Dam foundation exploration shaft sealing structure

Abstract

This utility model provides a sealing structure for a dam foundation exploration shaft, comprising a silt and debris reinforcement layer located in the lower section of the shaft and a reinforced concrete sealing body located in the upper section of the shaft. The silt and debris reinforcement layer includes compacted original silt and debris, with grouting holes formed in the original silt and debris, into which cement mortar is injected. The reinforced concrete sealing body includes reinforcing anchors, a steel mesh, a backfill concrete layer, and a cast-in-place concrete layer. This utility model preserves the silt and debris in the lower and middle sections of the dam foundation exploration shaft, solving the problem of difficult silt and debris removal within the shaft, improving the safety of exploration shaft sealing construction, reducing the amount of sealing concrete work, and meeting the requirements of dam foundation for exploration shaft sealing. This utility model has a wide range of applications and significant technical and economic advantages.

Description

Technical Field

[0001] This utility model relates to the technical field of sealing structure for vertical shafts in dam foundation exploration, and specifically to a sealing structure for vertical shafts in dam foundation exploration. Background Technology

[0002] To ensure the safety of the dam foundation, dam foundation exploration tunnels, shafts, and boreholes are generally sealed using methods such as concrete pouring, backfilling with grout, or injecting cement mortar. For dam foundation exploration shafts with large cross-sectional dimensions and depths, there are issues such as the large amount of concrete required for sealing. Utility Model Content

[0003] In view of the shortcomings of the existing technology, this utility model provides a sealing structure for dam foundation exploration shafts, which can effectively solve the above problems.

[0004] The technical solution adopted in this utility model is as follows:

[0005] This utility model provides a sealing structure for a dam foundation exploration shaft, including a siltation and debris reinforcement layer (2) located in the lower section (1) of the shaft and a reinforced concrete sealing body (4) located in the upper section (3) of the shaft;

[0006] The siltation and debris reinforcement layer (2) includes the original siltation and debris (2.1) compacted by ramming. Grouting holes (2.2) are opened in the original siltation and debris (2.1), and cement mortar is injected into the grouting holes (2.2).

[0007] Preferably, the reinforced concrete sealing body (4) includes reinforcing anchor rods (4.1), steel mesh, backfill concrete layer (4.2), and cast-in-place concrete layer (4.3);

[0008] Multiple reinforcing anchors (4.1) are installed in the upper section (3) of the shaft. The top of the reinforcing anchor (4.1) is located in the upper section (3) of the shaft, and the bottom of the reinforcing anchor (4.1) is anchored into the silt and debris reinforcement layer (2). The steel mesh is installed on the shaft wall and bottom of the upper section (3). Inside the steel mesh, the backfill concrete layer (4.2) and the cast-in-place concrete layer (4.3) are installed sequentially from bottom to top.

[0009] Preferably, the reinforcing mesh includes bottom horizontal reinforcing bars (4.4), side wall vertical reinforcing bars (4.5), and side wall horizontal reinforcing bars (4.6);

[0010] At the bottom of the upper section (3) of the shaft, multiple bottom horizontal steel bars (4.4) are evenly laid; on the shaft wall of the upper section (3), multiple side wall vertical steel bars (4.5) are evenly laid; outside the side wall vertical steel bars (4.5), multiple side wall horizontal steel bars (4.6) are tied along the height direction.

[0011] Preferably, the ends of the bottom horizontal steel bar (4.4) and the bottom of the side wall vertical steel bar (4.5) are tied and fixed.

[0012] Preferably, the top of the vertical reinforcement (4.5) on the side wall is higher than the top elevation of the exploration shaft.

[0013] Preferably, the top layer of the horizontal steel bars (4.6) on the side wall is located at the top elevation of the exploration shaft.

[0014] Preferably, the height of the cast-in-place concrete layer (4.3) is 1 meter; the top surface of the cast-in-place concrete layer (4.3) is at the same elevation as the top of the exploration shaft.

[0015] Preferably, the cast-in-place concrete layer (4.3) is cast together with the concrete of the dam section bottom slab.

[0016] The dam foundation exploration shaft sealing structure provided by this utility model has the following advantages:

[0017] This invention preserves the accumulated debris in the middle and lower sections of the dam foundation exploration shaft, solving the problem of difficult debris removal within the shaft, improving the safety of the exploration shaft sealing construction, reducing the amount of sealing concrete work, and meeting the dam foundation's requirements for exploration shaft sealing. This invention has a wide range of applications and significant technical and economic advantages. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of a dam foundation exploration shaft sealing structure according to the present invention;

[0019] Figure 2 for Figure 1 AA cross-section view. Detailed Implementation

[0020] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] See Figure 1 and Figure 2 The present invention provides a sealing structure for a dam foundation exploration shaft, including a siltation and debris reinforcement layer 2 located in the lower section 1 of the shaft and a reinforced concrete sealing body 4 located in the upper section 3 of the shaft;

[0022] The silt and debris reinforcement layer 2 includes the original silt and debris 2.1, which has been compacted by tamping. Grouting holes 2.2 are opened in the original silt and debris 2.1, and cement mortar is injected into the grouting holes 2.2. That is to say, in this application, the original silt and debris 2.1 in the lower section 1 of the shaft is retained, the original silt and debris 2.1 is compacted by tamping, and cement mortar is injected to improve the bearing capacity of the silt and debris.

[0023] The reinforced concrete sealing body 4 includes reinforcing anchor bolts 4.1, steel mesh, backfill concrete layer 4.2, and cast-in-place concrete layer 4.3;

[0024] Multiple reinforcing anchor bolts 4.1 are installed in the upper section 3 of the shaft. The top of the reinforcing anchor bolts 4.1 is located in the upper section 3 of the shaft, and the bottom of the reinforcing anchor bolts 4.1 is anchored into the silt and debris reinforcement layer 2. A steel mesh is installed on the shaft wall and bottom of the upper section 3. Inside the steel mesh, a backfill concrete layer 4.2 and a cast-in-place concrete layer 4.3 are installed sequentially from bottom to top. The height of the cast-in-place concrete layer 4.3 is 1 meter; the top surface of the cast-in-place concrete layer 4.3 is at the same elevation as the top of the exploration shaft. The cast-in-place concrete layer 4.3 is poured together with the dam section bottom slab concrete.

[0025] The reinforcing mesh includes bottom horizontal reinforcing bars 4.4, side wall vertical reinforcing bars 4.5, and side wall horizontal reinforcing bars 4.6;

[0026] At the bottom of the upper section 3 of the shaft, multiple horizontal reinforcing bars 4.4 are evenly laid; at the shaft wall of the upper section 3, multiple vertical reinforcing bars 4.5 are evenly laid; outside the vertical reinforcing bars 4.5, multiple horizontal reinforcing bars 4.6 are tied along the height direction. Furthermore, the ends of the bottom horizontal reinforcing bars 4.4 and the bottoms of the vertical reinforcing bars 4.5 are tied and fixed. The top of the vertical reinforcing bars 4.5 is higher than the top elevation of the exploration shaft. The uppermost layer of the horizontal reinforcing bars 4.6 is located at the top elevation of the exploration shaft.

[0027] This utility model provides a sealing structure for a dam foundation exploration shaft. For the lower and middle sections of the exploration shaft, accumulated debris is retained and compacted, then filled with cement mortar to improve its bearing capacity, reducing the difficulty and risk of manual dredging. For the upper section of the shaft, accumulated debris is cleaned layer by layer from top to bottom. The shaft wall is reinforced with mesh, shotcrete, and reinforcing anchors. A reinforced concrete sealing body is installed in the upper section to improve its bearing capacity. Therefore, the reinforced concrete sealing body is located in the upper section of the shaft, with steel mesh at the bottom and around its perimeter. The reinforced concrete sealing body, together with the compacted debris below and the surrounding rock, forms a unified structure to bear the pressure from above.

[0028] This invention preserves the accumulated debris in the middle and lower sections of the dam foundation exploration shaft, solving the problem of difficult debris removal within the shaft, improving the safety of the exploration shaft sealing construction, reducing the amount of sealing concrete work, and meeting the dam foundation's requirements for exploration shaft sealing. This invention has a wide range of applications and significant technical and economic advantages.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A dam foundation exploration shaft sealing structure, characterized by, It includes a siltation and debris reinforcement layer (2) located in the lower section (1) of the shaft and a reinforced concrete sealing body (4) located in the upper section (3) of the shaft. The siltation and debris reinforcement layer (2) includes the original siltation and debris (2.1) compacted by ramming, the original siltation and debris (2.1) having grouting holes (2.2) for filling with cement mortar.

2. The dam foundation exploration shaft sealing structure according to claim 1, characterized in that, The reinforced concrete sealing body (4) includes reinforcing anchors (4.1), steel mesh, backfill concrete layer (4.2), and cast-in-place concrete layer (4.3). Multiple reinforcing anchors (4.1) are installed in the upper section (3) of the shaft. The top of the reinforcing anchors (4.1) is located in the upper section (3) of the shaft, and the bottom of the reinforcing anchors (4.1) is anchored into the silt and debris reinforcement layer (2). The steel mesh is installed on the shaft wall and bottom of the upper section (3). Inside the steel mesh, the backfill concrete layer (4.2) and the cast-in-place concrete layer (4.3) are installed sequentially from bottom to top.

3. The dam foundation exploration shaft sealing structure according to claim 2, characterized in that, The steel mesh includes bottom horizontal steel bars (4.4), side wall vertical steel bars (4.5), and side wall horizontal steel bars (4.6). At the bottom of the upper section (3) of the shaft, multiple bottom horizontal steel bars (4.4) are evenly laid; on the shaft wall of the upper section (3), multiple side wall vertical steel bars (4.5) are evenly laid; outside the side wall vertical steel bars (4.5), multiple side wall horizontal steel bars (4.6) are tied along the height direction.

4. The dam foundation exploration shaft sealing structure according to claim 3, characterized in that, The ends of the bottom horizontal steel bar (4.4) and the bottom of the side wall vertical steel bar (4.5) are tied and fixed.

5. The dam foundation exploration shaft sealing structure according to claim 3, characterized in that, The top of the vertical reinforcing bars (4.5) on the side wall is higher than the top elevation of the exploration shaft.

6. The dam foundation exploration shaft sealing structure according to claim 5, characterized in that, The top layer of the horizontal steel bars (4.6) on the side wall is located at the top elevation of the exploration shaft.

7. The sealing structure for a dam foundation exploration shaft according to claim 2, characterized in that, The height of the cast-in-place concrete layer (4.3) is 1 meter; the top surface of the cast-in-place concrete layer (4.3) is at the same elevation as the top of the exploration shaft.

8. The dam foundation exploration shaft sealing structure according to claim 2, characterized in that, The cast-in-place concrete layer (4.3) is poured together with the bottom slab concrete of the dam section.

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