A construction method for reinforcing the shaft opening of a pumped storage power station

Abstract

The invention discloses a construction method for reinforcing a shaft opening of a pumped-storage power station, including: constructing a pumped-storage power station shaft opening reinforcement structure to stably reinforce the shaft opening of the power station. The vibration-cracked rock layer is fixedly connected to a post-cast reinforcement layer cast later through a plurality of implanted reinforcement bodies and a plurality of transverse reinforcements to form a whole, and the anchor cable can effectively connect and reinforce the post-cast reinforcement layer, the vibration-cracked rock layer and the original rock layer, thereby ensuring the stability of the shaft opening reinforcement of the pumped-storage power station, and solving the problem that the reinforced concrete reinforcement layer formed by casting the inner diameter surface of the wellhead cannot effectively reinforce and connect the vibration-cracked rock layer with the original rock layer.

Description

Technical Field

[0001] The invention relates to a construction method for reinforcing a vertical shaft opening of a pumped storage power station, and belongs to the technical field of vertical shafts. Background Art

[0002] When the construction environment of the power station shaft for installing turbine generators is a rock structure, it is necessary to first blast and loosen the rock at the power station shaft mouth before using engineering machinery to dig downward step by step. When excessive blasting causes excessive loosening of the rock, the loose rock at the power station shaft mouth needs to be reinforced.

[0003] The existing wellhead reinforcement technology is disclosed in Chinese Patent Publication No. CN108222071A. Although reinforcement can be achieved by pouring a reinforced concrete reinforcement layer on the inner diameter surface of the wellhead, it is impossible to effectively reinforce and connect the vibration-fractured rock layer with the original rock layer. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a construction method for reinforcing a shaft opening of a pumped storage power station.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a construction method for reinforcing a shaft opening of a pumped storage power station, comprising:

[0007] The construction process of constructing a pumped storage power station shaft mouth reinforcement structure to stabilize and reinforce the power station shaft mouth.

[0008] The construction process includes the steps of cleaning, reinforcing bar embedding, formwork casting and anchoring in sequence.

[0009] The cleaning step is: using engineering machinery to clean the loosened rock strata caused by excessive blasting at the wellhead of the power station shaft until the rock strata are fractured.

[0010] The reinforcement embedding steps are as follows: burying fixed transverse reinforcements in the vertical direction of the vibration-cracked rock stratum, wherein the transverse reinforcements are distributed in multiple intervals; drilling holes in the horizontal plane of the vibration-cracked rock stratum and placing the reinforcement bodies, wherein the reinforcement bodies are distributed in multiple intervals, and the steel bars and grouting pipes of the reinforcement bodies are lowered into the vibration-cracked rock stratum together, and concrete slurry is injected into the grouting pipe, and the concrete slurry is discharged from the slurry discharge holes of the grouting pipe. At this time, the concrete slurry can fill and penetrate into the cracks in the vibration-cracked rock stratum. After the concrete slurry is solidified, the reinforcement body is fixed in the vibration-cracked rock stratum; with the supporting cross section on the reinforcement body as support, horizontal surface reinforcement is bundled, and the ends of the transverse reinforcements have notches to hook onto the surface reinforcements.

[0011] The formwork casting steps are as follows: a formwork is set up in the vertical shaft space of the power station away from the vibration-cracked rock layer, and concrete is poured into the space to form a post-cast reinforcement layer after solidification. At this time, the surface reinforcement, transverse reinforcement and implanted reinforcement body are all in the post-cast reinforcement layer.

[0012] The anchoring step is: installing anchor cables on the post-cast reinforcement layer, the vibration-cracked rock layer and the original rock layer for tension anchoring, the anchor cables use the original rock layer as the force point to pull the post-cast reinforcement layer and squeeze the vibration-cracked rock layer for reinforcement, and at this time, a vertical shaft mouth reinforcement structure of the pumped-storage power station is constructed.

[0013] The beneficial effects of the present invention are as follows: the vibration-cracked rock stratum is fixedly connected to the later-cast post-cast reinforcement layer through multiple embedded reinforcement bodies and multiple transverse reinforcements to form a whole, and the anchor cable can effectively connect and reinforce the post-cast reinforcement layer, the vibration-cracked rock stratum and the original rock stratum, thereby ensuring the stability of the shaft wellhead reinforcement of the pumped-storage power station, and solving the problem that the reinforced concrete reinforcement layer formed by casting the inner diameter surface of the wellhead cannot effectively reinforce and connect the vibration-cracked rock stratum with the original rock stratum. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the power station shaft reinforcement of the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of the present invention without a post-cast reinforcement layer;

[0016] Figure 3 It is a structural schematic diagram of the tendon implant and gluten distribution of the present invention;

[0017] Figure 4 It is a schematic structural diagram of the distribution of the implanted tendon, the tendon, the vibration-cracked rock layer, and the original rock layer of the present invention;

[0018] In the figure: 1-power station shaft; 2-vibration-fractured rock layer; 3-original rock layer; 4-transverse reinforcement; 5-surface reinforcement; 6-post-cast reinforcement layer; 8-anchor cable; 10-rebar implant body; 11-rebar; 12-grouting pipe; 13-grouting hole; 14-support cross section. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0020] like Figures 1 to 4 shown.

[0021] The present invention provides a construction method for reinforcing a shaft opening of a pumped storage power station, comprising the following steps:

[0022] Cleaning. The loosened rock layer caused by excessive blasting at the wellhead of the power station shaft 1 is cleaned by engineering machinery to the fractured rock layer 2. The fractured rock layer 2 has only cracks but has not been loosened and separated from the original rock layer 3. Therefore, the excavator and other engineering machinery cannot clean the fractured rock layer 2 out of the original rock layer 3.

[0023] Embedding reinforcement. Transverse reinforcement 4 is embedded vertically in the vibration-cracked rock stratum 2, and the transverse reinforcement 4 is distributed in multiple intervals. After drilling holes on the vibration-cracked rock stratum 2 and filling them with concrete, the transverse reinforcement 4 is embedded and solidified; holes are drilled in the horizontal plane of the vibration-cracked rock stratum 2 to place the reinforcement body 10, and the reinforcement body 10 is distributed in multiple intervals. The steel bars 11 of the reinforcement body and the grouting pipe 12 are lowered into the vibration-cracked rock stratum 2 together, and concrete slurry is injected into the grouting pipe 12. The concrete slurry is discharged from the slurry discharge hole 13 of the grouting pipe 12. At this time, the concrete slurry can fill and penetrate into the cracks of the vibration-cracked rock stratum 2. After the concrete slurry is solidified, the reinforcement body 10 is fixed in the vibration-cracked rock stratum 2; with the support cross section 14 on the reinforcement body 10 as support, the horizontal surface reinforcement 5 is bundled, and the end of the transverse reinforcement 4 has a notch to hook onto the surface reinforcement 5.

[0024] Formwork casting: A formwork is set up in the power station shaft 1 space far away from the vibration-fractured rock layer 2, and concrete is poured into it to form a post-cast reinforcement layer 6 after solidification. At this time, the surface reinforcement 5, the transverse reinforcement 4 and the implanted reinforcement body are all in the post-cast reinforcement layer 6.

[0025] Anchoring. Anchor cables 8 are installed on the post-cast reinforcement layer 6, the vibration-cracked rock layer 2 and the original rock layer 3 for tension anchoring. The anchor cables 8 use the original rock layer 3 as the force point to pull the post-cast reinforcement layer 6 to squeeze the vibration-cracked rock layer 2 for reinforcement. At this time, the shaft mouth reinforcement structure of the pumped-storage power station is constructed. During formwork casting, pipes are pre-buried in the post-cast reinforcement layer 6 and the formwork, so that an anchoring channel can be formed inside the post-cast reinforcement layer 6 after the formwork is removed, avoiding the need to drill holes in the post-cast reinforcement layer 6 later. When the anchor holes are drilled in the vibration-cracked rock layer 2 and the original rock layer 3 after the post-cast reinforcement layer 6 is formed, the vibration-cracked rock layer 2 will no longer be broken for the second time, thereby ensuring the integrity of the vibration-cracked rock layer 2. At the same time, the concrete slurry when casting the post-cast reinforcement layer 6 can be filled into the vibration-cracked rock layer 2 for reinforcement.

[0026] Since the vibration-cracked rock stratum 2 is fixedly connected to the later poured post-cast reinforcement layer 6 through multiple embedded reinforcement bodies 10 and multiple transverse reinforcements 4 to form a whole, and the anchor cable 8 can effectively connect and reinforce the post-cast reinforcement layer 6, the vibration-cracked rock stratum 2 and the original rock stratum 3, the stability of the shaft wellhead reinforcement of the pumped-storage power station is ensured, and the problem that the reinforced concrete reinforcement layer formed by pouring the inner diameter surface of the wellhead cannot effectively reinforce and connect the vibration-cracked rock stratum with the original rock stratum is solved.

[0027] The above-mentioned shaft mouth reinforcement structure of a pumped storage power station comprises:

[0028] The original rock layer 3 is integrated with the construction mountain, and there is a power station shaft 1 space in the middle of the original rock layer 3;

[0029] A vibration-fractured rock layer 2 is located on the inner diameter surface of the original rock layer 3, and a transverse reinforcement 4 is embedded and fixed on the vertical surface of the vibration-fractured rock layer 2. The transverse reinforcement 4 is a plurality of reinforcements distributed in a circumferential array at intervals. A reinforcement body 10 is fixedly placed on the horizontal surface of the transverse reinforcement 4. The reinforcement body 10 is a plurality of reinforcements distributed in a circumferential array at intervals.

[0030] There is a post-cast reinforcement layer 6 with surface reinforcement 5 inside, and the surface reinforcement 5, transverse reinforcement 4 and implanted reinforcement body 10 are wrapped by the post-cast reinforcement layer 6. The post-cast reinforcement layer 6 is connected to the vibration-cracked rock layer 2 at multiple locations through multiple transverse reinforcements 4 and implanted reinforcement bodies 10.

[0031] The post-cast reinforcement layer 6, the vibration-cracked rock layer 2 and the original rock layer 3 are penetrated by anchor cables 8 for tensioning and anchoring.

[0032] The above-mentioned reinforcing bar implant 10 for reinforcing a wellhead of a power station comprises:

[0033] The invention comprises three steel bars 11 which are fixed by welding in contact with each other. A grouting pipe 12 is fixed by welding in contact with the steel bars 11. The grouting pipe 12 is provided with a grouting pipe 12 for discharging grout.

[0034] The steel bars 11 are welded with vertically distributed support cross sections 14 , on which surface bars 5 are laid and tied. The horizontal surface bars 5 are supported on the support cross sections 14 and are spaced to be on the horizontal plane of the rock layer 2 that is vibrated and fractured.

[0035] The surface reinforcement 5 is hooked with the transverse reinforcement 4, and the transverse reinforcement 4 is embedded and fixed in the vertical surface of the vibration-fractured rock layer 2.

[0036] When the reinforcement 5 is erected, the reinforcement 5 is supported on the supporting cross section 14 of the reinforcement body 10 and is spaced apart on the horizontal plane of the vibration-fractured rock layer 2, thereby solving the problem of the prior art that there is no supporting point to support the reinforcement in a horizontal state.

Claims

1. A construction method for reinforcing a shaft opening of a pumped storage power station, characterized in that: include: The construction process of constructing a pumped storage power station shaft mouth reinforcement structure to stabilize and reinforce the shaft mouth of the power station shaft (1); The construction process includes the steps of cleaning, reinforcing bar embedding, formwork casting and anchoring in sequence; The cleaning step comprises: using engineering machinery to clean the loosened rock layer caused by excessive blasting at the wellhead of the power station shaft (1) to the rock layer (2) that has been vibrated and fractured; The reinforcing bar embedding steps are as follows: vertically embedding fixed transverse reinforcing bars (4) in the vibration-fractured rock stratum (2), wherein the transverse reinforcing bars (4) are distributed in a plurality of intervals; drilling holes in the horizontal plane of the vibration-fractured rock stratum (2) and placing a reinforcing bar body (10), wherein the reinforcing bar body (10) is distributed in a plurality of intervals, and the reinforcing bars (11) and the grouting pipe (12) of the reinforcing bar body are lowered into the vibration-fractured rock stratum (2) together, and concrete slurry is injected into the grouting pipe (12), and the concrete slurry is discharged from the slurry discharge hole (13) of the grouting pipe (12), at which time the concrete slurry can fill and penetrate into the cracks of the vibration-fractured rock stratum (2), and after the concrete slurry is solidified, the reinforcing bar body (10) is fixed in the vibration-fractured rock stratum (2); horizontal surface reinforcing bars (5) are bundled with the support transverse section (14) on the reinforcing bar body (10), and the end of the transverse reinforcing bar (4) has a notch to hook onto the surface reinforcing bar (5); The formwork pouring step comprises: setting up a formwork in the power station shaft (1) away from the vibration-fractured rock layer (2), pouring in concrete, and forming a post-cast reinforcement layer (6) after solidification, wherein the surface reinforcement (5), the transverse reinforcement (4) and the implanted reinforcement body are all in the post-cast reinforcement layer (6); The anchoring step comprises: installing anchor cables (8) on the post-cast reinforcement layer (6), the vibration-cracked rock layer (2) and the original rock layer (3) for tension anchoring; the anchor cables (8) use the original rock layer (3) as a force point to pull the post-cast reinforcement layer (6) and squeeze the vibration-cracked rock layer (2) for reinforcement, thereby constructing a vertical shaft mouth reinforcement structure of the pumped storage power station.

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