CN105484205B - Concrete anti-seepage panel reconstruct dam heel cover plate water sealing structure and its construction method - Google Patents
Concrete anti-seepage panel reconstruct dam heel cover plate water sealing structure and its construction method Download PDFInfo
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- CN105484205B CN105484205B CN201511026933.9A CN201511026933A CN105484205B CN 105484205 B CN105484205 B CN 105484205B CN 201511026933 A CN201511026933 A CN 201511026933A CN 105484205 B CN105484205 B CN 105484205B
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- 238000010276 construction Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 25
- 238000007789 sealing Methods 0.000 title claims 24
- 238000009412 basement excavation Methods 0.000 claims abstract description 27
- PTVDYARBVCBHSL-UHFFFAOYSA-N copper;hydrate Chemical compound O.[Cu] PTVDYARBVCBHSL-UHFFFAOYSA-N 0.000 claims description 35
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 2
- 239000011435 rock Substances 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000015271 coagulation Effects 0.000 claims 1
- 238000005345 coagulation Methods 0.000 claims 1
- 230000002265 prevention Effects 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 abstract description 59
- 239000010949 copper Substances 0.000 abstract description 59
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 58
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005422 blasting Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
本发明公开了一种混凝土防渗面板重构坝踵盖板止水结构及其施工方法，该盖板止水结构在盖板与新混凝土防渗面板之间设置水平缝铜止水片，盖板内的第二竖向缝铜止水片与新混凝土防渗面板的第一竖向缝铜止水片衔接且伸入盖板底部设置的止水埂，使新混凝土防渗面板的止水系统与基岩实现嵌固衔接，确保坝踵部位结构的止水效果。本发明衔接上部新混凝土防渗面板及下部基岩灌浆帷幕，使大坝形成封闭的坝体与坝基防渗系统。本发明最大程度地适应了原坝基开挖线，大大减小基岩新增开挖工程量，克服现有技术基岩开挖量较大且基岩爆破开挖影响大坝安全等缺陷；满足了大坝基岩帷幕灌浆对盖板压重和施工平台宽度的需要。
The invention discloses a concrete anti-seepage panel reconstructed dam heel cover plate water-stop structure and a construction method thereof. The cover plate water-stop structure is provided with a horizontal seam copper water-stop sheet between the cover plate and the new concrete anti-seepage panel, and the cover The second vertical seam copper water-stop sheet in the panel is connected with the first vertical seam copper water-stop sheet of the new concrete anti-seepage panel and extends into the water-stop ridge set at the bottom of the cover plate, so that the water-stop of the new concrete anti-seepage panel The system is embedded and connected with the bedrock to ensure the water-stop effect of the structure at the dam heel. The invention connects the upper new concrete anti-seepage panel and the lower bedrock grouting curtain, so that the dam forms a closed dam body and dam foundation anti-seepage system. The present invention adapts to the original dam foundation excavation line to the greatest extent, greatly reduces the amount of newly added excavation of bedrock, and overcomes the defects in the prior art that the amount of bedrock excavation is large and bedrock blasting excavation affects the safety of the dam; The requirements of the dam bedrock curtain grouting for the weight of the cover plate and the width of the construction platform are met.
Description
技术领域technical field
本发明涉及水利工程技术领域，具体是指一种混凝土防渗面板重构坝踵盖板止水结构及其施工方法。The invention relates to the technical field of water conservancy engineering, in particular to a water-stop structure of a reconfigured dam heel cover plate with a concrete anti-seepage face plate and a construction method thereof.
背景技术Background technique
现有浆砌石重力坝的防渗体系主要由坝体防渗和坝基防渗帷幕所组成。坝体防渗主要依靠坝体混凝土自身的抗渗性能。但对于坝体本身防渗能力不足的浆砌石重力坝、混凝土坝等，通过在上游坝面上增设一定厚度的混凝土防渗面板，能够增强坝体抗渗性能，从而达到防渗目的。防渗帷幕是在基岩中建造的一道连续的、完整的、渗透性低的、平面上呈条带状、立面上形似幕墙的帷幕防渗结构。The anti-seepage system of the existing masonry gravity dam is mainly composed of the anti-seepage of the dam body and the anti-seepage curtain of the dam foundation. The anti-seepage of the dam mainly depends on the anti-seepage performance of the dam concrete itself. However, for masonry gravity dams and concrete dams with insufficient anti-seepage ability of the dam body itself, the anti-seepage performance of the dam body can be enhanced by adding a certain thickness of concrete anti-seepage face plate on the upstream dam surface, so as to achieve the purpose of anti-seepage. The anti-seepage curtain is a continuous, complete, low-permeability curtain anti-seepage structure built in the bedrock, in the shape of strips on the plane, and like a curtain wall on the facade.
当大坝上游原混凝土防渗面板渗漏严重时，需重新构建新混凝土防渗面板，而新混凝土防渗面板坐落在坝踵基岩上，一般需要对原坝踵处基岩进行开挖。目前采用的惯用手段是将原坝踵处基岩爆破扩挖，扩挖足够宽度后浇筑大于2m宽的混凝土盖板，利用混凝土盖板对坝基灌浆，并使得新混凝土防渗面板的止水系统与基岩嵌固衔接，与坝基上游侧灌浆防渗体结合。原坝踵处基岩爆破开挖这种施工方式，会容易导致坝踵开裂，一旦坝踵开裂，高压水渗入，可能产生劈裂作用，造成更严重的渗漏问题，危及大坝的安全。When the leakage of the original concrete anti-seepage panel upstream of the dam is serious, it is necessary to rebuild a new concrete anti-seepage panel, and the new concrete anti-seepage panel is located on the bedrock of the dam heel, and generally the bedrock at the original dam heel needs to be excavated. The usual method currently used is to blast and expand the bedrock at the heel of the original dam, and then pour a concrete cover slab with a width greater than 2m after the excavation is wide enough, use the concrete cover slab to grout the dam foundation, and make the water-stop system of the new concrete anti-seepage panel It is embedded and connected with the bedrock, and combined with the grouting anti-seepage body on the upstream side of the dam foundation. The construction method of blasting and excavating the bedrock at the original dam heel will easily lead to cracking of the dam heel. Once the dam heel is cracked, high-pressure water seeps in, which may cause splitting, causing more serious leakage problems and endangering the safety of the dam.
发明内容Contents of the invention
本发明的目的在于提供一种混凝土防渗面板重构坝踵盖板止水结构及其施工方法，该盖板止水结构衔接上部新混凝土防渗面板及下部基岩灌浆帷幕，使大坝形成封闭的坝体与坝基防渗系统。The object of the present invention is to provide a concrete anti-seepage face plate reconstructed dam heel cover plate water-stop structure and its construction method. The cover plate water-stop structure connects the upper new concrete anti-seepage face plate and the lower bedrock grouting curtain to form a dam Closed dam body and dam foundation anti-seepage system.
为实现上述目的，本发明采用以下技术方案：本发明混凝土防渗面板重构坝踵盖板止水结构，包括设置在坝基原开挖面与原坝踵之间的盖板，所述盖板底部分别设置有止水埂和基岩灌浆帷幕，所述止水埂靠近坝基原开挖面的一侧形成止水埂新开挖线；所述原坝踵的上游侧位于盖板上方设置有新混凝土防渗面板，所述新混凝土防渗面板内设有防渗面板竖向缝，所述防渗面板竖向缝内安装有第一竖向缝铜止水片；所述盖板内设置盖板竖向缝，所述盖板竖向缝内安装有第二竖向缝铜止水片，所述第二竖向缝铜止水片的一端伸入所述止水埂，所述第二竖向缝铜止水片的另一端与所述第一竖向缝铜止水片衔接；所述盖板与新混凝土防渗面板之间设置有水平缝铜止水片，所述水平缝铜止水片分别与第二竖向缝铜止水片、第一竖向缝铜止水片焊接。In order to achieve the above object, the present invention adopts the following technical solutions: the concrete anti-seepage panel of the present invention reconstructs the water-stopping structure of the dam heel cover plate, including a cover plate arranged between the original excavation surface of the dam foundation and the original dam heel, and the cover plate The bottom is respectively provided with a water-stop ridge and a bedrock grouting curtain, and the side of the water-stop ridge close to the original excavation surface of the dam foundation forms a new excavation line of the water-stop ridge; A new concrete anti-seepage panel, the new concrete anti-seepage panel is provided with a vertical seam of the anti-seepage panel, and a first vertical seam copper water-stop sheet is installed in the vertical seam of the anti-seepage panel; The vertical seam of the cover plate, the second vertical seam copper water stop piece is installed in the vertical seam of the cover plate, one end of the second vertical seam copper water stop piece extends into the water stop ridge, the first The other end of the two vertical seam copper waterstops is connected to the first vertical seam copper waterstop; a horizontal seam copper waterstop is arranged between the cover plate and the new concrete anti-seepage panel, and the horizontal seam The copper water-stop sheet is welded to the second vertical seam copper water-stop sheet and the first vertical seam copper water-stop sheet respectively.
优选地，所述止水埂的深度为40cm，顶部宽度为60cm。Preferably, the water-stop ridge has a depth of 40cm and a top width of 60cm.
进一步地，所述第二竖向缝铜止水片伸入所述止水埂的长度为30cm。第二竖向缝铜止水片伸入止水埂的长度为止水埂深度的四分之三，一方面可以确保第二竖向缝铜止水片牢牢嵌固在止水埂内，另一方面第二竖向缝铜止水片与止水埂底部之间留有一定距离，可以避免第二竖向缝铜止水片顶抵止水埂底部而导致其破损。Further, the length of the second vertical seam copper water-stop sheet protruding into the water-stop ridge is 30cm. The length of the second vertical seam copper water-stop piece extends into the water-stop ridge to three-quarters of the depth of the water-stop ridge. On the one hand, it can ensure that the second vertical seam copper water-stop piece is firmly embedded in the water-stop ridge, and on the other hand On the one hand, a certain distance is left between the second vertical copper seam water-stop sheet and the bottom of the water-stop ridge, which can prevent the second vertical-seam copper water-stop sheet from abutting against the bottom of the water-stop ridge and causing damage to it.
再进一步地，所述防渗面板竖向缝与盖板竖向缝形成通缝，所述盖板竖向缝的宽度为2cm。防渗面板竖向缝与盖板竖向缝形成通缝，这样新混凝土防渗面板和盖板的变形能够协调，可避免盖板开裂，确保盖板止水结构的止水效果。Still further, the vertical seam of the anti-seepage panel and the vertical seam of the cover plate form a through seam, and the width of the vertical seam of the cover plate is 2 cm. The vertical joints of the anti-seepage panel and the vertical joints of the cover plate form a joint, so that the deformation of the new concrete anti-seepage panel and the cover plate can be coordinated, which can avoid cracking of the cover plate and ensure the water-stop effect of the water-stop structure of the cover plate.
再进一步地，所述第一竖向缝铜止水片、第二竖向缝铜止水片及水平缝铜止水片的厚度均为1.0mm，所述第一竖向缝铜止水片、第二竖向缝铜止水片及水平缝铜止水片的止水鼻子的直立段高度为4.5cm，所述止水鼻子的宽度为3.5cm。这种铜止水片具有良好的止水效果。Furthermore, the thicknesses of the first vertical copper seam waterstop, the second vertical copper seam waterstop and the horizontal copper seam waterstop are all 1.0mm, and the first vertical copper seam waterstop , The height of the upright section of the water-stop nose of the second vertical copper water-stop sheet and the horizontal seam copper water-stop sheet is 4.5cm, and the width of the water-stop nose is 3.5cm. This copper water-stop sheet has a good water-stop effect.
再进一步地，：所述盖板利用坝基原开挖面浇筑而成，所述盖板的厚度为3.5m，顶部宽度为2m。这样盖板能够满足下部基岩灌浆帷幕的压浆盖重要求，同时满足顶部灌浆施工平台的宽度要求，便于基岩灌浆帷幕的钻孔和灌浆操作。Still further, the cover plate is poured using the original excavation surface of the dam foundation, the thickness of the cover plate is 3.5m, and the width of the top is 2m. In this way, the cover plate can meet the grouting cover weight requirements of the lower bedrock grouting curtain, and meet the width requirement of the top grouting construction platform at the same time, which is convenient for drilling and grouting operations of the bedrock grouting curtain.
本发明还提供一种上述混凝土防渗面板重构坝踵盖板止水结构的施工方法，包括以下步骤：The present invention also provides a construction method for reconstructing the water-stop structure of the dam heel cover plate with the above-mentioned concrete anti-seepage face plate, comprising the following steps:
1)在坝基原开挖面底部凿挖止水埂，形成新止水埂开挖线，其中止水埂的深度为40cm，顶部宽度为60cm；1) Excavate the water-stop ridge at the bottom of the original excavation surface of the dam foundation to form a new water-stop ridge excavation line, wherein the depth of the water-stop ridge is 40cm, and the top width is 60cm;
2)构建盖板竖向缝，使得盖板竖向缝与顶部新混凝土防渗面板的防渗面板竖向缝形成通缝，其中盖板竖向缝的宽度为2cm；2) Construct the vertical joint of the cover plate so that the vertical joint of the cover plate and the vertical joint of the anti-seepage panel of the new concrete anti-seepage panel on the top form a through joint, wherein the width of the vertical joint of the cover plate is 2cm;
3)在盖板竖向缝外围安装第二竖向缝铜止水片，使第二竖向缝铜止水片与顶部新混凝土防渗面板的第一竖向缝铜止水片衔接且伸入止水埂中，其中，第二竖向缝铜止水片伸入止水埂的长度为30cm；3) Install the second vertical copper water-stop sheet on the periphery of the vertical seam of the cover plate, so that the second vertical seam copper water-stop sheet is connected with the first vertical seam copper water-stop sheet of the new concrete anti-seepage panel on the top and extends Into the water-stop ridge, wherein, the length of the second vertical seam copper water-stop piece extending into the water-stop ridge is 30cm;
4)在第二竖向缝铜止水片与第一竖向缝铜止水片衔接处安装水平缝铜止水片，将水平缝铜止水片分别与第二竖向缝铜止水片及第一竖向缝铜止水片焊接；4) Install the horizontal copper water-stop at the connection between the second vertical copper water-stop and the first vertical copper water-stop, and connect the horizontal copper water-stop with the second vertical copper water-stop respectively And the first vertical seam copper water-stop welding;
5)在第二竖向缝铜止水片外围及止水埂上浇筑以形成盖板，最终得到盖板止水结构，其中盖板的厚度为3.5m，顶部宽度为2m；盖板止水结构衔接顶部新混凝土防渗面板及底部基岩灌浆帷幕以使大坝形成封闭的坝体与坝基防渗系统。5) Pouring on the periphery of the second vertical seam copper water-stop sheet and on the water-stop ridge to form a cover plate, and finally obtain a cover plate water-stop structure, wherein the thickness of the cover plate is 3.5m, and the width of the top is 2m; the cover plate water-stop The structure connects the new concrete anti-seepage panel at the top and the bedrock grouting curtain at the bottom so that the dam forms a closed dam body and dam foundation anti-seepage system.
在上述步骤5)中，盖板采用二级配的骨料搅拌混凝土进行浇筑，混凝土强度等级为C25。In the above step 5), the cover slab is poured with secondary aggregate mixed concrete, and the concrete strength grade is C25.
本发明的有益效果在于：The beneficial effects of the present invention are:
其一，本发明最大程度地适应了原坝基开挖线，大大减小基岩新增开挖工程量，克服现有技术基岩开挖量较大且基岩爆破开挖影响大坝安全等缺陷。First, the present invention adapts to the excavation line of the original dam foundation to the greatest extent, greatly reduces the amount of new excavation of the bedrock, overcomes the large amount of bedrock excavation in the prior art and the influence of bedrock blasting and excavation on the safety of the dam, etc. defect.
其二，本发明在盖板与新混凝土防渗面板之间设置水平缝铜止水片，盖板内的第二竖向缝铜止水片与新混凝土防渗面板的第一竖向缝铜止水片衔接且伸入盖板底部设置的止水埂，使新混凝土防渗面板的止水系统与基岩实现嵌固衔接，确保坝踵部位结构的止水效果。Its two, the present invention arranges the horizontal seam copper water-stop sheet between the cover plate and the new concrete anti-seepage panel, the second vertical seam copper water-stop sheet in the cover plate and the first vertical seam copper water-stop sheet of the new concrete anti-seepage panel The water-stop sheet is connected and extended into the water-stop ridge set at the bottom of the cover plate, so that the water-stop system of the new concrete anti-seepage panel is embedded and connected with the bedrock, ensuring the water-stop effect of the structure at the dam heel.
其三，本发明的新混凝土防渗面板底部坐落在盖板上，盖板的厚度为3.5m且其顶部留有2m宽的平台，满足基岩灌浆帷幕对压浆盖重和施工平台的要求。Its three, the bottom of the new concrete anti-seepage panel of the present invention is located on the cover plate, the thickness of the cover plate is 3.5m and a 2m wide platform is left on the top, which meets the requirements of the bedrock grouting curtain for the grouting cover weight and construction platform .
其四，本发明盖板止水结构衔接上部新混凝土防渗面板及下部基岩灌浆帷幕，使大坝形成封闭的坝体与坝基防渗系统。Fourth, the cover plate water-stop structure of the present invention connects the upper new concrete anti-seepage panel and the lower bedrock grouting curtain, so that the dam forms a closed dam body and dam foundation anti-seepage system.
附图说明Description of drawings
图1为一种混凝土防渗面板重构坝踵盖板止水结构的结构示意图；Fig. 1 is the structural representation of a kind of concrete anti-seepage panel reconstruction dam heel cover plate water-stop structure;
图2为图1中止水埂区域的放大示意图。Fig. 2 is an enlarged schematic view of the water-stop ridge area in Fig. 1 .
图中：坝基原开挖面1；止水埂新开挖线2；止水埂3；原坝踵4；新混凝土防渗面板5(其中：防渗面板竖向缝5.1，第一竖向缝铜止水片5.2)；盖板6(其中：盖板竖向缝6.1，第二竖向缝铜止水片6.2)；水平缝铜止水片7；基岩灌浆帷幕8；止水鼻子9。In the figure: the original excavation surface of the dam foundation 1; the new excavation line of the water stop ridge 2; the water stop ridge 3; the original dam heel 4; Copper seam waterstop 5.2); cover plate 6 (among them: cover plate vertical seam 6.1, second vertical seam copper waterstop 6.2); horizontal seam copper waterstop 7; bedrock grouting curtain 8; waterstop nose 9.
具体实施方式Detailed ways
以下结合附图和具体实施例对本发明作进一步的详细描述，但该实施例不应该理解为对本发明的限制。The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but these embodiments should not be construed as limiting the present invention.
如图1所示，本发明提供一种混凝土防渗面板重构坝踵盖板止水结构，包括设置在坝基原开挖面1与原坝踵4之间的盖板6。其中，盖板6的厚度为3.5m，顶部宽度为2m。盖板6底部分别设置有止水埂3和基岩灌浆帷幕8。其中，止水埂3的深度为40cm，顶部宽度为60cm，止水埂3靠近坝基原开挖面1的一侧壁形成止水埂新开挖线2。As shown in FIG. 1 , the present invention provides a water-stop structure of a reconstructed dam heel cover plate with concrete anti-seepage panels, including a cover plate 6 arranged between the original excavation surface 1 of the dam foundation and the original dam heel 4 . Wherein, the thickness of the cover plate 6 is 3.5m, and the top width is 2m. The bottom of the cover plate 6 is respectively provided with a water stop ridge 3 and a bedrock grouting curtain 8 . Wherein, the depth of the water-stop ridge 3 is 40 cm, and the top width is 60 cm. The side wall of the water-stop ridge 3 close to the original excavation surface 1 of the dam foundation forms a new excavation line 2 of the water-stop ridge.
原坝踵4的上游侧位于盖板6上方设置有新混凝土防渗面板5，新混凝土防渗面板5内设有防渗面板竖向缝5.1，防渗面板竖向缝5.1内安装有第一竖向缝铜止水片5.2。盖板6内设置盖板竖向缝6.1，其中，盖板竖向缝6.1与防渗面板竖向缝5.1形成通缝，盖板竖向缝6.1的宽度为2cm。盖板竖向缝6.1内安装有第二竖向缝铜止水片6.2，第二竖向缝铜止水片6.2的一端伸入止水埂3且伸入止水埂3内的长度为30cm，第二竖向缝铜止水片6.2的另一端与第一竖向缝铜止水片5.2衔接；盖板6与新混凝土防渗面板5之间设置有水平缝铜止水片7，水平缝铜止水片7分别与第二竖向缝铜止水片6.2、第一竖向缝铜止水片5.2焊接。其中，第一竖向缝铜止水片5.2、第二竖向缝铜止水片6.2及水平缝铜止水片7的厚度均为1.0mm，第一竖向缝铜止水片5.2、第二竖向缝铜止水片6.2及水平缝铜止水片7的止水鼻子9的直立段高度为4.5cm，止水鼻子9的宽度为3.5cm。The upstream side of the original dam heel 4 is located above the cover plate 6 and is provided with a new concrete anti-seepage panel 5. The new concrete anti-seepage panel 5 is provided with a vertical joint 5.1 of the anti-seepage panel, and the vertical joint 5.1 of the anti-seepage panel is installed with a first Vertical seam copper waterstop 5.2. The cover plate 6 is provided with a cover plate vertical seam 6.1, wherein the cover plate vertical seam 6.1 forms a joint with the anti-seepage panel vertical seam 5.1, and the width of the cover plate vertical seam 6.1 is 2cm. The second vertical seam copper water-stop sheet 6.2 is installed in the vertical seam 6.1 of the cover plate, and one end of the second vertical seam copper water-stop sheet 6.2 extends into the water-stop ridge 3 and the length extending into the water-stop ridge 3 is 30cm , the other end of the second vertical seam copper water-stop sheet 6.2 is connected with the first vertical seam copper water-stop sheet 5.2; a horizontal seam copper water-stop sheet 7 is arranged between the cover plate 6 and the new concrete anti-seepage panel 5, and the horizontal The copper seam waterstop 7 is welded to the second vertical copper seam waterstop 6.2 and the first vertical copper seam waterstop 5.2 respectively. Among them, the thickness of the first vertical copper water stop 5.2, the second vertical copper water stop 6.2 and the horizontal copper water stop 7 are all 1.0mm, the first vertical copper water stop 5.2, the second The upright segment height of the water-stop nose 9 of two vertical seam copper water-stop sheets 6.2 and the horizontal seam copper water-stop sheet 7 is 4.5cm, and the width of the water-stop nose 9 is 3.5cm.
本发明盖板止水结构衔接上部新混凝土防渗面板及下部基岩灌浆帷幕，使大坝形成封闭的坝体与坝基防渗系统。The water-stopping structure of the cover plate of the present invention connects the upper new concrete anti-seepage panel and the lower bedrock grouting curtain, so that the dam forms a closed dam body and dam foundation anti-seepage system.
本发明还提供上述混凝土防渗面板重构坝踵盖板止水结构的施工方法，包括以下步骤：The present invention also provides a construction method for reconstructing the water-stop structure of the dam heel cover plate with the above-mentioned concrete anti-seepage face plate, comprising the following steps:
1)在坝基原开挖面1底部凿挖止水埂3，形成新止水埂开挖线2，其中止水埂3的深度为40cm，顶部宽度为60cm；1) Excavate the water-stop ridge 3 at the bottom of the original excavation surface 1 of the dam foundation to form a new water-stop ridge excavation line 2, wherein the depth of the water-stop ridge 3 is 40cm, and the top width is 60cm;
2)构建盖板竖向缝6.1，使得盖板竖向缝6.1与顶部新混凝土防渗面板5的防渗面板竖向缝5.1形成通缝，其中盖板竖向缝6.1的宽度为2cm；2) Construct the vertical joint 6.1 of the cover plate so that the vertical joint 6.1 of the cover plate forms a through joint with the vertical joint 5.1 of the anti-seepage panel of the new concrete anti-seepage panel 5 on the top, wherein the width of the vertical joint 6.1 of the cover plate is 2cm;
3)在盖板竖向缝6.1内安装第二竖向缝铜止水片6.2，使第二竖向缝铜止水片6.2与顶部新混凝土防渗面板5的第一竖向缝铜止水片5.2衔接且伸入止水埂3中，其中，第二竖向缝铜止水片6.2伸入止水埂3的长度为30cm；3) Install the second vertical seam copper waterstop 6.2 in the vertical seam 6.1 of the cover plate, so that the second vertical seam copper waterstop 6.2 and the first vertical copper waterstop of the new concrete anti-seepage panel 5 on the top The pieces 5.2 are connected and extended into the water-stop ridge 3, wherein the length of the second vertical seam copper water-stop piece 6.2 extending into the water-stop ridge 3 is 30cm;
4)在第二竖向缝铜止水片6.2与第一竖向缝铜止水片5.2衔接处安装水平缝铜止水片7，将水平缝铜止水片7分别与第二竖向缝铜止水片6.2及第一竖向缝铜止水片5.2焊接；4) Install the horizontal seam copper waterstop 7 at the junction of the second vertical seam copper waterstop 6.2 and the first vertical seam copper waterstop 5.2, and connect the horizontal seam copper waterstop 7 to the second vertical seam respectively Copper water stop 6.2 and first vertical seam copper water stop 5.2 are welded;
5)在第二竖向缝铜止水片6.2外围及止水埂3上采用强度等级为C25、二级配的骨料搅拌混凝土进行浇筑以形成盖板6，最终得到盖板止水结构，其中，盖板6的厚度为3.5m，顶部宽度为2m。本发明盖板止水结构衔接顶部新混凝土防渗面板5及底部基岩灌浆帷幕8以使大坝形成封闭的坝体与坝基防渗系统。5) On the periphery of the second vertical seam copper water-stop sheet 6.2 and on the water-stop ridge 3, use aggregate mixing concrete with a strength grade of C25 and grade 2 to form the cover plate 6, and finally obtain the cover plate water-stop structure, Wherein, the thickness of the cover plate 6 is 3.5m, and the top width is 2m. The cover plate water-stop structure of the present invention connects the top new concrete anti-seepage panel 5 and the bottom bedrock grouting curtain 8 so that the dam forms a closed dam body and dam foundation anti-seepage system.
本说明书中未作详细描述的内容，属于本专业技术人员公知的现有技术。The content not described in detail in this specification belongs to the prior art known to those skilled in the art.
Claims (7)
- A kind of 1. concrete anti-seepage panel reconstruct dam heel cover plate water sealing structure, it is characterised in that：Including being arranged on, the dam foundation is former to be excavated Cover plate (6) between face (1) and former dam heel (4), cover plate (6) bottom are respectively arranged with the sealing ridge (3) and basement rock grouting curtain Curtain (8), the sealing ridge (3) form the new excavation line in the sealing ridge (2) close to the side of dam foundation original excavation face (1)；The former dam heel (4) upstream side, which is located above cover plate (6), is provided with novel concrete face slab for water retaining (5), in the novel concrete face slab for water retaining (5) Vertically stitched provided with face slab for water retaining (5.1), the face slab for water retaining, which vertically stitches, is provided with the first vertical seam copper water stop in (5.1) (5.2)；Cover plate is set vertically to stitch (6.1) in the cover plate (6), the cover plate, which vertically stitches, is provided with the second vertical seam in (6.1) The sealing ridge (3) is stretched into copper water stop (6.2), one end of the described second vertical seam copper water stop (6.2), and described second is vertical The other end of seam copper water stop (6.2) is connected with the described first vertical seam copper water stop (5.2)；The cover plate (6) and new coagulation Horizontal joint copper water stop (7) is provided between native face slab for water retaining (5), the horizontal joint copper water stop (7) is vertical with second respectively Stitch copper water stop (6.2), the first vertical seam copper water stop (5.2) welding；The cover plate (6) is poured using dam foundation original excavation face (1) Build and form, the thickness of the cover plate (6) is 3.5m, top width 2m；Described cover plate (6) is inverted trapezoidal.
- 2. heel cover plate water sealing structure in concrete anti-seepage panel reconstruct dam according to claim 1, it is characterised in that：It is described The depth on the sealing ridge (3) is 40cm, top width 60cm.
- 3. heel cover plate water sealing structure in concrete anti-seepage panel reconstruct dam according to claim 2, it is characterised in that：It is described The length that second vertical seam copper water stop (6.2) stretches into the sealing ridge (3) is 30cm.
- 4. heel cover plate water sealing structure in concrete anti-seepage panel reconstruct dam according to claim 1, it is characterised in that：It is described Face slab for water retaining vertically stitches (5.1) and vertically stitches (6.1) formation straight joint with cover plate, and the width that the cover plate vertically stitches (6.1) is 2cm.
- 5. heel cover plate water sealing structure in concrete anti-seepage panel reconstruct dam according to claim 1, it is characterised in that：Described Vertically the thickness of seam copper water stop (6.2) and horizontal joint copper water stop (7) is for one vertical seam copper water stop (5.2), second 1.0mm, the described first vertical seam copper water stop (5.2), the second vertical seam copper water stop (6.2) and horizontal joint copper water stop (7) The vertical section of sealing nose (9) be highly 4.5cm, the width of the sealing nose (9) is 3.5cm.
- A kind of 6. construction party of the concrete anti-seepage panel reconstruct dam heel cover plate water sealing structure any one of claim 1-5 Method, it is characterised in that comprise the following steps：1) dug in dam foundation original excavation face (1) bottom and dig the sealing ridge (3), form the new excavation line in the sealing ridge (2), wherein the sealing ridge (3) Depth be 40cm, top width 60cm；2) structure cover plate vertically stitches (6.1) so that cover plate vertically stitches the antiseepage of (6.1) and top novel concrete face slab for water retaining (5) Panel vertically stitches (5.1) and forms straight joint, and the width that its cover plate vertically stitches (6.1) is 2cm；3) the vertically seam copper water stop (6.2) of (6.1) periphery installation second is vertically stitched in cover plate, makes the second vertical seam copper water stop (6.2) copper water stop (5.2) is vertically stitched with the first of top novel concrete face slab for water retaining (5) to be connected and stretch into the sealing ridge (3), Wherein, the length that the second vertical seam copper water stop (6.2) stretches into the sealing ridge (3) is 30cm；4) stop in the second vertical seam copper water stop (6.2) and first vertical seam copper water stop (5.2) joining place installation horizontal joint copper Water piece (7), horizontal joint copper water stop (7) is vertically stitched into copper water stop with the second vertical seam copper water stop (6.2) and first respectively (5.2) weld；5) poured on the second vertical seam copper water stop (6.2) periphery and the sealing ridge (3) to form cover plate (6), finally give lid Plate water sealing structure, the thickness of its cover plate (6) is 3.5m, top width 2m；Cover plate water sealing structure linking top novel concrete Face slab for water retaining (5) and bottom basement rock grout curtain (8) are so that dam forms the dam body and seepage prevention of dam founda system of closing.
- 7. according to the construction method of the concrete anti-seepage panel reconstruct dam heel cover plate water sealing structure described in claim 6, it is special Sign is, in the step 5), cover plate (6) is poured using the aggregate ready-mixed concrete of graduation two, concrete strength etc. Level is C25.
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