CN115045670B - Rock pipe jacking method and drilling and blasting method combined construction method for water delivery tunnel - Google Patents
Rock pipe jacking method and drilling and blasting method combined construction method for water delivery tunnel Download PDFInfo
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- CN115045670B CN115045670B CN202210965558.8A CN202210965558A CN115045670B CN 115045670 B CN115045670 B CN 115045670B CN 202210965558 A CN202210965558 A CN 202210965558A CN 115045670 B CN115045670 B CN 115045670B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 230
- 238000010276 construction Methods 0.000 title claims abstract description 109
- 238000005553 drilling Methods 0.000 title claims abstract description 79
- 238000005422 blasting Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 62
- 239000011435 rock Substances 0.000 title claims abstract description 42
- 238000004880 explosion Methods 0.000 claims description 17
- 238000009412 basement excavation Methods 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 5
- 239000004567 concrete Substances 0.000 claims description 4
- 239000011083 cement mortar Substances 0.000 claims description 2
- 239000011150 reinforced concrete Substances 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 230000009974 thixotropic effect Effects 0.000 claims description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
- E02B9/06—Pressure galleries or pressure conduits; Galleries specially adapted to house pressure conduits; Means specially adapted for use therewith, e.g. housings, valves, gates
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a combined construction method of a rock pipe jacking method and a drilling and blasting method of a water delivery tunnel, which comprises the following steps: constructing a pipe jacking working well at one side of the river bank protection in the water source region; the rock pipe jacking machine jacks from the pipe jacking working well to the main branch tunnel junction; excavating construction branch holes outside the protection area of the high-speed rail line by adopting a drilling and blasting method until reaching a main branch hole intersection; after the top pipe section of the water delivery tunnel is excavated to the main branch intersection, the pipe jacking machine withdraws from the construction branch; ventilating and deslagging by utilizing a construction branch tunnel, and excavating a drilling and blasting section of the water delivery tunnel by adopting a drilling and blasting method; lining construction of a drilling and blasting section of the water delivery tunnel, a main branch tunnel intersection and a construction branch tunnel is sequentially carried out; the pipe-jacking working well is transformed into a water inlet of a water delivery tunnel. The invention adopts the rock pipe jacking machine to construct the water delivery tunnel in the high-speed rail line protection area, the water delivery tunnel outside the drilling and blasting construction protection area range and the construction branch tunnel thereof, and has the advantages of investment saving, fast progress, strong terrain adaptability, high construction branch tunnel utilization rate, reduced policy processing difficulty, environment-friendly water inlet construction and the like.
Description
Technical Field
The invention relates to the technical field of tunnel construction of hydraulic and hydroelectric engineering, in particular to a combined construction method which adopts a rock pipe jacking method for construction in a protective area and a drilling and blasting method for construction outside the protective area when a diversion and water transfer engineering constructs a water delivery tunnel in the protective area of a high-speed railway.
Background
Diversion water works are one of the important construction contents of national water network works as a main technical means for optimizing water resource allocation.
The cross-basin diversion project is also called as a water transfer project, water needs to pass through a mountain body for water delivery, the structural form of a water delivery line is mainly a tunnel, and the main construction methods of the water delivery tunnel include a drilling and blasting method and a TBM (tunnel boring and blasting) method. The drilling and blasting method has strong stratum adaptability, low manufacturing cost and comprehensive utilization of hole slag, and is widely applied to water conservancy and hydropower engineering, but the ventilation and slag discharge requirements are considered, a construction branch hole is required to be arranged to realize 'short-cut drilling of a long hole', the length of a single working face is generally not more than 3.0km, and the length of the single working face is not more than 3.5km in a limit state; the length of a single working face of the TBM method is basically not limited by ventilation, the automation degree is high, the influence on surrounding rock disturbance is small, the influence on the surrounding environment is small, however, the tunnel slag is difficult to comprehensively utilize, the total excavation unit price is high, and the TBM method is often adopted when a long-distance water delivery tunnel is not provided with a construction branch tunnel or the water delivery tunnel crosses sensitive buildings such as a high-speed railway tunnel and an expressway tunnel in a short distance. When the total length of the water delivery tunnel is less than 7.0km, if the TBM method is adopted for construction, and the cost of newly purchased equipment is amortized, the excavation unit price is generally about twice higher than that of the drilling and blasting method.
The protection area range of the high-speed rail line is 1km on each of two sides of the line, a water delivery tunnel constructed in the protection area range is not allowed to be constructed by adopting a drilling and blasting method, and a conventional construction method can only select a TBM method, so that the total engineering cost of the iron-involved tunnel is high. Even if the existing equipment is rented for TBM construction in the high-speed rail line protection area range in consideration of the water delivery tunnel, the drilling and blasting construction is changed after the water delivery tunnel passes through the high-speed rail protection area range, and the unit price of the equipment after the equipment is amortized and sold is still higher. And the water delivery tunnel is constructed by combining a TBM method and a drilling and blasting method, and after the water delivery tunnel is excavated out of the range of a high-speed rail protection area in a mountain, the water delivery tunnel is converted into the drilling and blasting method, wherein the water delivery tunnel only adopts a pre-constructed drilling and blasting section so that TBM equipment is pushed out of the water delivery tunnel or a shaft is arranged to disassemble a TBM in sections and is hung out. The tunnel at the drilling and blasting section in the TBM idle push out tunnel mode also meets the condition that the turning radius is not less than 500 m; the vertical shaft is arranged, so that not only is proper terrain conditions required, namely the upper mountain cannot be too high, but also the problem that the ground is difficult to be gathered on an access road on the upper part of a newly-increased vertical shaft is solved.
In recent years, protective construction is carried out on a water conveying tunnel by adopting construction methods such as water mill drilling and rock jacking pipes in the protection range of sensitive buildings, and the two construction methods are high in overall unit price and only suitable for short-distance construction. In addition, the water mill drill construction progress is slow, and when the length of the water delivery tunnel in a high-speed railway line protection area is large, the total construction period is easily limited. The maximum pipe diameter of the rock jacking pipe is about 4m, and for a water delivery tunnel needing larger water delivery capacity, the pipe diameter of a single pipe is smaller, most importantly, a receiving well needs to be arranged, the receiving well is limited by the topographic conditions set by a vertical shaft, and the approach road policy is difficult to handle.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a construction method combining a rock pipe jacking method and a drilling and blasting method for a water delivery tunnel, wherein a construction branch hole is also used as a receiving well of a rock pipe jacking machine, the rock pipe jacking is utilized to penetrate through the water delivery tunnel in a high-speed railway line protection area, the water delivery tunnel outside the protection area and the construction branch hole are constructed by the drilling and blasting method, and lining can be carried out after the construction branch hole is finished, so that the water delivery tunnel can be reconstructed into a pressure regulating well in the operation period of the water delivery tunnel and an overhaul traffic tunnel when the water delivery tunnel is empty.
In order to achieve the purpose, the invention adopts the following technical scheme:
a rock pipe jacking method and drilling and blasting method combined construction method for a water delivery tunnel comprises the following steps:
s1, constructing a pipe-jacking working well at the head of a pipe-jacking section of the water delivery tunnel and on one side of a river bank protection of a water source region;
s2, excavating a pipe jacking section of the water delivery tunnel, and jacking a rock pipe jacking machine from a pipe jacking working well to a main branch tunnel intersection;
s3, excavating construction branch holes outside the high-speed rail line protection area by adopting a drilling and blasting method until the intersection of the branch holes;
s4, after the top pipe section of the water delivery tunnel is excavated to the main branch junction, the pipe jacking machine withdraws from the construction branch;
s5, ventilating and deslagging by utilizing the construction branch tunnel, and excavating a drilling explosion section of the water delivery tunnel by adopting a drilling explosion method;
s6, after excavation of the drilling and blasting sections of the water delivery tunnel is completed, lining construction of the drilling and blasting sections of the water delivery tunnel, the main branch intersection and the construction branch tunnel is carried out;
s7, transforming the pipe-jacking working well into a water inlet of a water delivery tunnel.
When the whole water delivery tunnel adopts pressure water delivery, the elevation of the main branch hole intersection is basically consistent with the elevation of the top pipe section of the water delivery tunnel and the elevation of the bottom of the drilling and blasting section of the water delivery tunnel; when the water delivery tunnel top pipe section adopts pressure water delivery and the water delivery tunnel drilling explosion section adopts a non-pressure water delivery scheme, the elevation of the main branch hole intersection is basically consistent with that of the water delivery tunnel top pipe section but is lower than that of the bottom of the water delivery tunnel drilling explosion section.
Because the maximum pipe diameter of the rock jacking pipe is about 4.0m, in order to increase the water delivery capacity, the design of a pressure pipeline is generally adopted, the jacking pipe section of the water delivery tunnel can be arranged singly, or a plurality of jacking pipe sections can be arranged in parallel at intervals in a short distance, and the net distance between different jacking pipes is not less than 1 time of the external diameter of the jacking pipe in principle.
If the water delivery tunnel pipe jacking section adopts pressure water delivery, the water delivery tunnel drilling explosion section adopts a non-pressure water delivery scheme, after the pipe pushing machine withdraws, the outlet of the water delivery tunnel pipe jacking section needs to be temporarily sealed by adopting a steel plate, the temporary pad slag constructed at the bottom of the main branch hole intersection is flushed with the bottom of the water delivery tunnel drilling explosion section, and then the water delivery tunnel drilling explosion section is excavated by adopting a drilling explosion method.
If water delivery tunnel push pipe section adopts to press water delivery, water delivery tunnel to bore and explodes the section and adopt the non-pressure water delivery scheme, main tributary hole intersection mouth bottom elevation is less than water delivery tunnel and bores and explode section bottom elevation, need to intersect main tributary hole and mouthful design for narrow height shape section, and main tributary hole intersection mouth top and water delivery tunnel bore and explode the section top and flush basically.
The beneficial effects of the invention are:
1. the investment saving progress is fast. The non-blasting excavation construction of the water delivery tunnel in the high-speed rail line protection area is met, meanwhile, the long-distance construction of the water delivery tunnel by adopting TBM or rock jacking pipes is avoided, and the engineering investment is effectively saved; the top pipe section and the construction branch tunnel of the water delivery tunnel can be constructed synchronously, so that the construction period is saved.
2. The terrain adaptability is strong. When a water delivery tunnel in a high-speed rail line protection area is constructed by adopting TBM, the TBM starting tunnel with the length of about 150m can only be constructed by adopting non-blasting excavation, so that the TBM starting tunnel can only be used as a TBM outlet working face, and a construction site with the length of not less than 200m and the width of not less than 20m needs to be additionally searched outside the range of the high-speed rail line protection area to be used as a starting working face; and the rock pipe jacking working well with the diameter of 4.0m only needs a construction site with the size of about 20.0m multiplied by 12.0m (length multiplied by width), and has strong terrain adaptability.
3. The construction branch hole has high utilization rate. The construction branch tunnel outside the high-speed rail line protection area is not only a channel for excavating, deslagging, ventilating and draining the drilling explosion section of the downstream water conveying tunnel, but also a pipe jacking machine receiving well of the top pipe section of the upstream water conveying tunnel in the construction period. After the construction of the branch tunnel lining is rebuilt, the construction branch tunnel can be used as a surge shaft, an exhaust port and even a water diversion port of a water delivery tunnel in the operation period; when the water delivery tunnel is empty, the construction branch tunnel can also be used as a maintenance traffic tunnel for vehicles to directly enter and exit, and the tunnel has multiple purposes.
4. The difficulty of policy processing is reduced. The water inlet adopts the pressure water delivery of little tunnel diameter, has reduced the requirement to water inlet water intaking submergence water level, has indirectly reduced the river course in water supply district and has blocked the weir height to reduce the permanent land acquisition in the upstream river course flood inundation scope, reduced the policy and handled the degree of difficulty.
5. The water inlet construction is environment-friendly. The top pipe working well is transformed into the water inlet, only a gate needs to be additionally arranged and the wall of the working well close to the river channel side needs to be removed during transformation, the upper structure of the water inlet is constructed on three walls of the working well reserved, construction of the earth-rock cofferdam is not needed in the river bank flood-crossing period, and influence on the surrounding environment is reduced.
Drawings
FIG. 1 is a flow chart of a rock pipe jacking method and a drilling and blasting method combined construction method for a water delivery tunnel provided by the embodiment of the invention;
FIG. 2 is a plan layout view of a water tunnel using the construction method of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a cross-sectional view B-B of FIG. 2;
FIG. 5 is a cross-sectional view C-C of FIG. 2;
FIG. 6 is a cross-sectional view taken along line D-D of FIG. 2;
FIG. 7 is a sectional view A-A of the pipe-jacking working well after the pipe-jacking working well is reformed into a water inlet in the operation period;
FIG. 8 is a longitudinal sectional view of a water tunnel using the construction method of the present invention, which is constructed to convey water under pressure as a whole.
In the figure: 1-a water delivery tunnel; 1 a-a top pipe section of a water delivery tunnel; 1 b-a water conveying tunnel drilling and blasting section; 2, constructing branch holes; 3-main branch hole junction; 4-pipe jacking working well; 5-water source area river channel; 6-water blocking weir; 7-river channel of water receiving area; 8-high-speed rail line; 9-protection zone range boundary; 10-water inlet.
Detailed Description
The technical scheme of the invention is clearly and completely described below by combining the attached drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a rock pipe jacking method and drilling and blasting method combined construction method for a water delivery tunnel, which is suitable for construction of the water delivery tunnel in a range of passing through a high-speed rail line protection area. As shown in fig. 1 to 8, the method includes the following steps:
s1, a pipe-jacking working well 4 is constructed at the head of a water delivery tunnel top pipe section 1a and on one side of a water source region river course 5 revetment.
The pipe jacking working well 4 is of a reinforced concrete structure, the top elevation needs to meet the flood control elevation requirement of the river channel 5 in the water source area, and the bottom elevation is lower than the top pipe section 1a of the water delivery tunnel and higher than the bottom elevation of the river channel 5 in the water source area, so that siltation is avoided.
S2, excavating a top pipe section 1a of the water delivery tunnel, and jacking a rock pipe jacking machine from a pipe jacking working well 4 to a main branch tunnel intersection port 3.
According to the construction of the rock pipe jacking machine, a steel pipe, a PCCP pipe and the like are used as pipe jacking pipes according to the internal pressure of water delivery, the friction force of the pipe walls of the pipe jacking pipes is reduced by injecting thixotropic slurry in the pipe jacking construction process, cement mortar is directly injected between the pipes and a tunnel through grouting holes in the pipe walls of the pipe jacking pipes to carry out replacement and backfill after the pipe jacking pipes are communicated, meanwhile, the construction of an outer-wrapped tunnel door of the pipe jacking outlet pipes is completed, and the pipes after the rock pipe jacking machine is constructed are directly used as the water delivery pipes. The bottom elevation of the top pipe section 1a of the water delivery tunnel is about 60cm higher than the elevation of the main branch intersection 3, so that the requirement of a construction space is met.
And S3, excavating the construction branch holes 2 outside the protective area boundary 9 of the high-speed rail line 8 by adopting a drilling and blasting method until the main branch hole intersection port 3.
The whole construction branch tunnel 2 is positioned outside the boundary 9 of the protection area of the high-speed railway 8, an urban door opening type section is generally adopted, and during excavation, preliminary support measures such as concrete spraying protection, net hanging and anchor spraying, steel support and the like need to be adopted according to the type of surrounding rocks to ensure the construction safety. The elevation of the inlet section of the construction branch tunnel 2 should meet the flood control elevation requirement of the tunnel opening, and when the construction branch tunnel 2 is also used as a surge shaft, the elevation of the inlet section should be higher than the highest water level in the tunnel.
S4, after the top pipe section 1a of the water delivery tunnel is excavated to the main branch tunnel intersection port 3, the pipe jacking machine is withdrawn from the construction branch tunnel 2.
S5, ventilating and deslagging by using the construction branch tunnel 2, and excavating a drilling and blasting section 1b of the water delivery tunnel by adopting a drilling and blasting method.
While the water delivery tunnel drilling and blasting section 1b is excavated, preliminary bracing measures such as concrete spraying protection, net hanging and anchor spraying, steel support and the like are required to be taken according to the types of surrounding rocks so as to ensure the construction safety. The tail end of the water delivery tunnel drilling and blasting section 1b is a water receiving area river channel 7, and a construction branch hole 2 can be additionally arranged at the lower stream of the water delivery tunnel 1 according to needs.
S6, after the excavation of the water delivery tunnel drilling and blasting section 1b is completed, lining construction of the water delivery tunnel drilling and blasting section 1b, the main branch hole intersection port 3 and the construction branch hole 2 is carried out.
When the main branch tunnel intersection port 3 has temporary filling slag, after the lining of the water delivery tunnel drilling and blasting section 1b is completed, the temporary filling slag in the construction period of the main branch tunnel intersection port 3 needs to be removed, and then the lining construction of the main branch tunnel intersection port 3 and the construction branch tunnel 2 is sequentially carried out.
S7, the pipe-jacking working well 4 is transformed into a water inlet 10 of the water delivery tunnel.
After the water intake gate of the water inlet 10 is installed, the water is retained by descending the gate, and then the pipe-jacking working well 4 is transformed to be communicated with the river 5 of the water source region. According to the requirement of the total construction period, the water blocking weir 6 positioned at the downstream of the water inlet 10 on the river 5 of the water source region can be synchronously constructed when the water delivery tunnel 1 is excavated, or the water blocking weir 6 can be constructed after the water delivery tunnel 1 is excavated for a period of time.
In the technical scheme, when the whole water delivery tunnel 1 adopts pressure water delivery, the elevation of the main branch junction 3 is basically consistent with the bottom elevations of the top pipe section 1a and the drilling and blasting section 1b of the water delivery tunnel; when the water delivery tunnel 1 adopts a pressure water delivery scheme for the top pipe section 1a of the water delivery tunnel and a non-pressure water delivery scheme for the drilling and blasting section 1b of the water delivery tunnel, the elevation of the main branch hole intersection port 3 is basically consistent with that of the top pipe section 1a of the water delivery tunnel but is lower than that of the bottom of the drilling and blasting section 1b of the water delivery tunnel.
Because the maximum pipe diameter of the rock jacking pipe is about 4.0m, in order to increase the water delivery capacity, the design of a pressure pipeline is generally adopted, the jacking pipe section 1a of the water delivery tunnel can be arranged singly, or a plurality of jacking pipe sections can be arranged in parallel at intervals in a short distance, and the clear distance between different jacking pipes is not less than 1 time of the external diameter of the jacking pipe in principle.
If the top pipe section 1a of the water delivery tunnel adopts pressure water delivery and the drilling and blasting section 1b of the water delivery tunnel adopts a non-pressure water delivery scheme, after the pipe jacking machine is withdrawn, the outlet of the top pipe section 1a of the water delivery tunnel is temporarily sealed by adopting a steel plate, temporary backing slag constructed at the bottom of the main branch hole intersection port 3 is flush with the bottom of the drilling and blasting section 1b of the water delivery tunnel, and then the drilling and blasting method is adopted to excavate the drilling and blasting section of the water delivery tunnel.
If water delivery tunnel top pipe section 1a adopts to press the water delivery, water delivery tunnel bores and explodes section 1b and adopts the non-pressure water delivery scheme, 3 end elevations in the main tributary hole intersection mouth are less than water delivery tunnel bores and explodes section 1b end elevation, need to intersect 3 designs for narrow high shape section with the main tributary hole, and 3 tops in the main tributary hole intersection mouth and water delivery tunnel bore and explode section 1b tops and level basically.
The above embodiments are described in connection with the accompanying drawings, but the present invention is not limited thereto, and it should be noted that, for those skilled in the art, the technical solutions obtained by equivalent replacement or equivalent change without departing from the spirit of the present invention, and all of them belong to the protection scope of the present invention.
Claims (10)
1. A rock pipe jacking method and drilling and blasting method combined construction method for a water delivery tunnel is characterized in that: it comprises the following steps:
s1, constructing a pipe-jacking working well at the head of a pipe-jacking section of the water delivery tunnel and on one side of a river bank protection of a water source region;
s2, excavating a pipe jacking section of the water delivery tunnel, and jacking a rock pipe jacking machine from a pipe jacking working well to a main branch tunnel intersection;
s3, excavating construction branch holes outside the protection area of the high-speed rail line by adopting a drilling and blasting method until the intersection of the branch holes;
s4, after the top pipe section of the water delivery tunnel is excavated to the main branch junction, the pipe jacking machine withdraws from the construction branch;
s5, ventilating and deslagging by utilizing the construction branch tunnel, and excavating a drilling explosion section of the water delivery tunnel by adopting a drilling explosion method;
s6, after excavation of the drilling and blasting sections of the water delivery tunnel is completed, lining construction of the drilling and blasting sections of the water delivery tunnel, the main branch intersection and the construction branch tunnel is carried out;
s7, transforming the pipe-jacking working well into a water inlet of a water delivery tunnel.
2. The water delivery tunnel rock pipe jacking method and drilling and blasting method combined construction method according to claim 1, characterized in that: in the step S1, the pipe-jacking working well is of a reinforced concrete structure, the top elevation of the pipe-jacking working well needs to meet the flood control elevation requirement of the river in the water source area, and the bottom elevation of the pipe-jacking working well is lower than the top pipe section of the water delivery tunnel and higher than the bottom elevation of the river in the water source area, so as to avoid siltation.
3. The construction method of the water delivery tunnel by combining the rock pipe jacking method and the drilling and blasting method according to claim 1 is characterized in that: in the step S2, during jacking construction of the rock pipe jacking machine, a steel pipe and a PCCP pipe are adopted as pipe jacking pipes according to internal pressure of water delivery, thixotropic slurry is injected in the pipe wall friction force of the pipe jacking pipes in the pipe jacking construction process, cement mortar is directly injected between the pipes and a tunnel through grouting holes in the pipe wall of the pipe jacking pipes to carry out replacement and backfill after the pipe jacking pipes are communicated, meanwhile, construction of an outer-wrapped tunnel door of the pipe jacking outlet pipes is completed, and the pipes after construction of the rock pipe jacking machine are directly used as the water delivery pipes; the bottom elevation of the top pipe section of the water delivery tunnel is higher than the elevation of the intersection of the main branch tunnel, so that the requirement of a construction space is met.
4. The construction method of the water delivery tunnel by combining the rock pipe jacking method and the drilling and blasting method according to claim 1 is characterized in that: in the step S3, the whole construction branch tunnel is positioned outside the boundary of the protection area of the high-speed railway, an urban door opening type section is adopted, and concrete spraying protection, net hanging spraying anchor and steel support primary support measures are adopted according to the type of surrounding rocks during excavation so as to ensure the construction safety; the elevation of the inlet section of the construction branch tunnel meets the flood control elevation requirement of the tunnel opening, and when the construction branch tunnel is used as a surge shaft, the elevation of the inlet section of the construction branch tunnel is higher than the highest water level which can be reached in the tunnel.
5. The water delivery tunnel rock pipe jacking method and drilling and blasting method combined construction method according to claim 1, characterized in that: in the step S5, concrete spraying protection, net hanging spraying anchor and steel support primary support measures are adopted according to the types of surrounding rocks while the water delivery tunnel is excavated at the drilling and blasting section so as to ensure the construction safety; the tail end of the water delivery tunnel drilling and blasting section is a river channel of a water receiving area, and a construction branch tunnel is additionally arranged at the downstream of the water delivery tunnel according to needs.
6. The water delivery tunnel rock pipe jacking method and drilling and blasting method combined construction method according to claim 1, characterized in that: in step S6, when the main branch tunnel intersection has temporary filling slag, after the lining of the water delivery tunnel drilling and blasting section is completed, the temporary filling slag in the construction period of the main branch tunnel intersection is excavated, and then lining construction of the main branch tunnel intersection and the construction branch tunnel is sequentially performed.
7. The water delivery tunnel rock pipe jacking method and drilling and blasting method combined construction method according to claim 1, characterized in that: in step S7, after the water intake gate of the water inlet of the water delivery tunnel is installed, firstly, the water is retained by a lower gate, and then, the pipe-jacking working well is reformed to be communicated with a river channel of a water source region; according to the requirement of the total construction period, the water blocking weir is synchronously constructed during the excavation of the water conveying tunnel, or the water blocking weir is constructed after the water conveying tunnel is started for a period of time.
8. The construction method of the water delivery tunnel by combining the rock pipe jacking method and the drilling and blasting method according to claim 1 is characterized in that: when the whole water delivery tunnel adopts pressure water delivery, the elevation of the main branch intersection is consistent with the elevation of the top pipe section of the water delivery tunnel and the elevation of the bottom of the drilling and blasting section of the water delivery tunnel; when the water delivery tunnel adopts a pressure water delivery in the water delivery tunnel top pipe section and adopts a non-pressure water delivery scheme in the water delivery tunnel drilling explosion section, the elevation of the main branch hole intersection is basically consistent with that of the water delivery tunnel top pipe section but lower than the bottom elevation of the water delivery tunnel drilling explosion section.
9. The construction method of the water delivery tunnel by combining the rock pipe jacking method and the drilling and blasting method according to claim 1 is characterized in that: in order to increase the water delivery capacity, the pipes adopted by the rock pipe jacking machine are designed according to pressure pipelines, the top pipe section of the water delivery tunnel is arranged in a single way or a plurality of closely spaced parallel ways, and the clear distance between different top pipes is not less than 1 time of the outer diameter of the top pipe.
10. The construction method of the water delivery tunnel by combining the rock pipe jacking method and the drilling and blasting method according to claim 1 is characterized in that: when the pressure water delivery is adopted in the water delivery tunnel top pipe section and the non-pressure water delivery scheme is adopted in the water delivery tunnel drilling explosion section, the bottom elevation of the main branch hole intersection is lower than that of the water delivery tunnel drilling explosion section, the main branch hole intersection is a narrow and high section, and the top of the main branch hole intersection is flush with that of the water delivery tunnel drilling explosion section; after the pipe pushing machine is withdrawn, the outlet of the pipe pushing section of the water delivery tunnel is temporarily sealed by adopting a steel plate, and temporary cushion slag constructed at the bottom of the main branch junction is flush with the bottom of the drilling explosion section of the water delivery tunnel.
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