CN212336037U - Novel foundation pit supporting structure - Google Patents
Novel foundation pit supporting structure Download PDFInfo
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- CN212336037U CN212336037U CN202020288554.7U CN202020288554U CN212336037U CN 212336037 U CN212336037 U CN 212336037U CN 202020288554 U CN202020288554 U CN 202020288554U CN 212336037 U CN212336037 U CN 212336037U
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Abstract
The utility model discloses a novel foundation pit supporting structure, enclose the purlin including continuous steel sheet pile, the I-steel, the anchor backing plate, ground tackle and anchor rope, continuous steel sheet pile is the slot steel sheet, slot cross sectional shape on the continuous steel sheet pile is trapezoidal, the I-steel encloses the purlin and is equipped with two and is fixed in the upper and lower both sides of continuous steel sheet pile respectively, the anchor backing plate straddles and is fixed in the I-steel and encloses between the purlin, the one end of anchor rope is fixed in through the grout and in stabilizing soil layer and the other end pass after the continuous steel sheet pile wear out in the space of reserving between the purlin from the I-steel, the tip of anchor rope is worn out and is fixed in on the ground tackle. The supporting structure changes the section shape of the steel sheet pile, can reduce the resistance when the steel sheet pile is driven in, can reduce the soil carrying amount when the steel sheet pile is pulled out, and reduces the influence on the surrounding environment.
Description
Technical Field
The utility model relates to a building excavation supporting technology field, concretely relates to novel excavation supporting construction.
Background
The foundation pit engineering is to excavate an underground space from the ground downwards, a vertical retaining enclosure structure is generally arranged around a deep foundation pit, and the enclosure structure is generally a plate wall structure with a certain insertion depth below the foundation of an excavation surface; the plate wall has cantilever type, single support type and multi-support type. The supporting structure is divided into an inner support and an outer anchor for reducing the deformation of the enclosure structure and controlling the bending moment of a wall body.
The method is widely applied to the fields of piling, ground wire continuous walls, gravity type retaining walls, soil nailing walls, combination forms of the structures and the like. The steel sheet pile is the most widely used one in the row pile, and its intensity is high, and the connection between stake and the stake is inseparable, and water proof effect is good, has the construction flexibility, and advantages such as sheet pile repeatedly usable are a soil retaining structure that the foundation ditch is commonly used. However, the existing steel sheet piles mostly adopt steel sheets with U-shaped sections, which have large resistance and can squeeze soil when being driven into the ground, and the steel sheets can take the soil out when being pulled out, so that gaps are formed at the positions of the steel sheet piles, which can affect the surrounding environment to a certain extent.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve above-mentioned problem, designed a novel excavation supporting construction, this supporting construction has changed the cross sectional shape of steel sheet pile, can reduce the resistance when squeezing into the steel sheet pile, and reducible area soil volume when extracting the steel sheet pile, reduces the influence to the surrounding environment.
In order to solve the technical problem, the above technical effect is achieved, the utility model discloses a following technical scheme realizes:
the utility model provides a novel foundation pit supporting construction, a serial communication port, including continuous steel sheet pile, the I-steel encloses the purlin, the anchor backing plate, ground tackle and anchor rope, continuous steel sheet pile is the slot steel sheet, slot cross sectional shape on the continuous steel sheet pile is trapezoidal, the I-steel encloses the purlin and is equipped with two and is fixed in the upper and lower both sides of continuous steel sheet pile respectively, the anchor backing plate straddles and is fixed in between the I-steel encloses the purlin, the one end of anchor rope is fixed in through the grout and wear out in the space of reserving between the I-steel encloses the purlin after the other end passes continuous steel sheet pile, the tip of anchor rope is through the anchor backing plate, wear out in the ground tackle.
The utility model has the advantages that: the supporting structure changes the section shape of the steel sheet pile, can reduce the resistance when the steel sheet pile is driven in, can reduce the soil carrying amount when the steel sheet pile is pulled out, and reduces the influence on the surrounding environment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of an assembly structure of a novel foundation pit supporting structure;
FIG. 2 is a schematic view of an anchoring structure of the novel foundation pit supporting structure;
fig. 3 is a schematic sectional structure view of the continuous steel sheet pile.
In the drawings, the components represented by the respective reference numerals are listed below:
1-continuous steel sheet pile, 2-I-steel purlin, 3-anchor backing plate, 4-anchor, 5-anchor cable, 6-cement paste and 7-groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-3, a novel foundation pit supporting structure, including continuous steel sheet pile 1, I-steel encloses purlin 2, anchor backing plate 3, ground tackle 4 and anchor rope 5, continuous steel sheet pile 1 is the slot steel sheet, slot 7 cross-sectional shape on the continuous steel sheet pile 1 is trapezoidal, I-steel encloses purlin 2 and is equipped with two and is fixed in the upper and lower both sides of continuous steel sheet pile 1 respectively, anchor backing plate 3 straddles and is fixed in between I-steel encloses purlin 2, the one end of anchor rope 5 is fixed in stabilizing the soil layer through grout 6 and the other end passes through in the continuous steel sheet pile 1 and wears out from the space of reserving between I-steel encloses purlin 2, the tip of anchor rope 5 wears out and is fixed in ground tackle 4 through anchor backing plate 3, ground tackle 4.
The concrete application of this supporting construction does: 1. and (3) the continuous steel sheet piles 1 are pressed into the foundation pit by using a static pile press, and the grooves of two adjacent continuous steel sheet piles 1 are buckled with each other to achieve the aim of water prevention. 2. After 1 construction of continuous steel sheet pile finishes, use the rig to bore and get the anchor eye, utilize the crane to be located geological drilling rig in the first row of anchor rope operation platform, the adjustment is measured drilling position and rig inclination, utilize the fastener to be fixed in on operation platform and the rock face, construct from bottom to top, along with the progress of drilling, in time erect one deck operation platform, drilling technology is: positioning → drilling → high pressure air cleaning. The bore diameter of the anchor cable is 130mm, mechanical drilling is adopted, the depth of a drilling hole is ensured to meet the design requirement, and water-jet drilling is strictly forbidden. If the stratum is loose, broken and easy to collapse, a pipe following drilling technology is adopted; and if the hole is collapsed, stopping drilling immediately, grouting and fixing the wall under the pressure of 0.1-0.2 MPa, and sweeping the hole again after initial setting for drilling. After drilling is finished, high-pressure air is used for cleaning holes, and rock powder and accumulated water in the holes are removed. And (3) rechecking the hole depth by using a polyethylene pipe, and when the hole depth is not less than the designed length of the anchor cable, pulling out the polyethylene pipe, and filling the hole opening with fabric or cement bag paper for later use. 3. Before installing the cable in the anchor cable hole, whether the anchor cable number is consistent with the hole number or not needs to be checked, and after the anchor cable number is confirmed to be correct, the anchor cable can be installed by cleaning the hole with high-pressure air once. When installing the anchor cable, the following four points are required: checking and positioning the positions of the slurry stopping and limiting rings, and replacing the damaged slurry stopping and limiting rings according to the technical requirements; checking the position and the smooth condition of the exhaust pipe; thirdly, feeding the anchor cable into the hole, stopping pushing when the positioning grout stopping ring reaches the orifice, and installing a grouting pipe and a one-way door; fourthly, after the anchor cable is in place, checking whether the exhaust pipe is unblocked again, if not, pulling out the anchor cable, and sending the cable again after the fault is eliminated. 4. Grouting anchor cables by adopting hole bottom grouting construction, injecting mortar from the hole bottom, exhausting air from exhaust holes, and controlling grouting positions by adopting a mortar position indicator. Grouting the anchor cable holes by using a grouting machine, wherein the grouting material is M40 cement mortar, the mixing ratio is determined by tests, and the grouting pressure is not lower than 0.6-0.8 Mpa; and (3) fully and compactly pouring the mortar, and after the first pouring is finished and the cement mortar is solidified and contracted, the opening of the hole is subjected to grout supplementation. 5. The anchor backing plate 3 is a compression member which transfers the concentrated load of the anchor 4 to the rock face, and in addition, the rock face of the hole is not vertical to the axis of the anchor cable 5 under normal conditions, so the anchor backing plate 3 also has the function of adjusting the stress direction of the rock face. In order to enable the upper surface of the anchor backing plate 3 to be perpendicular to the axis of the anchor cable, a thin-wall steel pipe with the outer diameter being the same as the diameter of the drill bit and the backing plate are welded in an orthogonal mode in advance, and the other end of the steel pipe is inserted into a drilled hole before the anchor backing plate 3 is poured. 6. The anchor cable is tensioned step by step twice, the first tensioning is 70% of the total tensioning force, and the interval time between two times of tensioning is preferably not less than 3-5 days. In order to reduce the prestress loss, the total tension force comprises an over-tension value, wherein the over-tension value is preferably 15-25% when the free section is a soil layer, and is preferably 10-15% when the free section is a rock layer. And (4) recording the stress applied to the extension of the anchor cable 5 in the tensioning process, and verifying whether the extension is consistent with the stress. The tension of each stage is gradually increased by 25% times for the design tension, the interval time of each stage is 2-5 minutes, and the interval time of the last stage is 30 minutes. In order to overcome the prestress loss caused by factors such as stratum creep, one-time supplementary tensioning is carried out, then locking is carried out, redundant steel strands are cut off, and the anchor is sealed by concrete. 7. And the grouting pipe is inserted from the reserved hole until the pipe orifice enters the top surface of the anchoring section for grouting by about 50 cm. Air in the hole is exhausted through an exhaust pipe arranged at the position of the positioning grout stop ring, after hole sealing and grouting, 50mm steel strands are reserved from the anchorage device, the rest part is cut off, and a C30 concrete anchor with the thickness not less than 50mm is coated outside the hole.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (1)
1. The utility model provides a novel foundation pit supporting structure, a serial communication port, including continuous steel sheet pile (1), I-steel encloses purlin (2), anchor backing plate (3), ground tackle (4) and anchor rope (5), continuous steel sheet pile (1) is the slot steel sheet, slot (7) cross sectional shape on continuous steel sheet pile (1) is trapezoidal, I-steel encloses purlin (2) and is equipped with two and is fixed in the upper and lower both sides of continuous steel sheet pile (1) respectively, anchor backing plate (3) are strideed and are fixed in between I-steel encloses purlin (2), the one end of anchor rope (5) is fixed in through grout (6) and the other end passes and wears out from the space of reserving between I-steel encloses purlin (2) after continuous steel sheet pile (1), the tip of anchor rope (5) is through anchor backing plate (3), wear out in ground tackle (4) and be fixed in ground tackle (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020288554.7U CN212336037U (en) | 2020-03-10 | 2020-03-10 | Novel foundation pit supporting structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020288554.7U CN212336037U (en) | 2020-03-10 | 2020-03-10 | Novel foundation pit supporting structure |
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| CN212336037U true CN212336037U (en) | 2021-01-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111236257A (en) * | 2020-03-10 | 2020-06-05 | 云南建投第一勘察设计有限公司 | Novel foundation pit supporting structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111236257A (en) * | 2020-03-10 | 2020-06-05 | 云南建投第一勘察设计有限公司 | Novel foundation pit supporting structure |
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