CN107642095B - Construction method for reinforcing rigidity of side wall of foundation pit by composite soil nailing wall support - Google Patents
Construction method for reinforcing rigidity of side wall of foundation pit by composite soil nailing wall support Download PDFInfo
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Abstract
The invention discloses a construction method for reinforcing the rigidity of the side wall of a foundation pit by a composite soil nailing wall support, which is a construction method for limiting the deformation of the side wall of a flexible support foundation pit by uniformly arranging and increasing a rigid stress surface at a waist beam of a prestressed anchor rod of the side wall of a composite soil nailing wall according to a proper distance by using but not limited to steel pipes, channel steel, battens and phyllostachys pubescens which have certain rigidity and certain contact surfaces. The temporary name is a composite soil nail wall reinforced waist slab beam system.
Description
[ technical field ]
The invention relates to a construction method for reinforcing the rigidity of the side wall of a foundation pit by a composite soil nailing wall support, in particular to a construction method for limiting the deformation of the side wall of a flexible support foundation pit by uniformly distributing and increasing a rigid stress surface at a waist beam of a prestressed anchor rod of the side wall of a composite soil nailing wall according to a proper distance by utilizing but not limited to steel pipes, channel steel, battens and phyllostachys pubescens. The temporary name is a composite soil nail wall reinforced waist slab beam system.
[ background art ]
The composite soil nailing wall technology combines a soil nailing wall with a deep mixing pile, a jet grouting pile, a tree root pile, a steel pipe soil nail and a prestressed anchor rod, and forms a composite foundation pit supporting technology through various combinations. The composite soil nailing wall support has the characteristics of light weight, flexibility, wide application range, low manufacturing cost, short construction period, safety, reliability and the like, has strong support capability, can be used as an advance support, and has the effects of support, water interception and the like. In actual engineering, all the technologies forming the composite soil nailing wall can be flexibly and organically combined according to engineering requirements, the form is various, and the composite soil nailing wall is a foundation pit supporting technology which is simple and convenient to construct, economic and reasonable and has prominent comprehensive performance and is widely applied to engineering.
The working mechanism is as follows: the soil nailing wall consists of an in-situ soil body, soil nails arranged in the soil and a sprayed concrete surface layer. Through the combined action of the soil nails, the wall surface and the undisturbed soil body, a complex based on an active restriction mechanism is formed, and the composite has the characteristics of obviously improving the structural strength and the deformation resistance of the side slope soil body, reducing the lateral deformation of the soil body and enhancing the overall stability. Therefore, the supporting effect is comprehensively determined by the factors of the length and the setting density of the soil nails, the tensile strength, the bending strength and the shear strength of the soil nails, the bonding strength of the soil nails and the soil body, the rigidity of the surface wall, the combination degree of the soil nails and the surface wall, the properties of an undisturbed soil body, the load of the slope top, the excavation depth and the like.
The composite soil nailing wall is a flexible support, the rigidity of a surface wall is a weak point of the support, particularly when the in-situ local soil body is poor or the support part has certain deformation control requirements but is not very high, the rigid support (a support pile or an underground continuous wall) is wasted, and the current general method adopted in the market is to add micro piles (also called root piles) at proper intervals on the side wall of a foundation pit to strengthen the overall rigidity of a support structure so as to control the deformation and prevent local instability. This structure currently has two disadvantages: firstly, when the micro piles are densely arranged, the manufacturing cost is high, when the micro piles are sparsely arranged, the reinforcement of an in-situ soil body is limited, the construction is complicated, secondly, the function exerted by the prestressed anchor rods is limited, the prestressed anchor rods act on the soil body on the side wall of the foundation pit through the waist beam, the contact surface of the waist beam and the surface wall is limited, the waist beam part is concave when the prestress is exerted, and other flexible surface walls are protruded, so that the problem of support is caused. To solve these problems, the conventional method is to reinforce the micro-piles by means of encryption, but the manufacturing cost is greatly increased.
[ summary of the invention ]
The invention aims to provide a construction method which is economical and convenient to construct, can well enhance the rigidity of the side wall of a foundation pit, furthest plays the action range of a prestressed anchor rod and controls the deformation.
One technical scheme for achieving the purpose comprises the following process steps:
(1) after the prestressed anchor rod part is constructed on the side wall of the foundation pit, hanging a reinforcing mesh under the working condition of the layer, and binding a waist beam;
(2) steel pipes with the length of 1.0-2.0 m, the length phi of 48 or more and the distance of 0.5-1.0 m are vertically arranged between the reinforcing mesh and the waist beam along the direction of the waist beam, and are firmly bound or welded with the reinforcing steel bars of the waist beam and the reinforcing steel bars of the surface layer;
(3) installing a waist beam template, spraying a concrete surface layer and spraying a concrete waist beam;
(4) and (5) tensioning the prestressed anchor rod.
The other technical scheme of the invention comprises the following process steps:
(1) after the prestressed anchor rod part is constructed on the side wall of the foundation pit, hanging a reinforcing mesh under the working condition of the layer, and binding a waist beam;
(2) channel steel with the length of 1.0-2.0 m and the distance of 0.5-1.0 m is vertically arranged between the reinforcing mesh and the wale along the wale direction, and is firmly bound or welded with wale reinforcing steel bars and surface layer reinforcing steel bars;
(3) installing a waist beam template, spraying a concrete surface layer and spraying a concrete waist beam;
(4) and (5) tensioning the prestressed anchor rod.
The other technical scheme of the invention comprises the following process steps:
(1) after the prestressed anchor rod part is constructed on the side wall of the foundation pit, hanging a reinforcing mesh under the working condition of the layer, and binding a waist beam;
(2) wood battens with the length of 1.0-2.0 m and the distance of 0.5-1.0 m are vertically arranged between the reinforcing mesh and the waist beam along the direction of the waist beam, and are firmly bound with the reinforcing steel bars of the waist beam and the reinforcing steel bars of the surface layer;
(3) installing a waist beam template, spraying a concrete surface layer and spraying a concrete waist beam;
(4) and (5) tensioning the prestressed anchor rod.
The other technical scheme of the invention comprises the following process steps:
(1) after the prestressed anchor rod part is constructed on the side wall of the foundation pit, hanging a reinforcing mesh under the working condition of the layer, and binding a waist beam;
(2) arranging phyllostachys pubescens with the length of 1.0-2.0 m and the interval of 0.5-1.0 m vertically between the reinforcing mesh and the waist beam along the direction of the waist beam, and firmly binding with the reinforcing steel bars of the waist beam and the reinforcing steel bars of the surface layer;
(3) installing a waist beam template, spraying a concrete surface layer and spraying a concrete waist beam;
(4) and (5) tensioning the prestressed anchor rod.
By adopting the technical scheme, the invention has the beneficial technical effects and advantages that:
the steel pipe, the channel steel, the flitch, the phyllostachys pubescens and other materials are arranged at the waist beam position of the soil nailing wall, and the force transfer bearing surface between the waist beam and the side wall of the foundation pit is enlarged, so that the rigidity of the side wall of the foundation pit is obviously improved, the function of the prestressed anchor rod is fully exerted, and the safety and deformation control of the foundation pit are fully guaranteed;
by adopting the method, the rigidity of the side wall of the foundation pit can be enhanced by replacing the micro pile, the construction is convenient and easy, the complicated construction process of forming holes, putting down I-shaped steel, steel pipes and the like the micro pile and then grouting is not needed, and the manufacturing cost is very low.
By adopting the method, the method can also be matched with the micro-piles for use, so that the number of the micro-piles is reduced, and the aims of increasing the safety of the foundation pit, reducing the manufacturing cost and accelerating the construction progress are fulfilled.
The composite soil nailing wall supporting structure with the local soft plastic soil body in the in-situ soil body of the foundation pit is optimal in scheme, and can embody the technical advantages and the economic advantages most
(1) The present invention is simple and easy to implement, and the present invention is further described in detail by the following embodiments in combination with the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a schematic view of a method of the present invention applied to a supporting structure of a soil nailing wall and a prestressed anchor;
FIG. 2 is a schematic diagram of the method of the present invention applied to a soil nailing wall + mixing pile + prestressed anchor structure;
FIG. 3 is a schematic view of the method of the present invention applied to a soil nailing wall + micro-pile + pre-stressed anchor structure;
FIG. 4 is a schematic view of the method of the present invention applied to a soil nailing wall + mixing pile + micro pile + pre-stressed anchor rod structure;
[ detailed description of the invention ]
Embodiment one, a construction method for reinforcing the rigidity of the side wall of a foundation pit by a composite soil nailing wall support, see figure 1,
1 is a net hanging and anchor spraying surface layer, 2 is a soil nail, 3 is a prestressed anchor rod, 4 is a waist beam, and 5 is a steel pipe, a channel steel, a flitch, a phyllostachys pubescens and other materials. The specific implementation mode is as follows: after foundation ditch side hanging reinforcing bar net 1, at waist rail 4 position, evenly arrange 5 materials such as steel pipe, channel-section steel, flitch, phyllostachys pubescens, press on reinforcing bar hanging net 1, then ligature waist rail reinforcing bar, make 5 be in between waist rail 4 and hanging net 1, when waist rail die filling and pouring accomplish, reach design intensity after, carry out stretch-draw to prestressed anchorage pole 3, enlarge the stress surface that the waist rail acted on the soil body through 5 to the efficiency of full play prestressed anchorage pole, restrict the foundation ditch deformation, improve the security of foundation ditch.
Example two, a construction method for reinforcing the rigidity of the side wall of the foundation pit by a composite soil nailing wall support, as shown in figure 2,
1 is a net hanging and anchor spraying surface layer, 2 is soil nails, 3 is a prestressed anchor rod, 4 is a waist beam, 5 is a steel pipe, a channel steel, a flitch, a phyllostachys pubescens and other materials, and 6 is a mixing pile. The specific implementation mode is as follows: after foundation ditch side hanging reinforcing bar net 1, at waist rail 4 position, evenly arrange 5 materials such as steel pipe, channel-section steel, flitch, phyllostachys pubescens, press on reinforcing bar hanging net 1, then ligature waist rail reinforcing bar, make 5 be in between waist rail 4 and hanging net 1, when waist rail die filling and pouring accomplish, reach design intensity after, carry out stretch-draw to prestressed anchorage pole 3, enlarge the stress surface that the waist rail acted on the soil body through 5 to the efficiency of full play prestressed anchorage pole, restrict the foundation ditch deformation, improve the security of foundation ditch. In the case, the stirring piles are added on the basis of the first embodiment, and the construction method is also applicable;
example three, a construction method for reinforcing the rigidity of the side wall of a foundation pit by a composite soil nailing wall support, which is shown in figure 3,
1 is a net hanging and anchor spraying surface layer, 2 is soil nails, 3 is a prestressed anchor rod, 4 is a waist beam, 5 is a steel pipe, a channel steel, a flitch, a phyllostachys pubescens and other materials, and 7 is a miniature pile. The specific implementation mode is as follows: after foundation ditch side hanging reinforcing bar net 1, at waist rail 4 position, evenly arrange 5 materials such as steel pipe, channel-section steel, flitch, phyllostachys pubescens, press on reinforcing bar hanging net 1, then ligature waist rail reinforcing bar, make 5 be in between waist rail 4 and hanging net 1, when waist rail die filling and pouring accomplish, reach design intensity after, carry out stretch-draw to prestressed anchorage pole 3, enlarge the stress surface that the waist rail acted on the soil body through 5 to the efficiency of full play prestressed anchorage pole, restrict the foundation ditch deformation, improve the security of foundation ditch. In the case, the micro-piles are added on the basis of the first embodiment, and the construction method is also applicable;
example four, a construction method for reinforcing the rigidity of the side wall of a foundation pit by a composite soil nailing wall support, as shown in figure 4,
the construction method comprises the following steps of 1, 2, 3, 4, 5, 6 and 7, wherein the net hanging and anchor spraying surface layer is formed, the soil nails are formed, the prestressed anchor rods are formed, the waist beams are formed, the steel pipes, channel steel, battens, phyllostachys pubescens and other materials are formed, and the mixing piles are formed in the pile hanging and anchor spraying surface layer. The specific implementation mode is as follows: after foundation ditch side hanging reinforcing bar net 1, at waist rail 4 position, evenly arrange 5 materials such as steel pipe, channel-section steel, flitch, phyllostachys pubescens, press on reinforcing bar hanging net 1, then ligature waist rail reinforcing bar, make 5 be in between waist rail 4 and hanging net 1, when waist rail die filling and pouring accomplish, reach design intensity after, carry out stretch-draw to prestressed anchorage pole 3, enlarge the stress surface that the waist rail acted on the soil body through 5 to the efficiency of full play prestressed anchorage pole, restrict the foundation ditch deformation, improve the security of foundation ditch. In this case, the mixing pile and the micro pile are added on the basis of the first embodiment, and the construction method is also applicable.
Claims (4)
1. A construction method for reinforcing the rigidity of the side wall of a foundation pit by a composite soil nailing wall support comprises the following process steps:
(1) after the prestressed anchor rod part is constructed on the side wall of the foundation pit, hanging a reinforcing mesh under the working condition of the layer, and binding a waist beam;
(2) steel pipes with the length of 1.0-2.0 m and the spacing of 0.5-1.0 m are uniformly and vertically arranged between the reinforcing mesh and the waist beam along the direction of the waist beam, and are firmly bound or welded with the reinforcing steel bars of the waist beam and the reinforcing steel bars of the surface layer;
(3) installing a waist beam template, spraying a concrete surface layer and spraying a concrete waist beam;
(4) and (5) tensioning the prestressed anchor rod.
2. A construction method for reinforcing the rigidity of the side wall of a foundation pit by a composite soil nailing wall support comprises the following process steps:
(1) after the prestressed anchor rod part is constructed on the side wall of the foundation pit, hanging a reinforcing mesh under the working condition of the layer, and binding a waist beam;
(2) uniformly and vertically arranging channel steel with the length of 1.0-2.0 m and the spacing of 0.5-1.0 m between the reinforcing mesh and the wale along the wale direction, and firmly binding or welding the channel steel with wale reinforcing steel bars and surface layer reinforcing steel bars;
(3) installing a waist beam template, spraying a concrete surface layer and spraying a concrete waist beam;
(4) and (5) tensioning the prestressed anchor rod.
3. A construction method for reinforcing the rigidity of the side wall of a foundation pit by a composite soil nailing wall support comprises the following process steps:
(1) after the prestressed anchor rod part is constructed on the side wall of the foundation pit, hanging a reinforcing mesh under the working condition of the layer, and binding a waist beam;
(2) wood battens with the length of 1.0-2.0 m and the distance of 0.5-1.0 m are uniformly and vertically arranged between the reinforcing mesh and the waist beam along the direction of the waist beam, and are firmly bound or welded with the reinforcing steel bars of the waist beam and the reinforcing steel bars of the surface layer;
(3) installing a waist beam template, spraying a concrete surface layer and spraying a concrete waist beam;
(4) and (5) tensioning the prestressed anchor rod.
4. A construction method for reinforcing the rigidity of the side wall of a foundation pit by a composite soil nailing wall support comprises the following process steps:
(1) after the prestressed anchor rod part is constructed on the side wall of the foundation pit, hanging a reinforcing mesh under the working condition of the layer, and binding a waist beam;
(2) uniformly and vertically arranging phyllostachys pubescens with the length of 1.0-2.0 m and the interval of 0.5-1.0 m between the reinforcing mesh and the waist beam along the direction of the waist beam, and firmly binding or welding the phyllostachys pubescens with the reinforcing steel bars of the waist beam and the reinforcing steel bars of the surface layer;
(3) installing a waist beam template, spraying a concrete surface layer and spraying a concrete waist beam;
(4) and (5) tensioning the prestressed anchor rod.
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| CN108894242A (en) * | 2018-07-27 | 2018-11-27 | 上海中锦建设集团股份有限公司 | Prefabricated board and its cushion cap foundation fetal membrane construction method for cushion cap foundation fetal membrane |
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| CN201095770Y (en) * | 2007-09-06 | 2008-08-06 | 长业建设集团有限公司 | Embedded single-layer basement wooden pile composite brad wall structure |
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| CN202055249U (en) * | 2010-12-30 | 2011-11-30 | 江苏江中集团有限公司 | Shoring structure with combination of micro-pipe pile and composite soil nailing wall |
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