CN218757638U - Single pile bearing capacity detection device of post-grouting - Google Patents
Single pile bearing capacity detection device of post-grouting Download PDFInfo
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- CN218757638U CN218757638U CN202222281797.XU CN202222281797U CN218757638U CN 218757638 U CN218757638 U CN 218757638U CN 202222281797 U CN202222281797 U CN 202222281797U CN 218757638 U CN218757638 U CN 218757638U
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Abstract
The utility model discloses a single stake bearing capacity detection device of back mud jacking, include: at least two detection holes are arranged on a single cast-in-situ bored pile respectively; the electromagnetic wave transmitter is suspended in a detection hole; the electromagnetic wave receiver is suspended in the other detection hole; and the electromagnetic wave computer tomography technology detection host is connected with the electromagnetic wave transmitter and the electromagnetic wave receiver and is arranged on the plane of the cast-in-situ bored pile. The utility model discloses can evaluate the back mud jacking and whether reach the construction standard and the aassessment has obvious improvement to the single pile construction of drilling bored concrete pile to single pile bearing capacity.
Description
Technical Field
The utility model relates to a building engineering technology field, in particular to back mud jacking single pile bearing capacity detection device.
Background
The post grouting is a process in pile foundation construction, and in order to ensure the bearing capacity of a pile foundation, the pile bottom and pile periphery grouting process is generally carried out on a pile body through a grouting pipe embedded in advance after the pile foundation is poured. The pile foundation of the post grouting is mainly applied to the cast-in-situ bored pile. Through the post grouting process, the bearing capacity of the cast-in-situ bored pile can be effectively improved. According to the action principle of post-grouting, the grout injected by post-grouting at the pile end can be coagulated into a stone body with high strength and stable chemical performance by mixing and solidifying with sediments, so that the bearing capacity of the pile end is greatly improved. On the other hand, in the mud jacking process after pile measurement, the grout can reinforce the pile side clay soil (when a mud retaining wall is adopted) and the disturbed soil body in pore forming in a certain range through the actions of splitting, permeation and the like, the soil body after the grout is solidified participates in the bearing of the pile, the pile-soil interface condition is improved, the pile side frictional resistance is improved, the soil layer at the pile end and the soil layer in the certain range at the pile side can be changed in composition after the mud jacking, and the density and the strength are improved. Therefore, after the post-grouting process of the cast-in-situ bored pile, how to detect whether the bearing capacity of the post-grouting single pile meets the construction standard becomes a technical problem to be solved urgently in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a back mud jacking single pile bearing capacity detection device is provided to solve the problem of how to detect back mud jacking pile foundation bearing capacity and whether reach the construction standard.
In order to solve the technical problem, the utility model provides a technical scheme is: a single post grouting pile bearing capacity detection device comprises:
at least two detection holes are arranged on a single cast-in-situ bored pile respectively;
the electromagnetic wave transmitter is suspended in a detection hole;
the electromagnetic wave receiver is suspended in the other detection hole;
and the electromagnetic wave computer tomography detection host is connected with the electromagnetic wave transmitter and the electromagnetic wave receiver and is arranged on the plane of the cast-in-situ bored pile.
Further, the utility model provides a back mud jacking single pile bearing capacity detection device, electromagnetic wave transmitter includes:
the transmitter body is suspended in the corresponding detection hole through a first cable;
the transmitting antenna is connected to the transmitter body;
and the first heavy hammer is positioned below the transmitter body and is connected with the transmitter body or the transmitting antenna.
Further, the utility model provides a back mud jacking single pile bearing capacity detection device, electromagnetic wave transmitter still includes:
the first pulley is positioned at the edge of a detection hole of the cast-in-situ bored pile where the transmitter body is positioned and arranged on the upper surface of the corresponding cast-in-situ bored pile, and the first cable is adjustably suspended in the transmitter body through the first pulley and arranged in the corresponding detection hole.
Further, the utility model provides a back mud jacking single pile bearing capacity detection device, electromagnetic wave transmitter still includes:
the first winch is arranged on the upper surface of the corresponding cast-in-situ bored pile, and the first cable is wound on the first winch.
Further, the utility model provides a single stake bearing capacity detection device of back mud jacking, between the first cable perhaps first cable with connect through first plug connector 117 between the transmitter body.
Further, the utility model provides a single stake bearing capacity detection device of back mud jacking, the electromagnetic wave receiver includes:
the receiver body is suspended in the corresponding detection hole through a second cable;
a receiving antenna connected to the receiver body;
and the second heavy hammer is positioned below the receiver body and is connected with the receiver body or the receiving antenna.
Further, the utility model provides a single stake bearing capacity detection device of back mud jacking, the electromagnetic wave receiver still includes:
the second pulley is positioned at the edge of the detection hole of the cast-in-situ bored pile where the receiver body is positioned and arranged on the upper surface of the corresponding cast-in-situ bored pile, and the second cable is adjustably suspended in the receiver body through the second pulley and arranged in the corresponding detection hole.
Further, the utility model provides a back mud jacking single pile bearing capacity detection device, the electromagnetic wave receiver still includes:
and the second winch is arranged on the upper surface of the corresponding cast-in-situ bored pile, and the second cable is wound on the second winch.
Further, the utility model provides a single stake bearing capacity detection device of back mud jacking, perhaps between the second cable with connect through the second plug connector between the receiver body.
Further, the utility model provides a back mud jacking single pile bearing capacity detection device, first winch hangs for the calabash, perhaps the second winch hangs for the calabash.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the utility model provides a back mud jacking single pile bearing capacity detection device, through set up the detection hole at two at least drilling bored concrete piles well, suspend electromagnetic wave transmitter and electromagnetic wave receiver in midair respectively and set up within a detection hole, electromagnetic wave computer tomography technique detects host computer control electromagnetic wave transmitter transmission electromagnetic wave signal, electromagnetic wave signal propagates the electromagnetic wave receiver in the detection hole of a drilling bored concrete pile to another drilling bored concrete pile after the certain distance in the stratum medium and receives electromagnetic wave signal, and transmit to electromagnetic wave computer tomography technique on detecting the host computer, through the decay situation of the electromagnetic field intensity who detects the interior object of test zone, and detect the electromagnetic wave that the host computer utilizes computer software inversion to obtain through electromagnetic wave computer tomography technique and look absorption coefficient beta and generate the cloud picture, thereby reinforcing body structure and the reinforcing body distribution of single pile in the analysis test zone, confirm back mud jacking and whether reach the construction standard to the single pile bearing capacity.
The utility model provides a back mud jacking single pile bearing capacity detection device, whether the single pile construction of the bored concrete pile has obvious improvement through the distribution condition aassessment of the reinforcement body in the bored concrete pile that detects behind back mud jacking technology, density, the intensity of the reinforcement body when detecting have the promotion before for the construction, then show the back mud jacking and improved single pile bearing capacity.
Drawings
FIG. 1 is a schematic plan view of two adjacent cast-in-situ bored piles and the probe holes formed therein;
FIG. 2 is a schematic plan view of six cast-in-situ bored piles arranged in an annular array and three cast-in-situ bored piles provided with probe holes;
FIG. 3 is a schematic elevation structure diagram of the post-grouting single-pile bearing capacity detection device arranged in the pile foundation in FIG. 2;
FIG. 4 is a detection flow chart of the post-grouting single-pile bearing capacity detection device;
shown in the figure:
100. a post-grouting single pile bearing capacity detection device;
110. the electromagnetic wave transmitter 111, the transmitter body 112, the transmitting antenna 113, the first weight 114, the first cable 115, the first pulley 116, the first winch 117, the first plug connector 118 and the electromagnetic wave;
120. the electromagnetic wave receiver 121, the receiver body 122, the receiving antenna 123, the second weight 124, the second cable 125, the second pulley 126, the second winch 127 and the second plug connector;
130. detecting a host machine by an electromagnetic wave CT technology;
211. a first cast-in-place bored pile, 212, a second cast-in-place bored pile, 213, a third cast-in-place bored pile, 214, a fourth cast-in-place bored pile, 215, a fifth cast-in-place bored pile, 216, and a sixth cast-in-place bored pile;
220. a detection hole;
300. and (4) soil body.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings: the advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.
Example one
Referring to fig. 2 to 3, an embodiment of the present invention provides a post-grouting single-pile bearing capacity detection apparatus 100, including:
at least two detection holes 220 are respectively arranged on a single cast-in-situ bored pile. In which fig. 2 illustrates six cast-in-situ piles and three detection holes 220 provided in each of the cast-in-situ piles. The six cast-in-situ bored piles are a first cast-in-situ bored pile 211, a second cast-in-situ bored pile 212, a third cast-in-situ bored pile 213, a fourth cast-in-situ bored pile 214, a fifth cast-in-situ bored pile 215, and a sixth cast-in-situ bored pile 216 in the clockwise direction, and the second cast-in-situ bored pile 212, the fourth cast-in-situ bored pile 214, and the sixth cast-in-situ bored pile 216 are respectively provided with a detection hole 220.
The electromagnetic wave transmitter 110 is suspended in a detection hole 220. For example: electromagnetic wave transmitter 110 may be suspended within a corresponding probe hole 220 of at least one of second cast-in-situ bored pile 212, fourth cast-in-situ bored pile 214, and sixth cast-in-situ bored pile 216. Wherein the electromagnetic wave transmitter 110 may include: a transmitter body 111 suspended by the first cable 114 to be disposed within the corresponding detection hole 220; a transmitting antenna 112 connected to the transmitter body 111; the first weight 113 is located below the transmitter body 111, and is connected to the transmitter body 111 or the transmitting antenna 112. When the transmitting antenna 112 is connected to the transmitter body 111, the first weight 113 is connected to the transmitting antenna 112. At this time, the transmitting antenna 112 functions as both an antenna and a connecting line for the first weight 113.
And an electromagnetic wave receiver 120 suspended in the other detection hole 220. For example: the electromagnetic wave receiver 120 is suspended within a corresponding probe hole 220 of at least one of the second cast-in-situ bored pile 212, the fourth cast-in-situ bored pile 214, and the sixth cast-in-situ bored pile 216. Three sets of electromagnetic wave transmitters 110 and electromagnetic wave receivers 120 are illustrated in fig. 2, and both electromagnetic wave transmitters 110 and electromagnetic wave receivers 120 may be included within a probe bore 220 on second, fourth, and sixth cast-in-situ bored piles 212, 214, 216. Wherein the electromagnetic wave receiver 120 may include: a receiver body 121 suspended by the second cable 114 to be disposed within the corresponding detection hole 220; a receiving antenna 122 connected to the receiver body 121; and a second weight 123 located below the receiver body 121 and connected to the receiver body 121 or the receiving antenna 122. When the receiving antenna 122 is connected to the receiver body 121, the second weight 123 is connected to the receiving antenna 122. At this time, the receiving antenna 122 functions as both an antenna and a connecting wire for the second weight 123.
The electromagnetic wave computed tomography detection host 130 is connected to the electromagnetic wave transmitter 110 and the electromagnetic wave receiver 120, and is disposed on the plane of the bored pile. The electromagnetic wave computer tomography detection host 130, the electromagnetic wave receiver 120 and the electromagnetic wave transmitter 110 may adopt any technique known in the art.
Referring to fig. 3, in order to facilitate the transmitter body 111 hanging and setting up the detection hole 220 of the bored concrete pile, an embodiment of the present invention provides a post-grouting single-pile bearing capacity detection apparatus 100, wherein the electromagnetic wave transmitter 110 may further include: the first pulley 115 is arranged on the upper surface of the corresponding cast-in-situ bored pile at the edge of the detection hole 220 of the cast-in-situ bored pile where the transmitter body 111 is located, and the first cable 114 is adjustably suspended from the transmitter body 111 through the first pulley 115 and arranged in the corresponding detection hole 220. The guide function is provided by the first pulley 115 to facilitate the transmitter body 111 to be suspended by the first cable 114 within the corresponding detection hole 220 from contacting the hole wall of the detection hole 220.
Referring to fig. 3, in order to facilitate the receiver body 121 to suspend and set in the detection hole 220 of the bored pile, the apparatus 100 for detecting bearing capacity of a single post grouting pile according to an embodiment of the present invention further includes: and a second pulley 125 disposed on the upper surface of the corresponding cast-in-situ bored pile at the edge of the detection hole 220 of the cast-in-situ bored pile where the receiver body 121 is located, wherein the second cable is adjustably suspended from the receiver body 121 via the second pulley 125 to be disposed inside the corresponding detection hole 220. The second pulley 125 provides a guiding function to facilitate the receiver body 121 to be suspended and disposed inside the corresponding detection hole 220 through the second cable 124, and avoid contact with the hole wall of the detection hole 220.
Referring to fig. 3, in order to adjust the suspension depth of the transmitter body 111 and the receiver body 121 within the corresponding detection hole 220, in the embodiment of the present invention, the electromagnetic wave transmitter 110 may include: a first winch 116 disposed on an upper surface of the corresponding bored pile, and the first cable 114 is wound around the first winch 116. The electromagnetic wave receiver 120 may include: and a second winch 126 arranged on the upper surface of the corresponding cast-in-situ bored pile, wherein the second cable 124 is wound around the second winch 126. By winding and retracting the first cable 114 by the first winch 116, the length of the first cable 114 can be adjusted to adjust the depth of the transmitter body 111 disposed within the corresponding probe hole 220 to improve the accuracy and precision of the detection. Similarly, the second cable 124 is shrunk by the second winch 126 to adjust the depth of the receiver body 121 disposed within the corresponding detection hole 220, so as to improve the accuracy and precision of the detection. The first winch 116 may be a hoist, and the second winch 126 may also be a hoist.
Referring to fig. 3, in order to facilitate the connection between the transmitter body 111 and the first cable 114 and the connection between the receiver body 121 and the second cable 124, in the single-pile bearing capacity detecting apparatus 100 according to an embodiment of the present invention, the first cables 114 or the first cables 114 and the transmitter body 111 may be connected by a first plug connector 117; the second cables or the second cable and the receiver body may be connected by a second connector 127.
Example two
Referring to fig. 1, a single post-grouting pile bearing capacity detection apparatus 100 according to an embodiment of the present invention is improved based on the first embodiment, and the difference is that two cast-in-situ bored piles are provided, including a first cast-in-situ bored pile 211 and a second cast-in-situ bored pile 212, and each cast-in-situ bored pile is provided with a detection hole 220. Only one set of electromagnetic wave transmitters 110 and their corresponding electromagnetic wave receivers 120 are included, each disposed within a probe hole 220 in one of the bored piles.
Referring to fig. 1 to 3, the device 100 for detecting bearing capacity of a single post for post grouting provided in the above embodiment of the present invention sets the detection holes 220 in at least two bored piles, respectively suspends the electromagnetic wave transmitter 110 and the electromagnetic wave receiver 120 in one detection hole 220, controls the electromagnetic wave transmitter to transmit electromagnetic wave signals by the electromagnetic wave computer tomography detection host 130, transmits the electromagnetic wave signals in the detection hole 220 of one bored pile through the medium of the formation soil 300 for a certain distance to the electromagnetic wave receiver 120 in the detection hole 220 of another bored pile to receive the electromagnetic wave signals, and transmits the electromagnetic wave signals to the electromagnetic wave Computer Tomography (CT) technology detection host 130, and analyzes the reinforcing body structure and the distribution of the single post in the test area by detecting the attenuation of the electromagnetic field strength of the object in the test area and utilizing the electromagnetic wave visual absorption coefficient β obtained by the computer software installed on the electromagnetic wave computer tomography technology detection host 130 to determine whether the bearing capacity of the post grouting meets the reinforcing standard. Namely, the bearing capacity of the single pile is improved by using the electromagnetic wave CT technology to detect the post-grouting.
Referring to fig. 1 to fig. 3, the present invention provides a device 100 for detecting bearing capacity of a single post during post-grouting, which can detect the distribution of the reinforcement in the cast-in-situ bored pile after post-grouting, and evaluate whether the single post construction of the cast-in-situ bored pile is significantly improved, and when the detected reinforcement is improved in density and strength relative to the construction, the bearing capacity of the single post is improved by post-grouting.
The utility model discloses above-mentioned embodiment provides a single stake bearing capacity detection device 100 of back mud jacking's detection principle as follows: setting the intensity of the electromagnetic wave electric field of the transmitting end as E0, and the intensity of the electromagnetic wave electric field of the receiving end as E, and then the relation between E0 and E is as follows:
the expression of f (theta) in the formula (1) is shown in the formula (2):
in formula (1): beta is the absorption coefficient of the medium to the electromagnetic wave; r is the distance between the transmitting and receiving points; f (theta) is a transmitting-receiving antenna direction factor; theta is an included angle between the antenna at the receiving point and the direction of the electric field. Converting formula (1) to give formula (3):
in the formula (3), ω is the angular frequency of the electromagnetic wave, ε is the dielectric coefficient of the medium, μ is the permeability coefficient of the medium, and σ is the permeability coefficient of the medium. After the angular frequency of the omega electromagnetic wave is determined, when the electromagnetic wave propagates in the stratum, the magnetic permeability coefficient, the dielectric coefficient and the magnetic permeability of the medium change along with the change of the medium in the stratum, so that the absorption coefficient of the medium to the electromagnetic wave also changes, and the electromagnetic wave computer tomography technology judges the type and the crushing degree of the medium in the stratum according to the size of the absorption coefficient of the medium to the electromagnetic wave. Where ω is a known quantity and is a definite value, and the measured β is the absorption coefficient of the medium for electromagnetic waves. The change in β is caused by changes in the permeability coefficient μ, the permittivity coefficient ∈, and the σ dielectric permeability.
The detection procedure may be as follows:
(1) The apparatus and equipment for inspecting, namely the grouting single pile bearing capacity detection device 100 after inspection, ensure sufficient electric quantity and normal signal connection.
(2) Whether the detection hole 220 is unobstructed is checked, and the equipment can enter smoothly.
(3) Setting a pile number for detecting the cast-in-situ bored pile, setting detection frequency, and installing detection devices such as an antenna and the like; (4) And data transmission, wherein the electromagnetic field intensity value of the receiving point is stored.
(5) And checking whether the data are normal or not, and if a special condition occurs, carrying out detection again.
(6) And (4) carrying out post-processing analysis on the data, and obtaining the apparent absorption coefficient of the formation medium unit on the electromagnetic wave by adopting methods (post-stage redetermination) such as back projection, algebraic reconstruction, combined algebraic reconstruction and the like.
The parameter setting table of the electromagnetic wave computed tomography detection host 130 of the post-grouting single-pile bearing capacity detection apparatus 100 may be as follows in table 1:
TABLE 1
Wherein, the emitting hole and the receiving hole in table 1 are both referred to as the detecting hole 220.
Referring to fig. 4, the detection process may be as follows:
step 401, setting a detection hole on the cast-in-situ bored pile.
And step 402, forming holes by using the cast-in-situ bored piles and pouring concrete.
And 403, performing CT detection for the first time to obtain the electromagnetic wave absorption coefficient of the bored pile before the post grouting process.
And step 404, performing a post grouting process within 24-48 hours after the cast-in-situ bored pile pours concrete.
And 405, drilling and coring on the cast-in-situ bored pile after the post grouting process.
And 406, performing second CT detection to obtain the electromagnetic wave absorption coefficient of the bored pile after the post grouting process.
And step 407, comparing the drilling coring result and analyzing the electromagnetic wave absorption coefficient cloud chart to obtain a conclusion. And feeding back parameters, and drawing an absorption coefficient cloud picture. And matching the solid distribution of the coring position of the core drilling with the measurement result between the first CT detection and the second CT detection, calculating and correcting to obtain an electromagnetic wave visual correction coefficient beta, and performing inversion from the beta to obtain a correct cloud picture. The method can be used for calibrating the CT detection mode only by coring once, so that the electromagnetic wave absorption coefficient cloud picture of the non-cored position is obtained.
The present invention is not limited to the above specific embodiments, and obviously, the above described embodiments are a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived from the description of the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention. Other levels of modification and variation of the present invention will occur to those skilled in the art. Thus, if such modifications and variations of the present invention fall within the scope of the claims, then it is intended that the present invention also include such modifications and variations.
Claims (11)
1. The utility model provides a back mud jacking single pile bearing capacity detection device which characterized in that includes:
at least two detection holes are arranged on a single cast-in-situ bored pile respectively;
the electromagnetic wave transmitter is suspended in a detection hole;
the electromagnetic wave receiver is suspended in the other detection hole;
and the electromagnetic wave computer tomography detection host is connected with the electromagnetic wave transmitter and the electromagnetic wave receiver and is arranged on the plane of the cast-in-situ bored pile.
2. The post-grouting single-pile bearing capacity detection device according to claim 1, wherein the electromagnetic wave transmitter comprises:
the transmitter body is suspended in the corresponding detection hole through a first cable;
the transmitting antenna is connected to the transmitter body;
and the first heavy hammer is positioned below the transmitter body and is connected with the transmitter body or the transmitting antenna.
3. The post-grouting single-pile bearing capacity detection device according to claim 2, wherein the electromagnetic wave transmitter further comprises:
the first pulley is positioned at the edge of a detection hole of the cast-in-situ bored pile where the transmitter body is positioned and arranged on the upper surface of the corresponding cast-in-situ bored pile, and the first cable is adjustably suspended in the transmitter body through the first pulley and arranged in the corresponding detection hole.
4. The post-grouting single-pile bearing capacity detection device according to claim 3, wherein the electromagnetic wave transmitter further comprises:
the first winch is arranged on the upper surface of the corresponding cast-in-situ bored pile, and the first cable is wound on the first winch.
5. The post-grouting single-pile bearing capacity detection device according to claim 2, wherein the first cables or the first cable and the transmitter body are connected through a first plug connector.
6. The post-grouting single-pile bearing capacity detection device according to claim 1, wherein the electromagnetic wave receiver comprises:
the receiver body is suspended in the corresponding detection hole through a second cable;
a receiving antenna connected to the receiver body;
and the second heavy hammer is positioned below the receiver body and is connected with the receiver body or the receiving antenna.
7. The apparatus for detecting a post-grouting single-pile bearing capacity according to claim 6, wherein the electromagnetic wave receiver further comprises:
the second pulley is positioned at the edge of the detection hole of the cast-in-situ bored pile where the receiver body is positioned and arranged on the upper surface of the corresponding cast-in-situ bored pile, and the second cable is adjustably suspended in the receiver body through the second pulley and arranged in the corresponding detection hole.
8. The apparatus for detecting a post-grouting single-pile bearing capacity according to claim 7, wherein the electromagnetic wave receiver further comprises:
and the second winch is arranged on the upper surface of the corresponding cast-in-situ bored pile, and the second cable is wound on the second winch.
9. The post-grouting single-pile bearing capacity detection device according to claim 6, wherein the second cables or the second cables and the receiver body are connected through second connectors.
10. The post-grouting single-pile bearing capacity detection device according to claim 4, wherein the first winch is a hoist crane.
11. The post-grouting single-pile bearing capacity detection device according to claim 8, wherein the second winch is a hoist crane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222281797.XU CN218757638U (en) | 2022-08-29 | 2022-08-29 | Single pile bearing capacity detection device of post-grouting |
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| CN202222281797.XU CN218757638U (en) | 2022-08-29 | 2022-08-29 | Single pile bearing capacity detection device of post-grouting |
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