A horizontal deformation measurement system and method for a pipe jacking working well

Abstract

The invention provides a system and method for measuring the horizontal deformation of a jacking working well. A convergence meter is selected as a measuring instrument, and an expansion screw is driven into a supporting structure as a measuring point after drilling a hole in the supporting structure by an impact electric hammer. The working principle of the convergence meter for mechanically transmitting displacement is used to measure the horizontal deformation of the working well, and the measured value is compared and analyzed with the specification requirements to judge the stress condition of the supporting structure, thereby ensuring the safety of the jacking working well during the construction of the working well and the jacking construction. The problem that the displacement measuring point of the pile body of the jacking working well of the bored cast-in-place pile supporting structure is easily blocked or damaged, resulting in inaccurate measurement data, is solved, and the method for measuring the jacking working well is improved. The measurement data can be compensated in time and accurately after other measuring points are damaged, thereby ensuring construction safety.

Description

Technical Field

[0001] The invention relates to the technical field of trenchless engineering, and in particular to a horizontal deformation measurement system and method for a jacking working well. Background Art

[0002] The jacking work well is a very important part of the jacking construction. The jacking work well that generally adopts the bored cast-in-place pile support structure has a large inner diameter and a deep burial depth. The safety of its structure is an important part of construction control. Therefore, the safety of the jacking work well must be ensured by necessary monitoring methods. The existing monitoring method is to pre-embed the inclinometer in the bored cast-in-place pile and use an inclinometer to monitor the horizontal displacement of the pile body. However, during the construction of the deep buried jacking work well, the pre-embedded inclinometer has a certain probability of being damaged during the concrete pouring, pile breaking, and pile top structure construction. In addition, the tunnel position needs to be broken during the jacking construction, and the bottom of the inclinometer in the bored cast-in-place pile will be damaged, making it impossible to measure normally. Therefore, exploring a convenient method for measuring the horizontal deformation of the jacking work well with measurement points that are not easily damaged is necessary to ensure the safe construction of the jacking work well. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a horizontal deformation measurement system and method for a pipe jacking working shaft, which aims to determine the stress condition of the support structure and ensure the safety of the pipe jacking working shaft during the working shaft construction and pipe jacking construction process.

[0004] An embodiment of the present invention provides a horizontal deformation measurement system for a pipe jacking working well, including a convergence meter and a plurality of pairs of fixing members;

[0005] Each pair of the fixing parts is fixed on the opposite side walls of the supporting structure in the jacking pipe working pit. The two pairs of the fixing parts are located at the same height. The fixing parts have a matching part that is adapted to the hook of the convergence meter. The hook of the convergence meter cooperates with the matching part so that the convergence meter and the fixing parts can be detachably connected. The two hooks of the convergence meter are connected to each pair of the fixing parts to measure the deformation degree of the jacking pipe working pit.

[0006] Furthermore, a plurality of ring beam supports are provided in the support structure from top to bottom, at least one pair of fixing members is provided at the upper end of the support structure, the fixing members are located above the uppermost ring beam support, and at least one pair of fixing members is provided between every two adjacent ring beam supports.

[0007] Furthermore, two pairs of fixing members are provided between the upper end of the supporting structure and each two adjacent ring beam supports, the connection directions of the two pairs of fixing members are perpendicular to each other, and the connection direction of one pair of fixing members is parallel to the axial direction of the top pipe.

[0008] Furthermore, a hole for the jacking pipe to pass through is provided at the lower end of the supporting structure, and at least one pair of fixing members is provided at the lower end of the supporting structure, and the fixing members are located between the lowest ring beam support and the hole.

[0009] Furthermore, two pairs of the fixing members are provided at the lower end of the supporting structure, and the connection directions of the two pairs of the fixing members are perpendicular to each other, and the connection direction of one pair of the fixing members is parallel to the axial direction of the top pipe.

[0010] An embodiment of the present invention provides a method for measuring horizontal deformation of a pipe jacking working well, characterized by comprising the following steps:

[0011] S1 During the excavation of the jacking working shaft, multiple pairs of fixings are arranged layer by layer on the opposite side walls of the support structure, and the two fixings in a pair are located at the same height, and the fixings have a matching portion adapted to the hook of the convergence instrument;

[0012] S2 uses two hooks of the convergence instrument to cooperate with the matching part to connect the two fixed parts in a pair, and adjusts the nut of the convergence instrument to change the length of the convergence instrument body to generate a constant tension on the steel ruler;

[0013] S3: using the convergence meter to measure the distance between the two paired fixing members to obtain the relative displacement between the two paired fixing members;

[0014] S4: If the relative displacement is less than or equal to the deformation value required by the specification, it is determined that the structure of the jacking pipe working pit is stable; if the relative displacement is greater than the deformation value required by the specification, it is determined that the deformation of the structure of the jacking pipe working pit is large.

[0015] Furthermore, in step S1, a plurality of monitoring holes are drilled on the supporting structure using an impact hammer, and the fixing member is installed in each of the monitoring holes.

[0016] Furthermore, in step S1, the fixing member is an expansion screw, and the expansion screw is hammered into the monitoring hole using a hammer.

[0017] Furthermore, after step S4, the method further includes:

[0018] S5 determines a warning value according to the monitoring specification, and when the relative displacement exceeds the warning value, promptly notifies the construction party to take countermeasures.

[0019] Further, step S5 includes determining a warning value according to monitoring specifications, and when the relative displacement is greater than a preset value, the preset value is less than the warning value, increasing the monitoring frequency, and notifying the construction party in time when the relative displacement exceeds the warning value.

[0020] The beneficial effects brought about by the technical solution provided by the embodiments of the present invention are: by selecting a convergence meter as a measuring instrument, a fixing part is provided on the support structure, and the working principle of the convergence meter's mechanical transmission of displacement is utilized to measure the horizontal deformation of the jacking working shaft, and the measured value is compared and analyzed with the specification requirements to judge the stress condition of the support structure, thereby ensuring the safety of the jacking working shaft during the construction and jacking of the jacking working shaft, solving the problem that the displacement measuring points of the pile body of the jacking working shaft are easily blocked or damaged, resulting in inaccurate measurement data, and improving the method of measuring the jacking working shaft, so that the measurement data can be compensated in a timely and accurate manner after other measuring points are damaged, thereby ensuring construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment of a horizontal deformation measurement system for a pipe jacking working well provided by the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram of the overhead structure of the horizontal deformation measurement system of the middle jacking working shaft.

[0023] In the figure: 1-support structure, 2-ring beam support, 3-hook, 4-fixing part, 5-convergence instrument, 6-jacking pipe. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0025] See also Figure 1 and Figure 2 An embodiment of the present invention provides a horizontal deformation measurement system for a jacking working well, including a convergence meter 5 and multiple pairs of fixing members 4.

[0026] Each pair of the fixing members 4 is fixed on opposite side walls of the support structure 1 in the jacking working shaft. The two pairs of the fixing members 4 are located at the same height. The fixing members 4 have a matching portion that is compatible with the hook 3 of the convergence meter 5. The hook 3 of the convergence meter 5 cooperates with the matching portion to make the convergence meter 5 detachably connected to the fixing member 4. The two hooks 3 of the convergence meter 5 are connected to each pair of the fixing members 4 to measure the deformation degree of the jacking working shaft. In this embodiment, a monitoring hole is provided at a position opposite to the supporting structure 1 and the fixing member 4. The fixing member 4 is an expansion screw fixed in the monitoring hole, and the hook head of the expansion screw forms the matching portion.

[0027] According to the monitoring experience of the jacking work well, at least one pair of the fixings 4 is set at the position where the support structure 1 is most likely to deform, so as to obtain more accurate deformation conditions. In this embodiment, a plurality of ring beam supports 2 are arranged from top to bottom in the support structure 1, and at least one pair of the fixings 4 is arranged at the upper end of the support structure 1, and the fixings 4 are located above the topmost ring beam support 2, and at least one pair of the fixings 4 is arranged between each two adjacent ring beam supports 2. According to the monitoring experience of the jacking work well, the support structure 1 is not easy to deform at the position where the ring beam support 2 is arranged, but it is easy to deform at the position where the ring beam support 2 is not arranged, so the fixings 4 are arranged above the ring beam support 2 and between the adjacent ring beam supports 2, so as to monitor the deformation of the jacking work well. Further, two pairs of the fixings 4 are arranged at the upper end of the support structure 1 and between each two adjacent ring beam supports 2, and the connecting lines of the two pairs of the fixings 4 are perpendicular to each other, and the connecting line direction of one pair of the fixings 4 is parallel to the axial direction of the jacking pipe 6, so as to monitor the convergence deformation of the jacking work well in the above two directions. During the excavation of the jacking working shaft, monitoring holes are set on the supporting structure 1 layer by layer. The monitoring holes are located between two adjacent ring beam supports 2, and expansion screws are fixed in the monitoring holes to monitor the horizontal deformation of the jacking working shaft during the excavation of the jacking working shaft.

[0028] The lower end of the support structure 1 is provided with a hole for the jacking pipe 6 to pass through, and the lower end of the support structure 1 is provided with at least one pair of fixing members 4, and the fixing members 4 are located between the lowest ring beam support 2 and the hole. Furthermore, the lower end of the support structure 1 is provided with two pairs of fixing members 4, and the connection directions of the two pairs of fixing members 4 are perpendicular to each other, and the connection direction of one pair of fixing members 4 is parallel to the axial direction of the jacking pipe 6. After the excavation of the jacking working well is completed, a hole needs to be excavated on the support structure 1 so that the jacking pipe 6 can be pushed into the formation from the hole. A fixing member 4 is provided between the lowest ring beam support 2 and the hole, and the horizontal deformation of the jacking working well during the jacking process of the jacking pipe 6 can be monitored.

[0029] By selecting the convergence meter 5 as the measuring instrument, a fixing part 4 is provided on the support structure 1, and the working principle of the mechanical transmission displacement of the convergence meter 5 is utilized to measure the horizontal deformation of the jacking working shaft, and the measured value is compared and analyzed with the specification requirements to judge the stress condition of the support structure 1, thereby ensuring the safety of the jacking working shaft during the construction of the jacking working shaft and the jacking of the jacking pipe 6, solving the problem that the displacement measuring points of the pile body of the jacking working shaft are easily blocked or damaged, resulting in inaccurate measurement data, and improving the measurement method of the jacking working shaft. After other measuring points are damaged, the measurement data can be compensated in time and accurately to ensure construction safety.

[0030] An embodiment of the present invention further provides a method for measuring horizontal deformation of a pipe jacking working well, comprising the following steps:

[0031] S1 During the excavation of the jacking working shaft, multiple pairs of fixing members 4 are arranged layer by layer on the opposite side walls of the support structure 1, and the two pairs of fixing members 4 are located at the same height, and the fixing members 4 have a matching portion adapted to the hook 3 of the convergence instrument 5;

[0032] Specifically, during the excavation of the jacking working shaft, an impact electric hammer is used to drill multiple monitoring holes on the support structure 1, and the fixing member 4 is installed in each of the monitoring holes. The monitoring hole is located between two adjacent ring beam supports 2. After the excavation of the jacking working shaft is completed, an impact electric hammer is used to drill multiple monitoring holes on the support structure 1. The monitoring hole is located between the lowest ring beam support 2 and the hole. The fixing member 4 is an expansion screw, which is hammered into the monitoring hole using a hammer.

[0033] S2 uses the two hooks 3 of the convergence instrument 5 to cooperate with the matching part to connect the two pairs of the fixing members 4, and adjusts the nut of the convergence instrument 5 to change the body length of the convergence instrument 5 to generate a constant tension on the steel ruler;

[0034] S3, before and after the pipe jacking working well is deformed, respectively using the convergence instrument 5 to measure the distance between the two paired fixing members 4 to obtain the relative displacement between the two paired fixing members 4;

[0035] Specifically, when points A and B are relatively displaced over time, the difference between the different readings measured at different times is the relative displacement between points A and B. For example, D0 is the first digital reading, L0 is the first steel ruler length reading, and D n is the nth displayed reading, L n For the nth length reading of the steel ruler, the relative displacement between the two measuring points A and B is S = (D0 + L0) - (D n +L n ). For the measurement during the excavation of the jacking working shaft, the monitoring points should be arranged in real time from top to bottom according to the excavation progress of the jacking working shaft supported by bored piles, and the measurement frequency should be increased during each excavation.

[0036] S4: If the relative displacement is less than or equal to the deformation value required by the specification, it is determined that the structure of the jacking pipe working pit is stable; if the relative displacement is greater than the deformation value required by the specification, it is determined that the deformation of the structure of the jacking pipe working pit is large.

[0037] S5 determines a warning value according to the monitoring specification, and when the relative displacement exceeds the warning value, promptly notifies the construction party to take countermeasures.

[0038] Specifically, the warning value is determined according to the monitoring specification. When the relative displacement is greater than the preset value, the preset value is less than the warning value, the monitoring frequency is increased, and the construction party is notified in time when the relative displacement exceeds the warning value.

[0039] The measurement method provided by the present invention is simpler than the prior art, can be completed by one person, saves working hours, and has simple data processing, accurate results, economy and reliability; the arranged monitoring points are simple in arrangement and not easily damaged, and even if they are damaged, they are easy to rearrange; it is suitable for the jacking working well of the bored cast-in-place pile support structure 1 of any current shape (circular, rectangular, quasi-rectangular).

[0040] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0041] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A horizontal deformation measurement system for a pipe jacking pit, characterized in that: It includes a convergence instrument and a plurality of pairs of fixings; Each pair of the fixing members is fixed on opposite side walls of the support structure in the top pipe working pit, and the two fixing members in a pair are located at the same height. The fixing members have a matching portion adapted to the hook of the convergence instrument, and the hook of the convergence instrument cooperates with the matching portion so that the convergence instrument and the fixing member are detachably connected. The two hooks of the convergence instrument are connected to each pair of the fixing members to measure the deformation degree of the top pipe working pit; A plurality of ring beam supports are arranged from top to bottom in the support structure, at least one pair of fixing members is arranged at the upper end of the support structure, the fixing member is located above the uppermost ring beam support, and at least one pair of fixing members is arranged between every two adjacent ring beam supports; Two pairs of fixing members are provided between the upper end of the support structure and each two adjacent ring beam supports, the connecting lines of the two pairs of fixing members are perpendicular to each other, and the connecting line direction of one pair of fixing members is parallel to the axial direction of the top pipe; The lower end of the support structure is provided with a hole for the top pipe to pass through, and the lower end of the support structure is provided with at least one pair of fixing members, and the fixing members are located between the lowest ring beam support and the hole.

2. The horizontal deformation measurement system for a pipe jacking pit according to claim 1, characterized in that: Two pairs of fixing members are provided at the lower end of the supporting structure, and the connection directions of the two pairs of fixing members are perpendicular to each other, and the connection direction of one pair of fixing members is parallel to the axial direction of the top pipe.

3. A method for measuring horizontal deformation of a pipe jacking work pit, applicable to the horizontal deformation measurement system for a pipe jacking work pit as claimed in claim 1 or 2, characterized in that: The following steps are involved: S1 During the excavation of the jacking working shaft, multiple pairs of fixing members are arranged layer by layer on the opposite side walls of the supporting structure, and the two fixing members in a pair are located at the same height, and the fixing members have a matching portion adapted to the hook of the convergence instrument; S2 uses two hooks of the convergence instrument to cooperate with the matching part to connect the two fixed parts in a pair, and adjusts the nut of the convergence instrument to change the length of the convergence instrument body to generate a constant tension on the steel ruler; S3: using the convergence meter to measure the distance between the two paired fixing members to obtain the relative displacement between the two paired fixing members; S4: If the relative displacement is less than or equal to the deformation value required by the specification, it is determined that the structure of the jacking pipe working pit is stable; if the relative displacement is greater than the deformation value required by the specification, it is determined that the deformation of the structure of the jacking pipe working pit is large.

4. The method for measuring horizontal deformation of a pipe jacking pit according to claim 3, characterized in that: In step S1, a plurality of monitoring holes are drilled on the supporting structure using an impact hammer, and the fixing member is installed in each of the monitoring holes.

5. The method for measuring horizontal deformation of a pipe jacking pit according to claim 4, characterized in that: In step S1, the fixing member is an expansion screw, and the expansion screw is hammered into the monitoring hole using a hammer.

6. The method for measuring horizontal deformation of a pipe jacking pit according to claim 3, characterized in that: After step S4, the method further includes: S5 determines a warning value according to the monitoring specification, and when the relative displacement exceeds the warning value, promptly notifies the construction party to take countermeasures.

7. The method for measuring horizontal deformation of a pipe jacking pit according to claim 6, characterized in that: Step S5 includes determining a warning value according to monitoring specifications, and when the relative displacement is greater than a preset value, the preset value is less than the warning value, increasing the monitoring frequency, and notifying the construction party in time when the relative displacement exceeds the warning value.

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