CN103898891B - Vacuum preloading envelope wall and construction method thereof - Google Patents
Vacuum preloading envelope wall and construction method thereof Download PDFInfo
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Abstract
本发明公开了真空预压密封墙，采用水泥土搅拌桩形成密封墙体，所述桩由水灰比（重量比）为1.95的水泥混合浆液与原状土搅拌而成，其中水泥混合浆液包括水泥、膨润土和碳酸钠，所述水泥的掺入量是每根桩的原状土重量的5%，所述膨润土的掺入量是每根桩的原状土重量的0.8％，所述碳酸钠的掺入量是每根桩的原状土重量的0.04%，所述原状土的比重根据现场取土测定。本发明还公开了一种真空预压密封墙的施工方法。本发明提供的真空预压密封墙及其施工方法，采用上述配方制成的真空预压密封墙，既能保证墙体密封性不会开裂，又能提供一定强度满足一般地基承载力要求。
The invention discloses a vacuum preloaded sealing wall. A cement-soil mixing pile is used to form the sealing wall. The pile is formed by mixing cement mixed slurry with a water-cement ratio (weight ratio) of 1.95 and undisturbed soil, wherein the cement mixed slurry includes cement , bentonite and sodium carbonate, the admixture of the cement is 5% of the undisturbed soil weight of each pile, the admixture of the bentonite is 0.8% of the undisturbed soil weight of each pile, the admixture of the sodium carbonate The input amount is 0.04% of the undisturbed soil weight of each pile, and the specific gravity of the undisturbed soil is determined according to the soil sampling on site. The invention also discloses a construction method of the vacuum preloaded sealing wall. The vacuum preloaded sealing wall and its construction method provided by the present invention, the vacuum preloaded sealing wall made of the above formula, can not only ensure that the sealing property of the wall will not crack, but also provide a certain strength to meet the general foundation bearing capacity requirements.
Description
技术领域technical field
本发明涉及一种建筑施工技术领域，尤其涉及一种真空预压密封墙及其施工方法。The invention relates to the technical field of building construction, in particular to a vacuum preloaded sealing wall and a construction method thereof.
背景技术Background technique
目前，在建筑施工中，经常需要对地基进行真空预压处理。真空预压地基处理形成的竖向密封墙具有两点作用：At present, in building construction, it is often necessary to carry out vacuum preloading treatment on the foundation. The vertical sealing wall formed by vacuum preloading foundation treatment has two functions:
一是保证预压地块的气密性，以使抽真空过程中，加固区内的土体固结负压力保持在一定强度，保证预压效果；The first is to ensure the airtightness of the pre-compressed land, so that during the vacuuming process, the negative pressure of soil consolidation in the reinforcement area can be kept at a certain strength to ensure the effect of pre-compression;
二是隔断加固区内外土体的水联系，降低区块内的孔隙水压力，是实施真空预压的关键一环，其水密性的高低和施工质量的好坏至关重要。The second is to cut off the water connection between the soil inside and outside the reinforcement area and reduce the pore water pressure in the area, which is a key link in the implementation of vacuum preloading. The level of water tightness and construction quality are very important.
现有常规的密封墙一般采用水泥土搅拌桩或粘土搅拌桩这两种形式：The existing conventional sealing wall generally adopts two forms of cement-soil mixing pile or clay mixing pile:
其一，水泥土搅拌桩密封墙的气密性和水密性相对一般，且真空预压过程中由于深层土体位移变形易造成水泥搅拌桩墙体开裂，造成真空失效。First, the airtightness and watertightness of the sealing wall of the cement-soil mixing pile are relatively average, and the displacement and deformation of the deep soil during the vacuum preloading process can easily cause the wall of the cement mixing pile to crack, resulting in vacuum failure.
其二，粘土搅拌桩由于是柔性墙体，不会因土体变形引起开裂，密封性很好，但粘土墙本身的承载力很低，真空预压结束后，为使密封墙处的地基承载力与地块内的地基承载力基本一致）需在密封沟搅拌桩原位置采用水泥土搅拌桩进行二次搅拌，延长了施工工期且增加了施工成本。Second, because the clay mixing pile is a flexible wall, it will not cause cracks due to soil deformation, and the sealing performance is very good, but the bearing capacity of the clay wall itself is very low. After the vacuum preloading is completed, in order to make the foundation at the sealing wall The force is basically the same as the bearing capacity of the foundation in the plot) It is necessary to use cement-soil mixing piles in the original position of the sealing ditch mixing piles for secondary mixing, which prolongs the construction period and increases the construction cost.
因此，如何提供一种既能保证墙体密封性不会开裂，又能提供一定强度满足一般地基承载力要求的真空预压密封墙及其施工方法是本领域技术人员亟待解决的一个技术问题。Therefore, how to provide a vacuum preloaded sealing wall and its construction method that can not only ensure the sealing performance of the wall without cracking, but also provide a certain strength to meet the general foundation bearing capacity requirements is a technical problem to be solved urgently by those skilled in the art.
发明内容Contents of the invention
本发明的目的在于提供一种真空预压密封墙及其施工方法，既能保证墙体密封性不会开裂，又能提供一定强度满足一般地基承载力要求。The purpose of the present invention is to provide a vacuum preloaded sealing wall and its construction method, which can not only ensure the sealing performance of the wall without cracking, but also provide a certain strength to meet the general bearing capacity requirements of the foundation.
为了达到上述的目的，本发明采用如下技术方案：In order to achieve the above-mentioned purpose, the present invention adopts following technical scheme:
一种真空预压密封墙，采用水泥土搅拌桩形成真空预压密封墙的墙体，所述桩由水灰比为1.95的水泥混合浆液与原状土搅拌而成，其中水泥混合浆液包括水泥、膨润土和碳酸钠，所述水泥的掺入量是每根桩的原状土重量的5%，所述膨润土的掺入量是每根桩的原状土重量的0.8％，所述碳酸钠的掺入量是每根桩的原状土重量的0.04%，所述原状土的比重根据现场取土测定。A vacuum preloaded sealing wall, the wall of the vacuum preloaded sealing wall is formed by using cement-soil mixing piles, the piles are formed by mixing cement mixed slurry with a water-cement ratio of 1.95 and undisturbed soil, wherein the cement mixed slurry includes cement, Bentonite and sodium carbonate, the admixture of the cement is 5% of the undisturbed soil weight of each pile, the admixture of the bentonite is 0.8% of the undisturbed soil weight of each pile, the admixture of the sodium carbonate The amount is 0.04% of the weight of the undisturbed soil of each pile, and the specific gravity of the undisturbed soil is determined according to the soil taken from the site.
优选的，所述真空预压密封墙的顶部设置密封沟。Preferably, a sealing groove is provided on the top of the vacuum preloaded sealing wall.
优选的，所述密封沟的两侧上方形成1:1梯形坡。Preferably, a 1:1 trapezoidal slope is formed on both sides of the sealing groove.
优选的，所述密封沟的底部开设一凹槽。Preferably, a groove is opened at the bottom of the sealing groove.
优选的，所述凹槽的深度是250-350毫米。Preferably, the depth of the groove is 250-350 mm.
本发明还公开了一种真空预压密封墙的施工方法，包括The invention also discloses a construction method of a vacuum preloaded sealing wall, comprising
配置和搅拌水泥混合浆液，所述水泥混合浆液的水灰比为1.95，其中灰料包括水泥、膨润土和碳酸钠，所述水泥的掺入量是每根桩的体积与原状土的比重之积的5%，所述膨润土的掺入量是每根桩的体积与原状土的比重之积的0.8％，所述碳酸钠的掺入量是每根桩的体积与原状土的比重之积的0.04%，所述原状土的比重为1.8吨/立方米；Configure and stir the cement mixing slurry, the water-cement ratio of the cement mixing slurry is 1.95, wherein the ash material includes cement, bentonite and sodium carbonate, and the amount of cement added is the product of the volume of each pile and the specific gravity of the undisturbed soil 5%, the mixing amount of the bentonite is 0.8% of the product of the volume of each pile and the specific gravity of the undisturbed soil, and the mixing amount of the sodium carbonate is the product of the volume of each pile and the specific gravity of the undisturbed soil 0.04%, the proportion of the undisturbed soil is 1.8 tons/cubic meter;
通过机械作用力渗入到软地基中，利用水泥混合浆液的流动充分融入原状土中，使之充盈于原状土的空隙中，形成水泥土搅拌桩，多根水泥搅拌桩形成真空预压密封墙的墙体；It penetrates into the soft foundation through mechanical force, and fully integrates into the undisturbed soil by the flow of cement mixing slurry, so that it fills in the gaps of the undisturbed soil to form cement-soil mixing piles, and multiple cement mixing piles form a vacuum preloaded sealing wall. wall;
对密封墙的墙体的顶部进行密封沟处理，包括在地基处理完成后，排尽密封沟四周的水，挖除淤泥；在密封沟的底部进一步向下开挖一凹槽，并人工修1:1梯形坡形成密封沟；密封沟开挖后，采用合格土分层回填处理，并反复碾压至设计标高。The sealing ditch treatment is carried out on the top of the wall of the sealing wall, including draining the water around the sealing ditch and removing the silt after the foundation treatment is completed; further excavating a groove at the bottom of the sealing ditch, and manually repairing 1 :1 The trapezoidal slope forms a sealing ditch; after the sealing ditch is excavated, it shall be backfilled with qualified soil in layers and rolled repeatedly to the design elevation.
优选的，在上述的真空预压密封墙的施工方法中，所述膨润土在使用前浸泡24小时。Preferably, in the above-mentioned construction method of the vacuum preloaded sealing wall, the bentonite is soaked for 24 hours before use.
优选的，在上述的真空预压密封墙的施工方法中，所述凹槽的深度是250-350毫米。Preferably, in the above construction method of the vacuum preloaded sealing wall, the depth of the groove is 250-350 mm.
本发明提供的真空预压密封墙及其施工方法，采用上述配方制成的真空预压密封墙，既能保证墙体密封性不会开裂，又能提供一定强度满足一般地基承载力要求。The vacuum preloaded sealing wall and its construction method provided by the present invention, the vacuum preloaded sealing wall made of the above-mentioned formula can not only ensure that the sealing property of the wall will not crack, but also provide a certain strength to meet the general foundation bearing capacity requirements.
附图说明Description of drawings
本发明的真空预压密封墙及其施工方法由以下的实施例及附图给出。The vacuum preloaded sealing wall of the present invention and its construction method are given by the following examples and accompanying drawings.
图1为本发明的真空预压密封墙上方的密封沟开挖前的结构示意图。Fig. 1 is a structural schematic diagram of the sealing ditch above the vacuum preloaded sealing wall of the present invention before excavation.
图2为本发明的真空预压密封墙上方的密封沟回填后的结构示意图。Fig. 2 is a structural schematic diagram of the backfilled sealing groove above the vacuum preloaded sealing wall of the present invention.
图中，1-桩，2-梯形坡，3-凹槽。In the figure, 1-pile, 2-trapezoidal slope, 3-groove.
具体实施方式detailed description
下面将参照附图对本发明进行更详细的描述，其中表示了本发明的优选实施例，应该理解本领域技术人员可以修改在此描述的本发明而仍然实现本发明的有利效果。因此，下列描述应当被理解为对于本领域技术人员的广泛知道，而并不作为对本发明的限制。The invention will now be described in more detail with reference to the accompanying drawings, in which preferred embodiments of the invention are shown, it being understood that those skilled in the art may modify the invention described herein and still achieve the advantageous effects of the invention. Therefore, the following description should be understood as the broad knowledge of those skilled in the art, but not as a limitation of the present invention.
为了清楚，不描述实际实施例的全部特征。在下列描述中，不详细描述公知的功能和结构，因为它们会使本发明由于不必要的细节而混乱。应当认为在任何实际实施例的开发中，必须作出大量实施细节以实现开发者的特定目标，例如按照有关系统或有关商业的限制，由一个实施例改变为另一个实施例。另外，应当认为这种开发工作可能是复杂和耗费时间的，但是对于本领域技术人员来说仅仅是常规工作。In the interest of clarity, not all features of an actual implementation are described. In the following description, well-known functions and constructions are not described in detail since they would obscure the invention with unnecessary detail. It should be appreciated that in the development of any actual embodiment, numerous implementation details must be worked out to achieve the developer's specific goals, such as changing from one embodiment to another in accordance with system-related or business-related constraints. Additionally, it should be recognized that such a development effort might be complex and time consuming, but would nevertheless be merely a routine undertaking for those skilled in the art.
为使本发明的目的、特征更明显易懂，下面结合附图对本发明的具体实施方式作进一步的说明。需说明的是，附图均采用非常简化的形式且均使用非精准的比率，仅用以方便、明晰地辅助说明本发明实施例的目的。In order to make the purpose and features of the present invention more comprehensible, the specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use imprecise ratios, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.
本实施例提供的真空预压密封墙，采用水泥土搅拌桩1形成真空预压密封墙的墙体，如下表（表一）所示，所述桩1由水灰比为1.95（重量）的水泥混合浆液与原状土搅拌而成，其中水泥混合浆液包括水泥、膨润土和碳酸钠，所述水泥的掺入量是每根桩1的原状土重量的5%，所述膨润土的掺入量是每根桩1的原状土重量的0.8%，所述碳酸钠的掺入量是每根桩1的原状土重量的0.04%，所述原状土的比重根据现场取土测定。经内部多次实践，采用上述配方制成的真空预压密封墙，既能保证墙体密封性不会开裂，又能提供一定强度满足一般地基承载力要求。The vacuum preloaded sealing wall provided in this embodiment adopts the cement-soil mixing pile 1 to form the wall of the vacuum preloaded sealing wall, as shown in the following table (Table 1), the pile 1 is composed of a cement with a water-cement ratio of 1.95 (weight). The cement mixing slurry is mixed with the undisturbed soil, wherein the cement mixing slurry comprises cement, bentonite and sodium carbonate, and the admixture of the cement is 5% of the undisturbed soil weight of every pile 1, and the admixture of the bentonite is 0.8% of the undisturbed soil weight of every pile 1, the admixture of described sodium carbonate is 0.04% of the undisturbed soil weight of every pile 1, and the specific gravity of described undisturbed soil is measured according to on-the-spot soil sampling. After many times of internal practice, the vacuum preloaded sealing wall made of the above formula can not only ensure the sealing of the wall without cracking, but also provide a certain strength to meet the general bearing capacity requirements of the foundation.
表一Table I
优选的，在上述的真空预压密封墙中，所述真空预压密封墙的顶部设置密封沟，以保证真空预压密封墙的密封性。Preferably, in the above-mentioned vacuum preloaded sealing wall, a sealing groove is provided on the top of the vacuum preloaded sealing wall to ensure the sealing performance of the vacuum preloaded sealing wall.
优选的，在上述的真空预压密封墙中，所述密封沟的两侧上方形成1:1梯形坡2，采用上述形式的密封沟结构比较稳定，密封性好。Preferably, in the above-mentioned vacuum preloaded sealing wall, a 1:1 trapezoidal slope 2 is formed on both sides of the sealing ditch, and the structure of the sealing ditch adopting the above form is relatively stable and has good sealing performance.
优选的，在上述的真空预压密封墙中，所述密封沟的底部开设一凹槽3，使通过设置凹槽3可以使得密封沟嵌入于真空液压密封墙的墙体中，从而使得密封够和真空预压密封墙的连接更加紧密，密封性更加好。Preferably, in the above-mentioned vacuum preloaded sealing wall, a groove 3 is provided at the bottom of the sealing groove, so that the sealing groove can be embedded in the wall of the vacuum hydraulic sealing wall by setting the groove 3, so that the sealing is sufficient The connection with the vacuum preloaded sealing wall is tighter, and the sealing performance is better.
优选的，所述凹槽3的深度可以是250-350毫米，本实施例中，所述凹槽3的深度是300毫米。Preferably, the depth of the groove 3 may be 250-350 mm, and in this embodiment, the depth of the groove 3 is 300 mm.
本实施例还提供了一种真空预压密封墙的施工方法，包括：This embodiment also provides a construction method for a vacuum preloaded sealing wall, including:
配置和搅拌水泥混合浆液，如表一所示，所述水泥混合浆液的水灰比（重量比）为1.95，其中灰料包括水泥、膨润土和碳酸钠，所述水泥的掺入量是每根桩1的体积与原状土的比重之积的5％，所述膨润土的掺入量是每根桩1的体积与原状土的比重之积的0.8%，优选的，在上述的真空预压密封墙的施工方法中，所述膨润土在使用前浸泡24小时，所述碳酸钠的掺入量是每根桩1的体积与原状土的比重之积的0.04%，所述原状土的比重为1.8吨/立方米；Configuration and mixing cement slurry, as shown in Table 1, the water-cement ratio (weight ratio) of described cement slurry is 1.95, and wherein ash material comprises cement, bentonite and sodium carbonate, and the admixture amount of described cement is every 5% of the product of the volume of the pile 1 and the specific gravity of the undisturbed soil, the admixture of the bentonite is 0.8% of the product of the volume of each pile 1 and the specific gravity of the undisturbed soil, preferably, in the above-mentioned vacuum preloading seal In the construction method of the wall, the bentonite is soaked for 24 hours before use, and the mixing amount of the sodium carbonate is 0.04% of the product of the volume of each pile 1 and the specific gravity of the undisturbed soil, and the specific gravity of the undisturbed soil is 1.8 ton/cubic meter;
通过机械作用力渗入到软地基中，利用水泥混合浆液的流动充分融入原状土中，使之充盈于原状土的空隙中，以提高土体的密度和强度，形成水泥土搅拌桩1，多根水泥搅拌桩1形成真空预压密封墙的墙体。所述水泥搅拌桩1采用“三搅二喷”的施工工艺，采用两排双轴Φ700水泥土搅拌桩1，搅拌桩1直径700mm，搭接宽度200mm，桩长为10m。Infiltrate into the soft foundation through mechanical force, fully integrate into the undisturbed soil by the flow of cement mixed slurry, make it fill in the gaps of undisturbed soil, so as to increase the density and strength of the soil, and form cement-soil mixing pile 1, multiple The cement mixing pile 1 forms the wall body of the vacuum preloaded sealing wall. The cement mixing pile 1 adopts the construction technology of "three stirring and two spraying", and two rows of biaxial Φ700 cement-soil mixing piles 1 are used. The diameter of the mixing pile 1 is 700mm, the lap width is 200mm, and the pile length is 10m.
对密封墙的墙体的顶部进行密封沟处理，包括在地基处理完成后，排尽密封沟四周的水，挖除淤泥，如图1所示；在密封沟的底部进一步向下开挖一凹槽3，并人工修1∶1梯形坡2形成密封沟；密封沟开挖后，采用合格土分层回填处理，并反复碾压至设计标高，如图2所示。Carry out sealing ditch treatment on the top of the wall of the sealing wall, including draining the water around the sealing ditch and removing the silt after the foundation treatment is completed, as shown in Figure 1; further excavating a concave hole at the bottom of the sealing ditch Groove 3, and manually repair 1:1 trapezoidal slope 2 to form a sealing ditch; after the sealing ditch is excavated, use qualified soil to backfill in layers, and repeatedly roll to the design elevation, as shown in Figure 2.
优选的，所述凹槽3的深度可以是250-350毫米，本实施例中，所述凹槽3的深度是300毫米。Preferably, the depth of the groove 3 may be 250-350 mm, and in this embodiment, the depth of the groove 3 is 300 mm.
综上所述，本发明提供的真空预压密封墙及其施工方法，采用上述配方制成的真空预压密封墙，既能保证墙体密封性不会开裂，又能提供一定强度满足一般地基承载力要求。In summary, the vacuum preloaded sealing wall and its construction method provided by the present invention, the vacuum preloaded sealing wall made of the above formula can not only ensure that the wall will not crack, but also provide a certain strength to meet the general foundation requirements. carrying capacity requirements.
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention belong to the claims of the present invention and their equivalents
同技术的范围之内，则本发明也意图包含这些改动和变型在内。Within the scope of the same technology, the present invention also intends to cover these changes and modifications.
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| CN104234033A (en) * | 2014-08-15 | 2014-12-24 | 中国十七冶集团有限公司 | Vertical depth film single-rank-pile envelope wall |
| CN104876489A (en) * | 2015-05-15 | 2015-09-02 | 中铁十一局集团第四工程有限公司 | Cement-bentonite slurry preparation and preparation method thereof |
| CN104929106B (en) * | 2015-06-30 | 2017-06-30 | 中国二十冶集团有限公司 | A kind of water of vacuum heaping pre-compression wax wall supports structure |
| CN105464150B (en) * | 2015-12-21 | 2018-03-13 | 中交天津港湾工程研究院有限公司 | A kind of monitoring method of vacuum preloading envelope wall task performance |
| CN112575765A (en) * | 2020-12-17 | 2021-03-30 | 广西钢铁集团有限公司 | Method for treating sealed curtain wall by utilizing sludge construction vacuum preloading |
| CN113062296A (en) * | 2021-04-02 | 2021-07-02 | 交通运输部天津水运工程科学研究所 | A vacuum preloading boundary sealing method |
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| JP2006056909A (en) * | 2004-07-20 | 2006-03-02 | Kyokado Eng Co Ltd | Plastic grout and grouting technique |
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| JP4889051B2 (en) * | 2008-11-25 | 2012-02-29 | ライト工業株式会社 | How to build a continuous wall |
| CN102444137A (en) * | 2011-11-08 | 2012-05-09 | 中国建筑西南勘察设计研究院有限公司 | Construction method of vacuum pre-pressed slurry closed wall |
| CN102515642A (en) * | 2011-12-09 | 2012-06-27 | 中国建筑西南勘察设计研究院有限公司 | Formula of slurry with relatively high viscosity |
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| JP2006056909A (en) * | 2004-07-20 | 2006-03-02 | Kyokado Eng Co Ltd | Plastic grout and grouting technique |
| CN101200365A (en) * | 2007-12-28 | 2008-06-18 | 中基发展建设工程有限责任公司 | H-shaped flexible concrete ultra-thin cut-off wall and construction method thereof |
| JP4889051B2 (en) * | 2008-11-25 | 2012-02-29 | ライト工業株式会社 | How to build a continuous wall |
| CN102444137A (en) * | 2011-11-08 | 2012-05-09 | 中国建筑西南勘察设计研究院有限公司 | Construction method of vacuum pre-pressed slurry closed wall |
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