A concrete gravity dam corridor construction method and device

Abstract

The present invention relates to the field of corridor construction technology, specifically a method and device for corridor construction of a concrete gravity dam, comprising the following steps: Step 1, excavating and cleaning the dam foundation, while simultaneously casting a circular base, reserving a thermal insulation corridor and a grouting corridor inside the circular base; Step 2, installing the cast circular base on the dam foundation as the bottom layer of the gravity dam; Step 3, casting an anti-seepage curtain through the grouting corridor, and directly casting the gravity dam body without waiting for the anti-seepage curtain to completely cool down. The concrete gravity dam corridor construction method and device, by setting a circular base at the bottom layer of the gravity layer, can simultaneously cast the anti-seepage curtain and the gravity dam body, without waiting for the corridor inside the gravity dam body to cool down and form before construction, and the thermal insulation corridor inside the circular base can slow down the bottom temperature loss rate during casting, reducing the temperature difference between the inside and outside of the gravity dam body.

Description

Technical Field

[0001] The present invention relates to the technical field of corridor construction, in particular to a concrete gravity dam corridor construction method and a device thereof. Background Art

[0002] Concrete gravity dams are constructed of concrete and rely primarily on the anti-slip force generated by their own weight to maintain their stability. Based on the different construction methods, they can be divided into cast-in-place concrete gravity dams and roller-compacted concrete gravity dams. In concrete gravity dams, corridors for various purposes are required to meet the needs of grouting, drainage, observation, and dam maintenance. A concrete gravity dam consists of a dam body, a crest structure, anti-seepage and drainage facilities, joints and waterstops, and corridors within the dam. Curtain grouting aims to reduce the seepage pressure at the dam foundation, prevent mechanical or chemical piping within the dam foundation, and reduce the amount of water seeping from the dam foundation. It has always been the primary method for anti-seepage treatment of dam foundations and plays an important role in ensuring the safe operation of dams.

[0003] However, curtain grouting is limited by the corridor itself, and the anti-seepage curtain must be poured only after a certain thickness of dam concrete has been poured. This significantly slows construction progress and makes it difficult to meet the needs of tight construction schedules. Furthermore, the internal temperature of a gravity dam is high during concrete pouring, and the cooling rate is slow. The bottom, due to its proximity to the water source, loses temperature quickly, resulting in a large temperature difference between the inside and outside, which can easily cause cracking. In light of this, we propose a method and apparatus for corridor construction in a concrete gravity dam. Summary of the Invention

[0004] The object of the present invention is to provide a concrete gravity dam gallery construction method and device thereof, which solve the problems in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A concrete gravity dam corridor construction method comprises the following steps:

[0007] Step 1: Excavate and clean the dam foundation, and at the same time, cast the circular base, reserving insulation corridors and grouting corridors inside the circular base;

[0008] Step 2: Install the cast circular base on the dam foundation as the bottom layer of the gravity dam;

[0009] Step 3: Cast the anti-seepage curtain through the grouting gallery. After casting, there is no need to wait for the anti-seepage curtain to completely cool down, and the main body of the gravity dam can be cast directly;

[0010] Step 4: After the gravity dam body is completely cooled, fill the insulation corridor inside the circular base.

[0011] Preferably, the circular base is pre-embedded with a steel frame before casting.

[0012] Preferably, the steel bar skeleton is composed of longitudinal steel bars arranged at equal intervals, and the top ends of the steel bars pass through the circular base.

[0013] Preferably, the circular base is pre-buried with filling pipes before pouring.

[0014] Preferably, the filling pipe is a longitudinal steel pipe, and the top end of the filling pipe passes through the gravity dam body.

[0015] Preferably, the steps for casting the circular base are as follows:

[0016] Step 1: Fix the two first side panels to the two ends of the bottom plate, then fix the two ends of the corridor enclosure to the two first side panels, then fix the first frame and the second frame to the two sides of the corridor enclosure, and fix the two ends of the first frame and the second frame to the two first side panels. Finally, fix the two second side panels between the two first side panels to form a grouting area.

[0017] Step 2: Insert the steel bars into the second frame from top to bottom, so that the bottom ends of the steel bars pass through the upper and lower sides of the second frame, and then weld the steel bars to the second frame. Then, insert the bottom end of the filling pipe into the second frame from top to bottom, so that the filling pipe passes through the top surface of the second frame, and then weld the filling pipe to the second frame.

[0018] Step 3: Pour cement mortar into the grouting area and vibrate it to ensure that the cement mortar is evenly filled in the grouting area;

[0019] Step 4: After the cement mortar cools down, remove the first side panel, the second side panel and the bottom panel to form a circular base.

[0020] Preferably, the grouting method in step 3 is as follows: first, pour cement mortar downward from the left side of the first frame and the right side of the second frame at the same time, and vibrate the two second side panels with a concrete vibrator so that the cement mortar is evenly laid on the bottom of the first frame and the second frame. When the top surface of the cement mortar is flush with the top surface of the first frame and the second frame, the cement mortar is laid by swinging back and forth left and right until the top surface of the mortar is flush with the top surface of the first side panel.

[0021] Preferably, the filling material in step 4 is cement mortar, and the filling method is pressure grouting.

[0022] Preferably, the filling material in step 4 is foamed polyurethane insulation material.

[0023] A concrete gravity dam gallery construction device includes a circular base, which is a prefabricated concrete part. The interior of the circular base has a thermal insulation gallery, the interior of the circular base has a grouting gallery, the top of the circular base is penetrated and plugged with a filling pipe, and the top of the circular base is penetrated and plugged with a steel frame.

[0024] By means of the above technical solution, the present invention provides a concrete gravity dam corridor construction method and apparatus thereof, which has at least the following beneficial effects:

[0025] (1) The concrete gravity dam corridor construction method and device thereof can simultaneously cast the anti-seepage curtain and the gravity dam body by setting a circular base at the lowest gravity layer, without having to wait for the corridor inside the gravity dam body to cool and form before construction, thereby effectively improving construction efficiency and shortening construction period. In addition, the heat-insulating corridor is set inside the circular base, which can reduce the temperature influence of the dam foundation on the gravity dam body and slow down the cooling rate of the bottom during casting, thereby reducing the temperature difference between the inside and outside of the gravity dam body and preventing cracking of the bottom.

[0026] (2) The concrete gravity dam corridor construction method and device thereof can improve the hardness of the circular base itself by setting a steel skeleton inside the circular base, making it more heat-resistant. At the same time, it also improves the connection strength between the gravity dam body and the circular base after pouring, making the two more stable.

[0027] (3) The concrete gravity dam corridor construction method and device thereof can strengthen the overall strength of the circular base by filling the insulation corridor inside the circular base at the end of construction. By selecting different filling materials, the sealing and heat preservation effects can also be achieved.

[0028] (4) The concrete gravity dam corridor construction method and device thereof, wherein the circular base is a prefabricated part, can be cast outside the dam foundation, thereby being able to be carried out simultaneously with the excavation and cleaning of the dam foundation, thereby improving construction efficiency and effectively shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a schematic diagram of a template for making a circular base in the present invention;

[0032] In the figure: 1. Gravity dam body; 2. Ring-shaped base; 3. Anti-seepage curtain; 4. Steel skeleton; 5. Grouting gallery; 6. Insulation gallery; 7. Filling pipe; 8. Bottom plate; 9. First side plate; 10. Second side plate; 11. Gallery enclosure; 12. Second frame; 13. First frame. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figure 1-Figure 2 , a technical solution provided by the present invention:

[0035] A concrete gravity dam corridor construction method comprises the following steps:

[0036] Step 1: excavate and clean the dam foundation, and at the same time cast the circular base 2, and reserve a thermal insulation corridor 6 and a grouting corridor 5 inside the circular base 2; carrying out the two at the same time can greatly save time and shorten the construction period.

[0037] Step 2: Install the cast circular base 2 on the dam foundation using expansion bolts as the bottom layer of the gravity dam;

[0038] Step 3: Cast the anti-seepage curtain 3 through the grouting corridor 5. After casting, there is no need to wait for the anti-seepage curtain 3 to completely cool down, and the gravity dam body 1 can be cast directly. The insulation corridor 6 set inside the circular base 2 can avoid direct contact between the dam foundation and the gravity dam body 1, achieving the purpose of thermal insulation, thereby slowing down the temperature loss rate at the bottom of the gravity dam body 1 during casting, reducing the temperature difference between the interior and the bottom of the gravity dam body 1, and preventing concrete cracking. If necessary, hot air can be introduced into the insulation corridor 6 through external equipment to further alleviate the problem of excessive temperature loss at the bottom of the gravity dam body 1. The circular base 2 is pre-embedded with a steel skeleton 4 before casting. The steel skeleton 4 is composed of longitudinal steel bars arranged at equal distances, and the top of the steel bar passes through the circular base 2, thereby increasing the strength between the gravity dam body 1 and the circular base 2, making the connection between the two more stable, while also increasing the hardness of the circular base 2 itself, making it more temperature-resistant.

[0039] Step 4: After the gravity dam body 1 is completely cooled, fill the insulation corridor 6 inside the circular base 2. This can further improve the construction efficiency and speed up the construction progress. The circular base 2 is pre-buried with a filling pipe 7 before pouring. The filling pipe 7 is a longitudinal steel pipe, and the top of the filling pipe 7 passes through the gravity dam body 1. The filling material is cement mortar or foamed polyurethane insulation material. The filling method of cement mortar is pressure grouting. The cement mortar can seal the insulation corridor 6 and form a whole with the circular base 2, further increasing the strength of the circular base 2. The foamed polyurethane insulation material has a good insulation effect, which can improve the insulation effect of the gravity dam and avoid temperature cracks in the gravity dam.

[0040] In this embodiment, the steps for casting the circular base 2 are as follows:

[0041] Step 1: Fix the two first side panels 9 to the two ends of the bottom plate 8, then fix the two ends of the corridor enclosure 11 to the two first side panels 9, then fix the first frame 13 and the second frame 12 to both sides of the corridor enclosure 11, and fix the two ends of the first frame 13 and the second frame 12 to the two first side panels 9. Finally, fix the two second side panels 10 between the two first side panels 9. The bottom plate 8, the first side panel 9, the second side panel 10, the first frame 13, the second frame 12 and the corridor enclosure 11 constitute a base manufacturing template, which together enclose a grouting area.

[0042] Step 2: Insert the steel bars into the second frame 12 from top to bottom so that the bottom ends of the steel bars pass through the upper and lower sides of the second frame 12, and then weld the steel bars to the second frame 12. Subsequently, insert the bottom ends of the filling pipes 7 into the second frame 12 from top to bottom so that the filling pipes 7 pass through the top surface of the second frame 12, and then weld the filling pipes 7 to the second frame 12. The number of steel bars is multiple, and the multiple steel bars are distributed in an equidistant array to form a steel skeleton (4). The number of filling pipes 7 is three to five, and the filling pipes 7 are distributed equidistantly along the length direction of the base template.

[0043] Step 3: Pour cement mortar into the grouting area and vibrate it to ensure that the cement mortar is evenly filled in the grouting area;

[0044] Step 4: After the cement mortar cools down, the first side plate 9, the second side plate 10 and the bottom plate 8 are removed to form the circular base 2.

[0045] Furthermore, the grouting method in step 3 is specifically as follows: first, pour cement mortar downward from the left side of the first frame 13 and the right side of the second frame 12 at the same time, and vibrate the two second side panels 10 with a concrete vibrator, so that the cement mortar is evenly laid on the bottom of the first frame 13 and the second frame 12. In this way, it can be ensured that the bottom of the circular base 2 can be evenly laid with cement mortar. When the top surface of the cement mortar is flush with the top surface of the first frame 13 and the second frame 12, the cement mortar is laid by swinging back and forth left and right to improve the laying efficiency, until the top surface of the mortar is flush with the top surface of the first side panel 9.

[0046] A concrete gravity dam gallery construction device includes a circular base 2, which is a prefabricated concrete part. The interior of the circular base 2 has a thermal insulation gallery 6, the interior of the circular base 2 has a grouting gallery 5, the top of the circular base 2 is penetrated and plugged with a filling pipe 7, and the top of the circular base 2 is penetrated and plugged with a steel skeleton 4.

[0047] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A concrete gravity dam corridor construction method, characterized by: The following steps are involved: Step 1: excavate and clean the dam foundation, and at the same time, cast the circular base (2), and reserve a thermal insulation corridor (6) and a grouting corridor (5) inside the circular base (2); Step 2: Install the cast circular base (2) on the dam foundation as the bottom layer of the gravity dam; Step 3: Casting the anti-seepage curtain (3) through the grouting gallery (5), and directly casting the gravity dam body (1) without waiting for the anti-seepage curtain (3) to completely cool down; Step 4: After the gravity dam body (1) is completely cooled, the thermal insulation corridor (6) inside the circular base (2) is filled.

2. The concrete gravity dam gallery construction method according to claim 1, characterized in that: The circular base (2) is pre-buried with a steel frame (4) before casting.

3. The concrete gravity dam gallery construction method according to claim 2, characterized in that: The steel bar skeleton (4) is composed of longitudinal steel bars arranged at equal intervals, and the top ends of the steel bars pass through the circular base (2).

4. The concrete gravity dam gallery construction method according to claim 1, characterized in that: The circular base (2) is pre-buried with a filling pipe (7) before pouring.

5. The concrete gravity dam gallery construction method according to claim 4, characterized in that: The filling pipe (7) is a longitudinal steel pipe, and the top end of the filling pipe (7) passes through the gravity dam body (1).

6. The concrete gravity dam gallery construction method according to claim 1, characterized in that: The steps of casting the circular base (2) are as follows: Step 1: respectively fix the two first side panels (9) on both ends of the bottom plate (8), then respectively fix the two ends of the corridor enclosure (11) on the two first side panels (9), then respectively fix the first frame (13) and the second frame (12) on both sides of the corridor enclosure (11), and fix the two ends of the first frame (13) and the second frame (12) on the two first side panels (9), and finally fix the two second side panels (10) between the two first side panels (9) to form a grouting area; Step 2: insert the steel bar into the second frame (12) from top to bottom so that the bottom end of the steel bar passes through the upper and lower sides of the second frame (12), and then weld the steel bar to the second frame (12). Then, insert the bottom end of the filling pipe (7) into the second frame (12) from top to bottom so that the filling pipe (7) passes through the top surface of the second frame (12), and then weld the filling pipe (7) to the second frame (12); Step 3: Pour cement mortar into the grouting area and vibrate it to ensure that the cement mortar is evenly filled in the grouting area; Step 4: After the cement mortar cools down, the first side plate (9), the second side plate (10) and the bottom plate (8) are removed to form a circular base (2).

7. The concrete gravity dam gallery construction method according to claim 6, characterized in that: The grouting method in step 3 is specifically as follows: first, pour cement mortar downward from the left side of the first frame (13) and the right side of the second frame (12) at the same time, and vibrate the two second side panels (10) with a concrete vibrator so that the cement mortar is evenly laid on the bottom of the first frame (13) and the second frame (12). When the top surface of the cement mortar is flush with the top surface of the first frame (13) and the second frame (12), the cement mortar is laid by swinging back and forth until the top surface of the mortar is flush with the top surface of the first side panel (9).

8. The concrete gravity dam gallery construction method according to claim 1, characterized in that: The filling material in step 4 is cement mortar, and the filling method is pressure grouting.

9. The concrete gravity dam gallery construction method according to claim 1, characterized in that: The filling material in step 4 is foamed polyurethane thermal insulation material.

10. A concrete gravity dam gallery construction device, characterized by: The invention comprises a circular base (2), wherein the circular base (2) is a prefabricated concrete part, wherein the interior of the circular base (2) is provided with a temperature-insulating gallery (6), wherein the interior of the circular base (2) is provided with a grouting gallery (5), wherein the top of the circular base (2) is penetrated and plugged with a filling pipe (7), and wherein the top of the circular base (2) is penetrated and plugged with a steel frame (4).

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