CN107227740A - The construction method that limestone cave cell wall is closed in construction of diaphragm wall - Google Patents
The construction method that limestone cave cell wall is closed in construction of diaphragm wall Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 18
- 235000019738 Limestone Nutrition 0.000 title claims abstract description 10
- 239000006028 limestone Substances 0.000 title claims abstract description 10
- 210000002421 cell wall Anatomy 0.000 title abstract 2
- 239000007788 liquid Substances 0.000 claims abstract description 72
- 239000004568 cement Substances 0.000 claims abstract description 18
- 230000000694 effects Effects 0.000 claims abstract description 10
- 239000011083 cement mortar Substances 0.000 claims abstract description 7
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 22
- 235000019994 cava Nutrition 0.000 claims description 15
- 238000007689 inspection Methods 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 230000035515 penetration Effects 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 239000003673 groundwater Substances 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 5
- 239000011440 grout Substances 0.000 abstract 5
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 239000008267 milk Substances 0.000 abstract 1
- 210000004080 milk Anatomy 0.000 abstract 1
- 235000013336 milk Nutrition 0.000 abstract 1
- 210000002966 serum Anatomy 0.000 abstract 1
- 125000006850 spacer group Chemical group 0.000 abstract 1
- 238000009412 basement excavation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
技术领域technical field
本发明涉及一种建筑工程技术领域的施工方法，具体涉及一种岩溶地层地下连续墙槽壁封闭的施工方法。The invention relates to a construction method in the technical field of construction engineering, in particular to a construction method for sealing the groove wall of an underground diaphragm wall in a karst formation.
背景技术Background technique
一般的地下连墙施工过程中前期多采用分段挖槽，然后在挖好的槽段内插入钢筋笼并灌注混凝土，在分段挖槽过程中，如遇石灰岩溶洞则要先对溶洞进行填充处理，目前公认较好的溶洞处理工艺方法是首先为探测溶洞（长*宽*高）位置，然后采取向溶洞内抛填块石、回填素混凝土、压力液浆等方法。这种溶洞处理方法需要布置很多地质探测孔探明溶洞具体大小，探测孔扰动溶洞多发生塌方安全隐患大，耗时过长，费用高、工期长、施工难度大、工效低，对深度较深的溶洞处理带来很大困难。In the general construction process of underground connecting walls, segmental excavation is often used in the early stage, and then steel cages are inserted into the excavated slots and concrete is poured. In the process of segmental excavation, if limestone caves are encountered, the caves must be filled first. At present, it is recognized that the better treatment method of karst caves is to first detect the position of karst caves (length*width*height), and then adopt methods such as throwing and filling blocks into the karst caves, backfilling plain concrete, and pressure slurry. This method of karst cave treatment needs to arrange many geological detection holes to find out the specific size of the karst caves. The detection holes disturb the karst caves and often cause landslides. It is very difficult to deal with the caves.
发明内容Contents of the invention
本发明的目的是提出一种地下连续墙施工中石灰岩溶洞槽壁封闭的施工方法，其只在连续墙位置局部进行槽壁封闭，具有施工方便、快捷、高效及节约成本的特点。The object of the present invention is to propose a construction method for sealing the groove wall of limestone karst cave in the construction of underground diaphragm wall, which only partially seals the groove wall at the position of the diaphragm wall, and has the characteristics of convenient, fast, efficient and cost-saving construction.
本发明的目的可通过如下技术方案来实现：The purpose of the present invention can be achieved through the following technical solutions:
一种地下连续墙施工中石灰岩溶洞槽壁封闭的施工方法，包括如下步骤。The invention discloses a construction method for sealing the groove wall of a limestone karst cave in the construction of an underground diaphragm wall, comprising the following steps.
步骤一，溶洞情况调查Step 1: Investigation of cave conditions
利用钻孔法在连续墙轴线和外围打设勘察孔，确定石灰岩溶洞的分布位置与大小，判断溶洞所处的地下水环境及富水性。Use the drilling method to drill survey holes on the axis and periphery of the diaphragm wall to determine the distribution position and size of the limestone caves, and judge the groundwater environment and water-richness of the caves.
步骤二，打设灌浆孔Step 2: Drill the grouting holes
在近连续墙位置两侧以2～3m为间隔打设单液灌浆孔，若干单液灌浆孔围成单液灌浆圈；单液灌浆圈外侧以2～3m为间隔打设双液灌浆孔，若干双液灌浆孔围成双液灌浆圈；双液灌浆圈与单液灌浆圈相隔2～2.5m。Set single-liquid grouting holes at intervals of 2-3m on both sides of the near continuous wall, and several single-liquid grouting holes form a single-liquid grouting circle; set double-liquid grouting holes at intervals of 2-3m outside the single-liquid grouting circle, A number of double-liquid grouting holes are surrounded to form a double-liquid grouting circle; the distance between the double-liquid grouting circle and the single-liquid grouting circle is 2-2.5m.
步骤三，往溶洞内灌注双液注浆Step 3: Pour double-liquid grouting into the cave
往双液灌浆圈的双液灌浆孔插入注浆管，注浆管位于溶洞段具有分布注浆孔，注浆管端用堵塞封堵，注浆孔用胶布临时封堵；Insert the grouting pipe into the double-liquid grouting hole of the double-liquid grouting ring. The grouting pipe is located in the cave section and has distributed grouting holes. The end of the grouting pipe is blocked with a plug, and the grouting hole is temporarily blocked with adhesive tape;
用注浆泵通过注浆管往溶洞灌注双液注浆，所述双液注浆是水泥：水：水玻璃以10: 10～15: 2～4的质量比混合浆液，水泥采用42.5级硅酸盐水泥或普通硅酸盐水泥，水玻璃模数m=2.4～3.2（浓度Be=30～40），注浆速度为：30～70L/min。Use a grouting pump to pour double-liquid grouting into the cave through the grouting pipe. The double-liquid grouting is cement: water: water glass with a mass ratio of 10: 10-15: 2-4. The cement uses 42.5 grade silicon Salt cement or ordinary Portland cement, water glass modulus m=2.4~3.2 (concentration Be=30~40), grouting speed: 30~70L/min.
注浆方式采用跳注法，即先注奇数孔，再注偶数孔，双液浆注浆完成后会形成一道幕墙，在溶洞内围蔽出连续幕墙区，注浆完成后，拔出注浆管，用M7.5号水泥砂浆封堵双液灌浆孔。The grouting method adopts the jump injection method, that is, the odd-numbered holes are injected first, and then the even-numbered holes are injected. After the double-liquid grouting is completed, a curtain wall will be formed, and a continuous curtain wall area will be enclosed in the cave. After the grouting is completed, pull out the grouting Pipe, use M7.5 cement mortar to seal the double-liquid grouting hole.
步骤四，往溶洞内灌注单液注浆Step 4, pour single-liquid grouting into the cave
往单液灌浆圈的单液灌浆孔插入注浆管，注浆管位于溶洞段具有分布注浆孔，注浆管端用堵塞封堵，注浆孔用胶布临时封堵；Insert the grouting pipe into the single-liquid grouting hole of the single-liquid grouting ring. The grouting pipe is located in the cave section and has distributed grouting holes. The end of the grouting pipe is blocked with a plug, and the grouting hole is temporarily blocked with adhesive tape;
用注浆泵通过注浆管往溶洞灌注单液注浆，所述单液注浆即是水泥浆，水泥采用42.5级硅酸盐水泥或普通硅酸盐水泥，水灰比=1.0～1.5，注浆速度为：30～70L/min。Use a grouting pump to pour single-liquid grouting into the cave through the grouting pipe. The single-liquid grouting is cement slurry. The cement is 42.5 grade Portland cement or ordinary Portland cement, and the water-cement ratio is 1.0-1.5. The grouting speed is: 30~70L/min.
注浆方式采用跳注法，即先注奇数孔，再注偶数孔，单液浆注浆完成后在连续墙区形成连续墙可挖区，注浆完成后，拔出注浆管，用M7.5号水泥砂浆封堵单液灌浆孔。The grouting method adopts the jump injection method, that is, the odd-numbered holes are injected first, and then the even-numbered holes are injected. After the single-liquid grouting is completed, the diaphragm wall can be excavated in the diaphragm wall area. After the grouting is completed, pull out the grouting pipe and use M7 .5 cement mortar to seal the single liquid grouting hole.
步骤五，注桨效果检测Step 5, check the effect of paddle injection
按钻孔数的5%设检测钻孔，1个检测钻孔应不少于3个标贯检测点，通过检测钻孔对溶洞注桨效果进行标贯检测，标贯击数按8击<100mm为合格。According to 5% of the number of drilled holes, set the inspection drill holes. One inspection drill hole should have no less than 3 standard penetration inspection points. Through the inspection drill holes, the standard penetration inspection of the grouting effect in the karst cave is carried out. The number of standard penetration strokes is 8 strokes< 100mm is qualified.
与现有技术相比，本发明具有如下突出的实质性效果和显著的进步：Compared with the prior art, the present invention has the following prominent substantive effects and remarkable progress:
1. 本发明针对位置较深的溶洞，只需要在连续墙外围打设勘察孔，而不需要探测整个溶洞的具体尺寸，不因布置过多探测孔而引起塌方的安全隐患。1. For deep karst caves, the present invention only needs to drill survey holes on the periphery of the diaphragm wall, without detecting the specific size of the entire karst cave, and does not cause potential safety hazards of landslides due to the arrangement of too many detection holes.
2. 本发明只需要在连续墙位置适当扩大范围灌浆，而不需要对整个溶洞作抽空及灌浆填充处理，具有工期短、难度小、成本低、效果好等特点。2. The present invention only needs to appropriately expand the scope of grouting at the position of the diaphragm wall, and does not need to evacuate and fill the entire cave with grouting. It has the characteristics of short construction period, low difficulty, low cost, and good effect.
附图说明Description of drawings
图1 溶洞探测孔和注浆孔平面布置示意图。Fig. 1 Schematic diagram of the plane layout of detection holes and grouting holes in the cave.
具体实施方式detailed description
下面用具体实施例对本发明作进一步说明：The present invention will be further described below with specific embodiment:
参考图1，一种地下连续墙施工中石灰岩溶洞槽壁封闭的施工方法，包括如下步骤。With reference to Fig. 1, a kind of construction method of limestone karst cave groove wall closure in the construction of underground diaphragm wall, comprises the following steps.
步骤一，溶洞情况调查Step 1: Investigation of cave conditions
利用钻孔法在连续墙10的轴线和外围打设勘察孔1，确定石灰岩溶洞的分布位置与大小，判断溶洞所处的地下水环境及富水性。Drill survey holes 1 on the axis and periphery of the diaphragm wall 10 by using the drilling method to determine the distribution position and size of the limestone karst caves, and judge the groundwater environment and water-richness of the karst caves.
步骤二，打设灌浆孔Step 2: Drill the grouting holes
在近连续墙10位置两侧以2m为间隔打设单液灌浆孔2，若干单液灌浆孔2围成单液灌浆圈；单液灌浆圈外侧以2m为间隔打设双液灌浆孔3，若干双液灌浆孔3围成双液灌浆圈；双液灌浆圈与单液灌浆圈相隔2m，如图1所示。On both sides of the near continuous wall 10, single-liquid grouting holes 2 are drilled at intervals of 2m, and several single-liquid grouting holes 2 form a single-liquid grouting circle; the outer side of the single-liquid grouting circle is drilled with double-liquid grouting holes 3 at intervals of 2m. A number of double-liquid grouting holes 3 are surrounded to form a double-liquid grouting circle; the double-liquid grouting circle is separated from the single-liquid grouting circle by 2m, as shown in Figure 1.
步骤三，往溶洞内灌注双液注浆Step 3: Pour double-liquid grouting into the cave
往双液灌浆圈的双液灌浆孔3插入注浆管，注浆管位于溶洞段具有分布注浆孔，注浆管端用堵塞封堵，注浆孔用胶布临时封堵。Insert the grouting pipe into the double-liquid grouting hole 3 of the double-liquid grouting circle. The grouting pipe is located in the cave section and has distributed grouting holes. The end of the grouting pipe is blocked with a plug, and the grouting hole is temporarily blocked with adhesive tape.
用注浆泵通过注浆管往溶洞灌注双液注浆，所述双液注浆是水泥：水：水玻璃以10: 14: 3的质量比混合浆液，水泥采用42.5级普通硅酸盐水泥，水玻璃模数m=2.4～3.2（浓度Be=30～40），注浆速度为：30～70L/min。 Use a grouting pump to pour double-liquid grouting into the cave through the grouting pipe. The double-liquid grouting is cement: water: water glass mixed with a mass ratio of 10: 14: 3. The cement uses 42.5 grade ordinary Portland cement , water glass modulus m=2.4~3.2 (concentration Be=30~40), grouting speed: 30~70L/min.
注浆压力控制在0.2～0.5MPa，每个孔注浆时间根据压力大小决定，如果注浆压力一直达不到0.3MPa，则每个孔每次注浆量不得超过30m3，注浆未达到0.3MPa要求间隔24h后继续注浆，如此反复直至注浆达到终孔条件为止。如果注浆压力达到0.3MPa并有上升趋势，则继续注浆，当注浆压力达到0.5MPa的注浆终压时，继续注浆10min以上，则可终孔。The grouting pressure is controlled at 0.2-0.5MPa, and the grouting time for each hole is determined according to the pressure. If the grouting pressure does not reach 0.3MPa, the amount of grouting for each hole shall not exceed 30m 3 . 0.3MPa requires continuous grouting after an interval of 24 hours, and so on until the grouting reaches the final hole condition. If the grouting pressure reaches 0.3MPa and has an upward trend, continue grouting. When the grouting pressure reaches the final grouting pressure of 0.5MPa, continue grouting for more than 10 minutes, and the hole can be finalized.
注浆方式采用跳注法，即先注奇数孔，再注偶数孔，只有在每一组注浆完成后才进行下一组的注浆作业，双液浆注浆完成后会形成一道幕墙，在溶洞内围蔽出连续幕墙区，注浆完成后，拔出注浆管，用M7.5号水泥砂浆封堵双液灌浆孔3。The grouting method adopts the jump injection method, that is, the odd-numbered holes are injected first, and then the even-numbered holes are injected. Only after each group of grouting is completed, the next group of grouting operations will be carried out. After the double-liquid grouting is completed, a curtain wall will be formed. Enclose the continuous curtain wall area in the cave. After the grouting is completed, pull out the grouting pipe, and seal the double-liquid grouting hole 3 with M7.5 cement mortar.
步骤四，往溶洞内灌注单液注浆Step 4, pour single-liquid grouting into the cave
往单液灌浆圈的单液灌浆孔2插入注浆管，注浆管位于溶洞段具有分布注浆孔，注浆管端用堵塞封堵，注浆孔用胶布临时封堵。Insert the grouting pipe into the single-liquid grouting hole 2 of the single-liquid grouting ring. The grouting pipe is located in the cave section and has distributed grouting holes. The end of the grouting pipe is blocked with a plug, and the grouting hole is temporarily blocked with adhesive tape.
用注浆泵通过注浆管往溶洞灌注单液注浆，所述单液注浆即是水泥浆，水泥采用42.5级普通硅酸盐水泥，水灰比=1.0～1.5，注浆速度为：30～70L/min：Use a grouting pump to pour single-liquid grouting into the cave through the grouting pipe. The single-liquid grouting is the cement slurry. The cement is made of 42.5 grade ordinary Portland cement, the water-cement ratio=1.0-1.5, and the grouting speed is: 30～70L/min:
注浆压力控制方法同步骤三灌注双液注浆。The grouting pressure control method is the same as that of step three for double-fluid grouting.
注浆方式采用跳注法，即先注奇数孔，再注偶数孔，在每一组注浆完成后再进行下一组的注浆作业，单液浆注浆完成后在连续墙区形成连续墙可挖区，注浆完成后，拔出注浆管，用M7.5号水泥砂浆封堵单液灌浆孔。The grouting method adopts the jump injection method, that is, the odd-numbered holes are injected first, and then the even-numbered holes are injected. After each group of grouting is completed, the next group of grouting operations is performed. After the single-liquid grouting is completed, a continuous wall is formed in the continuous wall area. In the excavable area of the wall, after the grouting is completed, pull out the grouting pipe, and seal the single-liquid grouting hole with M7.5 cement mortar.
步骤五，注桨效果检测Step 5, check the effect of paddle injection
按钻孔数的5%设检测钻孔，1个检测钻孔应不少于3个标贯检测点，通过检测钻孔对溶洞注桨效果进行标贯检测，标贯击数按8击<100mm为合格。According to 5% of the number of drilled holes, set the inspection drill holes. One inspection drill hole should have no less than 3 standard penetration inspection points. Through the inspection drill holes, the standard penetration inspection of the grouting effect in the karst cave is carried out. The number of standard penetration strokes is 8 strokes< 100mm is qualified.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107938649A (en) * | 2017-11-29 | 2018-04-20 | 上海建工五建集团有限公司 | A kind of solution cavity foundation reinforcement method |
| CN112664193A (en) * | 2021-01-12 | 2021-04-16 | 北京天地华泰矿业管理股份有限公司 | Coal mining method under high-voltage transmission line |
| WO2021248872A1 (en) * | 2020-06-11 | 2021-12-16 | 中铁一局集团第二工程有限公司 | Method for determining safe thickness of side wall in karst area of foundation pit, and grouting device |
| CN115419047A (en) * | 2022-09-13 | 2022-12-02 | 中铁二十局集团南方工程有限公司 | Karst cave grouting process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112664193A (en) * | 2021-01-12 | 2021-04-16 | 北京天地华泰矿业管理股份有限公司 | Coal mining method under high-voltage transmission line |
| CN115419047A (en) * | 2022-09-13 | 2022-12-02 | 中铁二十局集团南方工程有限公司 | Karst cave grouting process |
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