CN107059882A - Arch anchor net and Anchor-Pile Retaining Structure structure - Google Patents
Arch anchor net and Anchor-Pile Retaining Structure structure Download PDFInfo
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- CN107059882A CN107059882A CN201710249474.3A CN201710249474A CN107059882A CN 107059882 A CN107059882 A CN 107059882A CN 201710249474 A CN201710249474 A CN 201710249474A CN 107059882 A CN107059882 A CN 107059882A
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- 239000002689 soil Substances 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000004567 concrete Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000009412 basement excavation Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
本发明公开了一种拱形锚网与桩锚联合支护结构,设置在基坑侧壁,该结构包括沿竖直方向固定在基坑内底的若干个支护桩、连接在相邻的至少两个所述的支护桩之间的腰梁及连接在相邻的两个所述的支护桩之间的拱形挡板,穿过所述的拱形挡板向基坑侧壁土体内延伸设置有若干个土钉,穿过所述的腰梁及所述的支护桩向基坑侧壁土体内延伸设置有若干个预应力锚杆。该结构的有益效果:(a)通过增设拱形挡板与支护桩连成整体,增加了侧向刚度,减小了支护桩变形及配筋量;(b)拱形挡板内增设土钉,减小了支护桩受力,从而减小了锚杆长度;(c)拱形挡板兼挡土及挡水功能,改变了传统桩锚支护体系存在的不足。
The invention discloses an arch anchor net and pile-anchor combined support structure, which is arranged on the side wall of the foundation pit. The structure includes several support piles fixed on the inner bottom of the foundation pit along the vertical direction, The waist beam between the two supporting piles and the arched baffle connected between the two adjacent supporting piles pass through the arched baffle to the side wall soil of the foundation pit. A plurality of soil nails are extended, and a plurality of prestressed anchor rods are extended into the soil body of the side wall of the foundation pit through the waist beam and the support pile. Beneficial effects of the structure: (a) by adding an arched baffle and supporting piles as a whole, the lateral stiffness is increased, and the deformation and reinforcement of the supporting piles are reduced; (b) the arched baffle is equipped with Soil nails reduce the stress on the supporting piles, thereby reducing the length of the anchor rods; (c) the arched baffle has both soil and water retaining functions, which has changed the shortcomings of the traditional pile-anchor support system.
Description
技术领域technical field
本发明涉及基坑支护体系,特别是涉及一种拱形锚网与桩锚联合支护结构。The invention relates to a foundation pit support system, in particular to an arched anchor net and pile-anchor joint support structure.
背景技术Background technique
基坑是指为了修筑建筑物(包括构筑物)的基础与地下室、埋设市政工程管道以及开发地下空间(如地下车站、商场等)所开挖的地面以下的空间。基坑支护是指为保护地下结构及基坑周边环境的安全,对基坑侧壁及周边环境所采取的支挡、加固及保护等工程措施。The foundation pit refers to the space below the ground excavated for the purpose of building the foundation and basement of buildings (including structures), burying municipal engineering pipelines, and developing underground spaces (such as underground stations, shopping malls, etc.). Foundation pit support refers to engineering measures such as support, reinforcement and protection for the side walls of the foundation pit and the surrounding environment to protect the safety of the underground structure and the surrounding environment of the foundation pit.
基坑工程的支护结构的基本类型有:放坡开挖及简易支护、悬臂式支护结构、水泥土桩墙支护结构、内撑式支护结构、桩锚式支护结构、土钉墙支护结构、逆作法以及其他支护结构。在这些基坑支护结构中,桩锚支护结构是经常采用的一种支护结构,并且得到了持续广泛的应用。The basic types of support structures for foundation pit engineering include: grading excavation and simple support, cantilever support structure, cement-soil pile wall support structure, internal support structure, pile-anchor support structure, soil Nail wall support structures, top-down methods and other support structures. Among these foundation pit support structures, the pile-anchor support structure is a frequently used support structure, and has been continuously and widely used.
桩锚支护结构由钢筋混凝土灌注桩和水平向或者斜向预应力锚杆构成,桩锚支护结构根据基坑的开挖深度和基坑周围环境等可分为单支点桩锚支护结构和多支点桩锚支护结构。预应力锚杆由自由段和锚固段组成,锚杆施加的预应力由锚杆锚固段提供的锚固力承担。The pile-anchor support structure is composed of reinforced concrete pouring piles and horizontal or oblique prestressed anchor rods. The pile-anchor support structure can be divided into single-point pile-anchor support structures according to the excavation depth of the foundation pit and the surrounding environment of the foundation pit. And multi-pivot pile-anchor support structure. The prestressed anchor is composed of a free section and an anchor section, and the prestress applied by the anchor is borne by the anchoring force provided by the anchor section of the anchor.
在基坑开挖过程中,由于基坑土体压力作用,支护桩桩体处于受弯状态,锚杆处于受拉状态。由于锚杆对桩体提供了支撑力,使桩体在水平土压力作用下内力分布趋于均匀,桩身受力较悬臂状态时合理。预先施加的锚杆预应力,使桩锚支护结构在基坑开挖过程中,坑壁水平位移得到有效的控制、抗倾覆稳定性得到很大的提高,桩体的嵌固深度得到显著缩短,施工难度和工程投资得到很大程度的降低。因此桩锚支护结构作为工程实践中常用的支护结构形式,在支护工程中应用广泛。During the excavation of the foundation pit, due to the pressure of the foundation pit soil, the pile body of the supporting pile is in a state of bending, and the anchor rod is in a state of tension. Because the anchor provides support for the pile body, the internal force distribution of the pile body tends to be even under the action of horizontal earth pressure, and the force on the pile body is more reasonable than that in the cantilever state. The pre-applied anchor bolt prestress enables the pile-anchor support structure to effectively control the horizontal displacement of the pit wall during the excavation of the foundation pit, greatly improves the anti-overturning stability, and significantly shortens the embedded depth of the pile body , Construction difficulty and engineering investment are greatly reduced. Therefore, the pile-anchor support structure, as a commonly used support structure form in engineering practice, is widely used in support engineering.
但现有的技术存在下面两大缺点:(1)排桩侧向刚度小,在土压力作用下,跨中附近通常会产生较大的弯矩,会发生比较大的弯曲变形,使得灌注桩的直径和配筋设计较大;(2)当基坑深度较大或土质条件较差时,锚杆提供的预应力通常较高,此时需要较大的锚固长度,而通常情况下基坑周围环境比较差,城区地质环境比较复杂,地下水位较高,且坑外可使用的空间较小,这些就给桩锚支护结构的应用带来很大的限制,也给桩锚支护结构的设计和施工带来极大困难。However, the existing technology has the following two major disadvantages: (1) The lateral stiffness of the pile row is small. Under the action of earth pressure, a large bending moment will usually occur near the mid-span, and relatively large bending deformation will occur, making the cast-in-place pile (2) When the depth of the foundation pit is large or the soil condition is poor, the prestress provided by the anchor is usually high, and a large anchorage length is required at this time, and usually the foundation pit The surrounding environment is relatively poor, the urban geological environment is relatively complex, the groundwater level is high, and the space available outside the pit is small, which has brought great restrictions to the application of the pile-anchor support structure, and also imposed great restrictions on the application of the pile-anchor support structure. The design and construction of the project brought great difficulties.
发明内容Contents of the invention
本发明实施例提供一种拱形锚网与桩锚联合支护结构,强度高,且兼具挡土和挡水的功能,易实施。The embodiment of the present invention provides an arched anchor net and pile-anchor combined support structure, which has high strength, and has the functions of retaining soil and water, and is easy to implement.
拱形锚网与桩锚联合支护结构,设置在基坑侧壁,该结构包括沿竖直方向固定在基坑内底的若干个支护桩、连接在相邻的至少两个所述的支护桩之间的腰梁及连接在相邻的两个所述的支护桩之间的拱形挡板,穿过所述的拱形挡板向基坑侧壁土体内延伸设置有若干个土钉,穿过所述的腰梁及所述的支护桩向基坑侧壁土体内延伸设置有若干个预应力锚杆。Arched anchor net and pile-anchor joint support structure is arranged on the side wall of the foundation pit, and the structure includes several support piles fixed on the inner bottom of the foundation pit along the vertical direction, connected to at least two adjacent support piles. The waist beam between the retaining piles and the arched baffles connected between the two adjacent supporting piles pass through the arched baffles and extend into the soil body of the side wall of the foundation pit. Nails, passing through the waist beam and the support piles to extend into the soil body of the side wall of the foundation pit are provided with several prestressed anchor rods.
优选地,所述的拱形挡板呈圆弧状拱形。Preferably, the arched baffle is arc-shaped.
优选地,所述的腰梁、所述的土钉及所述的预应力锚杆均为钢质结构。Preferably, the waist beam, the soil nail and the prestressed anchor rod are all steel structures.
优选地,所述的支护桩和所述的拱形挡板均为混凝土结构。Preferably, both the support piles and the arched baffle are of concrete structure.
优选地,所述的预应力锚杆向下倾斜设置。Preferably, the prestressed anchor rod is arranged inclined downward.
优选地,所述的腰梁包括上下平行设置的多个。Preferably, the waist beam includes a plurality of upper and lower parallel beams.
本发明的支护结构的有益效果:(a)通过增设拱形挡板与支护桩连成整体,增加了侧向刚度,减小了支护桩变形及配筋量;(b)拱形挡板内增设土钉,减小了支护桩受力,从而减小了锚杆长度;(c)拱形挡板兼挡土及挡水功能,改变了传统桩锚支护体系存在的不足。Beneficial effects of the support structure of the present invention: (a) by adding an arched baffle and connecting the support piles into a whole, the lateral stiffness is increased, and the deformation and reinforcement amount of the support piles are reduced; (b) the arched Adding soil nails in the baffle reduces the stress on the supporting piles, thereby reducing the length of the anchor rod; (c) the arched baffle has both soil and water retaining functions, which has changed the shortcomings of the traditional pile-anchor support system .
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.
图1为本发明实施例提供的拱形锚网与桩锚联合支护结构的结构示意图(土体透明示意);Fig. 1 is the structural schematic diagram (soil body transparent schematic) of the arched anchor net and pile-anchor combined support structure provided by the embodiment of the present invention;
图2为本发明实施例提供的拱形锚网与桩锚联合支护结构的俯视图(土体透明示意);Fig. 2 is the top view of the arched anchor net and pile-anchor combined support structure provided by the embodiment of the present invention (transparent soil body schematic);
图3为本发明实施例提供的拱形锚网与桩锚联合支护结构的受力图一;Fig. 3 is the force diagram 1 of the arched anchor net and pile-anchor combined support structure provided by the embodiment of the present invention;
图4为本发明实施例提供的拱形锚网与桩锚联合支护结构的受力图二。Fig. 4 is the force diagram 2 of the arched anchor net and pile-anchor combined support structure provided by the embodiment of the present invention.
附图标记说明:Explanation of reference signs:
1-支护桩,2-腰梁,3-拱形挡板,4-土钉,5-预应力锚杆;1-support pile, 2-waist beam, 3-arch baffle, 4-soil nail, 5-prestressed anchor rod;
A-土体对支护结构的作用力,B-预应力锚杆的拉力;C-土钉的拉力。A-the force of the soil on the supporting structure, B-the tension of the prestressed anchor rod; C-the tension of the soil nail.
具体实施方式detailed description
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
如图1及图2所示,一种拱形锚网与桩锚联合支护结构,设置在基坑侧壁,该结构包括沿竖直方向固定在基坑内底的若干个支护桩1、连接在相邻的至少两个所述的支护桩1之间的腰梁2及连接在相邻的两个所述的支护桩1之间的拱形挡板3,穿过所述的拱形挡板3向基坑侧壁土体内延伸设置有若干个土钉4,穿过所述的腰梁2及所述的支护桩1向基坑侧壁土体内延伸设置有若干个预应力锚杆5,所述的拱形挡板3呈圆弧状拱形,其中,预应力锚杆5包括靠近支护桩1的自由段和与该自由段相连接的锚固段,所述的腰梁2、所述的土钉4及所述的预应力锚杆5均为钢质结构,所述的支护桩1和所述的拱形挡板3均为混凝土结构,所述的预应力锚杆5向下倾斜设置,所述的腰梁2包括上下平行设置的多个。As shown in Figure 1 and Figure 2, an arch anchor net and pile-anchor combined support structure is arranged on the side wall of the foundation pit, and the structure includes several support piles 1, The waist beam 2 connected between at least two adjacent support piles 1 and the arched baffle 3 connected between the adjacent two described support piles 1 pass through the The arched baffle 3 extends into the soil body of the side wall of the foundation pit, and several soil nails 4 are arranged, and a plurality of prestressed anchors are arranged extending through the waist beam 2 and the support pile 1 into the soil body of the side wall of the foundation pit. Rod 5, the arched baffle plate 3 is arc-shaped arched, wherein the prestressed anchor rod 5 includes a free section close to the support pile 1 and an anchoring section connected to the free section, the waist beam 2. The soil nails 4 and the prestressed anchor rods 5 are steel structures, the support piles 1 and the arched baffles 3 are all concrete structures, and the prestressed anchors The rod 5 is arranged obliquely downwards, and the waist beam 2 includes a plurality of vertically arranged in parallel.
如图3和图4所示,基坑侧壁的土体对整个支护结构的作用力A均由预应力锚杆5的拉力B的水平方向分力和土钉4的拉力C的水平方向分力来平衡,进而保证整个结构不坍塌,保证施工安全。As shown in Figure 3 and Figure 4, the force A of the soil on the side wall of the foundation pit on the entire support structure is composed of the horizontal component of the tension B of the prestressed anchor rod 5 and the horizontal direction of the tension C of the soil nail 4 The components are used to balance, so as to ensure that the entire structure does not collapse and ensure construction safety.
该支护结构中:(1)支护桩1起挡土墙的作用,承受基坑侧壁土体传来的水平压力;(2)拱形挡板3形成空间刚度,与支护桩1形成整体,减小支护体系水平变形;(3)预应力锚杆5分为自由段和锚固段,起拉接支护桩1的作用,同时减小桩水平变形;(4)土钉4锚固在土体中,起拉接拱形挡板3作用;(5)腰梁2固定预应力锚杆5,同时与支护桩1形成整体,起到圈梁作用。In this support structure: (1) the support pile 1 acts as a retaining wall and bears the horizontal pressure from the soil on the side wall of the foundation pit; (2) the arched baffle 3 forms a space rigidity, Form a whole to reduce the horizontal deformation of the support system; (3) The prestressed anchor rod 5 is divided into a free section and an anchor section, which plays the role of tensioning and supporting the pile 1, and at the same time reduces the horizontal deformation of the pile; (4) The soil nail 4 Anchored in the soil, it plays the role of pulling the arched baffle 3; (5) the waist beam 2 fixes the prestressed anchor rod 5, and at the same time forms a whole with the support pile 1, and plays the role of a ring beam.
本发明的支护结构经室内实验和现场实验,结果表明:(a)在桩间设置拱形锚网可以与桩体共同形成连续的挡土结构,结构刚度增大30%以上,起到限制桩土位移的作用;桩后与拱板土压力值相差不大,并且分布形式基本相似,最大值均比不设置拱形锚网时的土压力最大值要小,说明拱形锚网对土压力起到调整作用,这样桩的变形及配筋量比不设拱形挡板的桩要小;(b)拱形挡板内增设土钉,分担了20%-30%土压力,减小了作用在支护桩上压力,从而减小了锚杆长度;(c)很直观支护桩与拱形挡板形成的整体结构体系,具有较好的挡土与挡水功能,给建筑基础施工提供了良好的作业条件。The supporting structure of the present invention is through laboratory experiments and field experiments, and the results show that: (a) arched anchor nets can be set between piles to form a continuous soil retaining structure together with the pile body, and the structural rigidity can be increased by more than 30%, which plays a limiting role. The effect of pile-soil displacement; the soil pressure values behind the pile and the arch slab are not much different, and the distribution forms are basically similar. The pressure plays an adjustment role, so that the deformation and reinforcement of the pile are smaller than those without the arched baffle; (b) soil nails are added in the arched baffle to share 20%-30% of the earth pressure, reducing The pressure acting on the support pile is reduced, thereby reducing the length of the anchor rod; (c) the overall structural system formed by the support pile and the arched baffle has a good function of retaining soil and water, and provides a good foundation for the building. Construction provides good working conditions.
综上,本设计的支护结构能够达到以下技术效果:(a)通过增设拱形挡板与支护桩连成整体,增加了侧向刚度,减小了支护桩变形及配筋量;(b)拱形挡板内增设土钉,减小了支护桩受力,从而减小了锚杆长度;(c)拱形挡板兼挡土及挡水功能,改变了传统桩锚支护体系存在的不足。In summary, the support structure of this design can achieve the following technical effects: (a) By adding an arched baffle and connecting the support piles as a whole, the lateral stiffness is increased, and the deformation and reinforcement of the support piles are reduced; (b) Soil nails are added in the arched baffle, which reduces the stress on the supporting piles, thereby reducing the length of the anchor rod; (c) The arched baffle has both soil and water retaining functions, changing the traditional pile anchor deficiencies in the protection system.
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。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. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.
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Cited By (7)
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CN108222017A (en) * | 2018-02-02 | 2018-06-29 | 江苏工程职业技术学院 | A kind of H profile steel anchor pole composite pile-prefabricated board wall base pit enclosure construction method |
CN109235447A (en) * | 2018-10-11 | 2019-01-18 | 安徽省城建设计研究总院股份有限公司 | A kind of horizontal arch shell foundation pit support device |
CN110055974A (en) * | 2019-04-24 | 2019-07-26 | 兰州理工大学 | A kind of recyclable miniature steel pipe pile soil nailing combined support structure and its recovery method |
CN110206042A (en) * | 2019-06-18 | 2019-09-06 | 深圳市中天基础勘测设计有限公司 | A kind of foundation pit of network column supporting |
CN109505229B (en) * | 2018-12-13 | 2021-02-23 | 中交一公局桥隧工程有限公司 | Stress balance and vibration-damping disaster-prevention high pier structure for high and steep side slope of highway and construction method |
CN112921979A (en) * | 2021-01-25 | 2021-06-08 | 北京市地质工程公司 | High strength underground structure |
CN113622435A (en) * | 2021-09-17 | 2021-11-09 | 中煤长江基础建设有限公司 | Multistage expansion supporting device and construction method thereof |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108222017A (en) * | 2018-02-02 | 2018-06-29 | 江苏工程职业技术学院 | A kind of H profile steel anchor pole composite pile-prefabricated board wall base pit enclosure construction method |
CN108222017B (en) * | 2018-02-02 | 2019-11-26 | 江苏工程职业技术学院 | A kind of H profile steel anchor pole composite pile-prefabricated board wall base pit enclosure construction method |
CN109235447A (en) * | 2018-10-11 | 2019-01-18 | 安徽省城建设计研究总院股份有限公司 | A kind of horizontal arch shell foundation pit support device |
CN109505229B (en) * | 2018-12-13 | 2021-02-23 | 中交一公局桥隧工程有限公司 | Stress balance and vibration-damping disaster-prevention high pier structure for high and steep side slope of highway and construction method |
CN110055974A (en) * | 2019-04-24 | 2019-07-26 | 兰州理工大学 | A kind of recyclable miniature steel pipe pile soil nailing combined support structure and its recovery method |
CN110206042A (en) * | 2019-06-18 | 2019-09-06 | 深圳市中天基础勘测设计有限公司 | A kind of foundation pit of network column supporting |
CN112921979A (en) * | 2021-01-25 | 2021-06-08 | 北京市地质工程公司 | High strength underground structure |
CN113622435A (en) * | 2021-09-17 | 2021-11-09 | 中煤长江基础建设有限公司 | Multistage expansion supporting device and construction method thereof |
CN113622435B (en) * | 2021-09-17 | 2023-02-28 | 中煤长江基础建设有限公司 | Multistage expansion supporting device and construction method thereof |
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