CN115874604A - Method for controlling deformation of building by combined use of grouting and partition wall - Google Patents
Method for controlling deformation of building by combined use of grouting and partition wall Download PDFInfo
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- CN115874604A CN115874604A CN202211191720.1A CN202211191720A CN115874604A CN 115874604 A CN115874604 A CN 115874604A CN 202211191720 A CN202211191720 A CN 202211191720A CN 115874604 A CN115874604 A CN 115874604A
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Abstract
The invention discloses a method for controlling deformation of a building by combined use of grouting and a partition wall, which comprises the following steps: obtaining the position and the number of grouting holes, the range of a grouting expansion area in the grouting holes, the position and the burial depth of the partition wall through theoretical calculation or numerical simulation; preparing grouting pipes, wherein each grouting pipe consists of a pipe A and a pipe B which are bound together, and the area between the bottom wall of the pipe B and the bottom wall of the pipe A is a grouting expansion area; a groove is formed in the ground at the position of a preset isolation wall, and then the isolation wall is poured in the groove; drilling a grouting hole by a drilling machine according to a set position; digging a foundation pit on the inner side of the partition wall, measuring the horizontal deformation of the building structure to be corrected by using an instrument in a segmented manner, and inserting a grouting pipe into a grouting hole at a position corresponding to the horizontal deformation for grouting according to the horizontal deformation measurement result when the horizontal deformation exceeds a set alarm value. The method can effectively increase the control effect on the building to be rectified and reduce the deformation of other buildings.
Description
Technical Field
The invention relates to an underground engineering construction method, in particular to an implementation method for controlling deformation of buildings such as tunnels in the construction process.
Background
Taking the process of excavation of a foundation pit as an example, the unloading action of the soil body can cause the deformation of the foundation pit support structure, and the displacement deformation of the adjacent building structures is caused. For the subway tunnel, when the tunnel is located the foundation ditch side, the off-load of the soil body excavation in the hole can lead to the tunnel uplift outside the hole, simultaneously, foundation ditch envelope's lateral deformation can lead to tunnel bottom soil body loss, causes the tunnel to sink then, and these deformations can lead to subway shield tunnel or station structure to produce big deformation, even arouse the situation of serious diseases such as section of jurisdiction fracture, wall body fracture and percolating water.
Taking a subway tunnel as an example, necessary control measures are often required to reduce the influence of foundation pit construction on the adjacent existing tunnel. The existing deformation control measures are divided into passive control measures and active control measures. Although passive control measures are beneficial to reducing tunnel deformation, engineering practices show that the passive measures are generally determined in advance before foundation pit excavation, tunnel deformation cannot be actively and timely controlled in the foundation pit excavation process, the construction cost of the foundation pit is generally remarkably increased, the construction period is remarkably prolonged, and in addition, mm-level deformation control of adjacent operated tunnels is difficult to realize through a single passive measure.
Grouting is an important and common active control measure of deformation in construction. At present, more researches on grouting and lifting of existing buildings or tunnels are carried out, less researches on grouting and controlling horizontal deformation of tunnels are carried out, and a system grouting strategy for controlling horizontal deformation of tunnels is lacked. In the actual construction process, when the deformation of the building to be regulated is larger, the effect of controlling the tunnel deformation by grouting can be enhanced by increasing the grouting amount or using a plurality of rows of grouting holes, but the threat of the grouting process to other nearby buildings or a foundation pit supporting structure is larger at the moment. As a passive control measure, the effect of controlling tunnel deformation by combined use of grouting and a partition wall has not been studied yet.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for controlling the deformation of a building by using a separation wall and grouting in a combined way. The method can increase the effect of deformation control, effectively reduce the adverse effect on the other side of the deviation-correcting area, and realize the high efficiency and economy of the deformation control.
To solve the above-described problems, the following technical solutions are provided.
The invention discloses a method for controlling deformation of a building by combined use of grouting and a partition wall, which comprises the following steps:
before or during excavation of a foundation pit, obtaining the position and the number of grouting holes between the foundation pit and a building to be rectified, the range of a grouting expansion area at the lower part in the grouting holes, and the position and the burial depth of a partition wall between the foundation pit and 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 a grouting expansion area is arranged between the bottom wall of the pipe B and the bottom wall of the pipe A;
step three, grooving on the ground at the position of a preset partition wall, and then pouring the partition wall in the grooving, wherein the partition wall is arranged in parallel to the building, the distance between the outer wall of one side of the partition wall, which is close to the building, and the center line of a grouting hole is 1-2 m, and the partition wall is a cement mixing wall;
drilling a grouting hole by using a drilling machine according to the set position, wherein the drilling hole adopts a slurry protection wall;
fifthly, digging a foundation pit at the inner side of the partition wall, measuring the horizontal deformation of the building to be rectified through an instrument in a segmented mode according to measuring points arranged on the building to be rectified, inserting a grouting pipe into a grouting hole at a position corresponding to the horizontal deformation according to the horizontal deformation result of the building to be rectified obtained through actual measurement when the horizontal deformation exceeds an alarm value set before the foundation pit is constructed, and executing the following grouting process to reduce the horizontal deformation of the building to be rectified to be below the alarm value:
injecting cement slurry through a pipe B until the cement slurry flows out of the grouting hole so as to ensure that the whole grouting hole is filled with the cement slurry;
step two, injecting water glass through the pipe A, mixing cement slurry and the water glass within the length range of the pipe A below the ground surface in the injection hole, and sealing the hole;
and thirdly, injecting double-liquid slurry through the pipe B to control the deformation of the soil body, wherein the double-liquid slurry is prepared by uniformly mixing cement slurry and water glass.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention combines the isolation wall and the grouting method, can improve the control effect on the object to be rectified, because the rigidity of the isolation wall is larger than that of the soil body, the isolation wall has counter-force effect on grouting, can increase the control effect on the building to be rectified, and simultaneously has shielding effect, and can reduce the deformation of other building structures at the periphery.
2. Compared with the measure of using grouting or a partition wall independently, when the deviation correcting object reaches the same state, the method can reduce the total amount of the used slurry, and is economic and environment-friendly.
3. In the deformation control measures, the structure on the other side of the deviation correcting object can be deformed only by adopting grouting measures, the existing deformation cannot be actively recovered only by adopting the partition wall, and the deformation of the other side, such as a foundation pit support structure or other building structures, can be reduced by jointly using grouting and the partition wall, the deformation effect of the deviation correcting object is increased, and the regulation and control efficiency is higher compared with that of using a single measure.
Drawings
FIG. 1 is a sectional layout view of the combined use of grouting and partition walls;
FIG. 2 is a plan view of a single row grouting and partition wall combination;
FIG. 3 is a plan view of a multi-row grouting and partition wall combination;
FIG. 4 is a schematic view of a grout pipe arrangement;
FIG. 5 is a comparison graph of horizontal displacement of soil bodies or partition walls on two adjacent sides caused by grouting when the partition walls exist and do not exist;
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 design idea of the invention is that the reverse effect and the shielding effect of the isolation wall are utilized, the positions and the number of grouting holes and the position of the isolation wall are determined according to the deformation condition of the object to be corrected and the position conditions of other nearby buildings and by combining the results of theoretical calculation and numerical simulation, so that the control effect on the object to be corrected is increased, and the influence on other nearby structures is reduced.
A method of controlling deformation of a building structure using a combination of grouting and a partition wall of the present invention as shown in the accompanying drawings, comprising the steps of:
step one, calculating the positions and the number of grouting holes between a foundation pit 4 and a building 1 to be corrected, the range of a grouting expansion area 2 at the lower part of the grouting holes and the positions and the burial depth of a partition wall 3 between the foundation pit 4 and the grouting holes through theoretical calculation or numerical simulation (for example, software such as PLAAXIS 2D/3D or FLAC 3D) before or in the process of excavating the foundation pit; the grouting holes can be arranged into a single row or multiple rows according to actual regulation and control requirements and reference calculation results, and the multiple rows of holes can be arranged into two rows, three rows or more according to theoretical calculation or numerical simulation results. Preferably, the connecting line of the centers of each row of grouting holes is parallel to the axial direction of the building to be rectified, and the hole diameter 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, a grouting expansion area 2 is arranged between the bottom wall of the pipe B and the bottom wall of the pipe A, and the size of the grouting expansion area can be controlled by adjusting the lengths of the pipe A and the pipe B. Preferably, the length of the pipe B is 4-6 m greater than that of the pipe A.
And step three, grooving on the ground at the position of a preset isolation wall 3, and pouring the isolation wall 3 in the grooving, wherein the isolation wall is arranged in parallel to the building, the distance between the outer wall of one side of the isolation wall, which is close to the building, and the center line of a grouting hole is 1-2 m, and the closer the distance between the isolation wall and a grouting body is, the more obvious the deformation regulation and control effect on the object to be corrected is, and the less adverse effect on the building on the other side is.
The isolation wall is a cement soil mixing wall. Preferably, profile steel can be inserted into the partition wall according to engineering requirements so as to improve the strength and the rigidity, the thickness of the partition wall is 1m, and the length of the partition wall is consistent with the length of each row of grouting holes and the longitudinal length range of the grouting holes.
And fourthly, drilling the grouting holes by using a drilling machine according to the set position, wherein the drilling holes adopt slurry retaining walls to prevent hole collapse, and the bottom elevation of the grouting holes is consistent with the theoretical calculation or numerical simulation result.
Fifthly, excavating a foundation pit 4 on the inner side of the isolation wall, measuring horizontal deformation of the building to be rectified in sections through instruments such as a total station or a level gauge and the like according to measuring points arranged on the building to be rectified 1, inserting a grouting pipe into a grouting hole at a position corresponding to the horizontal deformation according to a horizontal deformation result of the building to be rectified obtained through actual measurement when the horizontal deformation exceeds an alarm value set before foundation pit construction, and executing the following grouting process to reduce the horizontal deformation of the building to be rectified to be below the alarm value:
injecting cement slurry through a pipe B until the cement slurry flows out of the grouting hole so as to ensure that the whole grouting hole is filled with the cement slurry;
step two, injecting water glass through the pipe A, mixing cement slurry and the water glass within the length range of the pipe A below the ground surface in the injection hole, and sealing the hole; the water-cement ratio of the cement paste is preferably 0.6-0.7;
and thirdly, injecting double-liquid slurry through a pipe B to control the deformation of the soil body.
The injection holes may be arranged in a single row or multiple rows, with the injection holes arranged in multiple rows being positioned as shown in fig. 3.
The double-fluid slurry is formed by mixing cement slurry, water glass and the like. The volume ratio of cement slurry to water glass in the dual slurry is preferably 3:1. The mixed liquid of the cement paste and the water glass can be quickly solidified in a short time to form strength.
The building structure to be rectified in the method can be a tunnel, a foundation pit support structure or other building structures.
As shown in fig. 4, as an embodiment of the present invention, the grouting pipe is a steel pipe, the length of the B pipe is slightly greater than the depth of the drilled hole, the top of the a pipe is flush with the B pipe, the diameter of the drilled hole is 50mm, and the bottom of the a pipe is a grouting expansion area, and the size of the grouting expansion area can be controlled by adjusting the lengths of the a pipe and the B pipe.
As shown in fig. 5, according to the numerical simulation result, under the condition that the partition wall is present on the right side of the grouting body, the grouting area expands more to the left side (tunnel side) after grouting, that is, the partition wall has a counterforce effect, so that the effect of controlling the building structure to be corrected by grouting is enhanced, and the using amount of grouting materials can be reduced; on the right side (foundation pit side) of the grouting body, the horizontal displacement of the partition wall is smaller and more uniform than the horizontal displacement of the soil body at the corresponding position when the partition wall does not exist, and the reason is that the rigidity of the partition wall is larger than the rigidity of the soil body, so that the partition wall has a shielding effect on the grouting, and the influence on the foundation pit on the other side is reduced.
Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the invention as claimed.
Claims (6)
1. A method of controlling deformation of a building structure using a combination of grouting and a partition wall, comprising the steps of:
before or during excavation of a foundation pit, obtaining the position and the number of grouting holes between the foundation pit and a building to be rectified, the range of a grouting expansion area at the lower part in the grouting holes, and the position and the burial depth of a partition wall between the foundation pit and 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 a grouting expansion area is arranged between the bottom wall of the pipe B and the bottom wall of the pipe A;
thirdly, grooving on the ground at the position of a preset isolation wall, and pouring the isolation wall in the grooving, wherein the isolation wall is arranged in parallel to the building, the distance between the outer wall of one side of the isolation wall, which is close to the building, and the center line of a grouting hole is 1-2 m, and the isolation wall is a cement mixing wall;
drilling a grouting hole by using a drilling machine according to the set position, wherein the drilling hole adopts a slurry protection wall;
fifthly, excavating a foundation pit at the inner side of the partition wall, measuring the horizontal deformation of the building to be corrected through an instrument in a segmented mode according to measuring points arranged on the building to be corrected, inserting a grouting pipe into a grouting hole in the position corresponding to the horizontal deformation according to the horizontal deformation result of the building to be corrected, which is obtained through actual measurement, when the horizontal deformation exceeds the alarm value set before the construction of the foundation pit, and executing the following grouting process to reduce the horizontal deformation of the building to be corrected to be below the alarm value:
injecting cement slurry through a pipe B until the cement slurry flows out of the grouting hole so as to ensure that the whole grouting hole is filled with the cement slurry;
secondly, injecting water glass through the pipe A, mixing the water glass with cement slurry in the length range of the pipe A below the ground surface in the grouting hole, and sealing the hole;
and thirdly, injecting double-liquid slurry through the pipe B to control the deformation of the soil body, wherein the double-liquid slurry is prepared by uniformly mixing cement slurry and water glass.
2. The method of controlling deformation of a construction structure using a grouting in combination with a partition wall according to claim 1, characterized in that: the grouting holes are arranged in a single row or multiple rows, the connecting line of the centers of the grouting holes in each row is parallel to the axial direction of the building structure to be corrected, and when the grouting holes are arranged in multiple rows, the fourth step is executed after the fifth and the third steps: and in the grouting process, repeating the first step to the third step repeatedly, and grouting the grouting pipes in the grouting holes in each row according to the grouting sequence from far to near to the building structure to be corrected until the horizontal deformation of the building structure to be corrected is reduced to be below an alarm value.
3. A method of controlling deformation of a building structure using a grouting and partition wall in combination according to claim 1 or 2, characterised in that: the water-cement ratio of the cement paste is 0.6-0.7.
4. The method of controlling deformation of a construction structure using a grouting in combination with a partition wall according to claim 1, characterized in that: the volume ratio of the cement paste to the water glass in the double-liquid slurry is 3:1.
5. The method of controlling deformation of a construction structure using a combination of grouting and a partition wall according to claim 4, characterized in that: the length of the pipe B in each grouting pipe is 4-6 m greater than that of the pipe A.
6. The method for controlling deformation of a structure using a combination of grouting and a partition wall according to claim 5, wherein: the steel section is inserted into the isolation wall, the thickness of the isolation wall is 1m, and the length of the isolation wall is consistent with the longitudinal length range of each row of grouting holes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211191720.1A CN115874604A (en) | 2022-09-28 | 2022-09-28 | Method for controlling deformation of building by combined use of grouting and partition wall |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211191720.1A CN115874604A (en) | 2022-09-28 | 2022-09-28 | Method for controlling deformation of building by combined use of grouting and partition wall |
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| CN115874604A true CN115874604A (en) | 2023-03-31 |
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| CN202211191720.1A Pending CN115874604A (en) | 2022-09-28 | 2022-09-28 | Method for controlling deformation of building by combined use of grouting and partition wall |
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