Water conservancy project composite water conveying pipe piece structure and construction method

Abstract

The invention relates to the technical field of underground structures of hydraulic engineering water conveyance projects, in particular to a hydraulic engineering composite water conveying pipe piece structure and a construction method. The structure comprises an outer lining layer, a connecting device, a cast-in-place reinforced concrete lining layer, a Z-shaped anchoring device and a monitoring device, wherein the outer lining layer is formed by a plurality of lining segments of a prefabricated assembled reinforced concrete structure; the connecting device is used for connecting adjacent lining segments; the Z-shaped anchoring device is used for connecting and anchoring two layers of lining structures; the construction method comprises the following steps: prefabricating the lining segments; splicing lining segments and installing a connecting device; bolt hole gaps are plugged through grouting; the second L-shaped anchoring part is connected with the pre-buried first L-shaped anchoring part through a sleeve; binding reinforcing steel bars of the lining layer and pouring concrete; and backfilling by grouting behind the wall and penetrating into the drill hole for secondary grouting to consolidate the surrounding rock and the broken body. The composite structure is simple, the overall stability is high, the construction efficiency is high, and an active feedback mechanism is achieved.

Description

Technical Field

[0001] This invention relates to the field of underground structure technology for water conservancy projects, and in particular to a composite water conveyance segment structure and construction method for water conservancy projects. Background Technology

[0002] Currently, in large and medium-sized water diversion, water supply and drainage tunnel projects using shield tunneling / TBM construction, water conveyance channels are mostly constructed by installing reinforced concrete segments, or a composite structure of "reinforced concrete segments + steel lining" is adopted. However, the existing technology still has the following prominent problems.

[0003] The direct tunneling method using single reinforced concrete segments refers to the simultaneous assembly of segments during shield / TBM excavation to form a water conveyance channel. Its limitations include: segments are typically connected via planar butt joints and bolts, relying on joint sealing. After several rings of segments are installed, backfilling and grouting are performed behind the wall. Under the pressure of grouting or groundwater, simple bolt connections are insufficient to effectively restrain the segments, easily leading to misalignment, deformation, and floating, severely affecting the stability and safety of the segment structure; misalignment and deformation increase hydraulic losses during water conveyance and increase the risk of joint leakage; bolt connections alone are insufficient to resist bending moments inside and outside the pipe wall, limiting the overall structural load-bearing capacity.

[0004] The reinforced concrete tunnel segment + steel lining composite method refers to assembling the tunnel segments during shield / TBM excavation and then installing the steel lining on the inside to form a water conveyance channel. The specific problems are as follows: the segment assembly stage also faces structural stability issues such as segment misalignment and floating due to grouting pressure or groundwater pressure; the steel lining can only be constructed after all the tunnel segments have been installed, which not only increases the project cost, but also significantly extends the overall construction period due to the transportation of the steel lining inside the tunnel and the connection of construction procedures.

[0005] Chinese Patent Publication No. CN112593973A discloses a composite lining structure for hydraulic tunnels and its manufacturing method. The method includes: splicing lining segments; installing a steel pipe lining inside the spliced ​​lining segments; spraying a self-growing material between the lining segments and the steel pipe lining; and pouring self-compacting concrete between the lining segments and the steel pipe lining. Specifically, before pouring the concrete, spraying the self-growing material between the lining segments and the steel pipe lining generates more cementitious material at the segment-concrete interface and the steel pipe-concrete interface, promoting bonding. Simultaneously, the material penetrates into the concrete, reacting with it at a certain depth to form a slurry that fills the surface gaps of the concrete, while also reinforcing the performance of the segments and the self-compacting concrete, thereby improving the mechanical properties of the interface. Therefore, the existing technology using reinforced concrete segments + steel lining composite methods suffers from problems such as complex composite structures, numerous procedures, low construction efficiency, high construction costs, weak overall integrity of the bonded sandwich structure, and the lack of an active feedback mechanism. Summary of the Invention

[0006] Therefore, the present invention provides a composite water conveyance pipe segment structure and construction method for water conservancy projects, in order to overcome the problems of complex composite structures, numerous procedures, low construction efficiency and high construction costs in the prior art, as well as the weak integrity of bonded sandwich structures and the lack of active feedback mechanisms.

[0007] To achieve the above objectives, in one aspect, the present invention provides a composite water conveyance segment structure for hydraulic engineering, comprising:

[0008] The outer lining layer includes several lining segments of a prefabricated reinforced concrete structure. Each lining segment is composed of 6 sections assembled together. Each section has a groove on one side for embedding an elastic pad and a rubber waterstop, and a tenon on the other side for anchoring with the groove.

[0009] A connecting device is installed between adjacent lining segments to connect adjacent lining segments;

[0010] The inner lining layer, which is located inside the outer lining layer, is a cast-in-place reinforced concrete structure.

[0011] Z-type anchoring device, which is set between each of the lining segments and the inner lining layer, includes a first L-type anchor embedded in the lining segment, a second L-type anchor installed during the construction of the inner lining layer, and a sleeve for connecting the first L-type anchor and the second L-type anchor.

[0012] The monitoring device is installed at the joint between two adjacent lining segments, including an inclination monitoring unit located at the contact surface between the lining segment and the inner lining layer to monitor the misalignment of the segments and a flow monitoring unit located on the water-facing side of the inner lining layer to monitor the flow velocity of the water.

[0013] Furthermore, the sleeve is connected to the first L-shaped anchor and pre-embedded in each of the lining segments;

[0014] Each of the lining segments is provided with a grouting hole, which is a one-sided blind hole;

[0015] The connecting device includes an arc-shaped connecting bolt with threads at both ends, and nuts and washers at both ends of the connecting bolt for fastening the lining segment and the connecting bolt.

[0016] The sleeve is also used to connect the connecting bolt to the second L-shaped anchor.

[0017] Furthermore, the connecting device also includes a grouting pipe joint that is fixedly connected to the gasket for grouting and filling the gap between the connecting bolt and the bolt hole;

[0018] The bolt holes are located at the ends of each lining segment used for splicing, and the bolt holes are provided with grouting pipe openings to communicate with the grouting pipe joints.

[0019] Furthermore, it also includes:

[0020] The communication judgment unit is connected to the monitoring device and is used to determine whether the segment misalignment data monitoring is triggered based on the received real-time water flow velocity, and to determine the segment misalignment monitoring range based on the dynamic change range of the real-time water flow velocity.

[0021] The misalignment monitoring unit, which is connected to the communication judgment unit, is used to obtain misalignment data of the water supply pipe segments to judge the structural status of the water supply pipe segments, and to judge whether to adjust the misalignment monitoring range of the pipe segments based on the correlation between the misalignment data of the pipe segments and the misalignment monitoring range of the pipe segments.

[0022] Furthermore, the communication judgment unit is also used to obtain historical segment misalignment data to calculate the structural fatigue coefficient of a single misalignment location, calculate the bidirectional impact increment based on historical water flow velocity change data, and calculate the misalignment control coefficient based on the cumulative impact load and the bidirectional impact increment.

[0023] Furthermore, the communication judgment unit is also used to adjust the monitoring water level threshold based on the misalignment control coefficient, so as to adjust the timing of monitoring the misalignment data of the pipe segments.

[0024] On the other hand, the present invention also provides a construction method for the above-mentioned composite water conveyance segment structure in water conservancy projects, comprising:

[0025] Step S1: Prefabricate several lining segments and pre-embed the first L-shaped anchor;

[0026] Step S2: Install the rubber waterstop and elastic pad;

[0027] Step S3: Transport the lining segments equipped with rubber waterstops and elastic pads to the working position of the shield tunneling machine inside the tunnel.

[0028] Step S4: Assemble each lining segment using an assembly machine and install it using a connecting device;

[0029] Step S5: Grout the gap between the bolt holes through the grouting pipe opening and seal the holes;

[0030] Step S6: Tighten the second L-shaped anchor to the first L-shaped anchor and the connecting bolt using a sleeve.

[0031] Step S7: Install the tilt monitoring unit and connect it to the outside signal; carry out the reinforcement binding operation of the inner lining layer and pour concrete using the tunnel formwork trolley; after the pouring is completed, install the flow monitoring unit and connect it to the outside signal.

[0032] Step S8: Fine stone concrete is injected through the preset grouting holes to fill the gap between the outer arc surface of the lining segment and the soil and rock mass. The injected grout consolidates the surrounding rock layer and the broken body around the lining segment and seals the grouting holes.

[0033] Further, step S1 includes:

[0034] Step S11: Tie the double-layer steel mesh;

[0035] Step S12: Pre-embed the first L-shaped anchor and connect the sleeve to it. Use a wooden plug to seal the exposed threaded end of the sleeve to prevent the threads from being contaminated by concrete slurry.

[0036] Step S13: Pour concrete, cure it for the required period of time, and then transport it to the construction site.

[0037] Further, step S4 includes:

[0038] Step S41: The assembly machine picks up a certain segment and places it in the designated position;

[0039] Step S42: Install the connecting bolts, washers and nuts in sequence and tighten the nuts to connect the two adjacent sections;

[0040] Step S43: The assembly machine releases the current segment and grabs the next segment, and repeats steps S41-S42 until the current ring segment is assembled.

[0041] Further, step S8 includes:

[0042] Step S81: Open up the pre-set grouting holes that are not fully penetrated.

[0043] Step S82: Connect the grouting pipeline to the opened grouting hole and pour fine aggregate concrete.

[0044] Step S83: After the fine aggregate concrete is poured, a second deep drilling grouting is performed to consolidate the surrounding rock layer and fractured body. Fine aggregate concrete is then poured into the remaining grouting holes in the current ring in a bottom-up, symmetrical pouring order.

[0045] Compared with the prior art, the beneficial effect of the present invention is that the present invention achieves streamlined construction by using a simple composite structure design of prefabricated lining segments and cast-in-place inner lining layer and combining it with a tunnel formwork trolley, thus breaking through the limitation that the traditional inner lining layer can only be carried out after the initial support of the tunnel is completed.

[0046] Furthermore, the present invention, through the ingenious design of arc-shaped connecting bolts and Z-shaped anchoring devices, can effectively resist the external bending moment from the soil and rock layers borne by the lining segments, significantly enhance the connection and anchoring mechanical properties between the inner and outer structural layers, further improve the anchoring strength and load transfer efficiency, and improve the stability of the composite water conveyance segment structure.

[0047] Furthermore, this invention features an integrated figure-eight grouting bolt hole design, with one hole for bolt installation and the other serving as a grouting channel; the gasket is equipped with a grouting pipe opening, which can completely seal the hole after grouting, effectively isolating corrosive media, fundamentally preventing bolt corrosion, and extending the service life of the anchoring system.

[0048] Furthermore, this invention utilizes a monitoring device to collect real-time front-end data on the water flow velocity in the water conveyance tunnel and a concealed segment misalignment monitoring system; through a communication judgment unit and a misalignment monitoring unit, the invention achieves dynamic monitoring of the tunnel structure and water conveyance status and autonomous adjustment of monitoring actions.

[0049] Furthermore, this invention achieves visualization of the safety factor and water conveyance efficiency of the tunnel structure through dynamic monitoring of the water conveyance tunnel. It can accurately determine the structural status and water conveyance efficiency of the tunnel, and can predict in advance the potential for structural damage to avoid greater economic losses. Attached Figure Description

[0050] Figure 1 This is a circumferential cross-section of the composite water conveyance pipe segment structure in a water conservancy project according to an embodiment of the present invention. Figure 1 ;

[0051] Figure 2 This is a circumferential cross-section of the composite water conveyance pipe segment structure in a water conservancy project according to an embodiment of the present invention. Figure 2 ;

[0052] Figure 3 This is an axial cross-sectional view of the composite water conveyance pipe segment structure in a water conservancy project according to an embodiment of the present invention;

[0053] Figure 4 This is a detailed drawing of the inner ring joint of the composite water conveyance pipe segment structure in a water conservancy project according to an embodiment of the present invention;

[0054] Figure 5 This is a detailed view of the ring joint of the composite water conveyance pipe segment structure in a water conservancy project according to an embodiment of the present invention;

[0055] Figure 6 This is a detailed drawing of the figure-eight integrated grouting bolt hole and its pad in the composite water conveyance pipe segment structure of the water conservancy project according to an embodiment of the present invention;

[0056] In the figure, 1-lining segment; 11-grouting hole; 12-groove; 13-tenon; 2-connecting device; 21-connecting bolt; 22-nut; 23-washer; 231-grouting pipe joint; 24-grouting pipe orifice; 25-handhole; 251-bolt hole; 3-inner lining layer; 4-Z-type anchoring device; 41-first L-type anchor; 42-second L-type anchor; 43-sleeve; 5-monitoring device; 51-tilt monitoring unit; 52-flow monitoring unit. Detailed Implementation

[0057] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0058] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0059] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0060] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] Please see Figures 1-5 As shown, it is a circumferential cross-section of the composite water conveyance segment structure in a water conservancy project according to an embodiment of the present invention. Figure 1 Circumferential cross-section of the composite water conveyance pipe segment structure in the water conservancy project according to an embodiment of the present invention. Figure 2 The present invention includes: an axial cross-sectional view of the composite water conveyance pipe segment structure in a water conservancy project according to an embodiment of the present invention; a detailed view of the inner ring joint of the composite water conveyance pipe segment structure in a water conservancy project according to an embodiment of the present invention; and a detailed view of the ring-to-ring joint of the composite water conveyance pipe segment structure in a water conservancy project according to an embodiment of the present invention.

[0062] The outer lining layer includes several lining segments 1 of prefabricated reinforced concrete structure. Each lining segment 1 is composed of 6 blocks assembled in sequence. Each block has a groove 12 on one side for embedding the elastic pad and rubber waterstop, and a tenon 13 on the other side for anchoring with the groove 12.

[0063] The connecting device 2 is disposed between adjacent lining segments 1 to connect adjacent lining segments 1;

[0064] The inner lining layer 3 is located inside the outer lining layer and is an integrally cast reinforced concrete structure.

[0065] Z-type anchoring device 4 is installed between each lining segment 1 and the inner lining layer 3, including a first L-type anchor 41 pre-embedded on the lining segment 1, a second L-type anchor 42 installed during the construction of the inner lining layer 3, and a sleeve 43 for connecting the first L-type anchor and the second L-type anchor.

[0066] It should be noted that, Figure 1 , Figure 2 and Figure 3 The Z-type anchoring device 4 shown is for illustrative purposes only. For ease of understanding, it is represented by the same Z-shape in both the circumferential and axial cross-sectional views. In reality, the Z-type anchoring device 4 is Z-shaped in the circumferential cross-sectional view and I-shaped in the axial cross-sectional view.

[0067] Specifically, the sleeve 43 is connected to the first L-shaped anchor 41 and pre-embedded in each lining segment 1;

[0068] Each lining segment 1 is provided with a grouting hole 11, which is a blind hole on one side;

[0069] Preferably, in this embodiment, the first L-shaped anchor 41 is arranged circumferentially on the center line of each lining segment 1, and two first L-shaped anchors 41 are pre-embedded in the capping block, and three first L-shaped anchors 41 are pre-embedded in each of the five sub-blocks. The first L-shaped anchors 41 at both ends of the circumferential direction on each lining segment 1 are 20cm away from the edge of the segment, and the first L-shaped anchors 41 are arranged at equal intervals and avoid the grouting holes 11.

[0070] The connecting device 2 includes an arc-shaped connecting bolt 21 with threads at both ends, and nuts 22 and washers 23 provided at both ends of the connecting bolt 21 for fastening the lining tube segment 1 and the connecting bolt 21.

[0071] Sleeve 43 is also used to connect bolt 21 to second L-shaped anchor 42.

[0072] It should also be noted that the connecting device 2 is used to connect two adjacent lining segments 1 circumferentially inside each ring segment, and to connect two axially adjacent ring segments. Both ends of all the connecting devices 2 are connected to the second L-shaped anchor 42 through the sleeve 43. Therefore, the connecting devices 2 that have been connected to the second L-shaped anchor 42 show the same shape in the circumferential section view and the axial section view.

[0073] In one specific embodiment, the lining segment 1 comprises 6 blocks including 3 standard blocks, 2 adjacent blocks and 1 capping block. Among them, the 5 blocks other than the capping block are provided with grouting holes 11 that are not fully penetrated for backfilling and consolidation behind the wall of the lining segment 1. Specifically, in the formed water conveyance tunnel, the grouting holes 11 are located at 0°, -45°, 45°, -135° and 135° respectively, that is, the top, upper left, upper right, lower left and lower right.

[0074] It is understandable that the construction machinery for water conveyance tunnels is mostly shield tunneling machines. The outer diameter of the lining segment 1 is smaller than the excavation radius of the shield tunneling machine and smaller than the outer diameter of the shield body to ensure that the lining segment 1 can be assembled inside the shield body. Since the excavation face is larger than the cross-section of the lining segment 1, an annular cavity to be filled will be formed between the outer wall of the lining segment 1 and the excavated rock and soil. In addition, the lining segment 1 will float due to the buoyancy of groundwater. Therefore, grouting holes 11 are not set at the bottom.

[0075] In another embodiment of this example, more than one grouting hole 11 may be reserved for the three standard blocks and the two adjacent blocks. Preferably, three grouting holes 11 are reserved at equal intervals for the five sub-blocks other than the capping block so as to fill the annular cavity with fine stone concrete or other types of filler through the grouting holes 11 to stabilize the lining segment 1 and the soil and rock mass.

[0076] It is understandable that in the field of shield tunneling and segment assembly construction, there are two assembly methods for lining segments 1: continuous joint and staggered joint. The staggered joint assembly method is more common because it results in more uniform structural stress and higher stability. That is, the position of the capping block of each ring of lining segments 1 is not fixed. The capping block has the smallest arc length and is the weakest link in each ring of lining segments 1. In order to minimize the external pressure on the capping block, except in special cases, the capping block is usually not set at the top (0°) and bottom (180°) positions. Each segment is pre-set with multiple grouting holes 11 to ensure that there are usable grouting holes 11 at all 5 angular positions in the embodiment when the capping block is in different assembly positions.

[0077] Please see Figure 5 and Figure 6 Specifically, the connecting device 2 also includes a grouting pipe joint 231 that is fixedly connected to the gasket 23 for grouting to fill the gap between the connecting bolt 21 and the bolt hole 251;

[0078] Bolt holes 251 are provided at the ends of each lining segment 1 for splicing, and grouting pipe openings 24 are provided on the bolt holes 251 to communicate with grouting pipe joints 231.

[0079] In this embodiment, the connecting bolt 21 and the washer 23 are installed through the handhole 25 located at the corresponding position on the inner arc surface of the lining segment 1; the bolt hole 251 is an 8-shaped integrated grouting bolt hole 251, that is, the end of the bolt hole 251 near the inner arc surface of the lining segment 1 has a double hole design, wherein the hole near the adjacent lining segment 1 is the bolt hole 251 used to accommodate the connecting bolt, and the hole away from the adjacent lining segment 1 is the grouting pipe opening 24 used to accommodate the grouting pipe joint 231 and serve as a grouting channel.

[0080] The monitoring device 5 is installed at the joint between two adjacent ring lining segments 1, including an inclination monitoring unit 51 located at the contact surface between the lining segment 1 and the inner lining layer 3 to monitor the misalignment of the segments and a flow monitoring unit 52 located on the water-facing surface of the inner lining layer 3 to monitor the flow velocity of the water.

[0081] In this embodiment, the flow monitoring unit 52 can be an electromagnetic flow meter or probe suitable for monitoring water flow velocity in water conveyance tunnels, and the tilt monitoring unit 51 can be an inclinometer or tilt meter capable of monitoring changes in segment misalignment. Since the lining segment 1 is a modular structure that can be assembled, misalignment may occur between every two adjacent segments, but the misalignment at the bottom has the greatest impact on water flow velocity. Therefore, preferably, the tilt monitoring unit 51 is only set at the bottom joint of two adjacent rings of lining segment 1, and the flow monitoring unit 52 is set at intervals or only in key sections, such as sections with weak strata or abundant groundwater, to detect weak locations.

[0082] Specifically, the composite water supply pipe segment structure of this embodiment of the invention further includes:

[0083] The communication judgment unit is connected to the monitoring device 5 and is used to determine whether the segment misalignment data monitoring is triggered based on the received real-time water flow velocity, and to determine the segment misalignment monitoring range based on the dynamic change range of the real-time water flow velocity.

[0084] The misalignment monitoring unit, connected to the communication judgment unit, is used to obtain misalignment data of the water transmission pipe segments to judge the structural status of the segments, and to judge whether to adjust the misalignment monitoring range of the segments based on the correlation between the misalignment data and the misalignment monitoring range.

[0085] In this embodiment, several flow monitoring units 52 within the water conveyance tunnel monitor the water flow velocity in real time, and the data is synchronously received by a communication judgment unit. The communication judgment unit generates a flow velocity curve for each flow monitoring unit 52 in a time sequence. Based on the curvature characteristics of the flow velocity curves corresponding to flow monitoring units 52 at different locations, the tunnel segment structure is judged. Preferably, a flow velocity deviation of 10% or more is defined as abnormal flow velocity, and a flow velocity deviation of less than 10% is defined as normal flow velocity.

[0086] If the flow velocity is abnormal only at a certain monitoring point, while the upstream and downstream monitoring points are normal, it is determined that there is misalignment of the pipe segments near that point, causing water blockage. The tilt angle monitoring unit 51 within 100m of that point is actively triggered to monitor the misalignment of each pipe segment.

[0087] If the flow velocity at all monitoring points is synchronously abnormal, it is determined to be a global factor such as pump station regulation or valve operation, and the segment status is judged to be normal, and no tilt angle monitoring unit 51 is triggered;

[0088] If the velocity difference between upstream and downstream monitoring points gradually increases, that is, if the velocity difference between adjacent upstream and downstream monitoring points increases and the velocity difference reaches 10% or more of the initial velocity difference, such as if the velocity difference between adjacent monitoring points reaches 0.5 m / s, it is determined that the misalignment of the pipe segment or the number of pipe segments with misalignment is increasing, and all tilt angle monitoring units 51 are actively triggered to monitor the misalignment of each pipe segment.

[0089] When the communication judgment unit triggers the tilt monitoring unit 51 to perform misalignment monitoring, the misalignment supervision unit actively acquires the tilt data of all triggered tilt monitoring units 51 and automatically calculates and converts the tilt value into a misalignment value. When the misalignment value of the segment is greater than or equal to the misalignment threshold, it is determined that the segment has caused uneven settlement or uplift and is marked as an abnormal segment. Preferably, the misalignment threshold is set to 3mm. When the misalignment value of the segment is less than the misalignment threshold, it is determined that the segment at that location is in normal condition and is not related to the segment misalignment monitoring range. A stop working control signal is sent to the tilt monitoring unit 51 at that location. In addition, all tilt monitoring units 51 within 10% of the original monitoring range centered on the segment at that location are stopped monitoring. For example, if the original monitoring range is 100m, and there is a segment in this area corresponding to a tilt monitoring unit that is in normal condition and is not related to the segment misalignment monitoring range, then the segment corresponding to the tilt monitoring unit is taken as the center, and the corresponding tilt monitoring units within 5m on both sides of the center are stopped and no longer monitored for misalignment. It is understandable that the misalignment value can be calculated using geometric data based on the tilt angle data from the tilt angle monitoring unit 51, which is existing technology and will not be elaborated here.

[0090] Specifically, the communication judgment unit is also used to obtain historical segment misalignment data to calculate the structural fatigue coefficient of a single misalignment location, calculate the bidirectional impact increment based on historical water flow velocity change data, and calculate the misalignment control coefficient based on the cumulative impact load and the bidirectional impact increment.

[0091] Specifically, the communication judgment unit is also used to adjust the monitoring water level threshold based on the calculated misalignment control coefficient, so as to adjust the timing of monitoring the misalignment data of the pipe segments.

[0092] In this embodiment, the communication judgment unit acquires the current time point and a total of 50 misalignment data points, and calculates the structural fatigue coefficient of a single misalignment location based on the misalignment data. Let D represent the structural fatigue coefficient, which is... , where Δh i The misalignment value recorded for the i-th time is expressed in mm or H. lim The maximum allowable cumulative misalignment of the tunnel segment is expressed in mm and is determined by design specifications or material fatigue tests. In this embodiment, it is 3 mm, and n is the total number of time cycles, i.e., n=50.

[0093] The communication judgment unit acquires the current time point and a total of 50 previous water flow velocities, filters the two adjacent historical data with the largest water flow velocity difference, and calculates the bidirectional impact increment based on the water flow velocity change characteristics. Let S represent the bidirectional impact increment, with the unit being Pa. Where ρ is the fluid density, which is set to clean water in this embodiment, i.e., ρ=1000kg / m³, α is the water hammer wave velocity, which is taken as α=1000m / s for clean water, and ∆V is the velocity difference.

[0094] Let k represent the misalignment control coefficient, which is... Where β is the empirical reference value for bidirectional impact increment, and β = 500000 Pa;

[0095] When k < 1, it indicates that the misalignment is within a safe range and its impact on the water flow velocity is less than 10%. The existing monitoring water level threshold remains unchanged. In this embodiment, the monitoring water level threshold is set to 80% of the tunnel inner diameter.

[0096] When k≥1, it indicates that the misalignment is at the safety threshold or has exceeded the limit, which has a significant negative impact on the water flow velocity. The original monitoring water level threshold is reduced by 20%, that is, adjusted to 64% of the tunnel inner diameter.

[0097] At this point, after adjusting the monitoring water level threshold, the adjusted monitoring water level threshold can be used to re-determine whether the misalignment monitoring is triggered, thus realizing the adjustment of the timing of the segment misalignment data monitoring by adjusting the monitoring water level threshold.

[0098] In this embodiment, the communication judgment unit and the misalignment monitoring unit can be, but are not limited to, a combination of industrial monitoring software and acquisition modules. These are technical means that can be fully implemented by existing technologies, and will not be limited or elaborated here.

[0099] This invention also provides a construction method for the composite water conveyance segment structure applied to the above-mentioned water conservancy project, comprising:

[0100] Step S1: Prefabricate several lining segments 1 and pre-embed the first L-shaped anchor 41;

[0101] Step S2: Install the rubber waterstop and elastic pad;

[0102] Step S3: Transport the lining segment 1 equipped with rubber waterstop and elastic pad to the working position of the shield tunneling machine inside the tunnel.

[0103] Step S4: Assemble each lining segment 1 using an assembly machine and install it using a connecting device 2;

[0104] Step S5: Grout the gap between the bolt holes through the grouting pipe orifice 24 and seal the holes;

[0105] Step S6: Tighten the second L-shaped anchor 42 to the first L-shaped anchor 41 and the connecting bolt 21 using the sleeve 43.

[0106] Step S7: Install the tilt monitoring unit 51 and connect it to the outside signal; carry out the steel reinforcement binding operation of the inner lining layer 3 and pour concrete using the tunnel formwork trolley; after the pouring is completed, install the flow monitoring unit 52 and connect it to the outside signal.

[0107] Step S8: Fine stone concrete is injected through the preset grouting hole 11 to fill the gap between the outer arc surface of the lining segment 1 and the soil and rock mass. The injected grout consolidates the surrounding rock layer and the broken body around the lining segment 1 and seals the grouting hole.

[0108] Specifically, step S1 includes:

[0109] Step S11: Tie the double-layer steel mesh;

[0110] Step S12: Pre-embed the first L-shaped anchor 41 and connect the sleeve 43 to it. Use a wooden plug to seal the exposed threaded end of the sleeve 43 to prevent the threads from being contaminated by concrete slurry.

[0111] Step S13: Pour concrete, cure it for the required period of time, and then transport it to the construction site.

[0112] Specifically, step S4 includes:

[0113] Step S41: The assembly machine picks up a certain segment and places it in the designated position;

[0114] Step S42: Install the connecting bolt 21, washer 23 and nut 22 in sequence and tighten the nut 22 to connect the two adjacent blocks;

[0115] Step S43: The assembly machine releases the current segment and grabs the next segment, and repeats steps S41-S42 until the current ring segment is assembled.

[0116] Specifically, step S8 includes:

[0117] Step S81: Open up the pre-set, incompletely penetrated grouting hole 11;

[0118] Step S82: Connect the grouting pipeline to the opened grouting hole 11 and pour fine aggregate concrete.

[0119] Step S83: After the fine aggregate concrete is poured, a second deep drilling grouting is performed to consolidate the surrounding rock layer and fractured body. Fine aggregate concrete is poured into the remaining grouting holes 11 in the current ring in a bottom-up, symmetrical pouring order.

[0120] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A composite water conveyance segment structure for hydraulic engineering, characterized in that, include: The outer lining layer includes several lining segments of a prefabricated reinforced concrete structure. Each lining segment is composed of 6 sections assembled together. Each section has a groove on one side for embedding an elastic pad and a rubber waterstop, and a tenon on the other side for anchoring with the groove. A connecting device is installed between adjacent lining segments to connect adjacent lining segments; The inner lining layer, which is located inside the outer lining layer, is a cast-in-place reinforced concrete structure. Z-type anchoring device, which is set between each of the lining segments and the inner lining layer, includes a first L-type anchor embedded in the lining segment, a second L-type anchor installed during the construction of the inner lining layer, and a sleeve for connecting the first L-type anchor and the second L-type anchor. The monitoring device is installed at the joint between two adjacent lining segments, including an inclination monitoring unit located at the contact surface between the lining segment and the inner lining layer to monitor the misalignment of the segments and a flow monitoring unit located on the water-facing side of the inner lining layer to monitor the flow velocity of the water.

2. The composite water conveyance pipe segment structure for water conservancy projects according to claim 1, characterized in that, The sleeve is connected to the first L-shaped anchor and is pre-embedded on each of the lining segments; Each of the lining segments is provided with a grouting hole, which is a one-sided blind hole; The connecting device includes an arc-shaped connecting bolt with threads at both ends, and nuts and washers at both ends of the connecting bolt for fastening the lining segment and the connecting bolt. The sleeve is also used to connect the connecting bolt to the second L-shaped anchor.

3. The composite water conveyance pipe segment structure for water conservancy projects according to claim 2, characterized in that, The connecting device also includes a grouting pipe joint that is fixedly connected to the gasket for grouting and filling the gap between the connecting bolt and the bolt hole; The bolt holes are located at the ends of each lining segment used for splicing, and the bolt holes are provided with grouting pipe openings to communicate with the grouting pipe joints.

4. The composite water conveyance pipe segment structure for water conservancy projects according to claim 3, characterized in that, Also includes: The communication judgment unit is connected to the monitoring device and is used to determine whether the segment misalignment data monitoring is triggered based on the received real-time water flow velocity, and to determine the segment misalignment monitoring range based on the dynamic change range of the real-time water flow velocity. The misalignment monitoring unit, which is connected to the communication judgment unit, is used to obtain misalignment data of the water supply pipe segments to judge the structural status of the water supply pipe segments, and to judge whether to adjust the misalignment monitoring range of the pipe segments based on the correlation between the misalignment data of the pipe segments and the misalignment monitoring range of the pipe segments.

5. The composite water conveyance segment structure for water conservancy projects according to claim 4, characterized in that, The communication judgment unit is also used to obtain historical segment misalignment data to calculate the structural fatigue coefficient of a single misalignment location, calculate the bidirectional impact increment based on historical water flow velocity change data, and calculate the misalignment control coefficient based on the cumulative impact load and the bidirectional impact increment.

6. The composite water conveyance segment structure for water conservancy projects according to claim 5, characterized in that, The communication judgment unit is also used to adjust the monitoring water level threshold based on the misalignment control coefficient, so as to adjust the timing of monitoring the misalignment data of the pipe segments.

7. A construction method for a composite water conveyance segment structure used in any one of claims 1-6 in a water conservancy project, characterized in that, include: Step S1: Prefabricate several lining segments and pre-embed the first L-shaped anchor; Step S2: Install the rubber waterstop and elastic pad; Step S3: Transport the lining segments equipped with rubber waterstops and elastic pads to the working position of the shield tunneling machine inside the tunnel. Step S4: Assemble each lining segment using an assembly machine and install it using a connecting device; Step S5: Grout the gap between the bolt holes through the grouting pipe opening and seal the holes; Step S6: Tighten the second L-shaped anchor to the first L-shaped anchor and the connecting bolt using a sleeve. Step S7: Install the tilt monitoring unit and connect it to the outside signal; carry out the reinforcement binding operation of the inner lining layer and pour concrete using the tunnel formwork trolley; after the pouring is completed, install the flow monitoring unit and connect it to the outside signal. Step S8: Fine stone concrete is injected through the preset grouting holes to fill the gap between the outer arc surface of the lining segment and the soil and rock mass. The injected grout consolidates the surrounding rock layer and the broken body around the lining segment and seals the grouting holes.

8. The construction method of the composite water conveyance segment structure for water conservancy projects according to claim 7, characterized in that, Step S1 includes: Step S11: Tie the double-layer steel mesh; Step S12: Pre-embed the first L-shaped anchor and connect the sleeve to it. Use a wooden plug to seal the exposed threaded end of the sleeve to prevent the threads from being contaminated by concrete slurry. Step S13: Pour concrete, cure it for the required period of time, and then transport it to the construction site.

9. The construction method of the composite water conveyance segment structure for water conservancy projects according to claim 7, characterized in that, Step S4 includes: Step S41: The assembly machine picks up a certain segment and places it in the designated position; Step S42: Install the connecting bolts, washers and nuts in sequence and tighten the nuts to connect the two adjacent sections; Step S43: The assembly machine releases the current segment and grabs the next segment, and repeats steps S41-S42 until the current ring segment is assembled.

10. The construction method of the composite water conveyance segment structure for water conservancy projects according to claim 7, characterized in that, Step S8 includes: Step S81: Open up the pre-set grouting holes that are not fully penetrated. Step S82: Connect the grouting pipeline to the opened grouting hole and pour fine aggregate concrete. Step S83: After the fine aggregate concrete is poured, a second deep drilling grouting is performed to consolidate the surrounding rock layer and fractured body. Fine aggregate concrete is then poured into the remaining grouting holes in the current ring in a bottom-up, symmetrical pouring order.

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