CN206707716U - A kind of tunnel portal weak surrounding rock section overlength pipe shed construction positioner - Google Patents
A kind of tunnel portal weak surrounding rock section overlength pipe shed construction positioner Download PDFInfo
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- CN206707716U CN206707716U CN201720517405.1U CN201720517405U CN206707716U CN 206707716 U CN206707716 U CN 206707716U CN 201720517405 U CN201720517405 U CN 201720517405U CN 206707716 U CN206707716 U CN 206707716U
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- locator
- pipe
- surrounding rock
- tunnel portal
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Abstract
The utility model discloses a kind of tunnel portal weak surrounding rock section overlength pipe shed construction positioner, it includes locator, and locator is placed on steel plate, and both sides are fixed using steel pipe, locator is connected by cable with display, and display is connected by frequency conversion equipment with extraneous power supply.The precision of pipe roof construction is ensure that using guiding technique, and drilling process provides reference, effective advance support provides technical guarantee for tunnel excavation to geologic record for tunnel excavation.The utility model drilling process is accurate, unbiased hole, hole phenomenon of collapsing, and pore-forming efficiency is high, is adapted to the environment such as complex geologic conditions, the loose layer of sand of soil property, argillic horizon.
Description
Technical field
A kind of weak section progress overlength pipe shed of area of heavy rainfull mountain ridge location tunnel portal length that is directed to is the utility model is related to apply
The positioner of work, and in particular to mountain tunnel weak surrounding rock, it is soft or hard it is irregular, have the geology bars such as V, VI grade of Wei Yan ﹚ of water Wei Yan ﹙
The especially complex tunnel portal of part carries out the construction positioner of overlength pipe shed advance support.
Background technology
In China Express Railway Tunnel Engineering entrance construction, pipe canopy is very common as the advance support for entering hole, applies
Work method is also highly developed, it can be common that using drawing, hole heads into method construction and pipe-following drilling method is constructed two kinds.Pipe canopy operation principle
Mainly there are two：One girder structure, rock stratum in wall and hole is oriented to by hole and forms a simply supported beam；Second passes through note
Slurry, the country rock on consolidation steel pipe periphery, steel pipe are collectively forming " arching effect " with peripheral rock；The two is formed around tunnel profile
Shell-like structure, so as to effectively suppress wall rock loosening and collapse.And although conventional construction technology is provided with hole guide pipe, by
Irregular in geology, pipe canopy is in the inclined hole phenomenon of frequent generation for drawing hole or drilling process, and detection methods are limited during performing,
The track of pipe-s hed drilling process can not be grasped, the final mesh that grouting reinforcement is carried out to tunnel excavation periphery can not be effectively achieved
, the phenomenon that pipe dingle portion is dropped in excavation contour line is often found after excavation, so the pipe canopy of conventional engineering method is typically all controlled
System is within 30~40m, and construction speed is slow, and construction precision is relatively low.
The content of the invention
The technical problems to be solved in the utility model is：It is fixed to provide a kind of tunnel portal weak surrounding rock section overlength pipe shed construction
Position device, using guide-localization technology, the position data of drill bit can be understood in real time, it is ensured that the precision of pipe roof construction, effectively
The technical problem for solving above-mentioned appearance.
The technical solution of the utility model is：A kind of tunnel portal weak surrounding rock section overlength pipe shed construction positioner, it
Including locator, locator is placed on steel plate, and both sides are fixed using steel pipe, and locator is connected by cable with display,
Display is connected by frequency conversion equipment with extraneous power supply.
The steel plate is arranged in the drilling rod head of rig.
The drilling rod processing：（1）Body of rod 6m mono- is saved, one end car internal sealing plug, one end car external sealing plug, is locally welded during connection
Connect reinforcement；（2）Drilling rod is connected with rig：One off-balance bit of welding in front of drilling rod first segment, body of rod rear connect with drilling tool thread
Connect；（3）Correction:Guiding instrument apparatus is installed in first pole body, it includes the locator of bit location, and locator is placed on
On steel plate, both sides are fixed using steel pipe, and locator is connected by cable with display, and guiding instrument apparatus is by frequency conversion equipment and outside
Boundary's power supply is connected；Locator in drilling process, drill bit steel pipe reaches the situation of drilling on display by cable, operation
The body of rod drilling off normal situation that personnel feed back according to display is rectified a deviation in time, while with drilling length and soil layer geology feelings
Condition, pass through manual operation rig motivation of adjustment, it is ensured that rig depth and position, until reaching depth and the position of requirement；（4）Note
Record geological condition：In drilling process, according to landwaste situation, front geological condition is recorded in time.
The beneficial effects of the utility model are：Compared with prior art, the utility model has the advantages that：
1st, drilling process is accurate, unbiased hole, hole phenomenon of collapsing, and pore-forming efficiency is high, is adapted to complex geologic conditions, soil property is loose
Layer of sand, argillic horizon etc.；
2nd, apply that process power output is uniform, the interference to geology is lacked；
3rd, boring procedure water consumption is few, and drilling uses pressure-air as power-forced drilling in soil layer（Drilled dry）, rock stratum
Middle control water, it is particularly suitable to gravelly soil, argillic horizon class soil layer, sandy soils；
4th, speed of fulfiling hole is fast, and work efficiency is high；
5th, long pipe shed one end enters basement rock, and one end is that hole is oriented to wall, and both ends are fixing end, can effectively control and play
Simply supported beam effect is obvious to control Portal Section excavation deformation effect；
6th, overlength pipe shed can effectively verify earth layer in front situation, excavated for subsequent tunnel and provide reference.
Brief description of the drawings
A kind of tunnel portal weak surrounding rock section overlength pipe shed construction positioning device structure schematic diagrames of Fig. 1；
A kind of tunnel portal weak surrounding rock section overlength pipe shed construction method process charts of Fig. 2；
Fig. 3 is oriented to wall formwork erection schematic diagram；
Fig. 4 orifice tube construction drill schematic diagrames.
Embodiment
The utility model embodiment：
Embodiment 1：A kind of tunnel portal weak surrounding rock section overlength pipe shed construction positioner, it includes locator 3, fixed
Position device 3 is placed on steel plate 1, and both sides are fixed using steel pipe 2, and locator 3 is connected by cable with display 5, and display 5 passes through
Frequency conversion equipment 6 is connected with extraneous power supply 7.
The steel plate 1 is arranged in the drilling rod first 4 of rig.
A kind of tunnel portal weak surrounding rock section overlength pipe shed construction positioner, its detailed application method and construction technology
Shown in flow as accompanying drawing 2：
（1）Preparation of construction：Determined to excavate the height and width of platform according to drill height and the longitudinal length needed, by original
Step is dug on ground from top to bottom, after digging to desired height and width, side slope to both sides and is faced upward slope and is carried out slope, while two
Side sets interim ditch；Excavation method uses mechanical equivalent of light excavation, artificial allotment of labor, and digging machine is cut clearly；
（2）Surveying setting-out：Required according to design document, tunnel center line, absolute altitude are gone out using total powerstation setting-out, and check standard
Really；According to review correct tunnel center line coordinates and elevation, identify be oriented to wall excavation scope and absolute altitude at the scene；
（3）Wall 9 is oriented to construct：
It is oriented to bow member installation in wall 9：After being oriented to the position of wall 9 excavation in place, bearing capacity examination is carried out to being oriented to the basis of wall 9 first
Test, be such as oriented to the foundation bearing capacity of wall 9 deficiency, consolidation process need to be carried out, after basis is qualified, 3 Pin I20b works are set in being oriented in wall 9
Word steel, set per Pin steelframes by 3 units, bow member joint is forbidden being arranged on keystone；
Pre-buried guide pipe：By surveying setting-out, pipe canopy position of opening is determined, and is identified with cross, guide pipe uses φ 127
× 6mm steel pipes, guide pipe and bow member firm welding, it is oriented to tube angulation and is strictly controlled by design requirement；
It is oriented to the formwork erection of wall 9, casting concrete：It is bolted before being oriented to the template of wall 9；To ensure to be oriented to the internal model of wall 9
It is smoother, it is oriented to the end head formwork of wall 9 and is installed using 5cm solid woods, connection is used between plank plus back up mode is reinforced, plank sheathing
It is connected firmly between steel form using dog or steel nail.Template and concrete surface brushing releasing agent；Model sheetinstallat is simultaneously examined
Look into it is qualified after, pour and be oriented to the concrete of wall 9, casting process needs strict control raw material quality, strengthens the mix matter of concrete
Amount, casting process are made firm by ramming closely knit, and concrete is unified symmetrically to be poured into a mould by blending station centralizedly supply, casting sequence from arch springing both sides, directly
To vault；After the completion of concreting, that is, maintenance, 7 days curing periods are proceeded by, while after intensity reaches 70%, start to remove non-
Load-carrying members and external mold, after intensity reaches 100%, that is, remove internal model and other templates；Orifice tube is numbered in sequence.
（See accompanying drawing 4）
（4）Face and side, face upward slope surface encapsulation：In order to prevent slip casting process, hole grout；Spray C25 coagulation graves
Close, thickness 15cm；
（5）Rig is in place：Rig uses track-mounted drill, according to the position of surveying setting-out, adjustment rig position；Using from
The high principle to even hole behind low, first odd number hole；
（6）Drilling：
A drilling rods are processed：The body of rod is uniformly processed by reinforcement yard, and material is φ 108*6mm pipe canopy materials, by 6m mono-
Section, one end car internal sealing plug, one end car external sealing plug, silk mouth depth are 3mm, length 8cm, locally carry out welding reinforcement during connection；
B drilling rods are connected with rig：One off-balance bit of welding in front of drilling rod first segment；Firm welding, the drill bit is once
Use；Body of rod rear is connected with drilling tool thread；
C rectifies a deviation:Guiding instrument apparatus is installed in first pole body, it includes the locator 3 of bit location, and locator 3 is put
Put on steel plate 1, both sides are fixed using steel pipe 2, and locator 3 is connected with outside hole using seizing wire, are oriented to instrument apparatus and are passed through change
Frequency device 6 is connected with extraneous power supply 7；The situation of drilling is reflected into display 5 by the locator 3 in drilling process, drill bit steel pipe
On, the body of rod drilling off normal situation that operating personnel feeds back according to display 5 is rectified a deviation in time, while with drilling length and soil
Layer geological condition, motivation of adjustment, it is ensured that rig depth and position, until reaching depth and the position of requirement；Sensor when performing
Can send signal, display 5 receive can show after signal drill bit now from hole depth, the discrepancy in elevation and drilling rod with it is in place
Horizontal angle, it is directed to the data that instrument apparatus receives and is contrasted with gross data, such as shows that discrepancy in elevation h is bigger than normal, then need
Adjustment drill bit is directed downward；Angle α is used for controlled level direction, and α values answer≤1, α>Then drill bit opposite direction " top " is entered to entangle when 1
Partially；If h and α values horizontally advance all in allowed band along with regard to bit line, finished until performing.
D records geological condition：In drilling process, according to landwaste situation, front geological condition is recorded in time.
（7）Move back drilling tool：After drilling to design attitude, the threaded connection between drilling rod and drilling tool is unclamped, head installation is only starched
Valve；
（8）Slip casting
A grouting sequences
Tube shed grouting order follows the principle of " among behind first both sides, from thin to thick ".Mortar depositing construction is constructed by both ends,
Promoted to tunnel vault direction, the concentration of slurry of slip casting is lower during beginning, gradual enriching to design concentration.
B slurries mixings
Slurrying is carried out according to deployed match ratio, slurries mix uniform, and have good mobility and viscosity.Note
The stirring work of slurry process can not stop, and one untill slip casting finishes.
C grouting pressures control with grouting amount
Using amount control and voltage-controlled double standards, should blow slowly during slip casting slip casting process pressurization, after reaching pressure, after voltage stabilizing, starch
Liquid uniformly overflows from sealing part sometimes, can also be overflowed sometimes at the rock crazing seam of surrounding, and expression has filled.Slip casting finishes
Afterwards, should illustrate not note in pipe grouting amount compared with theoretical values, when more when grouting amount is less than theoretical values
It is full, it should now stop carrying out pressure injection again after slip casting ascertains the reason.
D slip casting ending standards
As long as meet one of following three conditions during slip casting, you can think that single hole slip casting reaches the requirement of design and can
Terminate slip casting.First, grouting pressure is stepped up, and reaches design final pressure (generally 1.0~2.0MPa) stable 10min；Second,
80% of grouting amount not less than design grouting amount；3rd, it is to start 1/4 into slurry speed to enter to starch speed.
(9) sealing of hole
After the completion of slip casting, sealing of hole is carried out in time, prevents slurries from outflowing, ultimately form the arch ring of fixing-stable（See Fig. 4）, really
Stabilizing power during guarantor's tunnel excavation, reduce risk of distortion of the tunnel in work progress.
Claims (2)
- The positioner 1. a kind of tunnel portal weak surrounding rock section overlength pipe shed is constructed, it is characterised in that：It includes locator （3）, locator（3）It is placed on steel plate（1）On, both sides use steel pipe（2）It is fixed, locator（3）Pass through cable and display（5） It is connected, display（5）Pass through frequency conversion equipment（6）With extraneous power supply（7）It is connected.
- 2. a kind of tunnel portal weak surrounding rock section overlength pipe shed construction positioner according to claim 1, its feature exist In：The steel plate（1）Installed in the drilling rod head of rig（4）In.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720517405.1U CN206707716U (en) | 2017-05-10 | 2017-05-10 | A kind of tunnel portal weak surrounding rock section overlength pipe shed construction positioner |
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| CN201720517405.1U CN206707716U (en) | 2017-05-10 | 2017-05-10 | A kind of tunnel portal weak surrounding rock section overlength pipe shed construction positioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252876A (en) * | 2018-06-26 | 2019-01-22 | 中铁五局集团贵州工程有限公司 | A kind of advanced tubule angle positioning device |
-
2017
- 2017-05-10 CN CN201720517405.1U patent/CN206707716U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252876A (en) * | 2018-06-26 | 2019-01-22 | 中铁五局集团贵州工程有限公司 | A kind of advanced tubule angle positioning device |
| CN109252876B (en) * | 2018-06-26 | 2024-05-10 | 中铁五局集团贵州工程有限公司 | Advance little pipe angle positioner |
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