CN108661060B - Method for reinforcing road expansion construction excavation slope - Google Patents
Method for reinforcing road expansion construction excavation slope Download PDFInfo
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- CN108661060B CN108661060B CN201810493786.3A CN201810493786A CN108661060B CN 108661060 B CN108661060 B CN 108661060B CN 201810493786 A CN201810493786 A CN 201810493786A CN 108661060 B CN108661060 B CN 108661060B
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- E02D17/00—Excavations; Bordering of excavations; Making embankments
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Abstract
The application discloses a method for reinforcing a digging slope by road expansion, which is characterized in that a row of fender piles and a crown beam are arranged to reinforce the digging slope, and a construction scheme of the row of fender piles and the crown beam is obtained on the basis of geotechnical mechanical parameters of the digging slope and engineering size data of the digging slope. This application divides three stage to excavate the whitewashing construction, and after each stage excavation, the fixed wire net piece that protects that spouts is installed immediately to whitewashing is consolidated, simultaneously, buries the anchor rope and further consolidates. This application adopts row fender pile, shotcrete reinforcing bar net piece and anchor rope protection to improve the road bed effectively and found the structural stability who digs the side slope immediately, especially under the expert car condition, provides very big safety guarantee for platform back construction and platform basis, platform body construction. Compared with the adoption of the steel sheet pile guard pile, the method has the advantage that the bending strength is effectively guaranteed.
Description
Technical Field
The application relates to the technical field of building structures, in particular to a method for reinforcing a road reconstruction, expansion and vertical excavation slope.
Background
Generally, in a highway reconstruction and extension project, a half-width construction scheme of a half-width traffic vehicle is implemented, so that traffic inconvenience caused by construction can be reduced and urban traffic pressure can be relieved under the condition of normal construction, reconstruction and extension.
When the scheme of half-width construction of a half-width traffic vehicle is implemented, particularly after the abutment back of a half-width bridge abutment in the old bridge dismantling process is excavated, the roadbed of a traffic road section forms a vertical face side slope. At this time, if the local geological conditions are soft soil layers, broken rock-soil layers or other complicated geological conditions, and the disturbance of the opposite-excavation side slope caused by the passing vehicles on the passing road section makes the vertical-excavation side slope easily collapse, which is not only a serious potential safety hazard, but also brings difficulty to the construction.
Therefore, aiming at the road reconstruction and extension project, how to ensure the structural stability of the vertical face side slope and prevent the vertical face side slope from collapsing is a technical problem which needs to be solved before construction.
Disclosure of Invention
The embodiment of the application provides a method for reinforcing a digging slope for road reconstruction and expansion, which is used for ensuring the structural stability of a vertical face slope in a road reconstruction and expansion project and preventing the slope from collapsing.
According to the embodiment of the application, the method for reinforcing the road expansion and slope excavation establishment comprises the following steps:
calculating and determining various size data of row protecting piles and crown beams according to geotechnical mechanical parameters of the vertical excavation slope and engineering size data of the vertical excavation slope, wherein the size data of the row protecting piles comprise the number, the pile length, the pile diameter and the pile spacing, and the size data of the crown beams comprise the width and the height of the crown beams;
designing and manufacturing a steel bar framework of the row of fender piles and the crown beam according to all size data of the row of fender piles and the crown beam;
determining the coordinates of the row of fender piles at the center line of the old bridge deck back;
drilling by adopting a rotary drilling rig according to the coordinates of the row of guard piles, lowering a steel reinforcement framework of the row of guard piles, and pouring concrete in the holes to expose the steel reinforcement of the pile head for 40 cm;
adopting a small excavator to excavate the foundation pit, lowering a crown beam reinforcement cage, and pouring concrete;
after the strength of the concrete reaches 70%, excavating and spraying the concrete in three stages;
the first-stage excavation and guniting comprises excavating a road surface to the top surface part of a crown beam, mounting and fixing a spraying protection steel wire mesh, and guniting for 3-5 cm;
the second stage of excavation and guniting comprises excavating a part 3.5 meters below the top surface of the crown beam along the row of pile protection concrete surfaces, installing and fixing a guniting protection steel wire mesh, and guniting for 3-5 cm; calculating and determining the transverse spacing, the vertical spacing, the free section length and the anchoring section length of the anchor cables according to the geotechnical mechanical parameters of the vertical excavation slope and the engineering size data of the vertical excavation slope; drilling anchor cable holes, installing steel strands and a simple channel steel anchor backing plate, tensioning, pressing cement paste, and spraying the cement paste for 3-5 cm;
the third stage of excavation guniting includes excavating the remainder and repeating the second stage of construction steps.
Further, the physical and mechanical parameters of the rock and soil of the vertical excavation slope comprise thickness, weight, floating weight, cohesive force and an internal friction angle; the engineering dimension data of the vertical excavation slope comprises the length and the width of the vertical excavation slope.
Further, the method further comprises the step of carrying out stability verification on the reinforced vertical excavation slope.
Further, the pouring concrete is C30 concrete.
Furthermore, the spraying protection steel wire mesh adopts phi 6 round steel bars with the distance of 20cm multiplied by 20 cm.
Furthermore, the main reinforcement of the steel reinforcement framework of the row of the guard piles is phi 20 thread steel, and the stirrup is phi 8 round steel.
Furthermore, the main reinforcement of the crown beam steel reinforcement framework is phi 20 thread steel reinforcement, and the stirrup is phi 8 round steel reinforcement.
Further, in the second stage excavation guniting and third stage excavation guniting steps, the grout pressed in is C50 grout.
According to the technical scheme, before excavation, the opposite excavation slope is reinforced by arranging the row retaining piles and the crown beams, and the construction scheme of the row retaining piles and the crown beams is obtained based on the vertical excavation slope rock-soil physical mechanical parameters and the engineering size data of the vertical excavation slope. This application divides three stage to excavate the whitewashing construction, and after each stage excavation, the fixed wire net piece that protects that spouts is installed immediately to whitewashing is consolidated, simultaneously, buries the anchor rope and further consolidates.
This application adopts row fender pile, shotcrete reinforcing bar net piece and anchor rope protection to improve the road bed effectively and found the structural stability who digs the side slope immediately, especially under the expert car condition, provides very big safety guarantee for platform back construction and platform basis, platform body construction. Compared with the adoption of the steel sheet pile guard pile, the method has the advantage that the bending strength is effectively guaranteed.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a schematic view of a half-width construction scene of a half-width traffic van according to the present application;
FIG. 2 is a flow chart illustrating a method for slope reinforcement of road expansion and slope establishment according to an exemplary embodiment of the present application;
FIG. 3 is a schematic view of a construction scene after the row of fender piles and the crown beam are installed according to the present application;
FIG. 4 is a schematic view of a construction scene after the row of fender piles and the crown beam are installed according to the present application;
FIG. 5 is a schematic view of a construction scene of excavation and guniting according to the present application.
Detailed Description
The application aims at the half-width construction scheme of the half-width traffic vehicle in the existing expressway rebuilding and expansion project, and particularly solves the problem that the roadbed of a traffic road section forms the stability reinforcement of a vertical face side slope after the half-width abutment back is excavated out in the old bridge dismantling process. For example, referring to fig. 1, in the reconstruction and extension project for the road section a, a construction scheme of removing the old abutment back of the old bridge by using the north half (upper) traffic and the south half (lower) traffic is assumed to be adopted with the center line of the road surface as a boundary.
Referring to fig. 2, an embodiment of the present application provides a method for reinforcing a slope of a road through enlarging and digging, the method including the following steps:
step S110, calculating and determining various size data of row protecting piles and crown beams according to the physical and mechanical parameters of the vertical excavation slope rock and soil and the engineering size data of the vertical excavation slope, wherein the size data of the row protecting piles comprises the number, the pile length, the pile diameter and the pile spacing, and the size data of the crown beams comprises the width and the height of the crown beams;
in this application, before the slope excavation, experiment to the ground sample of potential slip plane, including cutting ring experiment, triaxial experiment, direct shear test, brazilian splitting experiment and unipolar compression test etc. obtain the physical mechanics parameter of ground, including thickness, heaviness, superficial weight, cohesion and internal friction angle etc..
Step 120, designing and manufacturing a steel reinforcement framework of the row of fender piles and the crown beam according to all size data of the row of fender piles and the crown beam;
optionally, the main reinforcement of the steel reinforcement framework of the row of the fender pile is a phi 20 thread steel reinforcement, and the stirrup is a phi 8 round steel reinforcement. The main reinforcement of the crown beam steel reinforcement framework is phi 20 thread steel reinforcement, and the stirrup is phi 8 round steel reinforcement.
Step 130, determining the coordinates of the row of fender piles at the center line of the old bridge deck back;
140, drilling by adopting a rotary drilling rig according to the row of pile protection coordinates, lowering a row of pile protection reinforcement cage, and pouring concrete in holes to expose the pile head reinforcement by 40 cm;
before the side slope is excavated, row pile protection construction is carried out, and after reinforcement, a foundation pit is excavated. As shown in fig. 2, the row of guard piles are arranged on one side of the excavated side slope, and can resist the downward thrust of the potential sliding slope of the side slope, and the thrust of the potential sliding slope body is transmitted to the stable bottom layer below the sliding surface under the combined action of the row of guard piles and the rock soil of the side slope, so that the deformation of the excavated side slope is controlled, and the collapse is avoided.
It should be noted that, in the present application, the concrete pouring construction is performed by using a manner of pouring concrete through the holes to ensure the quality of the concrete, and preferably, C30 concrete is used.
150, excavating a foundation pit by using a small excavator, lowering a crown beam reinforcement cage, and pouring concrete;
fig. 3 and 4 are schematic views of a construction scene after row fender piles and crown beams are installed. After the top beam is poured with concrete, the top beam and the row fender pile form a stable integrated structure, and the stability of the row fender pile is enhanced. Preferably, the pouring concrete is C30 concrete.
160, excavating and spraying concrete in three stages after the strength of the concrete reaches 70%;
in general, after the strength of the poured concrete reaches 70% of the strength after complete drying or after the age of 7 days, excavation guniting construction is started, referring to fig. 5, excavation guniting is performed in the following three stages:
the first stage of excavating and spraying concrete comprises excavating a road surface to the top surface part of a crown beam, mounting and fixing a spraying protection steel wire mesh, and spraying concrete for 3-5 cm;
optionally, the reinforced spraying protection steel wire mesh of the excavation guniting construction of the application all adopts phi 6 round steel bars with the distance of 20cm multiplied by 20 cm.
The second stage of excavation and guniting comprises excavating a part 3.5 meters below the top surface of the crown beam along the row of pile protection concrete surfaces, installing and fixing a guniting protection steel wire mesh, and guniting for 3-5 cm; calculating and determining the transverse spacing, the vertical spacing, the free section length and the anchoring section length of the anchor cables according to the geotechnical mechanical parameters of the vertical excavation slope and the engineering size data of the vertical excavation slope; drilling anchor cable holes, installing steel strands and a simple channel steel anchor backing plate, tensioning, pressing C50 cement paste, and spraying the cement paste for 3-5 cm;
the third stage of excavating and guniting comprises excavating the rest part and repeating the construction steps of the second stage, specifically, after the excavation of the rest part is finished, immediately installing and fixing a spraying protection steel wire mesh, and guniting for 3-5 cm; calculating and determining the transverse spacing, the vertical spacing, the free section length and the anchoring section length of the anchor cables according to the geotechnical mechanical parameters of the vertical excavation slope and the engineering size data of the vertical excavation slope; and drilling anchor cable holes, installing steel strands and a simple channel steel anchor backing plate, tensioning, pressing C50 cement paste, and spraying the cement paste for 3-5 cm.
Because the construction scheme of this application is half a full width open wagon half a width construction, and at the half a width of construction, what adopted is the mode of facade vertical excavation, does not put the slope and handles, so there is this face of excavation easy emergence collapse under the live load effect. Based on this, this application will excavate the whitewashing construction and divide into three stages and go on in succession, can effectively avoid the collapse that causes by above-mentioned reason.
In some preferred embodiments, the method further comprises: and (5) carrying out stability verification on the reinforced vertical excavation slope.
According to the method, before excavation, the opposite excavation slope is reinforced by arranging the row retaining piles and the crown beams, and the construction scheme of the row retaining piles and the crown beams is obtained based on the vertical excavation slope rock-soil physical mechanical parameters and the engineering size data of the vertical excavation slope. This application divides three stage to excavate the whitewashing construction, and after each stage excavation, the fixed wire net piece that protects that spouts is installed immediately to whitewashing is consolidated, simultaneously, buries the anchor rope and further consolidates.
This application adopts row fender pile, shotcrete reinforcing bar net piece and anchor rope protection to improve the road bed effectively and found the structural stability who digs the side slope immediately, especially under the expert car condition, provides very big safety guarantee for platform back construction and platform basis, platform body construction. Compared with the adoption of the steel sheet pile guard pile, the method has the advantage that the bending strength is effectively guaranteed.
The following will further describe a specific embodiment of the road enlarging and slope-digging building reinforcement method provided by the present application by using a project example.
The blue and white silver high-speed reconstruction and expansion project is located in Ningdong town, a half-width vehicle-through half-width reconstruction and expansion construction is carried out on the project, the expansion mode is that the original road is bilaterally expanded, 4 lanes are changed into 8 lanes, the original road base width is 26m, the extended road base width is 42m, the original bridge is dismantled and newly built, the original bridge platform back is excavated, and the platform back is backfilled to the designed elevation after the foundation is re-constructed.
In the construction process of reinforcing the opposite-digging side slope in the project, various size data of the row fender piles and the crown beams are calculated according to the physical and mechanical parameters of the vertical-digging side slope rock and soil and the engineering size data of the vertical-digging side slope, such as the thickness, the weight, the floating weight, the cohesive force and the internal friction angle of the vertical-digging side slope rock and soil, the length and the width of the vertical-digging side slope, the soil side pressure of a road section and the disturbance and load action when a vehicle passes through and the like.
The unified pile diameter is 80cm after checking, the clear distance between piles is 30cm, the piles are made of C30 reinforced concrete, and the guard piles are connected by C30 concrete crown beams. The pile protection length is 14m, and the embedding depth is 6 m; the width of the concrete crown beam is 80cm, and the height of the concrete crown beam is 50 cm.
And (3) after the bridge abutment and the back of the excavation platform are removed, spraying slurry to protect by using anchor cables and reinforcing steel bar meshes, wherein the anchor cables are 7 phi 15.2 steel stranded wires, the buried depth is 13m, the anchor cables are wholly embedded into a half-width roadbed of the traffic section, then C50 cement slurry is pressed in by stretching, and the reinforcing steel bar meshes are phi 6 round steel bars with the spacing of 20cm multiplied by 20 cm. The concrete guniting cover is adopted for vertically digging the side slope on the half platform back of the whole traffic section.
In a specific construction step, construction guiding and modifying is firstly carried out. According to the scheme of reporting the traffic guidance and modification repeated by traffic control departments, the south half is totally closed, and the middle of the north half is provided with a safe isolation water code to carry out bidirectional two-lane driving. And arranging safety isolation facilities and a light-reflecting mark at a position 50cm away from the top edge of the vertical excavation slope at the old bridge abutment back vertical excavation slope section, and arranging a road narrowing warning mark at the front. And specially-assigned people carry out safety warning in construction.
And secondly, performing row fender pile and crown beam construction. And (3) lofting out a pile protection coordinate at the central line of the old bridge abutment back according to a construction scheme, constructing according to construction procedures of drilling a bored concrete pile, lowering a reinforcement cage (a main reinforcement is 20mm in thread and a stirrup is 8mm in circle), pouring concrete and the like, wherein the construction adopts rotary drilling to drill holes, the reinforcement cage is lowered and the concrete is poured to carry out hoisting construction by using a 25-ton crane, and in order to ensure the quality of the concrete of the bored concrete pile, the hole separation construction is adopted in the drilling construction, a pile head reinforcement is exposed for 40cm and is connected with a crown beam into a whole. After the pile protection construction is completed, the elevation and the width are designed according to the scheme, a foundation pit is excavated by using a small excavator, then a crown beam steel reinforcement framework (the main reinforcement is 20mm in thread and the stirrup is 8mm in circle) is placed, crown beam concrete is poured, and after the concrete reaches 70% strength, the vertical face excavation can be carried out.
And finally, performing anchor cable and guniting construction. Excavating and guniting are carried out in three stages, wherein the first stage is that the pavement (the central line of the original pavement) reaches the top surface of the concrete crown beam, a spraying protection steel wire mesh is timely installed and fixed by rivets after the vertical surface is excavated, and then guniting is carried out for 3-5 cm; in the second stage, 3.5m is excavated along the concrete surface of the row of the fender piles below the top surface of the crown beam, a reinforcing mesh is timely installed and riveted, one end of the reinforcing mesh is fixed on the top surface of the crown beam, then anchor cable holes are drilled, steel strands and simple channel steel anchor backing plates are installed and tensioned, then C50 cement paste is pressed in, and then the cement paste is sprayed for 3cm-5cm for fixation; and in the third stage, excavating the rest earthwork, and performing subsequent construction according to the construction process of the second stage.
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The same and similar parts in the various embodiments in this specification may be referred to each other. In particular, for the embodiments, since they are substantially similar to the method embodiments, the description is simple, and the relevant points can be referred to the description in the method embodiments.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Claims (8)
1. A method for reinforcing a digging slope established by road expansion is characterized by comprising the following steps:
calculating and determining various size data of row protecting piles and crown beams according to geotechnical mechanical parameters of the vertical excavation slope and engineering size data of the vertical excavation slope, wherein the size data of the row protecting piles comprise the number, the pile length, the pile diameter and the pile spacing, and the size data of the crown beams comprise the width and the height of the crown beams;
designing and manufacturing a steel bar framework of the row of fender piles and the crown beam according to all size data of the row of fender piles and the crown beam;
determining the coordinates of the row of fender piles at the center line of the old bridge deck back;
drilling by adopting a rotary drilling rig according to the coordinates of the row of guard piles, lowering a steel reinforcement framework of the row of guard piles, and pouring concrete in the holes to expose the steel reinforcement of the pile head for 40 cm;
adopting a small excavator to excavate the foundation pit, lowering a crown beam reinforcement cage, and pouring concrete;
after the strength of the concrete reaches 70%, excavating and spraying the concrete in three stages;
the first-stage excavation and guniting comprises excavating a road surface to the top surface part of a crown beam, mounting and fixing a spraying protection steel wire mesh, and guniting for 3-5 cm;
the second stage of excavation and guniting comprises excavating a part which is 3.5 meters below the top surface of the crown beam along the row of the fender pile concrete surface, installing and fixing a guniting and protecting steel wire mesh, guniting for 3cm-5cm, wherein the 3.5 meter part comprises the thickness of the crown beam; calculating and determining the transverse spacing, the vertical spacing, the free section length and the anchoring section length of the anchor cables according to the geotechnical mechanical parameters of the vertical excavation slope and the engineering size data of the vertical excavation slope; drilling anchor cable holes, installing steel strands and channel steel anchor backing plates, tensioning, pressing cement paste, and spraying the cement paste for 3-5 cm;
the third stage of excavation guniting includes excavating the remainder and repeating the second stage of construction steps.
2. The method according to claim 1, wherein the vertical excavation slope geotechnical mechanical parameters comprise thickness, weight, float weight, cohesive force and internal friction angle; the engineering dimension data of the vertical excavation slope comprises the length and the width of the vertical excavation slope.
3. The method of claim 1, further comprising performing stability verification on the reinforced cut-and-raised slope.
4. The method as claimed in claim 1, wherein the pouring concrete is C30 concrete.
5. The method of claim 1, wherein the sprayed steel wire mesh is made of 6-round steel bars with a distance of 20cm x 20 cm.
6. The method of claim 1, wherein the main bars of the row of the pile cages are phi 20 twisted bars and the stirrups are phi 8 round bars.
7. The method of claim 1, wherein the main bars of the crown beam skeleton are phi 20 twisted bars and the stirrups are phi 8 round bars.
8. The method of claim 1 wherein the grout forced during the second stage excavation guniting and third stage excavation guniting steps is a C50 grout.
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| CN110095097B (en) * | 2019-03-27 | 2020-11-03 | 莆田学院 | Method for predicting safe soil dumping distance of top muck truck of soil slope |
| CN113152419A (en) * | 2021-01-12 | 2021-07-23 | 四川省交通建设集团股份有限公司 | Method for reinforcing roadbed at transition section behind bridge and culvert abutment by using miniature steel pipe piles |
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| KR101316719B1 (en) * | 2011-12-07 | 2013-10-10 | 재 술 나 | Structure for reinforcing sloping ground of roadside having guardrail |
| CN104278608B (en) * | 2013-07-05 | 2016-06-08 | 杭州华水市政工程有限公司 | The constructional method of a kind of highway embankment widened structure |
| CN105274998B (en) * | 2015-11-19 | 2017-01-18 | 杭州江润科技有限公司 | Construction method of assembled pile-plate-anchor-beam combination type batholith support |
| CN106368093B (en) * | 2016-11-11 | 2018-07-03 | 合肥工业大学 | A kind of construction method of the high embankment widening subgrade of high polymer grouting reinforcement anti-settling |
| CN106988178A (en) * | 2017-04-14 | 2017-07-28 | 华中科技大学 | A kind of subgrade in soft soil zone widened structure and its construction method |
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Effective date of registration: 20200810 Address after: 750001 room 1217, 12 / F, building 1, Fortune Center, Qingchun building, Xingqing District, Yinchuan City, Ningxia Hui Autonomous Region Patentee after: Ningxia Zhongda Highway Construction Co.,Ltd. Address before: 750001 Jinfeng District, the Ningxia Hui Autonomous Region, Wanshou Road, No. 142, Yinchuan Patentee before: NINGXIA ROAD & BRIDGE ENGINEERING Co.,Ltd. |
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Address after: Office building 2, Luqiao building, 142 Wanshou Road, Jinfeng District, Yinchuan City, Ningxia Hui Autonomous Region, 750004 Patentee after: Ningxia highway and Bridge Construction Co., Ltd Address before: 750001 room 1217, 12 / F, building 1, Fortune Center, Qingchun building, Xingqing District, Yinchuan City, Ningxia Hui Autonomous Region Patentee before: Ningxia Zhongda Highway Construction Co.,Ltd. |