CN114855813A - A kind of supporting device and construction method for stagnant water dewatering slope surface of upper layer of foundation pit - Google Patents

A kind of supporting device and construction method for stagnant water dewatering slope surface of upper layer of foundation pit Download PDF

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CN114855813A
CN114855813A CN202210440020.5A CN202210440020A CN114855813A CN 114855813 A CN114855813 A CN 114855813A CN 202210440020 A CN202210440020 A CN 202210440020A CN 114855813 A CN114855813 A CN 114855813A
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foundation pit
pipe
water
upper layer
water collecting
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CN114855813B (en
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王旭影
赵建业
邢运涛
杨文�
冯朋
李志勇
李岩松
李跃
康惠珍
杨万顺
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Fifth Geological Brigade Of Hebei Bureau Of Geology And Mineral Exploration And Development Hebei Marine Geological Environment Investigation Center
Tangshan University
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Tangshan University
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D36/00Filter circuits or combinations of filters with other separating devices
    • B01D36/02Combinations of filters of different kinds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D36/00Filter circuits or combinations of filters with other separating devices
    • B01D36/04Combinations of filters with settling tanks
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/60Planning or developing urban green infrastructure

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  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)

Abstract

本发明涉及岩土基坑工程技术领域,尤其涉及一种基坑上层滞水降水坡面支护装置及施工方法。包括:预制模块,所述预制模块呈矩形并在后面设有连接筋;所述连接筋包括多根等距横向布置的横杆,以及沿横杆等距垂直布置的多根竖杆,所述横杆和竖杆的两端均弯曲为弧形状,所述预制模块上设有多个排水孔,且两侧设有多个通孔;排水部件,所述排水部件包括动力部分、连接管和集水管;提供了一种基坑上层滞水降水坡面支护装置及施工方法,通过预制模块配合连接筋固定在滞水层处,有效避免了支护结构坍塌的情况,并且集水管沿支护倾斜布置,并采用不同长度分别布置,减少降水成本。

Figure 202210440020

The invention relates to the technical field of geotechnical foundation pit engineering, in particular to a support device and a construction method for the slope surface of the upper layer of the foundation pit with stagnant water and dewatering. It includes: a prefabricated module, the prefabricated module is rectangular and is provided with a connecting rib at the back; the connecting rib includes a plurality of horizontal bars arranged at equal intervals, and a plurality of vertical bars arranged vertically at an equal distance along the horizontal bars, the Both ends of the horizontal bar and the vertical bar are bent into arc shapes, the prefabricated module is provided with a plurality of drainage holes, and both sides are provided with a plurality of through holes; the drainage component includes a power part, a connecting pipe and a A water collecting pipe; a supporting device and a construction method for the stagnant dewatering slope surface of the upper layer of the foundation pit are provided. The prefabricated modules are combined with the connecting ribs to be fixed at the water stagnant layer, which effectively avoids the collapse of the supporting structure, and the water collecting pipe is along the supporting structure. The guards are inclined and arranged in different lengths to reduce the cost of precipitation.

Figure 202210440020

Description

一种基坑上层滞水降水坡面支护装置及施工方法A kind of supporting device and construction method for stagnant water dewatering slope surface of upper layer of foundation pit

技术领域technical field

本发明涉及岩土基坑工程技术领域,尤其涉及一种基坑上层滞水降水坡面支护装置及施工方法。The invention relates to the technical field of geotechnical foundation pit engineering, in particular to a supporting device and a construction method for the slope surface of the upper layer of the foundation pit with stagnant water and dewatering.

背景技术Background technique

随着我国经济建设的快速发展和城市化水平的不断提高,高层建筑的逐渐增多,城市地下空间得到大规模的开发和利用,伴随越来越多的地下工程建设,基坑开挖支护降水是建设中的重要过程,通常必须通过基坑降水减少地下水对基坑的开挖过程中的影响;基坑开挖过程中,常有存在上层滞水的情况,在滞水区域喷射混凝土形成坡面支护时,由于水泥成型速度较慢,往往存在坍塌的风险,同时现有的排水系统通常为竖直布置管井降水,并且在降水中无法根据实际降水需求,调整井点管的工作数量,从而引起降水成本增加,并且传统的施工工艺复杂,无法满足施工需求。With the rapid development of my country's economic construction and the continuous improvement of the level of urbanization, the number of high-rise buildings has gradually increased, and the urban underground space has been developed and utilized on a large scale. It is an important process in construction. Usually, the impact of groundwater on the excavation process of the foundation pit must be reduced by dewatering the foundation pit. During the excavation process of the foundation pit, there is often stagnant water in the upper layer, and the shotcrete in the stagnant area forms a slope In the case of surface support, due to the slow cement forming speed, there is often a risk of collapse. At the same time, the existing drainage system is usually a vertical arrangement of pipe wells for dewatering, and the number of well-point pipes cannot be adjusted according to the actual dewatering demand during dewatering. As a result, the cost of precipitation increases, and the traditional construction process is complicated and cannot meet the construction needs.

发明内容SUMMARY OF THE INVENTION

本发明所要解决的技术问题,是针对上述存在的技术不足,提供了一种基坑上层滞水降水坡面支护装置及施工方法,通过预制模块配合连接筋固定在滞水层处,有效避免了支护结构坍塌的情况,并且集水管沿支护倾斜布置,并采用不同长度分别布置,减少降水成本。The technical problem to be solved by the present invention is aimed at the above-mentioned technical deficiencies, and provides a support device and a construction method for the upper layer of the foundation pit with stagnant water and dewatering slope. The collapse of the support structure is avoided, and the water collection pipes are arranged inclined along the support, and are arranged with different lengths to reduce the cost of precipitation.

为解决上述技术问题,本发明所采用的技术方案是:For solving the above-mentioned technical problems, the technical scheme adopted in the present invention is:

一种基坑上层滞水降水坡面支护装置,包括:A support device for the stagnant water and dewatering slope surface of the upper layer of a foundation pit, comprising:

预制模块,所述预制模块呈矩形并在后面设有连接筋;a prefabricated module, the prefabricated module is rectangular and is provided with connecting ribs at the back;

所述连接筋包括多根等距横向布置的横杆,以及沿横杆等距垂直布置的多根竖杆,所述横杆和竖杆的两端均弯曲为弧形状,所述预制模块上设有多个排水孔,且两侧设有多个通孔;The connecting rib includes a plurality of horizontally arranged horizontal bars at equal distances, and a plurality of vertical bars vertically arranged at equal distances along the horizontal bars. Both ends of the horizontal bars and vertical bars are bent into arc shapes. There are multiple drainage holes and multiple through holes on both sides;

排水部件,所述排水部件包括动力部分、连接管和集水管;多个所述集水管通过连接管与动力部分连接,多个所述集水管沿坡面支护长度方向并与水平面呈固定角度倾斜布置,且相邻两个集水管的长度不同。Drainage component, the drainage component includes a power part, a connecting pipe and a water collecting pipe; a plurality of the water collecting pipes are connected with the power part through the connecting pipe, and the plurality of the water collecting pipes are along the length direction of the slope support and at a fixed angle with the horizontal plane It is inclined and arranged, and the lengths of two adjacent water collecting pipes are different.

优选的,所述动力部分包括依次连接的真空泵、集水沉淀池和外接排水总管,所述真空泵与连接管连接。Preferably, the power part comprises a vacuum pump, a water collecting sedimentation tank and an external drainage main pipe connected in sequence, and the vacuum pump is connected with the connecting pipe.

优选的,所述集水管包括主管道和滤管;所述主管道与滤管连接;所述滤管上设有多个梅花形的进孔。Preferably, the water collecting pipe includes a main pipe and a filter pipe; the main pipe is connected with the filter pipe; the filter pipe is provided with a plurality of plum-shaped inlet holes.

优选的,所述滤管部分由内至外依次套设有螺旋形的塑料管、细滤网、支撑架、粗滤网和外部防护网。Preferably, the filter tube part is sequentially sheathed with a spiral plastic tube, a fine filter screen, a support frame, a coarse filter screen and an external protective screen from the inside to the outside.

优选的,所述塑料管上设有多个缺口。Preferably, the plastic tube is provided with a plurality of notches.

优选的,相邻两个所述的集水管长度分别为2.5米和5米,且两者之间的间距为1米。Preferably, the lengths of two adjacent water collecting pipes are respectively 2.5 meters and 5 meters, and the distance between them is 1 meter.

优选的,所述竖杆两端超出预制模块高度部分,且超出部分长度为250mm。Preferably, both ends of the vertical rod exceed the height of the prefabricated module, and the length of the exceeding part is 250 mm.

一种基坑上层滞水降水坡面支护装置的施工方法,包括如下步骤:A construction method of a stagnant water dewatering slope support device on the upper layer of a foundation pit, comprising the following steps:

步骤一:查明基坑地区地质情况,参照地质资料,大间距布孔再局部加密钻探获取对应参数并留置水文观测孔;Step 1: Find out the geological conditions of the foundation pit area, refer to the geological data, arrange the holes with large spacing and then local infill drilling to obtain the corresponding parameters and leave the hydrological observation holes;

步骤二:根据坡面横向跨度以及对应参数确定井点孔位,并沿坡面由上层滞水层顶部长度方向依次开设深度和水平面夹角不同的孔位,形成多点位排水区域;Step 2: According to the lateral span of the slope surface and the corresponding parameters, determine the well point hole position, and along the slope surface from the top of the upper aquifer layer along the length direction of the upper aquifer layer, open hole positions with different depths and horizontal plane angles in sequence to form a multi-point drainage area;

步骤三:根据对应孔位深度沉入对应长度的集水管,向孔位回填粗砂滤料,并在深度0.2—0.5米用黏土封口;Step 3: According to the depth of the corresponding hole, sink into the corresponding length of the water collection pipe, backfill the coarse sand filter material to the hole, and seal it with clay at a depth of 0.2-0.5 meters;

步骤四:将连接管与集水管连通,并通过动力部分进行抽取降水;Step 4: Connect the connecting pipe to the water collecting pipe, and extract precipitation through the power part;

步骤五:降水后,将预制模块依次铺设在预留的上层滞水层区域内,并通过竖杆与上、下处预先成型的坡面支护结构连接;Step 5: After precipitation, lay the prefabricated modules in sequence in the reserved upper water retention layer area, and connect them with the pre-formed slope support structures at the upper and lower positions through vertical rods;

步骤六:通过施工机械继续向下开挖基坑并喷射下部的混凝土支护与预制模块下部连接成型。Step 6: Continue to excavate the foundation pit downward through construction machinery and spray the lower concrete support to connect with the lower part of the prefabricated module.

优选的,所述步骤三中在沉入集水管前,沿集水管分段绑定多个三角形支架滑入孔位对集水管支撑。Preferably, in the third step, before sinking into the water collecting pipe, a plurality of triangular brackets are bound in sections along the water collecting pipe and slide into the holes to support the water collecting pipe.

与现有技术相比,本发明具有以下优点:1、通过通孔将预制模块与连接筋固定,并利用连接筋与预设的坡面支护结构连接,有效避免传统喷射混凝土成型慢,在滞水层处引起整体结构坍塌;2、通过集水管与水平面呈不同夹角深入上层滞水层,并配合不同的管长,将整体划分为多个抽水区域,可以调整降水的模式,从而有针对性的区域降水,不仅提高降水速度而且节省降水成本;3、通过施工方法对预制模块与基坑支护有效结合,并对集水管合理布置,从而达到预期的降水效果,顺利完成坡面支护工作。Compared with the prior art, the present invention has the following advantages: 1. Fix the prefabricated module and the connecting rib through the through hole, and use the connecting rib to connect with the preset slope support structure, which effectively avoids the slow molding of traditional shotcrete, The overall structure collapses at the stagnant layer; 2. Through the water collection pipe and the horizontal plane at different angles to the upper aquifer, and with different pipe lengths, the whole is divided into multiple pumping areas, and the precipitation pattern can be adjusted. Targeted regional precipitation not only improves the precipitation speed but also saves the cost of precipitation; 3. Effectively combine the prefabricated modules with the foundation pit support through the construction method, and arrange the water collection pipes reasonably, so as to achieve the expected precipitation effect and successfully complete the slope support care work.

附图说明Description of drawings

图1为一种基坑上层滞水降水坡面支护装置及施工方法的预制模块结构示意图;Fig. 1 is a kind of prefabricated module structure schematic diagram of the upper layer stagnant water dewatering slope support device and construction method of foundation pit;

图2为一种基坑上层滞水降水坡面支护装置及施工方法的集水管分布正面视图;Fig. 2 is a front view of the distribution of the water collection pipes of the upper layer of the foundation pit with stagnant water and dewatering slope support device and construction method;

图3为一种基坑上层滞水降水坡面支护装置及施工方法的整体结构示意图;3 is a schematic diagram of the overall structure of a supporting device and a construction method for the stagnant water and dewatering slope surface of the upper layer of the foundation pit;

图4为一种基坑上层滞水降水坡面支护装置及施工方法的集水管结构示意图;Figure 4 is a schematic structural diagram of a water collection pipe of the upper layer of the foundation pit for stagnant water and dewatering slope support device and construction method;

图5为一种基坑上层滞水降水坡面支护装置及施工方法的外部防护网结构示意图。Fig. 5 is a schematic diagram of the structure of an external protective net of a supporting device and a construction method for the stagnant and dewatering slope surface of the upper layer of the foundation pit.

图中:1、预制模块;2、连接筋;3、排水部件;4、动力部分;5、连接管;6、集水管;101、排水孔;102、通孔;201、横杆;202、竖杆;401、真空泵;402、集水沉淀池;403、外接排水总管;601、主管道;602、滤管;603、进孔;604、塑料管;605、细滤网;606、支撑架;607、粗滤网;608、外部防护网;609、缺口。In the figure: 1. Prefabricated module; 2. Connecting rib; 3. Drainage part; 4. Power part; 5. Connecting pipe; 6. Water collecting pipe; 101, Drainage hole; 102, Through hole; Vertical rod; 401, vacuum pump; 402, water collection sedimentation tank; 403, external drainage main pipe; 601, main pipe; 602, filter pipe; 603, inlet hole; 604, plastic pipe; 605, fine filter; 606, support frame ; 607, coarse filter; 608, external protective net; 609, gap.

具体实施方式Detailed ways

为使本发明的目的、技术方案和优点更加清楚明了,下面结合具体实施方式并参照附图,对本发明进一步详细说明。应该理解,这些描述只是示例性的,而并非要限制本发明的范围。此外,在以下说明中,省略了对公知结构和技术的描述,以避免不必要地混淆本发明的概念。In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present invention.

具体实施方式一:结合图1-5所示,一种基坑上层滞水降水坡面支护装置,其特征在于,包括:Specific embodiment 1: With reference to Figures 1-5, a support device for the upper layer of the foundation pit with stagnant water and dewatering slope surface is characterized in that, it includes:

预制模块1,预制模块1呈矩形并在后面设有连接筋2;Prefabricated module 1, the prefabricated module 1 is rectangular and is provided with connecting ribs 2 at the back;

连接筋2包括多根等距横向布置的横杆201,以及沿横杆201等距垂直布置的多根竖杆202,横杆201和竖杆202的两端均弯曲为弧形状,预制模块1上设有多个排水孔101,且两侧设有多个通孔102;The connecting rib 2 includes a plurality of horizontal bars 201 equidistantly arranged horizontally, and a plurality of vertical bars 202 vertically arranged at equal intervals along the horizontal bars 201. Both ends of the horizontal bars 201 and the vertical bars 202 are bent into arc shapes. There are a plurality of drainage holes 101 on the top, and a plurality of through holes 102 on both sides;

排水部件3,排水部件3包括动力部分4、连接管5和集水管6;多个集水管6通过连接管5与动力部分4连接,多个集水管6沿坡面支护长度方向并与水平面呈固定角度倾斜布置,且相邻两个集水管6的长度不同;利用铁丝通过通孔102与横杆201连接固定,而竖杆202与喷射混凝土形成的坡面支护结构连接,同时横杆201和竖杆202两端为弯曲的弧形状,方便连接,而且通过排水孔101可以观察渗水情况;Drainage part 3, the drainage part 3 includes a power part 4, a connection pipe 5 and a water collection pipe 6; a plurality of water collection pipes 6 are connected with the power part 4 through the connection pipe 5, and the plurality of water collection pipes 6 are supported along the length of the slope and are connected to the horizontal plane. It is inclined at a fixed angle, and the lengths of the two adjacent water collecting pipes 6 are different; the iron wire is connected and fixed with the cross bar 201 through the through hole 102, and the vertical bar 202 is connected with the slope support structure formed by shotcrete, while the cross bar is connected and fixed. Both ends of the 201 and the vertical rod 202 are curved arc shapes, which are convenient for connection, and the water seepage can be observed through the drainage hole 101;

根据滞水层情况沿着坡面支护长度方向,呈间距布置倾斜的集水管6,同时相邻两个集水管6长度不同,其中,较长的集水管6与水平面之间的夹角较小,而较短的集水管6则与水平面夹角较大,从而依靠长短结合,将滞水层划分为多个区域降水,根据需要全部启动集水管6满足前期的快速降水,或者部分启动集水管6进行后期的定期降水问题,节省了降水成本;其中,在连接管5与集水管6之间加装阀门实现控制开闭。According to the condition of the stagnant layer, along the length of the slope support, the inclined water collecting pipes 6 are arranged at intervals, and the lengths of the two adjacent water collecting pipes 6 are different. The angle between the longer water collecting pipe 6 and the horizontal plane is relatively Small, and the shorter water collecting pipe 6 has a larger angle with the horizontal plane, so depending on the combination of length and short, the stagnant layer is divided into multiple areas for precipitation, and all the water collecting pipes 6 are activated as needed to meet the rapid precipitation in the early stage, or part of the collection pipe is activated. The water pipe 6 carries out the regular precipitation problem in the later period, which saves the cost of precipitation; wherein, a valve is installed between the connecting pipe 5 and the water collecting pipe 6 to control the opening and closing.

结合图2所示,动力部分4包括依次连接的真空泵401、集水沉淀池402和外接排水总管403,真空泵401与连接管5连接;真空泵401通过连接管5对集水管6抽取,实现负压抽取降水,水流通过后流入集水沉淀池402中,含有泥土和杂物的水流流动中,依靠重力自行沉淀,随后由外接排水总管403排出。As shown in FIG. 2 , the power part 4 includes a vacuum pump 401, a water collecting sedimentation tank 402 and an external drainage main pipe 403 connected in sequence. The vacuum pump 401 is connected with the connecting pipe 5; the vacuum pump 401 extracts the water collecting pipe 6 through the connecting pipe 5 to realize negative pressure The precipitation is extracted, and the water flows into the water collection sedimentation tank 402 after passing through. The water flow containing soil and sundries flows and settles by itself by gravity, and then is discharged by the external drainage main pipe 403 .

结合图4所示,集水管6包括主管道601和滤管602;主管道601与滤管602连接;所滤管602上设有多个梅花形的进孔603;滤管602部分深入上层滞水层内,在滤管602表面开设梅花形的进孔603便于对积水进行抽取,同时梅花形结构,增大了进水量,而且形成的边缘结构,增大了抽取时的吸力,提高工作效率;4, the water collecting pipe 6 includes a main pipe 601 and a filter pipe 602; the main pipe 601 is connected with the filter pipe 602; the filter pipe 602 is provided with a plurality of plum-shaped inlet holes 603; In the water layer, a plum-shaped inlet hole 603 is opened on the surface of the filter tube 602 to facilitate the extraction of accumulated water. At the same time, the plum-shaped structure increases the amount of water inflow, and the edge structure formed increases the suction during extraction and improves the work. efficiency;

可选的,滤管602部分由内至外依次套设有螺旋形的塑料管604、细滤网605、支撑架606、粗滤网607和外部防护网608;外部防护网608可以减少粗砂滤料的对滤管的挤压,保证通水顺畅,而粗滤网607与细滤网605完成对水流的过滤效果,同时在粗滤网607和细滤网605之间加装由多根圆柱和圆环圈组成的支撑架606,实现两者的分隔,使两者之间形成通水区域,并且有效增加了过滤效果,避免因粘连引起局部无法过滤,甚至堵塞,而且形成通水区域,便于水流通过,而螺旋形的塑料管604,水流可以沿螺旋形的塑料管604流动,起到引导进水的作用,提高抽取效率;Optionally, part of the filter tube 602 is sequentially sheathed with a spiral plastic tube 604, a fine filter screen 605, a support frame 606, a coarse filter screen 607 and an external protective screen 608 from the inside to the outside; the external protective screen 608 can reduce coarse sand The extrusion of the filter material on the filter tube ensures smooth water flow, while the coarse filter 607 and the fine filter 605 complete the filtering effect of the water flow. The support frame 606 composed of a cylinder and a circular ring realizes the separation of the two, so that a water-passing area is formed between the two, and the filtering effect is effectively increased, avoiding local inability to filter or even blockage caused by adhesion, and forming a water-passing area , to facilitate the passage of water, and the spiral plastic tube 604, the water flow can flow along the spiral plastic tube 604, which plays the role of guiding water intake and improving the extraction efficiency;

可选的,塑料管604上设有多个缺口609;沿螺旋形塑料管604的螺旋线上均匀布置弧形缺口609,可以减少塑料管604本体与滤管602的接触面积,并进一步减少对进孔603的遮挡,有效增加进水面积。Optionally, the plastic tube 604 is provided with a plurality of notches 609; evenly arranging the arc-shaped notches 609 along the helix of the helical plastic tube 604 can reduce the contact area between the plastic tube 604 body and the filter tube 602, and further reduce the The shielding of the inlet hole 603 effectively increases the water inlet area.

结合图2所示,相邻两个的集水管6长度分别为2.5米和5米,且两者之间的间距为1米;合理布置集水管6,提高结构的合理性,避免相邻两个集水管6出现抽水区域重叠,降低抽取效率。As shown in Figure 2, the lengths of two adjacent water collecting pipes 6 are 2.5 meters and 5 meters respectively, and the distance between them is 1 meter; rationally arrange the water collecting pipes 6 to improve the rationality of the structure and avoid two adjacent The water collection pipes 6 have overlapping pumping areas, which reduces the pumping efficiency.

结合图1所示,竖杆202两端超出预制模块1高度部分,且超出部分长度为250mm;竖杆202两端均超出预制模块高度250mm,同时超出部分50mm制成弯钩状,方便与上下钢筋网搭接。As shown in Figure 1, both ends of the vertical rod 202 exceed the height of the prefabricated module 1, and the length of the excess part is 250mm; both ends of the vertical rod 202 exceed the height of the prefabricated module by 250mm, and the excess part is made into a hook shape by 50mm, which is convenient to connect up and down. Reinforcing mesh lap.

结合图5所示,外部防护网608由双层的圆环组成,且表面都设有棱形的通孔,用于通水,同时在两个圆环之间,位于通孔的中心处设有隔板,并且隔板沿外部防护网608的轴心依次设置,形成支撑,同时阻挡粗砂滤料,而且隔板上还设有小孔,用于连通两侧的区域,便于水流通过,在防护的同时,有效保证水流顺利流动。As shown in FIG. 5 , the outer protective net 608 is composed of double-layered rings, and the surfaces are provided with prismatic through holes for water passage. At the same time, between the two rings, at the center of the through holes, There are baffles, and the baffles are arranged in sequence along the axis of the outer protective net 608 to form a support and block the coarse sand filter material at the same time, and there are small holes on the baffle to connect the areas on both sides to facilitate the passage of water, While protecting, it can effectively ensure the smooth flow of water.

一种基坑上层滞水降水坡面支护装置的施工方法,包括如下步骤:A construction method of a stagnant water dewatering slope support device on the upper layer of a foundation pit, comprising the following steps:

步骤一:查明基坑地区地质情况,参照地质资料,大间距布孔再局部加密钻探获取对应参数并留置水文观测孔;Step 1: Find out the geological conditions of the foundation pit area, refer to the geological data, arrange the holes with large spacing and then local infill drilling to obtain the corresponding parameters and leave the hydrological observation holes;

步骤二:根据坡面横向跨度以及对应参数确定井点孔位,并沿坡面由上层滞水层顶部长度方向依次开设深度和水平面夹角不同的孔位,形成多点位排水区域;Step 2: According to the lateral span of the slope surface and the corresponding parameters, determine the well point hole position, and along the slope surface from the top of the upper aquifer layer along the length direction of the upper aquifer layer, open hole positions with different depths and horizontal plane angles in sequence to form a multi-point drainage area;

步骤三:根据对应孔位深度沉入对应长度的集水管6,向孔位回填粗砂滤料,并在深度0.2米用黏土封口;Step 3: According to the depth of the corresponding hole, sink into the water collecting pipe 6 of the corresponding length, backfill the coarse sand filter material to the hole, and seal it with clay at a depth of 0.2 meters;

步骤四:将连接管5与集水管6连通,并通过放置在坡顶的动力部分4进行抽取降水;Step 4: Connect the connecting pipe 5 with the water collecting pipe 6, and extract precipitation through the power part 4 placed on the top of the slope;

步骤五:降水后,将预制模块1依次铺设在预留的上层滞水层区域内,并通过竖杆202与上部分预先成型的坡面支护结构连接;Step 5: After precipitation, the prefabricated modules 1 are laid in sequence in the reserved upper stagnant layer area, and connected to the upper part of the pre-formed slope support structure through vertical rods 202;

步骤六:通过施工机械继续向下开挖基坑并喷射下部的混凝土支护与预制模块1下部连接成型。Step 6: Continue to excavate the foundation pit downward through construction machinery and spray the lower concrete support to connect with the lower part of the prefabricated module 1 to form.

步骤三中在沉入集水管6前,沿集水管6分段绑定多个三角形支架滑入孔位对集水管6支撑;由于是呈角度布置集水管,相对于传统垂直布管,在回填粗砂滤料中,容易引起滤管与孔位出现局部贴附,降低抽水效果,通过分段加装三角形支架,与孔位内壁接触实现支撑,方便滤料的回填,同时保证抽水效果。In step 3, before sinking into the water collecting pipe 6, a plurality of triangular brackets are bound in sections along the water collecting pipe 6 and slide into holes to support the water collecting pipe 6; In the coarse sand filter material, it is easy to cause the local attachment of the filter tube and the hole, which reduces the pumping effect. By adding a triangular bracket in sections, it is in contact with the inner wall of the hole to realize the support, which is convenient for the backfilling of the filter material and ensures the pumping effect at the same time.

一种基坑上层滞水降水坡面支护装置的施工方法,包括如下步骤:A construction method of a stagnant water dewatering slope support device on the upper layer of a foundation pit, comprising the following steps:

步骤一:查明基坑地区地质情况,参照地质资料,大间距布孔再局部加密钻探获取对应参数并留置水文观测孔;Step 1: Find out the geological conditions of the foundation pit area, refer to the geological data, arrange the holes with large spacing and then local infill drilling to obtain the corresponding parameters and leave the hydrological observation holes;

步骤二:根据坡面横向跨度以及对应参数确定井点孔位之间相距1米,并沿坡面由上层滞水层顶部长度方向依次开设深度2.5米和5米,并与水平面夹角不同的孔位,形成多点位排水区域;Step 2: According to the lateral span of the slope surface and the corresponding parameters, the distance between the well points and holes is determined to be 1 meter, and along the slope surface, the depths of 2.5 meters and 5 meters are set in sequence from the top of the upper aquifer, and the included angle is different from the horizontal plane. Hole position, forming a multi-point drainage area;

步骤三:根据对应孔位深度2.5米和5米沉入对应长度的集水管6,向孔位回填粗砂滤料,并在深度0.5米用黏土封口;Step 3: According to the corresponding hole depth of 2.5 meters and 5 meters, sink into the water collecting pipe 6 of the corresponding length, backfill the coarse sand filter material to the hole, and seal it with clay at the depth of 0.5 meters;

步骤四:将连接管5与集水管6连通,并通过放置在坡顶的动力部分4进行抽取降水;Step 4: Connect the connecting pipe 5 with the water collecting pipe 6, and extract precipitation through the power part 4 placed on the top of the slope;

步骤五:降水后,将预制模块1依次铺设在预留的上层滞水层区域内,并通过竖杆202与上部分预先成型的坡面支护结构连接;Step 5: After precipitation, the prefabricated modules 1 are laid in sequence in the reserved upper stagnant layer area, and connected to the upper part of the pre-formed slope support structure through vertical rods 202;

步骤六:通过施工机械继续向下开挖基坑并喷射下部的混凝土支护与预制模块1下部连接成型Step 6: Continue to excavate the foundation pit through the construction machinery and spray the lower concrete support to connect with the lower part of the prefabricated module 1

其中,对应参数包括物理力学参数和渗透参数,用于判断地质的实际情况;Among them, the corresponding parameters include physical and mechanical parameters and permeability parameters, which are used to judge the actual situation of the geology;

步骤三:根据对应孔位深度沉入对应长度的集水管6,向孔位回填粗砂滤料,并在深度0.2-0.5米用黏土封口,防止漏气。Step 3: According to the depth of the corresponding hole, sink into the water collecting pipe 6 of the corresponding length, backfill the hole with coarse sand filter material, and seal it with clay at a depth of 0.2-0.5 meters to prevent air leakage.

实施例1Example 1

工程项目位于北部地区占地105.9亩,总建筑面积185000m2,项目基坑周长1110m,面积68000m2,基坑开挖深度9.0m-9.8m,基坑开挖周边无建筑物,距离市政道路及管线较远,并且基坑采用复合土钉墙放坡支护方式;The project is located in the northern area, covering an area of 105.9 mu, with a total construction area of 185,000m2. The project foundation pit has a perimeter of 1,110m and an area of 68,000m2. The excavation depth of the foundation pit is 9.0m-9.8m. It is far away, and the foundation pit adopts the grading support method of composite soil nailing wall;

首先查看地质情况,经地质查看以及资料分析显示,自上之下分别为①素填土、②粉质粘土、③细砂、④细砂、⑤粉质粘土和⑥细砂,同时经过布孔钻探获取地下水位埋深约18.0m,且地下水分布在细砂层中,从而基坑在开挖至④细砂层底部部位时出现坡面渗水情况,开挖至上层滞水层后,开挖面便出现渗水坍塌的情况,上层滞水层的细砂几乎处于“流态”,导致无法按照传统设计基坑支护方案用“喷射混凝土+钢筋网”的结构进行坡面支护(通过补充施工勘察,查明上层滞水情况,确定隔水层为⑤粉质粘土层,隔水层埋深为7.00-8.60m,厚度为0.30-0.90m。上层滞水层厚0.7m左右,上层滞水分布在④层细砂中,开挖期间依旧出现连续降雨,上层滞水水位呈上升趋势,根据勘察经验确定④细砂层渗透系数1.5×10-3cm/s);First check the geological conditions. The geological survey and data analysis show that from top to bottom are ① plain fill, ② silty clay, ③ fine sand, ④ fine sand, ⑤ silty clay and ⑥ fine sand. The groundwater level obtained by drilling is about 18.0m deep, and the groundwater is distributed in the fine sand layer, so the slope surface seepage occurs when the foundation pit is excavated to the bottom of the ④ fine sand layer. The water seepage collapse occurs on the surface, and the fine sand of the upper stagnant layer is almost in a "fluid state", which makes it impossible to use the "sprayed concrete + steel mesh" structure for slope support according to the traditional design foundation pit support scheme (by adding Construction survey, to find out the water retention situation in the upper layer, determine that the water barrier layer is ⑤silty clay layer, the buried depth of the water barrier layer is 7.00-8.60m, and the thickness is 0.30-0.90m. The upper layer water retention layer is about 0.7m thick, and the upper layer is The water is distributed in the fine sand of the ④ layer, there is still continuous rainfall during the excavation, and the water level of the upper stagnant water shows an upward trend.

传统采取的真空降水井点管均垂直使用,纵深较大,施工不便,根据坡面横向跨度以及对应参数确定井点孔位,孔位之间相距1米,并沿坡面由上层滞水层顶部长度方向依次开设深度为2.5米和5米的孔位,水平面夹角分别为25度和17度,形成多点位排水区域;The traditional vacuum dewatering well point pipes are used vertically, with large depth and inconvenient construction. The well point holes are determined according to the lateral span of the slope and the corresponding parameters. The distance between the holes is 1 meter. Holes with depths of 2.5 meters and 5 meters are opened in the top length direction, and the included angles of the horizontal plane are 25 degrees and 17 degrees respectively, forming a multi-point drainage area;

根据对应孔位2.5米和5米深度沉入对应长度的集水管6,向孔位回填粗砂滤料,并在对应深度0.4米用黏土封口;According to the depth of 2.5m and 5m in the corresponding hole, sink into the corresponding length of the collecting pipe 6, backfill the hole with coarse sand filter material, and seal it with clay at the corresponding depth of 0.4m;

将连接管5与集水管6连通,并通过放置在坡顶的动力部分4进行抽取降水,并且在安置降水井点管的同时进行了预制模块的制作,真空降水2天后,开挖基坑上层滞水层位置,坡面只有部分渗水而没有坍塌现象;The connecting pipe 5 is communicated with the water collecting pipe 6, and precipitation is extracted through the power part 4 placed on the top of the slope, and the prefabricated module is produced while the dewatering well point pipe is placed. After 2 days of vacuum precipitation, the upper layer of the foundation pit is excavated. In the position of the stagnant layer, the slope surface only sees water partially without collapse;

降水后,将预制模块1依次铺设在预留的上层滞水层区域内,并通过竖杆202与上部分预先成型的坡面支护的钢筋结构连接,施工快,拼接简单;After the precipitation, the prefabricated modules 1 are laid in sequence in the reserved upper stagnant layer area, and connected with the upper pre-formed reinforced steel structure supported by the slope through the vertical rod 202, the construction is fast and the splicing is simple;

通过施工机械继续向下开挖基坑并喷射下部的混凝土支护与预制模块1下部连接成型,完成整体的施工;Continue to excavate the foundation pit downward through the construction machinery and spray the lower concrete support to connect with the lower part of the prefabricated module 1 to complete the overall construction;

项目完成整体进程顺利,安置降水井点管同时进行了预制模块的制作,真空降水2天后,开挖基坑上层滞水层位置,坡面只有部分渗水而没有坍塌现象,安置预制模块1后,会有少量水从预留排水孔渗出,当遇到连续降雨天气,预留排水孔渗水较多时,开启真空泵401,通过集水管6很好的防止大量上层滞水出现而破会支护好的坡面,工程整体进度有效得到了提升,同时避免了支护因渗水坍塌的情况,而且利用多点位排水区域根据不同的渗水状况,选择性排水,降低了排水成本。The overall process of the completion of the project was smooth. The prefabricated modules were installed at the same time as the dewatering well point pipes were placed. After 2 days of vacuum dewatering, the upper aquifer layer of the foundation pit was excavated, and the slope was only partially seeped without collapse. After the prefabricated module 1 was placed, There will be a small amount of water seepage from the reserved drainage holes. When encountering continuous rainy weather, when there is a lot of water seepage in the reserved drainage holes, turn on the vacuum pump 401, and through the water collecting pipe 6, it is very good to prevent a large amount of stagnant water in the upper layer from appearing and breaking, and it will be well supported. The overall progress of the project has been effectively improved, and at the same time, the collapse of the support due to water seepage is avoided, and the multi-point drainage area is used to selectively drain according to different seepage conditions, reducing the drainage cost.

应当理解的是,本发明的上述具体实施方式仅仅用于示例性说明或解释本发明的原理,而不构成对本发明的限制。因此,在不偏离本发明的精神和范围的情况下所做的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。此外,本发明所附权利要求旨在涵盖落入所附权利要求范围和边界、或者这种范围和边界的等同形式内的全部变化和修改例。It should be understood that the above-mentioned specific embodiments of the present invention are only used to illustrate or explain the principle of the present invention, but not to limit the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the protection scope of the present invention. Furthermore, the appended claims of this invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalents of such scope and boundaries.

Claims (9)

1. The utility model provides a domatic supporting device of stagnant water precipitation in foundation ditch upper strata which characterized in that includes:
the prefabricated module (1), the prefabricated module (1) is rectangular and is provided with a connecting rib (2) at the back;
the connecting rib (2) comprises a plurality of cross rods (201) which are equidistantly and transversely arranged and a plurality of vertical rods (202) which are equidistantly and vertically arranged along the cross rods (201), two ends of each of the cross rods (201) and the vertical rods (202) are bent into arc shapes, a plurality of drain holes (101) are formed in the prefabricated module (1), and a plurality of through holes (102) are formed in two sides of the prefabricated module;
a water discharging part (3), wherein the water discharging part (3) comprises a power part (4), a connecting pipe (5) and a water collecting pipe (6); a plurality of collector pipe (6) are connected with power part (4) through connecting pipe (5), and are a plurality of collector pipe (6) are followed domatic length direction of strutting and are personally submitted fixed angle slope with the level and arrange, and the length of two adjacent collector pipe (6) is different.
2. The foundation pit upper layer stagnant water precipitation slope supporting device of claim 1 characterized in that: the power part (4) comprises a vacuum pump (401), a water collecting sedimentation tank (402) and an external drainage main pipe (403) which are sequentially connected, and the vacuum pump (401) is connected with the connecting pipe (5).
3. The foundation pit upper layer stagnant water precipitation slope supporting device of claim 1 characterized in that: the water collecting pipe (6) comprises a main pipe (601) and a filter pipe (602); the main pipeline (601) is connected with a filter pipe (602); the filter tube (602) is provided with a plurality of quincunx inlet holes (603).
4. The foundation pit upper layer stagnant water precipitation slope supporting device of claim 3 characterized in that: the filter tube (602) is sleeved with a spiral plastic tube (604), a fine filter screen (605), a support frame (606), a coarse filter screen (607) and an external protective net (608) from inside to outside in sequence.
5. The foundation pit upper layer stagnant water precipitation slope supporting device of claim 4, characterized in that: the plastic pipe (604) is provided with a plurality of notches (609).
6. The foundation pit upper layer stagnant water precipitation slope supporting device of claim 1 characterized in that: the lengths of the adjacent two water collecting pipes (6) are respectively 2.5 meters and 5 meters, and the distance between the two water collecting pipes is 1 meter.
7. The foundation pit upper layer stagnant water precipitation slope supporting device of claim 1 characterized in that: the two ends of the vertical rod (202) exceed the height part of the prefabricated module (1), and the length of the exceeding part is 250 mm.
8. The construction method of the foundation pit upper layer stagnant water precipitation slope support device according to claim 1, characterized in that: the method comprises the following steps:
the method comprises the following steps: finding out the geological condition of a foundation pit area, referring to geological data, arranging holes at large intervals, then performing local encrypted drilling to obtain corresponding parameters and reserving hydrological observation holes;
step two: determining well point hole sites according to the transverse span of the slope and corresponding parameters, and sequentially forming hole sites with different depths and horizontal included angles along the length direction of the slope from the top of an upper stagnant water layer to form a multi-point drainage area;
step three: sinking a water collecting pipe (6) with a corresponding length according to the depth of the corresponding hole position, backfilling coarse sand filter materials into the hole position, and sealing the hole position with clay at the depth of 0.2-0.5 m;
step four: the connecting pipe (5) is communicated with the water collecting pipe (6), and the power part (4) placed on the top of the slope is used for extracting precipitation;
step five: after precipitation, the prefabricated modules (1) are sequentially laid in the reserved upper water layer stagnation area and are connected with a slope supporting structure which is formed in advance on the upper portion through vertical rods (202);
step six: and continuously downwards excavating the foundation pit through the construction machinery, and spraying the concrete support at the lower part to be connected and molded with the lower part of the prefabricated module (1).
9. The construction method of the foundation pit upper layer stagnant water precipitation slope support device according to claim 8, characterized in that: and in the third step, before the water collecting pipe (6) is sunk, a plurality of triangular supports are bound along the water collecting pipe (6) in a segmented manner and slide into hole positions to support the water collecting pipe (6).
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