CN215252983U - Processing structure of utility tunnel soft foundation - Google Patents
Processing structure of utility tunnel soft foundation Download PDFInfo
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- CN215252983U CN215252983U CN202120167855.9U CN202120167855U CN215252983U CN 215252983 U CN215252983 U CN 215252983U CN 202120167855 U CN202120167855 U CN 202120167855U CN 215252983 U CN215252983 U CN 215252983U
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Abstract
The utility model discloses a processing structure of utility tunnel soft foundation belongs to utility tunnel technical field, has solved the problem that the cost is high, the period is long, technical requirement is high that traditional ground treatment scheme exists. The utility model discloses be equipped with the Larsen steel sheet pile respectively in utility tunnel's both sides, be equipped with respectively along Larsen steel sheet pile length direction's slip casting hole at every group Larsen steel sheet pile's side, be equipped with waterproof layer, reinforced concrete bed course, level sand stone layer and geotechnological cloth isolation and protection layer from top to bottom respectively in utility tunnel's bottom plate below. The utility model discloses simple structure, easy to carry out, it is lower to construction operation technical requirement, and can obviously reduce engineering cost, shorten the engineering time, the practicality is strong.
Description
Technical Field
The utility model belongs to the technical field of the utility model, concretely relates to processing structure of utility tunnel soft ground.
Background
In recent years, with the rapid development of cities and the continuous improvement of living standard of people, urban areas are enlarged increasingly, the population is increased rapidly, and the number of required underground pipelines is increased increasingly. For effectively utilizing the underground space, the planning construction of city utility tunnel is more and more. However, the comprehensive pipe gallery often encounters various complicated geological conditions with lengths of several kilometers and even dozens of kilometers, wherein the silty clay is a common soft foundation. If the treatment is not good, the utility tunnel is caused to sink, incline and leak water, even the pipeline inside the utility tunnel is broken, the normal operation of the city is endangered, and the consequence is very serious.
The traditional foundation treatment scheme generally adopts cement soil mixing piles or CFG pile composite foundations to reinforce soft foundations, and although the treatment effect is good, the construction cost is high, the construction period is long, and the technical requirement on construction operation is high. Therefore, a scheme for treating the soft foundation with convenient construction and low cost is urgently needed to solve the problems so as to ensure the safety of municipal pipelines in the comprehensive pipe gallery.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a processing structure of the soft ground of utility tunnel to solve the problem that the cost is high, the period is long, technical requirement is high that traditional ground treatment scheme exists.
The technical scheme of the utility model is that: the utility model provides a processing structure of utility tunnel soft foundation, is equipped with the Larsen steel sheet pile respectively in the both sides of utility tunnel, is equipped with respectively along the slip casting hole of Larsen steel sheet pile length direction at the side of every group Larsen steel sheet pile, is equipped with waterproof layer, reinforced concrete bed course, graded grit layer and geotechnological cloth isolation and protection layer from top to bottom respectively in the bottom plate below of utility tunnel.
As a further improvement, the geotextile isolation protective layer is laid upwards along the larsen steel sheet piles to a position higher than the waterproof layer.
As a further improvement, the grouting holes are located on the outer side of the Larsen steel plate pile back to the comprehensive pipe gallery, so that grouting is facilitated.
As a further improvement of the utility model, the distance between the grouting holes and the Larsen steel sheet piles is 15-20 cm.
As a further improvement, the utility model is provided with a supporting device between two groups of Larsen steel sheet piles.
As the utility model discloses a further improvement, strutting arrangement includes that steel bracket, steel enclose purlin and support steel pipe, and the steel bracket is equipped with many and just sets up along larsen steel sheet pile length direction, and every pair of steel bracket symmetry is established on two sets of larsen steel sheet piles, runs through on the steel bracket of every group larsen steel sheet pile and sets up the steel and enclose the purlin, supports the steel pipe and establishes between two sets of steel enclose purlins, supports the steel pipe and is equipped with many and encloses purlin length direction equipartitions along the steel.
As a further improvement of the utility model, the supporting device is provided with an upper layer and a lower layer.
As a further improvement of the utility model, the compaction coefficient of the graded sandstone layer is not less than 0.95.
The utility model has the advantages that: the utility model lays the graded gravel layer and the reinforced concrete cushion layer at the bottom of the foundation pit, thereby enhancing the strength of the top surface of the soft foundation; when water flows into the upper-level sand-stone layer from the original-state soft soil layer, water flows through the soil-stone layer by utilizing good air permeability and water permeability of the geotextile, so that soil particles, fine sand, small stones and the like are effectively intercepted, the disturbance to the original-state soft soil layer can be effectively reduced, and the stability of a soft soil foundation is kept; the geotextile has strong tensile strength, can enhance the tensile strength and the deformation resistance of a soil body, can prevent foundation soil from locally bulging, improves the quality of the soil body, reduces the settlement of the comprehensive pipe gallery at a deformation joint, and ensures the integral stability of the comprehensive pipe gallery; the reinforced concrete cushion layer is fully paved at the bottom of the foundation pit and plays a role in transversely supporting the Larsen steel sheet pile; and grouting is carried out in the grouting holes, so that the collapse of soft foundation soil can be prevented, and the overall stability of the soft foundation is ensured. Adopt pile foundation processing scheme for CFG stake etc, the utility model discloses needn't wait for the pile foundation to reach certain intensity, but save time. The utility model discloses simple structure, easy to carry out, it is lower to construction operation technical requirement, and can obviously reduce engineering cost, shorten the engineering time, the practicality is strong.
Drawings
FIG. 1 is a sectional configuration view of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a view showing the arrangement of grouting holes in the present invention;
fig. 4 is a sectional view of the utility tunnel after completion of construction.
In the figure: 1-undisturbed soft soil layer; 2-geotextile isolation protective layer; a 3-graded sandstone layer; 4-reinforced concrete cushion layer; 5-waterproof layer; 6-a bottom plate; 7-Larsen steel sheet piles; 8-supporting the steel pipe; 9-comprehensive pipe gallery; 10-steel purlin; 11-steel corbels; 12-a side wall; 13-grouting holes; 14-grouting body; 15-foundation pit backfill.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1-3, a processing structure of a flexible foundation of a utility tunnel is provided with Larsen steel sheet piles 7 on both sides of a utility tunnel 9, grouting holes 13 along the length direction of each Larsen steel sheet pile 7 are arranged on the side of each group of Larsen steel sheet piles 7, and a waterproof layer 5, a reinforced concrete cushion layer 4, a graded sand stone layer 3 and a geotextile isolation protective layer 2 are arranged below a bottom plate 6 of the utility tunnel 9 from top to bottom. The original soft soil layer 1 is arranged below the geotextile isolation protective layer 2.
And two sides of the geotextile isolation protective layer 2 are paved upwards to be higher than the waterproof layer 5 along the Larsen steel sheet pile 7.
The grouting holes 13 are located on the outer side, facing away from the comprehensive pipe gallery 9, of the Larsen steel sheet pile 7. The distance d between the grouting hole 13 and the Larsen steel sheet pile 7 is 15-20 cm.
And a supporting device is arranged between the two groups of Larsen steel sheet piles 7. Strutting arrangement includes steel bracket 11, steel purlin 10 and supports steel pipe 8, and steel bracket 11 is equipped with many pairs and sets up along the setting of 7 length direction of larsen steel sheet pile, and every pair of 11 symmetries of steel bracket establish on two sets of larsen steel sheet piles 7, runs through on the steel bracket 11 of every group larsen steel sheet pile 7 and sets up steel purlin 10, supports steel pipe 8 and establishes between two sets of steel purlins 10, supports steel pipe 8 and is equipped with many and encloses 10 length direction equipartitions of purlin along the steel. The supporting device is provided with an upper layer and a lower layer.
The compaction coefficient of the graded sandstone layer 3 is not less than 0.95.
The specification of the steel purlin 10 is 2HW150 multiplied by 150; the support steel pipe 8 has a specification of ∅ 299x 20.
During construction, firstly, the static pressure method is adopted for Larsen steel sheet pile 7 construction, then foundation pit excavation is carried out, the supporting device construction of the upper layer and the supporting device construction of the lower layer are carried out in sequence according to the excavation depth, when excavation is carried out to about 300mm above the elevation of the bottom of the foundation pit, manual excavation is adopted, and undisturbed soft soil layer 1 is prevented from being disturbed. When the foundation pit is manually excavated to the elevation of the bottom of the foundation pit, the geotextile isolation protective layer 2 is laid in time, and the two sides of the geotextile isolation protective layer are laid upwards to a certain height along the Larsen steel sheet pile 7; then laying a graded sandstone replacement filling layer 3, wherein the compaction coefficient is required to be not less than 0.95; and then pouring a reinforced concrete cushion layer 4, wherein two sides of the reinforced concrete cushion layer are tightly attached to the Larsen steel sheet piles 7.
After the reinforced concrete cushion layer 4 is constructed, a closed coiled material waterproof layer 5 is laid, the construction of a reinforced concrete bottom plate 6 and a side wall 12 of the comprehensive pipe gallery 9 is carried out in time, the backfill soil 15 of the foundation pit is backfilled in time after the concrete of the comprehensive pipe gallery 9 reaches the design strength and passes the acceptance of concealed engineering, the backfill is symmetrically backfilled and compacted at two sides of the comprehensive pipe gallery during backfilling, and the lower layer and the upper layer supporting devices are sequentially dismantled; after the foundation pit is backfilled, pulling out the Larsen steel sheet pile 7 in time, and requiring that two sides are symmetrically jumped and pulled simultaneously; in order to prevent gaps from being formed in the foundation due to the brought clay when the Larsen steel sheet pile 7 is pulled out, grouting holes 13 are formed according to the figure 3, cement slurry is injected to supplement the gaps, stable grouting bodies 14 are formed, grouting and pile pulling are carried out synchronously, the balance between the pile pulling speed and the grouting pressure is strictly controlled, and settlement monitoring measures are taken to ensure the overall stability of the foundation soil. The upper end of the grouting body 14 is higher than the bottom plate 6 by 1 m. The cross section of the comprehensive pipe gallery after construction is shown in figure 4.
According to the requirements of the technical specifications of urban comprehensive pipe gallery engineering (GB 50838-2015) and the technical specifications of underground engineering waterproofing (GB 50108-2008), the comprehensive pipe gallery is high in importance, the service life of the structural design is 100 years, and the safety level is one grade. Therefore, by comprehensively considering the factors, the construction quality of the comprehensive pipe gallery foundation treatment is strictly controlled on the basis of the standard requirement.
Claims (8)
1. The utility model provides a processing structure of utility tunnel soft foundation is equipped with Larsen steel sheet pile, its characterized in that respectively in utility tunnel's both sides: the side of each group of Larsen steel sheet piles (7) is respectively provided with a grouting hole (13) along the length direction of each Larsen steel sheet pile (7), and a waterproof layer (5), a reinforced concrete cushion layer (4), a graded sandstone layer (3) and a geotextile isolation protective layer (2) are respectively arranged below a bottom plate (6) of the comprehensive pipe gallery (9) from top to bottom.
2. The utility model provides a processing structure of utility tunnel soft foundation of claim 1 which characterized in that: and two sides of the geotextile isolation protective layer (2) are paved upwards to be higher than the waterproof layer (5) along the Larsen steel sheet pile (7).
3. A treatment structure of the soft foundation of the utility tunnel according to claim 1 or 2, characterized in that: and the grouting holes (13) are positioned on the outer side of the Larsen steel plate pile (7) facing away from the comprehensive pipe gallery (9).
4. The utility model provides a processing structure of utility tunnel soft foundation of claim 3 which characterized in that: the distance between the grouting holes (13) and the Larsen steel sheet piles (7) is 15-20 cm.
5. The utility model provides a processing structure of utility tunnel soft foundation of claim 4 which characterized in that: a supporting device is arranged between the two groups of Larsen steel sheet piles (7).
6. The utility model provides a processing structure of utility tunnel soft foundation of claim 5 which characterized in that: strutting arrangement includes steel bracket (11), steel purlin (10) and supports steel pipe (8), steel bracket (11) are equipped with many to and set up along larsen steel sheet pile (7) length direction, and every set up on two sets of larsen steel sheet piles (7) to steel bracket (11) symmetry, run through on steel bracket (11) of every group larsen steel sheet pile (7) and set up steel purlin (10), support steel pipe (8) and establish between two sets of steel purlin (10), support steel pipe (8) and be equipped with many and along steel purlin (10) length direction equipartitions.
7. The utility model provides a processing structure of utility tunnel soft foundation of claim 6 which characterized in that: the supporting device is provided with an upper layer and a lower layer.
8. The utility model provides a processing structure of utility tunnel soft foundation of claim 7 which characterized in that: the compaction coefficient of the graded sandstone layer (3) is not less than 0.95.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120167855.9U CN215252983U (en) | 2021-01-21 | 2021-01-21 | Processing structure of utility tunnel soft foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120167855.9U CN215252983U (en) | 2021-01-21 | 2021-01-21 | Processing structure of utility tunnel soft foundation |
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| Publication Number | Publication Date |
|---|---|
| CN215252983U true CN215252983U (en) | 2021-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120167855.9U Active CN215252983U (en) | 2021-01-21 | 2021-01-21 | Processing structure of utility tunnel soft foundation |
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| CN (1) | CN215252983U (en) |
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2021
- 2021-01-21 CN CN202120167855.9U patent/CN215252983U/en active Active
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