend outward to form a limit block (8) matched with the limit groove (7). ), the two first cylinder walls (3) and the two second cylinder walls (4) are arranged in turn and spaced apart from each other, and the limit block (8) is clamped with the limit groove (7); The support strength of the plurality of outer wellbores increases sequentially from top to bottom. 2. The lattice-type composite wellbore structure according to claim 1, wherein the profiled steel skeleton comprises a plurality of arc-shaped steel lattice beams (11) uniformly arranged from top to bottom and vertically arranged in the A plurality of steel lattice columns (12) are provided on both sides of the steel lattice beam (11), and the steel lattice columns (12) and the steel lattice beam (11) are bound by steel bars (13). 3. The lattice-type composite wellbore structure according to claim 2, characterized in that, at least 4 steel lattice columns (12) at the bottom of each of the outer wellbore extend outward to form plug ends (14) , the top of each outer wellbore is reserved with an insertion hole (15) matched with the insertion end (14), and the two outer wellbore adjacent up and down pass through the insertion end (14) and the insertion The connection hole (15) is connected. 4. The lattice-type composite wellbore structure according to claim 3, characterized in that, at least 4 steel lattice columns (12) on the top and bottom of each of the outer wellbore extend outward to form plug-in ends ( 14), also comprising a plurality of crown beams (16), the top and bottom surfaces of the crown beams (16) are provided with at least four mounting holes (17) that are matched with the plug-in ends (14), and the upper and lower sides are in phase with each other. A crown beam (16) is arranged between two adjacent outer wellbores, and the upper and lower adjacent outer wellbores are connected to the crown beam (16) through the insertion end (14) and the installation hole (17). 16) Connect. 5. The lattice-type composite wellbore structure according to claim 4, wherein the cross-section of the steel-type lattice column (12) and the cross-section of the steel-type lattice beam (11) of the lower outer wellbore are respectively It is larger than the cross section of the steel lattice column (12) and the cross section of the steel lattice beam (11) of the outer wellbore. 6. The lattice-type composite wellbore structure according to claim 4, wherein the distance between the steel lattice columns (12) of the lower outer wellbore and the distance between the steel lattice beams (11) The spacing is respectively smaller than the spacing between the steel lattice columns (12) and the steel lattice beams (11) of the outer wellbore above. 7 . The lattice-type composite wellbore structure according to claim 4 , wherein the inner wellbore ( 1 ) comprises an inner-tube steel skeleton, and an inner layer of concrete is poured around the inner-tube steel skeleton. 8 . 8 . The lattice-type composite wellbore structure according to claim 4 , wherein 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 graphite. 9 . material (10). 9. a construction method of lattice type composite wellbore structure according to any one of claim 1 to 8, is characterized in that, comprises the following steps: Off-site prefabrication of the outer wellbore: Step 1: binding the steel lattice columns (12) and the steel lattice beams (11) to form a steel skeleton; Step 2: Lay the insulation board (5) and support the formwork to form a pouring cavity; Step 3: Put the profiled steel skeleton into the pouring cavity and pour concrete (6); Step 4: disposing a waterproof roll layer (9) on the outer layer of the thermal insulation board (5), and smearing a graphite material (10) on the outer layer of the waterproof roll layer (9); Hoisting the outer wellbore at the construction site: Step 5: Arrange the plurality of outer wellbores according to the diameters of the steel lattice columns (12) and steel lattice beams (11) from large to small or according to the steel lattice columns (12) of the outer wellbore ) and the spacing between the steel lattice beams (11) are hoisted in order from small to large into the well hole of the mining well; or one of the crowns is hoisted between the upper and lower adjacent two outer wellbores 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 skeleton in sections from bottom to top.

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