CN108221528B - Roadbed building overlapping structure and construction method - Google Patents
Roadbed building overlapping structure and construction method Download PDFInfo
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- CN108221528B CN108221528B CN201810001129.2A CN201810001129A CN108221528B CN 108221528 B CN108221528 B CN 108221528B CN 201810001129 A CN201810001129 A CN 201810001129A CN 108221528 B CN108221528 B CN 108221528B
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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
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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Abstract
The invention provides a roadbed building lapping structure and a construction method, which relate to the technical field of roadbed filling construction in road engineering and comprise an existing concrete structure and a step-shaped foundation pit; the stepped foundation pit is arranged from the original surface downwards, and one side of the stepped foundation pit is in contact with the existing concrete structure; the echelonment foundation ditch includes: a plurality of sections of step planes and step slopes arranged from the original plane downwards; the step-shaped foundation pit is internally provided with a filling layer, the filling layer fills the step-shaped foundation pit to be flush with the original ground in the horizontal direction, and the filling layer is in contact with the existing concrete structure in the vertical direction, so that the technical problem of uneven settlement of a roadbed overlapping area in the prior art is solved.
Description
Technical Field
The invention relates to the field of roadbed filling construction in road engineering, in particular to a roadbed building overlapping structure and a construction method.
Background
In recent years, with the rapid development of economy and urban roads in China, the requirements on the quality of the urban roads, particularly roadbed filling, are higher and higher, if the roadbed filling quality is poor, a plurality of hidden dangers are left on the road surface and the roadbed, the service quality and the service life of the road surface are reduced, and serious damage to the roadbed or the road surface even interrupts traffic, so that great economic loss is caused. When the roadbed is filled and lapped with the existing concrete structure, how to avoid the uneven settlement of the lapping area of the roadbed is the key point of construction, if the control is not good, the uneven settlement of the lapping area of the roadbed is easily caused, so that the damage of the pavement structure is caused, the use of the road is influenced, and the danger is caused for driving.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a roadbed building overlapping structure and a construction method, which are used for relieving the technical problem of uneven settlement in a roadbed overlapping area in the prior art.
In a first aspect, the present invention provides a roadbed building overlapping structure, including: the existing concrete structure and the step-shaped foundation pit;
the stepped foundation pit is arranged from the original surface downwards, and one side of the stepped foundation pit is in contact with the existing concrete structure;
the echelonment foundation ditch includes: a plurality of sections of step planes and step slopes arranged from the original plane downwards;
and a filling layer is arranged in the stepped foundation pit, the stepped foundation pit is filled up to the position flush with the original ground by the filling layer in the horizontal direction, and the stepped foundation pit is in contact with the existing concrete structure in the vertical direction.
Further, the filling layer includes: a first geotextile;
the stepped plane includes: a pit bottom;
the first geotextile is laid on the pit bottom, and the first geotextile is fixed on the pit bottom by using anchoring nails.
Further, a medium-coarse sand layer is arranged on the first geotextile laid on the pit bottom.
Further, the stepped plane includes: a first stair-step plane;
after the middle coarse sand layer is laid, the middle coarse sand layer is flush with the first step plane;
and second geotextiles are laid on the first step plane and the medium coarse sand layer, and are fixed on the medium coarse sand layer by using anchoring nails.
And further, a high-quality soil layer is paved on the second geotextile.
Further, when the distance between the high-quality soil layer and the original ground is 20 cm-50 cm, a plain concrete layer is laid.
Further, the existing concrete structure includes: a crown beam;
and a reinforced concrete step platform is poured on the plain concrete layer.
Furthermore, a geogrid is laid on the step platform and connected through anchoring nails.
In a second aspect, the present invention provides a construction method, including: according to the roadbed building lap joint structure, a multi-stage step foundation pit is dug in sequence by adopting a multi-stage step type excavation method on the original ground on one side of an existing concrete structure;
laying geotextile in the first stage of stepped foundation pit to cover the foundation pit bottom and the first stage of stepped slope surface, wherein one end of the geotextile is connected with the existing concrete structure through a hook positioned at the height of the bottom surface of the foundation pit on the existing concrete, and the other end of the geotextile is remained;
after the first section of the stepped foundation pit is backfilled by medium coarse sand, the remaining part of the geotextile is reversely wrapped with backfill, and then the geotextile is connected with the existing concrete structure through a hook positioned at the height of the platform surface of the first section of the stepped foundation pit on the existing concrete;
then, laying geotextile in the second section of stepped foundation pit to cover the backfill material of the first section of stepped foundation pit, the first section of stepped platform surface and the second section of stepped slope surface, wherein one end of the geotextile is connected with the existing concrete structure through a hook positioned at the height of the first section of stepped platform surface on the existing concrete, and the other end of the geotextile is left;
after the second-section stepped foundation pit is backfilled by high-quality soil, the remaining part of the geotextile is reversely wrapped with backfill, and then the geotextile is connected with the existing concrete structure through a hook positioned at the height of the platform surface of the second-section stepped foundation pit on the existing concrete;
then, backfilling high-quality soil on each step by the same method;
and backfilling high-quality soil in the last section of the stepped foundation pit to a distance of 20-50 cm from the original ground, and then backfilling plain concrete to the height of the original ground.
Furthermore, step-shaped reinforced concrete is installed beside the existing concrete structure above the original ground, and then geogrids are laid after high-quality soil is backfilled to the step surface.
The roadbed building overlapping structure and the construction method provided by the invention have the following beneficial effects:
the invention provides a roadbed building lap joint structure which comprises a step-shaped foundation pit, wherein the step-shaped foundation pit comprises a plurality of steps which are arranged in a step shape from top to bottom; laying geotextile in each stage of foundation pit and wrapping backfill in each stage of foundation pit, wherein the geotextile ends are connected with the side wall of the existing concrete structure; backfilling the first stage of the stepped foundation pit by using medium coarse sand, backfilling the other stages of the stepped foundation pit by using high-quality soil, backfilling the high-quality soil in the last stage of the stepped foundation pit to a position 20-50 cm away from the original ground, and backfilling plain concrete to the original ground; step-shaped reinforced concrete is installed beside the existing concrete above the original ground, and then high-quality soil backfilled above the original ground is separated on each step by geogrids. The design is suitable for roadbed filling engineering needing to be lapped with the existing concrete structure in roadbed filling, the lapping quality of the roadbed and the existing concrete structure is guaranteed, the settlement condition of soil bodies around the existing concrete structure is improved, uneven settlement of a lapping area of the existing concrete structure is avoided, the service life of an earth surface road is prolonged, and the roadbed filling engineering has strong universality, good social benefits and good popularization and application prospects.
The construction method provided by the invention has all the advantages of the roadbed building overlapping structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic cross-sectional structure diagram of a reverse excavation foundation pit provided in an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure diagram of geotextile laying provided by the embodiment of the present invention;
FIG. 3 is a schematic cross-sectional structure diagram of a filling layer provided in an embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure above the ground according to an embodiment of the present invention.
Icon: 1-a step-shaped foundation pit; 121-a first geotextile; 122-a second geotextile; 101-pit bottom; 102-a stair-step plane; 1021-first step plane; 103-step slope; 2-the original ground; 3-existing concrete structure; 301-supporting piles; 302-a crown beam; 4-hooking; 6-anchoring nails; 7-medium coarse sand layer; 8-high-quality soil layer; 9-plain concrete layer; 10-a step platform; 11-geogrid; 12-filling layer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, a roadbed structure overlapping structure and a construction method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
In a first aspect, a roadbed building overlapping structure comprises: the existing concrete structure 3 and the stepped foundation pit 1;
the stepped foundation pit 1 is arranged from the original ground 2 downwards, and one side of the stepped foundation pit 1 is in contact with the existing concrete structure 3;
the stepped foundation pit 1 includes: a plurality of sections of step planes 102 and step slopes 103 are arranged downwards from the original ground 2;
a filling layer 12 is arranged in the stepped foundation pit 1, the stepped foundation pit 1 is filled to be flush with the original ground 2 by the filling layer 12 in the horizontal direction, and the stepped foundation pit is in contact with the existing concrete structure 3 in the vertical direction.
The roadbed building overlapping structure comprises a stepped foundation pit 1, wherein the stepped foundation pit 1 comprises a plurality of steps which are arranged in a stepped manner from top to bottom; geotextile is laid in each stage of foundation pit and backfill in each stage of foundation pit is wrapped, and the ends of the geotextile are connected with the side wall of the existing concrete structure 3; backfilling the first section of the stepped foundation pit by using medium coarse sand, backfilling the other sections of the stepped foundation pit by using high-quality soil, backfilling the high-quality soil in the last section of the stepped foundation pit to a distance of 220 cm-50 cm from the original ground, and backfilling plain concrete to the original ground 2; step-shaped reinforced concrete is installed beside the existing concrete above the original ground 2, and then high-quality soil backfilled above the original ground 2 is separated on each step by a geogrid 11. The design is suitable for roadbed filling engineering needing to be lapped with the existing concrete structure 3 in roadbed filling, the lapping quality of the roadbed filling with the existing concrete structure 3 is guaranteed, the settlement condition of the soil body at the periphery of the existing concrete structure 3 is improved, uneven settlement of the lapping area of the existing concrete structure 3 is avoided, the service life of the earth surface road is prolonged, and the roadbed filling engineering has strong universality, good social benefits and good popularization and application prospects.
Specifically, the original ground 22 on one side of the existing concrete structure 3 is reversely excavated, a multistage stepped excavation method is adopted to excavate multistage stepped foundation pits in sequence, the stepped foundation pit 1 comprises steps with multiple sections arranged in a stepped manner from top to bottom, and the step height-width ratio of the steps is 1: 1, the step width is more than or equal to 1m, and the inward transverse slope is 2-4 percent.
In addition, the filling layer 12 includes: a first geotextile 121;
the stepped plane 102 includes: a pit bottom 101;
the first geotextile 121 is laid on the pit bottom 101, and the first geotextile 121 is fixed on the pit bottom 101 by the anchor nails 6.
The existing concrete structure 3 includes: crown beam 302 and fender pile 301 two parts to, crown beam 302 sets up in the upper end of fender pile 301, and it is fixed with fender pile 301 to bore the inflation screw into fender pile 301, fixes couple 4 with the inflation screw again, guarantees that couple 4 fixes on fender pile 301, and 4 horizontal directions of couple are fixed one every 2 meters, and vertical direction is leveled with each ladder platform 10 face.
After the foundation pit bottom 101 is subjected to surface cleaning and bearing tests, a first geotextile 121 is laid in the first section of ladder foundation pit to cover the foundation pit bottom 101 and the first section of ladder slope surface 103, one end of the first geotextile 121 is connected with a hook 4 on the supporting pile 301 at the height of the foundation pit bottom 101, the first geotextile is fixed on the pit bottom 101 and the first section of ladder slope surface 103 by adopting an anchoring nail 6, and the other end of the first geotextile is left; the coarse sand layer 7 in the step backfilling is filled into the first section of the stepped foundation pit in a layered mode, 15-20 cm is one layer, the step is not limited in the step, and the thickness of the coarse sand layer 7 can be as follows: 15cm, 16cm, 17cm, 18cm, 19cm or 20cm, tamping by using a water-tamping plug-in vibrating rod after paving, reversely wrapping the remained part of the first geotextile 121 on the tamped medium-coarse sand layer 7, connecting the support pile 301 through the hook 4 positioned at the height of the 10 surface of the first section of the stepped platform on the support pile 301, and fixing the support pile on the medium-coarse sand layer 7 by using an anchoring nail 6.
In addition, the stepped plane 102 includes: a first stair plane 1021;
after the middle coarse sand layer 7 is laid, the middle coarse sand layer 7 is flush with the first step plane 1021;
the second geotextile 122 is laid on the first step plane 1021 and the medium-coarse sand layer 7, and the second geotextile 122 is fixed on the medium-coarse sand layer 7 by the anchoring nails 6.
Laying a second geotextile 122 in the second section of stepped foundation pit to cover the tamped medium coarse sand layer 7 in the first section of stepped foundation pit, the first stepped plane 1021 of the first section of stepped and the second stepped slope 103, wherein one end of the second geotextile 122 is connected with the hook 4 on the support pile 301 at the height of the first stepped plane 1021, and is fixed on the tamped medium coarse sand layer 7 in the first section of stepped foundation pit, the first stepped plane 1021 and the stepped slope 103 by adopting an anchoring nail 6, and the other end is left; and backfilling a high-quality soil layer 8 to a second section of stepped foundation pit in a layered manner, wherein the paving thickness of the backfilled high-quality soil layer 8 is 15-20 cm, the paving thickness of the high-quality soil layer 8 can be 15cm, 16cm, 17cm, 18cm, 19cm or 20cm, optionally compacting by using a medium-sized and small-sized road roller, reversely wrapping the remained part of the second geotextile 122 with the compacted high-quality soil layer 8, connecting the tamped high-quality soil layer with a support pile 301 through a hook 4 positioned at the height of the second section of stepped platform 10 on the support pile 301, and fixing the tamped high-quality soil layer 8 by using an anchoring nail 6.
Then, backfilling a high-quality soil layer 8 on each section of ladder by the same method, backfilling the high-quality soil layer 8 to 220-50 cm away from the original ground when backfilling the last section of ladder foundation pit, wherein the distance between the high-quality soil layer 8 and the original ground 2 can be 20cm, 30cm, 40cm or 50cm, and then backfilling a plain concrete layer 9 to the height of the original ground 2; after the plain concrete layer 9 reaches the strength, installing the template and the steel bars, connecting the steel bars with the crown beam 302 by adopting a bar planting method, wherein the poured reinforced concrete is step-shaped, and the step height-width ratio is 1: 2, the step width is more than or equal to 0.5 m.
After the reinforced concrete reaches the strength, roadbed filling above the original ground 2 is carried out, after high-quality soil layers 8 or water stabilizing materials are filled to the surface of a reinforced concrete stepped platform 10, geogrids 11 are laid and fixed by adopting anchoring nails 6, and then the next step of construction of the roadbed and the road surface is carried out.
In the second aspect, a construction method is that the original ground 2 at one side of the existing concrete structure 3 is excavated into multi-stage step foundation pits in sequence by adopting a multi-stage step excavation method;
laying geotextile in the first stage of stepped foundation pit to cover the foundation pit bottom 101 and the first stage of stepped slope 103, wherein one end of the geotextile is connected with the existing concrete structure 3 through a hook 4 positioned at the height of the foundation pit bottom 101 on the existing concrete, and the other end of the geotextile is remained;
after the first-section stepped foundation pit is backfilled by medium coarse sand, the remaining part of the geotextile is reversely wrapped by backfill, and then the geotextile is connected with the existing concrete structure 3 through a hook 4 which is positioned at the height of the first-section stepped platform 10 surface on the existing concrete;
then, laying geotextile in the second section of stepped foundation pit to cover the backfill material of the first section of stepped foundation pit, the 10 surface of the first section of stepped platform and the second section of stepped slope 103, wherein one end of the geotextile is connected with the existing concrete structure 3 through a hook 4 which is positioned at the height of the 10 surface of the first section of stepped platform on the existing concrete, and the other end of the geotextile is left;
after the second-section stepped foundation pit is backfilled by high-quality soil, the remaining part of the geotextile is reversely wrapped with backfill, and then the geotextile is connected with the existing concrete structure 3 through a hook 4 which is positioned at the height of the surface 10 of the second-section stepped platform on the existing concrete;
then, backfilling high-quality soil on each step by the same method;
and backfilling high-quality soil in the last section of the stepped foundation pit to 220-50 cm away from the original ground, and then backfilling plain concrete to 2 heights above the original ground.
In addition, step-shaped reinforced concrete is installed beside the existing concrete structure 3 above the ground 2, and then the geogrid 11 is laid after high-quality soil is backfilled to the step surface.
The roadbed building overlapping structure and the construction method of the present invention have been described above, but the present invention is not limited to the above specific embodiments, and various modifications and changes can be made without departing from the scope of the claims. The present invention includes various modifications and alterations within the scope of the claims.
The construction method provided by the invention has all the advantages of the roadbed building overlapping structure.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A roadbed building overlapping structure, comprising: the concrete foundation pit is characterized by comprising an existing concrete structure (3) and a stepped foundation pit (1);
the stepped foundation pit (1) is arranged from the original place surface downwards, and one side of the stepped foundation pit (1) is in contact with the existing concrete structure (3);
the stepped foundation pit (1) includes: a plurality of sections of step planes (102) and step slopes (103) are arranged from the original plane downwards;
a filling layer (12) is arranged in the stepped foundation pit (1), the stepped foundation pit (1) is filled to be flush with the original ground (2) by the filling layer (12) in the horizontal direction, and the stepped foundation pit is in contact with the existing concrete structure (3) in the vertical direction;
the filling layer (12) comprises: a first geotextile (121);
the step plane (102) comprises: a pit bottom (101);
the first geotextile (121) is laid on the pit bottom, and the first geotextile (121) is fixed on the pit bottom (101) by using anchoring nails (6);
a medium coarse sand layer (7) is arranged on the first geotextile (121) laid on the pit bottom (101);
the step plane (102) comprises: a first stair plane (1021);
after the middle coarse sand layer (7) is laid, the middle coarse sand layer (7) is flush with the first step plane (1021);
and a second geotextile (122) is laid on the first step plane (1021) and the medium coarse sand layer (7), and the second geotextile (122) is fixed on the medium coarse sand layer (7) by using anchoring nails.
2. The roadbed building overlap structure of claim 1, wherein a fine soil layer (8) is laid on the second geotextile (122).
3. The roadbed building overlap structure according to claim 2, wherein a plain concrete layer (9) is laid when the high-quality soil layer (8) is at a distance of 20cm to 50cm from the original ground (2).
4. The roadbed building overlap structure of claim 3, wherein the existing concrete structure (3) comprises: a crown beam (302);
and a reinforced concrete step platform (10) is poured on the plain concrete layer (9).
5. The roadbed building overlap structure according to claim 4, wherein a geogrid (11) is laid on the terrace (10), and the geogrid (11) is connected by an anchor nail (6).
6. A construction method, which is used for the roadbed building lap joint structure as claimed in any one of claims 1 to 5, and sequentially excavating a plurality of stages of stepped foundation pits by adopting a multi-stage stepped excavation method on the original ground on one side of an existing concrete structure;
laying geotextile in the first stage of stepped foundation pit to cover the foundation pit bottom and the first stage of stepped slope, wherein one end of the geotextile is connected with the existing concrete structure through a hook (4) which is positioned at the height of the bottom surface of the foundation pit on the existing concrete, and the other end of the geotextile is remained;
after the first section of the stepped foundation pit is backfilled by medium coarse sand, the remaining part of the geotextile is reversely wrapped with backfill, and then the geotextile is connected with the existing concrete structure through a hook (4) which is positioned at the height of the platform surface of the first section of the stepped foundation pit on the existing concrete;
then, laying geotextile in the second section of stepped foundation pit to cover the backfill material of the first section of stepped foundation pit, the first section of stepped platform surface and the second section of stepped slope surface, wherein one end of the geotextile is connected with the existing concrete structure through a hook positioned at the height of the first section of stepped platform surface on the existing concrete, and the other end of the geotextile is left;
after the second-section stepped foundation pit is backfilled by high-quality soil, the remaining part of the geotextile is reversely wrapped with backfill, and then the geotextile is connected with the existing concrete structure through a hook positioned at the height of the platform surface of the second-section stepped foundation pit on the existing concrete;
then, backfilling high-quality soil on each step by the same method;
and backfilling high-quality soil in the last section of the stepped foundation pit to a distance of 20-50 cm from the original ground, and then backfilling plain concrete to the height of the original ground.
7. The construction method according to claim 6, wherein step-shaped reinforced concrete is installed beside the existing concrete structure above the ground, and thereafter geogrids are laid after each filling of fine soil to the step surface.
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| CN111364472A (en) * | 2020-03-20 | 2020-07-03 | 中交第三航务工程局有限公司 | Construction process of dry dock wall |
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| CN110273338A (en) * | 2019-07-18 | 2019-09-24 | 上海建工七建集团有限公司 | A kind of rigid road base and flexible roadbed interface and its processing method |
| CN112144337A (en) * | 2020-09-04 | 2020-12-29 | 广东同创科鑫环保有限公司 | Cast-in-place construction process for modified red mud-based foam light soil |
| CN113652923B (en) * | 2021-08-20 | 2023-01-06 | 广东省高速公路有限公司开阳扩建管理处 | Splicing method for rebuilding and expanding new and old road surfaces |
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| CN108221528A (en) | 2018-06-29 |
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