CN111042107B - Large-size precast pile enclosure construction system and construction method - Google Patents
Large-size precast pile enclosure construction system and construction method Download PDFInfo
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- CN111042107B CN111042107B CN201911356397.7A CN201911356397A CN111042107B CN 111042107 B CN111042107 B CN 111042107B CN 201911356397 A CN201911356397 A CN 201911356397A CN 111042107 B CN111042107 B CN 111042107B
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- 238000010276 construction Methods 0.000 title claims abstract description 53
- 238000005553 drilling Methods 0.000 claims abstract description 81
- 238000012423 maintenance Methods 0.000 claims abstract description 10
- 239000011440 grout Substances 0.000 claims abstract description 9
- 239000004568 cement Substances 0.000 claims description 20
- 239000002002 slurry Substances 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 239000003973 paint Substances 0.000 claims description 8
- 230000005484 gravity Effects 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 3
- 238000007569 slipcasting Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
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Classifications
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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
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/04—Guide devices; Guide frames
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/06—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers for observation while placing
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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
- E02D5/22—Piles
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
- E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
- E02D5/526—Connection means between pile segments
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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
- E02D5/22—Piles
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a large-size precast pile maintenance structure construction system and a construction method, which comprise the following steps: a rotary drilling rig; a positioning device: the prefabricated pile supporting device comprises an annular first supporting plate, wherein a plurality of first supporting legs are connected to the edge position of the bottom surface of the first supporting plate in a threaded manner, a mounting plate coaxial with the first supporting plate is fixed on the first supporting plate, the mounting plate is provided with a laser ranging device matched with the central point and the angular point position of a prefabricated pile, the first supporting plate is further provided with a plurality of arc-shaped holes, and the axes of the arc-shaped holes are positioned on the circumference coaxial with the first supporting plate; grouting device: for injecting grout into the borehole; pile splicing device: the prefabricated pile supporting device comprises a second supporting plate, wherein a plurality of second supporting legs are fixed on the bottom surface of the second supporting plate, the second supporting plate is connected with a guide plate through a leveling part, the guide plate and the second supporting plate are coaxially arranged, and holes matched with the cross section of a prefabricated pile are formed in the center positions of the guide plate and the second supporting plate; the hoisting device and the construction system solve the problem of few construction equipment on a construction site.
Description
Technical Field
The invention relates to the technical field of underground engineering, in particular to a large-size precast pile enclosure construction system and a construction method.
Background
When a subway deep foundation pit is excavated by an open excavation method of urban rail transit engineering, traffic needs to be closed in advance, a construction enclosure is erected, earth excavation operation can be carried out after an enclosure structure is constructed, a bottom plate, a platform layer side wall, a middle plate, a station hall layer side wall and a top plate are constructed sequentially, a first support is removed, earth is backfilled, and traffic is restored, so that a subway station is constructed. The deep foundation pit support structure of the urban rail transit engineering mainly comprises: the method comprises the following steps of drilling a cast-in-place pile and an inner support, an underground continuous wall and an inner support, an SMW construction method pile and an inner support, and a precast pile and an inner support; the form that the building envelope adopts stake + interior support in prefabrication has been used successfully wherein.
The main construction steps of the large-size prefabricated fender post (the section size is larger than or equal to 700 multiplied by 700mm) are as follows: the method comprises the steps of firstly adopting a long spiral drilling machine (suitable for soil layers) or a double-power long spiral down-the-hole hammer drilling machine (suitable for rock strata) to perform drilling operation, rotating and spraying slurry to a designed elevation during lifting, then placing a pile splicing platform for positioning to a specified position and fixing, slightly lifting a precast pile by adopting a crawler crane or a truck crane with enough tonnage, then sinking the precast pile to the bottom of a drilled hole through a lifting platform, and when the precast pile sinks, firstly spraying cement-soil slurry in the drilled hole to rise after being extruded to tightly wrap the precast pile so as to form compact filling, and playing a role in supporting a precast pile structure in the process of digging a foundation pit.
However, the number of the long-spiral drilling machines or the dual-power long-spiral down-the-hole hammer drilling machines is small, the equipment cost is high, and the number of the long-spiral drilling machines and the dual-power long-spiral down-the-hole drilling machines on the equipment site is large, so that the mechanical equipment is lacked in the field construction process.
The rotary drilling rig has various forms and a large number, is low in equipment cost, and can meet the construction requirements of a plurality of large subway foundation pit enclosing structures, but the inventor finds that the rotary drilling rig is difficult to directly apply to the construction of the large precast pile enclosing structure due to poor hole forming positioning, verticality and depth control precision, so that how to apply the rotary drilling rig with various forms and a large number to construct the large precast pile enclosing structure becomes a new problem to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a large-size precast pile enclosure construction system, realizes drilling by using a rotary drilling rig, and solves the problem of lack of equipment during construction of the large-size precast pile enclosure.
In order to achieve the purpose, the invention adopts the following technical scheme:
a large-size precast pile maintenance structure construction system includes:
a rotary drilling rig: the drilling machine is used for drilling;
a positioning device: the prefabricated pile drilling device comprises an annular first supporting plate, wherein a plurality of first supporting legs are in threaded connection with the edge position of the bottom surface of the first supporting plate, a mounting plate coaxial with the first supporting plate is fixed on the first supporting plate, a laser ranging device matched with the central point and the angular point position of a prefabricated pile is arranged on the mounting plate, a plurality of arc-shaped holes are further formed in the first supporting plate, the axes of the arc-shaped holes are located on the circumference coaxial with the first supporting plate, paint can be sprayed to the ground to be drilled through the arc-shaped holes, and the drilling positions are identified;
grouting device: for injecting grout into the borehole;
pile splicing device: the prefabricated pile supporting device comprises a second supporting plate, wherein a plurality of second supporting legs are fixed on the bottom surface of the second supporting plate, the second supporting plate is connected with a guide plate through a leveling part, the guide plate and the second supporting plate are coaxially arranged, and holes matched with the cross section of a prefabricated pile are formed in the center positions of the guide plate and the second supporting plate;
hoisting accessory: the method is used for hoisting the precast pile.
Furthermore, be provided with first bubble type spirit level on the first backup pad for show the levelness of first backup pad.
Furthermore, a second bubble type level meter is arranged on the guide plate and used for displaying the levelness of the guide plate.
Further, leveling piece is including setting up the screw rod for the central symmetric distribution of deflector, the screw rod top stretches into the spacing groove that the deflector set up, and screw rod bottom and second backup pad threaded connection rotate the screw rod, can carry out the leveling to the deflector, the axiality of deflector and second backup pad can be guaranteed to the spacing groove.
Furthermore, the hoisting device comprises a first crane and a second crane, the hoisting part of the first crane can be connected with the top surface of the precast pile, and the hoisting part of the second crane can be connected with the side surface of the precast pile.
Further, the slip casting device includes the slip casting pipe, the slip casting pipe is connected with the grouting pump, and the grouting pump can drive cement thick liquid and pour into the drilling through the slip casting pipe in.
The invention also discloses a construction method of the large-size precast pile maintenance structure construction system, which comprises the following steps:
step 1: and positioning the first positioning point in the center of the drilling hole and second positioning points corresponding to four corner points of the precast pile.
Step 2: the positioning device is placed on the ground to be drilled, the laser ranging device corresponding to the center point of the precast pile on the mounting plate is aligned to the first positioning point, the laser ranging device corresponding to the four corner points of the precast pile on the mounting plate is aligned to the second positioning point, the first supporting leg is marked at the fixed position on the ground, the first supporting plate is leveled by the first supporting leg, the ground to be drilled is sprayed with paint by the arc-shaped hole, and the drilling position is marked.
And step 3: and (5) moving away the positioning device, aligning the teeth of the drill bit of the rotary drilling rig with the marks of the drilling positions, and drilling by using the rotary drilling rig.
And 4, step 4: and fixing the positioning device on the ground again by using the mark of the first support leg at the ground fixing position, measuring the depth and the verticality of the drilled hole by using the laser ranging device, and correcting the drilled hole with unqualified depth and verticality until the drilled hole meets the set requirement.
And 5: and (5) removing the positioning device, and grouting the borehole by using the grouting device.
Step 6: and fixing the pile splicing device on the bottom surface, coaxially arranging the guide plate, the second support plate and the drill hole, and adjusting the guide plate to be in a horizontal state by using the leveling member.
And 7: and hoisting the precast pile by using the hoisting device, and enabling the precast pile to penetrate through the open holes formed in the guide plate and the second support plate and sink into the drill hole.
Further, in the step 3, cement slurry is injected into the hole while drilling, and a mud film is formed on the wall of the drilled hole.
Further, in the step 6, a positioning instrument is used for positioning the set edge line, the set edge line and the drilled hole are coaxially arranged, a plurality of steel nails are inserted into the set edge line, the positioning beam is placed along the edge line formed by the steel nails, the pile splicing device is placed on the ground, the outer side face of the edge of the second supporting plate is in contact with the positioning beam, and positioning and fixing of the pile splicing device are completed.
Further, in the step 7, when the buoyancy of the cement grout injected into the drilled hole in the step 5 on the precast pile is larger than the gravity of the precast pile, the precast pile is vibrated and driven by the vibration hammer until the precast pile reaches the designed elevation position.
The invention has the beneficial effects that:
1. according to the large-size precast pile enclosure construction system, the drilling device adopts the existing rotary drilling rig, the rotary drilling rig is low in cost and large in quantity, the problem that the large-size precast pile enclosure construction mechanical equipment is few is solved, the construction mechanical equipment and operators can be increased, the working efficiency of enclosure construction is improved, and the construction progress of the enclosure is accelerated.
2. The large-size precast pile enclosure construction system is provided with the positioning device, the position of a drilled hole can be accurately positioned, the positioning device is provided with the laser ranging device, the depth and the verticality of the drilled hole can be measured after the drilling is finished, the drilled hole can be corrected in time conveniently, the problems of poor hole forming positioning, verticality and depth control precision of the rotary drilling rig are solved, and the rotary drilling rig can be applied to construction of the large-size precast pile enclosure.
3. The large-size precast pile enclosure construction system provided by the invention is provided with the pile splicing device, can play a role in guiding when the counter bore of the precast pile is placed, and ensures the installation verticality of the precast pile.
4. According to the construction method of the large-size precast pile enclosure construction system, the cement slurry is injected into the drill hole in advance before pile sinking, so that the cement slurry can be densely filled around the precast pile, the strength and the filling rate are high, and the safety can be ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic top view of a positioning apparatus according to embodiment 1 of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A of FIG. 1 in accordance with the present invention;
fig. 3 is a schematic top view of a pile splicing apparatus according to embodiment 1 of the present invention;
FIG. 4 is a schematic side view of a pile splicing apparatus according to example 1 of the present invention;
FIG. 5 is a schematic view of the method of step 1 of example 2 of the present invention;
fig. 6 is a schematic diagram of hoisting a precast pile in step 7 in embodiment 2 of the present invention;
the device comprises a first supporting plate 1, a first supporting leg 2, a first laser distance measuring device 3, a second laser distance measuring device 4, a mounting plate 5, an arc-shaped hole 6, a first bubble type level gauge 7, a second supporting plate 8, a second supporting leg 9, a screw rod 10, a second bubble type level gauge 11, a hole 12, a precast pile 13, a position finder 14, a first positioning point 15, a second positioning point 16, a crawler crane 17, a first lifting hook 18, a truck crane 19, a second lifting hook 20 and a drill hole 21.
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 application 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 application. As used herein, the singular forms "a", "an" and "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, unless the context clearly indicates otherwise.
For convenience of description, the words "up" and "down" in the present application, if any, are used merely to indicate correspondence with the directions of the upper and lower portions of the drawings, and are not intended to limit the structure, but merely to facilitate the description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or components so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
As introduced in the background art, in the construction of a large-size precast pile enclosure structure, a long spiral drilling machine or a double-power spiral down-the-hole hammer drilling machine is adopted for drilling at present, so that the equipment cost is high, the quantity is small, and a construction system is lacked on site.
In example 1 of an exemplary embodiment of the present application, as shown in fig. 1 to 4, a large-sized precast pile enclosure construction system includes a rotary drilling rig, a positioning device, a grouting device, a pile splicing device, and a hoisting device.
The rotary drilling rig is characterized in that the rotary drilling rig adopts the conventional rotary drilling rig and is used for drilling.
The positioning device comprises a ring-shaped first supporting plate 1, four first supporting legs 2 are arranged on the bottom surface of the edge of the first supporting plate, the four first supporting legs are uniformly distributed along the circumference of the first supporting plate, the tops of the four first supporting legs are in threaded connection with the first supporting plate, the four first supporting legs can rotate to level the first supporting plate, a circular mounting plate 5 is fixedly welded on the top surface of the read supporting plate, the mounting plate and the first supporting plate are coaxially arranged, a first mounting hole is formed in the center of the mounting plate, a first laser ranging device 3 is fixedly arranged in the first mounting hole and is used for corresponding to the center position of the precast pile, four second mounting holes are further formed in the mounting plate, the centers of the four second mounting holes are symmetrically arranged relative to the center of the first mounting hole and are positioned at four corners of a rectangle matched with the cross section of the precast pile, the second laser ranging device 4 is installed in the second installation hole and used for corresponding to the positions of four corners of the precast pile, the laser emitting end and the receiving end of the first laser ranging device and the second laser ranging device are both arranged downwards, laser rays emitted by the emitting end can penetrate through the first supporting plate to be emitted, reflected laser rays can penetrate through the first supporting plate to be received by the receiving end, the first laser ranging device and the second laser ranging device are the existing laser ranging devices, and the specific structures of the first laser ranging device and the second laser ranging device are not described in detail here.
Still be provided with a plurality of arc holes 6 on the first backup pad, the axis in a plurality of arc holes is located same circumference, and the circumference and the coaxial setting of first backup pad and mounting panel at arc hole axis place, constructor can spray paint in arc hole top, and the paint vehicle can pass the arc hole and spray to treating the bottom surface of drilling on, treats the position of drilling and carries out the sign, makes the drilling position more striking, conveniently carries out accurate location to the drilling position.
Still be provided with first bubble type spirit level 7 on the first backup pad for detect the levelness of first backup pad, make things convenient for constructor to carry out the leveling to first backup pad.
The grouting device comprises a grouting pipe, the grouting pipe can be connected with a grouting pump, and the grouting pump can drive cement slurry to be injected into the drilled hole through the grouting pipe.
The pile splicing device comprises a square second supporting plate 8, wherein second supporting legs 9 are fixed at four corners of the bottom surface of the second supporting plate and are used for being placed on the ground to support the second supporting plate.
The upper surface of second backup pad is connected with the deflector rather than coaxial setting through leveling, leveling sets up four angular position departments at the deflector lower surface, leveling includes screw rod 10, screw rod bottom and second backup pad threaded connection, the spacing groove that the deflector set up is stretched into on the top of screw rod, the diameter of spacing groove is greater than the diameter of screw rod, and the screw rod stretches into the spacing groove, can carry out spacingly to the relative position of deflector and second backup pad, guarantees the axiality of deflector and second backup pad, and the rotation of four screw rods simultaneously can carry out the leveling to the deflector.
And a second bubble type level gauge 11 is arranged on the guide plate and used for detecting the levelness of the guide plate, so that the guide plate can be leveled by constructors conveniently.
All be provided with the trompil 12 of square in deflector and the second backup pad, the size of the trompil on the deflector slightly is greater than the cross-section square size of precast pile 13, the size of trompil on the second backup pad slightly is greater than the size of trompil on the deflector, and the precast pile can pass deflector and second backup pad through the trompil and get into in the drilling, the deflector is used for leading the motion of precast pile, guarantees that the precast pile gets into the direction and the straightness that hangs down of drilling.
Hoisting accessory includes first loop wheel machine and second loop wheel machine, first loop wheel machine adopts the crawler crane of 150 tons, the second loop wheel machine adopts the mobile crane of 80 tons, the lifting part of first loop wheel machine can be connected with the top surface of precast pile through the first lifting hook of welding at precast pile top surface, the second loop wheel machine can be connected with the side of precast pile through the second lifting hook of welding at precast pile lateral surface, the second lifting hook setting is in distance precast pile top 2/3 total length position department.
Example 2:
the embodiment discloses a construction method using the large-size precast pile envelope construction system in embodiment 1, which includes the following steps:
step 1: as shown in fig. 5, second positioning points corresponding to the first positioning point in the center of the drilled hole and four corners of the precast pile are positioned.
Specifically, a locator 14 (a total station or a theodolite) is used for locating a first locating point 15 corresponding to the center of the drilled hole and second locating points 16 corresponding to four corners of the precast pile, identification is carried out, and identification steel nails can be arranged at the locating points or other methods can be adopted for identification.
Step 2: the positioning device is placed on the ground to be drilled through the first supporting leg, the first laser ranging device on the mounting plate is aligned to the first positioning point, four second laser ranging devices on the mounting plate are aligned to four second positioning points respectively, the first supporting leg is identified at the fixed position of the ground, an identification steel nail can be inserted into the ground soil body at the periphery of the first supporting leg for identification, other modes can be adopted for identification, the first supporting leg is rotated, the first supporting leg is leveled by observing the first bubble type level gauge and utilizing the first supporting leg, after leveling, the ground to be drilled is sprayed with paint through the arc-shaped hole, the paint vehicle penetrates through the arc-shaped hole, the identification on the same circumference is formed on the ground, and the identification of the drilling position is realized.
And step 3: the positioning device is moved away, the rotary drilling rig is moved to a set position, the teeth of the drill bit of the rotary drilling rig are aligned with the marks of the drilling position, the rotary drilling rig is used for vertically drilling until the drilling depth is set, cement slurry is injected into the drill bit during the drilling process of the rotary drilling rig, so that a layer of mud film is formed on the inner wall of the drill hole during the drilling process of the rotary drilling rig, the stability of the wall of the drill hole is kept, the drill hole is secondarily emptied by adopting a positive and negative slurry circulation method, and the sediment thickness of the hole is ensured to be not more than 30 cm.
And 4, step 4: utilize the sign of step 2 to first leg fixed position, place positioner subaerial once more, start first laser ranging device and second laser ranging device, the transmitting terminal of first laser ranging device and second laser ranging device sends the laser ray, the laser ray is received by the receiving terminal after the hole face reflection of drilling bottom, thereby survey the degree of depth of drilling, compare the verticality of drilling simultaneously with the vertical of first laser ranging sensor and second laser ranging sensor collection, obtain the straightness that hangs down of drilling, to the drilling that the degree of depth and the straightness that hangs down unsatisfied the requirement, utilize and dig the rig soon and revise, the degree of depth and the straightness that hangs down of drilling meet the requirement.
And 5: and one end of the grouting pipe is connected with a grouting pump, the other end of the grouting pipe extends into the bottom of the drill hole, the prepared cement slurry is injected into the drill hole 21 through the grouting pipe by the grouting pump, the grouting pipe is lifted upwards along with the rising of the cement slurry liquid level, the depth of the cement slurry embedded into the bottom of the grouting pipe is kept at 2-3 m, the grouting is stopped when the cement slurry liquid level reaches the position 0.5-1 m above the designed elevation of the pile top of the precast pile, and the grouting pipe is removed after the grouting is finished.
The density of the cement grout injected in the step 5 is higher than that of the cement grout injected in the step 3, so that the cement grout injected after the step 5 can completely eject the cement grout injected in the step 3, and a compact and complete filling body is formed around the precast pile.
Step 6: the pile splicing device is placed on the ground, a guide plate and a second support plate of the pile splicing device are coaxially arranged with a drill hole, the pile splicing device is placed before, a positioning instrument (a total station or a theodolite) is used for positioning a set square edge line, the square edge line and the drill hole are coaxially arranged, three steel nails are inserted into each line of the set square edge line, one side of the set square edge line is determined by the three steel nails, then the positioning beam is placed along the steel nails, the positioning beam can adopt channel steel, the pile splicing device is placed in a space formed by four channel steel, the outer side surface of the second support plate is in contact with the inner side surface of the channel steel, the pile splicing device is positioned by utilizing the channel steel, and after the pile splicing device is positioned, four screw rods are rotated, and the guide plate is leveled by observing a second bubble type level gauge.
And 7: and hoisting the precast pile by using the hoisting device, and enabling the precast pile to penetrate through the open holes formed in the guide plate and the second support plate and sink into the drill hole.
Specifically, as shown in fig. 6, a hoisting part of a crawler crane 17 is connected with a first lifting hook 18 welded on the top surface of a precast pile, a hoisting part of a truck crane 19 is connected with a second lifting hook 20 welded on the lateral periphery of the precast pile, the precast pile is hoisted by the crawler crane and the truck crane, after the precast pile is hoisted to a set height, the crawler crane drives the first lifting hook to continuously rise, the truck crane drives the second lifting hook to descend until the precast pile is 90 degrees, then the second lifting hook is separated from the hoisting part of the truck crane, the crawler crane drives the precast pile to move to a set position, the precast pile is hoisted to be right above a pile connecting device, the crawler crane drives the precast pile to descend, the precast pile passes through a guide plate and a second support plate through an opening under the action of gravity, and is sunk into a drill hole, when the buoyancy of cement slurry in the drill hole on the precast pile is greater than the gravity of the precast pile, the connection of the crawler crane, and connecting the hoisting part of the crawler crane with a vibration hammer, adjusting the vibration hammer to the position of the connector of the precast pile top, clamping the connector of the precast pile top by the vibration hammer, and sinking the pile to the designed elevation by the vibration hammer. The gaps between the drilled holes and the periphery of the precast pile are filled with cement slurry, so that the strength and the filling rate can be well guaranteed.
In this embodiment, first lifting hook and second lifting hook all adopt the preparation of HRB40032 reinforcing bar to form, the bobbing hammer adopts motor vibration hammer or hydraulic pressure bobbing hammer or electromagnetic vibration hammer or mechanical vibration hammer or air vibration hammer, can reliably be connected with the reservation joint on precast pile top to possess automatic lax function.
After the precast pile is sunk, the vibration hammer is loosened, lifted and separated, the positioning steel nails and the channel steel are removed, original soil is used for backfilling a drilling gap below the ground to the ground elevation above the pile top of the precast pile, and then the construction of the next precast pile is carried out by adopting the same method.
By adopting the construction equipment of the embodiment, the positioning device can be utilized to accurately position the drilling position, the positioning device is utilized to measure the depth and the verticality of the drilled hole, the unqualified drilled hole is corrected in time, the drilling quality is ensured, the rotary drilling rig can be applied to the construction of large-size precast piles, the problem that equipment is lack on site due to the fact that the number of the upper spiral drilling rigs or double-power plant spiral down-the-hole hammer drilling rigs is small is solved, construction mechanical equipment and operating personnel can be increased, the working efficiency of the building envelope construction is improved, and the construction progress of the building envelope is accelerated.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A large-size precast pile maintenance structure construction system is characterized by comprising:
a rotary drilling rig: the drilling machine is used for drilling;
a positioning device: the prefabricated pile drilling device comprises an annular first supporting plate, wherein a plurality of first supporting legs are in threaded connection with the edge position of the bottom surface of the first supporting plate, a mounting plate coaxial with the first supporting plate is fixed on the first supporting plate, a laser ranging device matched with the central point and the angular point position of a prefabricated pile is arranged on the mounting plate, a plurality of arc-shaped holes are further formed in the first supporting plate, the axes of the arc-shaped holes are located on the circumference coaxial with the first supporting plate, paint can be sprayed to the ground to be drilled through the arc-shaped holes, and the drilling positions are identified;
grouting device: for injecting grout into the borehole;
pile splicing device: the prefabricated pile supporting device comprises a second supporting plate, wherein a plurality of second supporting legs are fixed on the bottom surface of the second supporting plate, the second supporting plate is connected with a guide plate through a leveling part, the guide plate and the second supporting plate are coaxially arranged, and holes matched with the cross section of a prefabricated pile are formed in the center positions of the guide plate and the second supporting plate;
hoisting accessory: the method is used for hoisting the precast pile.
2. A large-sized precast pile maintenance structure construction system according to claim 1, wherein the first support plate is provided with a first bubble level gauge for indicating a levelness of the first support plate.
3. A large-sized precast pile maintenance structure construction system according to claim 1, wherein a second bubble type level is provided on the guide plate to display the levelness of the guide plate.
4. A large-sized precast pile maintenance structure construction system according to claim 1, wherein the leveling member comprises screws symmetrically arranged with respect to the center of the guide plate, the top ends of the screws extend into limiting grooves provided in the guide plate, the bottom ends of the screws are in threaded connection with the second support plate, the guide plate can be leveled by rotating the screws, and the limiting grooves can ensure the coaxiality of the guide plate and the second support plate.
5. A large-sized precast pile maintenance structure construction system according to claim 1, wherein the hoisting means comprises a first crane having a hoisting portion capable of being connected to a top surface of the precast pile and a second crane having a hoisting portion capable of being connected to a side surface of the precast pile.
6. A large scale precast pile maintenance structure construction system as recited in claim 1, wherein said grouting means comprises a grouting guide connected to a grouting pump capable of driving a cement slurry into the borehole through the grouting guide.
7. A construction method using the large-sized precast pile maintenance structure construction system according to any one of claims 1 to 6, comprising the steps of:
step 1: positioning a first positioning point in the center of a drilling hole and second positioning points corresponding to four corners of the precast pile;
step 2: placing a positioning device on the ground to be drilled, aligning a laser ranging device corresponding to the center point of the precast pile on a mounting plate with a first positioning point, aligning laser ranging devices corresponding to four corners of the precast pile on the mounting plate with a second positioning point, marking a fixed position of a first supporting leg on the ground, leveling the first supporting plate by using the first supporting leg, spraying paint on the ground to be drilled by using an arc-shaped hole, and marking the position of the drilled hole;
and step 3: moving away the positioning device, aligning the teeth of the drill bit of the rotary drilling rig with the marks of the drilling positions, and drilling by using the rotary drilling rig;
and 4, step 4: fixing the positioning device on the ground again by using the mark of the first support leg at the ground fixing position, measuring the depth and the verticality of the drilled hole by using the laser ranging device, and correcting the drilled hole with unqualified depth and verticality until the drilled hole meets the set requirement;
and 5: moving away the positioning device, and grouting into the drill hole by using a grouting device;
step 6: fixing the pile splicing device on the bottom surface, enabling the guide plate, the second support plate and the drill hole to be coaxially arranged, and adjusting the guide plate to be in a horizontal state by utilizing the leveling part;
and 7: and hoisting the precast pile by using the hoisting device, and enabling the precast pile to penetrate through the open holes formed in the guide plate and the second support plate and sink into the drill hole.
8. The method of claim 7, wherein in step 3, a cement slurry is injected into the hole while drilling the hole, thereby forming a mud film on the wall of the hole.
9. The construction method according to claim 7, wherein in the step 6, the set edge line is positioned by using a positioning tool, the set edge line is coaxially arranged with the drilled hole, a plurality of steel nails are inserted into the set edge line, the positioning beam is placed along the edge line formed by the plurality of steel nails, the pile splicing device is placed on the ground, and the outer side surface of the edge of the second supporting plate is contacted with the positioning beam, so that the positioning and fixing of the pile splicing device are completed.
10. The construction method as claimed in claim 7, wherein in the step 7, when the buoyancy of the cement grout injected into the drilled hole to the precast pile is greater than the gravity of the precast pile in the step 5, the precast pile is vibro-driven by the vibrohammer until the precast pile reaches the designed elevation position.
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