A construction method for foundation structure of a gently sloped inclined well reverse drilling rig

Abstract

A construction method for the foundation structure of a reverse well drilling rig on a gentle slope, belongs to the technical field of foundation structure design and construction of reverse well drilling rigs during water conservancy and hydropower construction. It includes a concrete foundation and a drill rod storage rack. The concrete foundation is arranged on the bottom plate of the tunnel. The concrete foundation is set as an inclined surface facing the installation direction of the drilling rig. Pre-buried steel pipes are set along the center line of the inclined well drilling hole in the concrete foundation. Pre-buried H-steels are set on the inclined surface of the concrete foundation. A drill rod storage rack is set on one side of the concrete foundation. The beneficial effects of the present invention are: through technical over-excavation, a concrete foundation is set, and pre-buried H-steels are matched to form foundation stress conditions. Pre-buried steel pipes are used in the foundation concrete to avoid damage to the concrete foundation caused by drilling rigs. The stress condition of the reverse well drilling rig is better, and the drilling accuracy is better controlled. It is suitable for the construction of reverse well drilling rigs on gentle slopes.

Description

Technical Field

[0001] The invention belongs to the technical field of foundation structure design and construction of a raise boring machine during inclined shaft construction in water conservancy and hydropower, railway, highway and coal mine engineering, and is particularly suitable for the construction foundation structure of an inclined shaft raise boring machine with an angle less than 45 degrees and greater than 36 degrees. Background Art

[0002] Conventional raise drilling rig construction is generally suitable for inclined shafts or vertical shafts with an inclination angle of 60° to 90°. There are also records of using raise drilling rigs to construct 45° inclined shafts at home and abroad. When using raise drilling rigs for inclined shafts and vertical shafts, a drilling rig foundation must be constructed before construction. On the one hand, it is convenient for the installation and reinforcement of the drilling rig, and on the other hand, it can also improve the stress conditions of the drilling rig during the reverse expansion and well guidance, and it is conducive to the arrangement of corresponding supporting facilities for the construction of the raise drilling rig (mud pool, clear water pool, etc.). The foundation of the raise drilling rig usually adopts a plain concrete structure. Due to the large inclination angle (greater than 45°) of the conventional concrete foundation, local modifications can be made to the raise drilling rig boom and foundation at the same time to meet the drilling needs of the corresponding angle, which has little effect on the stress of the drilling rig. However, for inclined shafts that are gentler than this angle, the drilling rig is subjected to complex forces, and the force component in the direction of gravity is greater. The drilling rig is prone to mechanical failure under the action. It is necessary to make the drilling rig force perpendicular to the foundation surface as much as possible to improve the stress condition. Summary of the invention

[0003] The problem to be solved by the present invention is to provide a foundation structure suitable for the construction of a reverse well drilling rig in a gently sloped inclined well in view of the above shortcomings. The technical solution is as follows:

[0004] It includes a concrete foundation and a drill rod storage rack. The concrete foundation is arranged on the tunnel bottom plate. The concrete foundation is set as an inclined surface facing the installation direction of the drilling rig. Embedded steel pipes are set along the center line of the inclined well drilling hole in the concrete foundation. Embedded H-steels are set on the inclined surface of the concrete foundation. A drill rod storage rack is set on one side of the concrete foundation.

[0005] The concrete foundation slope is perpendicular to the axis of the inclined shaft.

[0006] The bottom of the concrete foundation is buried below the tunnel floor to a depth of not less than 700mm, the top width is not less than 3000mm, the bottom width is not more than 4000mm, and the height is not less than 2350mm.

[0007] The drill rod storage rack is a rectangular structure with a length of not less than 4000 mm, a width of not less than 1200 mm, and a thickness of not less than 700 mm.

[0008] The embedded H-steels are arranged along the entire length of the inclined surface, with a spacing consistent with the spacing of the anchor bolts of the raise boring machine, and are embedded in the concrete by no less than 50 mm.

[0009] The upper end of the embedded steel pipe is flush with the inclined surface of the concrete foundation.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The present invention uses technical over-excavation to set a concrete foundation, and uses pre-buried H-steel to form foundation stress conditions. It uses pre-buried steel pipes in the foundation concrete to avoid damage to the concrete foundation caused by drilling by the drill rig. The stress condition of the raise drilling rig is better, and the drilling accuracy is better controlled. It is suitable for the construction of raise drilling rigs in gently sloped inclined wells (inclination angle 36°~45°).

[0012] 2. A drill rod storage rack is set up for storing drill rods, which improves the adaptability of the gently sloped inclined well raise drilling rig, improves the stress conditions of the foundation, and ensures the stability of the raise drilling rig. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 , is a schematic diagram of the side structure of the present invention;

[0014] Figure 2 ,yes Figure 1 AA is a front view structural diagram of the present invention;

[0015] Figure 3 ,yes Figure 1 BB is a schematic diagram of the top view of the structure of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0017] See also Figure 1 to Figure 3 The present invention includes a concrete foundation 3 and a drill rod storage rack 8. The concrete foundation 3 is directly arranged on the tunnel bottom plate 1. The concrete foundation 3 is set as an inclined surface facing the installation direction of the drilling rig to ensure the drilling angle of the drilling rig. An embedded steel pipe 5 is set along the center line of the inclined well drilling hole in the concrete foundation 3 to reduce the damage to the stability of the foundation and the workload of drilling. An embedded H-steel 4 is set on the inclined surface of the concrete foundation 3, and a drill rod storage rack 8 is set on one side of the concrete foundation 3.

[0018] The concrete foundation slope is perpendicular to the axis of the inclined shaft.

[0019] The concrete foundation 3 is arranged along the width of the tunnel excavation, similar to a trapezoidal structure, with the bottom buried below the tunnel floor 1 to a depth of not less than 700mm, forming a "concave" foundation to increase the foundation's anti-slip ability. The top width of the concrete foundation 3 is not less than 3000mm, the bottom width is not more than 4000mm, and the height is not less than 2350mm. It is cast with concrete of grade C25 to C30.

[0020] The drill rod storage rack 8 is a rectangular structure with a length of not less than 4000mm, a width of not less than 1200mm, and a thickness of not less than 700mm. The bottom is the designed excavation floor elevation of the tunnel and is cast with grade C25~C30 concrete. The location of the arrangement is consistent with the location of the drill rod lifting device of the raise drilling rig, which is conducive to the drilling rig lifting of the drill rod.

[0021] The embedded H-steel 4 has a size of 300mm×300mm×10mm×15mm (height×width×web thickness×flange thickness). Two parallel ones are arranged along the entire length of the inclined surface. The model is H300. The spacing is consistent with the spacing of the anchor bolts of the raise boring rig. They are buried in the concrete for not less than 50mm, and the exposed part is welded to the base of the raise boring rig 6.

[0022] The embedded steel pipe 5 has a size of Φ325×8 (outer diameter×wall thickness), an inner diameter of not less than 300 mm, an upper end flush with the inclined surface of the concrete foundation 3, and a lower end flush with the technical over-excavation bottom plate of the tunnel.

[0023] In the figure, 2 is the top surface of the concrete foundation, 7 is the drilling point of the raise boring machine, and α is the angle of the concrete foundation slope.

[0024] During construction:

[0025] 1) First, the tunnel floor 1 is technically excavated, the excavation length is not less than 4000 mm, the excavation thickness is not less than 700 mm, and the excavation width W is the designed excavation width of the tunnel;

[0026] 2) After the excavation is completed, H-steel 4 and steel pipe 5 are embedded in the foundation range, and finally the reinforced concrete foundation 3 and drill rod storage rack 8 are cast in the formwork (the rock mass is used to bear the force of the drilling rig in the later stage and resist the foundation sliding caused by the horizontal force). After the concrete reaches a strength of more than 75%, the fixed raise drilling rig can be installed;

[0027] 3) First, the base of the drilling rig 6 is welded and reinforced with the embedded H-steel 4, and then various components, drill bits, electrical systems, control systems, measuring devices, etc. are installed in sequence to complete the installation of the raise boring rig.

Claims

1. A construction method for a foundation structure of a gently sloped inclined well drilling rig, characterized in that The foundation structure comprises a concrete foundation (3) and a drill rod storage rack (8). The concrete foundation (3) is arranged on the tunnel bottom plate (1). The concrete foundation (3) is arranged as an inclined surface facing the installation direction of the drilling machine. A pre-buried steel pipe (5) is arranged inside the concrete foundation (3) along the center line of the inclined well borehole. A drill rod storage rack (8) is arranged on one side of the concrete foundation (3). The drill rod storage rack (8) is a rectangular structure with a length of not less than 4000 mm, a width of not less than 1200 mm, and a thickness of not less than 700 mm. The inclined surface of the concrete foundation (3) Embedded H steel (4) is arranged on the top, the concrete foundation slope is perpendicular to the axis of the inclined shaft, the bottom of the concrete foundation (3) is buried below the tunnel bottom plate (1) to a depth of not less than 700mm, the top width is not less than 3000mm, the bottom width is not greater than 4000mm, and the height is not less than 2350mm. The embedded H steel (4) is arranged along the entire length of the inclined surface, the spacing is consistent with the spacing of the anchor bolts of the raise boring machine, and is buried in the concrete by not less than 50mm. The upper end of the embedded steel pipe (5) is flush with the inclined surface of the concrete foundation (3); the construction method comprises the following steps: 1) First, the tunnel floor (1) is technically excavated, the excavation length is not less than 4000 mm, the excavation thickness is not less than 700 mm, and the excavation width W is the designed excavation width of the tunnel; 2) After the excavation is completed, H-steel (4) and steel pipe (5) are embedded in the foundation range, and finally the reinforced concrete foundation (3) and drill rod storage rack (8) are cast in the formwork. After the concrete reaches a strength of 75% or more, the fixed raise drilling rig can be installed; 3) First, the base of the drilling rig (6) is welded and reinforced with the embedded H-steel (4), and then various components, drill bits, electrical systems, control systems, and measuring devices are installed in sequence to complete the installation of the raise boring rig.

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