CN112942408A - Supporting and retaining structure for soft soil foundation road reconstruction and extension project and construction method - Google Patents
Supporting and retaining structure for soft soil foundation road reconstruction and extension project and construction method Download PDFInfo
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- CN112942408A CN112942408A CN202110127960.4A CN202110127960A CN112942408A CN 112942408 A CN112942408 A CN 112942408A CN 202110127960 A CN202110127960 A CN 202110127960A CN 112942408 A CN112942408 A CN 112942408A
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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
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0266—Retaining or protecting walls characterised by constructional features made up of preformed elements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/003—Foundations for pavings characterised by material or composition used, e.g. waste or recycled material
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
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- Environmental & Geological Engineering (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a supporting and retaining structure of soft soil foundation road reconstruction and extension engineering and a construction method, and the technical scheme is as follows: the reinforced retaining wall comprises a retaining wall panel for retaining a roadbed and reinforced strips for reinforcing the light filler, wherein the reinforced retaining wall comprises the retaining wall panel and the reinforced strips, and the reinforced strips are arranged at intervals along the height direction and the length direction of the retaining wall panel; the curtain shielding piles are arranged on one side of the retaining wall panel; the foundation pile is arranged on one side, away from the reinforced retaining wall, of the curtain pile and comprises a pipe pile for processing a part of widened foundation of the soft soil foundation and a reinforcing pile for reinforcing the foundation below the construction step; the light filling material comprises a foam light soil filling material arranged at the bottom of the roadbed, and a tire soil filling material is arranged above the foam light soil filling material. The method can solve the problems of overlarge differential settlement of the new roadbed and the old roadbed and overlarge lateral deformation of the new roadbed in the existing soft soil foundation reconstruction and extension project, and can realize the reasonable utilization of waste tires.
Description
Technical Field
The invention relates to the field of road reconstruction and extension projects, in particular to a supporting and retaining structure of a soft soil foundation road reconstruction and extension project and a construction method.
Background
The key technology of road expansion is how to reduce differential settlement of new and old road beds and reduce lateral deformation of the new road beds. In engineering construction, if a soft soil foundation is encountered, the bearing capacity is low, the deformation is easy, the engineering requirements are difficult to meet, and the foundation treatment is necessary. Two key problems to be solved in the soft soil foundation treatment are foundation deformation and foundation stability, the existing soft foundation road is expanded, mutual influence is inevitably generated between the new and old road beds, and the post-construction settlement control of the foundation is the core of the foundation treatment problems. Secondly, because of the weak nature of the soil property on the soft soil foundation, traditional gravity type barricade is difficult to be used for the soft soil foundation because of its dead weight is too big, and reinforced earth barricade is as light flexible retaining structure, can be used for the soft soil foundation, nevertheless often appears the great problem of lateral deformation in the operation process.
On the other hand, the pollution caused by the waste tires in the automobile industry has increasingly large influence on the environment, so that the waste tires can be applied to engineering construction, the pollution of the waste tires is reduced, the cost is saved for the engineering construction, and the method becomes important force for developing the circular economy, building the resource-saving society and the environment-friendly society in China. However, at present, the application form of the waste tires is single, mainly the application of the tire retaining wall is adopted, and the light weight and the anti-pulling property of the waste tires are not fully exerted.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a supporting and retaining structure for soft soil foundation road reconstruction and extension projects and a construction method, which can solve the problems of overlarge differential settlement of new and old roadbeds and overlarge lateral deformation of the new and old roadbeds in the existing soft soil foundation reconstruction and extension projects, and can realize the reasonable utilization of waste tires.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a supporting structure for a soft soil foundation road rebuilding and expansion project, including:
the reinforced retaining wall comprises a retaining wall panel for retaining a roadbed and reinforced strips for reinforcing the light filler, wherein the reinforced strips are arranged at intervals along the height direction and the length direction of the retaining wall panel;
the curtain shielding piles are arranged on one side of the retaining wall panel;
the foundation pile is arranged on one side, away from the reinforced retaining wall, of the curtain pile and comprises a pipe pile for processing a widened part of foundation of the soft soil foundation and a reinforcing pile for reinforcing the foundation below the construction step;
the light filling comprises a foam light soil filling arranged at the bottom of the roadbed, and a tire soil filling is arranged above the foam light soil filling.
As a further implementation, the retaining wall panel is composed of a plurality of panel blocks, and the panel blocks are provided with prefabricated grooves; one end of the reinforced strip is arranged in the prefabricated groove.
As a further implementation, the reinforcement strip is H-shaped, and the plurality of reinforcement strips are connected by a connecting member.
As a further implementation, the reinforcement strip is made of a waste tire material.
As a further implementation, the blind pile is parallel to the retaining wall panel, and the blind pile is through in length to widen the roadbed and the bottom of the blind pile is flush with the foundation pile.
As a further realization mode, the tire soil filler is formed by mixing tire fragments and sandy soil, and the particle size of the tire fragments is 3-6 cm.
As a further implementation manner, the reinforcing piles are CFG piles or plain concrete piles.
As a further implementation mode, the foamed light soil needs to be divided into construction areas longitudinally, and the length of one longitudinal construction area cannot exceed 20 m.
In a second aspect, an embodiment of the present invention further provides a construction method for a supporting structure of a soft soil foundation road rebuilding and expansion project, including:
(1) prefabricating a retaining wall panel of the reinforced retaining wall, a reinforced strip, a tubular pile and tire fragments of tire soil filler;
(2) leveling a field at the widened soft soil foundation, and excavating a groove with a set depth;
(3) excavating a construction step on the original roadbed side slope, wherein the width of the construction step is more than 2 m;
(4) mechanically drilling holes at the construction steps, and casting CFG piles or plain concrete piles in situ;
(5) constructing pile holes on the widened soft soil foundation, hoisting the prefabricated pipe piles by a crane, accurately inserting the piles into the foundation, and driving foundation piles; then, driving a curtain shielding pile, wherein the curtain shielding pile is positioned on the outermost side of the foundation pile;
(6) backfilling gravel materials at the widened soft soil foundation, leveling and compacting to meet the bearing capacity requirement, and covering a layer of impermeable geotextile on the surface of the backfill;
(7) pouring a bar-shaped foundation at the bottom of the reinforced retaining wall, and installing a first layer of retaining wall panel which is not reinforced;
(8) erecting a template according to the divided foam light soil pouring areas, and pouring foam light soil with a set height;
(9) installing the next layer of retaining wall panel, wherein the height of the next layer of retaining wall panel is the same as the height of the filling;
(10) backfilling a layer of tire soil filler within a set distance from the rear part of the retaining wall panel, backfilling common soil from the edge of the tire soil filler to the construction step of the original roadbed, and compacting the filler;
(11) stretching a layer of reinforcement strip on the surface of a layer of filler, and pressing the reinforcement strip at the groove of the panel building block;
(12) repeating the step (9) - (11), and filling the roadbed filling layer by layer from bottom to top until the installation of all the reinforced retaining walls is completed;
(13) and paving a pavement structure.
As a further implementation mode, after the reinforcement strip is pressed in the groove of the panel building block, mortar is used for pointing to fill the gap; the length of the reinforced strip band needs to penetrate through the tire soil filler and the common filler.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
(1) one or more embodiments of the invention comprehensively utilize the characteristics of retaining structures such as reinforced retaining walls, curtain piles and the like, can fully exert the effect of soil dispersing pressure, greatly reduce the lateral soil pressure borne by retaining wall panels, and can better solve the problem of overlarge lateral deformation of the traditional reinforced retaining walls.
(2) The blind pile of one or more embodiments of the invention simultaneously bears the functions of foundation treatment and dispersed soil filling pressure, the blind pile can simultaneously play the roles of soil arch effect and silo effect when bearing side soil pressure, the soil arch effect can fully adjust the shearing resistance of soil mass, and the soil pressure acting on a retaining wall panel is reduced; the silo effect makes the soil pressure not increase after certain degree of depth, and the laying of blind pile can effectively restrict the lateral deformation of newly-built roadbed.
(3) Compared with the traditional filler, the light filler adopted by one or more embodiments of the invention has light self weight, can greatly reduce the additional stress of the foundation, thereby reducing the settlement of the foundation, and achieves the purposes of better foundation treatment and elimination of uneven settlement of new and old roadbeds by matching with the foundation piles.
(4) The reinforced strip in one or more embodiments of the invention has better anti-pulling and anti-shearing performances, has a larger friction coefficient with the tire soil filler, can fully play the reinforcement effect of the reinforced strip, and simultaneously, the reinforced strip is made into an H shape, and the transverse ribs of the reinforced strip further enhance the pulling force with the filler.
(5) The waste tire reinforced strip and the tire soil fragments of one or more embodiments of the invention realize further utilization of waste tires in engineering construction, exert the light weight, the pulling resistance and the friction property of the tires, and achieve the purposes of solid waste utilization and environmental protection.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic block diagram of the present invention according to one or more embodiments;
FIG. 2 is a schematic illustration of a reinforcement strip in accordance with one or more embodiments of the present invention in connection with a face block;
FIG. 3 is a schematic representation of a ribbed belt structure according to one or more embodiments of the present disclosure;
wherein, 1, a strip foundation; 2. a retaining wall panel; 3. reinforcing the strip; 4. reinforcing piles; 5. a tubular pile; 6. a blind pile; 7. foam light soil filler; 8. filling soil in a common way; 9. a tire soil filler; 10. a panel block; 11. a cross rib; 12. a pin.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this application, if any, merely indicate that the directions of movement are consistent with those of the figures themselves, and are not limiting in structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting in this application.
The terms "mounted", "connected", "fixed", and the like in the present application should be understood broadly, and for example, the terms "mounted", "connected", and "fixed" may be fixedly connected, detachably connected, or integrated; the two components can be connected directly or indirectly through an intermediate medium, or the two components can be connected internally or in an interaction relationship, and the terms can be understood by those skilled in the art according to specific situations.
The first embodiment is as follows:
this embodiment provides a soft soil foundation road is reformed transform and is expanded engineering retaining structure, as shown in fig. 1, including reinforced retaining wall, blind pile 6, ground foundation pile and light filler, reinforced retaining wall sets up in newly-built road bed outside, and blind pile 6 link up and widen road bed and foundation, and the light filler is used for the wall back to backfill.
Further, the reinforced retaining wall comprises retaining wall panels 2 and reinforced strips 3, wherein the retaining wall panels 2 are vertically arranged and used for supporting and retaining a roadbed; the reinforcing strips 3 are used for light filler reinforcement. As shown in fig. 2, the retaining wall panel 2 is composed of a plurality of panel blocks 10, and the height of the retaining wall panel 2 is gradually raised as the filling height increases.
The prefabricated recess of panel building block 10 one end, 3 one ends of reinforcement strip are located in the prefabricated recess, a plurality of reinforcement strips 3 are arranged at prefabricated recess length direction interval.
The adjacent panel building blocks 10 are fixed through the prefabricated grooves and the bulges matched with the prefabricated grooves; meanwhile, the reinforced strip 3 is pressed in the prefabricated groove to realize fixation. In this embodiment, the panel block 10 is a rectangular parallelepiped block, and the size thereof can be determined according to a general design standard.
Further, as shown in fig. 3, the reinforcement strip 3 is an H-shaped structure, and includes two parallel longitudinal strips, and the two longitudinal strips are connected by a plurality of transverse ribs 11 distributed at intervals; the cross rib 11 is about 5cm long.
In this embodiment, the longitudinal strips are provided with pins 12, and the sections of the reinforcement strip 3 are connected by the pins 12. The connection length of the reinforced strip 3 is determined according to the requirement of an actual retaining structure. Of course, in other embodiments, the reinforcement strip 3 may be connected by other connectors.
In this embodiment, the reinforcement strip 3 is made of a waste tire material, and the reinforcement strip 3 is prefabricated before construction.
Further, the blind pile 6 is a precast tubular pile, which is arranged parallel to the retaining wall panel 2 and has a certain distance from the retaining wall panel 2. The cross section of the blind pile 6 is rectangular or circular, and the extension length of the bottom of the blind pile 6 is flush with the foundation pile so as to achieve the purpose of foundation treatment; the top of the curtain-covering pile 6 needs to reach the top of the embankment so as to achieve the purposes of exerting the soil arch effect and the silo effect.
In this embodiment, the blind piles 6 are located around 4m behind the retaining wall panel 2. Preferably, the blind studs 6 are circular in cross-section and have a cross-sectional diameter of 0.5-1 m.
The blind pile 6 of the embodiment penetrates through the roadbed and the foundation, and the foundation part of the blind pile and the foundation pile can play a role of treating the foundation together; the upper part of the blind pile penetrates to the top of the embankment, and when the blind pile bears lateral soil pressure, a soil arch effect and a silo effect can be generated, the shear strength of soil can be fully exerted by the soil arch effect, the lateral soil pressure is reduced, the silo effect enables the soil pressure not to be gradually increased along the depth, but basically keeps unchanged to a certain depth, and therefore the stress of the reinforced soil retaining wall rib belts and the panel can be greatly dispersed due to the curtain pile 6.
Further, the foundation piles comprise a plurality of tubular piles 5 for processing the widened part of the soft soil foundation and a plurality of reinforcing piles 4 for reinforcing the foundation below the excavated construction step, and the tubular piles 5 and the reinforcing piles 4 are sequentially arranged along the rear part of the curtain-covering pile 6; the size and the spacing of the piles, the construction method and the like can all refer to the current foundation treatment standard.
In this embodiment, the reinforcing pile 4 is a CFG pile (cement fly ash gravel pile) or a plain concrete pile 4.
Further, the light-weight filling material comprises a foam light-weight soil filling material 7 positioned at the bottom of the roadbed, and a tire soil filling material 9 positioned above the foam light-weight soil filling material 7 to the top of the roadbed. The backfill width of the light filler is a certain distance away from the retaining wall panel 2, and the light filler between the retaining wall panel 2 and the blind pile 6 needs to be compacted in a manual compaction mode.
In this embodiment, the tire soil filler 9 is backfilled to a width of 4m from the rear of the retaining wall panel 2 at the bottom, and then the backfilling distance is gradually widened along the slope of the common filler 8 at a ratio of 1: 1.5. It is understood that in other embodiments, the backfill distance of the bottom of the tire soil filler 9 and the gradient of the common filler 8 can be adjusted to other values according to the actual retaining requirements.
Further, the tire soil filler 9 is formed by mixing tire fragments and sandy soil, the particle size of the used tire fragments is about 3-6cm, the tire fragments are formed by crushing common waste tires in the market, the mass ratio of the tire fragments is 20%, and the density is 1100kg/m3The equivalent cohesive force is not less than 10kpa, and the internal friction angle is not less than 30 °. Preferably, the equivalent cohesion is 12kpa and the internal friction angle is 40 °.
In this embodiment, the thickness of the foamed lightweight soil filler 7 is 1m, a construction area needs to be divided in the longitudinal direction, and the length of the longitudinal construction area is about 10-15m and cannot exceed 20 m; the density of the foamed light soil is about 700-800 kg/m3. Preferably, one construction zone is divided every 12m in the longitudinal direction, and the density of the construction zone is about 700kg/m3And the 28d compressive strength needs to reach more than 2.3 MPa.
The light filler has small self weight, and can reduce the additional stress of a soft soil foundation, thereby achieving the purpose of reducing the settlement of a newly built roadbed; the side soil pressure generated by the tire soil filler 9 is smaller, and the friction with the reinforced strip 3 is more sufficient, so that the soil pressure can be further dispersed, the stress of the retaining wall panel is reduced, and the purpose of limiting the lateral deformation of the retaining wall is achieved. Therefore, the differential settlement of the new and old road beds and the lateral deformation of the new road bed can be effectively reduced when the embodiment is used for the soft soil foundation reconstruction and extension.
Example two:
the embodiment provides a construction method of a supporting and retaining structure of a soft soil foundation road reconstruction and extension project, which comprises the following steps:
step 1: each part is prefabricated before construction, and the middle tire fragment mainly comprises a panel building block 10, a reinforced strip 3, a tubular pile 5, a curtain shielding pile 6 and tire soil filler 9.
Step 2: and leveling the field at the widened soft soil foundation, and excavating a 50cm groove.
And step 3: a construction step is excavated on the original roadbed side slope, as shown in figure 1, wherein the width of the construction step is 2.5m, and the height of the construction step is 1.6 m.
And 4, step 4: and (3) mechanically drilling on the first layer of construction step and the second layer of construction step, and casting a CFG pile or a plain concrete pile in situ, wherein the section of the pile is circular, and the diameter of the pile is 0.8 m.
And 5: constructing pile holes on the widened soft soil foundation, paying off the pile positions, hoisting the precast tubular piles 5 by a crane, accurately inserting the piles into the designed positions of the foundation, hammering the precast tubular piles 5, and piling the foundation piles in combination with the step 4.
Step 6: and (5) driving the blind piles 6 according to the method shown in the step 5, wherein the blind piles 6 are positioned at the outermost sides of the foundation piles.
And 7: and backfilling gravel materials in the excavated groove for widening the soft soil foundation, leveling and compacting to meet the bearing capacity requirement, and covering a layer of impermeable geotextile on the surface of the backfill material.
And 8: pouring a bar-shaped foundation 1 at the bottom of the reinforced retaining wall, and installing a first layer of retaining wall panel 2, wherein the height of the first layer of retaining wall panel is 1m higher than the ground, and the panel of the first layer is not reinforced.
And step 9: and erecting a template according to the divided foam light soil pouring areas, pouring foam light soil with the height of 1m, and dividing the construction areas if the width of the widened cross section is more than 20m, or else, not dividing.
Step 10: and installing the next layer of retaining wall panel 2, wherein the height of the next layer of retaining wall panel is the same as the filling height.
Step 11: and backfilling a layer of tire soil filler 9 in 4m from the back of the retaining wall panel 2, backfilling common filling 8 from the edge of the tire soil filler 9 to the construction step of the original roadbed, wherein the slope rate of the common filling 8 is 1:1.5, and compacting the filler.
Step 12: and tensioning a layer of reinforcement strip 3 on the surface of a layer of filler, pressing the reinforcement strip 3 at the groove of the panel building block 10, and jointing with mortar to fill the gap. The length of the reinforced strip 3 needs to penetrate through the tire soil filler 9 and the common filler 8.
Step 13: and (5) repeating the steps 10 to 12, and filling the roadbed filling layer by layer from bottom to top until the installation of all the retaining wall panels 2 is completed.
Step 14: and paving a pavement structure.
Furthermore, a plurality of drain pipes are arranged at the height of every 2-4m, and the panel building block 10 needs to be perforated at the position where the drain pipes are arranged.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a soft soil foundation road rebuilds extension engineering fender structure which characterized in that includes:
the reinforced retaining wall comprises a retaining wall panel for retaining a roadbed and reinforced strips for reinforcing the light filler, wherein the reinforced strips are arranged at intervals along the height direction and the length direction of the retaining wall panel;
the curtain shielding piles are arranged on one side of the retaining wall panel;
the foundation pile is arranged on one side, away from the reinforced retaining wall, of the curtain pile and comprises a pipe pile for processing a widened part of foundation of the soft soil foundation and a reinforcing pile for reinforcing the foundation below the construction step;
the light filling comprises a foam light soil filling arranged at the bottom of the roadbed, and a tire soil filling is arranged above the foam light soil filling.
2. A soft soil foundation road rebuilding and expanding project retaining structure of claim 1, wherein the retaining wall panel is composed of a plurality of panel blocks, the panel blocks are provided with prefabricated grooves; one end of the reinforced strip is arranged in the prefabricated groove.
3. A soft soil foundation road rebuilding and expanding project retaining structure of claim 1 or 2, wherein the reinforcement strips are H-shaped, and a plurality of reinforcement strips are connected by connecting pieces.
4. A soft soil foundation road rebuilding and expanding project retaining structure of claim 1, wherein the reinforcement strip is made of waste tyre.
5. A soft soil foundation road rebuilding and expanding project retaining structure of claim 1, wherein said curtain-blocking pile is parallel to the retaining wall panel, the length of the curtain-blocking pile is through to widen the roadbed, and the bottom of the curtain-blocking pile is flush with the foundation pile.
6. A soft soil foundation road rebuilding and expanding project retaining structure of claim 1, wherein said tyre earth filler is made by mixing tyre fragments with sand, and the grain size of the used tyre fragments is 3-6 cm.
7. A soft soil foundation road rebuilding and expanding project retaining structure of claim 1, wherein the reinforcing pile is CFG pile or plain concrete pile.
8. A soft soil foundation road rebuilding and expanding project retaining structure of claim 1, wherein the foam light soil is divided into construction zones in longitudinal direction, and the length of one longitudinal construction zone can not exceed 20 m.
9. The construction method of the supporting and retaining structure of the soft soil foundation road rebuilding and expanding project according to any one of claims 1 to 8, characterized by comprising:
(1) prefabricating a retaining wall panel of the reinforced retaining wall, a reinforced strip, a tubular pile and tire fragments of tire soil filler;
(2) leveling a field at the widened soft soil foundation, and excavating a groove with a set depth;
(3) excavating a construction step on the original roadbed side slope, wherein the width of the construction step is more than 2 m;
(4) mechanically drilling holes at the construction steps, and casting CFG piles or plain concrete piles in situ;
(5) constructing pile holes on the widened soft soil foundation, hoisting the prefabricated pipe piles by a crane, accurately inserting the piles into the foundation, and driving foundation piles; then, driving a curtain shielding pile, wherein the curtain shielding pile is positioned on the outermost side of the foundation pile;
(6) backfilling gravel materials at the widened soft soil foundation, leveling and compacting to meet the bearing capacity requirement, and covering a layer of impermeable geotextile on the surface of the backfill;
(7) pouring a bar-shaped foundation at the bottom of the reinforced retaining wall, and installing a first layer of retaining wall panel which is not reinforced;
(8) erecting a template according to the divided foam light soil pouring areas, and pouring foam light soil with a set height;
(9) installing the next layer of retaining wall panel, wherein the height of the next layer of retaining wall panel is the same as the height of the filling;
(10) backfilling a layer of tire soil filler within a set distance from the rear part of the retaining wall panel, backfilling common soil from the edge of the tire soil filler to the construction step of the original roadbed, and compacting the filler;
(11) stretching a layer of reinforcement strip on the surface of a layer of filler, and pressing the reinforcement strip at the groove of the panel building block;
(12) repeating the step (9) - (11), and filling the roadbed filling layer by layer from bottom to top until the installation of all the reinforced retaining walls is completed;
(13) and paving a pavement structure.
10. A construction method of a supporting and retaining structure for a soft soil foundation road rebuilding and expanding project according to claim 9, characterized in that the reinforcement strip is pressed on the groove of the panel block, and then mortar pointing is adopted to fill the gap; the length of the reinforced strip band needs to penetrate through the tire soil filler and the common filler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110127960.4A CN112942408A (en) | 2021-01-29 | 2021-01-29 | Supporting and retaining structure for soft soil foundation road reconstruction and extension project and construction method |
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| CN202110127960.4A CN112942408A (en) | 2021-01-29 | 2021-01-29 | Supporting and retaining structure for soft soil foundation road reconstruction and extension project and construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114059424A (en) * | 2021-12-16 | 2022-02-18 | 陕西建工机械施工集团有限公司 | Limited space road widening construction method and assembly type foam concrete panel |
| CN114351758A (en) * | 2022-02-21 | 2022-04-15 | 山东省交通规划设计院集团有限公司 | Composite waste tire reinforced retaining wall structure and construction process thereof |
| CN114482600A (en) * | 2022-01-17 | 2022-05-13 | 中铁工程设计咨询集团有限公司 | Single-channel stress compensation type high-speed rail station widening structure and construction method thereof |
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| CN114059424A (en) * | 2021-12-16 | 2022-02-18 | 陕西建工机械施工集团有限公司 | Limited space road widening construction method and assembly type foam concrete panel |
| CN114482600A (en) * | 2022-01-17 | 2022-05-13 | 中铁工程设计咨询集团有限公司 | Single-channel stress compensation type high-speed rail station widening structure and construction method thereof |
| CN114351758A (en) * | 2022-02-21 | 2022-04-15 | 山东省交通规划设计院集团有限公司 | Composite waste tire reinforced retaining wall structure and construction process thereof |
| CN114351758B (en) * | 2022-02-21 | 2024-05-03 | 山东省交通规划设计院集团有限公司 | Composite type junked tire reinforced retaining wall structure and construction process thereof |
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