CN112363204A - Pneumatic triggering device and method for shield tunnel geological evaluation - Google Patents
Pneumatic triggering device and method for shield tunnel geological evaluation Download PDFInfo
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/02—Generating seismic energy
- G01V1/133—Generating seismic energy using fluidic driving means, e.g. highly pressurised fluids; using implosion
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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Abstract
The invention discloses a pneumatic trigger device and a method for shield tunnel geological evaluation, relating to the field of tunnel construction detection and comprising a plurality of hammering mechanisms arranged along the circumferential direction at the shield tail, wherein each hammering mechanism is connected with an air source through an air supply mechanism, each hammering mechanism comprises an air hammer, a power air chamber matched with the air hammer and a return spring, the air hammers are slidably arranged on the open holes of the shield tail shell, the power air chamber is communicated with the air supply mechanism, the return spring is matched to change the movement of the driving air hammer so as to change the relative positions of the air hammers and the shield tail, through regard as the power supply of shock excitation mechanism with the inside air supply of shield structure machine to cooperation air feed mechanism switch-on air supply and hammering mechanism, atmospheric pressure triggers and directly uses the inside air supply of shield structure to carry out the supply, realizes isobaric operation, has both guaranteed the impact dynamics, has guaranteed its break instantaneous again, satisfies the demand of the interior advance survey of tunnel arouse seismic wave.
Description
Technical Field
The disclosure relates to the field of tunnel construction detection, in particular to a pneumatic triggering device and method for shield tunnel geological evaluation.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the construction process of the subway line, the subway line inevitably passes through karst development areas, broken zones, cracks and other bad strata, and the bad strata enable construction to have more unknown properties and bring great disasters and risks. If the estimation cannot be predicted in advance, immeasurable loss and damage can be caused to construction units, buildings along the line and residents.
The inventor finds that the current exploration mode is ground exploration and real-time advanced exploration in a tunnel, and the exploration of the geological disaster in the tunnel has the characteristic of being more complex compared with the exploration in a drilling and blasting tunnel due to the sealing property of the shield environment. Based on the method, aiming at disaster sources such as boulders, abrupt strata, karst caves, silt soft and weak interlayers, broken zones and the like existing in rock strata and soil layers of urban subway construction areas, the excitation of seismic waves is realized in an active shock mode, seismic wave emission signals are obtained for analysis, and the work of real-time advanced exploration is completed; but power supplies such as hydraulic pressure that traditional mode adopted, voltage when the drive shock component, if guarantee to be interrupted the prompt then be difficult to guarantee its shock strength, be difficult to reach prompt point and shoot the effect, often need arrange a large amount of auxiliary assembly for realizing prompt point and shoot the effect to hydraulic pressure source, electric drive shock's mode, and inside the shield structure machine, the space is narrow for executing in the shield tail casing, be difficult to carry out the effective arrangement of auxiliary assembly, consequently, be subject to the excitation ability of shock component, be difficult to satisfy the shock wave seismic wave demand of real-time advanced exploration.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a pneumatic triggering device and a pneumatic triggering method for shield tunnel geological evaluation.
The first purpose of the disclosure is to provide a shield tunnel geological evaluation uses gas movable trigger device, adopts following technical scheme:
include a plurality of hammering mechanisms that the hoop was arranged along the shield tail, every hammering mechanism all inserts the air supply through air feed mechanism, and hammering mechanism includes the power air chamber and the reset spring of air hammer, cooperation air hammer, and air hammer slidable mounting is on the trompil of shield tail casing, and power air chamber intercommunication air feed mechanism cooperates reset spring to change the relative position of drive air hammer motion in order to change air hammer and shield tail.
Furthermore, a plurality of hammering mechanisms are uniformly arranged along the same circumferential section of the shield tail to form a group of trigger devices, and the air hammers corresponding to each hammering device are radially distributed along the shield tail and radially move along the shield tail.
The second purpose of the present disclosure is to provide a shield tunnel geological evaluation detection method, which includes the following steps:
arranging a single group of a plurality of hammering mechanisms distributed along the circumferential direction at the hinged position of the shield tail, and connecting the hammering mechanisms into an air source of the shield machine through an air supply mechanism;
after one-ring tunneling of the shield tunneling machine is completed, the air supply mechanism acquires air source pressure and outputs the air source pressure to excite the hammering mechanism, the air hammer penetrates through the shield tail shell to perform instantaneous point impact on surrounding rock to generate seismic waves, and seismic wave reflection signals are collected;
segment assembling and next tunneling are repeatedly carried out, and after the next tunneling is finished, the hammering mechanism is repeatedly excited to impact the surrounding rock to generate seismic waves and seismic wave reflection signals are collected;
and (3) taking single tunneling impact as a cycle, taking two adjacent cycles as a primary detection unit, repeating the detection process, and acquiring geological evaluation data.
Furthermore, the number of the hammering mechanisms is four, and the hammering mechanisms are uniformly distributed at intervals along the annular track line of the same circumferential section at the hinged position of the shield tail.
Furthermore, a power air chamber of the hammering mechanism is connected to an air source of the shield tunneling machine through an air storage chamber, the air storage chamber and the air source of the shield tunneling machine are in equal pressure, and the air storage chamber is supplemented after the collection of the reflected signals is completed.
Furthermore, the axis of the air hammer is arranged along the radial direction of the shield tail shell, the air hammer is driven by an air source to reciprocate along the radial direction of the shield tail shell, and the air hammer is positioned in the coverage range of the shield tail shell in an unexcited state.
Furthermore, the hammering mechanisms are respectively matched with control valves, and the hammering mechanisms are sequentially controlled to be excited along the annular direction.
Further, in one cycle of single tunneling, each hammering mechanism is excited for multiple times to acquire multiple groups of data.
Further, the hammering mechanism is installed inside the shield tail shell, the end part of the air hammer is coaxially matched with a through hole preset in the shield tail shell, and sealing treatment is carried out on a matching surface.
Furthermore, the gas exhausted after the hammering mechanism is excited enters the shield body through the exhaust pipe, and the shield body is kept closed.
Compared with the prior art, the utility model has the advantages and positive effects that:
(1) the air source in the shield machine is used as a power source of the shock excitation mechanism, the air source and the hammering mechanism are connected in a matched manner by the air supply mechanism, and the air pressure trigger directly uses the air source in the shield machine for supplying, so that isobaric operation is realized, the impact force is ensured, the instantaneous interruption is ensured, and the requirement of the advanced detection in the tunnel on seismic waves is met;
(2) the problem that the existing ballasting process with a hydraulic source and an electric drive as power sources has difficulty in meeting requirements due to instantaneous interruption is solved, the shield is supplied by directly using the air source of the shield, pressure boosting is not needed, isobaric operation is adopted, impact force and discontinuity are guaranteed, and potential safety hazards and space problems caused by secondary pressure boosting are avoided;
(3) the single-group hammering mechanism is arranged along the circumferential direction to form a single-ring triggering mechanism, the single-ring triggering mechanism is suitable for a narrow space in the shield tail, the interference influence on other mechanisms in the shield tail is reduced, the change of the position of a seismic source is realized through the tunneling of the shield machine during working, a single tunneling and knocking operation is taken as one cycle, and two cycles are taken as one detection unit, so that the narrow shield machine closed space is greatly saved, the problem of inaccurate coordinate positioning caused by multi-ring arrangement is solved, and the general two-dimensional plane detection effect is upgraded to a three-dimensional space detection effect;
(4) the single-ring triggering mechanism is adopted, and the single-ring shield machine can be triggered at different intervals along with tunneling, so that the single-ring shield machine is convenient to adapt to different geological conditions and different geological wave speeds for adjustment and is more suitable for geological detection;
(5) the air source is used as a power source of the hammering mechanism, the air source of the shield is connected into the shield, the connection of any external power source is omitted, the space requirement and the power safety problem of the shield machine are completely solved, the intermittent time of power supply of the air source is short, one power supply can be completed within 30 seconds on average, and the detection efficiency is greatly improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic overall structure diagram of a hammer mechanism in embodiments 1 and 2 of the present disclosure.
Wherein: 1: installation accommodating cavity, 2: external open-cell shield, 3: telescopic seismic source device box, 4: gas storage chamber, 5: power air chamber, 6: air hammer, 7: return spring, 8: seal structure, 9: shield shell fixing plate, 10: a sensor.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this disclosure, if any, merely indicate that the directions of movement are consistent with those of the figures themselves, and are not limiting in structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present disclosure.
As introduced in the background art, in the prior art, a large amount of auxiliary equipment is often required to be arranged in a hydraulic source and electric drive shock mode to realize a prompt point launching effect, and in the shield tunneling machine, the construction space in a shield tail shell is narrow, so that the effective arrangement of the auxiliary equipment is difficult; in order to solve the problems, the disclosure provides a pneumatic triggering device and a pneumatic triggering method for shield tunnel geological evaluation.
The method considers the shield machine realization difficulty and the stratum prediction evaluation method applicability, analyzes the stratum observation mode and the body carrying type in the narrow closed space of the shield, forms a mechanical seismic source-signal receiving shield integrated unfavorable geological detection scheme, and realizes the prediction and evaluation of the stratum in front of the shield tunnel. Therefore, the shield needs to be modified to have the implementation conditions of mechanically exciting the seismic source and receiving the reflected signal.
Example 1
In a typical embodiment of the present disclosure, as shown in fig. 1, an air-driven trigger device for shield tunnel geological evaluation is provided.
The shield tail comprises a plurality of hammering mechanisms which are arranged along the circumferential direction of the shield tail, each hammering mechanism is connected with an air source through an air supply mechanism, each hammering mechanism comprises an air hammer, a power air chamber matched with the air hammer and a reset spring, the air hammers are slidably mounted on openings of a shield tail shell, the power air chambers are communicated with the air supply mechanisms, and the reset springs are matched to change the movement of the driving air hammers so as to change the relative positions of the air hammers and the shield tail;
the specific structure of the hammering mechanism mainly comprises an air storage chamber 4, a power air chamber 5, an impact type air hammer 6, a shield shell fixing plate 9, a sealing structure body 8, an integrated control device and other auxiliary structures;
the shield tail shell is correspondingly modified by combining the attached drawing, an installation accommodating cavity 1 is arranged on an outer perforated shield shell 2, a shield shell fixing plate is arranged on the perforation, the shield shell fixing plate is matched with a sealing structure body 8 to be matched with an impact type air hammer, and a telescopic seismic source device box body 3 is arranged in the installation accommodating cavity;
for the telescopic seismic source device, corresponding to the hammering mechanism, a corresponding gas storage chamber and a corresponding power gas chamber are matched, the gas hammer is matched with a return spring 7 and is installed on a sealing structure body 8, and a sensor 10 is arranged between the power gas chamber and the gas hammer.
The seismic source hammering box body is used as a closed integral device, and the integral device is required to be used from installation to use and including later maintenance so as to ensure the shield body to be closed and safe.
For the arrangement of the hammering mechanisms, in the embodiment, a plurality of hammering mechanisms are uniformly arranged along the same circumferential section of the shield tail to form a group of trigger devices, and the air hammers corresponding to each hammering device are radially distributed along the shield tail and radially move along the shield tail;
taking four hammering mechanisms as an example, 4 hammering seismic source points are arranged on the left side and the right side of the hinged position of the shield tail respectively, the heights of the hammering seismic source points are divided into two layers, the hammering seismic source points are arranged in the directions of 45 degrees respectively and are distributed in an annular mode, and the hammering seismic source points are symmetrical and are uniformly distributed.
The accommodating cavity at the hinged position of the shield tail is annular and radioactive, the axial length is 460mm, the radial depth is 550mm, the minimum width is 330mm, and the maximum width is 400 mm. The size of the box body of the closed telescopic seismic source device is designed to be 280mm square in section and 320mm in height.
According to the scheme, a power control system of the closed telescopic seismic source device is designed: totally set up 4 independent closed flexible seismic source devices, the power source is the inside self-distribution cylinder of shield constructs the machine, direct gas transmission pipeline passes through shield tail articulated department curb plate preformed hole from the jump bit afterbody and is connected to the inside cylinder of shield structure, make atmospheric pressure stabilize all the time at about 5bar, with the inside air supply isobaric of shield structure, the access of any external power supply has been saved from this, the space demand and the power safety problem of shield structure machine have been solved completely, and the power supply intermittent type time of air supply is short, on average 30 seconds can accomplish power supply, greatly improved detection efficiency.
Each impact hammer is connected with the self-distribution 220v voltage inside the shield through a wire pipeline through a preformed hole on a side plate at the hinged position of the shield tail, and the self-distribution voltage serves as power support for controlling an electromagnetic valve inside the device.
The selection of the impact hammer body of the closed telescopic seismic source device comprises the following steps: the hardness of the tungsten steel hard alloy can reach 89-95 HRA. The weight of the hammer is 5Kg, the length is 15cm when the hammer is contracted, the length is 20cm when the hammer is completely spread, the hammer extends out of the shield shell part by 5cm, and the hammer can completely contact with a hammered rock wall. The diameter of the cross section is 5cm, and the hammering force and the contact area are fully ensured.
For the sealed structure of the sealed telescopic seismic source device: the shield shell fixing plate of the inner box body is attached to the inside of the shield shell in a welding and sealing mode to form the outermost protection of the sealing structure body, and meanwhile the sealing structure body comprises an external dustproof rubber sealing ring and an internal and external double-layer six-channel O-shaped metal sealing ring.
Wherein the O-shaped metal sealing ring is in a negative pressure type with holes, is made of 304 type stainless steel, and the external plating layer is made of polytetrafluoroethylene at the working temperature of-25 ℃ to +120 ℃. The sealing requirement under the environment of the underground shield tunnel can be completely met.
It should be noted that in this embodiment, the pneumatic source is used as the power source for the hammering element of the excitation mechanism, firstly because when geological exploration is performed by the seismic wave method, the seismic source needs to be generated with considerable propagation energy and clearly detectable intermittent triggering time, which means that the device for exciting seismic waves has the characteristics of ensuring instantaneous launching property, being incapable of being destructive in the tunnel and being repeatedly used.
On the basis, the common tunnel explosion seismic source is not advisable, and only an impact hammering method can be selected due to the high destructiveness of the tunnel explosion seismic source.
Compared with air pressure, hydraulic pressure, voltage and other power sources can not achieve instantaneous firing effect when being excited, the impact force and the discontinuity can not be considered at the same time, if the force is ensured, the interruption is not instantaneous, and if the interruption is ensured, the force is often insufficient;
as for the fact that multi-stage valve pressure regulation is not practical, firstly, pressure transformation in the shield machine is a great hidden danger for construction safety, and secondly, even if an adventure attempt is made, the essence of the pressure transformation is that energy is stored by a secondary container and then released, but in the shield machine, but no construction space exists, pressure boosting can not be performed on a plurality of hammering points respectively, so that the method is not feasible.
The air pressure triggering can directly use the air source of the shield to supply, does not need boosting, is isobaric operation, can ensure impact force and discontinuity, avoids potential safety hazards and space problems caused by secondary boosting, is rapid even in the aspect of air supplement efficiency, and meets the requirement of single-cycle multiple shock excitation.
Example 2
In another exemplary embodiment of the present disclosure, as shown in fig. 1, a method for detecting geological evaluation of a shield tunnel is provided.
The method comprises the following steps:
arranging a single group of a plurality of hammering mechanisms distributed along the circumferential direction at the hinged position of the shield tail, and connecting the hammering mechanisms into an air source of the shield machine through an air supply mechanism;
after one-ring tunneling of the shield tunneling machine is completed, the air supply mechanism acquires air source pressure and outputs the air source pressure to excite the hammering mechanism, the air hammer penetrates through the shield tail shell to perform instantaneous point impact on surrounding rock to generate seismic waves, and seismic wave reflection signals are collected;
segment assembling and next tunneling are repeatedly carried out, and after the next tunneling is finished, the hammering mechanism is repeatedly excited to impact the surrounding rock to generate seismic waves and seismic wave reflection signals are collected;
and (3) taking single tunneling impact as a cycle, taking two adjacent cycles as a primary detection unit, repeating the detection process, and acquiring geological evaluation data.
The four hammering mechanisms are uniformly distributed at intervals along the annular track line of the same circumferential section at the hinged position of the shield tail; and the power air chamber of the hammering mechanism is connected to an air source of the shield tunneling machine through an air storage chamber, the air storage chamber and the air source of the shield tunneling machine are in equal pressure, and the air storage chamber is supplemented after the collection of the reflected signals is completed.
Therefore, the detection signal can be quickly excited, the rapid collection of the adverse geological information in front of the shield construction is realized, and the influence of the external environment is basically avoided.
The hammering mechanisms are respectively matched with control valves and are sequentially controlled to be excited along the annular direction; in one cycle of single tunneling, each hammering mechanism is excited for multiple times to acquire multiple groups of data.
It should be noted that, in order to achieve a three-dimensional geological detection, at least two rings are necessary to excite the seismic source, so that a spatial ellipsoid coverage with the rear detector is possible.
The spacing requirement varies with the change in geological conditions due to the different wave velocities, but the distance between the two rings must be more than 2m, so that the distance is sufficient to be compared with the distance of about 20m of the rear receiver, and the two sets of data cannot be distinguished easily when received.
The shield machine can only have a space with the diameter less than 3m for tapping, and complex pipelines in the shield machine are required to be avoided, so that a two-ring trigger device cannot be effectively arranged, the single-ring arrangement is adopted, the space is saved, the tapping position can be selected more flexibly and safely, particularly on the aspect of exciting the seismic source interval, due to the fact that rear data can be stored without limiting timeliness, the single-ring shield machine can be triggered at different intervals along with the tunneling, the single-ring shield machine can be conveniently adjusted to adapt to different geological conditions and different geological wave speeds, and the single-ring shield machine is more suitable for geological detection.
Specifically, with reference to example 1, the excitation detection process is described in detail:
a perforated telescopic impact hammer is arranged at the hinged position of the tail part of the shield body;
when each detection is carried out, the segment assembly is temporarily stopped after one-ring tunneling is finished;
firstly, connecting 4 impact hammers with a mobile control device, then sequentially controlling the driving of an electromagnetic valve to enable the impact hammers to be excited, carrying out instantaneous point-to-point impact to generate seismic waves, and carrying out air source power supplement after the acquisition of seismic wave reflection signals is finished;
continuously introducing gas into a pneumatic cylinder body hammer of the closed telescopic seismic source device through a gas pipe by a shield self-gas distribution pump, controlling the middle by an electromagnetic gas valve to be switched on and off, keeping the unidirectional supplement of the gas and maintaining the constant pressure in the shield body;
sequentially controlling the electromagnetic valve drive of 4 impact hammers on a mobile terminal to enable the impact hammers to be excited, carrying out instantaneous point impact to generate seismic waves, hammering each point for 3 times, and generating 12 mechanical hammering waves in total;
and finishing the acquisition of seismic wave reflection signals.
Furthermore, gas can enter the shield body through the exhaust pipe, so that the whole process is guaranteed to be airtight.
After hammering is finished, the impact hammer shrinks and is hidden in the shield body, air source power supplement is carried out simultaneously, the electromagnetic valve switch control line and the sensing line can be stored in the preformed hole, and the mobile control terminal can also be withdrawn out of the shield tunnel after seismic wave signals are received.
The single tunneling and knocking is used as a cycle, and two cycles are used as a detection unit, so that the narrow shield machine closed space is greatly saved, the problem of inaccurate coordinate positioning caused by multi-ring arrangement is solved, and the general two-dimensional plane detection effect is upgraded to the three-dimensional space detection effect.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. The utility model provides a shield constructs tunnel geological evaluation and sends out device with gas movable contact, a serial communication port, include a plurality of hammering mechanisms that the hoop was arranged at the shield tail, every hammering mechanism all inserts the air supply through air feed mechanism, hammering mechanism includes the air hammer, the power air chamber and the reset spring of cooperation air hammer, air hammer slidable mounting is on the trompil of shield tail casing, power air chamber intercommunication air feed mechanism, cooperation reset spring changes the relative position of drive air hammer motion in order to change air hammer and shield tail.
2. The pneumatic triggering device for shield tunnel geological evaluation according to claim 1, wherein a plurality of hammering mechanisms are uniformly arranged along the same circumferential section of the shield tail to form a set of triggering devices, and the pneumatic hammers corresponding to each hammering device are radially distributed along the shield tail and radially move along the shield tail.
3. A shield tunnel geological evaluation detection method is characterized by comprising the following steps:
arranging a single group of a plurality of hammering mechanisms distributed along the circumferential direction at the hinged position of the shield tail, and connecting the hammering mechanisms into an air source of the shield machine through an air supply mechanism;
after one-ring tunneling of the shield tunneling machine is completed, the air supply mechanism acquires air source pressure and outputs the air source pressure to excite the hammering mechanism, the air hammer penetrates through the shield tail shell to perform instantaneous point impact on surrounding rock to generate seismic waves, and seismic wave reflection signals are collected;
segment assembling and next tunneling are repeatedly carried out, and after the next tunneling is finished, the hammering mechanism is repeatedly excited to impact the surrounding rock to generate seismic waves and seismic wave reflection signals are collected;
and (3) taking single tunneling impact as a cycle, taking two adjacent cycles as a primary detection unit, repeating the detection process, and acquiring geological evaluation data.
4. The shield tunnel geological evaluation detection method of claim 3, wherein four of the hammering mechanisms are uniformly spaced along the circular trajectory of the same circumferential section at the shield tail hinge position.
5. The shield tunnel geological evaluation detection method of claim 3, wherein the power air chamber of the hammering mechanism is connected to the shield machine air source through an air storage chamber, the air storage chamber and the shield machine air source are in equal pressure, and the air storage chamber is supplemented after the collection of the reflected signals is completed.
6. The shield tunnel geological evaluation detection method of claim 3, wherein the air hammer axis is arranged along the radial direction of the shield tail shell, and is driven by an air source to reciprocate along the radial direction of the shield tail shell, and in an unexcited state, the air hammer is positioned in the coverage range of the shield tail shell.
7. The shield tunnel geological evaluation detection method of claim 3, characterized in that the hammering mechanisms are respectively matched with control valves, and the hammering mechanisms are sequentially controlled to be excited in an annular direction.
8. The shield tunnel geology evaluation detection method of claim 7, wherein each hammering mechanism is activated multiple times to acquire multiple sets of data during a single cycle of a single drive.
9. The shield tunnel geological evaluation detection method of claim 3, wherein the hammering mechanism is installed inside the shield tail shell, the end of the air hammer is coaxially matched with a through hole preset on the shield tail shell, and sealing treatment is performed on the matching surface.
10. The shield tunnel geological evaluation detection method of claim 9 wherein the gas exhausted after the hammering mechanism is activated enters the shield through the exhaust pipe to maintain the shield closed.
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