Dam panel damage repairing structure and construction method

Abstract

The invention discloses a dam panel damage repairing structure and a construction method thereof.The construction method comprises the steps that the void condition of a dam panel is preliminarily detected, void detection is conducted on a concrete panel through a first detection device, positioning marking is conducted on the position with the void phenomenon, the void position is rechecked, and the void range and depth are determined; then, a construction groove is formed according to the disengaging position, a plurality of inclined channels are obliquely drilled in the side edge of the construction groove through a drilling piece to communicate with the disengaging position, after reinforcing pieces are arranged in the inclined channels, grouting is conducted on the disengaging area, inspection is conducted through a first detection device or a second detection device after grouting is completed, and after inspection is qualified, construction is completed. According to the construction method, the void area is filled under the condition that the dam panel is not damaged in a large area, meanwhile, the dam panel damage repairing structure reinforces connection between the dam panel and the void area, sufficient support is provided for the dam panel, and the crack resistance of the dam panel is indirectly improved.

Description

Technical Field

[0001] The invention relates to a dam panel damage repair structure and a construction method thereof. Background Art

[0002] Concrete panel rockfill dam is a type of dam developed after the 1960s. It is widely used around the world due to its good economy and convenient construction. Currently, the world's tallest Shuibuya concrete panel anti-seepage project (maximum dam 233m) was completed in 2011, and the Houziyan concrete panel dam project with a maximum dam height of 223.5m is under construction.

[0003] For high concrete face rockfill dams, construction defects, uneven deformation of the dam body and other factors can cause the face plate to become hollow; for concrete face rockfill dams in strong earthquake zones, the face plate can also become hollow under the action of earthquake loads. After the face plate becomes hollow, the reinforced concrete face plate is very likely to break under the action of water loads in front of the dam, affecting the safe operation of the project.

[0004] At present, the commonly used repair measures for panel hollowing at home and abroad are to chisel out the broken panels, fill the hollow area and then re-cast the panels. This method has low construction efficiency and high investment, and there are many uncertainties as to whether the re-cast panels will be well combined with the old panels. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a dam panel damage repair structure and construction method, which can fill the void area without damaging the dam panel on a large scale. At the same time, the dam panel damage repair structure strengthens the connection between the dam panel and the void area, provides sufficient support for the dam panel, and indirectly improves the crack resistance of the dam panel.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a construction method for repairing a dam panel damage structure, wherein the concrete panel damage is a hollowing phenomenon, comprising the following steps:

[0007] 1) Preliminary detection of the dam panel hollowing condition, using the first detection device to detect the hollowing of the concrete panel and mark the location where the hollowing phenomenon exists;

[0008] 2) Rechecking the empty position, rechecking the empty position of the positioning mark by a second detection device and determining the empty range and depth;

[0009] 3) According to the location of the concrete panel where the void is located, it is divided into two situations:

[0010] ①The void position is at the center or near the center of the concrete slab. A construction groove is formed by cutting at a certain distance from the center of the void position, and the thickness of the construction groove is less than the thickness of the concrete slab.

[0011] ②When the void position is not at the center, find multiple existing construction joints at the outer edge closest to the void position. Demolish the waterstop structure at the construction joints, and after demolition, trim and clean the original construction joints to form a construction groove.

[0012] 4) Calculate the depth of the inclined drilling of the drilling component according to the depth of the void area, the width of the construction groove, and the thickness of the slab. The drilling component is obliquely drilled along the construction groove to form multiple inclined channels connecting the void position.

[0013] 5) Reinforcement components are placed in the inclined channels. A plugging grouting port is provided at the end of the reinforcement connection, and the plugging grouting port is fitted with the opening of the inclined channel.

[0014] 6) A deformation detector is installed on the concrete slab. The deformation detector is used to control the grouting volume to avoid the concrete slab bulging. The plugging grouting port is connected to a grouting pump through a grouting pipe, and the void position is filled.

[0015] 7) After filling, the grouting pipe is removed. After removal, wait for the grout to solidify. After solidification, clean the construction groove to maintain flatness.

[0016] 8) Use the first detection device or the second detection device to inspect the void area, and no void phenomenon is detected.

[0017] 9) After passing the inspection, perform waterstop treatment and reinforcement on the construction groove.

[0018] Furthermore, in step 4), it also includes detecting whether the first inclined channel successfully drills into the void position. A micro camera is inserted into the inclined channel for detection, and through the camera shooting, the subsequent inclined drilling plan and the depth of the void area are further determined.

[0019] Furthermore, the construction joints in step 3) include vertical joints, horizontal joints, and peripheral joints. If the construction joints are smaller than the required width of the construction groove, they need to be cut, and the outer end face of the construction groove is inclined outward.

[0020] Further, in step 4), the drilling member includes a guiding and supporting seat, which is configured with an oblique adjusting member for adjusting the height and inclination of the guiding and supporting seat. A guiding cavity for placing the spliced drill pipe is provided on the guiding and supporting seat. A driving member for driving the spliced drill pipe to rotate is configured on the guiding and supporting seat. The driving member is connected with a pushing member through a bracket. The pushing member is installed on the outer wall of the guiding and supporting seat and is used to push the spliced drill pipe into the ground. The pushing member, the oblique adjusting member, and the driving member are all controlled by a controller, and the controller is configured with an intelligent display screen for control.

[0021] Further, the first detection device and the second detection device in step 1) and step 2) are one of acoustic wave induction detection, vibration sensing detection, and LTD ground penetrating radar.

[0022] Further, in step 5), the reinforcing member is a steel bar. A plurality of conical tips are welded to the outer end surface of the steel bar, and a plugging grouting nozzle is provided at one end of the steel bar away from the void position.

[0023] Further, in step 9), the water stop treatment includes applying a waterproof coating to the construction groove. After the waterproof coating dries, a rubber water stop strip is placed and fixed in position with waterproof glue. Then, a precast block with a water stop plate inside is used, and the precast block is fixed by injecting concrete into the joint.

[0024] A dam panel damage repair structure is obtained by constructing according to the construction method of the dam panel damage repair structure.

[0025] Beneficial effects:

[0026] 1. The present application provides a construction method for a dam panel damage repair structure. By opening a construction groove and drilling on the side of the construction groove to communicate with the void position, the thickness of the construction groove is less than the thickness of the concrete panel, ensuring that the construction groove does not directly communicate with the cushion layer, thereby preventing external seepage water from directly infiltrating into the cushion layer. This avoids the problems of poor bonding between the new and old panels caused by large-area chiseling of the panel in the prior art, easy seepage from the bonding position, and low construction efficiency.

[0027] 2. The construction method of the present application drills from the side of the construction groove to communicate with the void position, drills from a firm and stable position to open the construction groove and drill from the side to the void position for grouting to repair the void position, and can perform reinforcement and waterproof treatment on the construction groove. This avoids the problems in the prior art of drilling from the fragile position directly above the void position, which is easy to cause damage, and the subsequent waterproof treatment of the hole still has the problem of waterproof treatment failure due to long-term water flow scouring, resulting in seepage, and it is easy to seep into the dam body from the joint between the new and old panels.

[0028] 3. The dam panel damage repair structure provided by the present application fills the void position while providing support for the dam panel at the void position again, and inserts a reinforcement member into the drilling channel, further enhancing the connection strength between the dam panel, the cushion layer, and the void position. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flow chart of the construction method;

[0030] Figure 2 It is a schematic diagram of the dam panel repair;

[0031] Figure 3 is Figure 2 a partial enlarged schematic diagram of part A in

[0032] Figure 4 It is a schematic diagram of the void position being in a non - central position;

[0033] Figure 5 It is a schematic diagram of the void position being in the central position;

[0034] Figure 6 It is a schematic diagram of the drilling member;

[0035] Figure 7 It is a partial schematic diagram of the drilling member from another perspective;

[0036] Figure 8 It is a schematic diagram of the bracket.

[0037] Reference numerals: 1, construction groove; 2, drilling member; 21, guiding support seat; 22, oblique adjusting member; 23, guiding cavity; 24, driving member; 25, pushing member; 26, intelligent display screen; 27, bracket; 3, void position; 4, waterproof coating; 5, rubber water stop strip; 6, precast block; 7, water stop plate; 8, concrete panel; 9, reinforcement member; 10, drill pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features, and their effects of the present invention as follows.

[0039] Referring to Figures 1-8 as shown, the present application provides a construction method for a dam panel damage repair structure. This construction method is applicable to the damage problem where there is no substantial damage on the surface of the dam panel but there is a void phenomenon between the dam panel and the cushion layer. For this damage problem, the specific construction method includes:

[0040] Preliminarily detect the void situation of the dam panel. Use the first detection device to detect the void in the concrete panel 8 and locate and mark the positions where voids exist. Use a marker pen for marking to arrange for subsequent staff to recheck the marked positions. Use the second detection device to recheck the void positions 3 marked and determine the void range and depth, so as to clearly understand whether there are void positions 3 at this location. In the case of the existence of void positions 3, detect the void range and depth to provide a data basis for the subsequent steps. For the second detection device and the first detection device, acoustic induction detection, vibration sensing detection, LTD ground penetrating radar or other data that can detect the void positions 3 and the void area are all acceptable. Acoustic induction detection, vibration sensing detection, and LTD ground penetrating radar all belong to the existing technologies and will not be elaborated here. After the void area is determined through the detection by the second detection device, it is processed in two cases according to the void area and the position on the concrete panel 8.

[0041] Figure 4 As shown, in the first case, the void position 3 is at or near the center of the concrete panel 8, resulting in a relatively long distance between the void position 3 and the construction joint, making it difficult for subsequent inclined drilling. Therefore, in this application, construction grooves 1 are formed by cutting at a certain distance from the void position 3. The shape of the construction groove 1 is diverse, as long as it can enclose the void position 3, ensuring that inclined drilling on the side wall of the construction groove 1 can penetrate into the void area. The construction groove 1 is as Figure 3 、 Figure 4 shown, and is preferably selected as a rectangle (hereinafter, the construction groove 1 will be taken as an example of a rectangle).

[0042] Figure 3 As shown, in the second case, the void position 3 is at a non - central position. Search for multiple original construction joints at the outer edge closest to the void position 3. Taking the outer edge closest to the void position 3 as the main one, demolish the water - stop structure at the construction joint. After demolition, repair and clean the original construction joint to form a construction groove 1. The shape of the construction groove 1 is still taken as an example of a rectangle. The original construction joint may be a vertical joint, a horizontal joint, or a peripheral joint. When the width of the original construction joint is less than the required width of the construction groove 1, it needs to be cut. The outer end face of the construction groove 1 is inclined outward to facilitate the subsequent construction steps.

[0043] Calculate the depth of the inclined drilling of the drilling member 2 according to the depth of the void range, the width of the construction groove 1, and the thickness of the panel. Add the depth of the void range to the thickness of the panel as the vertical length, and add half of the width of the construction groove 1 to the distance from the center of the void position 3 to the construction groove 1 as the horizontal length. Using the Pythagorean theorem, the length of the hypotenuse is deduced, and the length of the hypotenuse is the depth of the drilling. The drilling member 2 is obliquely drilled along the side wall of the construction groove 1 to form multiple oblique channels to communicate with the void position 3. After the first oblique channel drilling is completed, in order to verify whether the oblique channel has successfully penetrated into the void position 3, a micro camera is inserted into the oblique channel for detection, and the void range and the depth of the drilling are further determined through the camera shooting.

[0044] As Figures 6-8 shown, the drilling member 2 includes a guiding and supporting seat 21, and the guiding and supporting seat 21 is configured with an oblique adjusting member 22. The oblique adjusting member 22 is used to adjust the height and inclination of the guiding and supporting seat 21. The oblique adjusting member 22 is driven by a hydraulic rod, and the overall inclination of the guiding and supporting seat 21 is controlled by the lifting of the hydraulic rod. A guiding cavity 23 for placing the spliced drill pipe is provided on the guiding and supporting seat 21. A driving member 24 for driving the spliced drill pipe to rotate is configured on the guiding and supporting seat 21. The driving member 24 is a motor, and a clamping sleeve is provided on the driving rod of the motor. The clamping sleeve is used to connect with the tail of the drill pipe, so as to realize the synchronous rotation of the drill pipe. In order to ensure the position of the drill pipe, a limiting ring is provided in the guiding cavity 23, and the diameter of the limiting ring can be adjusted to adapt to drill pipes of different sizes. The 10 motor is connected with a pushing member 25 through a bracket 27. A clamping groove for stably placing the motor is provided on the bracket 27 to ensure the stability of the motor and avoid shaking. A guiding cavity 23 is provided in the guiding cavity 23 for guiding and sliding the bracket 27 to avoid deviation. The pushing member 25 is installed on the outer wall of the guiding and supporting seat 21. There are multiple groups of pushing members, preferably 6 groups, to ensure sufficient driving force. The pushing member is a hydraulic telescopic rod, and the hydraulic telescopic rod is connected with the bracket 27. The bracket 27 is pushed through the hydraulic telescopic rod to realize the drilling of the drill pipe. The pushing member, the oblique adjusting member 22, and the driving member 24 are all provided with controllers and are electrically connected. The controller is installed behind the guiding and supporting seat 21, and a rear cover is provided at the rear to cover its circuit components. The controller is configured with an intelligent display screen 26, and the drilling of the drill pipe is realized by clicking the corresponding start on the intelligent display screen 26. The spliced drill pipe is a prior art and will not be elaborated here.

[0045] After the multi-channel inclined drilling channels are drilled, reinforcement members 9 are placed in all the inclined channels. The end of the reinforcement member 9 is provided with a plugging grouting port, and the plugging grouting port is fitted with the opening of the inclined channel. The reinforcement member 9 is a steel bar, and a plurality of conical tips are welded to the outer end surface of the steel bar. One end of the steel bar away from the void position 3 is provided with a plugging grouting nozzle, and the grouting nozzle is connected to a grouting pump through a grouting pipe. When starting grouting, a deformation detector is installed on the concrete panel 8, and the initial data of the concrete panel 8 is detected and recorded by the deformation detector. Then, grouting is started to grout the void area. During the grouting process, the force on the concrete panel 8 is detected by the deformation detector to avoid the convexity of the concrete panel 8 caused by excessive grouting. At the same time, in this application, grouting is carried out through a plurality of grouting ports, which fully ensures the filling of the blind areas in the void area and avoids the problems of slow grouting speed and insufficient grouting of a single grouting port.

[0046] After the filling is completed, the grouting pipe is removed. After removal, wait for the slurry to solidify. After solidification, clean the construction groove 1 to ensure flatness, and use the first detection device or the second detection device to inspect the void area to ensure that the void area is filled.

[0047] After passing the inspection, water stop treatment and reinforcement are carried out on the construction groove 1. The water stop treatment includes applying a waterproof coating 4 to the construction groove 1. After the waterproof coating 4 dries, a rubber water stop strip 5 is placed and fixed in position with waterproof glue. Then, a precast block 6 with a water stop plate 7 inside is used, and the precast block 6 is fixed through concrete injection joints to strengthen the anti-seepage measures of the construction groove 1. Although the construction groove 1 does not communicate with the cushion layer, the opening of the construction groove 1 causes the thickness at this position to become smaller and be in a relatively weak position. Therefore, water stop treatment and reinforcement are carried out to improve the strength of this position and ensure the anti-seepage ability at this place.

[0048] Refer to as Figure 3 shown, the present application also provides a dam panel damage repair structure, and this structure is obtained through the construction method of the dam panel damage repair structure.

[0049] The above is only a preferred embodiment of the present invention, and it is not a limitation to the present invention in any form. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to be equivalent embodiments with equivalent changes, but as long as it does not depart from the technical content of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A construction method for a repair structure of a damaged dam panel, where the damage to the concrete panel is the phenomenon of voiding, characterized in that, It includes the following steps: 1) Initially detect the void situation of the dam panel, detect the void of the concrete panel through the first detection device and locate and mark the positions with void phenomena; 2) Recheck the void positions, recheck the void positions marked by the second detection device and determine the void range and depth; 3) Deal with it in two cases according to the position of the void in the concrete panel: ① When the void position is at or near the center of the concrete panel, a construction groove is formed by chiseling at a certain distance from the void position, and the thickness of the construction groove is less than the thickness of the concrete panel; ② When the void position is at a non - center position, find multiple original construction joints at the outer edge closest to the void position. Taking the outer edge closest to the void position as the main one, remove the water - stop structure at the construction joint. After removal, trim and clean the original construction joint to form a construction groove; 4) Calculate the depth of the inclined drilling of the drilling component according to the void range and depth, the width of the construction groove, and the thickness of the panel. The drilling component is obliquely drilled along the construction groove to form multiple inclined channels to connect the void positions; 5) Place reinforcement components in all the inclined channels. The end of the reinforcement component is provided with a plugging grouting port, and the plugging grouting port is fitted with the opening of the inclined channel; 6) Install a deformation detector on the concrete panel. The deformation detector is used to control the grouting volume to avoid the convexity of the concrete panel. Connect the plugging grouting port to a grouting pump through a grouting pipe and fill the void position; 7) After filling, remove the grouting pipe. After removal, wait for the slurry to solidify. After solidification, clean the construction groove to keep it flat; 8) Use the first detection device or the second detection device to inspect the void area, and detect that there is no void phenomenon; 9) After passing the inspection, carry out water - stop treatment and reinforcement on the construction groove.

2. The construction method of the dam panel damage repair structure according to claim 1, characterized in that, In step 4), it also includes detecting whether the first inclined channel successfully drills into the void position. A micro - camera is inserted into the inclined channel for detection, and through the camera shooting, further determine the planning of the subsequent inclined drilling and the void range and depth.

3. The construction method of the dam panel damage repair structure according to claim 2, characterized in that, In step 3), the construction joints include vertical joints, horizontal joints, and peripheral joints. If the construction joint is smaller than the required width of the construction groove, it needs to be cut, and the outer end face of the construction groove is inclined outward.

4. The construction method of the dam panel damage repair structure according to claim 3, characterized in that: In step 4), the drilling component includes a guiding support base. The guiding support base is configured with an inclined adjusting component for adjusting the height and inclination of the guiding support base. There is a guiding cavity on the guiding support base for placing the spliced drill pipe. The guiding support base is configured with a driving component for driving the spliced drill pipe to rotate. The driving component is connected with a propulsion component through a bracket. The propulsion component is installed on the outer wall of the guiding support base. The propulsion component is used to push the spliced drill pipe into drilling. The propulsion component, the inclined adjusting component, and the driving component are all controlled by a controller, and the controller is configured with an intelligent display screen for control.

5. The construction method of the dam panel damage repair structure according to claim 4, characterized in that: In steps 1) and 2), the first detection device and the second detection device are one of acoustic wave induction detection, vibration sensing detection, and LTD ground - penetrating radar.

6. The construction method of the dam panel damage repair structure according to claim 5, characterized in that: In step 5), the reinforcement component is a steel bar. Multiple conical tips are welded on the outer end face of the steel bar, and a plugging grouting nozzle is provided at one end of the steel bar away from the void position.

7. The construction method of the dam panel damage repair structure according to claim 6, characterized in that: In step 9), the water stop treatment includes applying waterproof coating to the construction groove. After the waterproof coating dries, a rubber water stop strip is placed and its position is fixed with waterproof glue. Then, a precast block with a water stop plate inside is used, and the precast block is fixed by injecting concrete into the joint.

8. A repair structure for the damage of a dam panel, characterized in that: Constructed according to the construction method of the dam panel damage repair structure according to any one of claims 1-7.

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