CN115094915A - Grooving construction method for slightly weathered volcanic geological underground continuous wall - Google Patents
Grooving construction method for slightly weathered volcanic geological underground continuous wall Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 189
- 238000005553 drilling Methods 0.000 claims abstract description 89
- 239000011435 rock Substances 0.000 claims abstract description 87
- 238000003801 milling Methods 0.000 claims abstract description 49
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 6
- 238000005755 formation reaction Methods 0.000 claims abstract description 6
- 230000002787 reinforcement Effects 0.000 claims description 20
- 238000009432 framing Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 230000010354 integration Effects 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000002689 soil Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/06—Foundation trenches ditches or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
- E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
- E02F5/08—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with digging wheels turning round an axis
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Abstract
The invention relates to a slightly weathered volcanic geological underground continuous wall grooving construction method, which is applied to slightly weathered volcanic rock formations with the hardness of 150MPa-210MPa, and is divided into a plurality of construction units according to the size of construction grooves and the specification of construction equipment; the construction unit comprises an initial opening unit and a closing unit, the initial opening unit and the closing unit are sequentially and alternately arranged, and both ends of the construction groove are the initial opening units; the adjacent first opening unit and the closing unit are arranged in an occlusion way; the drilling and milling device has the advantages that the holes are respectively arranged in the first opening unit and the closing unit according to requirements, the holes are drilled and drilled firstly, then, the rocks between the holes are milled, grooving is realized, in construction, a plurality of construction units are alternately constructed, after the holes are drilled and completed by one construction unit, the rocks between the adjacent holes are milled and drilled by the construction unit, meanwhile, the holes are drilled and drilled by the other construction unit, reasonable combination of drilling and milling is realized, the construction progress of grooving of the micro volcanic geological underground diaphragm wall is accelerated, the construction efficiency of the whole construction groove is improved, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of construction of slightly weathered geological ultra-deep underground continuous walls, in particular to a grooving construction method for slightly weathered volcanic geological underground continuous walls.
Background
Grooving is a prerequisite for continuous wall construction. Because the geological environment for constructing the ultra-deep underground continuous wall is complicated, a soil grabbing grooving construction method is generally adopted during grooving construction of a soft soil layer, but for a slightly weathered special stratum, the hardness of rocks is high, and a soil grabbing grooving machine cannot meet the construction requirement.
The double-wheel slot milling machine is the most advanced slot forming construction equipment developed for meeting the requirements of hard strata and rock deep underground continuous wall construction. In the grooving construction of granite stratums, the double-wheel groove milling machine has the advantages of high grooving efficiency, good construction quality, stable and reliable equipment performance and the like. The double-wheel slot milling machine can be divided into a cone-wheel slot milling machine and a roller slot milling machine, the roller slot milling machine can meet the requirement of forming slots in strata with the strength within 50MPa, and the cone-wheel slot milling machine can meet the requirement of forming slots in strata with the strength of 50-200 MPa.
Although some projects adopt a drilling and milling combined construction method for grooving hard rock at present, mainly aiming at the construction of the hard rock with the pressure of 80-100MPa, the discussion is only about the hard rock with the pressure of more than 100 MPa.
When the slightly weathered volcanic rock stratum is encountered, the average uniaxial compressive strength of the rock is 130MPa, and the highest uniaxial compressive strength is more than 210 MPa. The strength of the slightly weathered volcanic rock layer is too high, and the rock is directly milled by adopting double-wheel milling, and the average footage is 20-50 mm/day, even the footage is basically not made. Therefore, grooving in a slightly weathered volcanic rock stratum is a difficult point which needs to be solved urgently in grooving construction of continuous walls in some ultra-deep and important projects.
Disclosure of Invention
The invention aims to provide a slightly weathered volcanic geological underground continuous wall grooving construction method, which aims to solve the problem that the conventional volcanic geological formation is difficult to groove efficiently.
In order to realize the purpose, the invention adopts the following technical scheme:
a grooving construction method for a slightly weathered volcanic geological underground continuous wall comprises the following steps:
the method is applied to slightly weathered volcanic rock formations with the hardness of 150MPa-210 MPa;
the method comprises the following steps:
dividing a construction groove into a plurality of construction units according to the size of the construction groove and the specification of construction equipment, wherein the length of each construction unit is one, and two sides of each construction unit are defined as framing lines;
the construction unit comprises an initial opening unit and a closing unit, the initial opening unit and the closing unit are sequentially and alternately arranged, and both ends of the construction groove are the initial opening units;
step two, the adjacent first opening units and the adjacent closing units are arranged in an occlusion mode, the width separating lines at one ends of the first opening units are located in the adjacent closing units, and the width separating lines at one ends of the closing units are located in the adjacent first opening units;
arranging guide holes, namely arranging the guide holes in the initial opening unit according to design requirements, and arranging the guide holes in the closing unit according to the design requirements;
fourthly, conducting lead hole drilling on the construction unit A, conducting lead hole drilling on the construction unit B after the lead hole drilling is completed, and meanwhile milling adjacent lead holes of the construction unit A which has completed the lead hole drilling to form grooves; the construction of the plurality of construction units is alternated until all the first opening units and the closing units contained in the whole construction groove complete the groove forming construction, namely the groove forming construction of the whole construction groove is completed;
the construction is started from the first opening unit positioned at the head end of the construction tank, and then the construction of other first opening units or the closed units is carried out, but the construction of a certain closed unit is required to be completed before the construction of two first opening units adjacent to the front and the rear of the closed unit is completed.
Preferably, in the second step, a distance between a framing line of the first opening unit in the adjacent closing unit and a framing line of the second opening unit in the adjacent closing unit is an occlusion size, and the occlusion size L is Occlusion is realized 150-300 mm;
also comprises the following steps:
after the initial opening unit finishes milling to form a groove, immediately performing continuous wall construction of the initial opening unit, putting a reinforcement cage into the initial opening unit and pouring concrete, wherein I-shaped steel is welded at the end part of the reinforcement cage;
and after the closed unit adjacent to the initial opening unit finishes milling to form a groove, a reinforcement cage is placed in the closed unit, the reinforcement cage is meshed and connected with I-shaped steel on the reinforcement cage in the adjacent initial opening unit, and then concrete is poured to realize integration of the diaphragm wall.
Preferably, in the third step, 6 lead holes are arranged in the first opening unit, the distance between every two adjacent lead holes is the same, the circle centers of the lead holes at the two ends are located outside the dividing line, and the distance L1 between the circle center and the dividing line is 30-150 mm; the shortest distance L2 between adjacent lead holes is 200-300 mm.
Preferably, in the third step, the closed unit is provided with 2-5 guide holes, the guide holes are arranged at intervals, the circle center distance L3 between adjacent guide holes is 1100-1250 mm, and the shortest distance L4 is greater than 150 mm.
Preferably, in the fourth step, the guide holes of the construction units are drilled in the depth direction through rotary drilling equipment, and after each drilling of the guide hole of one construction unit is completed, each adjacent guide hole of the construction unit is milled through a double-wheel slot milling machine.
Preferably, the drilling progress of the rotary drilling equipment is 10-50 mm/h;
when the non-rock surface is drilled, when the rock hardness is in the range of 100-130MPa, the drilling progress is 50 mm/h; when the rock hardness is in the range of 130-160MPa, the drilling progress is 30 mm/h; when the rock hardness is in the range of 160-200MPa, the drilling progress is 20 mm/h; when the hardness of the rock exceeds 200MPa, the drilling progress is 10 mm/h; when drilling a rock face, the drilling progress is halved.
Preferably, the milling progress of the double-wheel slot milling machine is 10-50 mm/h;
when the rock hardness is 100-; when the rock hardness is 130-; when the rock hardness is 160-; when the hardness of the rock exceeds 200MPa, the milling progress is 10 mm/h.
Preferably, the construction method further comprises the steps of,
the preparation method comprises the following steps: 1. measuring and paying off; 2. sampling, namely, acquiring basic hardness, depth distribution information and rock surface fluctuation conditions of volcanic rock layers in the groove sections through exploration drilling sampling; 3. conducting guide wall construction; 4. preparing concrete slurry, and controlling the viscosity of the concrete slurry to be 35-45 s; 5. according to the current construction groove section requirement information, selecting the rotary drilling equipment and the double-wheel groove milling machine with proper models according to the groove forming thickness, and enabling the drilling diameter of the rotary drilling equipment, the groove forming width of the double-wheel groove milling machine and the groove section requirement information to be consistent.
Preferably, the construction method further comprises the step of entering the rock and grabbing the groove: in the specific construction of a groove section, the basic depth distribution information of the volcanic rock layer and the rock surface fluctuation condition obtained by sampling are referred, and a hydraulic groove wall machine is adopted to carry out grab bucket operation, so that the grooving construction before the current construction groove section enters the rock is completed.
Compared with the prior art, the invention has the beneficial effects that:
the construction method is mainly applied to 150-210 MPa slightly weathered volcanic rock formations, the construction grooves are reasonably divided into a plurality of construction units, one construction unit is one, parallel construction of a plurality of construction units can be achieved, construction efficiency is improved, construction period is shortened, meanwhile, hole leading design is respectively carried out on each construction unit, reasonable design of hole leading size and space between the holes is achieved, drilling and cutting of the holes are carried out, then, rock between the holes is milled, grooving is achieved, reasonable combination of drilling and milling is achieved, construction progress of grooving of the slightly weathered volcanic geological underground continuous wall is accelerated, construction efficiency of the whole construction groove is improved, construction failure rate is reduced, and cost is saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic distribution diagram of framing construction units of a construction groove section provided in an embodiment of the present invention.
Fig. 2 is a schematic diagram of a hole arrangement of the initial opening unit provided in the embodiment of the present invention.
Fig. 3 is a schematic view of a hole arrangement of a closing unit provided in an embodiment of the present invention.
Description of the reference numerals:
1. a first opening unit; 2. a closing unit; 3. dividing a width line; 4. leading holes;
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides a slightly weathered volcanic geological underground continuous wall grooving construction method, which is applied to slightly weathered volcanic rock formations with the hardness of 150MPa-210MPa, and comprises the following preparation steps:
1. measuring and paying off, measuring and determining the environmental size of the construction groove, and setting a marking lead;
2. sampling, namely, surveying and sampling each underground continuous wall in combination with paying off of the underground continuous wall, knowing basic hardness and depth distribution information of a volcanic rock layer in a construction groove, and roughly mastering the rock surface fluctuation condition, wherein the length of each frame corresponds to the frame length of a construction unit, such as 6 meters;
3. conducting wall construction outside the rock stratum;
4. the preparation method comprises the following steps of preparing concrete slurry, wherein the volcanic grooving period is long, and in order to prevent hole collapse, the viscosity of the slurry is controlled to be 35-45 s, preferably 40 s.
5. According to the current construction groove section requirement information, selecting the rotary drilling equipment and the double-wheel groove milling machine with proper models according to the groove forming thickness, and enabling the drilling diameter of the rotary drilling equipment, the groove forming width of the double-wheel groove milling machine and the groove section requirement information to be consistent. For example, if the thickness of the current construction groove section is required to be 1000mm, a rotary drilling device with the diameter of 1000mm and a double-wheel milling grooving machine with the diameter of 2800mm × 1000mm are selected.
And then starting the construction steps of the rock stratum, which specifically comprise:
dividing a plurality of construction units according to the size of a construction groove and the specification of construction equipment;
dividing the construction groove into a plurality of construction units by taking 6m as the width length according to the length requirement of the required construction groove section, wherein the length of each construction unit is one, namely 6m is long, and two sides of each construction unit are defined as amplitude lines;
as shown in the attached drawing 1, the construction unit is divided into an initial opening unit 1 and a closing unit 2, the initial opening unit 1 and the closing unit 2 are sequentially and alternately arranged, and both ends of the construction groove are the initial opening unit 1;
step two, the adjacent first opening unit 1 and the adjacent closing unit 2 are arranged in an occlusion manner, namely, the framing line 3 at one end of the first opening unit 1 is positioned in the adjacent closing unit 2, the framing line 3 at one end of the closing unit 2 is positioned in the adjacent first opening unit 1, as shown in the attached drawing 1, the occlusion size L is Occlusion (occlusion) 150-300 mm, preferably 200 mm;
thirdly, carrying out arrangement design on the lead holes 4, and carrying out arrangement design on the lead holes 4 on each construction unit according to the framing structure of the construction groove section, wherein the hardness of the slightly weathered volcanic rock is extremely high, and the distance between the lead holes 4 has specific requirements, and the specific design method comprises the following steps:
as shown in fig. 2, for the first-opening unit 1, 6 lead holes 4 are arranged, and the distances between adjacent lead holes 4 are the same, the centers of the lead holes 4 located at the two ends of the first-opening unit 1 are located outside the dividing line 3, and the distance L1 between the center of the circle and the dividing line 3 is 30-150 mm, preferably, L1 is 150 mm. The distance from the frame line to the outer edge of the lead hole is the outward release, namely the outward release is L1+ the radius of the lead hole, and the L1 is arranged for the purpose of meshing the first opening unit and the closing unit. The shortest distance L2 between two adjacent lead holes 4 is 200-300 mm, preferably L2 is 260mm, and the shortest distance is the difference between the circle center distance of two adjacent lead holes 4 and the diameter of the lead hole 4.
As shown in fig. 3, for the closing unit 2, 2 to 5 lead holes 4 are arranged, the lead holes 4 are arranged at intervals, the distance L3 between centers of adjacent lead holes 4 is 1100 to 1250mm, the shortest distance L4 is greater than 150mm, and the distances L4 between adjacent lead holes 4 may be different from each other, for example, the shortest distance L4 between the first lead hole 4 and the second lead hole 4 is 150mm, and the shortest distance L4 between the second lead hole 4 and the third lead hole 4 is 200 mm. Due to the snap-fit arrangement of the first opening unit 1 and the closing unit 2, the holes 4 at the two ends of the closing unit 2 are spaced apart from the separator 3 of the first opening unit 1 in the closing unit 2 by a distance L5, preferably, L5 is 100 mm. The significance of setting the spacing L5 is: because the closed units can be constructed only after the initial opening units at two ends complete slotting construction, and the continuous wall construction needs to be carried out immediately after the initial opening units complete milling and slotting, when the closed units are drilled, the adjacent initial opening units are filled with concrete by using the reinforcing cages, and the reserved L5 is convenient for milling and slotting among the lead holes of the closed units and meshing between the initial opening units and the closed units.
And step four, constructing one or more construction units according to the distribution of the construction units designed in the framing manner.
The method comprises the following conditions:
1. firstly, completing construction of all first-opening units, and then performing construction of closed units;
2. the construction method comprises the steps of firstly constructing the first opening unit at the head end of the construction groove, then constructing the other first opening unit or the other closed unit, wherein the construction units are not necessarily adjacent, and the construction of the closed units is carried out on the premise that the first opening units at the front end and the rear end of each closed unit are all constructed.
In the construction of a concrete groove section, the grab bucket operation is carried out by adopting a hydraulic groove wall machine by referring to the basic depth distribution information of the volcanic rock layer and the rock surface fluctuation condition obtained by sampling, and the grooving construction before the rock entering of the current construction groove section is completed; and then carrying out rock entering grooving construction on the current construction groove section in a drilling and milling combined mode.
In order to improve the construction efficiency, after the drilling of the guide hole 4 in one construction unit A is completed by the rotary drilling equipment, the guide hole in the next construction unit B is drilled continuously, meanwhile, the construction unit A which completes the guide hole drilling is milled by using a double-wheel groove washing machine, the drilling and milling are sequentially and circularly performed alternately, the drilling and milling are performed simultaneously and continuously, the whole construction efficiency is improved, and the construction of all the construction units of the whole construction groove is completed. The construction unit A and the construction unit B can be non-adjacent and can be flexibly selected according to engineering requirements.
In an embodiment, a construction method of completing construction of all first-opened units and then performing construction of closed units is adopted, and the specific construction steps include:
the method comprises the steps of conducting hole drilling on a first opening unit A at the head end of a construction groove, after the hole drilling is completed, selecting any one of first opening units B to conduct hole drilling, simultaneously milling adjacent holes of the first opening units A to form grooves, conducting continuous wall construction on the first opening units A immediately after the first opening units A form the grooves to prevent collapse, placing a reinforcement cage into the grooves, pouring concrete, welding I-shaped steel at the end of the reinforcement cage to prevent slurry leakage during concrete pouring, and enabling the I-shaped steel to bear the lateral pressure of a soil body; then the first opening unit B completes drilling, any one of the first opening units C is selected for hole drilling, meanwhile, adjacent holes of the first opening unit B are milled to form grooves, and similarly, after the first opening unit B forms grooves, continuous wall construction is immediately carried out on the first opening unit B; the construction is sequentially and alternately carried out until all the first-opened units form the grooves, and then the closed units are constructed, namely, after the last first-opened unit finishes the drilling of the lead holes, the closed unit with the front and back adjacent first-opened units forming the grooves is selected for construction, the drilling of the lead holes is started, and meanwhile, the adjacent lead holes of the last first-opened unit are milled to form the grooves; after the last first-opening unit is grooved, the continuous wall construction is immediately carried out; at the moment, all the closed units are in the condition that front and back adjacent first-opening units are constructed, therefore, after the closed units complete hole guiding drilling, any closed unit is selected to conduct hole guiding drilling, meanwhile, the closed units completing the hole guiding drilling utilize a double-wheel groove washing machine to conduct groove milling, after the closed units are grooved, a reinforcement cage is placed in the groove, the reinforcement cage is connected with I-steel on the reinforcement cage in the adjacent first-opening units in an occluded mode, concrete is poured, the integration of the continuous wall is achieved, the waterproof effect of the continuous wall is improved, meanwhile, drilling and milling are conducted on the two closed units in parallel, the construction efficiency is improved, and the whole construction groove is completed until all the closed units are grooved and constructed.
In another embodiment, a construction method is adopted in which an initial opening unit at the head end of a construction tank is constructed first, and then another initial opening unit or another closed unit is constructed, and the specific construction steps include:
as shown in the attached figure 1, a first opening unit A at the head end of a construction groove is drilled with a lead hole, after the drilling of the lead hole is completed, a next first opening unit B is drilled with the lead hole, meanwhile, adjacent lead holes of the first opening unit A are milled into grooves, after the first opening unit A is grooved, continuous wall construction is immediately carried out on the first opening unit A, collapse is prevented, a reinforcement cage is placed in the grooves, concrete is poured, I-shaped steel is welded at the end of the reinforcement cage, slurry leakage during concrete pouring is prevented, and the I-shaped steel can bear the lateral pressure of a soil body; then the first opening unit B completes drilling, a next first opening unit C is selected for hole drilling, meanwhile, adjacent holes of the first opening unit B are milled to form grooves, and similarly, after the first opening unit B forms grooves, continuous wall construction is immediately carried out on the first opening unit B; after the first opening unit C finishes the drilling of the lead holes, selecting the closed unit A positioned between the first opening unit A and the first opening unit B for the drilling of the lead holes, and simultaneously milling the adjacent lead holes of the first opening unit C into grooves; similarly, after the first opening unit C is grooved, the continuous wall construction is immediately carried out; after the closed unit A finishes hole guiding and drilling, the closed unit B between the first-opening unit B and the first-opening unit C is selected for hole guiding and drilling, meanwhile, a double-wheel groove washing machine is utilized for milling and grooving the closed unit A, after the closed unit A is grooved, a reinforcement cage is placed in the groove, the reinforcement cage is meshed and connected with I-steel on the reinforcement cages in the adjacent first-opening unit A and the adjacent first-opening unit B, concrete is poured, the integration of the continuous wall is achieved, the waterproof effect of the continuous wall is improved, meanwhile, drilling and milling are conducted on the two closed units in parallel, the construction efficiency is improved, all the first-opening units and all the closed units are grooved and constructed, and the whole construction groove is finished.
When the rotary drilling equipment is adopted to drill the guide hole 4 in the first opening unit 1 or the closing unit 2, and the sampled hardness of the volcanic rock is combined, the drilling progress is controlled to protect the rotary drilling equipment, the drilling progress of the rotary drilling equipment is 10-50mm/h, excessive abrasion of a drill bit of the rotary drilling equipment is prevented, and when the hardness of the rock is within the range of 100-130MPa, the drilling progress is 50mm/h when the rock is drilled on a non-rock surface; when the rock hardness is in the range of 130-160MPa, the drilling progress is 30 mm/h; when the rock hardness is in the range of 160-200MPa, the drilling progress is 20 mm/h; when the hardness of the rock exceeds 200MPa, the drilling progress is 10 mm/h; when drilling on the rock face, the drilling progress is halved to ensure the perpendicularity of the hole. Because the rock is not flat underground and may fluctuate, the rock surface is easy to incline, the drill bit drills down vertically to drill on the rock surface, and equivalently drills on a slope, the drill bit is easy to have a 360-degree range, stress is applied while no rock is cut, the stress on the periphery is not applied, and the stress on the periphery is unbalanced, so that the lead drilling inclination is easy to cause, especially for a high-hardness slightly weathered volcanic rock address, therefore, when drilling on the rock surface, the drilling progress needs to be reduced to ensure the verticality of the hole, specifically, according to the rock hardness of the rock surface, the non-rock surface drilling progress corresponding to the same rock hardness is halved, namely when the rock hardness is in the range of 100-130MPa, the drilling progress is 25 mm/h; when the rock hardness is in the range of 130-160MPa, the drilling progress is 15 mm/h; when the rock hardness is in the range of 160-; when the hardness of the rock exceeds 200MPa, the drilling progress is 5 mm/h.
When a double-wheel groove milling machine is adopted to mill grooves between adjacent guide holes 4 in the first opening unit 1 or the closed unit 2, the milling progress is reasonably controlled by combining the hardness of volcanic rocks, and when the hardness of the rocks is 100 plus 130MPa, the groove milling progress is 50 mm/h; when the rock hardness is 130-; when the rock hardness is 160-200MPa, the groove milling progress is 20 mm/h; when the hardness of the rock exceeds 200MPa, the groove milling progress is 10 mm/h.
According to the technical scheme, the construction groove is reasonably divided into the plurality of construction units, the construction is performed in a segmented mode, the lead holes 4 of the construction units are distributed, the lead holes 4 are drilled, then the rocks between the lead holes 4 are milled, grooving is achieved, grooving construction progress and working efficiency of the slightly weathered volcanic stratum diaphragm wall are improved, construction failure rate is reduced, and cost is saved.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (9)
1. A slightly weathered volcanic geological underground continuous wall grooving construction method is characterized by being applied to slightly weathered volcanic rock formations with the hardness of 150MPa-210 MPa;
the method comprises the following steps:
dividing a construction groove into a plurality of construction units according to the size of the construction groove and the specification of construction equipment, wherein the length of each construction unit is one, and two sides of each construction unit are defined as framing lines;
the construction unit comprises an initial opening unit and a closing unit, the initial opening unit and the closing unit are sequentially and alternately arranged, and both ends of the construction groove are the initial opening units;
step two, the adjacent first opening units and the adjacent closing units are arranged in an occluded mode, the framing lines at one ends of the first opening units are located in the adjacent closing units, and the framing lines at one ends of the closing units are located in the adjacent first opening units;
arranging guide holes, namely arranging the guide holes in the initial opening unit according to design requirements, and arranging the guide holes in the closing unit according to the design requirements;
fourthly, conducting lead hole drilling on the construction unit A, conducting lead hole drilling on the construction unit B after the lead hole drilling is completed, and meanwhile milling adjacent lead holes of the construction unit A which has completed the lead hole drilling to form grooves; the construction of the plurality of construction units is alternated until all the first opening units and the closing units contained in the whole construction groove complete the groove forming construction, namely the groove forming construction of the whole construction groove is completed;
the construction is started from the first opening unit positioned at the head end of the construction groove, and then the construction of other first opening units or the closed units is carried out, but for the construction of a certain closed unit, the construction of two first opening units adjacent to the front and the back of the closed unit is required to be completed.
2. The method for grooving the slightly weathered volcanic geological underground continuous wall according to claim 1, wherein in the second step, the distance between the width line of the adjacent closed units of the first opening units and the width line of the adjacent first opening units of the closed units is an engagement dimension, and the engagement dimension L is Occlusion (occlusion) 150-300 mm;
also comprises the following steps:
after the initial opening unit finishes milling to form a groove, the continuous wall construction of the initial opening unit is carried out immediately, a reinforcement cage is placed in the initial opening unit and concrete is filled in the initial opening unit, and I-shaped steel is welded at the end part of the reinforcement cage;
and after the closed unit adjacent to the initial opening unit finishes milling to form a groove, a reinforcement cage is placed in the closed unit, the reinforcement cage is meshed and connected with I-shaped steel on the reinforcement cage in the adjacent initial opening unit, and then concrete is poured to realize integration of the diaphragm wall.
3. The method for grooving the underground diaphragm wall in the slightly weathered volcanic geological mode according to claim 1, wherein in the third step, 6 lead holes are arranged in the first opening unit, the distance between every two adjacent lead holes is the same, the centers of the lead holes at two ends are located outside the dividing line, and the distance L1 between the center of the circle and the dividing line is 30-150 mm; the shortest distance L2 between adjacent lead holes is 200-300 mm.
4. The slightly weathered volcanic geological underground continuous wall grooving construction method according to claim 1, wherein in the third step, 2-5 guide holes are arranged in the closed unit, the guide holes are arranged at intervals, the circle center distance L3 between adjacent guide holes is 1100-1250 mm, and the shortest distance L4 is larger than 150 mm.
5. The slightly weathered volcanic geological underground continuous wall grooving construction method according to claim 1, wherein in the fourth step, the guide holes of the construction units are drilled in the depth direction through rotary drilling equipment, and after drilling of one guide hole of the construction unit is completed, adjacent guide holes of the construction unit are milled through a double-wheel groove milling machine.
6. The trenching construction method of the slightly weathered volcanic geological underground continuous wall as claimed in claim 5, wherein the drilling progress of the rotary drilling equipment is 10-50 mm/h;
when the non-rock surface is drilled, when the rock hardness is in the range of 100-130MPa, the drilling progress is 50 mm/h; when the rock hardness is in the range of 130-160MPa, the drilling progress is 30 mm/h; when the rock hardness is in the range of 160-200MPa, the drilling progress is 20 mm/h; when the hardness of the rock exceeds 200MPa, the drilling progress is 10 mm/h; when drilling a rock face, the drilling progress is halved.
7. The slightly weathered volcanic geological underground continuous wall grooving construction method according to claim 5, wherein the milling progress of the double-wheel groove milling machine is 10-50 mm/h;
when the rock hardness is 100-; when the rock hardness is 130-; when the rock hardness is 160-; when the hardness of the rock exceeds 200MPa, the milling progress is 10 mm/h.
8. The trenching construction method of the slightly weathered volcanic geological underground diaphragm wall as claimed in claim 1, further comprising the steps of,
the preparation method comprises the following steps: 1. measuring and paying off; 2. sampling, namely, acquiring basic hardness, depth distribution information and rock surface fluctuation conditions of volcanic rock layers in the groove sections through exploration drilling sampling; 3. conducting guide wall construction; 4. preparing concrete slurry, and controlling the viscosity of the concrete slurry to be 35-45 s; 5. according to the current construction groove section requirement information, selecting the rotary drilling equipment and the double-wheel groove milling machine with proper models according to the groove forming thickness, and enabling the drilling diameter of the rotary drilling equipment, the groove forming width of the double-wheel groove milling machine and the groove section requirement information to be consistent.
9. The trenching construction method of the slightly weathered volcanic geological underground continuous wall as claimed in claim 8, further comprising the step of digging into a rock and grabbing a trench: in the specific construction of a groove section, the basic depth distribution information of the volcanic rock layer and the rock surface fluctuation condition obtained by sampling are referred, and a hydraulic groove wall machine is adopted to carry out grab bucket operation, so that the grooving construction before the current construction groove section enters the rock is completed.
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