Anti-seepage repairing method for roller compacted concrete dam hole stacking construction

Abstract

The invention discloses an anti-seepage repairing method for hole stacking construction of a roller compacted concrete dam, and belongs to the technical field of anti-seepage construction and seepage repairing of concrete dams. The method comprises the following steps that firstly, construction of a lowermost concrete filling layer of the roller compacted concrete dam is completed; step 2, constructing a stacked hole anti-seepage structure at the boundary of the roller compacted concrete and the distorted concrete of the lowest concrete filling layer; and thirdly, according to the first step and the second step, construction of the remaining concrete filling layers of the roller-compacted concrete dam is sequentially completed from bottom to top, and after construction of all the concrete filling layers is completed, a stacked hole anti-seepage structure is correspondingly constructed at the boundary of the roller-compacted concrete and the distorted concrete of the concrete filling layer. The hole stacking anti-seepage structure is constructed at the joint, namely the boundary, of the roller compacted concrete and the distorted concrete of the concrete filling layer, so that construction gaps are repaired, the anti-seepage performance of the joint of the roller compacted concrete and the distorted concrete is improved, and leakage of the roller compacted concrete dam is avoided.

Description

Technical Field

[0001] The invention relates to an anti-seepage repair method for a roller compacted concrete dam constructed with overlapping holes, belonging to the technical field of anti-seepage construction and leakage repair of concrete dams. Background Art

[0002] In recent years, with the development of the hydropower energy industry, roller compacted concrete dams have become an important dam type in water conservancy project construction. However, during its construction, construction gaps are prone to appear at the junction of roller compacted concrete and deformed concrete. If the construction gaps are serious, it may cause leakage in the dam. Therefore, how to improve the anti-seepage performance of the junction of roller compacted concrete and deformed concrete is a livelihood issue related to the quality and safety of the dam.

[0003] The Chinese patent document with the publication number CN103132489A discloses a construction method and an anti-seepage dam of a 200m-level high roller compacted concrete dam, which provides a solution for the setting of the anti-seepage system of a 200m-level high roller compacted concrete dam, embodies the anti-seepage design concept of water head segmentation and "front blocking and rear drainage, layer-by-layer defense", and uses the deformed concrete and secondary roller compacted concrete to form the first line of defense for the dam body's anti-seepage. The surface layer steel mesh is laid to improve the toughness of the deformed concrete itself, which plays a role in preventing surface cracks. The cement-based anti-seepage crystalline anti-seepage material is used to repair the microcracks that may occur on the surface of the dam body to further strengthen the anti-seepage of the dam body. On the basis of layer-by-layer defense of the anti-seepage body, a grid-shaped drainage network is set up in the dam to drain the water that passes through the anti-seepage layer, which effectively reduces the seepage pressure in the dam and again blocks the leakage channel of the water that passes through the anti-seepage layer to the downstream dam surface. The technical problem that the layered casting method makes the layers between the dam body become the weakest link is solved, and the interlayer strength and interlayer anti-seepage ability are improved.

[0004] However, this method and the anti-seepage dam are mainly used to improve the interlayer strength and interlayer anti-seepage capacity of the dam body, and are aimed at the horizontal construction joints of the dam, and cannot be used to improve the anti-seepage capacity of the vertical construction joints at the junction of rolled concrete and deformed concrete. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for anti-seepage repair of a roller compacted concrete dam by stacking holes.

[0006] The present invention is achieved through the following technical solutions:

[0007] A method for anti-seepage repair of a roller compacted concrete dam by stacking holes, comprising the following steps:

[0008] Step 1: Complete the construction of the lowest concrete filling layer of the RCC dam;

[0009] Step 2: construct a stacked hole anti-seepage structure at the boundary between the rolled concrete and the deformed concrete of the lowest concrete filling layer;

[0010] Step 3. Referring to Step 1 and Step 2, complete the construction of the remaining concrete filling layers of the RCC dam from bottom to top, and after completing the construction of each concrete filling layer, construct a stacked hole anti-seepage structure at the boundary between the RCC and the deformed concrete of that concrete filling layer.

[0011] During the construction of the concrete filling layer in step 1 and step 3, the roller compacted concrete is first poured to form the roller compacted concrete E zone, and then the modified concrete is poured to form the modified concrete F zone, and then the modified concrete F zone is fully vibrated.

[0012] The stacked hole anti-seepage structure includes a row of sequence I holes and a row of sequence II holes arranged at the boundary between the roller compacted concrete and the deformed concrete, the sequence I holes and the sequence II holes are circular holes arranged in the vertical direction, and each sequence II hole connects two adjacent sequence I holes;

[0013] Filler A is arranged in the pores of sequence I, and filler B is arranged in the pores of sequence II.

[0014] The center of the I-sequence hole is located on the boundary line between the RCC and the deformed concrete, and two adjacent I-sequence holes are tangent to each other;

[0015] The center of the II-order hole coincides with the tangent point of two adjacent I-order holes, and the diameter of the II-order hole is not greater than half of the diameter of the I-order hole.

[0016] The sizes of the I-order pores and the II-order pores satisfy formula (1):

[0017]

[0018] Simplifying formula (1), we get formula (2) as follows:

[0019]

[0020] Where H1 is the maximum distance from the point on the circle of the deformed concrete F zone on the I-sequence hole to the dividing line, H2 is the maximum distance from the point on the circle of the RCC E zone on the I-sequence hole to the dividing line, D is the diameter of the I-sequence hole, L is min is the minimum design width of the deformed concrete F zone, L max is the maximum design width of the deformed concrete F zone, d is the diameter of the II sequence hole, r is the radius of the II sequence hole, H3 is the distance from the bottom of the II sequence hole to the bottom of the I sequence hole, H4 is the depth of the II sequence hole, and H is the layer height of the concrete filling layer.

[0021] The filler A is modified concrete, and the modified concrete is poured into the I-sequence hole to form a modified concrete K zone.

[0022] The filler B is cement mortar, and cement mortar is poured into the II sequence holes to form a cement mortar Q zone.

[0023] The construction method of the stacked hole anti-seepage structure comprises the following steps:

[0024] Step A, mark the boundary line between the roller compacted concrete zone E and the modified concrete zone F at the construction joint;

[0025] Step B, drilling the sequence I hole at the boundary line, then pouring the modified concrete into the sequence I hole, and fully vibrating to form the modified concrete K zone;

[0026] Step C, drilling the II sequence holes at the boundary line, then pouring cement mortar into the II sequence holes, and fully vibrating to form a cement mortar Q zone;

[0027] Step D: Maintaining the surface of the RCC dam can complete the leakage repair work at the junction of the RCC area E and the deformed concrete area F.

[0028] The construction of the stacked-hole anti-seepage structure is completed before the initial setting of the roller compacted concrete zone E and the deformed concrete zone F.

[0029] The beneficial effects of the present invention are:

[0030] 1. By constructing a stacked hole anti-seepage structure at the junction of the rolled concrete and the deformed concrete in the concrete filling layer, that is, at the dividing line, the construction gap can be repaired to improve the anti-seepage performance of the junction of the rolled concrete and the deformed concrete, and avoid leakage in the rolled concrete dam.

[0031] 2. In the joint area where the roller compacted concrete zone E and the abnormal concrete zone F have been constructed, sequence I holes and sequence II holes are arranged, wherein sequence I holes span the roller compacted concrete zone E and the abnormal concrete zone F, and abnormal concrete is poured in sequence I holes, and the abnormal concrete is fully vibrated to form a abnormal concrete zone K, so that the roller compacted concrete zone E and the abnormal concrete zone F are fully integrated at the joint through the abnormal concrete zone K, so that the larger gaps or channels at the joint are well filled, and the joint is anti-seepage repaired; and the center of sequence II holes coincides with the tangent point of two adjacent sequence I holes, cement mortar is filled in sequence II holes, and cement mortar is fully vibrated to form a cement mortar Q zone, so that the smaller gaps or pores left after the construction of sequence I holes and abnormal concrete zone K are fully filled through the cement mortar Q zone, and the anti-seepage performance of the joint is further repaired and improved.

[0032] 3. The stacked hole anti-seepage structure is relatively simple to construct and easy to construct. The I-sequence hole and the II-sequence hole are used together. The I-sequence hole and the deformed concrete K zone provide anti-seepage protection for the junction of the rolled concrete zone E and the deformed concrete zone F. The II-sequence hole and the cement mortar Q zone further enhance the anti-seepage function of the I-sequence hole, achieving a double anti-seepage effect, which plays a great role in the safety and quality of dam operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a three-dimensional schematic diagram of a stacked hole anti-seepage structure arranged on a concrete filling layer according to the present invention;

[0034] Figure 2 A top view of the stacked hole anti-seepage structure provided on the concrete filling layer of the present invention;

[0035] Figure 3 for Figure 2 Section view along AA;

[0036] Figure 4 for Figure 2 Sectional view along BB;

[0037] Figure 5 It is a construction step diagram of the present invention.

[0038] In the figure: 1-Ⅰ sequence hole, 2-Ⅱ sequence hole, 3-deformed concrete F zone, 4-roller compacted concrete E zone, 5-deformed concrete K zone, 6-cement mortar Q zone, 7-dividing line. DETAILED DESCRIPTION

[0039] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0040] like Figures 1 to 5 As shown, the present invention provides a method for anti-seepage repair of a roller compacted concrete dam by stacking holes, comprising the following steps:

[0041] Step 1: Complete the construction of the lowest concrete filling layer of the RCC dam;

[0042] Step 2: construct a stacked hole anti-seepage structure at 7 points of the boundary between the rolled concrete and the deformed concrete of the bottom concrete filling layer;

[0043] Step 3, referring to Step 1 and Step 2, complete the construction of the remaining concrete filling layers of the RCC dam from bottom to top, and after completing the construction of each concrete filling layer, construct a stacked hole anti-seepage structure at the boundary line 7 between the RCC and the deformed concrete of the concrete filling layer. When in use, the stacked hole anti-seepage structure is constructed at the junction of the RCC and the deformed concrete in the concrete filling layer, that is, at the boundary line 7, to repair the construction gap, improve the anti-seepage performance of the junction of the RCC and the deformed concrete, and avoid leakage of the RCC dam.

[0044] During the construction of the concrete filling layer in step 1 and step 3, the roller compacted concrete is first poured to form the roller compacted concrete E zone 4, and then the modified concrete is poured to form the modified concrete F zone 3, and then the modified concrete F zone 3 is fully vibrated.

[0045] The stacked hole anti-seepage structure comprises a row of I-sequence holes 1 and a row of II-sequence holes 2 arranged at the boundary 7 between the rolled concrete and the deformed concrete, wherein the I-sequence holes 1 and the II-sequence holes 2 are circular holes arranged in the vertical direction, and each II-sequence hole 2 connects two adjacent I-sequence holes 1;

[0046] Filler A is arranged in the I-sequence hole 1, and filler B is arranged in the II-sequence hole 2. The overlapping hole anti-seepage structure is used to carry out anti-seepage repair on the joint of the roller compacted concrete and the deformed concrete, and the joint can be partially or completely anti-seepage repaired.

[0047] The center of the I-sequence hole 1 is located on the boundary 7 between the RCC and the deformed concrete, and two adjacent I-sequence holes 1 are tangent to each other;

[0048] The center of the II sequence hole 2 coincides with the tangent point of two adjacent I sequence holes 1, and the diameter of the II sequence hole 2 is not greater than half of the diameter of the I sequence hole 1. When in use, the depth of the II sequence hole 2 is half of the depth of the I sequence hole 1.

[0049] The sizes of the I-order pore 1 and the II-order pore 2 satisfy formula (1):

[0050]

[0051] Simplifying formula (1), we get formula (2) as follows:

[0052]

[0053] Where H1 is the maximum distance from the point on the circle of the deformed concrete F zone 3 on the I sequence hole 1 to the dividing line 7, H2 is the maximum distance from the point on the circle of the RCC E zone 4 on the I sequence hole 1 to the dividing line 7, D is the diameter of the I sequence hole 1, L is min is the minimum design width of the deformed concrete F zone 3, L maxis the maximum design width of the deformed concrete F zone 3, d is the diameter of the II sequence hole 2, r is the radius of the II sequence hole 2, H3 is the distance from the bottom of the II sequence hole 2 to the bottom of the I sequence hole 1, H4 is the depth of the II sequence hole 2, and H is the layer height of the concrete filling layer. When in use, the hole depth of the I sequence hole 1 is the same as the layer height of the deformed concrete F zone 3, and the hole depth of the I sequence hole 1 can also be determined according to actual conditions.

[0054] The filler A is modified concrete, and the modified concrete is poured into the I-sequence hole 1 to form a modified concrete K zone 5.

[0055] The filler B is cement mortar, and the cement mortar is poured into the II sequence hole 2 to form a cement mortar Q zone 6.

[0056] The construction method of the stacked hole anti-seepage structure comprises the following steps:

[0057] Step A, marking the boundary line 7 between the roller compacted concrete area E 4 and the modified concrete area F 3 at the construction joint;

[0058] Step B, drilling a sequence hole 1 at the dividing line 7, then pouring modified concrete into the sequence hole 1, and fully vibrating to form a modified concrete K zone 5;

[0059] Step C, drilling a hole II at the boundary line 7, then pouring cement mortar into the hole II, and fully vibrating to form a cement mortar Q zone 6;

[0060] Step D: Performing surface maintenance on the RCC dam can complete the leakage repair work at the junction of the RCC E area 4 and the deformed concrete F area 3.

[0061] In the joint area where the roller compacted concrete zone E 4 and the deformed concrete zone F 3 have been constructed, sequence holes 1 and sequence holes 2 are arranged, wherein sequence hole 1 spans the roller compacted concrete zone E 4 and the deformed concrete zone F 3, and the deformed concrete is poured in the sequence hole 1, and the deformed concrete is fully vibrated to form a deformed concrete zone K 5, so that the roller compacted concrete zone E 4 and the deformed concrete zone F 3 are fully integrated at the joint through the deformed concrete zone K 5, so that the larger gap or pore at the joint is well filled, and the joint is anti-seepage repaired; and the center of sequence hole 2 coincides with the tangent point of two adjacent sequence holes 1, cement mortar is filled in sequence hole 2, and cement mortar is fully vibrated to form a cement mortar Q zone 6, so that the smaller gaps or pores left after the construction of sequence hole 1 and deformed concrete zone K 5 are fully filled through the cement mortar Q zone 6, and the anti-seepage performance of the joint is further repaired and improved.

[0062] It can be seen that the combined use of sequence hole Ⅰ and sequence hole Ⅱ 2 provides anti-seepage protection for the junction of roller compacted concrete zone E 4 and deformed concrete zone F 3 through sequence hole Ⅰ 1 and deformed concrete zone K 5, and further enhances the anti-seepage function of sequence hole Ⅰ through sequence hole Ⅱ 2 and cement mortar zone Q 6, thereby achieving a double anti-seepage effect.

[0063] The construction of the stacked-hole anti-seepage structure is completed before the initial setting of the roller compacted concrete zone E 4 and the modified concrete zone F 3.

Claims

1. A method for anti-seepage repair of a roller compacted concrete dam by stacking holes, characterized in that: The following steps are involved: Step 1: Complete the construction of the lowest concrete filling layer of the RCC dam; Step 2: constructing a stacked hole anti-seepage structure at the boundary line (7) between the rolled concrete and the deformed concrete in the bottom concrete filling layer; Step 3, referring to Step 1 and Step 2, complete the construction of the remaining concrete filling layers of the RCC dam from bottom to top, and after completing the construction of each concrete filling layer, construct a stacked hole anti-seepage structure at the boundary line (7) between the RCC and the deformed concrete of the concrete filling layer.

2. The method for anti-seepage repair of roller compacted concrete dam by overlapping holes construction as claimed in claim 1, characterized in that: During the construction of the concrete filling layer in step 1 and step 3, the roller compacted concrete is first poured to form the roller compacted concrete E zone (4), and then the modified concrete is poured to form the modified concrete F zone (3), and then the modified concrete F zone (3) is fully vibrated.

3. The method for anti-seepage repair of roller compacted concrete dam by overlapping holes construction as claimed in claim 2, characterized in that: The stacked hole anti-seepage structure comprises a row of I-sequence holes (1) and a row of II-sequence holes (2) arranged at the boundary line (7) between the roller compacted concrete and the deformed concrete, the I-sequence holes (1) and the II-sequence holes (2) are both circular holes arranged in the vertical direction, and each II-sequence hole (2) connects two adjacent I-sequence holes (1); The I-order holes (1) are provided with fillers A, and the II-order holes (2) are provided with fillers B.

4. The method for anti-seepage repair of roller compacted concrete dam by overlapping holes construction as claimed in claim 3, characterized in that: The center of the hole (1) of sequence I is located on the boundary (7) between the roller compacted concrete and the deformed concrete, and two adjacent holes (1) of sequence I are tangent to each other; The center of the II-order hole (2) coincides with the tangent point of two adjacent I-order holes (1), and the diameter of the II-order hole (2) is not greater than half the diameter of the I-order hole (1).

5. The method for anti-seepage repair of roller compacted concrete dam by overlapping holes construction as claimed in claim 3, characterized in that: The sizes of the I-order pore (1) and the II-order pore (2) satisfy the formula (1): Simplifying formula (1), we get formula (2) as follows: Where H1 is the maximum distance from the point on the circle of the deformed concrete F zone (3) on the I-sequence hole (1) to the dividing line (7), H2 is the maximum distance from the point on the circle of the RCC E zone (4) on the I-sequence hole (1) to the dividing line (7), D is the diameter of the I-sequence hole (1), and L is min is the minimum design width of the deformed concrete F zone (3), L max is the maximum design width of the deformed concrete F zone (3), d is the diameter of the II sequence hole (2), r is the radius of the II sequence hole (2), H3 is the distance from the bottom of the II sequence hole (2) to the bottom of the I sequence hole (1), H4 is the depth of the II sequence hole (2), and H is the layer height of the concrete filling layer.

6. The method for anti-seepage repair of roller compacted concrete dam by overlapping holes construction as claimed in claim 3, characterized in that: The filler A is modified concrete, and the modified concrete is poured into the I-sequence hole (1) to form a modified concrete K zone (5).

7. The method for anti-seepage repair of roller compacted concrete dam by overlapping holes construction as claimed in claim 3, characterized in that: The filler B is cement mortar, and the cement mortar is poured into the II sequence hole (2) to form a cement mortar Q zone (6).

8. The method for anti-seepage repair of roller compacted concrete dam by overlapping holes construction as claimed in claim 3, characterized in that: The construction method of the stacked hole anti-seepage structure comprises the following steps: Step A, marking the boundary line (7) between the roller compacted concrete zone E (4) and the modified concrete zone F (3) at the construction joint; Step B, drilling the sequence I hole (1) at the dividing line (7), then pouring the modified concrete into the sequence I hole (1), and fully vibrating to form the modified concrete K zone (5); Step C, drilling the II sequence hole (2) at the dividing line (7), then pouring cement mortar into the II sequence hole (2), and fully vibrating to form a cement mortar Q zone (6); Step D: Maintaining the surface of the RCC dam can complete the leakage repair work at the junction of the RCC E area (4) and the deformed concrete F area (3).

9. The method for anti-seepage repair of roller compacted concrete dam by overlapping holes construction as claimed in claim 8, characterized in that: The construction of the stacked hole anti-seepage structure is completed before the initial setting of the roller compacted concrete zone E (4) and the deformed concrete zone F (3).

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