Steel lining overflow face structure and construction process thereof

Abstract

The application discloses a steel lining overflow surface structure and a construction process thereof, and relates to the technical field of overflow dam construction, which comprises a weir body, a steel lining is arranged at the overflow surface of the weir body, an upper portion of the weir body is provided with a side wall, a gate pier, an inspection gate and a working gate, the steel lining is arranged between the gate piers, the steel lining is connected with the weir body and the gate piers by connecting steel bars, the weir body is provided with a structure joint, a copper water stop assembly is arranged in the structure joint, the weir body is sequentially provided with a roller compacted concrete area and a normal concrete area from inside to outside, and a horizontal construction joint is formed in the roller compacted concrete area. The steel lining is used to replace the traditional overflow surface material, and the second-stage concrete and the draw mould of the overflow surface are not needed to be poured, the steel lining can be used as the overflow surface formwork, and the construction is rapid and convenient; the steel lining has stronger wear resistance and erosion resistance, has a longer service life, and is simple to maintain in the later period; the steel lining is prefabricated in a factory, has higher manufacturing precision, and is more suitable for the design overflow surface body curve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of overflow dam construction, in particular to a steel lining overflow surface structure and a construction process thereof. BACKGROUND

[0002] The overflow dam is a common dam structure in hydropower engineering, which uses its own overflow surface for discharge, and the problem of high-speed water flow erosion is significant. The traditional overflow surface generally uses high-strength reinforced concrete, which has a large amount of steel bars, and it is difficult to control the sliding-up formwork of the overflow surface. The construction process and technology are complex, and are greatly affected by materials and construction control. The strength and erosion resistance are difficult to guarantee, and the constraints are strong.

[0003] At present, C 28 40 silicon powder concrete is commonly used in actual engineering to replace reinforced concrete as the overflow surface, but there are still the following problems: (1) the silicon powder concrete is difficult to construct, has poor workability, and is difficult to vibrate and compact, and is difficult to collect and smooth the surface, resulting in many honeycomb and rough surfaces, and poor concrete surface flatness; (2) the silicon powder concrete is prone to dry shrinkage cracks, affecting the overall strength and use effect; (3) the early strength of the silicon powder concrete develops very quickly, and the corresponding concrete hydration heat is released very quickly, resulting in high temperature rise in the concrete, which is prone to generate large temperature stress in the concrete. This stress causes stress concentration at the top of the dry shrinkage crack, causing the dry shrinkage crack to expand and extend or even form a through crack, especially in the high-cold region of Tibet where the temperature difference is large, the overflow surface temperature crack is more common, and the post-maintenance is difficult and frequent. (4) the silicon powder particles are fine and light, which is prone to dust and waste during construction. In addition, due to the small bulk density of silicon powder, it is difficult to store, weigh and add, which greatly affects the construction progress of the concrete. Based on the problems caused by the performance of the silicon powder concrete material, it is necessary to explore new materials and new processes for the overflow surface. SUMMARY

[0004] In order to improve the problems of the silicon powder concrete mentioned above, such as difficult construction, poor workability, difficult to vibrate and compact the concrete, difficult to collect and smooth the surface, and many honeycomb and rough surfaces, and poor concrete surface flatness, the present application provides a steel lining overflow surface structure and a construction process thereof.

[0005] The present application provides a steel lining overflow surface structure, which adopts the following technical scheme:

[0006] The overflow face structure of steel lining comprises a weir body, a steel lining is arranged at the overflow face of the weir body, the upper part of the weir body is provided with a side wall, a pier, an inspection gate and a working gate, the piers are provided with a steel lining, the steel lining is connected with the weir body and the pier by connecting steel bars, the weir body is provided with a structural joint, the structural joint is provided with a copper water stop assembly, the weir body is sequentially provided with a roller compacted concrete area and a normal concrete area from inside to outside, the roller compacted concrete area is provided with a horizontal construction joint, the inner side of the steel lining is welded with a connecting steel bar, the steel lining and the normal concrete area are provided with contact grouting, the joint of the steel lining and the structural joint are provided with a joint filling material, and the copper water stop assembly is welded with the steel lining to form a water stop weld.

[0007] Through the above technical scheme, the steel lining is fixed outside the weir body through the connecting steel bars, the traditional overflow face material is replaced by the steel lining, the pouring of the overflow face secondary concrete and the drawing mold are not needed, the steel lining can be used as an overflow face formwork, and the construction is fast and convenient.

[0008] Optionally, in the overflow face structure of steel lining, the bottom of the inspection gate is provided with an inspection gate slot secondary concrete and an inspection gate slot embedded part.

[0009] Optionally, in the overflow face structure of steel lining, the bottom of the working gate is provided with a working gate slot secondary concrete and a working gate slot embedded part.

[0010] Optionally, in the overflow face structure of steel lining, the copper water stop assembly comprises a first copper water stop and a second copper water stop, the first copper water stop is welded with the inspection gate slot embedded part, the working gate slot embedded part and the steel lining, and the second copper water stop is embedded below the first copper water stop.

[0011] Through the above technical scheme, the first copper water stop, the inspection gate slot embedded part, the working gate slot embedded part and the steel lining are combined to prevent the high-speed water flow of the overflow face from leaking out.

[0012] Optionally, in the overflow face structure of steel lining, the steel lining is arranged at the overflow face of the weir body downstream of the working gate slot secondary concrete.

[0013] Through the above technical scheme, the steel lining is prefabricated in a factory, has higher manufacturing precision, is more consistent with the design overflow face body curve, and is installed in a segmented casting and welding assembly mode.

[0014] Optionally, in the overflow face structure of steel lining, the steel lining should match the design required height of the overflow face when being cast, and the steel lining is slightly higher than the horizontal construction joint.

[0015] Through the above technical scheme, the steel lining is slightly higher than the horizontal construction joint, so that the steel lining is used as a formwork for the roller compacted concrete.

[0016] Optionally, in the above-mentioned steel-lined overflow surface structure, the connecting steel bars have a length L = 50-100cm, a diameter d = 25-32mm, a spacing of 20cm-50cm, and are bent at both ends by 40d. One end of the connecting steel bar is bent and welded securely to the steel lining. The upper steel bars in the steel lining segment are connected to the roller-compacted concrete zone of the previous section.

[0017] The above technical solution facilitates the fixing of the steel lining to the roller-compacted concrete zone by connecting the reinforcing bars.

[0018] Optionally, in the above-mentioned steel-lined overflow surface structure, the area where the copper waterstop component and connecting steel bars are located should be adjusted to modified concrete with the same index as the roller-compacted concrete zone.

[0019] Through the above technical solution, modified concrete refers to concrete in which an appropriate amount of cement mortar (generally between 4% and 7% of the total modified concrete volume) is added to the roller-compacted concrete mixture to make it vibrable, and then it is compacted by immersion vibrator to form a type of concrete with the characteristics of conventional concrete.

[0020] Another technical solution proposed in this invention: a construction process for a steel-lined overflow surface structure, comprising the following steps:

[0021] S101: First, pour roller-compacted concrete and normal concrete zones outside the dam body, and install copper water-stop components in the structural joints of the dam body.

[0022] S102: The steel lining is pre-manufactured by using segmented casting and multiple steel linings are assembled together by welding;

[0023] S103: Subsequently, the steel reinforcement is bent at one end and welded firmly to the steel lining. The upper steel reinforcement in the steel lining section can be slightly longer and connected to the previous compacted concrete area, thereby assembling the steel lining on the weir body. For each section poured, a layer of steel lining is welded, and the stability of the steel lining installation is increased by using joint filling material and contact grouting.

[0024] S104: Finally, the wear-resistant and erosion-resistant overflow surface concrete is replaced with steel lining, thereby increasing the wear-resistant and erosion-resistant properties of the weir.

[0025] In summary, the present invention has at least one of the following beneficial effects: 1. By using steel lining to replace traditional overflow surface materials, there is no need to pour secondary concrete for the overflow surface and formwork. The steel lining can be used as overflow surface template, making construction quick and convenient.

[0026] 2. The steel lining has stronger wear and erosion resistance, longer service life, and simpler maintenance; the steel lining is prefabricated in the factory, with higher manufacturing precision and a better fit to the design overflow surface curve;

[0027] 3. By using steel lining, the overflow surface concrete grade is lower, and the pressure of temperature control and crack prevention is reduced. Attached Figure Description

[0028] Figure 1 This is a front view of the present invention;

[0029] Figure 2 This is the present invention. Figure 1 Enlarged view of the structure at point A in the middle;

[0030] Figure 3 This is the present invention. Figure 2 Enlarged view of the structure at point A-1;

[0031] Figure 4 This is the present invention. Figure 2 Enlarged view of the structure at point A-2 in the middle;

[0032] Figure 5 This is the present invention. Figure 1 Enlarged view of the structure at point B in the middle;

[0033] Figure 6 This is the present invention. Figure 5 Enlarged view of the structure at point B-1;

[0034] Figure 7 This is the present invention. Figure 1 The cross-sectional view shows the connection between the steel lining and the gate pier;

[0035] Figure 8 This is the present invention. Figure 7 Enlarged view of the structure at point C-1.

[0036] In the diagram: 1. Sidewall; 2. Gate pier; 3. Maintenance gate; 31. Second-stage concrete for maintenance gate slot; 311. Embedded parts for maintenance gate slot; 4. Working gate; 41. Second-stage concrete for working gate slot; 411. Embedded parts for working gate slot; 5. Weir body; 6. Steel lining; 7. Copper waterstop assembly; 71. First copper waterstop; 72. Second copper waterstop; 8. Normal concrete area; 9. Roller-compacted concrete area; 91. Horizontal construction joint; 10. Connecting reinforcement; 11. Structural joint; 12. Waterstop weld; 13. Joint filler; 14. Contact grouting. Detailed Implementation

[0037] The following is in conjunction with the appendix Figures 1-8 The present invention will be described in further detail below.

[0038] Please refer to the attached diagram in the instruction manual. Figures 1-8 An embodiment of the present invention provides a steel-lined overflow surface structure, including a weir body 5, a steel lining 6 provided at the overflow surface of the weir body 5, and a side wall 1, a gate pier 2, a maintenance gate 3 and a working gate 4 provided on the upper part of the weir body 5. The gate pier 2 is a middle pier or a side pier in the overflow dam.

[0039] The bottom of the inspection gate 3 is provided with an inspection gate trench secondary concrete 31 and an inspection gate trench embedded part 311 inserted with the steel lining 6; the bottom of the working gate 4 is provided with a working gate trench secondary concrete 41 and a working gate trench embedded part 411 inserted with the steel lining 6.

[0040] The steel lining 6 is arranged between the gate piers 2 and connected with the weir body 5 and the gate piers 2 by the connecting steel bars 10, the weir body 5 is provided with a structural joint 11, the copper water stop assembly 7 is arranged in the structural joint 11, the copper water stop assembly 7 includes a first copper water stop 71 and a second copper water stop 72, the first copper water stop 71 is welded with the inspection gate trench embedded part 311, the working gate trench embedded part 411 and the steel lining 6 respectively, the second copper water stop 72 is embedded below the first copper water stop 71, and the first copper water stop 71 cooperates with the inspection gate trench embedded part 311, the working gate trench embedded part 411 and the steel lining 6 to facilitate fixing the inspection gate 3 and the working gate 4 on the weir body 5.

[0041] The steel lining 6 is arranged at the overflow surface of the weir body 5 downstream of the working gate trench secondary concrete 41, the steel lining 6 is prefabricated in the factory, has higher manufacturing precision, is more matched with the design overflow surface body curve, and is installed in a segmented casting and welding assembly manner.

[0042] The weir body 5 is sequentially provided with a roller compacted concrete area 9 and a normal concrete area 8 from inside to outside, the roller compacted concrete area 9 is provided with a horizontal construction joint 91, the steel lining 6 should be matched with the design required weir height when casting, the steel lining 6 is slightly higher than the horizontal construction joint 91, and the steel lining 6 is slightly higher than the horizontal construction joint 91 to facilitate the operator to transport and install.

[0043] The inner side of the steel lining 6 is welded with the connecting steel bars 10, the connecting steel bars 10 have a length L=50-100cm, a diameter d=25-32mm, an interval of 20cm-50cm, and are bent by 40d at two ends, one end of the connecting steel bars 10 is bent and welded with the steel lining 6 firmly, the upper steel bars of the segmented steel lining 6 are connected with the roller compacted concrete area 9 of the previous bin, and the connecting steel bars 10 facilitate fixing the steel lining 6 and the roller compacted concrete area 9 together.

[0044] The area where the copper water stop assembly 7 and the connecting steel bars 10 are located should be adjusted to be the same as the abnormal concrete of the roller compacted concrete area 9, the abnormal concrete refers to adding a proper amount of cement mortar, generally 4%-7% of the total amount of the abnormal concrete, to the roller compacted concrete mixture to make it have a vibration property, and then vibrating and compacting by using an inserted vibrator to form a kind of concrete with the characteristics of conventional concrete, and the abnormal concrete is convenient and fast to construct.

[0045] The steel lining 6 is provided with the contact grouting 14 between the steel lining 6 and the normal concrete area 8, the steel lining 6 is provided with the joint filling material 13 at the joint and the structural joint 11, and the copper water stop assembly 7 is welded with the steel lining 6 to form the water stop weld 12.

[0046] In summary: the steel lining 6 is fixed outside the weir body 5 by the connecting steel bars 10, the traditional overflow surface material is replaced by the steel lining 6, the secondary concrete and the mold for pouring the overflow surface are not needed, the steel lining 6 can be used as the overflow surface template, and the construction is fast and convenient.

[0047] In order to better show a steel lining overflow surface structure, the embodiment presents a construction process of the steel lining overflow surface structure, which comprises the following steps:

[0048] Step one: first, the rolling concrete area 9 and the normal concrete area 8 are poured outside the weir body 5, and the copper water stop assembly 7 is arranged in the structural joint 11 of the weir body 5;

[0049] Step two: the steel lining 6 is pre-manufactured by adopting the segmented casting mode, and the plurality of steel linings 6 are assembled together by welding;

[0050] Step three: then, one end of the connecting steel bar 10 is bent and welded with the steel lining 6 firmly, the upper steel bar in the segmented steel lining 6 can be slightly longer and connected with the rolling concrete area 9 of the previous bin, so that the steel lining 6 is assembled on the weir body 5, one layer of the steel lining 6 is welded for each pouring bin, and the stability of the steel lining 6 installation is increased by the joint filling material 13 and the contact grouting 14;

[0051] Step four: finally, the anti-wear and anti-erosion overflow surface concrete is replaced by the steel lining 6, so as to increase the anti-wear and anti-erosion properties of the weir body 5.

[0052] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A steel-lined overflow surface structure, comprising a weir body (5), characterized in that: The overflow surface of the weir (5) is provided with a steel lining (6). The upper part of the weir (5) is provided with a side wall (1), gate piers (2), maintenance gate (3) and working gate (4). The steel lining (6) is provided between the gate piers (2). The steel lining (6) is connected to the weir (5) and gate piers (2) by connecting steel bars (10). The weir (5) has a structural joint (11). A copper water-stop component (7) is provided in the structural joint (11). The weir (5) extends from the inside to the outside. The outer side is provided with a roller-compacted concrete zone (9) and a normal concrete zone (8). A horizontal construction joint (91) is provided in the roller-compacted concrete zone (9). A connecting steel bar (10) is welded to the inner side of the steel lining (6). A contact grouting (14) is provided between the steel lining (6) and the normal concrete zone (8). A sealant (13) is provided at the splice of the steel lining (6) and in the structural joint (11). The copper water-stop component (7) is welded to the steel lining (6) to form a water-stop weld (12).

2. The steel-lined overflow surface structure according to claim 1, characterized in that: The bottom of the maintenance gate (3) is provided with maintenance gate slot secondary concrete (31) and maintenance gate slot embedded part (311), and the bottom of the working gate (4) is provided with working gate slot secondary concrete (41) and working gate slot embedded part (411) that are inserted into the steel lining (6).

3. The steel-lined overflow surface structure according to claim 2, characterized in that: The copper waterstop assembly (7) includes a first copper waterstop (71) and a second copper waterstop (72). The first copper waterstop (71) is welded to the maintenance door groove embedded part (311), the working door groove embedded part (411), and the steel lining (6) respectively. The second copper waterstop (72) is embedded below the first copper waterstop (71).

4. The steel-lined overflow surface structure according to claim 2, characterized in that: The steel lining (6) is arranged at the overflow surface of the weir body (5) downstream of the second-stage concrete (41) of the working gate slot.

5. The steel-lined overflow surface structure according to claim 1, characterized in that: The steel lining (6) should be cast to match the height of the storage surface required by the design, and the steel lining (6) should be slightly higher than the horizontal construction joint (91).

6. The steel-lined overflow surface structure according to claim 1, characterized in that: The connecting steel bar (10) has a length L = 50-100cm, a diameter d = 25-32mm, a row spacing of 20cm-50cm, and is bent at both ends by 40d. One end of the connecting steel bar (10) is bent and welded firmly to the steel lining (6). The upper steel bar in the segment of the steel lining (6) is connected to the roller-compacted concrete zone (9) of the previous section.

7. The steel-lined overflow surface structure according to claim 1, characterized in that: The area where the copper waterstop component (7) and the connecting steel bar (10) are located should be adjusted to be modified concrete with the same index as the roller-compacted concrete area (9).

8. A construction process for a steel-lined overflow surface structure as described in any one of claims 1-7, comprising the following steps: S101: First, a roller-compacted concrete zone (9) and a normal concrete zone (8) are poured outside the dam body (5), and a copper waterstop component (7) is installed in the structural joint (11) of the dam body (5). S102: The steel liner (6) is pre-manufactured by means of segmented casting and multiple steel liners (6) are assembled together by welding. S103: Subsequently, the steel lining (6) is welded securely to the steel lining (6) by bending one end of the connecting steel bar (10). The upper steel bar in the segment of the steel lining (6) can be slightly longer and connected to the previous compacted concrete area (9), thereby assembling the steel lining (6) on the weir body (5). For each section poured, a layer of steel lining (6) is welded, and the stability of the steel lining (6) installation is increased by using the joint filling material (13) and contact grouting (14). S104: Finally, the wear-resistant and erosion-resistant overflow surface concrete is replaced with steel lining (6) to increase the wear-resistant and erosion-resistant properties of the weir body (5).

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