CN111719601A - Method and system for detecting bearing capacity of underground diaphragm wall - Google Patents
Method and system for detecting bearing capacity of underground diaphragm wall Download PDFInfo
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- CN111719601A CN111719601A CN202010563248.4A CN202010563248A CN111719601A CN 111719601 A CN111719601 A CN 111719601A CN 202010563248 A CN202010563248 A CN 202010563248A CN 111719601 A CN111719601 A CN 111719601A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The invention relates to a method and a system for detecting the bearing capacity of an underground diaphragm wall, wherein the method comprises the following steps: horizontally installing a jacking piece in a reinforcement cage of the underground continuous wall; the first positioning piece penetrates through the reinforcement cage and is fixedly connected with the top of the first reinforcement section; lowering the reinforcement cage into the excavated groove, and pouring concrete into the groove to form an underground continuous wall; arranging the exposed part of the sensor corresponding to the first positioning piece on the ground around the underground continuous wall; the length of adjusting jacking piece to exert jacking force to first reinforcing bar section and second reinforcing bar section, and utilize the sensor to detect the displacement volume that first locating piece exposes the part, thereby whether the bearing capacity according to jacking force and displacement volume inspection underground continuous wall accords with the designing requirement. The invention effectively solves the problem of difficult detection of the bearing capacity of the underground diaphragm wall, has lower requirement on a detection field, occupies small space and has less influence on the surrounding soil body, and the detection system has simple structure, convenient installation and easy realization.
Description
Technical Field
The invention relates to the field of building construction, in particular to a method and a system for detecting the bearing capacity of an underground diaphragm wall.
Background
With the increasingly tense urban construction land and the rapid development of underground space, foundation pit engineering is developing in a deep and large direction, underground continuous walls are not used for seepage prevention or soil retaining support, but can also be used as foundations of buildings to bear upper structure loads, and because the structures of the underground continuous walls are different from those of traditional building foundation piles, if a traditional bearing capacity detection method such as a stacking method is adopted, not only is the consumed time long, but also the detected wall body can not be used as an engineering wall, in addition, the method has higher requirements on detection sites, has larger influence on surrounding soil bodies, and has high comprehensive detection cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a method and a system for detecting the bearing capacity of an underground diaphragm wall, solves the problem of difficulty in detecting the bearing capacity of the underground diaphragm wall, has low requirements on a detection field, occupies small space, has small influence on surrounding soil mass, and has the advantages of simple structure, convenience in installation and easiness in implementation.
The technical scheme for realizing the purpose is as follows:
the invention provides a method for detecting the bearing capacity of an underground diaphragm wall, which comprises the following steps:
providing a jacking piece and a first positioning piece, and horizontally installing the jacking piece in a reinforcement cage of the underground continuous wall so as to divide the reinforcement cage into a first reinforcement section and a second reinforcement section which are positioned at the bottom and the top of the jacking piece;
penetrating the first positioning piece through the reinforcement cage and fixedly connecting the first positioning piece with the top of the first reinforcement section, and enabling the first positioning piece to be partially exposed out of the top of the reinforcement cage;
the steel reinforcement cage is placed into the excavated groove, concrete is poured into the groove to form an underground continuous wall, and the jacking piece is embedded into the underground continuous wall;
providing a sensor, and arranging the exposed part of the sensor corresponding to the first positioning piece on the ground around the underground continuous wall;
after the underground continuous wall reaches the set strength, the length of the jacking piece is adjusted to apply jacking force to the first steel bar section and the second steel bar section, so that the first positioning piece correspondingly descends, the sensor is utilized to detect the displacement of the exposed part of the first positioning piece, and whether the bearing capacity of the underground continuous wall meets the design requirement is checked according to the jacking force and the displacement.
The invention provides a method for detecting the bearing capacity of an underground continuous wall, which comprises the steps of installing a jacking piece in a steel reinforcement cage, pouring to form the underground continuous wall, embedding the jacking piece in the underground continuous wall, further adjusting the length of the jacking piece to apply jacking force in opposite directions to a first steel reinforcement section and a second steel reinforcement section, correspondingly lowering a first positioning piece at the top of the first steel reinforcement section, detecting the displacement of the exposed part of the first positioning piece by using a sensor, analyzing the bearing capacity of the underground continuous wall according to the displacement and the jacking force, pulling out the first positioning piece after the subsequent construction is finished, injecting slurry into a through hole formed by the first positioning piece to fill a gap in the underground continuous wall, enabling the underground continuous wall to be continuously used, solving the problem of difficult detection of the bearing capacity of the underground continuous wall, and having low requirement on a detection site, the occupied space is small, the influence on the surrounding soil body is small, and the detection system is simple in structure, convenient to install and easy to realize.
The method for detecting the bearing capacity of the underground continuous wall is further improved in that the method further comprises a second positioning piece vertically penetrating through the reinforcement cage and fixedly connected with the bottom of the second reinforcement section, and part of the second positioning piece is exposed out of the top of the reinforcement cage;
after the underground diaphragm wall reaches the set strength, the length of the jacking piece is adjusted to apply jacking force to the first steel bar section and the second steel bar section, so that the second positioning piece correspondingly rises, the sensor is utilized to detect the displacement of the exposed part of the second positioning piece, and whether the bearing capacity of the underground diaphragm wall meets the design requirement is checked according to the jacking force and the displacement.
The detection method for the bearing capacity of the underground continuous wall is further improved in that the detection method further comprises a first pressing plate and a second pressing plate which are oppositely arranged;
fixedly connecting a first pressing plate with the top of the first steel bar section, and fixedly connecting a second pressing plate with the bottom of the second steel bar section;
the jacking piece is connected between the first pressing plate and the second pressing plate, the first positioning piece is fixed on the top surface of the first pressing plate and correspondingly penetrates through the second pressing plate, and the second positioning piece is fixed on the top surface of the second pressing plate.
The method for detecting the bearing capacity of the underground continuous wall is further improved in that the method further comprises a first sleeve and a second sleeve, wherein one end of the first sleeve is fixed on the top surface of the first pressing plate, the other end of the first sleeve extends out of the top of the reinforcement cage, one end of the second sleeve is fixed on the top surface of the second pressing plate, and the other end of the second sleeve extends out of the top of the reinforcement cage;
the first positioning piece penetrates through the first sleeve, one end of the first positioning piece is arranged on the top surface of the first pressing plate, and the other end of the first positioning piece extends outwards from the top of the first sleeve;
and the second positioning piece is arranged in the second sleeve in a penetrating manner, one end of the second positioning piece is arranged on the top surface of the second pressing plate, and the other end of the second positioning piece extends out of the top of the second sleeve.
The method for detecting the bearing capacity of the underground continuous wall is further improved in that the first pressing plate and the second pressing plate are respectively provided with a plurality of grouting holes at intervals, so that the gap between the first pressing plate and the second pressing plate is filled with poured concrete through the grouting holes.
The method for detecting the bearing capacity of the underground continuous wall is further improved in that the length of the first pressing plate and the length of the second pressing plate are matched with the length of the underground continuous wall, and reinforcing beams are arranged on the top surface of the first pressing plate and the bottom surface of the second pressing plate.
The detection method for the bearing capacity of the underground continuous wall is further improved in that the detection method further comprises a support correspondingly supported on the ground around the underground continuous wall;
the sensor is mounted to the bracket corresponding to the exposed portion of the first positioning member.
The detection method for the bearing capacity of the underground continuous wall is further improved in that the jacking piece is an oil jack;
and providing an oil pump and an oil pipe, arranging the oil pump on the ground around the underground continuous wall, and communicating one end of the oil pipe with the oil pump and the other end of the oil pipe with the jacking piece by penetrating through the reinforcement cage.
The invention also provides a system for detecting the bearing capacity of the underground diaphragm wall, which comprises the following components:
the jacking piece is horizontally arranged in a reinforcement cage of the underground continuous wall and is adjustable in length, so that the reinforcement cage is divided into a first reinforcement section and a second reinforcement section which are positioned at the bottom and the top of the jacking piece;
the first positioning piece vertically penetrates through the reinforcement cage and is fixedly connected with the top of the first reinforcement section, and part of the first positioning piece is exposed out of the top of the reinforcement cage;
the second positioning piece vertically penetrates through the reinforcement cage and is fixedly connected with the bottom of the second reinforcement section, and part of the second positioning piece is exposed out of the top of the reinforcement cage; and
the sensors correspond to the exposed parts of the first positioning piece and the second positioning piece and are arranged on the ground around the reinforcement cage;
after the underground continuous wall is formed by pouring, the jacking piece is buried in the underground continuous wall, the length of the jacking piece is adjusted to apply jacking force to the first steel bar section and the second steel bar section, so that the first positioning piece correspondingly descends, the sensor is used for detecting the displacement of the exposed part of the first positioning piece, and whether the bearing capacity of the underground continuous wall meets the design requirement or not is checked according to the jacking force and the displacement.
The system for detecting the bearing capacity of the underground continuous wall is further improved in that the system further comprises a first sleeve and a second sleeve, wherein one end of the first sleeve is fixed on the top surface of the first pressing plate, and the other end of the first sleeve extends outwards from the top of the reinforcement cage;
the first positioning piece penetrates through the first sleeve, one end of the first positioning piece is installed on the top surface of the first pressing plate, and the other end of the first positioning piece extends outwards from the top of the first sleeve;
the second positioning piece penetrates through the second sleeve, one end of the second positioning piece is installed on the top surface of the second pressing plate, and the other end of the second positioning piece extends out of the top of the second sleeve.
Drawings
FIG. 1 is a front sectional view showing a state of use of the method for testing the load-bearing capacity of an underground diaphragm wall according to the present invention.
FIG. 2 is an enlarged schematic view of a jacking part in the method for detecting the bearing capacity of the underground continuous wall.
FIG. 3 is a perspective view of a jacking part in the method for detecting the bearing capacity of the underground continuous wall.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the invention provides a method for detecting the bearing capacity of an underground continuous wall, which comprises the steps of installing a jacking piece in a reinforcement cage, pouring to form the underground continuous wall, embedding the jacking piece in the underground continuous wall, further adjusting the length of the jacking piece to apply jacking force in opposite directions to a first reinforcement section and a second reinforcement section, correspondingly lowering a first positioning piece at the top of the first reinforcement section, detecting the displacement of the exposed part of the first positioning piece by using a sensor, analyzing the bearing capacity of the underground continuous wall according to the displacement and the jacking force, pulling out the first positioning piece after the subsequent construction is finished, grouting into a through hole formed by the first positioning piece to fill a gap in the underground continuous wall, enabling the underground continuous wall to be continuously used, solving the problem of difficult detection of the bearing capacity of the underground continuous wall, and having low requirement on a detection site, the occupied space is small, the influence on the surrounding soil body is small, and the detection system is simple in structure, convenient to install and easy to realize. The method for detecting the bearing capacity of the underground continuous wall is described below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a front cross-sectional view illustrating a use state of the method for detecting the load-bearing capacity of the underground diaphragm wall according to the present invention. The method for detecting the bearing capacity of the underground diaphragm wall is described below with reference to fig. 1.
As shown in fig. 1, the method for detecting the bearing capacity of the underground continuous wall of the invention comprises the following steps:
providing a jacking piece 11 and a first positioning piece 12, and horizontally installing the jacking piece 11 in a reinforcement cage of the underground continuous wall to divide the reinforcement cage into a first reinforcement section 211 and a second reinforcement section 212 which are positioned at the bottom and the top of the jacking piece 11;
the first positioning piece 12 penetrates through the reinforcement cage and is fixedly connected with the top of the first reinforcement section 211, so that the first positioning piece 12 is partially exposed out of the top of the reinforcement cage;
lowering the reinforcement cage into the excavated groove, and pouring concrete into the groove to form an underground continuous wall 21, so that the jacking piece 11 is embedded in the underground continuous wall 21;
providing a sensor 141, and arranging the sensor 141 on the ground around the underground continuous wall corresponding to the exposed part of the first positioning member 12;
after the underground continuous wall 21 reaches the set strength, the length of the jacking piece 11 is adjusted to apply jacking force to the first steel bar section 211 and the second steel bar section 212, so that the first positioning piece 12 correspondingly descends, the sensor 141 is used for detecting the displacement of the exposed part of the first positioning piece 12, and whether the bearing capacity of the underground continuous wall 21 meets the design requirement is detected according to the jacking force and the displacement.
Furthermore, the steel bar positioning device also comprises a second positioning piece 13 which vertically penetrates through the steel bar cage and is fixedly connected with the bottom of the second steel bar section 212, and part of the second positioning piece 13 is exposed out of the top of the steel bar cage;
after the underground continuous wall 21 reaches the set strength, the length of the jacking piece 11 is adjusted to apply jacking force to the first steel bar section 211 and the second steel bar section 212, so that the second positioning piece 13 correspondingly rises, and the sensor 141 is used for detecting the displacement of the exposed part of the second positioning piece 13, so that whether the bearing capacity of the underground continuous wall 21 meets the design requirement or not is detected according to the jacking force and the displacement, the pile end resistance can be presumed by the displacement of the first positioning piece 21, and the resultant force of the pile side friction resistance and the dead weight can be presumed by the displacement of the second positioning piece 13.
Preferably, the underground continuous wall can be inspected by using a slow-speed load-maintaining method, namely, the jacking force is acted on the first steel bar section and the second steel bar section step by controlling the jacking force of the jacking piece, the set time is maintained after the jacking force of each step is exerted, the displacement of the first positioning piece and the displacement of the second positioning piece are recorded, a relatively stable state is achieved when the displacement within each hour is not more than 0.1mm, the test is ended, unloading is started, a jacking force-displacement curve is drawn according to the recorded jacking force and displacement, if the curve has an obvious steep descending section, the value of the jacking force at the starting point of the steep descending section is the ultimate bearing capacity of the underground continuous wall, if the curve is in slow deformation, namely, if the curve does not have the obvious steep descending section, the jacking force corresponding to the total displacement is the bearing capacity of the underground continuous wall, whether the bearing capacity of the underground continuous wall is in a reasonable range or not is judged, the load bearing capacity of the underground diaphragm wall meets the design requirements.
Further, the device also comprises a support 14 correspondingly supported on the ground around the underground continuous wall 21;
the sensor 141 is attached to the bracket 14 corresponding to the exposed portion of the first positioning member 12.
Preferably, the sensor 141 may be a dial indicator, and the exposed ends of the first positioning member 12 and the second positioning member 13 abut against the telescopic end of the dial indicator, so as to change the degree of the dial indicator by pushing or pulling the telescopic end upwards, thereby measuring the displacement of the first positioning member 12 and the second positioning member 13.
Preferably, in order to ensure that the detection data truly reflects the bearing capacity of the single underground continuous wall, the first opening width of the test detection wall should be selected for carrying out, and the construction of the underground continuous wall of the adjacent groove section cannot be carried out before the test.
As a preferred embodiment of the present invention, as shown in fig. 2 and 3, the present invention further includes a first pressing plate 111 and a second pressing plate 112 disposed opposite to each other;
fixedly connecting the first pressing plate 111 with the top of the first steel bar section 211, and fixedly connecting the second pressing plate 112 with the bottom of the second steel bar section 212;
connect the jacking piece between first clamp plate 111 and second clamp plate 112, be fixed in the top surface of first clamp plate 111 and correspond first setting element 12 and pass second clamp plate 112, be fixed in the top surface of second clamp plate 112 with second setting element 13, can evenly act on first reinforcing bar section 211 and second reinforcing bar section 212 with power when jacking piece 11 jacking.
Specifically, the first pressing plate 111 and the second pressing plate 112 are provided with a plurality of grouting holes 115 at intervals, so that the poured concrete fills the gap between the first pressing plate 111 and the second pressing plate 112 through the grouting holes 115, that is, the jacking member 11 can be fully buried in the underground continuous wall 21.
Preferably, the lengths of the first pressing plate 111 and the second pressing plate 112 are matched with the length of the underground continuous wall 21, and reinforcing beams 114 are arranged on the top surface of the first pressing plate 111 and the bottom surface of the second pressing plate 112 to enable the first pressing plate 111 and the second pressing plate 112 to be stressed uniformly and increase the strength.
Furthermore, the concrete grouting device also comprises a first sleeve with one end fixed on the top surface of the first pressing plate 111 and the other end extending outwards from the top of the reinforcement cage and a second sleeve with one end fixed on the top surface of the second pressing plate 112 and the other end extending outwards from the top of the reinforcement cage, and grouting can be performed into the underground continuous wall 21 through the first sleeve and the second sleeve to fill gaps after the underground continuous wall 21 is tested in the later period, so that the integrity of the underground continuous wall 21 is ensured, and the underground continuous wall 21 can still be used after being tested;
the first positioning piece 12 is arranged in the first sleeve in a penetrating mode, one end of the first positioning piece 12 is arranged on the top surface of the first pressing plate 111, and the other end of the first positioning piece 12 extends out of the top of the first sleeve;
the second positioning element 13 is inserted into the second sleeve, and one end of the second positioning element 13 is installed on the top surface of the second pressing plate 112, and the other end of the second positioning element extends out from the top of the second sleeve.
Further, the jacking piece 11 is an oil jack;
providing an oil pump 113 and an oil pipe 1131, arranging the oil pump 113 on the ground around the underground continuous wall 21, and communicating one end of the oil pipe 1131 with the oil pipe 1131 of the oil pump 113 and the other end with the jacking piece 11 by penetrating through the reinforcement cage.
The specific implementation method of the invention is as follows:
digging a groove at the position of the underground continuous wall 21 to be formed, and binding a reinforcement cage of the underground continuous wall 21;
the first pressing plate 111 and the second pressing plate 112 are relatively installed at positions, close to the bottom, of the reinforcement cage, the first pressing plate 111 and the second pressing plate 112 are fixedly welded with corresponding reinforcements, in order to avoid the existence of initial stress between the first pressing plate 111 and the second pressing plate 112, the reinforcements connected between the first pressing plate 111 and the second pressing plate 112 are sheared, and reinforcing ribs are used for reinforcing the connection strength between the first pressing plate 111 and the corresponding reinforcements, and between the second pressing plate 112 and the corresponding reinforcements;
one end of a first sleeve is arranged at the top of the first pressing plate 111, the other end of the first sleeve penetrates through the reinforcement cage to extend outwards, one end of a second sleeve is arranged at the top of the second pressing plate 112, the other end of the second sleeve penetrates through the reinforcement cage to extend outwards, the first positioning piece 12 is arranged in the first sleeve in a penetrating mode, and the second positioning piece 13 is arranged in the second sleeve in a penetrating mode;
one end of the oil pipe 1131 is communicated with the jacking piece 11, and the other end of the oil pipe 1131 penetrates through the reinforcement cage to be communicated with the oil pump 113 on the ground;
the steel reinforcement cage is lowered into the excavated groove, concrete is poured into the groove to form an underground continuous wall 21, and the jacking piece 11 is embedded in the underground continuous wall 21;
a bracket 14 is erected on the ground close to the underground continuous wall 21, and the sensor 141 is arranged on the bracket 14 corresponding to the exposed parts of the first positioning piece 12 and the second positioning piece 13;
pressurizing the jacking piece 11 by using an oil pump 113 to extend the jacking piece 11, pushing the first steel bar section 211 and the second steel bar section 212 to correspondingly lower the first positioning piece 12 and correspondingly raise the second positioning piece 13, and detecting the displacement of the first positioning piece 12 and the second positioning piece 13 by using a sensor 141 to analyze the bearing capacity of the underground diaphragm wall 21;
after the detection is finished, the first positioning piece 12 and the second positioning piece 13 are pulled out from the first sleeve and the second sleeve, and concrete is poured into the jacking piece 11 through the first sleeve and the second sleeve to fill gaps in the jacking piece, so that the underground continuous wall 21 is complete in structure and can be normally used;
the method occupies a small construction space during testing, only a bracket is required to be erected on the ground for mounting the sensor, the tested underground diaphragm wall can be continuously used after grouting treatment, the detection cost is low, and the influence on the surrounding soil body during detection is small.
The invention also provides a system for detecting the bearing capacity of the underground diaphragm wall, which comprises the following components:
the jacking piece 11 is horizontally arranged in a reinforcement cage of the underground continuous wall 21 and has adjustable length so as to divide the reinforcement cage into a first reinforcement section 211 and a second reinforcement section 212 which are positioned at the bottom and the top of the jacking piece 11;
the first positioning piece 12 vertically penetrates through the reinforcement cage and is fixedly connected with the top of the first reinforcement section 211, and part of the first positioning piece 12 is exposed out of the top of the reinforcement cage; and
a sensor 141 corresponding to the exposed portion of the first locator 12 and disposed on the ground around the reinforcement cage;
after the underground continuous wall 21 is formed by pouring, the jacking piece 11 is buried in the underground continuous wall 21, jacking force is applied to the first steel bar section 211 and the second steel bar section 212 by adjusting the length of the jacking piece 11, so that the first positioning piece 12 correspondingly descends, the displacement of the exposed part of the first positioning piece 12 is detected by the sensor 141, and whether the bearing capacity of the underground continuous wall 21 meets the design requirement is detected according to the jacking force and the displacement.
Furthermore, the steel bar positioning device also comprises a second positioning piece 13 which vertically penetrates through the steel bar cage and is fixedly connected with the bottom of the second steel bar section 212, and part of the second positioning piece 13 is exposed out of the top of the steel bar cage;
by adjusting the length of the jacking part 11, the jacking force is applied to the first steel bar section 211 and the second steel bar section 212, so that the second positioning part 13 correspondingly rises, the sensor 141 is used for detecting the displacement of the exposed part of the second positioning part 13, whether the bearing capacity of the underground continuous wall 21 meets the design requirement or not is detected according to the jacking force and the displacement, the pile end resistance can be presumed by the displacement of the first positioning part 21, and the resultant force of the pile side friction resistance and the dead weight can be presumed by the displacement of the second positioning part 13.
Further, a support 14 is provided to support the ground around the underground diaphragm wall 21, and the sensor 141 is mounted to the support 14 corresponding to the exposed portion of the first positioning member 12.
Preferably, the sensor 141 may be a dial indicator, and the exposed ends of the first positioning member 12 and the second positioning member 13 abut against the telescopic end of the dial indicator, so as to change the degree of the dial indicator by pushing or pulling the telescopic end upwards, thereby measuring the displacement of the first positioning member 12 and the second positioning member 13.
Preferably, in order to ensure that the detection data truly reflects the bearing capacity of the single underground continuous wall, the first opening width of the test detection wall should be selected for carrying out, and the construction of the underground continuous wall of the adjacent groove section cannot be carried out before the test.
As a preferred embodiment of the present invention, as shown in fig. 2 and 3, the present invention further includes a first pressing plate 111 and a second pressing plate 112, which are oppositely disposed, wherein the first pressing plate 111 is fixedly connected to the top of the first steel bar section 211, and the second pressing plate 112 is fixedly connected to the bottom of the second steel bar section 212;
the jacking piece is connected between the first pressing plate 111 and the second pressing plate 112, the first positioning piece 12 is fixed on the top surface of the first pressing plate 111 and correspondingly penetrates through the second pressing plate 112, the second positioning piece 13 is fixed on the top surface of the second pressing plate 112, and when the jacking piece 11 jacks, force can be uniformly applied to the first steel bar section 211 and the second steel bar section 212.
Specifically, the first pressing plate 111 and the second pressing plate 112 are provided with a plurality of grouting holes 115 at intervals, so that the poured concrete fills the gap between the first pressing plate 111 and the second pressing plate 112 through the grouting holes 115, that is, the jacking member 11 can be fully buried in the underground continuous wall 21.
Preferably, the lengths of the first pressing plate 111 and the second pressing plate 112 are matched with the length of the underground continuous wall 21, and reinforcing beams 114 are arranged on the top surface of the first pressing plate 111 and the bottom surface of the second pressing plate 112 to enable the first pressing plate 111 and the second pressing plate 112 to be stressed uniformly and increase the strength.
Furthermore, the concrete grouting device also comprises a first sleeve with one end fixed on the top surface of the first pressing plate 111 and the other end extending outwards from the top of the reinforcement cage and a second sleeve with one end fixed on the top surface of the second pressing plate 112 and the other end extending outwards from the top of the reinforcement cage, and grouting can be performed into the underground continuous wall 21 through the first sleeve and the second sleeve to fill gaps after the underground continuous wall 21 is tested in the later period, so that the integrity of the underground continuous wall 21 is ensured, and the underground continuous wall 21 can still be used after being tested;
the first positioning element 12 penetrates through the first sleeve, one end of the first positioning element is mounted on the top surface of the first pressing plate 111, and the other end of the first positioning element 12 extends outwards from the top of the first sleeve;
the second positioning element 13 is disposed through the second sleeve, and one end of the second positioning element 13 is mounted on the top surface of the second pressing plate 112, and the other end of the second positioning element 13 extends out from the top of the second sleeve.
Further, the jacking piece 11 is an oil jack;
the detection system also comprises an oil pump 113 arranged on the ground around the underground continuous wall 21 and an oil pipe 1131 with one end communicated with the oil pump 113, wherein the other end of the oil pipe 1131 passes through the reinforcement cage to be communicated with the jacking piece 11.
The detection system provided by the invention is actually implemented in a specific operation mode as follows:
digging a groove at the position of the underground continuous wall 21 to be formed, and binding a reinforcement cage of the underground continuous wall 21;
the first pressing plate 111 and the second pressing plate 112 are relatively installed at positions, close to the bottom, of the reinforcement cage, the first pressing plate 111 and the second pressing plate 112 are fixedly welded with corresponding reinforcements, in order to avoid the existence of initial stress between the first pressing plate 111 and the second pressing plate 112, the reinforcements connected between the first pressing plate 111 and the second pressing plate 112 are sheared, and reinforcing ribs are used for reinforcing the connection strength between the first pressing plate 111 and the corresponding reinforcements, and between the second pressing plate 112 and the corresponding reinforcements;
one end of a first sleeve is arranged at the top of the first pressing plate 111, the other end of the first sleeve penetrates through the reinforcement cage to extend outwards, one end of a second sleeve is arranged at the top of the second pressing plate 112, the other end of the second sleeve penetrates through the reinforcement cage to extend outwards, the first positioning piece 12 is arranged in the first sleeve in a penetrating mode, and the second positioning piece 13 is arranged in the second sleeve in a penetrating mode;
one end of the oil pipe 1131 is communicated with the jacking piece 11, and the other end of the oil pipe 1131 penetrates through the reinforcement cage to be communicated with the oil pump 113 on the ground;
the steel reinforcement cage is lowered into the excavated groove, concrete is poured into the groove to form an underground continuous wall 21, and the jacking piece 11 is embedded in the underground continuous wall 21;
a bracket 14 is erected on the ground close to the underground continuous wall 21, and the sensor 141 is arranged on the bracket 14 corresponding to the exposed parts of the first positioning piece 12 and the second positioning piece 13;
pressurizing the jacking piece 11 by using an oil pump 113 to extend the jacking piece 11, pushing the first steel bar section 211 and the second steel bar section 212 to correspondingly lower the first positioning piece 12 and correspondingly raise the second positioning piece 13, and detecting the displacement of the first positioning piece 12 and the second positioning piece 13 by using a sensor 141 to analyze the bearing capacity of the underground diaphragm wall 21;
after the detection is finished, the first positioning piece 12 and the second positioning piece 13 are pulled out from the first sleeve and the second sleeve, and concrete is poured into the jacking piece 11 through the first sleeve and the second sleeve to fill gaps, so that the underground continuous wall 21 is complete in structure and can be normally used.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (10)
1. A method for detecting the bearing capacity of an underground diaphragm wall is characterized by comprising the following steps:
providing a jacking piece and a first positioning piece, and horizontally installing the jacking piece in a reinforcement cage of the underground continuous wall so as to divide the reinforcement cage into a first reinforcement section and a second reinforcement section which are positioned at the bottom and the top of the jacking piece;
penetrating the first positioning piece through the reinforcement cage and fixedly connecting the first positioning piece with the top of the first reinforcement section, and enabling the first positioning piece to be partially exposed out of the top of the reinforcement cage;
lowering the reinforcement cage into the excavated groove, and pouring concrete into the groove to form the underground continuous wall, so that the jacking piece is embedded in the underground continuous wall;
providing a sensor, and arranging the sensor on the ground around the underground continuous wall corresponding to the exposed part of the first positioning piece;
after the underground continuous wall reaches the set strength, adjusting the length of the jacking piece to apply jacking force to the first steel bar section and the second steel bar section, so that the first positioning piece correspondingly descends, detecting the displacement of the exposed part of the first positioning piece by using the sensor, and checking whether the bearing capacity of the underground continuous wall meets the design requirement according to the jacking force and the displacement.
2. The method for detecting the bearing capacity of the underground continuous wall as claimed in claim 1, further comprising a second positioning member vertically penetrating the reinforcement cage and fixedly connected with the bottom of the second reinforcement section, wherein the second positioning member partially exposes out of the top of the reinforcement cage;
after the underground diaphragm wall reaches the set strength, the length of the jacking piece is adjusted to apply jacking force to the first steel bar section and the second steel bar section, so that the second positioning piece correspondingly rises, the sensor is utilized to detect the displacement of the exposed part of the second positioning piece, and whether the bearing capacity of the underground diaphragm wall meets the design requirement is checked according to the jacking force and the displacement.
3. The method for detecting the bearing capacity of the underground continuous wall as claimed in claim 2, further comprising a first pressing plate and a second pressing plate which are oppositely arranged;
fixedly connecting the first pressing plate with the top of the first steel bar section, and fixedly connecting the second pressing plate with the bottom of the second steel bar section;
and connecting the jacking piece between the first pressing plate and the second pressing plate, fixing the first positioning piece on the top surface of the first pressing plate, correspondingly penetrating through the second pressing plate, and fixing the second positioning piece on the top surface of the second pressing plate.
4. The method for testing the bearing capacity of the underground continuous wall as claimed in claim 3, further comprising a first sleeve having one end fixed to the top surface of the first pressing plate and the other end extending outward from the top of the reinforcement cage, and a second sleeve having one end fixed to the top surface of the second pressing plate and the other end extending outward from the top of the reinforcement cage;
the first positioning piece penetrates through the first sleeve, one end of the first positioning piece is arranged on the top surface of the first pressing plate, and the other end of the first positioning piece extends out of the top of the first sleeve;
and the second positioning piece is arranged on the second sleeve in a penetrating mode, one end of the second positioning piece is arranged on the top surface of the second pressing plate, and the other end of the second positioning piece extends out of the top of the second sleeve.
5. The method for detecting the bearing capacity of the underground continuous wall as claimed in claim 3, wherein the first pressing plate and the second pressing plate are provided with a plurality of grouting holes at intervals, so that the poured concrete fills the gap between the first pressing plate and the second pressing plate through the grouting holes.
6. The method for detecting the bearing capacity of the underground continuous wall as claimed in claim 3, wherein the lengths of the first pressing plate and the second pressing plate are matched with the length of the underground continuous wall, and reinforcing beams are arranged on the top surface of the first pressing plate and the bottom surface of the second pressing plate.
7. The method for detecting the bearing capacity of the underground continuous wall as claimed in claim 1, further comprising a bracket correspondingly erected on the ground around the underground continuous wall;
and installing the exposed part of the sensor corresponding to the first positioning piece on the bracket.
8. The method for detecting the bearing capacity of the underground continuous wall as claimed in claim 1, wherein the jacking member is an oil jack;
and providing an oil pump and an oil pipe, arranging the oil pump on the ground around the underground diaphragm wall, communicating one end of the oil pipe with the oil pump, and communicating the other end of the oil pipe with the jacking piece after penetrating through the reinforcement cage.
9. The underground diaphragm wall load-bearing capacity detection system of claim 1, comprising:
the jacking piece is horizontally arranged in a reinforcement cage of the underground continuous wall and is adjustable in length, so that the reinforcement cage is divided into a first reinforcement section and a second reinforcement section which are positioned at the bottom and the top of the jacking piece;
the first positioning piece vertically penetrates through the reinforcement cage and is fixedly connected with the top of the first reinforcement section, and part of the first positioning piece is exposed out of the top of the reinforcement cage;
the second positioning piece vertically penetrates through the reinforcement cage and is fixedly connected with the bottom of the second reinforcement section, and part of the second positioning piece is exposed out of the top of the reinforcement cage; and
the sensors correspond to the exposed parts of the first positioning piece and the second positioning piece and are arranged on the ground around the reinforcement cage;
after the underground continuous wall is formed by pouring, the jacking piece is buried in the underground continuous wall, jacking force is applied to the first steel bar section and the second steel bar section by adjusting the length of the jacking piece, so that the first positioning piece correspondingly descends, the sensor is used for detecting the displacement of the exposed part of the first positioning piece, and whether the bearing capacity of the underground continuous wall meets the design requirement is checked according to the jacking force and the displacement.
10. The underground continuous wall load-bearing capacity detection system of claim 9, further comprising a first sleeve fixed at one end to the top surface of the first pressure plate and extending outwardly from the top of the reinforcement cage at the other end, and a second sleeve fixed at one end to the top surface of the second pressure plate and extending outwardly from the top of the reinforcement cage at the other end;
the first positioning piece penetrates through the first sleeve, one end of the first positioning piece is installed on the top surface of the first pressing plate, and the other end of the first positioning piece extends outwards from the top of the first sleeve;
the second positioning piece penetrates through the second sleeve, one end of the second positioning piece is installed on the top surface of the second pressing plate, and the other end of the second positioning piece extends out of the top of the second sleeve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010563248.4A CN111719601A (en) | 2020-06-19 | 2020-06-19 | Method and system for detecting bearing capacity of underground diaphragm wall |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010563248.4A CN111719601A (en) | 2020-06-19 | 2020-06-19 | Method and system for detecting bearing capacity of underground diaphragm wall |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2401189A (en) * | 2003-02-28 | 2004-11-03 | Roxbury Ltd | Friction and bearing force testing apparatus |
| CN105839678A (en) * | 2016-04-11 | 2016-08-10 | 湖北工业大学 | Improved pile foundation vertical bearing capacity test reverse self-balanced method and testing device |
| CN108166546A (en) * | 2018-01-24 | 2018-06-15 | 中建三局第二建设工程有限责任公司 | A kind of device and construction method that pile foundation preloading is carried out using self-balancing static load |
| CN110258672A (en) * | 2019-07-20 | 2019-09-20 | 东莞市建安桩基础工程有限公司 | A kind of self-balancing approach pile measurement system |
-
2020
- 2020-06-19 CN CN202010563248.4A patent/CN111719601A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2401189A (en) * | 2003-02-28 | 2004-11-03 | Roxbury Ltd | Friction and bearing force testing apparatus |
| CN105839678A (en) * | 2016-04-11 | 2016-08-10 | 湖北工业大学 | Improved pile foundation vertical bearing capacity test reverse self-balanced method and testing device |
| CN108166546A (en) * | 2018-01-24 | 2018-06-15 | 中建三局第二建设工程有限责任公司 | A kind of device and construction method that pile foundation preloading is carried out using self-balancing static load |
| CN110258672A (en) * | 2019-07-20 | 2019-09-20 | 东莞市建安桩基础工程有限公司 | A kind of self-balancing approach pile measurement system |
Non-Patent Citations (2)
| Title |
|---|
| 张在明等: "《岩土工程的安全与品质 大陆卷 天津 2007海峡两岸岩土工程/地工技术交流研讨会》", 30 April 2007, 中国建材工业出版社 * |
| 焦莹: "软弱土中大深度后压浆地下连续墙竖向承载力试验研究", 《土木工程学报》 * |
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