Device and method for monitoring embedding perpendicularity of long pile casing of cast-in-place pile

Abstract

The invention discloses a cast-in-place pile long pile casing burying perpendicularity monitoring device and a monitoring method thereof.The device comprises a long pile casing and a measuring pipe in the long pile casing, the measuring pipe is detachably fixed in the long pile casing, an inclinometer is arranged in the measuring pipe, a guide wheel on the inclinometer makes contact with the inner wall of the measuring pipe, and the guide wheel is arranged on the guide wheel. A cable on the inclinometer extends outwards in the measuring pipe, and a plurality of length nodes are uniformly arranged on the cable; according to the device and method for monitoring the burying perpendicularity of the long pile casing of the cast-in-place pile, the perpendicularity of the long pile casing can be monitored, so that the quality of a cast-in-place pile hole is guaranteed, and the problem that when the long pile casing is used for burying in a hole collapse stratum, continuous repeated measurement and adjustment are needed to guarantee the perpendicularity of the long pile casing is effectively solved; and the construction difficulty is reduced, the construction progress is accelerated, and application and popularization are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of cast-in-place pile construction, and in particular to a verticality monitoring device and a monitoring method for the buried long casing of a cast-in-place pile. Background Art

[0002] Bored piles have been widely used as a foundation reinforcement measure. More than 100 years ago, in 1893, engineers borrowed well digging technology to invent piles by pouring reinforced concrete in artificial holes. Fifty years later, in the early 1940s, with the successful development of high-power drilling rigs, bored piles were first introduced in the United States. They were widely used in high-rise and super-high-rise buildings and heavy structures. The design and construction level of bored piles in my country has also made great progress.

[0003] The key to the success of drilling is to prevent the hole wall from collapsing. To avoid this phenomenon, long casings are usually set up. In addition to playing a role in collapse, long casings also have the functions of isolating surface water, protecting the ground at the hole mouth, fixing the pile hole position and guiding the drill bit.

[0004] However, in actual construction, the long casing is prone to tilt, which ultimately leads to the tilt of the bored pile, affecting the construction quality and resulting in unsatisfactory use results. Therefore, a device capable of monitoring the verticality of the long casing is urgently needed. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned problems and provide a device and method for monitoring the verticality of long casings for bored piles, which can monitor the verticality of long casings and ensure the quality of bored pile holes, effectively solving the problem that long casings need to be constantly remeasured and adjusted to ensure their verticality when buried in formations prone to hole collapse. In addition, while monitoring the verticality of the buried long casings, the construction difficulty is reduced and the construction progress is accelerated.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a device for monitoring the verticality of a long casing buried in a cast-in-place pile, comprising a long casing and a measuring tube in the long casing, wherein the measuring tube is detachably fixed in the long casing, an inclinometer is arranged in the measuring tube, a guide wheel on the inclinometer contacts the inner wall of the measuring tube, a cable on the inclinometer extends outward in the measuring tube, and a plurality of length nodes are evenly arranged on the cable.

[0007] Preferably, a support seat for supporting the measuring tube is provided on the bottom inner wall of the long casing, and an arc-shaped depression is provided on the surface of the support seat, and the arc-shaped side wall of the measuring tube is engaged in the arc-shaped depression.

[0008] Preferably, the port of the long casing is provided with a limit clamping plate for fixing the measuring tube, the bottom of the limit clamping plate is provided with an arc-shaped clamping groove extending upward, the top of the limit clamping plate is bent outward, and the bent section of the limit clamping plate is provided with a penetrating screw.

[0009] Preferably, there are four measuring tubes, which are respectively arranged on two vertical diameters of the long casing, and the limit clamping plates and the support seats correspond to the measuring tubes one by one.

[0010] Preferably, the bottom of the support seat is a conical arc surface.

[0011] A monitoring method for a verticality monitoring device for buried long casings of cast-in-place piles, comprising the following steps: S1: leveling the site, and drilling a hole on the level site, wherein the hole diameter is smaller than the inner diameter of the long casing; S2: rechecking the verticality of the long casing; S3: opening an arc-shaped groove on a support seat, and welding the support seat with the arc-shaped groove to the inner wall of the long casing; S4: hanging the long casing so that the axis of the long casing coincides with the axis of the borehole; S5: using an external hydraulic vibratory hammer to hit the top end face of the long casing so that the long casing gradually enters around the borehole; S6: cleaning the collapsed soil in the long casing; S7: installing a measuring tube so that the cross section of the measuring tube falls into the arc-shaped groove on the support seat; S8: installing a limit block on the top, the limit block engages the port of the measuring tube through the arc-shaped groove, and inserts the screw into the ground surface, and the fixed measuring tube is arranged parallel to the long casing; S9: Install an inclinometer in the measuring tube, and use the data reflected by the inclinometer to reflect the verticality of the long casing.

[0012] Preferably, in step S1, the difference between the inner diameter of the borehole and the inner diameter of the long casing does not exceed 40 cm.

[0013] Preferably, it also includes S10: removal of the measuring tube, and the removal of the measuring tube includes the following steps: S901: Pull the cable upwards, and record data each time a length node passes through the port of the measuring tube until the inclinometer is completely taken out, wherein the distance between each two adjacent length nodes is 50-100cm; S902: After the inclinometer is taken out, first remove the limit block, and then lift the measuring tube vertically to separate the measuring tube from the long casing; S903: Cut and remove the support seat by using the hoisted cutting blade and milling cone to ensure that the inner wall of the long casing is flat.

[0014] The invention discloses a verticality monitoring device for burying a long casing of a bored pile, comprising a long casing and a measuring tube in the long casing, wherein the measuring tube is detachably fixed in the long casing, an inclinometer is arranged in the measuring tube, a guide wheel on the inclinometer contacts the inner wall of the measuring tube, a cable on the inclinometer extends outward in the measuring tube, and a plurality of length nodes are evenly arranged on the cable; compared with the prior art, the verticality monitoring device for burying a long casing of a bored pile and the monitoring method thereof have the advantages of being able to monitor the verticality of the long casing so as to ensure the quality of the bored pile hole, effectively solving the problem that when burying the long casing in a formation prone to hole collapse, it is necessary to continuously re-measure and adjust to ensure its verticality; in addition, while monitoring the verticality of the buried long casing, it also reduces the construction difficulty and accelerates the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The structure of the verticality monitoring device for the buried long casing of a bored pile according to the present invention is shown in FIG. Figure 1 .

[0016] Figure 2 The structure of the verticality monitoring device for the buried long casing of a bored pile according to the present invention is shown in FIG. Figure 2 .

[0017] Figure 3 The structure of the verticality monitoring device for the buried long casing of a cast-in-place pile according to the present invention is shown in FIG. Figure 3 .

[0018] Figure 4 The present invention is a schematic diagram of the internal structure of a verticality monitoring device for embedding a long casing of a bored pile.

[0019] Figure 5 For the present invention Figure 3 A local enlarged schematic diagram of the .

[0020] Figure 6 For the present invention Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0021] Figure 7 For the present invention Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0022] In the figure: 1. long casing; 2. measuring tube; 3. limit clamp; 31. arc-shaped slot; 4. screw; 5. support seat; 51. arc-shaped groove; 6. inclinometer; 7. cable; 8. length node. DETAILED DESCRIPTION

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and thus only show the components related to the present invention.

[0024] Please refer to Figure 1-7 A verticality monitoring device for a long casing of a bored pile comprises a long casing 1 and a measuring tube 2 in the long casing 1, wherein the measuring tube 2 is detachably fixed in the long casing 1, an inclinometer 6 is arranged in the measuring tube 2, wherein the inclinometer is a guide wheel inclinometer, the guide wheel on the inclinometer 6 contacts the inner wall of the measuring tube 2, a cable 7 on the inclinometer 6 extends outward in the measuring tube 2, a plurality of length nodes 8 are evenly arranged on the cable 7, wherein the distance between each two adjacent length nodes 8 is 50-100 cm, preferably 50 cm.

[0025] The inner wall at the bottom of the long casing 1 is provided with a support seat 5 for supporting the measuring tube 2, and the surface of the support seat 5 is provided with an arc-shaped depression 51, and the arc-shaped side wall of the measuring tube 2 is engaged in the arc-shaped depression 51. The bottom of the support seat 5 is a conical arc surface, which is convenient for extending into the formation. The port of the long casing 1 is provided with a limit clamping plate 3 for fixing the measuring tube 2, and the bottom of the limit clamping plate 3 is provided with an arc-shaped clamping groove 31 extending upward, and the top of the limit clamping plate 3 is bent outward by 90 degrees, and the bent section of the limit clamping plate 3 is provided with a through screw 4, which is inserted into the ground surface for fixing when in use.

[0026] When in use, the measuring tube 2 is arranged between the limit clamp plate 3 and the support seat 5, and the top and bottom of the measuring tube 5 are respectively engaged in the limit clamp groove 31 and the arc groove 51, so the measuring tube 2 will not be offset during use to affect the measurement accuracy, and the measuring tube 2 can be removed after the monitoring is completed.

[0027] The measuring tube 2 is always parallel to the long casing 1. When the long casing 1 tilts, the internal measuring tube also tilts accordingly. At this time, the tilt angle is determined by the data reflected by the internal inclinometer and adjusted to ensure quality.

[0028] In this embodiment, there are four measuring tubes 2, which are respectively arranged on two vertical diameters of the long casing 1. The four array-arranged measuring tubes 2 are analyzed and comprehensively judged through the data obtained by the inclinometer to improve the accuracy of verticality monitoring. The limit clamping plate 3 and the support seat 5 correspond to the measuring tubes 2 one by one.

[0029] A monitoring method for a verticality monitoring device for burying a long casing of a bored pile, comprising the following steps: S1: leveling the site, drilling a hole on the level site, wherein the hole diameter is smaller than the inner diameter of the long casing, and the difference between the inner diameter of the drilled hole and the inner diameter of the long casing does not exceed 40 cm, so as to facilitate the expansion of the diameter of the long casing; S2: rechecking the verticality of the long casing to avoid the initial verticality affecting the monitoring data; S3: opening an arc-shaped groove on a support seat, and welding the support seat with the arc-shaped groove to the inner wall of the long casing; S4: hanging the long casing so that the axis of the long casing coincides with the axis of the drilled hole, and after the axis is aligned, placing the bottom end of the long casing on the level ground; S5: Use an external hydraulic vibratory hammer to hit the top end face of the long casing, so that the long casing gradually enters around the borehole; since the inner diameter of the long casing is larger than the inner diameter of the borehole, the soil around the (original) hole will collapse inward with the impact of hydraulic vibration, and a new hole will be formed after the collapse. The diameter of the new hole is the inner diameter of the long casing; at this time, the outer wall of the long casing fits the external stratum soil, and the wall of the new hole is a solid original stratum, which ensures the quality of the new hole. Due to the setting of the long casing, the new hole will not collapse, crack, quicksand and other phenomena; S6: Clean the collapsed soil of the original hole in the long casing, and the hole expansion is completed after cleaning; S7: Install the measuring tube so that the cross section of the measuring tube falls into the arc groove on the support seat; S8: Install the limit block on the top, the limit block engages the port of the measuring tube through the arc groove, and inserts the screw into the surface. The fixed measuring tube is set parallel to the long casing; S9: Install an inclinometer in the measuring tube, and the data reflected by the inclinometer reflects the verticality of the long casing.

[0030] During installation, install it in a positive direction and make the guide wheel contact the inner wall of the inclinometer tube. The measuring position is determined by the hole depth. After the inclinometer is installed in place, first set the area code, hole number, hole depth and other data on the external device.

[0031] Based on the above embodiment, it also includes S10: removal of the measuring tube, and the removal of the measuring tube includes the following steps: S901: Pull the cable upwards, and record data each time a length node passes through the measuring tube port until the inclinometer is completely taken out, wherein the distance between each two adjacent length nodes is 50-100cm, preferably 50cm, that is to say, monitoring data is recorded each time a length node is passed until the inclinometer is completely taken out. Of course, preliminary monitoring can also be performed when the inclinometer is installed, and the taken out monitoring data is compared with the preliminary detection data to further reduce the monitoring error; S902: After the inclinometer is taken out, first remove the limit block, and then lift the measuring tube vertically to separate the measuring tube from the long casing; S903: Cut and remove the support seat by the hoisted cutting blade and milling cone to ensure that the inner wall of the long casing is flat.

[0032] The above-mentioned device and monitoring method can monitor the verticality of the long casing to ensure the quality of the bored pile hole, and the overall construction will not cause collapse or sand flow. It effectively solves the problem of constantly re-measurement and adjustment to ensure the verticality when burying long casing in formations prone to collapse. While monitoring the verticality of the buried long casing, it also reduces the construction difficulty and speeds up the construction progress.

[0033] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A verticality monitoring device for long casing of cast-in-place piles, characterized in that: It comprises a long casing and a measuring tube in the long casing, wherein the measuring tube is detachably fixed in the long casing, an inclinometer is arranged in the measuring tube, a guide wheel on the inclinometer contacts the inner wall of the measuring tube, a cable on the inclinometer extends outward in the measuring tube, and a plurality of length nodes are evenly arranged on the cable.

2. The verticality monitoring device for long casing buried in cast-in-place piles according to claim 1 is characterized in that: A support seat for supporting the measuring tube is arranged on the inner wall of the bottom of the long casing, and an arc-shaped depression is arranged on the surface of the support seat, and the arc-shaped side wall of the measuring tube is engaged in the arc-shaped depression.

3. The verticality monitoring device for long casing buried in cast-in-place pile according to claim 2 is characterized in that: The port of the long casing is provided with a limit clamping plate for fixing the measuring tube, the bottom of the limit clamping plate is provided with an arc-shaped clamping groove extending upward, the top of the limit clamping plate is bent outward, and the bent section of the limit clamping plate is provided with a penetrating screw.

4. The verticality monitoring device for long casing buried in cast-in-place pile according to claim 3 is characterized in that: There are four measuring tubes, which are respectively arranged on two vertical diameters of the long casing, and the limit clamping plates and the supporting seats correspond to the measuring tubes one by one.

5. The verticality monitoring device for long casing buried in cast-in-place pile according to claim 4 is characterized in that: The bottom of the support seat is in a conical arc surface.

6. A monitoring method for a verticality monitoring device for a long casing of a bored pile, characterized in that: The method comprises the following steps: S1: leveling the site, drilling a hole on the level site, wherein the hole diameter is smaller than the inner diameter of the long casing; S2: rechecking the verticality of the long casing; S3: opening an arc groove on a support seat, and welding the support seat with the arc groove to the inner wall of the long casing; S4: hanging the long casing so that the axis of the long casing coincides with the axis of the borehole; S5: using an external hydraulic vibration hammer to hit the top end face of the long casing so that the long casing gradually enters around the borehole; S6: cleaning the collapsed soil in the long casing; S7: Install the measuring tube so that the cross section of the measuring tube falls into the arc-shaped groove on the support seat; S8: Install the limit block on the top, the limit block engages the port of the measuring tube through the arc-shaped slot, and inserts the screw into the ground surface. The fixed measuring tube is set parallel to the long casing; S9: Install an inclinometer in the measuring tube, and use the data reflected by the inclinometer to reflect the verticality of the long casing.

7. The monitoring method of the verticality monitoring device for the buried long casing of a bored pile according to claim 6 is characterized in that: In step S1, the difference between the inner diameter of the borehole and the inner diameter of the long casing does not exceed 40 cm.

8. The monitoring method of the verticality monitoring device for the buried long casing of a bored pile according to claim 7 is characterized in that: It also includes S10: removal of the measuring tube, and the removal of the measuring tube includes the following steps: S901: Pull the cable upwards, and record data each time a length node passes through the port of the measuring tube until the inclinometer is completely taken out, wherein the distance between each two adjacent length nodes is 50-100cm; S902: After the inclinometer is taken out, first remove the limit block, and then lift the measuring tube vertically to separate the measuring tube from the long casing; S903: Cut and remove the support seat with the lifted cutting blade and milling cone to ensure that the inner wall of the long casing is flat.

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