CN105736000B - The construction method of shield molding tunnel nullring section of jurisdiction is removed in a kind of static blasting - Google Patents

The construction method of shield molding tunnel nullring section of jurisdiction is removed in a kind of static blasting Download PDF

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Publication number
CN105736000B
CN105736000B CN201610129540.9A CN201610129540A CN105736000B CN 105736000 B CN105736000 B CN 105736000B CN 201610129540 A CN201610129540 A CN 201610129540A CN 105736000 B CN105736000 B CN 105736000B
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China
Prior art keywords
jurisdiction
static
nullring
construction
blasting
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CN201610129540.9A
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CN105736000A (en
Inventor
王文兵
张兆龙
成果
郭军立
潘娜娜
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BEIJING ZHUZONG GROUP Co Ltd
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BEIJING ZHUZONG GROUP Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/006Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods

Abstract

The invention discloses the construction methods that shield molding tunnel nullring section of jurisdiction is removed in a kind of static blasting, comprising the following steps: step 1, the outer annular face cloth hole in the nullring section of jurisdiction drills in cloth hole site;Step 2, static blasting is carried out to section of jurisdiction step by step, broken section of jurisdiction is cleared up;The good static breaking agent of mixing is filled into the section of jurisdiction on top first, static blasting is carried out to it, broken section of jurisdiction is cleared up;Then the good static breaking agent of mixing is filled into the section of jurisdiction at middle part and static blasting is carried out to it, broken section of jurisdiction is cleared up;Finally the good static breaking agent of mixing is filled into the section of jurisdiction of lower part, static blasting is carried out to it, broken section of jurisdiction is cleared up.The present invention carries out the dismounting of molding tunnel duct piece using Static Blasting Technique, avoids the damage due to manually or mechanically abolishing bring personal injury and structural solid quality, reaches safe and efficient, muting construction, social benefit can not despise.

Description

The construction method of shield molding tunnel nullring section of jurisdiction is removed in a kind of static blasting
Technical field
The invention belongs to shield method tunnel construction technical fields, remove shield more particularly to a kind of static blasting and form tunnel The construction method of road nullring section of jurisdiction.
Background technique
Shield method tunnel construction is one of the main method of underground section Structural Engineering construction, according to the construction journey of the engineering method Sequence and feature need to carry out to remove into hole, nullring section of jurisdiction of appearing, and then construction reinforced bar coagulation after completing whole tunnel holing through Native ring beam.
In general, nullring section of jurisdiction is made of 3 calibrated bolcks, 2 adjacent blocks and 1 block that binds, it is longitudinal between each piece, circumferential Connected by high-strength bolt.Based on tunnel diameter 6200mm, smallest blocks bind block weight about 1.3t, other block weight are about 4.6t.During constructing tunnel, section of jurisdiction also provides shield machine counter-force, each piecemeal is in ring other than the supporting soil body, formation main structure To, it is longitudinal be extruded close, and after synchronous grouting and secondary back-grouting, concrete coagulation makes section of jurisdiction bonding securely, removes Block is bound in difficulty, especially 1 piece and 2 pieces of adjacent blocks are located at tunnel vault position, removes that there are great security risks.
The tunnel nullring section of jurisdiction of shield molding at present is removed, and is mostly manually set up platform, is abolished using pneumatic pick or water drilling. But piece is in charge of for dome portions, need to face upward operation, and difficulty of construction is big, inconvenient for operation;In addition, vault section of jurisdiction is in hanging shape State, weight is big, and operating personnel is in and is absolutely unsafe in environment, and security risk is very big.It cuts according to machinery, on the one hand vibrates Greatly, cause positive endless tube piece to destroy, influence tunnel structure stress and waterproof effect, on the other hand, noise is big, is unfavorable for civilization and applies Work.Therefore, seek a kind of safe and efficient, muting method for dismounting, it is particularly important.
Summary of the invention
The object of the present invention is to provide the construction methods that shield molding tunnel nullring section of jurisdiction is removed in a kind of static blasting, with solution Inconvenient, the problem that difficulty of construction is big and operating personnel's construction risk is big when certainly being removed using pneumatic pick or water drilling;And machine Tool cuts the problem for leading to that positive endless tube piece destroys and noise is big.
The technical scheme to solve the above technical problems is that
The construction method of shield molding tunnel nullring section of jurisdiction is removed in a kind of static blasting, and the nullring section of jurisdiction is by being located at top Section of jurisdiction, the section of jurisdiction positioned at middle part and the section of jurisdiction positioned at lower part constitute, using being bolted between adjacent section of jurisdiction;The construction party Method the following steps are included:
Step 1, it in the outer annular face cloth hole of the nullring section of jurisdiction, drills in cloth hole site;
Step 2, static blasting is carried out to section of jurisdiction step by step, broken section of jurisdiction is cleared up;
The good static breaking agent of mixing is filled into the section of jurisdiction on top first, static blasting is carried out to it, to broken pipe Piece is cleared up;
Then the good static breaking agent of mixing is filled into the section of jurisdiction at middle part and static blasting is carried out to it, to broken pipe Piece is cleared up;
Finally the good static breaking agent of mixing is filled into the section of jurisdiction of lower part, static blasting is carried out to it, to broken pipe Piece is cleared up.
The construction method of shield molding tunnel nullring section of jurisdiction, further, position are removed in present invention static blasting as described above There are two pieces, respectively F type section of jurisdiction and L2 type section of jurisdiction in the section of jurisdiction on top;Section of jurisdiction positioned at middle part has two pieces, respectively L1 Type section of jurisdiction and B2 type section of jurisdiction;Section of jurisdiction positioned at lower part has two pieces, respectively B1 type section of jurisdiction and B3 type section of jurisdiction.
The construction method of shield molding tunnel nullring section of jurisdiction, further, step are removed in present invention static blasting as described above In rapid 1, at a distance of 20cm~50cm between adjacent drill center, the depth of the drilling is 0.7~0.9 times of chip length, The aperture of the drilling is 30mm~50mm.
The construction method of shield molding tunnel nullring section of jurisdiction is removed in present invention static blasting as described above, it is preferable that root Different types of static breaking agent is selected according to Various Seasonal;Static breaking agent is powder stick type cracking agent, or conventional cracking agent, but It is to reduce the ratio of mud of recommendation in mixing static breaking agent, preferably 20%~25%.
The construction method of shield molding tunnel nullring section of jurisdiction is removed in present invention static blasting as described above, it is preferable that institute It states step 1 to specifically include, artificial erection construction platform, using air drill in cloth hole site pore-forming, then cleaning out drilling makes Anhydrous or sundries in drilling.
The construction method of shield molding tunnel nullring section of jurisdiction is removed in present invention static blasting as described above, it is preferable that In step 2, before the good static breaking agent of mixing is filled into section of jurisdiction, the dry and wet degree in drilling is checked, if the dry water suction of hole wall Property then first moistens hole wall with water purification by force.
The construction method of shield molding tunnel nullring section of jurisdiction is removed in present invention static blasting as described above, it is preferable that In step 2, it is packed into the drilling of section of jurisdiction in the hot preceding static breaking agent that mixing is good.
The construction method of shield molding tunnel nullring section of jurisdiction is removed in present invention static blasting as described above, it is preferable that When constructing in subzero temperature environment, using weight percent concentration be 1%~2% salt water or greater than the warm water of zero degrees celsius Mixing static breaking agent.
The beneficial effects of the present invention are:
Dismounting is divided into two parts work: concrete disintegrating and reinforcing bar are cut off.Using Static Blasting Technique in section of jurisdiction outer circumference On be evenly arranged hole location, easy to operate construction is convenient;Static blasting swelling agent is inserted, makes section of jurisdiction itself swelling fracture, by bulk Heavy weight vault concrete block is crushed, falls off.Then cooperate manual cleaning again, operating personnel is avoided directly to be crushed, disappear Except security risk.Remaining reinforcing bar is finally cut off, Demolition Construction is completed.Great advantage of the invention is concrete disintegrating and coagulation Soil block is removed successively to carry out in time, also avoids construction personnel and is exposed in the concrete block environment that may be fallen, pole The big safety for improving construction.In addition, generating during concrete disintegrating without any vibration, positive endless tube piece will not be destroyed, Realize purpose safe and efficient, that noiseless is environmentally friendly.
Detailed description of the invention
By made detailed description in conjunction with the following drawings, above-mentioned and/or other aspects of the invention and advantage will become It becomes apparent from and is easier to understand, these attached drawings are only schematical, are not intended to limit the present invention, in which:
Fig. 1 is that the construction method process that shield forms tunnel nullring section of jurisdiction is removed in the static blasting of an embodiment of the present invention Schematic diagram;
Fig. 2 is the nullring section of jurisdiction composition and cloth hole schematic diagram of an embodiment of the present invention;
Fig. 3 is the nullring section of jurisdiction blasting sequence schematic diagram of an embodiment of the present invention.
In attached drawing, parts list represented by the reference numerals are as follows:
1, B1 type section of jurisdiction, 2, B2 type section of jurisdiction, 3, B3 type section of jurisdiction, 4, L1 type section of jurisdiction, 5, L2 type section of jurisdiction, 6, F type section of jurisdiction, 7, company Connecting bolt, 8, drilling.
Specific embodiment
Hereinafter, the construction that shield molding tunnel nullring section of jurisdiction is removed in static blasting of the invention is described with reference to the accompanying drawings The embodiment of method.
The embodiment recorded herein is specific specific embodiment of the invention, for illustrating design of the invention, Be it is explanatory and illustrative, should not be construed as the limitation to embodiment of the present invention and the scope of the invention.Except what is recorded herein Outside embodiment, those skilled in the art can also based on the claim of this application book and specification disclosure of that using aobvious and The other technical solutions being clear to, these technical solutions include using any obvious to making for the embodiment recorded herein The technical solution of substitutions and modifications.
The attached drawing of this specification is schematic diagram, aids in illustrating design of the invention, it is schematically indicated the shape of each section And its correlation.It note that for the ease of clearly showing the structure of each component of the embodiment of the present invention, between each attached drawing Do not drawn according to identical ratio.Identical reference marker is for indicating identical part.
The construction method of shield molding tunnel nullring section of jurisdiction is removed in the static blasting that Fig. 1 shows an embodiment of the present invention, Comprising:
The technical scheme to solve the above technical problems is that shield is removed in a kind of static blasting forms tunnel nullring The construction method of section of jurisdiction, the nullring section of jurisdiction is by superposed section of jurisdiction, the section of jurisdiction positioned at middle part and the section of jurisdiction structure positioned at lower part At, between adjacent section of jurisdiction using bolt 7 connect;It is superposed in a kind of embodiment of nullring section of jurisdiction as shown in Figure 2 Section of jurisdiction has two pieces, respectively F type section of jurisdiction 6 and L2 type section of jurisdiction 5;Section of jurisdiction positioned at middle part has two pieces, respectively L1 type section of jurisdiction 4 With B2 type section of jurisdiction 2;Section of jurisdiction positioned at lower part has two pieces, respectively B1 type section of jurisdiction 1 and B3 type section of jurisdiction 3.
The construction method the following steps are included:
Step 1, in the outer annular face cloth hole of the nullring section of jurisdiction, the drilling 8 in cloth hole site;In reality as shown in Figure 1 It applies in example, at a distance of 20cm~50cm between adjacent 8 center of drilling, the depth of the drilling 8 is the 0.7~0.9 of chip length Times, the aperture of the drilling 8 is 30mm~50mm.For example, at a distance of 30cm, the depth of the drilling 8 between adjacent 8 center of drilling Degree is 0.9 times of chip length, and the aperture of the drilling 8 is 40mm.The depth of drilling and aperture are not lower than above-mentioned numerical value model The lower limit enclosed, the expansive force for preventing cracking agent from generating are not enough to broken section of jurisdiction.During a kind of Specific construction, the step 1 Including, artificial erection construction platform, using air drill in cloth hole site pore-forming, then drilling is cleaned out make it is anhydrous in drilling or Sundries.
Step 2, static blasting is carried out to section of jurisdiction step by step, broken section of jurisdiction is cleared up;By the good static crushing of mixing Before agent is filled into section of jurisdiction, the dry and wet degree in drilling is checked, first moisten hole wall with water purification if hole wall dries water imbibition by force.
The good static breaking agent of mixing is filled into the section of jurisdiction on top first, static blasting is carried out to it, to broken pipe Piece is cleared up;
Then the good static breaking agent of mixing is filled into the section of jurisdiction at middle part and static blasting is carried out to it, to broken pipe Piece is cleared up;
Finally the good static breaking agent of mixing is filled into the section of jurisdiction of lower part, static blasting is carried out to it, to broken pipe Piece is cleared up.In above-mentioned steps, in the drilling that is loaded into section of jurisdiction before the good static breaking agent of mixing is hot.
In above-mentioned steps, when constructing in subzero temperature environment, the salt for being 1%~2% using weight percent concentration Water or warm water mixing static breaking agent greater than zero degrees celsius.
In the construction method that shield molding tunnel nullring section of jurisdiction is removed in the static blasting of the above embodiment of the present invention, according to Various Seasonal selects different types of static breaking agent, such as section's green wood Beijing Science and Technology Ltd. in spring, autumn use II type soundless demolishing agent of high efficiency of HSCA-, 25 ± 5 DEG C of Applicable temperature;Section's green wood Beijing Science and Technology Ltd. in summer use I type soundless demolishing agent of high efficiency of HSCA-, 35 ± 5 DEG C of Applicable temperature;Section's green wood Beijing Science and Technology Ltd. in use in winter III type soundless demolishing agent of high efficiency of HSCA-, 10 ± 5 DEG C of Applicable temperature, then it is aided with the Maintenance in Winter measures such as heat preservation covering;Due to drilling For lateral aperture, it is preferable that static breaking agent is powder stick type cracking agent, or conventional cracking agent, but in mixing static breaking agent When the ratio of mud of recommendation is reduced, preferably 20%~25%, uniform mix, the face for becoming wet and loose is cotton-shaped or clay shape, then rubs with the hands Tamping in hole is filled at item and is blocked from outside, and 28%~33%, but the present invention are used as the II type cracking agent ratio of mud of HSCA- In, preferably 20%~25%.
Each technical characteristic of above-mentioned disclosure is not limited to disclosed and other feature combination, and those skilled in the art are also Can carry out other combinations between each technical characteristic according to the purpose of invention, be subject to realize the present invention purpose.

Claims (8)

1. the construction method of shield molding tunnel nullring section of jurisdiction is removed in a kind of static blasting, the nullring section of jurisdiction is by superposed Section of jurisdiction, the section of jurisdiction positioned at middle part and the section of jurisdiction positioned at lower part are constituted, using being bolted between adjacent section of jurisdiction;Its feature exists In, comprising the following steps:
Step 1, it in the outer annular face cloth hole of the nullring section of jurisdiction, drills in cloth hole site;
Step 2, static blasting is carried out to section of jurisdiction step by step, broken section of jurisdiction is cleared up;
The good static breaking agent of mixing is filled into the section of jurisdiction on top first, static blasting is carried out to it, to broken section of jurisdiction into Row cleaning;
Then by the good static breaking agent of mixing be filled into middle part section of jurisdiction in static blasting is carried out to it, to broken section of jurisdiction into Row cleaning;
Finally the good static breaking agent of mixing is filled into the section of jurisdiction of lower part, static blasting is carried out to it, to broken section of jurisdiction into Row cleaning;
The drilling is lateral aperture;Different types of static breaking agent is selected according to Various Seasonal;Static breaking agent is powder stick type Cracking agent, or conventional cracking agent, but reduce the ratio of mud of recommendation in mixing static breaking agent, preferably 20%~25%, Uniform mix, the face for becoming wet and loose is cotton-shaped or clay shape, then is twisted into item and fills in tamping in hole and block from outside.
2. the construction method of shield molding tunnel nullring section of jurisdiction is removed in static blasting according to claim 1, feature exists In superposed section of jurisdiction has two pieces, respectively F type section of jurisdiction and L2 type section of jurisdiction;There are two pieces positioned at the section of jurisdiction at middle part, respectively For L1 type section of jurisdiction and B2 type section of jurisdiction;Section of jurisdiction positioned at lower part has two pieces, respectively B1 type section of jurisdiction and B3 type section of jurisdiction.
3. the construction method of shield molding tunnel nullring section of jurisdiction is removed in static blasting according to claim 1, feature exists In, in step 1, at a distance of 20cm~50cm between adjacent drill center, the depth of the drilling be chip length 0.7~ 0.9 times, the aperture of the drilling is 30mm~50mm.
4. the construction method of shield molding tunnel nullring section of jurisdiction is removed in static blasting according to claim 1, feature exists In the step 1 specifically includes, artificial erection construction platform, then that drilling cleaning is dry using air drill in cloth hole site pore-forming Only make the interior anhydrous or sundries that drills.
5. the construction method of shield molding tunnel nullring section of jurisdiction is removed in static blasting according to claim 1-4, It is characterized in that, in step 2, before the good static breaking agent of mixing is filled into section of jurisdiction, check the dry and wet degree in drilling, if The dry water imbibition of hole wall then first moistens hole wall with water purification by force.
6. the construction method of shield molding tunnel nullring section of jurisdiction is removed in static blasting according to claim 1-4, It is characterized in that, in step 2, being packed into the drilling of section of jurisdiction in the hot preceding static breaking agent that mixing is good.
7. the construction method of shield molding tunnel nullring section of jurisdiction is removed in static blasting according to claim 1-4, It is characterized in that, when constructing in subzero temperature environment, the salt water for being 1%~2% using weight percent concentration or it is greater than The warm water mixing static breaking agent of zero degrees celsius.
8. the construction method of shield molding tunnel nullring section of jurisdiction is removed in static blasting according to claim 5, feature exists In, when constructing in subzero temperature environment, using weight percent concentration be 1%~2% salt water or be greater than zero degrees celsius Warm water mixing static breaking agent.
CN201610129540.9A 2016-03-08 2016-03-08 The construction method of shield molding tunnel nullring section of jurisdiction is removed in a kind of static blasting Active CN105736000B (en)

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