Construction method capable of effectively shortening excavation period of power station workshop

Abstract

The invention discloses a construction method capable of effectively shortening the excavation period of a power station workshop, and belongs to the technical field of hydropower engineering. Comprising the following steps that S100, a plant excavation body is divided into 12 layers from top to bottom on the basis that conventional plant excavation is divided into seven layers; s201, a ventilation and safety hole is formed in the end, in the length direction, of the top of the plant excavation body; s202, a plurality of tail water branch pipes are arranged on the twelfth layer of the plant excavation body; and S300, a plurality of draw shafts are arranged in the length direction of the plant excavation body, and the draw shafts downwards penetrate through the second layer to the eleventh layer from the bottom of the first layer of the plant excavation body and communicate with the bottom layer gallery. According to the method, the drop shaft penetrating through the 2-11 layers of the plant excavation body is matched with the bottom layer gallery and the tail water branch pipe for deslagging, upper multi-working-face excavation and lower deslagging are achieved, compared with the prior art, the plant excavation speed can be greatly increased, and the target of power generation as early as possible is achieved; in addition, technical equipment adopted by the method is relatively conventional, the universality is relatively high, and large-scale popularization is facilitated.

Description

Technical Field

[0001] The present invention relates to a construction method that can effectively shorten the excavation period of a power station building, belonging to the technical field of hydropower engineering. Background Art

[0002] A pumped-storage power station can undertake tasks such as peak shaving, valley filling, frequency modulation, and emergency standby for synchronous condensers in the power grid. It stores water in a high-level reservoir during the low power demand period and releases the water flow to generate electricity during the high power demand period, thereby realizing the reasonable allocation and balance of electric power.

[0003] The hub buildings of a pumped-storage power station mainly consist of an upper reservoir, a water diversion system, an underground powerhouse, a tailrace system, and a lower reservoir, etc. Among them, the underground powerhouse is the main building in the water diversion and power generation system, with a large span of the cavern, high side walls, multiple caverns, and multiple intersections, and the excavation construction is relatively complex.

[0004] The procedure for conventional underground powerhouse excavation is as Figure 1 shown. The underground powerhouse excavation body 1 is divided into 7 layers along the height direction and excavated layer by layer from top to bottom. Among them, the first and second layers are excavated using the ventilation and safety tunnel 2 at the top as the construction access, and then the third and fourth layers are excavated using the access tunnel 6 to the power station as the construction access, the fifth and sixth layers are excavated using the 4# construction branch tunnel 7 as the construction access, and finally the seventh layer is excavated using the tailrace branch pipe 3 as the construction access.

[0005] Currently, due to the relatively single construction access for each layer of excavation, operations such as drilling, blasting, smoke dispersion, mucking, and support cannot be carried out on multiple working faces, resulting in a longer excavation construction time and seriously delaying the total construction period of key construction projects.

[0006] Therefore, a new solution is needed to solve this problem. Summary of the Invention

[0007] The technical problem to be solved by the present invention is: to provide a construction method that can effectively shorten the excavation period of a power station building, which solves the problem in the prior art that due to the relatively single construction access for each layer of excavation, operations such as drilling, blasting, smoke dispersion, mucking, and support cannot be carried out on multiple working faces, resulting in a longer excavation construction time and seriously delaying the total construction period of key construction projects.

[0008] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions: A construction method that can effectively shorten the excavation period of a power station building, comprising the following steps:

[0009] S100. Divide the powerhouse excavation body into 12 layers from top to bottom on the basis of the conventional seven-layer excavation of the powerhouse.

[0010] S201. Arrange a ventilation and safety tunnel at the end of the top length direction of the factory building excavation body, and then excavate inward along the transverse direction towards the inside of the factory building excavation body until the construction of the first layer is completed;

[0011] S202. While performing step S201, arrange a number of tailwater branch pipes on the 12th layer of the factory building excavation body. The construction team uses the tailwater branch pipes as a construction passage to carry out excavation construction towards the middle of the factory building excavation body, and excavate and penetrate the 12th layer along the length direction of the factory building excavation body until the bottom corridor is formed;

[0012] S300. Arrange a number of ore passes along the length direction of the factory building excavation body. The ore passes penetrate from the bottom of the first layer of the factory building excavation body down through the second to the eleventh layers and are connected to the bottom corridor. The ore passes are used as slag discharge channels for the excavation of the second to the eleventh layers of the factory building excavation body;

[0013] S401. Arrange an access tunnel on the fourth and fifth layers of the factory building excavation body for transporting materials on the fourth to seventh layers of the factory building excavation body;

[0014] S402. Arrange the No. 4 construction access tunnel on the tenth and eleventh layers of the factory building excavation body for transporting materials on the eighth to eleventh layers of the factory building excavation body.

[0015] By adopting the above technical solutions, through the cooperation of the ore passes penetrating the second to the eleventh layers of the factory building excavation body with the bottom corridor and the tailwater branch pipes for slag discharge, multi-face excavation in the upper part and slag discharge in the lower part are realized. The ventilation and safety tunnel, the access tunnel and the No. 4 construction access tunnel transport materials for the excavation of each layer. While ensuring the quality of excavation and support, compared with the prior art, the excavation speed of the factory building can be greatly improved, and the goal of early power generation can be achieved; in addition, the technical equipment adopted in the present invention is relatively conventional and has strong universality, which is convenient for large-scale popularization.

[0016] The present invention is further configured as follows: in S300, the construction team uses a raise boring machine to perform raise boring upward from the bottom corridor until it penetrates the first layer to form a slag chute hole, and then digs the slag chute hole downward from the first layer in the positive direction to form an ore pass.

[0017] The present invention is further configured as follows: the slag material excavated from the ore pass is discharged through the bottom corridor and the tailwater branch pipes.

[0018] The present invention is further configured as follows: in S201, a rock drilling jumbo is used to drill holes, and then blasting is carried out to form a ventilation and safety tunnel, and then excavation construction is carried out inward to excavate and form the first layer of the factory building excavation body.

[0019] The present invention is further configured as follows: S500. On the vertical projection plane of the first layer of the plant excavation body, the plant excavation body is divided into area A, area B, and area C. Among them, area B is within the direct slag discharging coverage of several of the ore passes; area A is outside the direct slag discharging coverage of the ore passes and close to the ventilation and safety tunnel side; area C is outside the direct slag discharging coverage of the ore passes and close to the side of the access tunnel and the No. 4 construction branch tunnel.

[0020] The present invention is further configured as follows: In both area A and area C, the three-boom rock drilling jumbo is used to simultaneously carry out drilling and charging blasting construction, and the slag is transported and unloaded to the nearest ore pass by loaders, bulldozers, and dump trucks, and discharged through the bottom corridor and the tailrace branch pipe until the excavation construction of the second to third layers of the plant excavation body is completed.

[0021] The present invention is further configured as follows: In S401 and S402, the access tunnel and the No. 4 construction branch tunnel are simultaneously excavated inward, and the slag formed by the construction is discharged through the ore pass, the bottom corridor, and the tailrace branch pipe.

[0022] The present invention is further configured as follows: In S300, several of the ore passes are evenly arranged at equal intervals along the length direction of the plant excavation body.

[0023] The present invention is further configured as follows: In S401 and S402, while the access tunnel and the No. 4 construction branch tunnel are being excavated, the tunnel walls are supported by transporting concrete and steel bars.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. By using the ore passes penetrating the second to eleventh layers of the plant excavation body in cooperation with the bottom corridor and the tailrace branch pipe for slag discharging, multi-face excavation in the upper part and slag discharging in the lower part are realized. Compared with the prior art, the excavation speed of the plant can be greatly improved, and the goal of early power generation can be achieved.

[0026] 2. The ventilation and safety tunnel, the access tunnel, and the No. 4 construction branch tunnel transport materials for each layer of excavation, and the ore pass is used for slag discharging. While ensuring the excavation and support quality of the fourth to eleventh layers, drilling, blasting, smoke dispersion, slag discharging, support and other works can be carried out simultaneously, thus shortening the excavation construction time and accelerating the total construction period of key construction projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the construction of a conventional plant excavation body in the prior art;

[0028] Figure 2 It is a schematic diagram of the plant excavation body in the present invention;

[0029] Figure 3 It is a longitudinal sectional view of the construction excavation in the present invention;

[0030] Figure 4 This is the cross-sectional view of the lateral excavation for the construction of the present invention.

[0031] Figure 5 This is the vertical projection view of the first layer of the powerhouse excavation body during the construction of the present invention.

[0032] In the figure: 1. Powerhouse excavation body; 2. Ventilation and safety tunnel; 3. Tailrace branch pipe; 4. Bottom gallery; 5. Chute; 6. Approach tunnel; 7. No. 4 construction access tunnel. Detailed implementation manners

[0033] In order to make it easy to understand the technical means, creative features, achieved purposes and effects of the present invention, the present invention will be further described below with reference to specific drawings.

[0034] As Figure 1 shown, it is a schematic diagram of the longitudinal and cross-sectional views of the excavation construction of the conventional powerhouse excavation body 1 in the prior art. It can be seen from the figure that the conventional powerhouse excavation body 1 is divided into 7 layers from top to bottom during the construction period, and is excavated layer by layer from top to bottom during the construction process. Among them, the first and second layers are excavated with the ventilation and safety tunnel 2 at the top as the construction channel. After that, the approach tunnel 6 is used as the construction channel to excavate the third and fourth layers, the No. 4 construction access tunnel 7 is used as the construction channel to excavate the fifth and sixth layers, and then the tailrace branch pipe 3 is used as the construction channel to excavate the seventh layer.

[0035] As Figures 2 to 5 shown, the present application provides a construction method that can effectively shorten the excavation period of the powerhouse, which is applicable to the working conditions where the surrounding rock geological conditions of the powerhouse excavation body 1 are good, there are no other adverse geological conditions, and the bearing capacity of the surrounding rock meets the construction requirements. The method includes the following steps:

[0036] S100. Divide the powerhouse excavation body 1 into 12 layers from top to bottom on the basis of the conventional seven-layer powerhouse excavation.

[0037] S201. Arrange the ventilation and safety tunnel 2 at the end of the top length direction of the powerhouse excavation body 1, and then excavate inward along the transverse direction into the powerhouse excavation body 1 until the construction of the first layer is completed. Specifically, first use a rock drilling jumbo to drill holes on the rock wall surface, and then blast to form the ventilation and safety tunnel 2, and then excavate inward from this to excavate and form the first layer of the powerhouse excavation body 1

[0038] S202. While performing step S201, excavate the 12th layer and arrange a number of tailrace branch pipes 3 along the length direction of the powerhouse excavation body 1 on the 12th layer of the powerhouse excavation body 1. The construction team uses the tailrace branch pipe 3 as the construction channel to excavate towards the middle of the powerhouse excavation body 1, and excavate and penetrate the 12th layer along the length direction of the powerhouse excavation body 1 until the bottom gallery 4 is formed.

[0039] S300. A number of ore passes 5 are arranged at equal intervals along the length direction of the plant excavation body 1. The ore pass 5 penetrates from the bottom of the first layer of the plant excavation body 1 downward through the second to the eleventh layers and is connected to the bottom gallery 4. The ore pass 5 is used as the slag discharge channel for the excavation of the second to the eleventh layers of the plant excavation body 1. Among them, the ore pass 5 is formed by the raise boring method. Specifically, the construction team uses a raise boring rig to conduct raise boring upward from the bottom gallery 4 until it penetrates the first layer to form a slag discharge hole. The diameter of the slag discharge hole is relatively small and is used for slag discharge during the preliminary excavation of the ore pass 5. Then, the slag discharge hole is excavated downward from the first layer in the positive direction to expand the diameter of the slag discharge hole until the ore pass 5 is formed. In addition, the slag material formed during the excavation of the ore pass 5 is also discharged through the bottom gallery 4 and the tail water branch pipe 3;

[0040] S401. The access tunnel 6 is arranged on the fourth and fifth layers of the plant excavation body 1 and is used for the transportation of materials on the fourth to seventh layers of the plant excavation body 1;

[0041] S402. The No. 4 construction access tunnel 7 is arranged on the tenth and eleventh layers of the plant excavation body 1 and is used for the transportation of materials on the eighth to eleventh layers of the plant excavation body 1;

[0042] It should be noted that the inward construction of the access tunnel 6 and the No. 4 construction access tunnel 7 both adopt the same drilling and blasting method as the ventilation and safety tunnel 2 to complete the preliminary excavation;

[0043] Secondly, in S401 and S402, the access tunnel 6 and the No. 4 construction access tunnel 7 are excavated inward synchronously and in layers. The slag material formed during the construction is discharged from the ore pass 5, the bottom gallery and the tail water branch pipe 3. Specifically, the materials transported during the construction of S401 and S402 include steel bars and concrete, which are used to carry out support during the inward construction of the access tunnel 6 and the No. 4 construction access tunnel 7 to ensure the support quality and avoid collapse;

[0044] S500. As shown in Figure 3 and Figure 5 , on the vertical projection plane of the first layer of the plant excavation body 1, the plant excavation body 1 is divided into area A, area B and area C. Among them, area B is within the direct slag discharge coverage range of a number of ore passes 5 and can be divided into areas B1, B2, B3, B4 according to the number of ore passes 5, and so on. Area A is outside the direct slag discharge coverage range of the ore pass 5 and is close to the side of the ventilation and safety tunnel 2. Area C is outside the direct slag discharge range of the ore pass 5 and is close to the side of the access tunnel 6 and the No. 4 construction access tunnel 7. Among them, in both area A and area C, the three-boom rock drilling jumbo is used to conduct drilling and charging blasting construction simultaneously, and the slag material is transported and unloaded to the nearest ore pass 5 by loaders, bulldozers and dump trucks, and is discharged through the bottom gallery and the tail water branch pipe 3 until the excavation construction of the second to third layers of the plant excavation body 1 is completed.

[0045] With the construction method of the present application, the ore pass 5 penetrating the 2nd to 11th layers of the powerhouse excavation body 1 is used to cooperate with the bottom gallery 4 and the tail water branch pipe 3 for slag discharge, and the 1st layer and the 12th layer are excavated synchronously. At the same time, after the ore pass 5 is constructed, the access tunnel 6 and the 4# construction access tunnel 7 are respectively used as construction channels to be responsible for the synchronous layered excavation of the 4th to 7th layers and the 8th to 11th layers, realizing the simultaneous excavation of multiple working faces in the upper part and slag discharge in the lower part. Compared with the prior art, the excavation speed of the powerhouse is greatly improved, and the goal of early power generation is achieved;

[0046] In addition, the ventilation and safety tunnel 2, the access tunnel 6 and the 4# construction access tunnel 7 transport materials for each layer of excavation, and the ore pass 5 is used for slag discharge, enabling the layered excavation of the 4th to 11th layers to carry out drilling, blasting, smoke dispersion, slag discharge, support and other operations simultaneously while ensuring the quality of excavation and support, thereby shortening the excavation construction time and accelerating the total construction period of key construction projects.

[0047] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and various changes and improvements will occur to the present invention without departing from the spirit and scope of the present invention, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A construction method that can effectively shorten the excavation period of a power plant building, characterized in that: The following steps are involved: S100, dividing the factory building excavation body (1) into 12 layers from top to bottom based on the seven layers of conventional factory building excavation; S201, arranging a ventilation and safety hole (2) at the end of the top length direction of the powerhouse excavation body (1), and then excavating in the transverse direction toward the inside of the powerhouse excavation body (1) until the construction of the first layer is completed; S202, while performing step S201, a plurality of tailwater branch pipes (3) are arranged on the 12th floor of the powerhouse excavation body (1), and the construction team uses the tailwater branch pipes (3) as a construction channel to perform excavation construction in the direction of the middle of the powerhouse excavation body (1), and excavates along the length direction of the powerhouse excavation body (1) and penetrates the 12th floor until a bottom floor corridor (4) is formed; S300, arranging a plurality of chutes (5) along the length direction of the factory building excavation body (1), wherein the chutes (5) extend from the bottom of the first layer of the factory building excavation body (1) downward through the second to the eleventh layers and are connected to the bottom gallery (4), and the chutes (5) are used as slag discharge channels for the excavations of the second to the eleventh layers of the factory building excavation body (1); S401, arranging a factory access tunnel (6) on the 4th and 5th floors of the factory building excavation body (1) for transporting materials on the 4th to 7th floors of the factory building excavation body (1); S402, arranging a 4# construction branch tunnel (7) on the 10th and 11th floors of the factory building excavation body (1) for transporting materials from the 8th to the 11th floors of the factory building excavation body (1).

2. A construction method according to claim 1 that can effectively shorten the excavation period of a power plant building, characterized in that: In S300, the construction team performs reverse well construction upwards from the bottom corridor (4) by means of a reverse well drilling machine until the first layer is penetrated to form a slag chute, and then excavates the slag chute in a positive direction downwards from the first layer to form a chute (5).

3. A construction method according to claim 2 that can effectively shorten the excavation period of a power plant building, characterized in that: The slag excavated from the chute (5) is discharged through the bottom gallery (4) and the tailwater branch pipe (3).

4. A construction method according to claim 1 that can effectively shorten the excavation period of a power plant building, characterized in that: In S201, a drilling rig is used to drill a hole, which is then blasted to form a ventilation and safety hole (2), and excavation is then carried out inwards to form the first layer of the plant excavation body (1).

5. A construction method capable of effectively shortening the excavation period of a power plant building according to claim 1, characterized in that: S500. The factory excavation body (1) is divided into area A, area B and area C on the vertical projection plane of the first layer of the factory excavation body (1), wherein area B is located within the direct slag discharge coverage of the plurality of chutes (5), area A is located outside the direct slag discharge coverage of the chutes (5) and close to the ventilation and safety tunnel (2), and area C is located outside the direct slag discharge coverage of the chutes (5) and close to the factory access tunnel (6) and the 4# construction branch tunnel (7).

6. A construction method capable of effectively shortening the excavation period of a power plant building according to claim 5, characterized in that: The A and C areas are both constructed by drilling and charging blasting simultaneously using a three-arm drilling rig, and the slag is transported to the nearest chute (5) by a loader, a bulldozer and a dump truck, and the slag is discharged through the bottom gallery and the tailwater branch pipe (3) until the excavation of the second to third layers of the plant excavation body (1) is completed.

7. A construction method capable of effectively shortening the excavation period of a power plant building according to claim 6, characterized in that: In S401 and S402, the plant access tunnel (6) and the 4# construction branch tunnel (7) are excavated inwards simultaneously, and the slag formed by the construction is discharged from the chute (5), the bottom gallery and the tailwater branch pipe (3).

8. A construction method capable of effectively shortening the excavation period of a power plant building according to claim 1, characterized in that: In S300, the plurality of chutes (5) are evenly arranged at equal intervals along the length direction of the factory building excavation body (1).

9. A construction method for effectively shortening the excavation period of a power plant building according to claim 7, characterized in that: In S401 and S402, the factory access tunnel (6) and the 4# construction branch tunnel (7) are excavated while supporting the tunnel walls by transporting concrete and steel bars.

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