A comprehensive construction system for dam, road and bridge of steel structure dam

Abstract

The invention discloses a dam, road and bridge construction system of a steel structure dam, comprising a steel structure dam body, reinforced concrete stepped slope caps are constructed on the bank slopes on both sides of the steel structure dam body, slope piles and supporting piers are respectively constructed on the vertical facade and horizontal bottom surface of the slope cap according to design requirements, and the steel structure dam body comprises a bridge truss, a supporting column pier group and a dam body truss; the invention utilizes the driving force of social development, combines the permanent and temporary combination technology, increases the versatility of dam construction, uses the upper bridge truss as a temporary construction platform for dam body construction and a temporary road for transporting construction materials, and is connected with the dam body truss as a permanent structure of the dam body during the dam body construction process, realizes the comprehensive utilization of the dam road and bridge, solves the problem of pre-interception and diversion during dam body construction, reduces the engineering volume, shortens the long construction period, and reduces the construction cost, thereby solving the problem of complicated construction steps, large engineering volume and high cost during the construction of the existing dam body.

Description

Technical Field

[0001] The invention belongs to the technical field of dam structure improvement of water conservancy and hydropower engineering, and in particular relates to a comprehensive construction system of dams, roads and bridges of a steel structure dam. Background Art

[0002] A dam is a water-retaining structure that intercepts water flow in rivers and channels to raise water levels or regulate flow. my country is the country with the most dams, the largest scale, the most complete types and the most experience in the world, but basically uses the dam types that already exist in foreign countries, mainly including: gravity dam, earth-rock dam and arch dam. Recently, my country has launched rubber-poor material dams and rockfill concrete dams with remarkable achievements, but the basic materials are still within the scope of cement, sand and gravel as the main body. Therefore, the dam types with new forms, new materials and new construction methods proposed by my country have become a necessity for our major country.

[0003] With the development of economy and the progress of society, my country now has the economic and technical conditions to build steel structure dams. If the traditional method is to build a dam on a U-shaped or V-shaped valley, it is necessary to first excavate the foundation, then build a cofferdam on the dam, and also dig a diversion hole and build a construction fence to build the dam body from bottom to top. The fence needs to be removed later to ensure the smooth progress of the project construction. The project is large and the construction is inconvenient. Moreover, when constructing in winter, summer, or on freezing, snowing, or rainy days, corresponding measures must be taken to avoid climate impacts and ensure construction quality and progress. In the process of building the dam body, many permanent and temporary roads need to be built on the construction site to meet the needs of transporting construction materials to the construction site, further increasing the cost of steel structure dam construction. Summary of the invention

[0004] In view of the defects and problems existing in the existing dam body construction and utilizing the driving force of social development, the present invention provides a comprehensive construction system of dams, roads and bridges for steel structure dams, which utilizes the permanent and temporary combination technology to increase the versatility of dam construction, and uses the upper bridge truss as a temporary construction platform for dam body construction and a temporary road for transporting construction materials, and is connected with the dam body truss as a permanent structure of the dam body during the dam body construction process, thereby realizing the comprehensive utilization of dam roads and bridges, solving the problem of pre-interception and diversion during dam body construction, reducing the amount of engineering work, shortening the construction period, and reducing the construction cost, thereby solving the problem of complicated construction steps, large amount of engineering work and high cost during the existing dam body construction.

[0005] The solution adopted by the present invention to solve its technical problems is: a comprehensive construction system of dam, road and bridge of a steel structure dam, including a steel structure dam body, reinforced concrete stepped slope caps are built on the bank slopes on both sides of the steel structure dam body, and slope piles and supporting piers are built on the vertical facades and horizontal bottom surfaces of the slope caps according to design requirements. The steel structure dam body includes a bridge truss, a supporting column pier group and a dam body truss. The bridge truss includes a plurality of bridge units that are sequentially erected and connected together from the bank slopes on both sides of the river channel to the middle, and the bridge units at the edges of both ends of the bridge truss are respectively located on the supporting piers of the corresponding slope caps on the bank slopes on both sides, and are fixedly connected to the slope piles and supporting piers on the slope caps; the bridge units of the bridge truss located above the river channel are all fixedly supported above the riverbed by a group of supporting column pier groups, and the supporting column pier groups for fixing and supporting the bridge units are all fixed on the riverbed before the bridge units are erected; the dam body truss includes a plurality of groups of dam body trusses A dam truss group is provided, and each supporting column pier group below the bridge unit body above the riverbed is provided with a group of dam body truss groups, the dam body truss group includes a plurality of dam body units in the form of truss structures fixed together vertically from bottom to top, and the dam body unit body at the top of the dam body truss group is fixedly connected to the bottom of the bridge unit body; a panel is laid on each bridge unit body of the bridge truss, and the panel serves as a construction platform for the next supporting column pier group, bridge unit body and dam body truss group; the dam body units of the dam body truss groups adjacent to the slope caps on both sides of the slope extend outward to the supporting piers of the slope caps, and are fixedly connected to the slope piles on the slope caps, and two adjacent dam body truss groups in the dam body truss are fixedly connected to each other, thereby forming a combined steel structure dam body with an arched stacked connection structure, and water retaining plates are provided on the dam body truss groups located on the water-facing and water-retaining sides of the steel structure dam body, and each unit body and the water retaining plate are fixedly connected to form a steel structure dam body with a curved water-facing surface.

[0006] The support column pier group includes multiple support column piers, which include reinforced concrete structure foundation piles fixed in the riverbed. The top of the foundation pile protrudes from the riverbed and is provided with a connecting platform. The connecting platform is fixed with a pillar, and the top of the pillar is connected to the bridge unit body.

[0007] The connecting platforms of the supporting column piers in each group of supporting column piers are connected together to form a dam bottom pedestal, and the dam body unit body at the bottom of each group of dam body truss groups is fixed on the dam bottom pedestal through connecting parts.

[0008] The connecting parts are embedded parts of the dam bottom pedestal or pre-set parts on the dam body unit body.

[0009] The pillar is a hollow cylindrical structure with openings at both ends. Both ends of the pillar are provided with connecting platforms protruding outwards, and are fixedly connected to the corresponding pile foundation connecting platforms and the bridge truss unit body by bolts.

[0010] The top ends of the connection platforms of each combined pile pier foundation are on the same horizontal plane.

[0011] The panels on the bridge unit bodies are connected to the panels of adjacent bridge unit bodies to form a vehicle passage.

[0012] Each bridge unit of the bridge truss and each group of dam trusses of the dam truss are provided with an installation number.

[0013] Parts numbers are provided on the parts of the bridge unit body and the dam unit body of each dam body truss group.

[0014] Beneficial effects of the invention: The invention provides a comprehensive construction system of a dam, road and bridge of a steel structure dam, which has a unique structure and includes a steel structure dam body. Stepped slope caps with reinforced concrete structures are built on the bank slopes on both sides of the steel structure dam body. Slope piles and supporting piers are built on the vertical facades and horizontal bottom surfaces of the slope caps according to design requirements. The steel structure dam body includes a bridge truss, a dam body truss and supporting column piers. The left and right ends of the bridge truss are horizontally erected on the supporting piers of the slope caps corresponding to the bank slopes on both sides according to design requirements, and are fixedly connected to the slope piles on the slope caps, and the bottom of the bridge truss is According to the design requirements, multiple composite pile piers are built on the riverbed, and the composite pile piers located directly below the bridge truss are fixedly connected to the upper bridge truss to support the bridge truss. A panel is laid on the bridge truss to serve as a temporary construction platform for the dam body construction and a temporary road for transporting construction materials. The bridge truss is used as a construction platform for the construction of the steel structure dam body, and construction can be carried out on the water surface. There is no need to cofferdam and throttle the river channel where the steel structure dam body is to be built. The construction steps are simple, the engineering volume is small, the construction cost is low, the construction of cofferdams and diversion buildings is cancelled, and the engineering investment cost is saved;

[0015] The dam body truss includes a dam body truss group, which includes a plurality of truss structure dam body units fixed together vertically from bottom to top, and multiple dam body truss groups are provided below and on both front and rear sides of the bridge truss along the erection direction of the bridge truss. Two adjacent dam body truss groups are fixedly connected to each other, and the units adjacent to the pillars or bridge trusses in each dam body truss group are respectively fixedly connected to the adjacent pillars or bridge trusses, so that the bridge truss is connected to the dam body truss as a permanent structure of the dam body during the construction of the dam body, thereby forming a combined steel structure dam body with an arched stacked connection structure, which changes the procedures and process flow of existing steel structure dam construction, reduces the use of dam body construction materials, and reduces construction costs.

[0016] Moreover, water retaining plates are provided on the dam truss groups located on the water-facing and water-retaining sides of the steel structure dam body, and each unit body and the water retaining plates are fixedly connected to form a steel structure dam body with a curved water-facing surface, which is convenient for construction; and each dam body unit body of the dam body truss can be transported in the form of factory assembly or on-site assembly, and can be hoisted and assembled at a fixed point after being transported to the site, thereby reducing the amount of engineering work, shortening the construction period, and reducing the construction cost, thereby solving the problem of complicated construction steps, large amount of engineering work and high cost during the construction of the existing dam body; and the on-site assembly of each dam body unit enables the completed steel structure dam to have a strong ability to adapt to the terrain and geological environment, thereby adapting to the construction of dam bodies under various complex terrain and geological conditions, and increasing the multifunctional comprehensive utilization of dams, roads and bridges in dam construction.

[0017] Taking advantage of the driving force of social development, the present invention provides a comprehensive construction system of dams, roads and bridges for steel structure dams. The system utilizes the permanent and temporary combination technology to increase the versatility of dam construction. The upper bridge truss is used as a temporary construction platform for dam body construction and a temporary road for transporting construction materials. During the dam body construction process, it is connected with the dam body truss as a permanent structure of the dam body, thus realizing the comprehensive utilization of dam roads and bridges, solving the problem of pre-interception and diversion during dam body construction, reducing the engineering workload, shortening the construction period, and reducing the construction cost, thereby solving the problem of complicated construction steps, large engineering workload and high cost during the existing dam body construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structure reference diagram of the present invention.

[0019] Figure 2 It is a schematic diagram of the steel dam structure of the present invention.

[0020] Figure 3 It is a schematic diagram of the bridge truss structure of the present invention.

[0021] Figure 4 It is a schematic diagram of the construction of the dam body truss group of the present invention.

[0022] Figure 5 It is a schematic diagram of the support column structure of the present invention.

[0023] Figure 6 It is a schematic diagram of the installation position of the foundation pile steel cylinder of the present invention.

[0024] Figure 7 It is a schematic diagram of the installation position of the pile reinforcement cage of the present invention.

[0025] Figure 8 It is a schematic diagram of the prestressed construction of the support column pier of the present invention.

[0026] Fig. 9 It is a schematic diagram of the steel structure dam of the present invention receiving the impact of water flow.

[0027] Fig.10 It is a schematic diagram of the three-dimensional structure of the pillar of the present invention.

[0028] Fig.11 It is one of the reference drawings of the construction process of the bridge unit body of the present invention.

[0029] Numbers in the figure: 1 is the steel dam body, 11 is the bridge truss, 111 is the bridge unit, 112 is the panel, 12 is the dam body truss, 121 is the dam body truss group, 1211 is the dam body unit, 13 is the supporting column pier, 131 is the foundation pile, 132 is the pillar, 1321 is the connecting platform, 1322 is the baffle, 1323 is the prestressed hole, 134 is the steel cage, 135 is the mold pipe, 136 is the anchor hole, 14 is the dam body cap, 21 is the slope, 22 is the riverbed, 23 is the rock layer, 3 is the slope cap, 31 is the slope pile, 32 is the supporting pier, 4 is the erection machine, and 5 is the steel strand. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Example 1

[0032] This embodiment provides a comprehensive construction system of dam, road and bridge of steel structure dam, such as Figure 1-5 As shown, the dam comprises a steel structure dam body 1, and reinforced concrete stepped slope caps 3 are built on the bank slopes 21 on both sides of the steel structure dam body 1. Fig.11 As shown, the vertical facade and horizontal bottom surface of the slope cap 3 are respectively constructed with slope piles 31 and support piers 32 according to design requirements. The steel structure dam body 1 includes a bridge truss 11, a dam body truss 12 and a support column pier 13.

[0033] like Figure 2 As shown, the bridge truss 11 includes a plurality of bridge units 111 sequentially erected and connected together from the banks on both sides of the river channel to the middle, and the bridge units 111 at the left and right edges of the bridge truss 11 are fixed units, and a plurality of bridge units 111 between the two fixed units that connect the two fixed units together are connecting units, and the bridge units 111 at the left and right edges of the bridge truss 11 are respectively located on the supporting piers 32 of the slope caps 3 corresponding to the two bank slopes, and are fixedly connected to the slope piles 31 and the supporting piers 32 on the slope caps 3, and the two fixed units are horizontally fixedly connected by a plurality of connecting units, thereby forming an arched truss structure bridge truss 11.

[0034] The bridge unit bodies 111 of the bridge truss 11 located above the riverbed 22 are all fixedly supported above the riverbed 22 by a group of supporting column piers, and the supporting column pier groups used to fix the bridge unit bodies 111 are all fixed on the riverbed before the corresponding bridge unit bodies are erected, and the supporting column pier groups include 4 supporting column piers 13, and the setting positions of the 4 supporting column piers 13 are all fixed according to the requirements of the drawings; the supporting column piers 13 include reinforced concrete structure foundation piles 131 fixed in the riverbed 22, the top of the foundation pile 131 protrudes from the riverbed, and is provided with a connecting platform, and the top of the connecting platform of each combined pile pier foundation is on the same horizontal plane, and a pillar 132 is fixed on the connecting platform, and the top of the pillar 132 is connected to the bridge unit body.

[0035] The dam body truss 12 includes a plurality of dam body truss groups 121, and each supporting column pier group below the bridge unit body 111 located above the riverbed is provided with a dam body truss group 121, the dam body truss group 121 includes a plurality of truss structure dam body units 1211 fixed together vertically from bottom to top, the main bodies of the dam body units 1211 are fixed together with the pillars 132 of the supporting column piers 13 in the adjacent supporting column pier groups; and the dam body units 1211 at the top of the dam body truss group 121 are fixedly connected to the bottom of the bridge unit body 111; the dam body units of the dam body truss groups adjacent to the slope piers on both sides of the dam body truss extend outward to the supporting piers of the slope piers, and are fixedly connected to the slope piles on the slope piers, and the two adjacent dam body truss groups in the dam body truss are fixedly connected to each other; each bridge unit body of the bridge truss 11 is paved with a panel 112, the panel 112 serves as a construction platform for the next supporting column pier group, bridge unit body and dam body truss group, and the panel on the bridge unit body is connected with the panel of the adjacent bridge unit body to form a vehicle passage; the construction sequence of the supporting column pier group, the bridge unit body and the dam body truss group is to first construct the supporting column pier group according to the drawings, then hoist and install the corresponding bridge unit body to the corresponding supporting column pier group for fixing, and connect the hoisted bridge unit body with the adjacent installed bridge unit body, and then use construction machinery, such as: erection machine 4 to construct the dam body truss group below the bridge unit body, and finally lay the panel 112 on the bridge unit body 111 above the completed dam body truss group, and move the construction machinery to the bridge unit body 111 with the new panel laid, and then continue to construct the next supporting column pier group, bridge unit body and dam body truss group, specifically:

[0036] like Figure 3 , Figure 4 and Fig.11As shown, firstly, the first span bridge unit 111, i.e., the fixed unit, at one end of the bridge truss 11 is installed on the corresponding side slope pedestal 3 according to the design requirements, and then a panel 112 is laid on the bridge unit 111, and the panel 112 is used as a construction platform for the next bridge unit; then, the erection machine 4 is transported and moved to the panel of the bridge unit 111, and the erection machine 4 is operated to build a supporting column pier group on the riverbed within the radiation radius of the erection machine cantilever according to the design requirements according to the requirements of the drawings. After the support column pier group is built, the erection machine is operated to install the second span bridge unit 111 on the supporting column pier group outside the first span bridge unit 111 according to the design requirements, and after it is fixedly connected with the bridge unit of the adjacent span, the supporting column pier group under the second span bridge unit 111 is fixedly lifted and assembled according to the requirements of the drawings. After the dam truss group under the second span bridge unit 111 is assembled, the second span bridge unit 111 is laid. The panel is operated and the erection machine 4 is moved to the panel of the second span bridge unit 111, and the third span bridge unit 111 is constructed according to the requirements of the drawings. After the construction of the third span bridge unit 111 is completed, the erection machine 4 is operated and moved to the panel of the third span bridge unit 111 to construct the fourth span bridge unit 111, and this is repeated until the bridge units 11 of the bridge trusses 11 on both sides of the river are connected to form an arched truss structure bridge truss with a road on the top, which is used as a construction platform for the later steel structure dam body panel and other parts. The dam body truss groups under the bridge truss are fixedly connected to each other to form a combined steel structure dam body 1 with an arched stacked connection structure, and the dam body truss groups located on the water-facing side and the back-water side of the steel structure dam body are provided with water retaining plates, and the water retaining plates are fixedly sealed by sealing rubber, and the units and the water retaining plates are fixedly connected to form a steel structure dam body with a curved water-facing side, and the dam body is light and tough, has good elasticity, strong earthquake resistance, and as Fig. 9As shown, when the water-facing surface of the steel dam body 1 is impacted by water flow, since the dam body is arched, the steel dam body 1 will disperse the impact force of the water flow to the bank slopes 21 on both sides, thereby reducing the impact force of the water flow on the steel dam body 1 and improving the service life of the steel dam body 1; and when the steel dam comprehensive construction system provided by this embodiment is constructed, the upper bridge truss is used as a temporary construction platform for dam body construction and a temporary road for transporting construction materials. The next support column pier group, bridge unit body and dam body truss group can be constructed on the panel of the bridge unit body 111 where the bridge truss has been completed, and during the construction of the dam body, the upper bridge truss is connected to the dam body truss as a permanent structure of the dam body, and the panel on the bridge truss It replaces roads and construction platforms, so that the steel dam body can be constructed on the water surface without cofferdam throttling. The construction steps are simple, the engineering volume is small, and the construction investment cost of cofferdams and diversion buildings is saved; and the dam body units of the dam body truss can be transported in the form of factory assembly or on-site assembly, and can be hoisted and assembled at fixed points after being transported to the site, which reduces the engineering volume, shortens the construction period, and reduces the construction cost, thereby solving the problem of complicated construction steps, large engineering volume and high cost during the construction of the existing dam body; and the on-site assembly of each dam body unit makes the completed steel structure dam have a strong ability to adapt to the terrain and geological environment, so as to adapt to the construction of dam bodies under various complex terrain and geological conditions.

[0037] Example 2

[0038] The difference between Example 2 and Example 1 is that the connecting platforms of the supporting column piers in each group of supporting column piers are connected together to form a dam bottom pedestal, and the dam body unit bodies at the bottom of each group of dam body truss groups are fixed to the dam bottom pedestal through connecting parts, and the connecting parts are embedded parts of the dam bottom pedestal or pre-set parts on the dam body unit bodies, thereby further enhancing the fixing strength of the steel structure dam body.

[0039] Example 3

[0040] The difference between Example 3 and Example 2 is that Fig.10 As shown, the pillar 132 is a hollow cylindrical structure with openings at both ends. The upper and lower ends of the pillar are provided with connecting platforms 1321 protruding outward, and are fixedly connected to the corresponding pile foundation connecting platforms and the bridge truss unit body by bolts. The cylindrical pillar 132 can not only provide the required supporting force for the bridge truss 11, but also has a lower cost compared with solid columns.

[0041] Example 4

[0042] The difference between Example 4 and Example 3 is that an installation number is provided on each bridge unit of the bridge truss and each dam truss group of the dam truss, so as to facilitate on-site determination of whether the numbers of the bridge units and dam truss groups to be lifted are the same as the numbers of the parts to be lifted in the construction drawings when the bridge units and dam truss groups are lifted and assembled at a fixed point; and part numbers are also provided on the parts of the bridge units and the dam units of each group of dam truss groups, so that when the bridge units and the dam units of the dam truss groups are assembled on-site, it is convenient for operators to identify and confirm the parts of each unit according to the numbers.

[0043] Example 5

[0044] The difference between Example 5 and Example 4 is that each supporting column pier in the supporting column pier group is provided with prestress during construction.

[0045] like Fig.10 and Figure 6-8 As shown, the upper end opening of the pillar 132 is blocked with a baffle 1322, and two prestressed holes 1323 are opened on the baffle 1322 according to the design and construction requirements. The support column 13 includes a pillar 132 and a reinforced concrete structure foundation pile 131. The pillar 132 is a hollow cylindrical structure with openings at both ends. The upper and lower ends of the pillar 132 are provided with a connecting platform 1321 protruding outward. The upper end opening of the pillar 132 is blocked with a baffle 1322, and a plurality of prestressed holes 1323 are opened on the baffle 1322 according to the design requirements. The foundation pile 131 is fixed in the riverbed 22 according to the design requirements. The top of the pile 131 extends upward out of the riverbed 22, and a connector is preset at the top of the pile 131 to replace the connecting platform. The pillar 132 is fixedly connected to the top of the pile 131. A plurality of steel strands 5 are preset in the pile 131 according to design requirements. The bottom end of the steel strand 5 passes downward through the pile 131 and is anchored in the riverbed rock layer 23 below the pile 131. The top end of the steel strand 5 extends into the pillar 132, passes through the corresponding prestressed hole on the baffle plate at the top of the pillar 132, and uses a tensioner to tension the steel strand 5, and the tensioned steel strand is fixed on the fixing plate to complete the prestressed tensioning, such as Figure 5-8 As shown, the construction steps of the support column pier 13 are as follows:

[0046] S1, the technicians accurately locate the pile position on the riverbed according to the design requirements and place the guide frame. The erection machine lifts the pile steel cylinder and vertically passes through the guide frame and inserts it into the riverbed 22. The erection machine 4 hoists the hammer vibrator to drive the pile steel cylinder into the riverbed;

[0047] S2, when the pile steel cylinder rebounds, the hammer vibrator is replaced with a drilling rig, the drilling rig is used to drill holes to clean the mud and sand in the pile steel cylinder, and the mud suction equipment is used to extract the mud and sand in the pile steel cylinder;

[0048] S3, after the mud and sand in the foundation pile steel cylinder is cleaned, the foundation pile steel cylinder is pulled out, and then the mold tube 135 is installed on the upper end of the steel cage 134 according to the design requirements. The top of the steel cage 134 in the mold tube is preset with a connecting piece to replace the connecting platform, and then the steel cage 134 is lifted by a erection machine, and the steel cage is lowered into the foundation pile steel cylinder hole on the riverbed, and contacts with the bottom of the hole in the foundation pile steel cylinder hole, and the upper end of the steel cage with the mold tube protrudes from the riverbed;

[0049] S4, after the steel cage 134 is lowered, the erection machine hoists the down-the-hole hammer through the steel cage 134 into the bedrock layer, and opens the anchor hole 136 on the bedrock layer inclined outward according to the design requirements;

[0050] S5, according to the design requirements, a number of steel strands 5 equal to the anchor holes are extended into the steel cage, and one end of the steel strands 5 is an anchor end, and the other end is a free end, and the free end is welded with a threaded rod; the anchor end of each steel strand is anchored and fixed in the corresponding anchor hole by using anchoring equipment, and the construction of the pile reinforcement cage is completed;

[0051] S6, the erection machine lifts the pillar 132, vertically connects the pillar 132 with the top of the foundation pile reinforcement cage 134, and fixes the bottom connecting platform of the pillar 132 with the top connecting piece of the reinforcement cage by bolts, and the free end of the steel strand passes through the inside of the pillar, and the top of each steel strand threaded rod is passed through the corresponding prestressed hole at the top of the pillar according to the design requirements, and then a matching nut is installed, and the outer diameter of the nut is larger than the diameter of the prestressed hole, and the threaded rod stretched out of the prestressed hole is used to tension the steel strand, and then the nut is rotated to make it contact with the baffle, so as to fix the prestressed steel strand to the baffle;

[0052] S7, after the prestressing is completed, the construction personnel extend the concrete pouring pipe to the bottom of the dam foundation pile reinforcement cage to pour the concrete. After the concrete pouring is completed, the construction of this support column pier is completed.

[0053] Compared with Example 1, the combined pile piers in this embodiment improve the bearing capacity of the supporting column piers by applying prestress, thereby increasing the service life of the dam body.

Claims

1. A comprehensive construction system of a dam, road and bridge for a steel structure dam, comprising a steel structure dam body, reinforced concrete stepped slope caps are built on the bank slopes on both sides of the steel structure dam body, and slope piles and support piers are built on the vertical facade and horizontal bottom surface of the slope cap according to design requirements, characterized in that: The steel structure dam body includes a bridge truss, a support column pier group and a dam body truss. The bridge truss includes a plurality of bridge units that are sequentially erected and connected together from the bank slopes on both sides of the river channel to the middle, and the bridge units at the edges of both ends of the bridge truss are respectively located on the support piers of the slope caps corresponding to the bank slopes on both sides, and are fixedly connected to the slope piles and support piers on the slope caps; the bridge units of the bridge truss located above the river channel are all fixedly supported above the riverbed by a group of support column pier groups, and the support column pier groups used for fixing and supporting the bridge units are all fixed on the riverbed before the bridge units are erected; the dam body truss includes a plurality of dam body truss groups, and a group of dam body truss groups is provided on the support column pier group below each bridge unit located above the riverbed, and the dam body truss group includes a plurality of truss structure dam body units that are vertically fixed together from bottom to top, and the dam body unit at the top of the dam body truss group is fixedly connected to the bottom of the bridge unit; each bridge unit of the bridge truss is paved with a panel The panel serves as a construction platform for the next supporting column pier group, bridge unit and dam body truss group; the dam body truss and the dam body unit of the adjacent dam body truss groups of the slope caps on both sides of the slope extend outward to the supporting piers of the slope caps, and are fixedly connected to the slope piles on the slope caps, and the two adjacent dam body truss groups in the dam body truss are fixedly connected to each other, thereby forming a combined steel structure dam body with an arched stacked connection structure, and the dam body truss groups located on the water-facing and water-retaining sides of the steel structure dam body are provided with water retaining plates, and each unit and the water retaining plate are fixedly connected to form a steel structure dam body with a curved water-facing surface; the supporting column pier group includes a plurality of supporting column piers, and the supporting column pier includes a reinforced concrete structure foundation pile fixed in the riverbed, the top of the foundation pile protrudes from the riverbed, and is provided with a connecting platform, a pillar is fixed on the connecting platform, and the top of the pillar is connected to the bridge unit; the top of the connecting platform of the foundation pile is on the same horizontal plane; the panel on the bridge unit is connected to the panel of the adjacent bridge unit to form a vehicle passage.

2. The integrated construction system of dam, road and bridge of steel structure dam according to claim 1 is characterized in that: The connecting platforms of the supporting column piers in each group of supporting column piers are connected together to form a dam bottom pedestal, and the dam body unit body at the bottom of each group of dam body truss groups is fixed on the dam bottom pedestal through connecting parts.

3. The integrated construction system of dam, road and bridge of steel structure dam according to claim 2 is characterized in that: The connecting parts are embedded parts of the dam bottom pedestal or pre-set parts on the dam body unit body.

4. The integrated construction system of dam, road and bridge of steel structure dam according to claim 1 is characterized in that: The pillar is a hollow cylindrical structure with openings at both ends. The upper and lower ends of the pillar are provided with connecting platforms protruding outward, and are fixedly connected to the corresponding pile connecting platforms and the bridge truss unit body by bolts.

5. The integrated construction system of dam, road and bridge of steel structure dam according to claim 1 is characterized in that: Each bridge unit of the bridge truss and each group of dam trusses of the dam truss are provided with an installation number.

6. The integrated construction system of dam, road and bridge of steel structure dam according to claim 5 is characterized in that: Parts numbers are provided on the parts of the bridge unit body and the dam unit body of each dam body truss group.

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