A reverse construction system for steel structure dam

Abstract

The invention relates to the technical field of steel structure dams, and in particular to a reverse construction system for a steel structure dam, which overcomes the problem that a cofferdam must be built in advance before the dam body can be constructed, shortens the construction process of slope piles and dam foundation piles, and no longer requires the construction of a cap in advance, and does not require all dam foundation piles to be driven in before subsequent construction. A construction platform can be formed under the cooperation of slope piles, dam foundation piles and bridge trusses, and the construction of the steel structure dam from the middle is realized through the construction platform. The upward construction on the construction platform is the positive construction of the steel structure dam, and the downward construction on the construction platform is the reverse construction. After the construction of the construction platform is completed, it can be used as a platform to construct the lower truss of the dam body. After the construction of the lower truss of the dam body is completed, a setting machine constructs the upper truss of the dam body upward through the construction platform, thereby realizing the reverse construction of the entire steel structure dam.

Description

[0001] The invention relates to the technical field of steel structure dams, and in particular to a reverse construction system for steel structure dams.

[0002] The steel structure dam is a new type of water retaining building. The steel structure dam is an overall spatial structure. The dam body is light and tough, has good elasticity, strong earthquake resistance, and is generally arched. The arch is a thrust structure that mainly bears axial pressure. The bending moment in the arch is small and the stress distribution is relatively uniform, which is conducive to exerting the strength of the steel structure material. However, during the construction of the traditional steel structure dam, it is necessary to first build the dam body unit below the steel structure dam. After the construction of the dam body unit below is completed, the steel structure dam is built upward. Conventional dams are built from bottom to top. In order to ensure the safe construction of the dam body below the steel structure dam, it is necessary to pre-build a cofferdam in the valley for interception, and open a diversion hole on the cofferdam to divert the water flow. The construction of the cofferdam is time-consuming and labor-intensive, which not only reduces the construction efficiency of the steel structure dam, but also increases the overall project investment. If the cofferdam is not built in advance, the dam body unit below the steel structure dam cannot be built, and the steel structure dam body cannot be built upward, which increases the difficulty of construction.

[0003] In view of the defects and problems existing in the construction of existing steel structure dams, the present invention provides a reverse construction system for steel structure dams, which overcomes the problem that the cofferdam must be built in advance before the dam body construction can be carried out, shortens the construction process of slope piles and dam foundation piles, and no longer needs to build a cap in advance, and does not need to drive all the dam foundation piles before subsequent construction. A construction platform can be formed with the cooperation of the slope piles, dam foundation piles and bridge trusses, and the construction platform is used to realize the construction of the steel structure dam from the middle, and the upward construction on the construction platform is the positive construction of the steel structure dam. The reverse construction is when the construction platform is constructed downwards. After the construction of the construction platform is completed, it can be used as a platform to construct the lower truss of the dam body. After the construction of the lower truss of the dam body is completed, the erection machine then constructs the upper truss of the dam body upwards through the construction platform, thus realizing the reverse construction of the entire steel structure dam. The bridge truss, the upper truss of the dam body and the lower truss of the dam body are all prefabricated units, which can be hoisted into place for assembly during construction, which significantly improves construction efficiency, reduces construction cost and engineering workload, and utilizes the high strength of the steel itself to achieve the high strength of the overall structure of the steel structure dam.

[0004] The solution adopted by the present invention to solve the technical problem is: a reverse construction method of a steel structure dam, including a stepped cap built on the bank slopes on both sides of the river valley, and also including slope piles, dam foundation piles, bridge trusses, truss pillars, dam body upper trusses and dam body lower trusses, wherein the slope piles are built in the vertical facade of the stepped cap. The dam foundation piles are constructed in the horizontal bottom surface of the stepped pedestal, the truss struts are arranged above the dam foundation piles, and the truss struts are connected to the dam foundation piles through connectors, the bridge trusses are arranged above the truss struts, the bottom of the bridge trusses are connected to the truss struts, the sides of the bridge trusses are connected to the slope piles, a panel is laid above the bridge trusses, so that the bridge trusses form a construction platform, and the dam foundation piles are arranged horizontally and forward in sequence through the construction platform as a road surface, and the bridge trusses are erected, and adjacent bridge trusses are connected by connectors, the lower truss of the dam body is arranged below the bridge truss, there are multiple lower trusses of the dam body, and the lower trusses of the dam body are fixedly mounted on the truss struts from bottom to top, the upper truss of the dam body is arranged above the bridge truss, and the bridge truss is fixedly connected to the upper truss of the dam body and the lower truss of the dam body to form an arched steel structure dam body, and the water-facing surface and the water-receiving surface of the dam body of the steel structure dam are both sealed with water retaining plates.

[0005] The method comprises the following steps: S1, constructing concrete stepped caps on the two bank slopes of the river valley, the erection machine constructs the slope piles in the vertical facade of the stepped cap according to the construction requirements, the erection machine constructs the dam foundation piles in the horizontal bottom surface of the stepped cap according to the construction requirements, and lifts the truss struts to connect the truss struts with the dam foundation piles, the erection machine places the bridge truss on the corresponding slope piles and truss struts of the stepped cap according to the construction requirements, the bridge truss is connected to the slope piles and truss struts through connectors, a panel is laid above the bridge truss to form a construction platform, and the erection machine is carried on the construction platform.

[0006] S2. The erection machine uses the construction platform as the road surface to circulate forward in sequence to drive the dam foundation piles, and construct the dam foundation piles in the river valley. When constructing the dam foundation piles in the river valley, after the construction of the previous section of the dam foundation piles is completed, the truss struts are vertically erected to connect the truss struts with the dam foundation piles to form a combined column pier. The bridge truss is then erected above the truss struts. Adjacent bridge trusses are connected by connectors. The bridge trusses are constructed on both sides of the river valley at the same time, so that adjacent bridge trusses form an arched construction platform.

[0007] S3. After the construction platform is built, the erection machine constructs the lower trusses of the dam body through the construction platform downwards, and installs multiple lower trusses of the dam body on the truss pillars from bottom to top. When the lower trusses of the dam body are all constructed according to the construction requirements, the erection machine hoists the upper trusses of the dam body on the construction platform, assembles and installs the upper trusses of the dam body above the construction platform, and constructs the upper trusses of the dam body. The construction of the steel structure dam starts from the middle through the construction platform. The erection machine assembles and installs the upper trusses of the dam body upwards on the construction platform, which is the forward construction of the steel structure dam. The erection machine assembles and installs the lower trusses of the dam body downwards on the construction platform, which is the reverse construction of the steel structure dam.

[0008] S4. Install water retaining plates on the water-facing and water-receiving sides of the steel structure dam body.

[0009] Furthermore, the truss support is a hollow cylindrical structure, and the upper and lower ends of the support are provided with connecting platforms protruding outward, and are fixedly connected to the corresponding dam foundation piles and bridge trusses by bolts.

[0010] Furthermore, steel strands are preset in the dam foundation piles according to construction requirements, the bottom ends of the steel strands pass downward through the dam foundation piles and are anchored in the bedrock layer below the dam foundation piles, the top ends of the steel strands extend into the truss pillars, pass through the truss pillars, a tensioning machine is used to tension the steel strands, and the tensioned steel strands are passed through the prestressed holes on the fixing plate at the bottom of the bridge truss and are fixed; steel strands are preset in the slope piles according to construction requirements, the inner ends of the steel strands pass inward through the slope piles and are anchored in the bedrock layer on the inner side of the slope piles, the outer ends of the steel strands extend out of the slope piles, a tensioning machine is used to tension them, and the tensioned steel strands are passed through the prestressed holes on the fixing plate on the side of the bridge truss and are fixed.

[0011] Furthermore, the free end of the steel strand is connected with a threaded rod, which passes through the prestressed holes on the truss support and the fixing plate and is fixed to the fixing plate by a nut.

[0012] Furthermore, the bridge trusses are constructed horizontally from the bank slopes on both sides toward the middle of the valley.

[0013] The beneficial effects of the present invention are as follows: the structure is unique, and the construction process of the traditional steel structure dam is changed. A stepped cap with a concrete structure is built on the bank slopes on both sides of the river valley. The vertical facade and the horizontal bottom surface of the stepped cap are respectively built with slope piles and dam foundation piles according to the construction requirements. The bridge trusses at the two ends of the steel structure dam are respectively erected on the dam foundation piles corresponding to the stepped caps on the bank slopes on both sides, and are fixedly connected with the slope piles. With the cooperation of the slope piles, the dam foundation piles and the bridge trusses, the erection machine can sequentially construct the bridge trusses forward to form a construction platform. After the construction of all the construction platforms is completed, the construction of the steel structure dam from the middle is realized through the construction platform. The upward construction on the construction platform is the positive construction of the steel structure dam, and the downward construction of the construction platform is the reverse construction. The construction platform is also a part of the dam body of the steel structure dam. The erection machine can circulate forward on the construction platform in sequence to construct the combined column piers in the river valley and erect the bridge trusses, realizing the reverse construction of the steel structure dam, and can be constructed on the water surface. There is no need to make a cofferdam in advance and then construct the dam body below the steel structure dam, which reduces the construction steps and engineering workload and eliminates The construction of cofferdams or diversion buildings is simplified, saving construction costs; the reverse construction shortens the construction process of slope piles and dam foundation piles, and there is no need to pre-build the cap, and there is no need to drive all the dam foundation piles before subsequent construction. The bridge truss, the dam upper truss and the dam lower truss are all assembled units, which can be hoisted into place and assembled during construction, reducing the amount of engineering. The assembly of the bridge truss, the dam upper truss, the dam lower truss, the slope piles and the dam foundation piles can make the steel structure dam have a strong ability to adapt to terrain and geology after construction. It not only increases force, but also overcomes the problem of pre-interception and diversion during dam construction, thereby improving the overall construction progress of the dam, shortening the overall construction period, ensuring the construction quality of the dam, and reducing the investment in the project; through the cooperation of the steel strands and the fixed plates, the steel strands can apply prestress to the composite column piers, thereby improving the bearing capacity of the composite column piers, thereby increasing the service life of the overall steel structure dam, significantly improving construction efficiency, reducing construction costs and engineering workload, and utilizing the high strength of the steel itself to achieve high strength of the overall structure of the steel structure dam.

[0014] Figure 1 This is one of the structural schematic diagrams of the present invention.

[0015] Figure 2 This is the second structural schematic diagram of the present invention.

[0016] Figure 3 This is the third structural schematic diagram of the present invention.

[0017] Figure 4 This is the fourth structural schematic diagram of the present invention.

[0018] Figure 5 This is the fifth structural schematic diagram of the present invention.

[0019] In the figure: 1-slope piles, 2-dam foundation piles, 3-bridge trusses, 4-stepped caps, 5-dam body lower trusses, 6-dam body upper trusses, 7-truss pillars, 8-bedrock layer, 9-erection machine, 10-dunk hole.

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Embodiment 1, as Figure 1-4 As shown, it includes a stepped pedestal 4 built on the bank slopes on both sides of the river valley, a slope pile 1 is horizontally built in the vertical facade of the stepped pedestal 4, a submerged hole 10 is opened in the bedrock 8 of the slope pile 1, a steel rope is anchored in the submerged hole 10, a dam foundation pile 2 is vertically built in the horizontal bottom surface of the stepped pedestal 4, the dam foundation pile 2 has a submerged hole 10 opened in the bedrock layer 8, a truss support 7 is vertically arranged above the dam foundation pile 2, and the bridge trusses 3 at both sides of the steel structure dam are arranged above the dam foundation piles of the stepped pedestal 4, the bottom of the bridge truss 3 is fixedly connected to the dam foundation piles on the stepped pedestal 4 by bolts or connecting parts, the side of the bridge truss 3 is fixedly connected to the slope pile 1 by bolts or connecting parts, a panel is laid above the bridge truss 3, so that the bridge truss 3 constitutes a construction platform, and the erection machine 9 can use the construction platform as a road surface to circulate horizontally forward in sequence to carry out river After the dam foundation piles are constructed in the valley, the truss pillars 7 are vertically connected to the dam foundation piles, and the bridge trusses 3 are erected. Adjacent bridge trusses 3 are connected to each other by connecting pieces, so that the adjacent bridge trusses gradually form a construction platform with an arched structure. After the construction platform is completed, a lower dam body truss 5 is arranged downward through the construction platform. There are multiple lower dam body trusses 5. The lower dam body trusses 5 are arranged on the truss pillars 7 from bottom to top. The lower dam body trusses 5 are fixed on the truss pillars 7 by connecting pieces, and the topmost lower dam body truss 5 is fixedly connected to the bridge truss 3. An upper dam body truss 6 is arranged upward through the construction platform. The upper dam body truss 6 is fixedly connected to the bridge truss 3. The bridge truss 3 is fixedly connected to the upper dam body truss 6 and the lower dam body truss 5, forming an arched steel structure dam body. Water retaining plates are sealed on the water-facing and water-receiving surfaces of the steel structure dam body.

[0022] When the reverse construction method is used for the construction of steel structure dam, the following steps are included:

[0023] S1. The technical personnel survey the slopes on both sides of the river valley to determine the construction positions of the concrete stepped pedestals 4 on both sides of the river valley. After determining the positions, the concrete stepped pedestals 4 are built on the slopes on both sides of the river valley. The concrete stepped pedestals 4 are connected to the slopes as a whole through anchor rods. The erection machine 9 builds the slope piles 1 in the vertical facade of the stepped pedestal 4 according to the construction requirements. The erection machine builds the dam foundation piles 2 in the horizontal bottom surface of the stepped pedestal 4 according to the construction requirements, and lifts the truss struts 7 to connect the truss struts 7 with the dam foundation piles 2. The erection machine places the bridge truss 3 on the corresponding slope piles 1 and truss struts 7 of the stepped pedestal 4 according to the construction requirements. The bridge truss 3 is connected to the slope piles and truss struts through connectors. A panel is laid above the bridge truss 3 to form a construction platform, and the construction platform can carry the erection machine 9.

[0024] S2, such as Figure 2-3 As shown, the erection machine 9 uses the construction platform as a road surface to circulate forward in sequence to drive the dam foundation piles 2 to construct the dam foundation piles 2 in the river valley. When constructing the dam foundation piles in the river valley, after the construction of the previous section of the dam foundation piles 2 is completed, the truss struts 7 are vertically erected to connect the truss struts 7 with the dam foundation piles 2 to form a combined column pier. The truss struts 7 constructed above the dam foundation piles 2 in the river valley are all on the same horizontal plane. The bridge trusses 3 are then erected above the truss struts 7. Adjacent bridge trusses 3 are connected by connecting pieces. The bridge trusses 3 and the dam body lower trusses 5 are constructed on both sides of the valley at the same time. The construction is carried out from the stepped abutments on both sides to the middle of the valley in the horizontal direction, so that the adjacent bridge trusses 3 gradually form a construction platform with an arch structure.

[0025] S3, such as Figure 5 As shown, after the construction of the construction platform formed by the bridge truss 3 is completed, the erecting machine 9 constructs the lower truss 5 of the dam body downwards through the construction platform, and fixes multiple lower trusses 5 of the dam body on the truss pillars 7 from bottom to top, and performs reverse construction of the steel structure dam. When the lower trusses 5 of the dam body are all constructed according to the construction requirements, the erecting machine 9 hoists the upper truss 6 of the dam body on the construction platform, assembles and installs the upper truss 6 of the dam body above the construction platform, and performs construction of the upper truss 6 of the dam body. The construction of the steel structure dam is started from the middle through the construction platform. The erecting machine assembles and installs the upper truss of the dam body upwards on the construction platform, which is the forward construction of the steel structure dam, and the erecting machine assembles and installs the lower truss of the dam body downwards on the construction platform, which is the reverse construction of the steel structure dam.

[0026] S4. Install water retaining plates on the water-facing and water-receiving sides of the steel structure dam body.

[0027] The steel structure dam is constructed using the reverse construction method, which changes the construction process of the traditional steel structure dam. A stepped cap with a concrete structure is built on the slopes on both sides of the river valley. The vertical facade and horizontal bottom surface of the stepped cap are respectively built with slope piles and dam foundation piles according to the construction requirements. The bridge trusses on both sides of the steel structure dam are respectively erected on the dam foundation piles corresponding to the stepped caps on the slopes on both sides, and are fixedly connected with the slope piles. With the cooperation of the slope piles, dam foundation piles and bridge trusses, the erection machine can sequentially construct the bridge trusses forward to form a construction platform. The entire construction platform After the construction is completed, the construction of the steel structure dam is realized from the middle through the construction platform. The upward construction on the construction platform is the positive construction of the steel structure dam, and the downward construction on the construction platform is the reverse construction. The construction platform is also a part of the steel structure dam body. The erection machine can circulate forward on the construction platform in sequence to construct the combined column piers in the river valley and erect the bridge truss, realizing the reverse construction of the steel structure dam. Construction can be carried out on the water surface. There is no need to make a cofferdam in advance and then construct the dam body below the steel structure dam, which reduces the construction steps and engineering workload. The construction of cofferdams or diversion buildings has been cancelled, saving construction costs; the reverse construction has shortened the construction process of slope piles and dam foundation piles, and there is no need to pre-build abutments, and there is no need to drive all the dam foundation piles before subsequent construction. The bridge trusses, the upper trusses of the dam body and the lower trusses of the dam body are all assembled units, which can be hoisted into place and assembled during construction, reducing the amount of work. The assembly of the bridge trusses, the upper trusses of the dam body, the lower trusses of the dam body, the slope piles and the dam foundation piles can make the steel structure dam have a strong adaptability to the terrain and geology after the construction is completed. It not only improves the capacity, but also overcomes the problem of pre-interception and diversion during dam construction, thereby improving the overall construction progress of the dam, shortening the overall construction period, ensuring the construction quality of the dam, and reducing the investment in the project; through the cooperation of the steel strands and the fixed plates, the steel strands can apply prestress to the composite piers, thereby improving the bearing capacity of the composite piers, thereby increasing the service life of the overall steel structure dam, significantly improving construction efficiency, reducing construction costs and engineering volume, and utilizing the high strength of the steel itself to achieve high strength of the overall structure of the steel structure dam.

[0028] Example 2: A reverse construction system for a steel structure dam in this embodiment is described with the differences from Example 1 as the center.

[0029] In this embodiment, the truss support 7 is a hollow cylindrical structure, and outwardly protruding connecting platforms are provided at the upper and lower ends of the truss support 7. The connecting platform at the upper end of the truss support 7 is fixedly connected to the bridge truss 3 by bolts or connecting parts, and the connecting platform at the lower end of the truss support 7 is fixedly connected to the dam foundation piles 2 by bolts or connecting parts.

[0030] Example 3: A reverse construction system for a steel structure dam in this embodiment is described centering on the differences from Example 2.

[0031] In this embodiment, a steel strand is preset in the dam foundation pile 2, and the bottom end of the steel strand passes through the dam foundation pile and is anchored in a submerged hole 10 in the bedrock layer 8, and the top of the steel strand extends into the truss support 7, passes through the truss support, and a tensioning machine is used to tension the steel strand, and the tensioned steel strand is passed through the prestressed hole on the fixing plate at the bottom of the bridge truss 3 and fixed; a steel strand is preset in the slope pile 1, and the inner end of the steel strand passes inwardly through the slope pile and is anchored in a submerged hole 10 in the bedrock layer 8 on the inner side of the slope pile, and the outer end of the steel strand extends out of the slope pile 1, and a tensioning machine is used to tension it, and the tensioned steel strand is passed through the prestressed hole on the fixing plate on the side of the bridge truss and fixed. Under the action of the steel strand, the bridge truss can be prestressed and tensioned, making the bridge truss more stable, further improving the stability of the steel structure dam.

[0032] Example 4: A reverse construction system for a steel structure dam in this embodiment is described centering on the differences from Example 3.

[0033] In this embodiment, a threaded rod is connected to the free end of the steel strand. After the steel strand is tensioned using a tensioning machine, the threaded rod passes through the prestressed holes of the fixed plates on the side and bottom of the bridge truss, and is fixed to the fixed plates by matching nuts. The mutual cooperation between the threaded rod and the nut can make the steel strand more stably fixed to the fixed plate.

[0034] Example 5, a reverse construction system of a steel structure dam in this embodiment is described centering on the differences from Example 2.

[0035] In this embodiment, a casing is provided on the outside of the steel strand. When concrete is poured on the slope piles and the dam foundation piles, the steel strand can be prestressed in the casing to avoid the situation where the steel strand cannot be prestressed because it is fixed in the concrete after the concrete is poured. After the steel strand is prestressed, the casing is filled with concrete.

[0036] Example 6: A reverse construction system for a steel structure dam in this embodiment is described with the differences from Example 1 as the center.

[0037] In this embodiment, a transition frame is provided in the slope pile, and the transition frame is mounted on the steel cage in the slope pile. The top of the transition frame is fixedly connected to the truss support. The construction personnel can lower the transition frame to different depths in the dam foundation pile according to different riverbed terrains to make the heights of the truss supports consistent. The transition frame is then fixedly connected to the steel cage in the dam foundation pile, and then the dam foundation pile is poured with concrete. Under the action of the transition frame, the tops of the supports can be located on the same horizontal plane, so that the truss is fixed horizontally, avoiding the situation where the heights of the supports are inconsistent due to the rugged riverbed terrain.

[0038] Example 7, a reverse construction system of a steel structure dam in this embodiment is described centering on the differences from Example 1.

[0039] In this embodiment, a sub-dam body is provided on the inner side of the steel dam body. The sub-dam body has the same structure as the steel dam body, and the sub-dam body and the steel dam body are constructed in a stepped manner.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reverse construction method for a steel structure dam, comprising building a stepped cap on the bank slopes on both sides of a river valley, characterized in that: It also includes slope piles, dam foundation piles, bridge trusses, truss pillars, upper trusses of the dam body and lower trusses of the dam body. The slope piles are built in the vertical facade of the stepped platform. The dam foundation piles are constructed in the horizontal bottom surface of the stepped pedestal, the truss struts are arranged above the dam foundation piles, and the truss struts are connected to the dam foundation piles through connectors, the bridge trusses are arranged above the truss struts, the bottom of the bridge trusses are connected to the truss struts, the sides of the bridge trusses are connected to the slope piles, a panel is laid above the bridge trusses, so that the bridge trusses form a construction platform, and the dam foundation piles are arranged horizontally and forwardly in sequence through the construction platform as a road surface, and the bridge trusses are erected, and adjacent bridge trusses are connected by connectors, the lower trusses of the dam body are arranged below the bridge trusses, there are multiple lower trusses of the dam body, and the lower trusses of the dam body are fixedly sleeved on the truss struts from bottom to top, the upper trusses of the dam body are arranged above the bridge trusses, and the bridge trusses are fixedly connected to the upper trusses of the dam body and the lower trusses of the dam body to form an arched steel structure dam body, and the water-facing surface and the water-receiving surface of the dam body of the steel structure dam are both sealed with water retaining plates, including the following steps: S1. Concrete stepped caps are constructed on the bank slopes on both sides of the valley. The erection machine constructs the slope piles in the vertical elevation of the stepped cap according to the construction requirements. The erection machine constructs the dam foundation piles in the horizontal bottom surface of the stepped cap according to the construction requirements, and lifts the truss pillars to connect the truss pillars with the dam foundation piles. The erection machine places the bridge truss on the corresponding slope piles and truss pillars of the stepped cap according to the construction requirements. The bridge truss is connected to the slope piles and truss pillars through connectors. A panel is laid above the bridge truss to form a construction platform, and the erection machine is carried on the construction platform; S2. The erection machine drives the dam foundation piles forward in a circular motion in sequence through the construction platform as the road surface, and constructs the dam foundation piles in the river valley. When constructing the dam foundation piles in the river valley, after the construction of the dam foundation piles in the previous section is completed, the truss struts are vertically erected, so that the truss struts are connected with the dam foundation piles to form a combined column pier, and then the bridge truss is erected above the truss struts. Adjacent bridge trusses are connected by connecting pieces. The bridge trusses are constructed on both sides of the river valley at the same time, so that the adjacent bridge trusses form an arched construction platform; S3. After the construction platform is completed, the erection machine goes down through the construction platform to construct the lower truss of the dam body, and installs multiple lower trusses of the dam body on the truss pillars from bottom to top. When the lower trusses of the dam body are all constructed according to the construction requirements, the erection machine hoists the upper truss of the dam body on the construction platform, assembles and installs the upper truss of the dam body above the construction platform, and constructs the upper truss of the dam body. The construction of the steel structure dam starts from the middle through the construction platform. The erection machine assembles and installs the upper truss of the dam body upward on the construction platform, which is the positive sequence construction of the steel structure dam. The erection machine assembles and installs the lower truss of the dam body downward on the construction platform, which is the reverse sequence construction of the steel structure dam. S4. Install water retaining plates on the water-facing and water-receiving sides of the steel structure dam body.

2. The reverse construction method of a steel structure dam according to claim 1, characterized in that: The truss support is a hollow cylindrical structure, and the upper and lower ends of the truss support are provided with connecting platforms protruding outward, and are fixedly connected to the corresponding dam foundation piles and bridge trusses by bolts.

3. The reverse construction method of a steel structure dam according to claim 2, characterized in that: Steel strands are preset in the dam foundation piles according to construction requirements. The bottom end of the steel strand passes downward through the dam foundation piles and is anchored in the bedrock layer below the dam foundation piles. The top end of the steel strand extends into the truss support and passes through the truss support. A tensioning machine is used to tension the steel strand, and the tensioned steel strand is passed through the prestressed hole on the fixing plate at the bottom of the bridge truss and fixed. Steel strands are preset in the slope piles according to construction requirements. The inner end of the steel strand passes inward through the slope piles and is anchored in the bedrock layer on the inner side of the slope piles. The outer end of the steel strand extends out of the slope pile and is tensioned by a tensioning machine. The tensioned steel strand is passed through the prestressed hole on the fixing plate on the side of the bridge truss and fixed.

4. The reverse construction method of a steel structure dam according to claim 3, characterized in that: The free end of the steel strand is connected with a threaded rod, which passes through the prestressed holes on the truss support and the fixing plate and is fixed to the fixing plate by a nut.

5. The reverse construction method of a steel structure dam according to claim 1, characterized in that: The bridge trusses are built horizontally from the slopes on both sides to the middle of the valley.

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