CN115821997A - Construction method for actively controlling deformation of building through multi-row grouting - Google Patents
Construction method for actively controlling deformation of building through multi-row grouting Download PDFInfo
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- CN115821997A CN115821997A CN202211191743.2A CN202211191743A CN115821997A CN 115821997 A CN115821997 A CN 115821997A CN 202211191743 A CN202211191743 A CN 202211191743A CN 115821997 A CN115821997 A CN 115821997A
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Abstract
The invention discloses a construction method for actively controlling deformation of a building by multi-row grouting, which comprises the following steps: obtaining the number and the positions of a plurality of rows of grouting holes between the building structure to be rectified and the foundation pit and the range of grouting expansion areas in the grouting holes through theoretical calculation or numerical simulation calculation; preparing grouting pipes, wherein each grouting pipe consists of a pipe A and a pipe B which are bound together, the axes of the pipe A and the pipe B are parallel, the top surfaces of the pipe A and the pipe B are flush, the length of the pipe B is greater than that of the pipe A, and the area between the bottom wall of the pipe B and the bottom wall of the pipe A is a grouting expansion area; drilling a grouting hole by using a drilling machine according to a preset position; digging a foundation pit on the inner side of the underground diaphragm wall, measuring the horizontal deformation of the building structure to be rectified by using an instrument in a segmented mode, and inserting a grouting pipe into a grouting hole in the position corresponding to the horizontal deformation for grouting according to the horizontal deformation measuring result of the building structure when the horizontal deformation exceeds the alarm value set before engineering construction. The method can effectively increase the effect of deformation regulation and control.
Description
Technical Field
The invention relates to an underground engineering construction method, in particular to an implementation method for controlling horizontal deformation of building structures such as tunnels, subway stations and the like in a construction process.
Background
The construction of the foundation pit for the development of the underground space inevitably causes deformation of the surrounding soil mass, thereby causing deformation of the structures such as tunnels in the soil mass and subway stations. This brings threats to the structural safety and the operation safety of subway lines and the like, and also brings new challenges to the design level of foundation pits and the construction technology. In order to reduce the influence of the foundation pit construction on the building structures such as the adjacent existing tunnel, necessary control measures need to be taken. Existing protective measures can be divided into active protective measures and passive protective measures.
The active control measures mainly comprise grouting and horizontal support axial force servo control technologies. At present, the research on grouting and lifting existing buildings or tunnels is more, the research on grouting and controlling horizontal deformation of buildings such as tunnels is less, and a system grouting theory and strategy for controlling the horizontal deformation are lacked. The control capability of the traditional grouting compensation technology has certain limitation, the extensive grouting method neglects the research on the grouting sequence, is difficult to effectively improve the deformation effect of the deviation-correcting object, has influence on the construction of peripheral engineering, and cannot maximize the deformation control effect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a construction method for actively controlling the deformation of a building by multi-row grouting, which can efficiently recover the deformation of the building such as a tunnel and the like and does not influence other surrounding structures.
To solve the above-described problems, the following technical solutions are provided.
The invention provides a construction method for actively controlling deformation of a building by multi-row grouting, which comprises the following steps:
obtaining the number and the positions of a plurality of rows of grouting holes between a building to be rectified and a foundation pit and the range of grouting expansion areas in the grouting holes through theoretical calculation or numerical simulation calculation, wherein the plurality of rows of grouting holes are arranged into two rows, three rows or more according to theoretical calculation or numerical simulation results;
preparing grouting pipes, wherein each grouting pipe consists of a pipe A and a pipe B which are bound together, the axes of the pipe A and the pipe B are parallel, the top surfaces of the pipe A and the pipe B are flush, the length of the pipe B is greater than that of the pipe A, and the area between the bottom wall of the pipe B and the bottom wall of the pipe A is a grouting expansion area;
step three, drilling a grouting hole by using a drilling machine according to the position set in the step one, and using slurry to protect a wall in the process of drilling the grouting hole;
fourthly, excavating a foundation pit on the inner side of the underground diaphragm wall, measuring the horizontal deformation of the building structure to be rectified in a segmented mode by using an instrument, inserting a grouting pipe into a grouting hole in the position corresponding to the horizontal deformation according to the horizontal deformation measuring result of the building structure when the horizontal deformation exceeds an alarm value set before engineering construction, and then executing the following grouting process:
the method comprises the following steps that firstly, grouting is started from a row of grouting holes far away from a building structure to be corrected, and when grouting is conducted in grouting pipes in the grouting holes, cement slurry is injected through a pipe B of the grouting pipes until the whole grouting holes are filled with the cement slurry;
step two, injecting water glass through the pipe A of the grouting pipe, mixing the water glass with the cement slurry in the length range of the pipe A below the ground surface in the grouting hole, and sealing the hole;
thirdly, injecting double-fluid slurry through a pipe B of the grouting pipe; the double-liquid slurry is prepared by mixing cement slurry and water glass;
and fourthly, continuously measuring the horizontal deformation recovery condition of the building to be rectified in the grouting process, repeating the first step to the third step, and grouting into the grouting pipes in the grouting holes according to the grouting sequence from far to near from the control area to be rectified until the horizontal deformation of the building to be rectified is reduced to be below an alarm value.
The beneficial results of the invention are as follows:
1. through the slip casting order from far to near, the soil body in the slip casting region in advance has the counter-force effect to the soil body deformation of follow-up slip casting one side for follow-up slip casting is bigger to the effect of the horizontal displacement effect of the soil body with the same side of slip casting direction, effectively increases the effect of deformation regulation and control.
2. The soil body in the area of the prior grouting has a shielding effect on the deformation of the soil body on the other side of the subsequent grouting, the horizontal displacement of the soil body on the opposite side of the grouting direction is reduced, and the influence on the building on the other side of the grouting sequence can be reduced.
3. The method has the advantages of high efficiency, economy and wide application range, and the deviation rectification object can be various building structures such as a tunnel, a subway station or a foundation pit support structure.
Drawings
FIG. 1 is a sectional view of a grouting expansion area;
FIG. 2 is a schematic view of a single hole grouting process;
FIG. 3 is a schematic view of a grouting sequence of each row of grouting holes;
fig. 4 is a schematic diagram of the horizontal displacement effect of the soil body after grouting is completed.
Detailed Description
In order to make the objects, aspects and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings and a specific embodiment.
The principle of the method is that the blocking effect of the soil body of the prior grouting area on the deformation of the soil body on the other side of the subsequent grouting is utilized, the positions and the number of the grouting holes are determined according to the deformation condition of the object to be corrected and the position conditions of other nearby building structures by combining the results of theoretical calculation and numerical simulation, so that the control effect on the object to be corrected is improved, and meanwhile, the negative influence on other nearby building structures is reduced.
As shown in fig. 1-3, the method for implementing multi-row grouting active control building deformation according to the present invention comprises the following steps:
firstly, when the building structures such as a tunnel or a subway station and the like horizontally deform due to foundation pit excavation and the like, calculating the number and the positions of a plurality of rows of grouting holes between a building 2 to be corrected and a foundation pit 3 and the range of a grouting expansion area 1 in the grouting holes through theoretical calculation or numerical simulation (for example, software such as PLAAXIS or FLAC and the like), preferably, the connecting line of the centers of each row of grouting holes is parallel to the axial direction of the building 2 to be corrected; the multiple rows of grouting holes are arranged into two, three or more rows according to theoretical calculation or numerical simulation results. The aperture of the grouting hole can be 50-60 mm.
And step two, preparing grouting pipes, wherein each grouting pipe consists of a pipe A and a pipe B which are bound together, the axes of the pipe A and the pipe B are parallel, the top surfaces of the pipe A and the pipe B are flush, the length of the pipe B is greater than that of the pipe A, and the area between the bottom wall of the pipe B and the bottom wall of the pipe A is a grouting expansion area 1. The bottom of the grouting pipe is provided with a hole, so that the grout can flow out conveniently. The size of the grouting expansion area can be controlled by adjusting the lengths of the pipe A and the pipe B.
And thirdly, drilling a grouting hole by using a drilling machine according to the position set in the step one, and using a slurry protecting wall in the process of drilling the grouting hole to prevent hole collapse. The bottom elevation of the grouting hole is consistent with the theoretical calculation or numerical simulation result.
Fourthly, excavating a foundation pit 3 on the inner side of the underground diaphragm wall, measuring the horizontal deformation of the building 2 to be rectified in a segmented mode by using a plurality of instruments such as level gauges or total stations, arranging measuring points of the building to be rectified along the length direction of the building according to measurement specifications, inserting a grouting pipe into a grouting hole at a position corresponding to the horizontal deformation according to the horizontal deformation measurement result of the building when the horizontal deformation exceeds an alarm value established according to the deformation specifications of the related building before engineering construction, and then executing the following grouting process:
firstly, starting grouting from a row of grouting holes far away from a building 2 to be corrected, and as shown in fig. 3, when grouting is performed in grouting pipes in the grouting holes, firstly, grouting is performed through a pipe B of the grouting pipe until the whole grouting holes are filled with the cement slurry;
secondly, injecting water glass through the pipe A of the grouting pipe, so that the water glass and the cement slurry in the length range of the pipe A below the ground surface in the grouting hole are mixed, and sealing the hole; the water cement ratio of the cement paste is preferably 0.6 to 0.7.
And thirdly, injecting double-fluid slurry through a pipe B of the grouting pipe to control the deformation of the soil body. The double-liquid slurry is formed by mixing cement slurry and water glass. The volume ratio of the cement paste to the water glass in the double-liquid slurry is 3. The mixed liquid of the cement paste and the water glass can be quickly solidified in a short time to form strength.
And fourthly, continuously measuring the horizontal deformation recovery condition of the building to be rectified in the grouting process, repeating the first step to the third step, and grouting into the grouting pipes in the grouting holes according to the grouting sequence from far to near from the control area to be rectified until the horizontal deformation of the building to be rectified is reduced to be below an alarm value.
The deviation rectification object of the implementation method is suitable for various building structures such as tunnels, subway stations, foundation pit support structures and the like, and has the advantages of wide application range, good deformation control effect and small reaction force on the foundation pit.
When grouting is completed and the final horizontal displacement effect is shown in fig. 4, after grouting is completed according to the grouting sequence, the influence on the structural displacement of the foundation pit side is small (as shown by a curve on the left side of a grouting hole), and the influence effect on the region to be regulated is obvious (as shown by a curve on the right side of the grouting hole).
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (4)
1. The implementation method for actively controlling the deformation of the building by multi-row grouting is characterized by comprising the following steps of:
obtaining the number and the positions of a plurality of rows of grouting holes between a building to be rectified and a foundation pit and the range of grouting expansion areas in the grouting holes through theoretical calculation or numerical simulation calculation, wherein the plurality of rows of grouting holes are arranged into two rows, three rows or more according to theoretical calculation or numerical simulation results;
preparing grouting pipes, wherein each grouting pipe consists of a pipe A and a pipe B which are bound together, the axes of the pipe A and the pipe B are parallel, the top surfaces of the pipe A and the pipe B are flush, the length of the pipe B is greater than that of the pipe A, and the area between the bottom wall of the pipe B and the bottom wall of the pipe A is a grouting expansion area;
step three, drilling a grouting hole by using a drilling machine according to the position set in the step one, and using slurry to protect a wall in the process of drilling the grouting hole;
fourthly, excavating a foundation pit on the inner side of the underground diaphragm wall, measuring the horizontal deformation of the building structure to be rectified in a segmented mode by using an instrument, inserting a grouting pipe into a grouting hole in the position corresponding to the horizontal deformation according to the horizontal deformation measuring result of the building structure when the horizontal deformation exceeds an alarm value set before engineering construction, and then executing the following grouting process:
the method comprises the following steps that firstly, grouting is started from a row of grouting holes far away from a building structure to be corrected, and when grouting is conducted in grouting pipes in the grouting holes, cement slurry is injected through a pipe B of the grouting pipes until the whole grouting holes are filled with the cement slurry;
secondly, injecting water glass through the pipe A of the grouting pipe, so that the water glass and the cement slurry in the length range of the pipe A below the ground surface in the grouting hole are mixed, and sealing the hole;
thirdly, injecting double-fluid slurry through a pipe B of the grouting pipe; the double-liquid slurry is prepared by mixing cement slurry and water glass;
and fourthly, continuously measuring the horizontal deformation recovery condition of the building to be rectified in the grouting process, repeating the first step to the third step, and grouting into the grouting pipes in the grouting holes according to the grouting sequence from far to near from the control area to be rectified until the horizontal deformation of the building to be rectified is reduced to be below an alarm value.
2. The method of claim 1, wherein the method comprises the steps of: the water-cement ratio in the cement paste is 0.6-0.7.
3. The method for implementing multi-row grouting active control building deformation according to claim 1 or 2, characterized in that: the volume ratio of the cement paste to the water glass in the double-liquid slurry is 3.
4. The method of claim 3, wherein the method comprises the steps of: the connecting line of the centers of each row of grouting holes is parallel to the axial direction of the building to be corrected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211191743.2A CN115821997A (en) | 2022-09-28 | 2022-09-28 | Construction method for actively controlling deformation of building through multi-row grouting |
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| CN202211191743.2A CN115821997A (en) | 2022-09-28 | 2022-09-28 | Construction method for actively controlling deformation of building through multi-row grouting |
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| CN115821997A true CN115821997A (en) | 2023-03-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116641391A (en) * | 2023-07-27 | 2023-08-25 | 中国建筑第六工程局有限公司 | Double-row bag type grouting method for controlling deformation of foundation pit approaching tunnel |
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- 2022-09-28 CN CN202211191743.2A patent/CN115821997A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116641391A (en) * | 2023-07-27 | 2023-08-25 | 中国建筑第六工程局有限公司 | Double-row bag type grouting method for controlling deformation of foundation pit approaching tunnel |
| CN116641391B (en) * | 2023-07-27 | 2023-10-10 | 中国建筑第六工程局有限公司 | Double-row bag type grouting method for controlling deformation of foundation pit approaching tunnel |
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