Steel lining overflow surface structure and construction process thereof

Abstract

The invention discloses a steel lining overflow surface structure and a construction technology thereof, and relates to the technical field of overflow dam construction, the steel lining overflow surface structure comprises a weir body, a steel lining is arranged on the overflow surface of the weir body, a side wall, gate piers, a bulkhead gate and a service gate are arranged on the upper portion of the weir body, and the steel lining is arranged between the gate piers. The steel lining is connected with the cofferdam body and the gate pier through connecting steel bars, the cofferdam body is provided with a structural joint, a copper water stop assembly is arranged in the structural joint, the cofferdam 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 for replacing a traditional overflow surface material, pouring of overflow surface second-stage concrete and die drawing are not needed, the steel lining can serve as an overflow surface template, and construction is rapid and convenient; the steel lining is higher in wear resistance and erosion resistance, longer in service life and simple in later maintenance; the steel lining is prefabricated in a factory, the manufacturing precision is higher, and the steel lining better fits the shape curve of the designed overflow face.

Description

Technical Field

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

[0002] Overflow dam is a common dam structure in hydropower projects. It uses its own overflow surface to discharge water, and the high-speed water flow scouring problem is significant. Traditional overflow surfaces generally use high-strength reinforced concrete, which uses a lot of steel bars. The control of the overflow surface sliding template is difficult, the construction process and technology are complicated, and it is greatly affected by materials and construction control. The strength and erosion resistance are difficult to guarantee, and there are strong constraints.

[0003] At present, C is often used in practical engineering. 28 40 Silica fume concrete replaces reinforced concrete as overflow surface, but there are still several problems: (1) Silica fume concrete is difficult to construct and has poor workability. It is not easy to vibrate and compact the concrete, and it is not easy to finish the surface. There are many honeycomb surfaces and the surface flatness of the concrete is poor. (2) Silica fume concrete is prone to shrinkage cracks, which affects the overall strength and use effect; (3) The early strength of silica fume concrete develops very quickly, and the corresponding hydration heat release rate of the concrete is very fast, which causes the hydration heat temperature of the concrete to rise, and it is easy to produce large temperature stress in the concrete. This stress produces stress concentration at the top of the shrinkage crack, causing the shrinkage crack to expand and extend, and even form through cracks. Especially in the high-altitude and cold areas of Tibet, the temperature difference is large, and the overflow surface temperature cracks are more common, which is difficult and frequent to repair in the later stage. (4) Silica fume particles are fine and light, which is easy to generate dust and waste during construction; and because of the small bulk density of silica fume, the volume of concrete mixed is large, and it is difficult to store, weigh, and mix, which greatly affects the construction progress of concrete. Based on the above problems caused by the performance of silica fume concrete materials, it is necessary to explore new materials and new processes for overflow surfaces. Summary of the invention

[0004] In order to improve the above-mentioned problems of silica fume concrete, such as great difficulty in construction, poor construction workability, difficulty in vibrating and compacting the concrete, difficulty in finishing and plastering, many honeycombed surfaces, and poor concrete surface flatness, the present invention provides a steel lining overflow surface structure and its construction process.

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

[0006] A steel-lined overflow surface structure comprises a weir body, wherein a steel lining is arranged at the overflow surface of the weir body, a side wall, a gate pier, a maintenance gate and a working gate are arranged on the upper part of the weir body, a steel lining is arranged between the gate piers, the steel lining is connected to the weir body and the gate pier by connecting steel bars, a structural seam is provided on the weir body, a copper water-stop assembly is arranged in the structural seam, a roller compacted concrete area and a normal concrete area are arranged in sequence on the weir body from the inside to the outside, a horizontal construction joint is arranged in the roller compacted concrete area, connecting steel bars are welded to the inner side of the steel lining, contact grouting is arranged between the steel lining and the normal concrete area, caulking materials are arranged at the joints of the steel lining and in the structural seams, and the copper water-stop assembly is welded to the steel lining to form a water-stop weld.

[0007] Through the above technical scheme, the steel lining can be conveniently fixed to the outside of the weir body by connecting the steel bars. By using the steel lining to replace the traditional overflow surface material, there is no need to pour the overflow surface second phase concrete and draw the formwork. The steel lining can be used as the overflow surface template, and the construction is fast and convenient.

[0008] Optionally, in the above-mentioned steel-lined overflow surface structure, the bottom of the inspection gate is provided with a second-phase inspection gate slot concrete and an inspection gate slot embedded parts.

[0009] Optionally, in the above-mentioned steel-lined overflow surface structure, the bottom of the working gate is provided with working gate slot second-phase concrete and working gate slot embedded parts.

[0010] Optionally, in the above-mentioned steel lined overflow surface structure, the copper waterstop assembly includes a first copper waterstop and a second copper waterstop, the first copper waterstop is welded to the maintenance door groove embedded parts, the working door groove embedded parts, and the steel lining respectively, and the second copper waterstop is buried 50 cm below the first concrete.

[0011] Through the above technical scheme, the first copper water stop cooperates with the maintenance door groove embedded parts, the working door groove embedded parts and the steel lining to prevent high-speed water leakage from the overflow surface.

[0012] Optionally, in the above-mentioned steel lining overflow surface structure, the steel lining is arranged at the overflow surface of the weir body downstream of the second phase concrete of the working gate slot.

[0013] Through the above technical solution, the steel lining is prefabricated in the factory with higher manufacturing precision, more closely fitting the designed overflow surface curve, and is installed by segmented casting and welding assembly.

[0014] Optionally, in the above-mentioned steel lining overflow surface structure, the steel lining should be matched with the warehouse surface height required by the design during casting, and the steel lining should be slightly higher than the horizontal construction joint.

[0015] Through the above technical solution, the steel lining is slightly higher than the horizontal construction joint, which facilitates the use of the steel lining as a template for rolled concrete.

[0016] Optionally, in the above-mentioned steel lining overflow surface structure, the length of the connecting steel bar is L = 50-100cm, the diameter is d = 25-32mm, the spacing between rows is 20cm-50cm, and the two ends are bent by 40d. One end of the connecting steel bar is bent and firmly welded to the steel lining, and the upper steel bars in the steel lining segment are connected to the rolled concrete area of ​​the upper bin.

[0017] Through the above technical solution, the steel lining and the roller compacted concrete area can be conveniently fixed together by connecting the steel bars.

[0018] Optionally, in the above-mentioned steel-lined overflow surface structure, the area where the copper water-stop assembly and the connecting steel bars are located should be adjusted to deformed concrete with the same indicators as the rolled concrete area.

[0019] Through the above technical scheme, the modified concrete refers to adding an appropriate amount of cement mortar (generally between 4% and 7% of the total amount of modified concrete) to the rolled concrete mixture to make it vibrable, and then vibrating and compacting it with an inserted vibrator to form a concrete with the characteristics of conventional concrete.

[0020] Another technical solution proposed by the present invention is a construction process of a steel lining overflow surface structure, comprising the following steps:

[0021] S101: First, a roller compacted concrete area and a normal concrete area are poured outside the weir body, and a copper water stop component is installed in the structural joint of the weir body;

[0022] S102: prefabricate the steel lining by using segmented casting, and assemble multiple steel linings together by welding;

[0023] S103: Then, one end of the connecting steel bar is bent and welded to the steel lining securely. The steel bar in the upper part of the steel lining segment can be slightly longer and connected to the RCC area of ​​the upper bin, so that the steel lining is assembled on the weir body. After each bin is poured, a layer of steel lining is welded, and the stability of the steel lining installation is increased by using caulking materials and contact grouting;

[0024] S104: Finally, the wear and erosion resistant overflow surface concrete is replaced by a steel lining to increase the wear and erosion resistance of the weir body.

[0025] In summary, the present invention includes at least one of the following beneficial effects:

[0026] 1. By using steel lining to replace traditional overflow surface materials, there is no need to pour the second phase concrete and draw the formwork of the overflow surface. The steel lining can be used as the overflow surface template, and the construction is fast and convenient;

[0027] 2. The steel lining has stronger wear resistance and erosion resistance, longer service life and simple later maintenance; the steel lining is prefabricated in the factory, with higher manufacturing precision and more in line with the designed overflow surface curve;

[0028] 3. By using steel lining, the overflow surface concrete grade is lower, and the temperature control and crack prevention pressure can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a front view of the present invention;

[0030] Figure 2 The present invention Figure 1 A magnified view of the structure at center;

[0031] Figure 3 The present invention Figure 2 A-1 in the middle is an enlarged view of the structure;

[0032] Figure 4 The present invention Figure 2 A-2 in the middle is an enlarged view of the structure;

[0033] Figure 5 The present invention Figure 1 A magnified view of the structure at B in the middle;

[0034] Figure 6 The present invention Figure 5 A magnified view of the structure at B-1 in the middle;

[0035] Figure 7 The present invention Figure 1 The cross-section diagram shows the connection between the steel lining and the gate pier;

[0036] Figure 8 The present invention Figure 7 Enlarged view of the structure at C-1 in the middle.

[0037] In the figure: 1. Side wall; 2. Gate pier; 3. Inspection gate; 31. Inspection gate slot second phase concrete; 311. Inspection gate slot embedded parts; 4. Working gate; 41. Working gate slot second phase concrete; 411. Working gate slot embedded parts; 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 steel bars; 11. Structural joint; 12. Waterstop weld; 13. Sealing material; 14. Contact grouting. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-8 The present invention is described in further detail.

[0039] Please refer to the attached figure in the instruction manual Figure 1-8 An embodiment of the present invention is as follows: a steel-lined overflow surface structure comprises a weir body 5, a steel lining 6 is arranged at the overflow surface of the weir body 5, a side wall 1, a gate pier 2, a maintenance gate 3 and a working gate 4 are arranged on the upper part of the weir body 5, and the gate pier 2 is a middle pier or a side pier in the overflow dam.

[0040] The bottom of the inspection gate 3 is provided with the inspection gate slot second phase concrete 31 and the inspection gate slot embedded parts 311 plugged with the steel lining 6; the bottom of the working gate 4 is provided with the working gate slot second phase concrete 41 and the working gate slot embedded parts 411 plugged with the steel lining 6.

[0041] A steel lining 6 is arranged between the gate piers 2, and the steel lining 6 is connected to the weir body 5 and the gate pier 2 by connecting steel bars 10. A structural seam 11 is opened in the weir body 5, and a copper water-stop assembly 7 is arranged in the structural seam 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 to the maintenance door groove embedded parts 311, the working door groove embedded parts 411, and the steel lining 6 respectively, and the second copper water-stop 72 is buried 50 cm below the first concrete. The first copper water-stop 71 cooperates with the maintenance door groove embedded parts 311, the working door groove embedded parts 411, and the steel lining 6 to facilitate fixing the maintenance gate 3 and the working gate 4 on the weir body 5.

[0042] The steel lining 6 is arranged at the overflow surface of the weir body 5 downstream of the working gate slot second phase concrete 41. The steel lining 6 is prefabricated in the factory, has higher manufacturing precision, fits better with the designed overflow surface body curve, and is installed by segmented casting and welding assembly.

[0043] The weir body 5 is provided with a roller compacted concrete area 9 and a normal concrete area 8 in sequence from the inside to the outside. A horizontal construction joint 91 is provided in the roller compacted concrete area 9. When the steel lining 6 is cast, it should match the warehouse surface height required by the design. The steel lining 6 is slightly higher than the horizontal construction joint 91. By making the steel lining 6 slightly higher than the horizontal construction joint 91, it is convenient for the operator to transport and install it.

[0044] A connecting steel bar 10 is welded on the inner side of the steel lining 6. The length of the connecting steel bar 10 is L = 50-100cm, the diameter is d = 25-32mm, the spacing between rows is 20cm-50cm, and the two ends are bent 40d. One end of the connecting steel bar 10 is bent and welded firmly to the steel lining 6. The upper steel bars in the middle of the steel lining 6 are connected to the upper roller compacted concrete area 9. The connecting steel bar 10 facilitates fixing the steel lining 6 and the roller compacted concrete area 9 together.

[0045] The area where the copper water-stop assembly 7 and the connecting steel bars 10 are located should be adjusted to the modified concrete with the same indicators as the rolled concrete area 9. Modified concrete refers to adding an appropriate amount of cement mortar to the rolled concrete mixture, generally between 4% and 7% of the total amount of modified concrete to make it vibratory, and then vibrating and compacting it with an inserted vibrator to form a concrete with the characteristics of conventional concrete. The construction of modified concrete is convenient and quick.

[0046] Contact grouting 14 is provided between the steel lining 6 and the normal concrete area 8, and joint filling materials 13, such as asphalt pine boards, are provided at the joints of the steel lining 6 and in the structural joints 11. The copper water stop assembly 7 is welded to the steel lining 6 to form a water stop weld 12.

[0047] In summary: by connecting the steel bars 10, it is convenient to fix the steel lining 6 on the outside of the weir body 5. By using the steel lining 6 to replace the traditional overflow surface material, there is no need to pour the overflow surface second-phase concrete and draw the formwork. The steel lining 6 can be used as an overflow surface template, and the construction is fast and convenient.

[0048] In order to better demonstrate a steel lining overflow surface structure, this embodiment now proposes a construction process of a steel lining overflow surface structure, including the following steps:

[0049] Step 1: pouring a roller compacted concrete area 9 and a normal concrete area 8 outside the weir body 5, and installing a copper water stop component 7 in the structural joint 11 of the weir body 5;

[0050] Step 2: prefabricate the steel liner 6 by segmented casting, and assemble multiple steel liners 6 together by welding;

[0051] Step 3: Then, one end of the connecting steel bar 10 is bent and welded to the steel lining 6 securely. The steel bars in the upper part of the steel lining 6 segment can be slightly longer and connected to the roller compacted concrete area 9 of the upper bin, so that the steel lining 6 is assembled on the weir body 5. After each bin is poured, a layer of steel lining 6 is welded, and the stability of the installation of the steel lining 6 is increased by using the caulking material 13 and the contact grouting 14;

[0052] Step 4: Finally, the wear-resistant and erosion-resistant overflow surface concrete is replaced by the steel lining 6 , thereby increasing the wear-resistant and erosion-resistant properties of the weir body 5 .

[0053] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel-lined overflow surface structure, comprising a weir body (5), characterized in that: The overflow surface of the weir body (5) is provided with a steel lining (6); the upper part of the weir body (5) is provided with a side wall (1), a gate pier (2), a maintenance gate (3) and a working gate (4); a steel lining (6) is provided between the gate piers (2); the steel lining (6) is connected to the weir body (5) and the gate pier (2) by means of connecting steel bars (10); the weir body (5) is provided with a structural seam (11); a copper water stop assembly (7) is provided in the structural seam (11); the weir body (5) is provided with a steel lining (6) from the inside to the outside; A rolled concrete area (9) and a normal concrete area (8) are sequentially arranged outside, a horizontal construction joint (91) is opened in the rolled concrete area (9), a connecting steel bar (10) is welded on the inner side of the steel lining (6), a contact grouting (14) is arranged between the steel lining (6) and the normal concrete area (8), a caulking material (13) is arranged at the joint of the steel lining (6) and the structural joint (11), and the copper water-stop assembly (7) is welded to the steel lining (6) to form a water-stop weld (12).

2. The steel lining overflow surface structure according to claim 1 is characterized in that: The bottom of the inspection gate (3) is provided with an inspection gate slot second-stage concrete (31) and an inspection gate slot embedded part (311), and the bottom of the working gate (4) is provided with a working gate slot second-stage concrete (41) plugged into the steel lining (6) and a working gate slot embedded part (411).

3. The steel lining overflow surface structure according to claim 2 is characterized in that: The copper water stop assembly (7) comprises a first copper water stop (71) and a second copper water stop (72); the first copper water stop (71) is welded to the inspection door slot embedded part (311), the working door slot embedded part (411), and the steel lining (6) respectively; and the second copper water stop (72) is buried 50 cm below the first concrete.

4. The steel lining 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 groove.

5. The steel lining overflow surface structure according to claim 1, characterized in that: The steel lining (6) should be matched with the warehouse surface height required by the design during casting, and the steel lining (6) is slightly higher than the horizontal construction joint (91).

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

7. The steel lining overflow surface structure according to claim 1, characterized in that: The area where the copper water stop assembly (7) and the connecting steel bars (10) are located should be adjusted to a deformed concrete with the same index as the roller compacted concrete area (9).

8. A construction process for the steel lining overflow surface structure according to any one of claims 1 to 7, comprising the following steps: S101: first, pouring a roller compacted concrete area (9) and a normal concrete area (8) outside the weir body (5), and installing a copper water stop component (7) in a structural joint (11) of the weir body (5); S102: prefabricate a steel liner (6) by adopting a segmented casting method, and assemble a plurality of steel liners (6) together by welding; S103: Then, one end of the connecting steel bar (10) is bent and welded to the steel lining (6) securely. The steel bars in the upper part of the steel lining (6) can be slightly longer and connected to the roller compacted concrete area (9) of the upper bin, so that the steel lining (6) is assembled on the weir body (5). After each bin is poured, a layer of steel lining (6) is welded, and the stability of the installation of the steel lining (6) is increased by using caulking material (13) and contact grouting (14); S104: Finally, the wear-resistant and erosion-resistant overflow surface concrete is replaced by a steel lining (6), thereby increasing the wear-resistant and erosion-resistant properties of the weir body (5).

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