CN109372013B - Comprehensive pipe gallery on soft foundation filled with EPS (expandable polystyrene) mixed soil and construction method - Google Patents
Comprehensive pipe gallery on soft foundation filled with EPS (expandable polystyrene) mixed soil and construction method Download PDFInfo
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- CN109372013B CN109372013B CN201811247792.7A CN201811247792A CN109372013B CN 109372013 B CN109372013 B CN 109372013B CN 201811247792 A CN201811247792 A CN 201811247792A CN 109372013 B CN109372013 B CN 109372013B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/46—Foundations for supply conduits or other canals
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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Abstract
The invention discloses an EPS (expandable polystyrene) mixed soil construction technology and method for backfilling a comprehensive pipe gallery on a soft foundation. The vertical displacement of piping lane body can be restricted to the inner support structure who is connected with the steel sheet pile, finally backfills the foundation ditch with EPS mixture soil is whole. The EPS mixed soil disclosed by the invention has the advantages of small density, high strength, locally available materials and the like, so that the problem of sedimentation of the comprehensive pipe gallery can be effectively solved, and the problem of floating of the comprehensive pipe gallery can be effectively improved by the structure of the steel sheet pile. The invention has simple working procedure, short construction period and cost saving in solving the practical engineering problem, and can be widely applied to the engineering fields of civil engineering, traffic and the like.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to an EPS (expandable polystyrene) mixed soil construction technology and method for backfilling a comprehensive pipe gallery on a soft foundation.
Background
The utility tunnel is a tunnel space built underground in a city, integrates various engineering pipelines such as electric power, communication, gas, heat supply, water supply and drainage and is provided with a special access hole, a lifting hole and a monitoring system, implements unified planning, design, construction and management and is an important infrastructure for guaranteeing city operation. The urban underground comprehensive pipe gallery engineering has been developed over a hundred years abroad, abundant construction and construction technologies can be used for reference, and various infrastructure pipelines are intensively arranged in the pipe gallery, so that the existence of facilities such as cables, telegraph poles, high-voltage towers and the like in the urban near-ground space is reduced; meanwhile, when relevant system problems are processed, ground traffic is not influenced, unnecessary repeated excavation of the road surface is not needed, and utilization efficiency of urban roads is effectively improved. The utility tunnel belongs to one-off foundation pit excavation construction engineering, and the requirement to bearing capacity, deformation control (settlement etc.) of ground is fairly strict, and the destruction that can not cause because of foundation bearing capacity, deformation control are out of place will be immeasurable.
The patent 'comprehensive pipe gallery of soft soil foundation and construction method thereof (application number 201710674236.7)' discloses a construction method of a comprehensive pipe gallery of soft soil foundation, which is characterized in that a plurality of prestressed reinforced concrete pipe piles are arranged at the bottom of a pipe gallery body, each prestressed reinforced concrete pipe pile is arranged in soil at the bottom of the pipe gallery body, and a top pile head of each prestressed reinforced concrete pipe pile is fixedly connected with a bottom plate of the pipe gallery body. This utility tunnel of soft soil foundation and construction method thereof overcomes the settlement too big and the come-up problem of soft soil foundation pipe gallery that exists among the prior art, has avoided the utility tunnel inefficacy, has guaranteed utility tunnel's stability effectively, but its construction process is complicated, and the construction cycle is long, and the cost is high. In a city developing at a high speed, a comprehensive pipe gallery construction method with simple construction procedures and short construction period is urgently needed to be developed so as to reduce the influence of construction on the surrounding traffic environment.
Disclosure of Invention
The invention aims to provide an EPS (expandable polystyrene) mixed soil construction technology and method for backfilling a comprehensive pipe gallery on a soft foundation.
The technical scheme adopted by the invention is as follows:
a comprehensive pipe gallery on a soft foundation backfilled with EPS (expandable polystyrene) mixed soil comprises a pipe gallery body, steel plate piles are arranged on two sides of the pipe gallery body, an inner support structure is arranged at the top of each steel plate pile, and the inner support structure is tightly attached to a contact surface of a top plate of the pipe gallery; the top of steel sheet pile, be close to one side of piping lane body all sets up the steel and encloses the purlin, EPS soil mixture is backfilled to piping lane body bottom and upper portion, sets up a waterproof layer between the bottom plate of piping lane body and EPS soil mixture.
The inner support structure is arranged longitudinally along the tube lane.
And two ends of the inner support structure are detachably arranged on the steel purlin respectively.
The EPS mixed soil is prepared by mixing EPS particles, cement, soil and water in proportion, and the density range is 8-16g/cm3The unconfined compressive strength is 50-500 kPa.
The EPS mixed soil construction technology and method for backfilling the comprehensive pipe gallery on the soft foundation comprise the following steps:
1) steel sheet piles are driven into two sides of the pipe gallery body and are arranged longitudinally;
2) according to the construction condition, downwards excavating a certain depth at the bottom of the pipe gallery body;
3) backfilling EPS mixed soil;
4) placing a comprehensive pipe gallery, and arranging a waterproof layer between a bottom plate of the comprehensive pipe gallery and EPS (expandable polystyrene) mixed soil;
5) steel enclosing purlins are respectively arranged on the steel sheet piles on the two sides, and steel corbels are arranged below the steel enclosing purlins on the two sides;
6) an inner support structure is arranged above a top plate of the pipe gallery body in a clinging manner, the inner support structure is clinging to the contact surface of the top plate of the pipe gallery, and the inner support structure is longitudinally arranged along the pipe gallery;
7) and integrally backfilling EPS mixed soil in the foundation pit, maintaining the EPS mixed soil, and then constructing the pavement.
In the construction mode, the bottom of the pipe gallery is excavated to a certain depth (the specific depth is determined according to the construction condition), mechanical excavation is stopped when the distance is 30cm from the designed elevation, and manual excavation is adopted, so that disturbance to foundation soil is reduced.
An inner supporting structure is arranged at the top of the steel sheet pile, the inner supporting structure is tightly attached to the contact surface of the top plate of the pipe gallery, and the interval between the inner supporting structures is 5m (determined according to the construction condition).
And (3) integrally backfilling EPS mixed soil, spreading the filled soil layer by layer, and rolling and compacting.
As a further improvement of the invention, the steel sheet piles connected with the inner support structure are permanently left in the soil, and the steel sheet piles on the other two sides are recycled and reused after the EPS mixed soil is integrally backfilled.
As a further improvement of the invention, a waterproof layer can be arranged between the bottom plate of the pipe gallery and the EPS mixed soil, and the function of protecting the structure of the pipe gallery can be further realized.
As a further improvement of the invention, the steel bracket is arranged below the steel purlin, so that the steel purlin can be prevented from being bent and deformed due to overlong length.
The mass percentages of the EPS particles, the cement and the water to the dry soil are respectively 2-6%, 4-15% and 60-80%. The density range of the prepared EPS mixed soil is 8-16g/cm3The unconfined compressive strength is 50-500 kPa.
The EPS mixed soil is applied to backfilling of the bottom and the upper part of the pipe gallery for the first time, and the EPS mixed soil contains EPS foam particles with large damping ratio and has certain energy consumption and shock absorption effects; in addition, the EPS mixed soil is light in weight and high in strength (the light weight is caused by containing very light EPS foam particles, and the high strength is caused by containing cement), so that the pressure generated to the pipe gallery and the lateral steel sheet piles under the action of an earthquake is relatively small, and the stability of the EPS mixed soil can be ensured.
The EPS mixed soil has light weight, greatly reduces the load generated by the underlying soft soil foundation, can meet the requirement of bearing capacity without processing the soft foundation, and can greatly reduce the vertical settlement of the foundation soil.
The EPS mixed soil is lighter than common soil, and can reduce the uneven settlement of the road surface compared with backfilled common soil (when the common soil is backfilled, the settlement of the road surface above the pipe gallery is small, and the settlement of the road surface above the common backfilled soil is large, so that the problem of uneven settlement with small middle and large two sides is easily caused.
Compared with the common backfill soil, the fluidity of the EPS mixed soil can be adjusted by increasing water quantity, and the EPS mixed soil can be poured and constructed in a pumping pressure mode, is particularly suitable for backfilling irregular areas and ensures compactness; the rolling construction of common backfill soil is not needed, the construction of the road surface can be carried out by maintaining for 7 days after the pump pressure pouring construction, the construction period is greatly shortened, and simultaneously, the hydration effect of cement ensures that the EPS mixed soil has enough strength and meets the requirement of bearing capacity.
The backfilled EPS mixed soil can be prepared from local materials, can utilize waste materials of industrial construction, and accords with the concept of sustainable development.
According to the invention, the problem of upward floating of the pipe gallery is solved by adopting the internal support structure fixedly connected with the steel sheet pile, and the transverse fixation of the internal support structure can effectively prevent the vertical upward displacement of the pipe gallery body.
Has the advantages that:
compared with the prior art, the invention has the following advantages:
(1) the waterproof layer that sets up between utility tunnel bottom plate and the EPS soil mixture can effectively prolong the life of piping lane, guarantees utility tunnel's safety.
(2) The inner support structure of the steel sheet pile is tightly attached to the contact surface of the top plate of the pipe gallery, so that the stability of a foundation pit can be guaranteed, the vertical displacement of the pipe gallery can be limited, and the floating problem of the comprehensive pipe gallery can be well solved.
(3) The wholly backfilled EPS mixed soil is light and high in strength, and can slow down the damage of the earthquake load effect on the pipe gallery.
(4) The light weight of the EPS mixed soil can greatly reduce the load generated on the underlying foundation soil, and particularly can effectively reduce the surface deformation and uneven settlement when the underlying soft soil foundation is used.
(5) The construction process is simple, the construction period is short, and the construction cost is saved.
Drawings
FIG. 1: the cross section of the comprehensive pipe gallery is schematic after soil layer backfilling;
in the figure, 1 is EPS mixed soil, 2 is a soft soil foundation, 3 is a steel sheet pile, 4 is a comprehensive pipe gallery body, 5 is a steel purlin, 6 is an internal support structure, 7 is a steel corbel, and 8 is a waterproof layer;
FIG. 2: the construction area structure diagram of the comprehensive pipe gallery in the numerical model comprises two soil layers, wherein the upper layer is a clay layer, and the lower layer is a silt silty clay layer;
FIG. 3: the settlement change of the middle point of the top surface of the silty clay layer along with the time;
FIG. 4: settlement change at the midpoint of the road surface with time;
FIG. 5: the settlement of the road surface under the action of traffic load in the operation period.
Detailed Description
Example 1
A comprehensive pipe gallery on a soft foundation backfilled with EPS (expandable polystyrene) mixed soil comprises a pipe gallery body, steel plate piles are arranged on two sides of the pipe gallery body, an inner support structure is arranged at the tops of the steel plate piles, and the inner support structure is tightly attached to a contact surface of a top plate of the pipe gallery; the top of steel sheet pile, be close to one side of piping lane body all sets up the steel and enclose the purlin, EPS soil mixture is backfilled to piping lane body bottom and upper portion, sets up a waterproof layer between the bottom plate of piping lane body and EPS soil mixture, inner support structure along piping lane longitudinal arrangement, both ends set up with dismantling respectively in on the steel encloses the purlin.
The construction method comprises the following steps:
the method comprises the following steps: the method comprises the following steps of (1) defining the range of a foundation pit to be excavated at the position where a pipe gallery is planned in advance;
step two: the method comprises the following steps of driving steel sheet piles into two sides of a foundation pit to be excavated, excavating the foundation pit in the enclosure range of the steel sheet piles, excavating the bottom of a pipe gallery downwards to a certain depth, stopping mechanical excavation at a position 30cm away from a designed elevation, and reducing disturbance to foundation soil (the steel sheet piles can also be used as waterproof curtains, so that construction can be performed orderly).
Step three: and backfilling EPS mixed soil and maintaining for 7 days, wherein the formula of the backfilled EPS mixed soil in the embodiment is as follows: EPS particles,The mass percentages of the cement and the water and the dry soil are respectively 4 percent, 15 percent and 80 percent, and the density of the prepared EPS mixed soil is 8.5g/cm3The unconfined compressive strength was 240 kPa.
Step four: and paving a coiled material waterproof layer on the backfilled EPS mixed soil.
Step five: and placing the pipe gallery body above the EPS mixed soil.
Step six, arranging steel enclosing purlins on the steel sheet piles on the two sides respectively, and arranging steel corbels under the steel enclosing purlins on the two sides to avoid bending deformation of the steel enclosing purlins due to overlong steel enclosing purlins.
Step seven: hug closely in the top of piping lane roof and set up an inner support structure, this inner support structure can restrict the vertical displacement of piping lane to can guarantee the stability on steel sheet pile upper portion.
Step eight: the EPS mixed soil is backfilled in the foundation pit integrally, the EPS mixed soil is maintained,
step nine: and removing the redundant rigid sheet piles, and then constructing the pavement.
Compared with the common backfill soil, the fluidity of the EPS mixed soil can be adjusted by increasing water quantity, the EPS mixed soil can be poured and constructed in a pumping pressure mode, the EPS mixed soil is particularly suitable for backfilling irregular areas, the rolling construction of the common backfill soil is not needed, the construction of the road surface can be carried out after the maintenance for 7 days after the pumping pressure pouring construction, and the construction period is greatly shortened (the construction period of the common backfill soil is 10-30 d).
The following are numerical simulation results of the present invention:
as shown in fig. 2, the soil layers of the comprehensive pipe gallery construction area in the numerical model are two layers, the upper layer is a clay layer, and the thickness is 5 m; the lower layer is a silty clay layer with a thickness of 10 m. The physical and mechanical parameters of the soil layer are shown in the table 1. And (3) contrastively analyzing the settlement of the roadbed and the road surface in the construction period and the operation period when the backfill soil respectively adopts common soil and EPS mixed soil. The construction period mainly considers the foundation pit backfilling process after the installation of the pipe gallery, two layers of backfilling are uniformly performed in the numerical simulation, each layer is backfilled for 7 days, the total time is 14 days, the pavement construction is performed after 7 days of maintenance are finished after the backfilling, and the construction period is 9 days. Then, in the operation period, the road traffic load is simulated by uniformly distributing static load of 20kPa, and the calculation time is 60 days.
TABLE 1 parameters of the soil layers in the model
The subgrade and pavement settlement comparative analysis of the foundation pit backfilled EPS mixed soil and the common soil is as follows:
(1) settlement change with time at midpoint of top surface of silty clay layer
Figure 3 is a graph of settling at the midpoint of the top surface of a silty clay layer as a function of time. It can be seen from the figure that the foundation has two stages of rapid settlement process no matter EPS mixed soil or common soil, and the time periods divided in the figure are foundation pit backfill (7 days +7 days), maintenance (7 days), pavement construction (9 days) and operation period (60 days) from left to right in sequence. The foundation pit backfill is divided into two layers, the backfill time of each layer is 7 days, and the construction maintenance is carried out after the foundation pit backfill is completed for 7 days. And after the maintenance is finished, constructing the pavement, wherein the construction period is 9 days. The operation period is 60 days from the 30 th day in the figure to the end of 90 days in the figure. As can be seen from the figure, under the action of road surface load, the settlement of the foundation pit backfilled by the EPS mixed soil has no obvious change, and the settlement tends to be smooth. For the foundation pit backfilled by the common soil, the settlement of the two backfilling stages is obviously greater than that of the EPS mixed soil backfilling stage, and the settlement tends to be gentle in the action stage of road surface load. Obviously, backfilling ordinary soil causes settlement of the underlying soil layer much greater than backfilling EPS mixed soil.
(2) Change in settlement over time at the midpoint of a road surface
FIG. 4 is a graph of the time-dependent change in settlement at the midpoint of the road surface after the road construction is completed and during the operation period. As can be seen from the graph, the settlement amount at the middle point of the road surface 35 days before the backfilling of the two different materials is obviously changed along with the time within the period of 60 days when the road surface is loaded. In the next 25 days, the settlement at the midpoint of the road surface tends to be gentle regardless of the EPS mixed soil or the ordinary backfill soil. Meanwhile, by comparing curves corresponding to two different backfill materials in the graph, the settlement of the backfill soil, which is common soil, in different time periods is obviously greater than that caused by backfilling EPS mixed soil.
(3) Road surface settlement during operation
FIG. 5 is a graph of road surface settlement profiles 5, 15, 30 and 60 days after entering the run period. As shown in the figure, the width of the foundation pit is 8m, and the distance between the middle position and the left steel sheet pile is 4 m. According to the graph, whether the EPS mixed soil or the common backfilled soil is adopted, the settlement of two sides of the foundation pit is larger than that of the middle position, the settlement caused by backfilling the common soil in each time period is larger than that caused by backfilling the EPS mixed soil, and in addition, the differential settlement between the road center above an EPS mixed soil backfilling area and the road shoulder is smaller than that of the common soil.
Claims (5)
1. A comprehensive pipe gallery on a soft foundation backfilled with EPS (expandable polystyrene) mixed soil comprises a pipe gallery body and is characterized in that steel plate piles are arranged on two sides of the pipe gallery body, an inner supporting structure is arranged at the tops of the steel plate piles, and the inner supporting structure is tightly attached to a contact surface of a top plate of the pipe gallery; steel enclosing purlins are arranged on the top of the steel sheet pile and on one side close to the pipe gallery body, EPS (expandable polystyrene) mixed soil is backfilled at the bottom and the upper part of the pipe gallery body, and a waterproof layer is arranged between a bottom plate of the pipe gallery body and the EPS mixed soil; the inner support structure is arranged longitudinally along the pipe gallery; the EPS mixed soil is prepared by mixing EPS particles, cement, soil and water in proportion, and the density range is 8-16g/cm3The unconfined compressive strength is 50-500 kPa.
2. The utility model provides a comprehensive pipe gallery on soft ground of backfill EPS misch metal, characterized by, both ends of inner support structure set up on the steel purlin detachably respectively according to claim 1.
3. The upper comprehensive pipe gallery of the soft foundation backfilled with EPS (expandable polystyrene) mixed soil of claim 1, wherein a steel corbel is arranged below the steel purlin.
4. The comprehensive pipe gallery on the soft foundation backfilled with the EPS mixed soil of claim 1, wherein the mass percentages of the EPS particles, the cement and the water in the EPS mixed soil and the dry soil are respectively 2% -6%, 4% -15% and 60% -80%.
5. The construction method of the utility tunnel on the soft foundation backfilled with the EPS mixed soil according to any one of claims 1 to 4, characterized by comprising the steps of:
1) steel sheet piles are driven into two sides of the pipe gallery body and are arranged longitudinally;
2) according to the construction condition, downwards excavating a certain depth at the bottom of the pipe gallery body;
3) backfilling EPS mixed soil;
4) placing a comprehensive pipe gallery, and arranging a waterproof layer between a bottom plate of the comprehensive pipe gallery and EPS (expandable polystyrene) mixed soil;
5) steel enclosing purlins are respectively arranged on the steel sheet piles on the two sides, and steel corbels are arranged below the steel enclosing purlins on the two sides;
6) an inner support structure is arranged above a top plate of the pipe gallery body in a clinging manner, the inner support structure is clinging to the contact surface of the top plate of the pipe gallery, and the inner support structure is longitudinally arranged along the pipe gallery;
7) and integrally backfilling EPS mixed soil in the foundation pit, maintaining the EPS mixed soil, and then constructing the pavement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811247792.7A CN109372013B (en) | 2018-10-25 | 2018-10-25 | Comprehensive pipe gallery on soft foundation filled with EPS (expandable polystyrene) mixed soil and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811247792.7A CN109372013B (en) | 2018-10-25 | 2018-10-25 | Comprehensive pipe gallery on soft foundation filled with EPS (expandable polystyrene) mixed soil and construction method |
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| CN109372013B true CN109372013B (en) | 2021-06-04 |
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| CN110241863B (en) * | 2019-07-06 | 2024-04-16 | 福建省水利水电勘测设计研究院有限公司 | Soft soil foundation pit excavation process pipe gallery deformation control device and control method thereof |
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| US6764250B2 (en) * | 2002-05-22 | 2004-07-20 | Hanjin Heavy Industries & Construction Co., Ltd. | Method of load reduction on buried culvert using EPS block and/or geosynthetics |
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| JPH06212619A (en) * | 1993-01-18 | 1994-08-02 | Tenox Corp | Foundation improving body |
| CN103952986A (en) * | 2014-05-19 | 2014-07-30 | 中国地质大学（武汉） | Load-shedding type rigid culvert structure |
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