Assembled debris flow comprehensive sand-blocking dam system and construction method

Abstract

The present invention discloses an assembled debris flow comprehensive sand retaining dam system and construction method. The foundation of the system is cast on site, and the remaining parts are assembled; the pen-shaped foundation is the stable skeleton of the system, providing an assembly connection base; the barrier assembly is composed of a lower gravity wall and an upper grille wall, which can be flexibly designed; the guardrail includes a guardrail in front of the dam and a guardrail behind the dam, which is a brick paving layer covering the ditch bed, and adjacent brick paving parts are positioned and interlocked, and the guardrail in front of the dam is in an ascending step type; the diversion wall is a wall body built with staggered seams of bricks; the wing wall is a layered splicing of wing wall panels, one panel per layer, and positioned and interlocked up and down; the connecting fasteners include prestressed through-threaded steel bars connecting the pier row and the barrier, as well as through-steel bars, non-through-steel bars, and anchor rods in the remaining parts. The present invention realizes comprehensive protection of ditches, ditch beds, and bank slopes, and is a complete assembled concrete sand retaining dam solution. By utilizing the new main dam body structure, the effective range of technical elements for dam design and transformation is expanded, so that the system can adapt to the debris flow prevention and control goals for a long time.

Description

Technical Field

[0001] The invention relates to a debris flow sand-blocking dam, in particular to an assembled debris flow permeable sand-blocking dam system with comprehensive functions, belonging to the technical field of water conservancy projects and debris flow interception and drainage prevention and control projects in channels. Background Art

[0002] In the construction of geological disaster prevention and control projects in mountainous areas, sand-blocking dams are currently the most important and most commonly used type of projects because of their functions of intercepting solid matter from debris flows, reducing the velocity of debris flows, stabilizing the source of ditch beds, and their mature design and construction technologies.

[0003] In the early days, the sand-blocking dam was completed by all-on-site pouring or masonry construction. With the development of construction technology, the concept of assembly and combination was introduced. Existing technology ZL 2012100305119 provides a semi-assembled ecological debris flow sand-blocking dam, including a dam foundation and a dam body on it, the dam body including a debris flow overflow section and dam shoulders on both sides; the debris flow overflow section is a mortar masonry or concrete or reinforced concrete structure, and the dam shoulder adopts an assembled structure, specifically composed of a number of prefabricated reinforced concrete rectangular boxes connected vertically and horizontally, the top surface of the rectangular box is open, the other five sides are closed, the interior is filled with soil, and the surface of the soil not covered by the upper box is planted with shrubs or grass. Prior art ZL 2018107644597 provides a debris flow sand dam with natural dredging, including a main dam body and an anti-scouring auxiliary structure located on the back side of the main dam body. The main dam body is composed of non-overflow sections on the left and right sides and an overflow section in the middle. The non-overflow section is formed in one piece by concrete pouring, and the overflow section adopts an assembled dam body structure. When dredging, first calculate the proportion of deposits in the reservoir area that can be washed away to determine the scale of dredging; dismantle the corresponding number of prefabricated components according to the scale of dredging, then excavate a flow channel in the reservoir area, and then use the mountain torrents during the interval period of debris flow to quickly flush the sediment in the reservoir area for natural dredging, and reinstall the disassembled prefabricated components after the dredging is completed. Both prior arts introduce the concept of prefabricated assembly in the sand dam structure, but are limited to local structures: the former adopts an assembled dam shoulder, and the latter adopts an assembled dam body overflow section. In addition, the rest of the parts are still cast on site or masonry.

[0004] The main shortcomings of the existing combined assembled sand dam are: first, the prefabricated assembly part accounts for a small proportion of the overall project volume, and the advantages of the assembled concrete structure are limited. Second, due to the limited advantages of the assembled concrete structure, there is no substantial adjustment to the structure and interception and drainage functions of the traditional sand dam. In the core dam body part of the sand dam, the structure is still in the form of three sections: dam shoulder-overflow section-dam shoulder, and the interception and drainage function is still achieved by combining the solid part with the overflow port and drainage hole. This further means that in the design of the core dam body structure, the structural variables that can be used are limited, and the goal of planning the prevention and control function according to local conditions for special channel environments may also be limited. Third, due to the existence of the first two deficiencies, similar to conventional debris flow sand dam projects, once the sand dam project is built, the debris flow prevention and control function of the dam body is fixed at the time of commissioning, and no adaptive adjustment can be made to the structure or function during its service. Even when the prevention and control goals change significantly, the original design can only provide environmental governance functions. Summary of the invention

[0005] The purpose of the present invention is to provide an assembled debris flow sand dam system with comprehensive prevention and control functions, and a construction method thereof, in view of the deficiencies in the prior art.

[0006] The present invention first provides an assembled debris flow comprehensive sand-blocking dam system, and its technical solution is as follows.

[0007] An assembled debris flow comprehensive sand-blocking dam system:

[0008] It includes a foundation part, a drainage part, a tank guard part, a diversion wall part, a wing wall part, and connecting fasteners. The foundation part is cast on site at the dam site, and the remaining parts are prefabricated structures, which are assembled, connected and fastened with the foundation part;

[0009] The foundation part is of a pen-shaped shape, with the lower part being a foundation beam across the channel direction y, and the upper part being a single row of piers perpendicular to the foundation beam, the pier column being composed of piers arranged at a spacing, and the piers at both ends of the pier column being end piers; in the channel direction x, the width of the foundation beam is w 11 Greater than the pier width w 12 ;

[0010] The barrier section is a barrier wall fixed between the piers, and a barrier combination is formed between adjacent piers, including a lower gravity wall and an upper grid wall;

[0011] The apron is a paving layer of bricks covering the ditch bed. Adjacent bricks are connected and fixed by a positioning interlocking mechanism on the connecting surface. The apron includes a front apron and a rear apron, which are respectively connected to the upstream and downstream sides of the pier row on the foundation beam. In the cross-ditch direction y, the length of the front apron is l31 Or the length of the dam backguard l 32 Not greater than the length of the foundation beam l 11 ;

[0012] The diversion wall part includes two diversion walls on the left and right, and the diversion wall is a wall body built with staggered joints of bricks, connecting the flow-facing surface of the end pier and the apron in front of the dam;

[0013] The wing wall part includes two left and right wing walls, which are walls made of wing wall panels spliced ​​in layers, connecting the back flow surface of the end pier and the rear guard tank of the dam. Each layer of the wing wall is a wing wall panel, and the upper and lower wing wall panels are connected and fixed by a positioning interlocking mechanism on the connection surface;

[0014] The connecting fasteners connect and fasten the connecting points of the various parts of the comprehensive sand retaining dam system.

[0015] The above-mentioned assembled debris flow comprehensive sand-control dam system is an assembled integral concrete structure. By combining the characteristic analysis of the impact movement of debris flow on the sand-control dam, as well as the force and response characteristics of each part of the sand-control dam, the foundation and piers of the middle dam body of the comprehensive sand-control dam system of the present invention are designed to be cast on site as a whole, to ensure the anti-slip and anti-overturning stability of the dam body when it is impacted by debris flow. The foundation part cast on site as a whole also serves as the skeleton of the sand-control dam system, providing a connection and intersection platform for each assembled structure, so that the upstream and downstream parts and the left and right bank parts around the dam body can intersect on the skeleton, forming an overall balanced system of force and force transmission.

[0016] The assembled debris flow integrated sand retaining dam system of the present invention, in addition to the above-mentioned comprehensive protection functions, also has the characteristic of adjustable interception and drainage functions. The interception and drainage part is the functional part of the dam system for debris flow prevention and control through interception and drainage. The gravity wall mainly plays a blocking function, and the grille wall mainly plays a drainage function. The "lower interception" function of the gravity wall guides the debris flow to accumulate to the designed height in front of the dam, and then starts to discharge over the dam at the upper and lower boundaries of the interception combination under the guidance of the "upper discharge" function of the grille wall. Utilizing the "upper discharge and lower interception" structural design of the interception and drainage part, the height of the dividing line of the "upper discharge and lower interception" of the interception and drainage part is adjusted. h The design operating height of the sand dam is h The sand dam began to operate. h The exact meaning is the height of the barrier section where the grille separation function is exerted, which is roughly equal to the lower limit height of the grille opening of the grille wall. h 22min , which is roughly equal to the height of the gravity wall h 21 .thus, h It becomes an effective structural design variable to realize the drainage function of the dam body. hDifferent design values ​​can achieve different operating conditions of the sand dam. Taking the half-reservoir condition as an example, two standards based on reservoir capacity and water level height can be generally adopted. h As a design variable, it can effectively adjust the operating height or operating storage capacity and guide the realization of operating conditions. h The value can be designed according to the operating conditions of the sand dam.

[0017] Based on the above-mentioned assembled debris flow integrated sand-blocking dam system, the present invention further provides an optimization scheme. The following optimizations can be implemented together or separately.

[0018] Optimization 1. Optimization of connecting fasteners. As a mountain disaster prevention and control structure, the safety and stability of the prefabricated sand retaining dam requires not only the scientific and reasonable functional structural design, but also the scientific design of the connecting and fastening system composed of connecting fasteners. The optimized connecting fasteners include prestressed through-threaded steel bars, through-steel bars, non-through-steel bars, and anchor rods; among them, the pier row and the barrier row are connected by prestressed through-threaded steel bars, and fastened on the outer sides of the two end piers respectively; the left and right adjacent gravity walls / grating walls and the piers between them are connected by non-through steel bars; the guardrail and the diversion wall / wing wall are connected and anchored by anchor rods, and the anchor rods are perpendicular to the guardrail, and the anchoring depth meets the anti-slip calculation; the bottom wing wall panels are connected and fastened to the end piers through non-through steel bars, and the remaining wing wall panels are connected and fastened to the end piers through through steel bars.

[0019] The key point of the present invention's assembly dam component connection structure system is to connect the pier array and the barrier section with prestressed through-threaded steel bars. The debris flow sand dam is a structure that bears high impact forces, especially the dam body composed of the pier array and the barrier section, which is subject to the greatest impact. In the through-connection structure between the two, by using prestressed through-steel bars, the bending strength of the dam body when subjected to external impact can be significantly improved. At the same time, because the prestressed steel bars have a "binding" effect on the structural cross-section, the shear resistance of the overall structure is also improved.

[0020] Optimization 2. Optimization of the foundation. The end of the foundation beam is vertically lifted up to form a guard arm, the pier row is located between the two guard arms, the outer sides of the two end piers are respectively in close contact with the inner sides of the two guard arms, the upstream and downstream sides of the pier row on the foundation are respectively concave to form a rectangular foundation seat, the guard tank part and the guide wall part or the wing wall part are connected in the foundation seat; there is a groove on the connection surface between the foundation beam and the gravity wall, and the gravity wall is installed in the groove.

[0021] Optimization 3. Optimization of the drainage section. In order to give full play to the adjustable characteristics of the drainage function, the upper and lower wall structures of the drainage wall can be adjusted and deformed within the conceptual framework. The gravity wall can be designed as a terrace shape and additional drainage holes can be added. The grille openings of the grille wall can be designed with different opening shapes, opening specifications, and transmittances according to their different positions in the dam body.

[0022] Optimization 4. Optimization of the tank guard.

[0023] By adjusting the thickness of different sections of the apron, the protection function of the apron on the ditch bed is enhanced. Among them, the thickness of the upstream section of the apron in front of the dam is less than that of the downstream section, forming an ascending step structure along the positive direction of the channel x. The apron behind the dam is thicker overall, and its thickness is not less than the thickness of the apron in front of the dam near the foundation beam section.

[0024] The paving bricks of the apron are designed as right-angled Z-shaped pieces, with a cubic brick body in the middle. The upper part of one side of the brick body extends into a positioning arm, and the lower part of the opposite side extends into a positioning seat. The lower side of the positioning arm and the upper side of the positioning seat respectively have mutually matching positioning interlocking parts. The advantage of the right-angled Z-shaped paving bricks is that they can simplify the component design workload while strengthening the ditch bed protection function in the apron design. Specifically: on the one hand, through the front and rear overlapping of the front and rear positioning arms and the positioning seats, a larger contact connection area can be provided between the interlocking paving bricks to ensure the interlocking effect; on the other hand, by adjusting the length, width and height specifications of the cubic brick body, the paving area of ​​the paving bricks and the thickness of the apron can be flexibly changed to meet the design protection function needs of different apron sections; finally, by adjusting the length of the positioning arm and the positioning seat and the number of positioning interlocking parts on them, the interlocking force of adjacent paving bricks can be quickly adjusted.

[0025] Optimization 5. Optimization of the diversion part. The diversion wall adopts a masonry wall with staggered upper and lower joints and concave-convex meshing. The wall bricks are concave-convex pieces. The upper and lower wall bricks are meshed through the concave and convex parts of the connecting surface. The left and right connecting seams of the bottom wall bricks are staggered with the connecting seams of the lower paving bricks. The bottom wall bricks are connected and fastened to the dam front guard tank through connecting fasteners.

[0026] Optimization 6. Optimization of the wing wall. The wing wall panels are interlocked by the engagement of the concave and convex parts of the connection surface. The bottom wing wall panels are connected and fastened to the dam rear guard tank through connecting fasteners, and connected and fastened to the end pier through non-penetrating steel bars. The remaining wing wall panels are connected and fastened to the end pier through penetrating steel bars.

[0027] The present invention also provides a construction method for the assembled debris flow comprehensive sand-blocking dam system of the present invention, and the specific scheme is as follows.

[0028] A construction method of an assembled debris flow integrated sand-blocking dam system is implemented according to the following steps:

[0029] Step S100: Obtain basic data of the comprehensive sand-blocking dam system construction project through on-site investigation, and determine the engineering design objectives and relevant parameters of the comprehensive sand-blocking dam system according to the basic data;

[0030] Step S200, dividing the prefabricated components and the cast-in-place concrete parts, and processing the prefabricated components;

[0031] Step S300: On-site construction

[0032] Step S310: pouring the foundation

[0033] Excavate the foundation pit, level the site, measure and lay out, determine the pouring layout, lay a concrete cushion of designed thickness at the bottom of the foundation pit, tie the steel bars of the foundation beam and the bottom of the pier, reserve connection ports at the corresponding connection positions, and pour concrete into the foundation beam; when the concrete strength of the foundation beam reaches the designed strength, backfill the foundation pit, tie the steel bars in the upper area of ​​the pier, support the formwork and pour the pier to ensure one-time continuous pouring and forming;

[0034] Step S320: Assemble the drainage block

[0035] When the concrete strength of the middle pier in the pier row reaches the design strength, the gravity walls on both sides are hoisted to the assembly position, non-penetrating steel bars are installed to connect and tighten the pier and the gravity wall, and the reserved assembly holes are grouting; the grille walls on both sides are hoisted to the assembly position above the gravity walls on both sides, non-penetrating steel bars are installed to connect and tighten the pier and the grille wall, and the reserved assembly holes are grouting to complete the assembly of the middle guardrail;

[0036] Continue to assemble the middle barrier assembly and the barrier assemblies on both sides in a symmetrical construction sequence on the left and right sides to complete the assembly of the barrier assembly;

[0037] Step S330: Assembling prestressed through-threaded steel bars

[0038] After all non-through steel bars are connected, insert prestressed through-threaded steel bars into the reserved holes, apply prestress at both ends and fix them by post-tensioning method, and grout the reserved assembly holes after inspection.

[0039] Step S340: Assemble the tank guard

[0040] When the concrete strength of the foundation beam reaches the design requirements, assemble the apron part; first lay the brick paving pieces of the apron in front of the dam / the apron behind the dam, then drive the anchor rods into the ditch bed rock mass through the reserved assembly holes, and reserve the assembly section of the diversion wall on the upper part of the anchor rods of the apron in front of the dam;

[0041] Step S350: Assembling the guide wall

[0042] Insert the assembly holes of the bottom wall bricks into the upper assembly section of the anchor rod, tighten the anchor rod, assemble the upper wall bricks layer by layer, and complete the assembly of the guide walls on both sides;

[0043] Step S360: Assembling the wing wall

[0044] Lift the bottom wing wall panels to the assembly position, install non-penetrating steel bars to connect the end piers and the bottom wing wall panels, tighten the non-penetrating steel bars, drive anchor rods from the top of the bottom wing wall panels into the assembly holes, penetrate the brick paving pieces of the rear apron of the dam to the ditch bed rock mass, assemble the upper wing wall panels layer by layer, and connect and tighten each wing wall panel to the end pier through the through steel bars, grout the reserved assembly holes, and complete the assembly of the wing walls on both sides;

[0045] Among all the steps of the above-mentioned on-site construction process, those involving cast-in-place concrete construction must, after the pouring is completed, in addition to routine maintenance, thermal insulation and moisture retention maintenance must be carried out in accordance with specifications to keep the concrete surface moist.

[0046] The field investigation referred to in this technology includes various geological surveys, explorations, mapping, and measurement work on the site of the mountain torrent mud-rock flow channel where the planning scheme is located, as well as existing simulation experiments, test experiments, observation experiments, and analysis experiments in the field, as well as the acquisition of historical disaster records, relevant technical specifications, and empirical methods and data acquisition for reference. The data obtained from the field investigation are collectively referred to as the basic data of this technical scheme.

[0047] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The prefabricated debris flow comprehensive sand-blocking dam system of the present invention is a comprehensive debris flow sand-blocking dam system including the main dam body, apron, diversion wall and wing wall. Except for the base part as a stable skeleton, all other structural functional parts of the system are prefabricated and assembled. Compared with the prior art that only solves the technical problem of limited prefabricated design of the main dam body of the sand-blocking dam, the present invention solves the technical problem of using prefabricated concrete technology to achieve comprehensive prevention and control such as main dam body interception and drainage, ditch bed protection and energy dissipation, and bank slope protection. It is a sand-blocking dam solution under the concept of a new prefabricated concrete technology. (2) In the core main dam body part, the present invention gets rid of the three-section form of dam shoulder-overflow section-dam shoulder in the prior art, and completely reconstructs it in the form of a pen-shaped skeleton plug-in interception wall. The interception and drainage combination combines the different advantages of the debris flow gravity dam and the grid dam to ensure high structural stability while realizing the functions of lower interception and upper drainage, and interception of coarse and fine. It has both flexible and adaptable structure. By completely reconstructing the main dam structure, the technical solution incorporates multiple variables including the shape of the upper and lower walls, specifications, center of gravity, upper and lower functional boundary heights, permeability forms and their combinations, and permeability ratios into the main dam structure and functional design elements, expanding the effective range of technical elements for the design and transformation of the main dam, so that the main dam function can be adapted to the goal of ditch debris flow prevention and control as much as possible during the design and operation process. In particular, during the long-term operation of the sand retaining dam, the combination of various design elements can be readjusted around the upper and lower functional boundary heights according to the changes in the ditch environment, and the sand retaining dam can be renovated, thereby extending the service life and prevention effect of the dam and giving full play to the advantages of prefabricated assembled concrete technology. (3) The assembled apron part makes full use of the specific structure of the brick paving parts, so that the design of the apron can strengthen the ditch bed protection function while simplifying the component design workload, greatly improving the efficiency of the apron design. (4) The system component unit of the present invention has a small number of types, the component installation is simple, and it is easy to realize factory prefabrication. Therefore, the components of different dams during the construction and transformation process can be used interchangeably to a certain extent, improving the turnover rate of prefabricated parts. The construction method uses pre-embedded installation parts to connect the functional modules, ensuring the consistency and standardization of the connection points and improving the overall quality and reliability of the project. This technical solution gives full play to the advantages of prefabricated concrete technology in debris flow sand dam projects, which can significantly improve construction efficiency, save construction and maintenance costs, and adapt to special needs such as emergency rescue. At the same time, by reducing the negative impact of construction on the ecological environment, it helps to promote the popularization and implementation of green construction concepts. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the overall structure of the assembled debris flow comprehensive sand-blocking dam system.

[0049] Figure 2 It is a schematic diagram of the basic structure.

[0050] Figure 3 It is a schematic diagram of the structure of the barrier and pier array.

[0051] Figure 4 (a) Figure 4 (b) is a schematic diagram of several structures of barrier combinations.

[0052] Figure 5 It is a schematic diagram of the tank guard and foundation beam structure.

[0053] Figure 6 (a) Figure 6 (b) is a schematic diagram of the positioning interlocking structure between the paving pieces and the base.

[0054] Figure 7 (a)~ Figure 7 (c) is a schematic diagram of several deformation structures of paving bricks.

[0055] Figure 8 It is a schematic diagram of the assembly structure of the diversion wall.

[0056] Fig. 9 It is a schematic diagram of the wing wall assembly structure.

[0057] Fig.10 It is a schematic diagram of the fastener locations connecting the pier and the guardrail.

[0058] Fig.11 (a) Fig.11 (b) is a schematic diagram of the steel bar hole positions of the barrier combination.

[0059] Fig.12 It is a schematic diagram of the connection fastener locations on the upstream side of the foundation beam.

[0060] Fig.13 It is a schematic diagram of the connection fastener location on the downstream side of the foundation beam.

[0061] Fig.14 (a)~ Fig.14 (c) is a schematic diagram showing the meaning of some parameters.

[0062] The numbers in the accompanying drawings are:

[0063] 1 foundation part; 11 foundation beam; 111 guard arm; 112 foundation seat; 113 groove; 12 pier; 121 end pier; 2 drainage part; 21 gravity wall; 211 spillway; 22 grating wall; 3 guard tank part; 31 guard tank in front of dam; 311 upstream section; 312 downstream section; 32 guard tank behind dam; 33 brick paving parts; 331 brick body; 332 positioning arm; 333 positioning seat; 334 positioning interlocking parts; 3341 square rod; 3342 square groove; 4 diversion wall; 41 wall brick parts; 411 convex parts; 412 concave parts; 413 coin-shaped parts; 414 smooth surface; 5 wing wall; 51 wing wall panel; 6 connecting fasteners; 61 prestressed through-threaded steel bars; 62 through-steel bars; 63 non-through-steel bars; 64 anchor rods. DETAILED DESCRIPTION

[0064] The preferred technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0065] Embodiment 1

[0066] The technical solution of the present invention is adopted to design an assembled debris flow permeable sand-blocking dam system with comprehensive functions for a debris flow channel.

[0067] Figure 1 It is a schematic diagram of the overall structure of the assembled debris flow comprehensive sand-blocking dam system.

[0068] The assembled debris flow integrated sand-blocking dam system (hereinafter referred to as the sand-blocking dam system) includes a foundation part 1, a drainage part 2, a tank protection part 3, a diversion wall part, a wing wall part, and connecting fasteners 6. In the system, the foundation part 1 is cast on site at the dam site, and the remaining parts are assembled structures, which are connected to the foundation part 1 by assembly to form a complete system.

[0069] Figure 2 It is a structural schematic diagram of the base part 1.

[0070] The foundation part 1 is of a pen-shaped shape, with a foundation beam 11 in the channel direction y at the bottom and a single row of piers perpendicular to the foundation beam 11 at the top. The piers 12 are arranged at intervals, and the piers 12 at both ends of the piers are end piers 121. In the channel direction x, the width of the foundation beam 11 is w 11 Greater than the width of pier 12 w 12 .

[0071] The cross section of the buttress 12 can be in any necessary shape such as rectangular, elliptical or circular.

[0072] In the sand-blocking dam system, each component is connected and intersected at the foundation part 1. In order to enhance the stability of the connection and intersection and improve the overall impact resistance of the sand-blocking dam system, the end of the foundation beam 11 is vertically lifted up to form a guard arm 111, and the pier row is located between the two guard arms 111. The outer side surfaces of the two end piers 121 are respectively in close contact with the inner side surfaces of the two guard arms 111. On the foundation beam 11, the upstream and downstream sides of the pier row are concave to form rectangular foundation seats 112 respectively, and the guard tank part 3 and the guide wall part or the wing wall part are all connected in the foundation seat 112.

[0073] The foundation part 1 is cast on site at the dam site. If the dam height is large (for example, the dam height ≥ 15 m), a concrete structure is preferably used. Otherwise (the dam height < 15 m), a reinforced concrete structure can be used.

[0074] Figure 3 It is a schematic diagram of the structure of the barrier section 2 and the pier row.

[0075] The drainage portion 2 is a drainage wall fixed between the piers 12 . There is a drainage combination between adjacent piers 12 , including a lower gravity wall 21 and an upper grille wall 22 .

[0076] The preliminary research of this invention investigated the anti-sliding and anti-overturning safety performance of the permeable sand-blocking dam under various operating conditions. It was found through empirical calculation that the semi-reservoir operation (using the water level height standard, that is, according to the water level designed by the dam, the operation strategy starts when the water level reaches about 50% of the designed maximum water level) of the sand-blocking dam can take into account the improvement of the three aspects of dam body anti-sliding, dam body anti-overturning and foundation bearing capacity, and has a higher comprehensive safety factor, which is an overall safer operating state. Based on this research finding, in this case, the height of the design boundary line of "upper row and lower block" is h Height of barrier combination H 1 / 2 of the design h = h 21 ,or h = h 22min ,or h =( h 21 + h 22min ) / 2, which can be combined with h 21 and h 22min The difference between the two and the conditions for the processing and assembly of prefabricated parts can be determined. This can lead to a relatively safer half-storage overcurrent condition.

[0077] Figure 4 (a) Figure 4 (b) is a schematic diagram of several structures of barrier combination, among which Figure 4 (a) shows a gravity wall 21, Figure 4(b) shows the grille wall 22.

[0078] According to the debris flow prevention and control function designed for the field of the sand dam system engineering, the structure and form of the barrier assembly can be adjusted and deformed within the conceptual framework. For example, the gravity wall 21 is designed as a terrace, which can increase the blocking gravity and enhance the "downward blocking" effect, and can also reduce the center of gravity height of the barrier assembly, enhance the anti-slip and anti-overturning performance of the dam body, and at the same time expand the construction work space. The gravity wall 21 can open a drainage hole 211 to accelerate the drainage and promote the rapid accumulation of debris flow in front of the dam.

[0079] According to the particle distribution characteristics of the channel debris flow, in order to meet the interception requirements of mud and sand with different particle sizes, the grid wall 22 can be designed with different opening shapes, opening specifications, transmittances, etc.

[0080] During the service life of the sand-blocking dam, if the designed drainage function changes due to the change of the channel environment, the core functions of the sand-blocking dam system can be quickly adjusted by updating the design elements of the gravity wall 21 and the grille wall 22, and redesigning and renovating the drainage structure 2 and the drainage function of the dam body accordingly. For example, adjust the upper and lower height ratio of the drainage combination to change the operating height of the dam; or adjust the design operating conditions based on the water level to the reservoir capacity; or adjust the shape and specifications of the gravity wall 21 to change the height of the center of gravity of the drainage combination; or adjust the opening form of the grille wall 22 to change the permeability and permeability layout of different parts of the dam body, etc. Therefore, the advantages of prefabricated concrete technology can be more fully utilized in the sand-blocking dam system, realizing the long-term adaptation of the prevention and control functions and prevention and control goals of the sand-blocking dam.

[0081] A groove 113 is formed at the connection surface between the foundation beam 11 and the gravity wall 21, and the gravity wall 21 is installed in the groove 113. By installing the barrier assembly in the groove 113, the anti-overturning stability of the foundation part 1 can be improved.

[0082] Figure 5 It is a schematic diagram of the structure of the tank guard 3 and the foundation beam 11.

[0083] The guard 3 is a paving layer of bricks 33 covering the trench bed, and adjacent bricks 33 are connected and fixed by a positioning interlocking mechanism on the connecting surface. The guard 3 includes a dam front guard 31 and a dam rear guard 32, which are respectively connected to the upstream and downstream sides of the pier row on the foundation beam 11. In the cross-channel direction y, the length of the dam front guard 31 is l 31 Or the length of the dam guard tank 32 l 32 Not more than the length of foundation beam 11 l 11 .

[0084] In this example, the dam front guard 31 or the dam rear guard 32 is specifically connected to the base 112 .

[0085] The thickness of the upstream section 311 of the dam guard 31 is less than that of the downstream section 312, forming an ascending stepped structure along the positive direction of the channel x. In the sand retaining dam system, the main function of the guard 3 is to slow down the impact of the rapid water flow and debris flow from the upstream and protect the foundation 1; at the same time, by dispersing and reducing the kinetic energy of debris flow, it prevents the erosion of the ditch bed or the erosion of the dam foundation caused by high-speed debris flow, thereby extending the service life of the dam body. By adopting a downstream gradually ascending stepped structure, it can be achieved that, first, the thick dam guard 31 of the ditch bed near the foundation 1 effectively protects the foundation 1; secondly, the ascending step plays the role of an energy dissipation sill to a certain extent, reducing the damage of the debris flow to the ditch bed; finally, the thin dam guard 31 is used in the far foundation 1 to reduce the material and labor costs.

[0086] The thickness of the rear apron 32 is not less than the thickness of the front apron 31 near the foundation beam 11. Since the potential energy of the debris flow tongue after passing the dam is converted into kinetic energy, the impact and destructive ability is stronger, therefore, the thickness of the rear apron 32 can be further increased.

[0087] In order to simplify the design of assembly parts at the connection between the guide wall 4 and the dam front guard 31 and reduce the types and quantity of special prefabricated parts, while the overall design of the dam front guard 31 is stepped, the connection areas between the two sides of the dam front guard 31 and the guide wall 4 can maintain the same thickness, that is, it does not change with the stepped shape, so that the connection surface between the dam front guard 31 and the guide wall 4 remains a continuous plane.

[0088] Figure 6 (a) Figure 6 (b) is a schematic diagram of the positioning interlocking structure of the paving member 33 and the base 112, wherein Figure 6 (a) shows the positioning interlocking structure between the paving bricks 33, Figure 6 (b) shows the positioning interlocking structure between the paving brick 33 and the base 112.

[0089] The paving brick piece 33 is a right-angled Z-shaped piece, with a cubic brick body 331 in the middle. The upper part of one side of the brick body 331 extends into a positioning arm 332, and the lower part of the opposite side extends into a positioning seat 333. The lower side of the positioning arm 332 and the upper side of the positioning seat 333 are respectively provided with mutually fitting positioning interlocking parts 334; the paving layer of the guard tank portion 3 is connected and extended through the positioning arm 332 and the positioning seat 333 of the adjacent paving brick piece 33; the base seat 112 has a positioning interlocking part 334 that fits with the positioning interlocking part 334 of the positioning arm 332.

[0090] In this example, the positioning interlocking piece 334 adopts pestle-mortar matching. The positioning interlocking piece 334 of the positioning arm 332 is a square rod 3341, the positioning interlocking piece 334 of the positioning seat 333 is a square groove 3342, and the positioning interlocking piece 334 of the base seat 112 is consistent with the positioning seat 333. The base seat 112 and the paving piece 33 are connected through the notch of the pestle-mortar matching, which can improve the anti-overturning stability of the base part 1.

[0091] Figure 7 (a)~ Figure 7 (c) is a schematic diagram of several deformation structures of the paving brick 33, wherein Figure 7 (a) Figure 7 (b) shows the circular pestle-mortar structure. Figure 7 (c) shows a multi-tooth plug-in structure.

[0092] In order to adapt to the protection requirements of different parts of the ditch bed, especially special parts, the brick laying parts 33 can flexibly change the specifications of the brick body 331, the length of the positioning arm 332, the number of positioning interlocking parts 334 on the positioning arm 332, etc. Figure 7 The positioning interlocking member 334 in (a) and (b) is designed as a circular pestle and mortar, and the positioning interlocking member 334 in (c) is designed as a multi-tooth plug.

[0093] Figure 8 It is a schematic diagram of the assembly structure of the guide wall 4.

[0094] The diversion wall part includes two diversion walls 4 on the left and right, which are masonry walls with staggered bricks 41, connecting the front face of the end pier 121 and the dam front apron 31. The diversion wall part is used to guide the movement direction of the debris flow when passing through the dam, so as to prevent the debris flow from eroding the upstream slope and the dam foundation.

[0095] The main function of the diversion wall 4 is to guide the flow direction of the debris flow in front of the dam. Since the flow state of the debris flow in front of the dam is mainly affected by the topography of the channel and moves with the situation, there is generally no large external constraint that significantly changes its shape. Therefore, the assembly parts of the diversion wall 4 can use relatively small prefabricated components, and the wall imitates the masonry structure. The wall bricks 41 are concave-convex parts, and the upper and lower wall bricks 41 are engaged through the concave and convex parts of the connecting surface. As a result, the diversion wall 4 constitutes a masonry wall with upper and lower staggered concave-convex engagement. The left and right connecting seams of the bottom wall bricks 41 are offset from the left and right connecting seams of the lower paving bricks 33.

[0096] The standard specification parts of the wall tile 41 include convex parts 411, concave parts 412, and coin-shaped parts 413. The upper and lower connecting surfaces of the wall tile 41 are divided into meshing surfaces and smooth surfaces 414. The former is the upper and lower connecting surfaces with concave / convex parts, and the latter is the opposite. The standard cross-row of the wall is assembled with coin-shaped parts 413 and the convex part of the coin-shaped parts 413 is downward, the bottom layer of the wall tile 41 is assembled with the concave parts 412 and the smooth surface 414 is upward, and the top layer of the wall tile 41 is assembled with the convex parts 411 and the smooth surface 414 is upward. The corners of the wall are assembled with necessary semi-standard specification parts.

[0097] In this example, the diversion wall 4 is as high as the gravity wall 21 and as long as the dam front apron 31 .

[0098] Fig. 9 It is a schematic diagram of the assembly structure of wing wall 5.

[0099] The wing wall section includes two left and right wing walls 5, which are walls made of wing wall panels 51, connecting the backflow surface of the end pier 121 and the dam rear guard tank 32. The function of the wing wall section is to control the diffusion of debris flow after crossing the dam to both sides and reduce the scouring of the downstream channel slope.

[0100] The main function of the wing wall 5 is to guide the debris flow behind the dam. The potential energy of the mud tongue of the debris flow behind the dam is converted into kinetic energy, and the impact and destructive ability is stronger; and, with the sudden disappearance of the lateral contraction effect of the grille opening after passing the dam, the mud tongue shape spreads to both sides. Therefore, the guidance of the debris flow over the dam requires stronger lateral support than the guidance of the debris flow in front of the dam, so as to enhance the anti-slip ability of the dam body. For this reason, the wing wall 5 needs to adopt relatively large prefabricated components to increase the force stability. Each layer of the wing wall 5 is a wing wall panel 51, and the upper and lower wing wall panels 51 are connected and fixed by the positioning interlocking mechanism of the connecting surface.

[0101] In this example, the upper and lower wing wall panels 51 are positioned and interlocked by the engagement of the concave and convex portions of the connecting surface.

[0102] According to the topography of the dam site, the wing wall 5 may be a rectangle or a right-angled hypotenuse (such as a right-angled trapezoid or a right-angled triangle), and the specific shape of the wing wall panel 51 is determined according to the shape of the wing wall 5 .

[0103] The connecting fasteners 6 connect and fasten the connecting parts of the sand retaining dam system.

[0104] Embodiment 2

[0105] An assembled debris flow integrated sand retaining dam system is designed. The same points as those in the first embodiment are not repeated here. The difference lies in the selection of the connecting fastener 6 and the design of the installation position.

[0106] The connecting fastener 6 includes a prestressed through-threaded steel bar 61 , a through-steel bar 62 , a non-through-steel bar 63 , and an anchor rod 64 .

[0107] Fig.10 It is a schematic diagram of the fastener parts connecting the buttress 12 and the barrier 2.

[0108] The pier row and the barrier section 2 are connected by prestressed through-threaded steel bars 61, which are tightened on the outer sides of the two end piers 121. Generally, there are 4 groups of prestressed through-threaded steel bars 61, which respectively connect the upper and lower parts of the gravity wall 21 and the pier row, and the upper and lower parts of the grille wall 22 and the pier row. Each group contains at least two parallel prestressed through-threaded steel bars 61. Compared with ordinary steel bars, threaded steel bars have the advantages of strong adhesion and high tensile strength, and are suitable for structures that bear high stress. Therefore, in the dam body part, the connection structure can significantly improve the response performance of the assembled structure to the impact of debris flows and ensure safety and stability through the selective combination of macro and micro levels.

[0109] Fig.11 (a) Fig.11 (b) is a schematic diagram of the steel bar hole positions of the barrier combination, where Fig.11 (a) shows a gravity wall 21, Fig.11 (b) shows the grille wall 22.

[0110] The left and right adjacent gravity walls 21 or the left and right adjacent grid walls 22 and the piers 12 therebetween are connected by non-penetrating steel bars 63 .

[0111] Fig.12 is a schematic diagram of the connection fastener position on the upstream side of the foundation beam 11; Fig.13 It is a schematic diagram of the connection fastener position on the downstream side of the foundation beam 11.

[0112] The apron part 3 and the diversion wall 4 or the apron part 3 and the wing wall 5 are connected and anchored by anchor rods 64. The anchor rods 64 are perpendicular to the apron part 3. The anchoring depth meets the anti-slip and anti-overturning calculation requirements of the main dam body.

[0113] The bottom wing wall panels 51 are connected and fastened to the end buttress 121 via non-penetrating steel bars 63 , and the remaining wing wall panels 51 are connected and fastened to the end buttress 121 via penetrating steel bars 62 .

[0114] Fig.14 (a)~ Fig.14 (c) is a schematic diagram of the meaning of some parameters, where Fig.14 (a) shows the basic part 1 l 11 , w 11 , w 12 , Fig.14 (b) shows the base part 1 w 11 , Tank Guard l 31 , l 32 , Fig.14 (c) Indicates the middle of the blocking section H , h , h 21 , h 22min .

[0115] Embodiment 3

[0116] Embodiment 2: Construction plan for the assembly-type debris flow integrated sand retaining dam system.

[0117] 1. On-site investigation to obtain basic data

[0118] The basic data of the construction project of the prefabricated debris flow integrated sand-blocking dam system are obtained through on-site investigation. The basic data mainly include: topographic data, meteorological and hydrological data, recommended preventive measures, prevention and control engineering survey data, human engineering activities, debris flow disaster data, and other data. According to the basic data, the engineering design objectives and relevant parameters of the sand-blocking dam system are determined, mainly including: dam height, foundation burial depth, gravity dam crest width, gravity dam slope, grid spacing of the grid part, operating conditions, etc.; the load combination should consider the deadweight of the dam body, the weight of the silted soil in the dam reservoir, impact force, horizontal side pressure and seismic force.

[0119] 2. Design of prefabricated debris flow comprehensive sand-blocking dam system

[0120] 2.1 Classification of precast components and cast-in-place concrete

[0121] The prefabricated integral structure is a building structure that combines prefabricated components with cast-in-place concrete. Therefore, it is necessary to divide the prefabricated component part and the cast-in-place concrete part in the sand retaining dam system. See Table 1 for details.

[0122] Table 1 Classification of assembled integral structures of sand dam system

[0123]

[0124] 2.2 Prefabricated component processing

[0125] Unless otherwise specified, the prefabricated and assembled components listed in Table 1 can be flexibly made of concrete or reinforced concrete according to local material prices and transportation costs. All prefabricated concrete assemblies are pre-assembled with connectors, fasteners, etc. according to their assembly positions in accordance with the requirements of the normative documents on assembly construction, or the installation positions of connectors and fasteners are reserved.

[0126] The specifications and design of each component shall be carried out in accordance with relevant norms, technical manuals, etc.

[0127] 3. Main on-site construction steps

[0128] Step 1: Casting foundation part 1

[0129] Excavation of foundation pit, site leveling, surveying and laying out, and at the same time, determination of the layout of foundation beam 11, layout of piers 121 and trough 113 on foundation beam 11, and layout of connection positions of guardrail portion 3 and diversion wall or wing wall on foundation seat 112 according to the structure of sand retaining dam system.

[0130] A concrete cushion layer of designed thickness (8 cm thick in this case) is laid at the bottom of the foundation pit, the steel bars of the foundation beam 11 and the bottom steel bars of the pier 12 are tied, and connection grooves / openings are reserved at the corresponding connection positions, and the foundation beam 11 is poured with concrete.

[0131] When the concrete strength of foundation beam 11 reaches the designed strength, backfill the foundation pit, tie the steel bars in the upper area of ​​pier 12, support the formwork and cast pier 12 to ensure one-time continuous casting and forming.

[0132] During each step of the concrete pouring process, attention should be paid to reserving assembly holes for the connecting fasteners 6.

[0133] 2. Assemble the barrier 2

[0134] The assembly of the drainage barrier 2 is carried out in a symmetrical sequence from the middle to both sides.

[0135] When the concrete strength of the middle pier 12 in the pier row reaches the design strength, the gravity walls 21 on both sides are hoisted to the groove 112 respectively, and the non-penetrating steel bars 63 are installed to connect and fasten the pier 12 and the gravity wall 21, and the reserved assembly holes are grouted; the grille walls 22 on both sides are hoisted to the construction positions above the gravity walls 21 on both sides, and the non-penetrating steel bars 63 are installed into the reserved assembly holes to connect the pier 12 and the grille wall 22, and the non-penetrating steel bars 63 are fastened at the ends, and the reserved assembly holes are grouted to complete the combined assembly of the middle guardrail.

[0136] During the hoisting process of the grille wall 22, a temporary support structure, such as an inclined support steel pipe, needs to be built if necessary to maintain the stability of the grille wall 22 and surrounding parts. When the mortar strength reaches the requirement and the structure is stable, the temporary support structure is removed.

[0137] Continue to assemble the middle guardrail assembly and the guardrail assemblies on both sides in a symmetrical construction order on the left and right sides to complete the assembly of the guardrail section 2.

[0138] 3. Assemble prestressed through-threaded steel bars 61

[0139] After all non-through steel bars 63 are connected, insert the prestressed through threaded steel bars 61 into the reserved holes, apply prestress at both ends and fix them by post-tensioning method, and grout the reserved assembly holes after passing the inspection.

[0140] When inserting the prestressed through-threaded steel bar 61, the installation and insertion can be adopted to avoid the insertion difficulties caused by the blockage and the like at the end of the insertion.

[0141] 4. Assemble the tank guard 3

[0142] When the concrete strength of the foundation beam 11 reaches the design requirements, the apron part 3 is assembled, and the apron in front of the dam 31 and the apron behind the dam 32 are assembled in sections. The brick paving pieces 33 of the apron in front of the dam 31 / the apron behind the dam 32 are laid first, and then the anchor rods 64 are driven into the reserved assembly holes to the ditch bed rock mass, and the assembly section of the diversion wall 4 is reserved above the anchor rods 64 of the apron in front of the dam 31.

[0143] 5. Assemble the diversion wall

[0144] Insert the assembly holes of the bottom wall bricks 41 into the upper assembly sections of the anchor rods 64, tighten the anchor rods 64, and assemble the upper wall bricks 41 layer by layer to complete the assembly of the guide walls 4 on both sides.

[0145] 6. Assemble the wing wall

[0146] Lift the bottom wing wall panel 51 to the assembly position, install the non-penetrating steel bars 63 to connect the end pier 121 and the bottom wing wall panel 51, tighten the non-penetrating steel bars 63, drive the anchor rod 64 from the top of the bottom wing wall panel 51 into the assembly hole, penetrate the paving bricks 33 of the rear apron 32 of the dam to the ditch bed rock mass, assemble the upper wing wall panel 51 layer by layer, each wing wall panel 51 is connected and tightened to the end pier 121 through the penetrating steel bars 62, grout the reserved assembly holes, and complete the assembly of the wing walls 5 on both sides.

[0147] Among all the steps of the above-mentioned on-site construction process, those involving cast-in-place concrete construction must, after the pouring is completed, be subject to thermal insulation and moisture retention maintenance in accordance with specifications in addition to routine maintenance.

Claims

1. Assembled debris flow integrated sand dam system, characterized by: It comprises a foundation part (1), a drainage part (2), a tank guard part (3), a diversion wall part, a wing wall part, and connecting fasteners (6), wherein the foundation part (1) is cast on site at the dam site, and the remaining parts are prefabricated structures and are assembled, connected and fastened to the foundation part (1); The foundation part (1) is of a pen-shaped type, the lower part is a foundation beam (11) across the channel direction y, the upper part is a single row of piers perpendicular to the foundation beam (11), the pier row is composed of piers (12) arranged at intervals, and the piers (12) located at both ends of the pier row are end piers (121); in the channel direction x, the width of the foundation beam (11) is w 11 Greater than the width of the buttress (12) w 12 ; The barrier section (2) is a barrier wall fixed between the buttresses (12), and a barrier assembly is formed between adjacent buttresses (12), comprising a lower gravity wall (21) and an upper grid wall (22); The apron part (3) is a paving layer of brick paving pieces (33) covering the ditch bed, and adjacent brick paving pieces (33) are connected and fixed by a positioning interlocking mechanism on a connecting surface. The apron part (3) includes a dam front apron (31) and a dam rear apron (32), which are respectively connected to the upstream and downstream sides of the pier row on the foundation beam (11); in the cross-ditch direction y, the length of the dam front apron (31) is l 31 Or the length of the dam guardrail (32) l 32 Not greater than the length of the foundation beam (11) l 11 ; The diversion wall portion comprises two diversion walls (4) on the left and right, the diversion wall (4) being a masonry wall body with staggered upper and lower seams of wall bricks (41), connecting the flow-facing surface of the end buttress (121) and the dam front guard (31); The wing wall portion comprises two left and right wing walls (5), the wing wall (5) being a wall body formed by layered splicing of wing wall panels (51), connecting the back flow surface of the end buttress (121) and the dam rear guard tank (32), each layer of the wing wall (5) being a wing wall panel (51), and the upper and lower wing wall panels (51) being connected and fixed by a positioning interlocking mechanism on the connection surface; The connecting fasteners (6) connect and fasten the connecting points of various parts of the comprehensive sand retaining dam system.

2. The assembled debris flow integrated sand-blocking dam system according to claim 1 is characterized by: The end of the foundation beam (11) is vertically lifted up to form a guard arm (111), the pier row is located between the two guard arms (111), the outer side surfaces of the two end piers (121) are respectively in close contact with the inner side surfaces of the two guard arms (111), the upstream and downstream sides of the pier row on the foundation beam (11) are respectively recessed to form a rectangular foundation seat (112), and the guard tank portion (3) and the guide wall portion or the wing wall portion are all connected in the foundation seat (112); the connection surface between the foundation beam (11) and the gravity wall (21) is provided with a groove (113), and the gravity wall (21) is installed in the groove (113).

3. The assembled debris flow integrated sand-blocking dam system according to claim 2 is characterized by: The brick paving piece (33) is a right-angled Z-shaped piece, the middle part of which is a cubic brick body (331), the upper part of one side of the brick body (331) extends into a positioning arm (332), and the lower part of the opposite side extends into a positioning seat (333), and the lower side of the positioning arm (332) and the upper side of the positioning seat (333) respectively have mutually matching positioning interlocking pieces (334); the paving layer of the guard (3) is connected and extended through the positioning arm (332) and the positioning seat (333) of the adjacent brick paving piece (33); and the base seat (112) has a positioning interlocking piece (334) matching with the positioning interlocking piece (334) of the positioning arm (332).

4. The assembled debris flow integrated sand-blocking dam system according to claim 3 is characterized by: The positioning interlocking piece (334) of the positioning arm (332) is a square rod (3341), the positioning interlocking piece (334) of the positioning seat (333) is a square groove (3342), and the positioning interlocking piece (334) of the base seat (112) is consistent with that of the positioning seat (333).

5. The assembled debris flow integrated sand-blocking dam system according to claim 1 is characterized by: The thickness of the upstream section (311) of the dam front guard apron (31) is smaller than that of the downstream section (312), forming an ascending stepped structure along the positive direction of the channel x; the thickness of the dam rear guard apron (32) is not less than the thickness of the section of the dam front guard apron (31) close to the foundation beam (11).

6. The assembled debris flow integrated sand-blocking dam system according to claim 1 is characterized by: The diversion wall (4) is a masonry wall with staggered upper and lower joints and concave-convex meshing. The wall brick pieces (41) are concave-convex pieces. The upper and lower wall brick pieces (41) mesh with the concave and convex parts of the connecting surface. The left and right connecting joints of the bottom wall brick pieces (41) are staggered with the left and right connecting joints of the lower paving brick pieces (33). The bottom wall brick pieces (41) are connected and fastened to the dam front guard tank (31) via connecting fasteners (6).

7. The assembled debris flow integrated sand-blocking dam system according to claim 6 is characterized by: The standard specification parts of the wall tiles (41) include convex parts (411), concave parts (412), and coin-shaped parts (413). The standard cross-rows of the wall are assembled using coin-shaped parts (413) with the convex parts (413) facing downwards. The bottom layer of the wall tiles (41) are assembled using concave parts (412). The top layer of the wall tiles (41) are assembled using convex parts (411) with the smooth surface (414) facing upwards. The smooth surface (414) is the upper and lower connecting surface of the wall tiles (41) without concave or convex parts. The corners of the wall are assembled using semi-standard specification parts.

8. The assembled debris flow integrated sand-blocking dam system according to claim 1 is characterized by: The upper and lower wing wall panels (51) are interlocked and positioned by meshing the concave and convex parts of the connection surface. The bottom wing wall panel (51) is connected and fastened to the dam rear guard tank (32) and the end buttress (121) through the connection fastener (6), and the remaining wing wall panels (51) are connected and fastened to the end buttress (121) through the connection fastener (6).

9. The assembled debris flow integrated sand-blocking dam system according to any one of claims 1 to 8, characterized in that: The connecting fastener (6) comprises a prestressed through-threaded steel bar (61), a through-steel bar (62), a non-through-steel bar (63), and an anchor rod (64); The pier row and the barrier section (2) are connected through prestressed through-threaded steel bars (61), which are respectively fastened on the outer side surfaces of the two end piers (121); the left and right adjacent gravity walls (21) and the piers (12) therebetween, or the left and right grille walls (22) and the piers (12) therebetween, are connected by non-through steel bars (63); The apron portion (3) and the guide wall (4) or the wing wall (5) are connected and anchored by anchor rods (64), the anchor rods (64) are perpendicular to the apron portion (3), and the anchoring depth satisfies the anti-slip calculation. The bottom wing wall panels (51) are connected and fastened to the end buttress (121) by non-penetrating steel bars (63), and the remaining wing wall panels (51) are connected and fastened to the end buttress (121) by penetrating steel bars (62).

10. The assembled debris flow integrated sand-blocking dam system according to claim 9 is characterized in that: Height of the dividing line between upper row and lower row of the barrier h Designed according to the semi-warehouse operating conditions.

11. The construction method of the assembled debris flow integrated sand-blocking dam system according to claim 10 is characterized by: Follow the steps below: Step S100: Obtain basic data of the comprehensive sand-blocking dam system construction project through on-site investigation, and determine the engineering design objectives and relevant parameters of the comprehensive sand-blocking dam system according to the basic data; Step S200, dividing the prefabricated components and the cast-in-place concrete parts, and processing the prefabricated components; Step S300, on-site construction; Step S310, pouring the foundation part (1); Excavating the foundation pit, leveling the site, measuring and laying out the lines, determining the pouring layout, laying a concrete cushion layer of designed thickness at the bottom of the foundation pit, tying the steel bars of the foundation beam (11) and the bottom steel bars of the pier (12), reserving connection ports at corresponding connection positions, and pouring concrete into the foundation beam (11); when the concrete strength of the foundation beam (11) reaches the designed strength, backfilling the foundation pit, tying the steel bars of the upper area of ​​the pier (12), and casting the pier (12) with formwork to ensure one-time continuous pouring and forming; Step S320, assembling the drainage block (2); When the concrete strength of the pier (12) in the middle of the pier row reaches the design strength, the gravity walls (21) on both sides are hoisted to the assembly position, the non-penetrating steel bars (63) are installed to connect and tighten the pier (12) and the gravity wall (21), and the reserved assembly holes are grouting; the grille walls (22) on both sides are hoisted to the assembly positions above the gravity walls (21) on both sides, the non-penetrating steel bars (63) are installed to connect and tighten the pier (12) and the grille wall (22), and the reserved assembly holes are grouting, and the assembly of the middle guardrail row is completed; The middle barrier assembly and the two side barrier assemblies are assembled in a symmetrical manner on the left and right sides to complete the assembly of the barrier section (2); Step S330, assembling prestressed through-threaded steel bars (61); After all the non-through steel bars (63) are connected, insert the prestressed through threaded steel bars (61) into the reserved holes, apply prestress at both ends and fix them by post-tensioning method, and after inspection, grout the reserved assembly holes; Step S340, assembling the tank guard (3); After the concrete strength of the foundation beam (11) reaches the design requirements, the apron part (3) is assembled, and the apron in front of the dam (31) and the apron behind the dam (32) are assembled in sections; first, the brick paving pieces (33) of the apron in front of the dam (31) or the apron behind the dam (32) are laid, and then the anchor rods (64) are driven into the ditch bed rock mass through the reserved assembly holes, and the assembly section of the diversion wall (4) is reserved above the anchor rods (64) of the apron in front of the dam (31); Step S350, assembling the guide wall; Insert the assembly holes of the bottom wall brick pieces (41) into the upper assembly sections of the anchor rods (64), tighten the anchor rods (64), and assemble the upper wall brick pieces (41) layer by layer to complete the assembly of the guide walls (4) on both sides; Step S360, assembling the wing wall portion; Hoist the bottom wing wall panel (51) to the assembly position, install the non-penetrating steel bars (63) to connect the end buttress (121) and the bottom wing wall panel (51), tighten the non-penetrating steel bars (63), drive the anchor rod (64) from the top of the bottom wing wall panel (51) into the assembly hole, penetrate the brick paving piece (33) of the rear apron (32) of the dam to the ditch bed rock mass, assemble the upper wing wall panel (51) layer by layer, each wing wall panel (51) is connected and tightened to the end buttress (121) through the through steel bars (62), grout the reserved assembly holes, and complete the assembly of the wing walls (5) on both sides; Among all the steps of the above-mentioned on-site construction process, those involving cast-in-place concrete construction must, after the pouring is completed, be subject to thermal insulation and moisture retention maintenance in accordance with specifications in addition to routine maintenance.

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