CN112081156A

CN112081156A - Grouting reinforcement lifting method for frame structure building

Info

Publication number: CN112081156A
Application number: CN201910518706.XA
Authority: CN
Inventors: 崔学栋; 吴继光; 崔腾跃
Original assignee: Beijing Hengxiang Hongye Foundation Reinforcement Technology Co Ltd
Current assignee: Beijing Hengxiang Hongye Foundation Reinforcement Technology Co Ltd
Priority date: 2019-06-15
Filing date: 2019-06-15
Publication date: 2020-12-15
Anticipated expiration: 2039-06-15
Also published as: CN112081156B

Abstract

The invention relates to a grouting reinforcement lifting method for a frame structure building, which comprises the following steps: arranging measuring points: respectively arranging measuring points at positions corresponding to the stand columns on the building, calculating the average value of the settlement of each measuring point, taking the average value as a reference value, taking a point larger than the reference value as a lifting point, taking the maximum settlement point as s1, and taking the measuring point which is close to the average value h and is closest to s1 as a reference zero point s 0; laying lifting holes: a lifting hole is formed in the position, corresponding to the lifting point, of the outer side of the building; determining the lifting height: setting the design lifting height of s1 as d, wherein d is smaller than h1, and then setting the connecting line of s0 and s1 elevation as a lifted final height line k 0; grouting and lifting: the lifting principle is that pressure grouting lifting is adopted in the soil layer at the bottom of the upright from the area with large sedimentation amount to the area with small sedimentation amount. The invention not only reinforces the building foundation, but also realizes the lifting and leveling of the building, and has the advantages of controllable lifting speed, high stability and small disturbance.

Description

Grouting reinforcement lifting method for frame structure building

Technical Field

The invention relates to the technical field of building grouting lifting, in particular to a method for grouting, reinforcing and lifting a frame structure building.

Background

The building is a frame structure, the frame structure is formed by connecting beams and columns in a rigid connection or a hinged connection mode, and a bearing system structure is formed, namely the beams and the columns form a frame to resist horizontal loads and vertical loads in the using process, and the building wall of the structure is not bearing and only plays roles in enclosing and separating. The general frame structure has the form of independent foundation and the bottom of the frame structure is also provided with a ground beam as a support. Due to reasons such as building reconnaissance, design, construction or bad weather, the building can sink because of the foundation intensity is not enough. When the building is settled, the frame structure is deformed to cause stress redistribution, and the wall body is generally cracked. At this time, the building needs to be subjected to a lifting reinforcement process.

At present, the existing lifting method generally adopts polyurethane grouting for lifting. The polyurethane grouting method is characterized in that polyurethane foam reaction raw materials are injected into a foundation, the reinforced soil body is filled, permeated, compacted, replaced and reinforced through huge expansion pressure and cementing action generated by polyurethane foam reaction, and meanwhile, the construction object which has undergone uneven settlement is rectified. However, because the expansion force generated by the polyurethane foam is not uniform, the lifting height and speed are not easy to control, and the lifting process is easy to cause secondary damage to the building. Therefore, a set of lifting method needs to be researched, so that the lifting of the frame structure building can be realized, and the secondary damage to the building can be reduced.

Disclosure of Invention

The invention aims to provide a grouting reinforcement lifting method for a frame structure building, which lifts the building according to a linear relation by a grouting process, not only reinforces the building foundation, but also realizes the lifting and leveling of the building, and can reduce the secondary damage to the building as much as possible.

The above object of the present invention is achieved by the following technical solutions:

a method for grouting, reinforcing and lifting a frame structure building comprises the following steps:

s1, arrangement measuring point: measuring points are respectively arranged on the building corresponding to the positions of the stand columns, the average value h of the building settlement is calculated according to the measured elevation of the measuring points, and the average value h is used as a reference value; setting a measuring point with the largest sedimentation amount as s1, setting a measuring point which is close to the average value h and is closest to s1 as a reference zero point s0, setting measuring points from s1 to s0 as lifting points which are numbered as s2 and s3 … … sn in sequence, and setting sedimentation amounts of each lifting point compared with the average value h as h1 and h2 … … hn in sequence;

s2, arranging lifting holes: arranging a lifting hole in the side surface of an upright post to be lifted of a building, and inserting a grouting pipe into the lifting hole;

s3, determining the lifting height: firstly, setting the design lifting height of s1 as d, wherein d is smaller than h 1; then setting a connecting line of the elevations of s0 and s1 as a lifted final height marking line k0, and setting elevation difference values of the positions, corresponding to the lifting points and the final height marking line k0, of the lifting points as designed lifting heights of the lifting points s2 and s3 … … sn, wherein the designed lifting heights are H2 and H3 … … Hn respectively;

s4, grouting and lifting: the lifting principle is that pressure grouting lifting is adopted in a soil layer at the bottom of the upright post from an area with large sedimentation amount to an area with small sedimentation amount, and injected double-slurry reaches a slurry outlet at the bottom of the grouting pipe through different channels of the grouting pipe, is mixed and permeates into the soil body, and is solidified within 5-60 s; grouting and lifting s1, when the slope of a connecting line k1 between the elevation of s1 and the elevation of s2 is the same as that of k0, grouting the lifting hole corresponding to s2, and synchronously lifting s1 and s 2;

when the slope of a connecting line k2 between the elevation of s1 and the elevation of s3 is the same as that of k0, grouting is carried out on the lifting hole corresponding to s3, and s1, s2 and s3 are lifted synchronously;

and (4) circulating the processes, grouting and lifting the s4 … … sn, and stopping grouting when the elevations of s1, s2 and s3 … … sn are lifted to the lifting position required by the final elevation line k 0.

By adopting the technical scheme, the elevation of the lifting point is lifted to the final elevation line k0, a certain settlement amount is reserved, and secondary damage to the filling structure caused by lifting to be completely horizontal is avoided; in the lifting process, the slope of a connecting line of the elevation of each lifting point in each lifting is controlled not to exceed the slope of k0, so that secondary damage to the filling structure in the lifting process is avoided; in addition, the lifting speed is controllable by adopting a grouting lifting process, the lifting is prevented from being ultrahigh, the soil body at the bottom of the column foundation is reinforced after grouting, and the later-stage secondary sedimentation is avoided.

The invention is further configured to: in step S3, d is 1/2-2/3 of h 1.

By adopting the technical scheme, when the lifting value is set in the range, the secondary damage to the internal filling structure is minimum.

The invention is further configured to: in the grouting lifting process, intermittent grouting lifting is adopted, after grouting lifting is carried out for a certain height, the grouting lifting is suspended for a certain time so that the building structure can adapt, and then grouting lifting is carried out for a certain height.

By adopting the technical scheme, the building is lifted by intermittent grouting and then suspended, so that the stress in the building is redistributed, and after the building adapts to the stress after lifting, the building is lifted by grouting for a section of height, thereby further reducing the secondary damage to the building during lifting and ensuring the structural stability of the building.

The invention is further configured to: the pause time is 12-24 hours.

By adopting the technical scheme, the building is sufficiently stable within the time range, secondary damage is avoided, the overall construction efficiency is high, and the period is short.

The invention is further configured to: and in the grouting lifting process, monitoring the elevation of each lifting point.

By adopting the technical scheme, the elevation of each lifting point is monitored in real time, the preset lifting value is avoided being exceeded, the lifting of each point is kept synchronous, and secondary damage is reduced.

The invention is further configured to: adopt laser linkage alarm device, laser linkage alarm device includes laser emitter and laser receiver, installs laser receiver in the relevant position of stand according to the lifting value of setting for every lifting point, sets up laser emitter in the outside elevation of building not receive slip casting lifting influence department, and after laser receiver was launched to laser emitter's transmission infrared ray, laser receiver can send out the alarm sound, at this moment, slows down or stops the slip casting.

Through adopting above-mentioned technical scheme, utilize optical instrument to measure, compare the surveyor's level and measured and reduced work load, and report to the police more timely.

The invention is further configured to: the laser receiver has certain warning interval, and the lifting slip casting in-process, laser receiver rise along with the stand, and when being close to the settlement elevation, the laser swinger began to report to the police, and at this moment, the slip casting speed slows down to adopt the spirit level to carry out the elevation measurement, carry out real time monitoring.

By adopting the technical scheme, the lifting speed is monitored by adopting a means of combining the laser receiver and the manual leveling measurement, and the comprehensive effect of more timely reaction and more accurate measurement is achieved.

The invention is further configured to: grouting lift includes two grouting stages: in the first stage, a grouting pipe extends into a soil body at the bottom of a column foundation to perform grouting, and slurry and the soil body are mixed to form a reinforcement body; and the grouting pipe in the second stage is inserted into the part of the reinforcing body close to the stand column foundation from the lifting hole, pressure grouting is carried out, and the stand column is lifted by using the reinforcing body as a bearing layer.

Through adopting above-mentioned technical scheme, utilize the reinforcement body to compare as the holding power layer and utilize existing soil layer as the holding power layer, produce ascending lift more at the uniform velocity controllable during the slip casting, more be favorable to the lifting work to go on.

The invention is further configured to: when a reinforcing body is formed by grouting in the first stage, a drilling and grouting integrated layered grouting mode is adopted, and the length of each grouting section is 0.3-0.5 m.

By adopting the technical scheme, the drilling and grouting integrated machine can drill one section and reinforce one section, so that the disturbance to the soil body in the drilling and grouting process is reduced, and the occurrence of secondary settlement of the stand column is effectively prevented.

In conclusion, the beneficial technical effects of the invention are as follows:

1. the elevation of the lifting point is lifted to the final elevation line k0, a certain settlement amount is reserved, and secondary damage to the filling structure after the elevation is completely horizontal is avoided; in the lifting process, the slope of a connecting line of the elevation of each lifting point in each lifting is controlled not to exceed the slope of k0, so that secondary damage to the filling structure in the lifting process is avoided; in addition, the lifting speed is controllable by adopting a grouting lifting process, the lifting is prevented from being ultrahigh, and the soil body at the bottom of the upright post foundation is reinforced after grouting, so that the occurrence of later-stage secondary sedimentation is avoided;

2. in the lifting process, the lifting speed is monitored by adopting a means of combining a laser receiver and manual leveling measurement, so that the comprehensive effect of more timely reaction and more accurate measurement is achieved;

3. during lifting, intermittent grouting lifting is adopted, the building is lifted firstly and then suspended, so that the stress in the building is redistributed, and after the building adapts to the stress after lifting, the building is grouted and lifted for a certain height, thereby avoiding secondary damage to the building during lifting and ensuring the structural stability of the building;

4. compared with the prior art that the existing soil layer is used as the supporting layer, the reinforcing body is used as the supporting layer, so that the upward lifting force generated during grouting is more uniform and controllable, and the lifting work is more favorably carried out;

5. the drilling and grouting integrated machine is used for drilling one section and reinforcing one section, so that the disturbance to the soil body in the drilling and grouting process for forming the reinforcing body is reduced, and the secondary settlement of the stand column is effectively prevented.

Drawings

FIG. 1 is a top view of a frame structure with the maximum settlement point occurring at a corner of a building;

FIG. 2 is a top view of the frame structure with the maximum settlement point occurring at an intermediate position on one side of the building;

FIG. 3 is a graph showing the relative settling value of each lifting point compared to a reference zero point;

FIG. 4 is a schematic diagram of the final plot line k0 and the corresponding design lift values for each lift point;

FIG. 5 is a schematic diagram of the relationship between line k1 and line k0 during lift;

FIG. 6 is a schematic diagram of the relationship between line k2 and line k0 during lifting;

FIG. 7 is a schematic diagram of the relationship between line k3 and line k0 during lift;

FIG. 8 is a schematic diagram of the operation of the laser linkage alarm device;

FIG. 9 is a top view of the columns with grouting holes for reinforcement and lifting on both sides;

fig. 10 is a schematic sectional view of the bottom of the column foundation forming the reinforcement and the lifting grouting area.

In the figure, 1, independent basis; 2. a column; 3. lifting the hole; 4. reinforcing the body; 41. grouting layer sections; 5. a laser transmitter; 6. a laser receiver.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A grouting reinforcement lifting method for a frame structure building is disclosed, referring to fig. 1 and 2, which are plan schematic views of the frame structure building according to the present invention, wherein an independent foundation 1 is arranged below a column 2, wherein the numbers s1, s2 (s 2 '), s3 (s 3'), and s4 are the columns 2 to be lifted, and the settling amount of s1 is the largest. Fig. 1 shows a case where the maximum settlement is made at the corner of the building, and fig. 2 shows a case where the column 2 having the maximum settlement is placed at the middle position of one side of the building.

The grouting reinforcement lifting method comprises the following steps:

s1, arrangement measuring point: measuring points are respectively arranged on the building corresponding to the positions of the upright posts 2, the average value h of the building settlement is calculated according to the measured elevation of the measuring points, and the average value h is used as a reference value; setting a measuring point with the largest sedimentation amount as s1, setting a measuring point which is close to the average value h and is closest to s1 as a reference zero point s0, setting measuring points from s1 to s0 as lifting points which are numbered as s2 and s3 … … sn in sequence, and setting sedimentation amounts of each lifting point compared with the average value h as h1 and h2 … … hn in sequence (as shown in FIG. 3);

s2, arranging the lifting holes 3: with reference to fig. 2 and 9, a lifting hole 3 is formed in a side surface of a column 2 to be lifted in a building, and a grouting pipe is inserted into the lifting hole 3. The lifting holes 3 may be symmetrically arranged on both sides of the upright (shown in fig. 9), or only 1 lifting hole may be arranged, the direction of the lifting hole 3 is inclined downwards, and the bottom end extends to a position right below the upright (this is not shown in the figure).

S3, determining the lifting height: as shown in FIG. 4, first set the design lift height of s1 to d, where d is less than h1, which may be 1/2-2/3 of h 1; then, a connecting line of the elevations of s0 and s1 is set as a lifted final height marking line k0, and the elevation difference value of the lifting point corresponding to the final height marking line k0 is set as the designed lifting height of the lifting point s2 and the lifting point s3 … … sn, which are respectively H2 and H3 … … Hn.

S4, grouting and lifting: the lifting principle is that pressure grouting lifting is adopted in the soil layer at the bottom of the upright post 2 from the area with large sedimentation amount to the area with small sedimentation amount, and the injected double-slurry reaches a slurry outlet at the bottom of the grouting pipe through different channels of the grouting pipe, is mixed and permeates into the soil body, and is solidified within 5-60 s; as shown in fig. 5, grouting to s1, when the slope of a connecting line k1 between the elevation of s1 and the elevation of s2 is the same as that of k0, grouting to the lifting hole 3 corresponding to s2, and lifting to s1 and s2 synchronously;

as shown in fig. 6, when the slope of a connection line k2 between the elevation of s1 and the elevation of s3 is the same as that of k0, grouting is performed to the lifting hole 3 corresponding to s3, so that s1, s2 and s3 are lifted synchronously;

referring to fig. 7, the above process is circulated to sequentially inject slurry to s4 … … sn for lifting, and when the elevation of s1, s2 and s3 … … sn is lifted to the lifting position required by the final height line k0, the slurry injection is stopped.

When the frame structure building is settled, the settlement of each of the columns 2 is irregular as shown in fig. 3 in general. The wall between the two columns 2 and the filling structures such as the installed doors and windows and the like can deform. The construction method starts from the stress performance and the structural form of the frame structure, and mainly has the following invention points:

one is that all the uprights 2 are not raised to exactly the same height (d is less than h 1), but a certain amount of settling is maintained according to line k0, thus reducing the secondary damage to the filling structure between the uprights 2. Because the frame construction building takes place to subside the back, inside filling structure itself has the process of adaptation, can produce certain deformation according to the trend of subsiding to reach stable state, if with stand 2 complete lifting to whole unified height, the lifting in-process, filling structure can send out serious secondary and destroy, the crack that for example originally produces can seriously grow, rather than diminishing.

And secondly, before grouting lifting, setting a k0 line, starting from the maximum sedimentation point in the lifting process, starting grouting lifting work of a nearby point whenever the slope of the lines k1, k2 … … and the like is the same as that of the line k0, and then synchronously lifting multiple points. Ensures that the secondary damage of the structure caused by the relative height relationship of each lifting point exceeding the set slope of the k0 line in the lifting process can not be caused.

Thirdly, the injected slurry is quickly solidified, the column 2 is stably lifted along with the continuous injection of the slurry, and when the grouting is stopped, the lifting is stopped.

Preferably, intermittent grouting lifting is adopted during each lifting, grouting lifting is firstly carried out for a certain height, grouting is suspended for a certain time, then grouting is carried out for a certain height, and the suspending time is generally 12-24 hours. And the intermittent grouting lifting is realized by firstly lifting the building, then suspending to redistribute the stress in the building, and grouting and lifting for a section of height after the building is adaptive to the stress after lifting, so that the secondary damage to the building during lifting is avoided, and the structural stability of the building is ensured.

Referring to fig. 8, when lifting points are lifted, the height of each lifting point should be monitored in real time. The elevation monitoring adopts a laser linkage alarm device which can be a Lesai LS515II automatic leveling laser swinger, and the laser linkage alarm device comprises a laser transmitter 5 and a laser receiver 6. During installation, the laser receiver 6 is installed on the upright post 2, and the laser transmitter 5 is arranged at a position outside the building, where the elevation of the building is not affected by grouting lifting. When the laser device is used, the height difference between the laser transmitter 5 and the laser receiver 6 is adjusted (namely, the height difference refers to the required lifting height), and after the infrared rays emitted by the laser transmitter 5 are emitted to the laser receiver 6, the laser receiver 6 can give out a dripping alarm sound. And (3) indicating that the lifting height reaches or is about to reach, gradually reducing grouting pressure, slowly grouting to ensure that the foundation is uniformly and slowly lifted, and further determining the lifting height by combining with the data measured by the level gauge so as to ensure that the lifting height of the building is controllable in the lifting process.

In addition, the laser receiver 6 can also be arranged on the upright post 2 beside the upright post 2 which is being lifted, the height is 2-3mm lower than that of the signal of the laser emitter 5, when the adjacent lifting point is lifted in the lifting process, the laser receiver 6 can also send out an alarm signal, and at the moment, the lifting speed can be reduced or grouting can be suspended.

As shown in fig. 9, the independent foundation 1 on both sides of the upright 2 is drilled with a water drill to form lifting holes 3, and the lifting holes 3 are uniformly and symmetrically arranged along the vertical center of the independent foundation 1. And (2) drilling and grouting by adopting a drilling and grouting integrated layered grouting mode, inserting a drill rod (namely a grouting pipe) of the drilling and grouting integrated machine into the lifting hole 3, extending into a soil body at the bottom of the foundation of the upright 2, grouting for one section every time when drilling for one section, wherein the length of the grouting section is 0.3-0.5m each time, forming a corresponding grouting interval 41 with the height of 0.3-0.5m, and constructing within a reinforcing range until the construction is completed, wherein the multiple grouting intervals 41 jointly form a reinforcing body 4. The grouting for forming the reinforcing body 4 may be single-component grout or double-grout, for example, a commonly used grout mixed with water glass to shorten the setting time. As shown in fig. 10, after the reinforcement 4 has formed strength, the independent foundation 1 is lifted by grouting (i.e., second stage grouting). And (3) drilling a drill rod from the lifting hole 3 to a position 1-2m below the independent foundation 1, wherein the diameter of the drill rod is 42mm, a double core pipe is adopted, the diameter of an inner core is 12mm, and a grouting drill bit is a double-slurry mixer. And then, carrying out double-slurry grouting, wherein the injected double slurries reach a slurry outlet at the bottom of the grouting pipe through different channels of the grouting pipe, are mixed and permeate into the soil body, and are solidified within 5-60 s. The column 2 is uniformly lifted by the slurry which is continuously injected and solidified, with the reinforcing body 4 as a bearing layer.

The grouting liquid used for grouting adopts two-component composite grout, for convenience, the two-component composite grout is named as grout A and grout B, the two kinds of grout reach the grout outlet of the grouting pipe from different channels of the drill rod respectively, the surrounding soil body is pressed into the grout outlet, chemical reaction occurs after the two kinds of grout are converged in the soil body, and initial setting is completed in a short time.

The grouting liquid may be any one of the prior art as long as it can satisfy the initial setting time requirement and has good permeability.

The following slip casting formula can be adopted: the slurry A consists of the following raw materials in parts by weight: 70-90 parts of metal oxide and/or metal hydroxide, 0.5-1.2 parts of composite retarder, 0.5-0.7 part of water reducing agent, 0.7-1.5 parts of acid-base buffering agent, 3-5 parts of composite stabilizer and 0.5-1.5 parts of composite surfactant. Wherein the metal oxide can be any two of magnesium oxide, aluminum oxide, magnesium phosphate and the like; the composite retarder is at least two of urea, borax and sodium tripolyphosphate; the water reducing agent can be a polycarboxylic acid water reducing agent or a naphthalene water reducing agent; the acid-base buffer is magnesium carbonate or potassium hydroxide; the composite stabilizer is at least two of hydroxymethyl cellulose, n-alkyl cetyl alcohol, starch ether and cellulose ether; the composite surfactant is at least two of alkyl polyoxyethylene ether, benzyl phenol polyoxyethylene ether and alkyl sulfonate. When two or more different materials are used in the above individual components, the two or more different materials can be prepared in an equal order of magnitude, and the two materials are mainly set to prevent one of the materials from failing so as to ensure that the effect of the whole composite slurry is more stable.

The slurry B comprises the following raw materials in parts by weight: 30-40 parts of phosphate and 0.2-1 part of defoaming agent. Wherein the phosphate can be diammonium hydrogen phosphate or potassium dihydrogen phosphate; the defoamer can be a silicone defoamer or a polyether defoamer.

And mixing and stirring the slurry A and the slurry B with water according to the weight ratio of 100: 40-50 to form slurry, pressing the slurry into a grouting pipe through different pipelines, converging the slurry at a slurry outlet, reacting and solidifying in a soil body.

The difference of the initial setting time of the composite slurry is mainly realized by adjusting the specific gravity of the composite retarder.

The following is presented in conjunction with the examples:

in a frame structure building, all the columns 2 are settled, the average value h of settlement of all the columns 2 is 32mm measured before the lifting process, as shown in fig. 1, the column 2 with the largest settlement amount is positioned at one corner of the building and is numbered s1, the settlement amount of the column 2 is 94mm, the measuring points close to the average value h and closest to s1 comprise two reference zero points s0 and s0 ', and the measuring points from s1 to s0 and s 0' are set as lifting points and are numbered s2, s3, s4, s2 'and s 3' in sequence. Hereinafter, the lifting of s1, s2, s3 and s4 is described, and the relevant point of s' is referred to as implementation.

As shown in fig. 3, the settling amount of each lifting point from the average value h is h1=94mm-32mm =62mm, h2=41mm, h3=33mm, h4=18mm in this order. The lifting points are all 3.2m apart from each other.

As shown in fig. 4, the lift height is determined: firstly setting the design lifting height d of s1 to be 40 mm; the line connecting s0 and s1 elevations is then set to the raised final height line k0, (s 0 elevation of 0 mm). The elevation difference values at the corresponding lifting points to the final height mark k0 are set as the designed lifting heights of the lifting points s2, s3 and s4, which are H2 and H3 … … Hn respectively. By an arithmetic operation, H2=41-22 × 3/4=24.5mm, H3=33-22 × 2/4=22mm, and H4=18-22 × 1/4=12.5mm are calculated.

As shown in fig. 5, s1 is grouted and lifted, when the slope of a connecting line k1 between the elevation of s1 and the elevation of s2 is the same as that of k0, the lifting hole 3 corresponding to s2 is grouted, and s1 and s2 are lifted synchronously. Specifically, the lifting times of s1 and the lifting value of each time are firstly drawn up, and before s2 starts lifting, the height of s1 to be lifted is 62-41-22 × 1/4=15.5 mm. In the lifting stage, intermittent grouting lifting is carried out twice, and after the grouting lifting is carried out for 8mm, the lifting is paused for 12 hours so as to adapt to the building structure. Then grouting and lifting for 7.5mm, before lifting, installing a laser receiver 6 on the upright post 2 of s1, and installing a laser swinger at a position (for example, more than 10 m) far away from the periphery of the building and not affected by the lifting, wherein the central alarm position of the laser receiver 6 is 7.5mm lower than a horizontal signal line sent by the laser swinger.

In the lifting grouting process, the laser receiver 6 rises along with the upright post 2, when the elevation is close to a set elevation, the laser leveling instrument starts to give an alarm (interval sound alarm and low frequency), at the moment, the grouting speed (namely the lifting speed) is reduced, the elevation is measured by adopting the level, and real-time monitoring is carried out. When the center of the laser receiver 6 is completely overlapped with a horizontal signal line sent by the laser swinger (swinger high-frequency sound alarm), the lifting is proved to be in place, and grouting operation is stopped. Grouting is suspended for 12 hours.

Then as shown in fig. 6, the slurry is synchronously injected and lifted from the beginning s2 point and the s1 point, and the lifting height is h 2-h 3-1/4 (h 1-d) =41mm-33mm-22 × 1/4=2.5 mm. At this time, the slope of the line k2 connecting the elevation of s1 and the elevation of s3 is the same as k 0. Since the lift value is small, it is possible to choose not to pause and continue the lifting of the grouting at s 3.

As shown in fig. 7, s1, s2, s3 synchronized lift height =33-18-22 × 1/4=9.5 mm. After this lifting, grouting was suspended for 24 hours.

The height of s4 to be lifted is calculated to be =18-22 × 1/4=12.5mm, the laser receivers 6 are arranged on the columns 2 of s1, s2, s3 and s4, the laser swinger (namely the laser emitter 5) is arranged at a position far away from the periphery of the building, the laser swinger can scan 4 laser receivers 6 at the same time, and the central alarm position of the laser receiver 6 is 12.5mm lower than the horizontal signal line sent by the laser swinger.

As shown in fig. 8, in the lifting grouting process, a level gauge is used to monitor and measure each lifting point, and the grouting pressure of different lifting points is adjusted in time, so that the lifting speed is adjusted, and 4 points are kept as synchronous as possible. The level measurement may be one measurement every half hour. The laser receivers 6 rise along with the upright posts 2, the laser swinger continuously rotates, so that laser continuously sweeps to the four laser receivers 6, and when an alarm is heard, at least one upright post 2 is proved to be lifted to an elevation close to the requirement of a k0 line; at this moment, slow down slip casting speed to adopt the spirit level to carry out the elevation measurement, slow down or stop the slip casting of the faster stand 2 of hoisting speed, in order to prevent that the lifting superelevation, cause frame construction's secondary to destroy.

It should be noted that, in the grouting lifting step, each lifting point is provided with a grouting machine for grouting, but in the actual construction process, in order to save the investment of the construction machines, sequential grouting construction can also be performed on the points needing to be synchronously lifted. However, after the single point is lifted, the adjacent upright posts are driven to be lifted, and a virtual space is formed at the bottom foundation of the upright posts, so that the single lifting value of each point position needs to be strictly controlled, and generally does not exceed 15 mm. And after the single point is lifted, the machine is moved to an adjacent lifting point to supplement the slurry. Examples are as follows: s1, s2 and s3 need to be lifted synchronously to a height of 9.5mm, and at the same time, the other sides of the building, s2 'and s 3', need to be lifted, so that 5 grouting machines are needed. However, if only 3 grouting machines are on site, s2 and s 2' can be selected to be lifted first; and then moving the machine to s1, s3 and s 3' for grouting, and after filling the foundations at the bottoms of the three, continuing grouting to lift the foundation to the designed elevation. Then, the machine is changed to other points (which may be s2 and s4, for example). If ground beams are arranged among s1, s2 and s3 and the space is large (for example, more than 8 m), the machine can be moved, the bottom of the ground beam is subjected to supplementary grouting, and then the ground beam is moved to s1, s3 and s 3'. Although the point locations of synchronous grouting can be selected in sequence according to the number of machines, the basic lifting sequence and principle cannot be broken through so as to ensure the protection of the structure and reduce the secondary damage to the building as much as possible.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A method for grouting, reinforcing and lifting a frame structure building is characterized by comprising the following steps:

s1, arrangement measuring point: measuring points are respectively arranged on the building corresponding to the positions of the upright columns (2), the average value h of the building settlement is calculated according to the measured elevation of the measuring points, and the average value h is used as a reference value; setting a measuring point with the largest sedimentation amount as s1, setting a measuring point which is close to the average value h and is closest to s1 as a reference zero point s0, setting measuring points from s1 to s0 as lifting points which are numbered as s2 and s3 … … sn in sequence, and setting sedimentation amounts of each lifting point compared with the average value h as h1 and h2 … … hn in sequence;

s2, arranging a lifting hole (3): a lifting hole (3) is formed in the side face of the upright post (2) which needs to be lifted in the building, and a grouting pipe is inserted into the lifting hole (3);

s4, grouting and lifting: the lifting principle is that pressure grouting lifting is adopted in the soil layer at the bottom of the upright post (2) from the area with large sedimentation amount to the area with small sedimentation amount, and the injected double-slurry reaches a slurry outlet at the bottom of the grouting pipe through different channels of the grouting pipe, is mixed and permeates into the soil body, and is solidified within 5-60 s; grouting and lifting s1, when the slope of a connecting line k1 between the elevation of s1 and the elevation of s2 is the same as that of k0, grouting the lifting hole (3) corresponding to s2, and synchronously lifting s1 and s 2;

when the slope of a connecting line k2 between the elevation of s1 and the elevation of s3 is the same as that of k0, grouting is carried out on a lifting hole (3) corresponding to s3, and s1, s2 and s3 are lifted synchronously;

2. The grouting reinforcement lifting method for the frame structure building according to claim 1, wherein: in step S3, d is 1/2-2/3 of h 1.

3. The grouting reinforcement lifting method for the frame structure building according to claim 1, wherein: in the grouting lifting process, intermittent grouting lifting is adopted, after grouting lifting is carried out for a certain height, the grouting lifting is suspended for a certain time so that the building structure can adapt, and then grouting lifting is carried out for a certain height.

4. The grouting reinforcement lifting method for the frame structure building according to claim 3, wherein: the pause time is 12-24 hours.

5. The grouting reinforcement lifting method for the frame structure building according to claim 1, wherein: and in the grouting lifting process, monitoring the elevation of each lifting point.

6. The grouting reinforcement lifting method for the frame structure building according to claim 5, wherein: adopt laser linkage alarm device, laser linkage alarm device includes laser emitter (5) and laser receiver (6), install laser receiver in the relevant position of stand (2) according to the lifting value to every lifting point settlement, set up laser emitter (5) outside the building elevation not receive slip casting lifting influence department, after laser receiver (6) was launched in the infrared emission of laser emitter (5) transmission, laser receiver (6) can send out the alarm sound, at this moment, slow down or stop the slip casting.

7. The grouting reinforcement lifting method for the frame structure building according to claim 6, wherein: laser receiver (6) have certain warning interval, and lifting slip casting in-process, laser receiver (6) rise along with stand (2), when being close to the settlement elevation, begin to report to the police, at this moment, slow down the slip casting speed to adopt the spirit level to carry out the elevation measurement, carry out real time monitoring.

8. A method of grouting reinforcement lifting for a frame structure building according to any one of claims 1 to 7, characterised in that: grouting lift includes two grouting stages: in the first stage, a grouting pipe extends into a soil body at the bottom of the foundation of the upright post (2) for grouting, and slurry and the soil body are mixed to form a reinforcement body (4); and a second-stage grouting pipe is inserted into the part of the reinforcing body close to the foundation of the upright post (2) from the lifting hole (3), pressure grouting is carried out, and the upright post (2) is lifted by using the reinforcing body (4) as a bearing layer.

9. The grouting reinforcement lifting method for the frame structure building according to claim 8, wherein: when the reinforcing body (4) is formed by the first-stage grouting, a drilling and grouting integrated layered grouting mode is adopted, and the length of each layer of grouting section is 0.3-0.5 m.