CN212898488U - Soil shaft's preface supporting construction system - Google Patents
Soil shaft's preface supporting construction system Download PDFInfo
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- CN212898488U CN212898488U CN202022050738.2U CN202022050738U CN212898488U CN 212898488 U CN212898488 U CN 212898488U CN 202022050738 U CN202022050738 U CN 202022050738U CN 212898488 U CN212898488 U CN 212898488U
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Abstract
The utility model discloses a preface supporting construction system of soil property shaft aims at providing that technical scheme is reliable, the construction is simple, and the investment is saved, can effectively realize the preface supporting construction system of separating of a soil property shaft of big section soil property shaft safety, high-efficient excavation. The structure system includes the shaft wall, advance support structure, construction period supporting construction and reinforced concrete well wall structure, advance support structure includes a plurality of slip casting steel-pipe piles that arrange around the shaft wall outside, construction period supporting construction includes reinforcing bar net piece, shaped steel walling crib, struts stock and shotcrete layer, and a plurality of shaped steel walling cribs are vertically evenly arranged along the inboard vertical wall of shaft wall to reinforcing bar net piece laying in the internal face of shaft wall, strut the stock and vertically evenly arrange with circumference along the shaft wall, and shaft wall internal face sets up and will seal reinforcing bar net piece, shaped steel walling crib and strut the stock and form holistic shotcrete layer, reinforced concrete well wall structure is pour in shotcrete in situ side.
Description
Technical Field
The utility model relates to a preface supporting construction system of soil property shaft is applicable to the construction of the relevant trade soil property shaft of basic building such as traffic, municipal administration, railway, water conservancy water and electricity.
Background
The excavation construction of the vertical shaft is a common construction procedure in the capital construction industry. In the excavation process of the soil shaft, the self-stability time of the soil body is short, the stability is poor, particularly, the safety and stability problems of the excavation construction process of the large-section soil shaft are not ignored, and engineering measures need to be taken pertinently.
SUMMERY OF THE UTILITY MODEL
The utility model relates to an overcome among the prior art system, soil body self-stability time is short, poor stability among the soil property shaft excavation process, has the weak point of great excavation construction safety stability problem, provides that technical scheme is reliable, the construction is simple, and the investment is saved, can effectively realize the branch preface supporting construction system of a soil property shaft of the safety of big section soil property shaft, high-efficient excavation.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model discloses a preface supporting construction system of soil shaft, including the shaft wall of excavation shaft, encircle the shaft wall outside and arrange advance support structure, encircle the construction period supporting construction that shaft wall inboard was arranged, and reinforced concrete well wall structure, advance support structure includes a plurality of slip casting steel-pipe piles that encircle the shaft wall outside and arrange, construction period supporting construction includes reinforcing bar net piece, shaped steel walling crib, support stock and shotcrete layer, and reinforcing bar net piece lays in the internal face of shaft wall, vertically evenly arranges a plurality of shaped steel walling cribs along shaft wall inboard, support stock is vertically and circumferentially evenly arranged along the shaft wall, support stock extends to the shaft outside along shaft radial direction, and shaft wall internal face sets up the shotcrete layer, and closed reinforcing bar net piece, shaped steel walling crib and support stock form wholly through the shotcrete layer, the reinforced concrete well wall structure is poured on the inner side surface of the concrete spraying layer.
And the grouting steel pipe pile is provided with an anti-seepage body through grouting.
And a locking well ring for connecting all the grouting steel pipe piles is arranged at the top of each grouting steel pipe pile.
And the grouting steel pipe pile extends downwards and inclines for 1-2 degrees towards the outer side of the shaft wall.
And the exposed section of the support anchor rod is welded with the reinforcing mesh and the profile steel walling crib.
And the concrete spraying layer forms an integral construction period supporting structure by the closed reinforcing mesh, the profile steel well ring and the supporting anchor rod.
Therefore, the utility model discloses following beneficial effect has:
(1) in the forepoling structure, a seepage hole is arranged in advance on a steel pipe pile body, pressure grouting is carried out on the steel pipe pile, cement paste can seep into surrounding soil bodies through the seepage hole to form a lapped continuous seepage-proof body, underground water is prevented from seeping and deteriorating soil body parameters, meanwhile, a drain hole construction procedure can be omitted, and work efficiency is improved. The steel pipe pile is grouted, and the rigidity and the strength of the pile body can be increased while seepage is prevented. The steel perforated pipes are connected into a whole through the locking well ring at the top of the grouting steel pipe pile, so that the integrity of the advance pre-supporting structure can be enhanced.
(2) In the construction period supporting structure, the exposed section of the supporting anchor rod is welded with the reinforcing mesh and the profile steel well ring, so that the integrity of the primary supporting structure is improved. The supporting anchor rods and the profile steel arch rings provide supporting resistance required by well wall construction period stability, and the overall stability of the well wall is guaranteed. The reinforcing bar net piece of well wall face is laid along excavation well wall face, prevents that the wall of a well soil body from producing the little piece that falls, guarantees the local stability of wall of a well surface layer. The support anchor rod, the reinforcing mesh and the profile steel well ring are integrated through the concrete spraying layer, and are cooperatively stressed to be jointly used as a support structure in the construction period of the vertical shaft.
(3) And finally constructing the reinforced concrete well wall structure to ensure the safety and stability of the well wall in the operation period. The safety and stability of the soil shaft in different construction stages are finally ensured through the sequential construction and the cooperative stress of the advanced support structure, the support structure in the construction period and the reinforced concrete shaft wall.
Drawings
Fig. 1 is a floor plan of a sequential support structure system of an earthen shaft of the present application.
FIG. 2 is a sectional view taken along line A-A of FIG. 1
The figure is marked with: 1. a shaft wall; 2. a reinforced concrete well wall structure; 3. grouting the steel pipe pile; 4. reinforcing mesh sheets; 5. a profile steel walling crib; 6. supporting an anchor rod; 7. spraying a concrete layer; 8. an impervious body; 9. a locking well ring; 10. a shaft; 11. and (4) soil body.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description.
As shown in fig. 1 and 2, the utility model discloses a preface supporting construction system of soil shaft, including the shaft wall 1 of excavation shaft 10, encircle the shaft wall 1 outside and arrange advance support structure, encircle the construction period supporting construction that 1 inboard of shaft wall was arranged and reinforced concrete shaft wall structure 2.
The advanced supporting structure comprises a plurality of grouting steel pipe piles 3 arranged around the outer side of the shaft wall 1. And seepage holes are preset in the pile body of the grouting steel pipe pile 3, and an anti-seepage body 8 is formed in the grouting steel pipe pile 3 through grouting. And a locking well ring 9 for connecting all grouting steel pipe piles 3 is arranged at the top of each grouting steel pipe pile 3. And the grouting steel pipe pile 3 extends downwards and inclines for 1-2 degrees towards the outer side of the shaft wall 1. The grouting steel pipe pile 3 serves as a advance support structure of a vertical shaft, provides a pre-support for the excavation of a well wall soil body, and ensures that the well wall is stable after the well wall is excavated and before the support is not constructed. The inclination angle of the grouting steel pipe pile 3 can effectively avoid the invasion of the steel pipe pile into an excavation surface caused by construction errors; the steel pipe pile body is perforated in advance, pressure grouting is carried out on the steel pipe pile, cement paste can permeate into surrounding soil 11 through the perforated hole to form a lapped continuous seepage-proofing body 8, underground water is prevented from permeating and deteriorating soil parameters, meanwhile, a drain hole construction procedure can be omitted, and work efficiency is improved.
Supporting construction includes reinforcing bar net piece 4, shaped steel walling crib 5, struts stock 6 and spouts concrete layer 7, and reinforcing bar net piece 4 is laid in the internal face of the shaft wall 1, along 1 inboard vertical evenly distributed a plurality of shaped steel walling cribs 5 of the shaft wall, strut stock 6 along 1 vertical and circumference evenly arranged of the shaft wall, strut stock 6 along the shaft radial direction to the shaft outside extend insert in the soil body 11. The exposed section of the support anchor rod 6 is welded with the reinforcing mesh 4 and the profile steel well ring 5, so that the integrity of the primary support structure is improved. The supporting anchor rod 6 and the profile steel arch ring provide supporting resistance required by the stability of the well wall in the construction period, and the overall stability of the well wall is ensured. The reinforcing bar net piece 4 of well wall face is laid along the excavation well wall face, prevents that the wall of a well soil body from producing little piece that falls, guarantees the local stability of wall of a well surface layer. The inner wall surface of the shaft wall 1 is provided with a concrete spraying layer 7, and a support anchor rod 6, a reinforcing mesh 4 and a profile steel well ring 5 form a whole through the concrete spraying layer 7, are stressed in a coordinated manner and are jointly used as a support structure in the shaft construction period.
And the reinforced concrete well wall structure 2 is poured on the inner side surface of the concrete spraying layer 7. And (3) constructing the reinforced concrete well wall structure 2 finally to ensure the safety and stability of the well wall in the operation period. The safety and stability of the soil shaft in different construction stages are finally ensured through the sequential construction and the cooperative stress of the advanced support structure, the support structure in the construction period and the reinforced concrete shaft wall.
The utility model discloses a soil property shaft's preface supporting construction, the construction method in its actual engineering includes following step:
The length of the grouting steel pipe pile 3 is determined according to the height of the well body and geological conditions, and the steel pipe pile can be lapped on the well body section. The grouting steel pipe pile 3 mainly plays a role in advance support, and generally adopts a pile diameter with a smaller cross section, so that the construction is convenient and the investment is saved. The pipe diameter and the distance of the steel pipe piles need to be comprehensively determined according to factors such as geological conditions, vertical shaft sections and well wall depth, the pipe diameter of the steel pipe piles is generally 60-200 mm, and the distance of the steel pipe piles is generally 300-1000 mm.
And 2, performing pressure grouting on the grouting steel pipe pile 3, wherein the cement paste can permeate into the surrounding soil body through the seepage holes to form a lapped continuous seepage-proofing body 8.
The mechanical parameters of soil bodies are prevented from being degraded by underground water infiltrating into an excavation surface, grouting pressure needs to be comprehensively determined according to soil layer properties, vertical shaft depth and the like, and the grouting pressure is generally 1-3 Mpa.
And 3, pouring concrete on the top of the grouting steel pipe pile 3 in situ to form a locking well ring 9, and connecting the steel pipe piles into a whole to complete construction of the advanced pre-support structure.
And 4, performing shaft excavation, sequentially performing construction of a support anchor rod 6, laying of the reinforcing mesh 4, mounting of the profile steel well ring 5 and construction of a concrete spraying layer 7 along with the layer, welding the exposed section of the support anchor rod 6 with the reinforcing mesh 4 and the profile steel well ring 5, and forming the support anchor rod 6, the reinforcing mesh 4 and the profile steel well ring 5 into an integral construction period support structure through the construction of the concrete spraying layer 7.
The vertical spacing of the profile steel well ring 5 needs to be matched with the vertical spacing of the support anchor rods 6.
And 5, adopting the reinforced concrete well wall structure 2 for in-situ concrete pouring construction, or adopting a prefabricated reinforced concrete well wall, and performing in-situ assembly construction if the prefabricated reinforced concrete well wall is adopted, and backfilling and grouting.
The technical scheme of the method ensures the safety and stability of the soil shaft in the construction period and the operation period through the synergistic effect of the advanced support structure, the support structure in the construction period and the reinforced concrete shaft wall structure 2 in the sequential construction.
Claims (6)
1. A sequential supporting structure system of a soil shaft is characterized by comprising a shaft wall of an excavation shaft, a forepoling structure arranged around the outer side of the shaft wall, a construction period supporting structure arranged around the inner side of the shaft wall and a reinforced concrete shaft wall structure, the advanced supporting structure comprises a plurality of grouting steel pipe piles arranged around the outer side of the vertical shaft wall, the supporting structure in the construction period comprises a reinforcing mesh, a profile steel well ring, a supporting anchor rod and a concrete spraying layer, the reinforcing mesh is laid on the inner wall surface of the vertical shaft wall, the profile steel well rings are uniformly arranged along the inner side of the vertical shaft wall in the longitudinal direction, the supporting anchor rods are evenly arranged along the vertical direction and the circumferential direction of the shaft wall, the supporting anchor rods extend to the outer side of the shaft along the radial direction of the shaft, the shaft wall is provided with a concrete spraying layer which is formed by sealing a reinforcing mesh, a profile steel well ring and the supporting anchor rods into a whole, and the reinforced concrete well wall structure is poured on the inner side surface of the concrete spraying layer.
2. The sequential supporting structure system of the soil shaft according to claim 1, wherein a seepage hole is preset in a pile body of the grouting steel pipe pile, and the grouting steel pipe pile forms an anti-seepage body through grouting.
3. The sequential supporting structure system of the soil shaft according to claim 1, wherein a locking well ring for connecting all the grouting steel pipe piles is arranged at the top of the grouting steel pipe piles.
4. The sequential supporting structure system of the soil shaft according to claim 1, wherein the grouting steel pipe piles extend downwards and incline to the outer side of the shaft wall by 1-2 degrees.
5. The sequential supporting structure system of the soil shaft according to claim 1, wherein the exposed section of the supporting anchor rod is welded with the steel bar net sheet and the section steel shaft ring.
6. The sequential supporting structure system of the soil shaft according to claim 1, wherein the concrete-sprayed layer forms an integral construction-period supporting structure by the closed reinforcing mesh, the section steel shaft ring and the supporting anchor rods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022050738.2U CN212898488U (en) | 2020-09-18 | 2020-09-18 | Soil shaft's preface supporting construction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022050738.2U CN212898488U (en) | 2020-09-18 | 2020-09-18 | Soil shaft's preface supporting construction system |
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| Publication Number | Publication Date |
|---|---|
| CN212898488U true CN212898488U (en) | 2021-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022050738.2U Active CN212898488U (en) | 2020-09-18 | 2020-09-18 | Soil shaft's preface supporting construction system |
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| Country | Link |
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| CN (1) | CN212898488U (en) |
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- 2020-09-18 CN CN202022050738.2U patent/CN212898488U/en active Active
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