CN112252105A - Method for treating void at bottom of raft plate of roadbed pile raft structure - Google Patents
Method for treating void at bottom of raft plate of roadbed pile raft structure Download PDFInfo
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- CN112252105A CN112252105A CN202011079877.6A CN202011079877A CN112252105A CN 112252105 A CN112252105 A CN 112252105A CN 202011079877 A CN202011079877 A CN 202011079877A CN 112252105 A CN112252105 A CN 112252105A
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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
- E01C3/04—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
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
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- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The application provides a method for renovating a raft bottom void of a roadbed pile raft structure, comprising: determining the positions of the tubular piles and the raft plates of the pile-raft structure; marking the distribution positions of grouting holes according to the positions of the tubular piles and the raft plates; drilling grouting holes according to the distribution positions of the grouting holes; inserting a grouting pipe into the grouting hole; and injecting the slurry into the slurry injection pipe. The application provides a renovation method gets the injected hole through boring to insert the slip casting pipe in the injected hole, thereby can pour into thick liquids into the bottom of raft, solve the problem that raft bottom is vacated effectively.
Description
Technical Field
The application relates to the field of maintenance and maintenance of roadbed structures, in particular to a method for treating the void bottom of a raft plate of a roadbed pile raft structure.
Background
The pile-raft structure formed from rigid tubular pile and reinforced concrete raft plate is an effective method for settling soft foundation of road bed in bridge-road transition section of high-speed railway, highway and track traffic, etc. the raft plate of pile-raft structure is made up by using reinforced concrete plate with a certain thickness, and can be used for homogenizing load transferred from upper portion to foundation, at the same time, the arrangement of the raft plate also can be used for making good constraint action on lateral deformation of tubular pile so as to prevent local stress concentration and integral settlement.
However, as time goes on, the bottom of the raft plate of the roadbed pile raft structure is easy to generate void diseases, and the damage caused by the void diseases is settlement of filling soil outside the roadbed raft plate and cracking of a side slope, so that the operation safety of the roadbed structure is seriously affected.
Disclosure of Invention
A method for treating the bottom of a raft plate of a roadbed pile raft structure is used for solving the problem of the bottom of the raft plate of the roadbed pile raft structure being empty.
In order to achieve the above object, an embodiment of the present application provides a method for remedying a raft bottom void in a roadbed pile raft structure, including:
determining the positions of the tubular piles and the raft plates of the pile-raft structure;
marking the distribution positions of grouting holes according to the positions of the tubular piles and the raft;
drilling the grouting holes according to the distribution positions of the grouting holes;
inserting a grouting pipe into the grouting hole;
and injecting slurry into the grouting pipe.
Further, before the step of injecting the slurry into the slurry injection pipe, the renovation method further comprises the following steps:
and a grout stop plug is arranged at the orifice of the grouting pipe.
Further, before the step of injecting the slurry into the slurry injection pipe, the renovation method further comprises the following steps:
preparing foam cement slurry;
the foamed cement slurry is screened.
Further, in the step of injecting the slurry into the grouting pipe, a full-automatic detection sensor is adopted to detect the linear shape of the track in real time.
Further, after the step of injecting the slurry into the slurry injection pipe, the renovation method further comprises the following steps:
and (4) adopting a rail inspection trolley to recheck the line shape of the rail.
Further, the step of drilling the grouting holes according to the distribution positions of the grouting holes specifically includes:
and respectively leading holes from two sides of the circuit to the bottom of the raft plate according to the distribution positions of the grouting holes, forming the holes by adopting sleeve follow-up, and drilling the grouting holes.
Furthermore, a plurality of groups of slurry outlets are arranged on the grouting pipe, the number of each group of slurry outlets is 3-6, and the distance between every two adjacent groups of slurry outlets is 300-360 mm.
Further, the grouting holes are parallel to the bottom surface of the raft and perpendicular to the extending direction of the circuit; and/or the presence of a gas in the gas,
the grouting holes are attached to the bottom surfaces of the rafts; and/or the presence of a gas in the gas,
the grouting holes are formed between two adjacent pipe piles; and/or the presence of a gas in the gas,
the depth of the grouting holes is larger than or equal to half of the width of the raft.
Further, the step of injecting the slurry into the slurry injection pipe specifically comprises: and adopting a mode of symmetrically grouting along two sides of the line, and carrying out hole jumping grouting on the grouting holes from two ends to the middle in the extending direction of the line.
Further, the step of performing jump grouting on the grouting holes from two ends to the middle of the line extending direction specifically comprises:
when the number of the grouting holes on one side of the line is odd, jumping hole grouting is performed on the grouting holes from the first grouting holes at two ends to the middle grouting hole along the extending direction of the line, and after the jumping hole grouting is completed, jumping hole grouting is performed on the remaining grouting holes which are not grouted;
and when the number of the grouting holes on one side of the line is even, one end of the grouting hole starts from the first grouting hole and the other end of the grouting hole starts from the second grouting hole to the middle part along the extending direction of the line, and after the grouting hole jumping grouting is completed, the grouting holes which are not grouted are subjected to jumping-hole grouting.
The utility model provides a way foundation pile raft mechanism raft board bottom void renovation method gets the slip casting hole through boring to insert the slip casting pipe in the slip casting hole, can pour into thick liquids into the bottom of raft board, thereby solved the problem of raft board bottom void effectively.
Drawings
Fig. 1 is a cross-sectional view of a roadbed pile raft structure provided in an embodiment of the present application;
fig. 2 is a distribution diagram of grouting holes in a roadbed pile raft structure according to an embodiment of the present application;
FIG. 3 is a flow chart of an remediation method according to an embodiment of the present application;
FIG. 4 is a flow chart of an remediation method according to another embodiment of the present application; and
fig. 5 is a flowchart of an remediation method according to yet another embodiment of the present application.
Description of reference numerals:
1. a tubular pile; 2. a raft plate; 21. the boundary line of the raft plate; 3. grouting holes; 4. a grouting pipe; 51. a road shoulder line; 52. a toe line; 6. a track line; 7. and (4) soil body.
Detailed Description
It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.
The directional terms in the description of the present application are used for convenience in describing the present application and for simplicity in description, and do not 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 the present application.
In the prior art, please refer to fig. 1 and 2, lines for operations of high-speed railways, highways, rail transportation, etc., such as a rail line 6, are usually laid on a roadbed, the roadbed includes a pile raft structure, the pile raft structure usually includes a pipe pile 1 and a raft 2, one end of the pipe pile 1 is inserted into a soil body 7, and the other end is connected to the raft 2 to provide a certain support for the raft 2. In addition, the roadbed typically has a shoulder line 51 and a toe line 52, and raft boundary lines 21 on both sides of the rafts 2 are located inward of the toe line 52.
However, over time, the subgrade soil 7 generates hyperstatic pore water pressure component dissipation under the action of load, pore water is discharged, and the pore volume is reduced, for example, if the solid framework of the soil 7 is slowly deformed in a creep mode for a long time, the soil 7 is subjected to compaction settlement or secondary consolidation settlement, so that the bottom of the raft plate 2 of the subgrade pile raft structure is subjected to void damage.
An embodiment of the present application provides a method for remedying a raft bottom void in a roadbed pile raft structure, please refer to fig. 1 to 5, the method includes:
s10, determining the positions of the tubular pile 1 and the raft plate 2 of the pile-raft structure;
s20, marking the distribution positions of the grouting holes 3 according to the positions of the tubular piles 1 and the raft plates 2;
s30, drilling grouting holes 3 according to the distribution positions of the grouting holes 3;
s40, inserting the grouting pipe 4 into the grouting hole 3;
s50, slurry is injected into the slurry injection pipe 4.
Specifically, a manual excavation mode is adopted to excavate and explore the vicinity of the construction range base line, the actual positions of the pile raft overall structure tubular pile 1 and the raft plate 2 are determined, and the positions of the grouting holes 3 are determined and marked according to the positions of the pile raft overall structure tubular pile 1 and the raft plate 2. It should be noted that, pile body 1 can be the prestressing force tubular pile, including pile body and pile cap, and the junction of pile body and raft 2 is connected to the pile cap for increase the effect area of action force between pile body and raft 2, in order to reduce the damage to raft 2. In order to prevent the bottom of the raft 2 from being emptied, the grouting holes 3 should be distributed at the bottom of the raft 2 as much as possible, and the pile body and the pile cap need to be avoided. For example, in order to facilitate construction to form the grouting holes 3, the extending direction of the grouting holes 3 should be perpendicular to the shaft direction of the tubular pile 1 and the line extending direction. The number of grouting holes 3 should be specifically set up according to the length of the part of raft 2 bottom void along the line direction to when guaranteeing to solve raft 2 bottom void disease, be unlikely to cause excessive upwarp of raft 2 again.
The renovation method that this application embodiment provided gets slip casting hole 3 through boring to insert slip casting pipe 4 in slip casting hole 3, thereby can pour into thick liquids into raft 2's bottom, treat that thick liquids solidify the shaping back in raft 2 bottoms, alright provide certain support for raft 2, thereby solved the problem that raft 2 bottoms are vacated effectively.
It can be understood that the body of the grouting pipe 4 should be provided with a grout outlet, so that after the grout is injected into the grouting pipe 4 under a certain pressure, the grout will flow out to the bottom void of the raft 2 through the grout outlet to fill the bottom of the raft 2.
In an embodiment, in the renovation method provided by the application, a plurality of groups of slurry outlets are arranged on the grouting pipe 4, the number of each group of slurry outlets is 3-6, and the distance between two adjacent groups of slurry outlets is 300-600 mm. For example, the number of the slurry outlets in each group can be 3, 4, 5 or 6, and the distance between two adjacent groups of slurry outlets can be 300mm, 400mm, 500mm or 600 mm. It can be understood that the grouting position can be controlled by controlling the distribution of the grout outlet, and the grouting amount can be controlled by controlling the number of the grout outlet, so that the grouting process can be controlled more accurately by an operator. It can be understood that the diameter of the slurry outlet has a large influence on the slurry injection pressure and the like, and the diameter of the slurry injection port is usually selected to be 4 mm.
In an embodiment, in the remedial method provided by the present application, the step of drilling the grouting holes 3 according to the distribution positions of the grouting holes 3 at S30 specifically includes: according to the distribution position of grouting holes 3, holes are led from two sides of the circuit to the bottom of the raft 2, sleeves are adopted to follow up the holes, and the grouting holes 3 are drilled.
Specifically, carry out the trompil respectively from the both sides of circuit, the drilling construction of the injected hole 3 of being convenient for more can improve the straightness accuracy of injected hole 3 simultaneously, reduces its quantity that takes place the deflection at the in-process of drilling, and then damages the risk of structures such as raft 2 or tubular pile 1. And the sleeve is adopted to follow up the hole forming, so that accidents such as soil body collapse and the like in the process of drilling the grouting hole 3 can be prevented. Preferably, the grouting pipe 4 is a steel grouting floral pipe, the diameter of the grouting hole 3 is 110mm, and the pipe diameter of the grouting floral pipe is 40 mm.
In order to avoid disturbing the roadbed structure during construction to influence driving safety, a self-propelled screw drill can be adopted for drilling a grouting hole 3, the drill is stable and firm to place, a drill bit is aligned to the center of the grouting hole 3, the drilling angle of a drill rod is parallel to the bottom of the raft 2 and perpendicular to the line direction, and for example, the deviation between the angle of the drill rod and the angle required by design is controlled within the range of +/-1.5%.
In an embodiment, referring to fig. 4, in the method for treating provided by the present application, before the step of injecting the slurry into the slurry injecting pipe 4 at S50, the method for treating further includes:
and S60, installing a grout stop plug at the orifice of the grouting pipe 4.
It can be understood that the slurry is injected into the grouting pipe 4 under a certain pressure, and the slurry in the grouting pipe 4 can be effectively prevented from flowing back out of the orifice of the grouting pipe 4 by arranging the slurry stop plug.
In an embodiment, referring to fig. 5, in the method for treating provided by the present application, before the step of injecting the slurry into the slurry injecting pipe 4 at S50, the method for treating further includes:
s70, preparing foam cement slurry;
s80, screening the foam cement slurry.
The foam cement slurry has the advantages of light weight, strong waterproof capability, good overall performance and the like, when the foam cement slurry is prepared, common Portland cement of 42.5 grades is generally adopted, the cement slurry is prepared according to the water cement ratio of 0.6-1.2, and a foaming agent of 20-50 kg/m is used in single-component cement slurry3Preparing foam by mechanical foaming equipment, mixing the prepared cement slurry with the foam, and blending by adopting a blade type mechanical stirrer.
After the foam cement slurry is preliminarily prepared, the foam cement slurry needs to be sieved, preferably, the diameter of a sieving hole is 3-6 mm, for example, the diameter can be 3mm, 4mm, 5mm or 6mm, and the like.
In an embodiment, in the renovation method provided by the application, in the step of injecting the slurry into the slurry injection pipe 4S 50, a full-automatic detection sensor is adopted to detect the linear shape of the track in real time, so that an operator can determine whether to continue slurry injection.
Specifically, when the fully automatic sensor detects that the grouting pressure exceeds a certain value, such as 0.2MPa, and the pressure is stabilized for a certain period of time, such as 10 minutes, or the like, or when the fully automatic sensor detects that the amount of the track arching exceeds a certain value, such as 2mm, the grouting should be terminated. It will be appreciated that the amount of grouting should not be too great or too small, and when the grouting pressure exceeds a certain pressure, it is indicated that the slurry at the bottom of the raft 2 has reached a certain volume, and the slurry at that volume has been able to meet the relevant requirements for the amount of slurry required to remediate the void at the bottom of the raft 2, at which point the grouting should naturally be terminated. And when the arched girder on the track exceeds a certain value, the line shape of the track is proved to have reached the relevant requirements, and grouting is naturally stopped.
In an embodiment, referring to fig. 4 and 5, in the renovation method provided by the present application, after the step of injecting the slurry into the slurry injecting pipe 4 at S50, the renovation method further includes:
and S90, adopting a rail inspection trolley to check the line shape of the rail.
After the grouting construction is completed, the line shape of the track is rechecked through the rail inspection trolley, and the line can be opened for traffic after the line shape of the track is confirmed to be correct, so that the safe operation of the railway is ensured.
In an embodiment, referring to fig. 1 and 2, in the remediation method provided by the present application, the grouting holes 3 are parallel to the bottom surface of the raft 2 and are square extending perpendicular to the line, which is more favorable for drilling the grouting holes 3, and more effectively reduces the adverse effects of the construction of the grouting holes 3 on the pipe piles 1 and the raft 2.
In an embodiment, referring to fig. 1, in the remediation method provided by the present application, the grouting holes 3 are attached to the bottom of the raft 2, so that after grouting, the slurry is solidified and formed, and then is better combined with the raft 2, thereby providing a better supporting effect for the raft 2.
In one embodiment, referring to fig. 2, in the method for treating the tubular pile, the grouting holes 3 are disposed between two adjacent tubular piles 1. It can be understood that the distribution of tubular pile 1 has certain law, through with grouting hole 3 set up in the middle of two adjacent tubular piles 1, more be favorable to grouting hole 3's overall distribution to in raft 2 bottoms grouting more evenly. Meanwhile, because two sides of the line between two adjacent rows of tubular piles 1 are respectively provided with one grouting hole 3, in order to prevent the grouting holes 3 on the two sides from interfering in the construction process, generally, the axes of the two grouting holes 3 between two adjacent rows of tubular piles 1 are separated by a certain distance, as shown in fig. 2.
In the embodiment, referring to fig. 2, the depth of the grouting holes 3 is greater than or equal to the width of the raft 2 in the renovation method provided by the present application. To the injected hole 3 of being under construction respectively along line both sides, through setting up the degree of depth of injected hole 3 and be greater than or equal to half of raft 2 width to guarantee that raft 2's intermediate position also can have sufficient thick liquids to fill.
In an embodiment, in the renovation method provided by the present application, the step of injecting the slurry into the slurry injection pipe 4 at S50 specifically includes: and (3) performing jump grouting on the grouting holes 3 from two ends to the middle in the extending direction of the line by adopting a mode of symmetrically grouting along two sides of the line. Specifically, between adjacent tubular piles 1, grouting should be simultaneously performed in grouting holes 3 on both sides of the line to improve the uniformity of stress and deformation of both sides of the raft 2. And the mode of jumping hole grouting is adopted, so that the phenomenon that slurry is mixed due to excessive slurry flowing into the bottom of the raft plate 2 at one time can be prevented.
Specifically, in an embodiment, in the renovation method provided by the present application, the step of performing jump grouting on the grouting hole 3 from two ends to the middle in the line extending direction specifically includes:
when the number of the grouting holes 3 on one side of the line is odd, jumping hole grouting is performed on the grouting holes 3 from the first grouting holes 3 at two ends to the middle grouting hole 3 along the extending direction of the line, and after the jumping hole grouting is performed on the remaining grouting holes 3 which are not grouted, namely jumping hole grouting is performed on the grouting holes 3 from the second grouting holes 3 at two ends to the middle grouting hole 3 along the extending direction of the line.
And when the number of the grouting holes 3 on one side of the line is even, jumping hole grouting is performed on the grouting holes 3 from the first grouting hole 3 at one end and from the second grouting hole 3 to the middle grouting hole 3 at the other end along the extending direction of the line, and after the jumping hole grouting is performed on the residual grouting holes 3 which are not grouted, namely, jumping hole grouting is performed on the grouting holes 3 from the second grouting hole 3 to the middle grouting hole 3 from the first grouting hole 3 at one end along the extending direction of the line.
The purpose of doing so is, when the slip casting at every turn, can not carry out the slip casting simultaneously in two adjacent slip casting holes 3 intraductally, is favorable to the evenly distributed of raft 2 bottom thick liquids. It can be understood that when hole jumping grouting is performed each time, grouting needs to be performed simultaneously on the grouting holes 3 on two sides of the line, and in order to save time and facilitate detection of the line shape of the track, grouting is performed simultaneously on the grouting holes 3 after hole jumping. That is, the grouting is performed twice in total, and the grouting holes 3 at each grouting are not adjacent to each other.
The various embodiments/implementations provided herein may be combined with each other without contradiction. 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 method for renovating the void at the bottom of raft plate of roadbed pile raft structure, which is characterized by comprising the following steps:
determining the positions of the tubular piles and the raft plates of the pile-raft structure;
marking the distribution positions of grouting holes according to the positions of the tubular piles and the raft;
drilling the grouting holes according to the distribution positions of the grouting holes;
inserting a grouting pipe into the grouting hole;
and injecting slurry into the grouting pipe.
2. The remediation method of claim 1 wherein prior to the step of injecting slurry into said grouting pipe, said remediation method further comprises:
and a grout stop plug is arranged at the orifice of the grouting pipe.
3. The remediation method of claim 1 wherein prior to the step of injecting slurry into said grouting pipe, said remediation method further comprises:
preparing foam cement slurry;
the foamed cement slurry is screened.
4. The renovation method as claimed in claim 1, wherein in the step of injecting the slurry into the grouting pipe, the line shape of the track is detected in real time by using a fully automatic detection sensor.
5. The remediation method of claim 1, wherein after the step of injecting slurry into the grout pipe, the remediation method further comprises:
and (4) adopting a rail inspection trolley to recheck the line shape of the rail.
6. The method according to claim 1, wherein the step of drilling the grout holes according to the distribution positions of the grout holes comprises:
and respectively leading holes from two sides of the circuit to the bottom of the raft plate according to the distribution positions of the grouting holes, forming the holes by adopting sleeve follow-up, and drilling the grouting holes.
7. The renovation method of claim 1, wherein a plurality of groups of grout outlets are arranged on the grouting pipe, the number of the grout outlets in each group is 3-6, and the distance between two adjacent groups of grout outlets is 300-360 mm.
8. The method according to any one of claims 1 to 7, wherein the grouting holes are parallel to the bottom surface of the raft and perpendicular to the direction in which the lines extend; and/or the presence of a gas in the gas,
the grouting holes are attached to the bottom surfaces of the rafts; and/or the presence of a gas in the gas,
the grouting holes are formed between two adjacent pipe piles; and/or the presence of a gas in the gas,
the depth of the grouting holes is larger than or equal to half of the width of the raft.
9. The renovation method according to any one of claims 1 to 7, characterized in that the step of injecting the slurry into the grouting pipe comprises: and adopting a mode of symmetrically grouting along two sides of the line, and carrying out hole jumping grouting on the grouting holes from two ends to the middle in the extending direction of the line.
10. The renovation method as claimed in claim 9, characterized in that the step of jump grouting the grouting holes from the two ends to the middle of the direction in which the line extends is carried out by:
when the number of the grouting holes on one side of the line is odd, jumping hole grouting is performed on the grouting holes from the first grouting holes at two ends to the middle grouting hole along the extending direction of the line, and after the jumping hole grouting is completed, jumping hole grouting is performed on the remaining grouting holes which are not grouted;
and when the number of the grouting holes on one side of the line is even, jumping-hole grouting is performed on the grouting holes from the first grouting hole at one end and from the second grouting hole to the middle grouting hole at the other end along the extending direction of the line, and after the jumping-hole grouting is completed, the remaining grouting holes which are not grouted are subjected to jumping-hole grouting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011079877.6A CN112252105A (en) | 2020-10-10 | 2020-10-10 | Method for treating void at bottom of raft plate of roadbed pile raft structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011079877.6A CN112252105A (en) | 2020-10-10 | 2020-10-10 | Method for treating void at bottom of raft plate of roadbed pile raft structure |
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| CN112252105A true CN112252105A (en) | 2021-01-22 |
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