CN110735430A - single-row construction method for support-free precast support piles of foundation pit and middle-arranged inclined pile pressing machine - Google Patents
single-row construction method for support-free precast support piles of foundation pit and middle-arranged inclined pile pressing machine Download PDFInfo
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Abstract
The invention discloses a construction method for supporting single row of unsupported precast inclined piles of a foundation pit, which comprises the following steps of (1) arranging a central inclined pile press machine, (2) hoisting a support pile A1 by a crane assembly, placing and fixing the support pile A1 on a pile clamping device assembly, (3) setting the inclination angle of the support pile press machine, (4) carrying out amplitude variation on a keel frame assembly to a required angle by an amplitude variation oil cylinder, (4) carrying out static pressing on the support pile by the pile press oil cylinder, into a foundation, (5) completing a single stroke, loosening the pile clamping device assembly, repeating the pile pressing process, (6) driving to a preset depth, loosening the pile clamping device assembly, and moving a long ship assembly to a lower construction position by a complete machine, (7) hoisting the support pile A2 by the crane assembly, placing and fixing the support pile A2 on the pile clamping device assembly, (8) setting the pile press angle, pressing the A2 support pile into the foundation, forming a pile row, and (9) completing the machine position construction and moving to a lower machine position, and (10) repeating the steps (2) to (9).
Description
Technical Field
The invention relates to the technical field of hydraulic pile pressing machines, in particular to a single-row construction method of foundation pit support-free prefabricated support piles and a middle-arranged inclined pile pressing machine.
Background
The measures of soil retaining structure, underground water control, environmental protection and the like required for ensuring the safety and stability of the underground space formed by downward excavation of the ground during the construction of the underground structure are called foundation pit engineering. The foundation pit support is defined by the national industry standard of people's republic of China ' technical Specification for building foundation pit support ' JGJ120-2012 as follows: in order to protect the safety of the construction of the underground main body structure and the surrounding environment of the foundation pit, the foundation pit adopts the measures of temporary retaining, reinforcing, protecting and underground water controlling.
The foundation pit engineering is a systematic engineering integrating geological engineering, geotechnical engineering, structural engineering and geotechnical testing technologies into , and mainly comprises engineering investigation, supporting structure design and construction, earthwork excavation and backfilling, underground water control, informatization construction, peripheral environment protection and the like.
Whether a supporting structure is adopted for foundation pit excavation or not, which supporting structure is adopted, is determined by comprehensive analysis and comparison of economy, technology and environment according to the surrounding environment of the foundation pit, the condition of an underground structure, the excavation depth of the foundation pit, the engineering geological and hydrogeological conditions, the construction season, the regional engineering experience and the like.
The foundation pit supporting structure is composed of two parts, i.e. earth-retaining structure and dewatering and water-stopping system, the pile and wall supporting structure usually adopts steel sheet pile, reinforced concrete sheet pile, column type cast-in-place pile, underground continuous wall, etc. according to the soil condition and foundation pit scale, it can be designed into cantilever type, internal support type or anchor pull type.
In the prior art, the invention patent of China with the patent number of 201811411544.1 discloses a active inclined single-row pile foundation pit supporting method which comprises the following steps of 1) driving supporting piles inclined towards the inside of a pit along the inner side of the edge of a foundation pit to a designed elevation of a pile bottom to form a single-row supporting pile, and meanwhile arranging a waterproof curtain behind the single-row supporting pile, 2) arranging jacks at the top of each supporting pile, 3) arranging crown beams on the single-row supporting piles to connect all the supporting piles into a whole by using the crown beams, 4) excavating soil mass surrounded by the single-row supporting piles to the designed elevation of the pit bottom, and applying a control expansion force to the supporting piles by using the jacks arranged in the step 2) during or before excavation to reduce the displacement of the soil mass and the top displacement.
The construction method has the defects of fixed defects, a large number of supporting piles need to be constructed in a foundation pit construction site, the existing pile pressing construction equipment needs to be frequently moved, construction time is easily consumed for the construction process that the construction equipment is adopted to drive each supporting pile into the designed elevation of the pile bottom in the foundation pit construction site, the construction period is prolonged, the pile driving position and angle of each supporting pile are not high in control precision, a jack needs to be additionally arranged to control the displacement of a pile body, the monitoring difficulty is high, the displacement of a soil body and a pile top is easy to occur, the deviation of the supporting pile is caused, and the construction method is particularly not suitable for the construction of unsupported multistage supporting and crossed inclined pile arranging of the foundation pit of a large building with high continuity, high construction strength and short construction period.
Referring to the attached drawing 1, the Chinese patent application CN201711200885.X filed by the applicant of the present invention discloses variable-amplitude hydraulic pile pressing devices, which comprise pile pressing oil cylinders, a dragon frame and a pile clamping device, wherein cylinder barrels of the pile pressing oil cylinders are fixed on the dragon frame, the pile clamping device is internally provided with a radial telescopic pile clamping structure, two opposite side surfaces of the pile clamping device are respectively provided with a guide piece to be movably connected with a guide support at the inner side of the dragon frame, the bottom of the dragon frame is provided with a rotating base, the upper end of the rotating base is connected with the dragon frame through a pin shaft A or a bolting mode, the lower end of the rotating base is movably connected with a supporting platform through a pin shaft B to form a rotating structure, the supporting platform is provided with the variable-amplitude oil cylinder, the cylinder body of the variable-amplitude oil cylinder is fixedly connected with the supporting platform, a piston rod of the variable-amplitude oil cylinder is connected with the upper part of the dragon frame to form a variable-amplitude rotating structure driving the dragon frame to rotate around the pin shaft B, and the dragon frame rotates around the B to drive the.
In practical application, particularly in the process of multi-stage supporting construction operation of single-row piles and single-row piles, the applicant finds that the variable-amplitude hydraulic pile pressing device has the following defects:
1. the construction method comprises the steps of arranging a dragon frame and a pile clamping device at the front part of a supporting platform, limiting the space for arranging a cylinder body and a piston rod of a variable-amplitude oil cylinder on the supporting platform, only arranging -stage oil cylinders with the variable-amplitude range of +/-15 degrees and short stroke, and difficultly realizing inclination of a large inclination angle and a long stroke of 20 degrees or more, limiting the application range of the variable-amplitude oil cylinders, and only being suitable for pile pressing operation of a prefabricated support pile with a small variable-amplitude inclination angle and a short stroke, 2, because the dragon frame and the pile clamping device are arranged at the front part of the supporting platform (i.e. the side of facing a working surface and facing away from a crane), the whole gravity center of a pile pressing machine in a non-pile pressing working state is also at the front part of the supporting platform, the whole balance of the pile pressing machine or the pile pressing machine is not easily controlled in the process of moving or shifting, the whole balance of the pile pressing machine is influenced by the speed of the machine or shifting, 3, because the whole gravity center of the pile pressing machine is also at the front part of the supporting platform, the front part of the supporting platform in the working state, the supporting platform, the single pile pressing machine is not uniform in the front part of the supporting platform, the front part of the supporting platform is easily influenced by local pile pressing machine under the condition of the local pile pressing, the local pile pressing machine, the whole pile pressing machine, the stability, the integral pile pressing machine, the supporting platform, the integral pile pressing machine, the supporting platform, the integral pile pressing machine.
Disclosure of Invention
The invention aims to provide supporting single-row construction methods of foundation pit unsupported precast inclined piles and a middle-arranged inclined pile pressing machine, aiming at the construction characteristics of the pile row of the unsupported foundation pit, redesigning a frame assembly to increase the inclination angle and the stroke, performing pile pressing operation according to each group of supporting piles, and performing pile pressing operation according to each group of supporting piles without moving a machine, wherein after the pile pressing operation is performed on the machine position of a working face, the construction of groups of supporting piles can be completed only by performing moving operation and left-right movement on a long ship assembly on the machine position, the machine position moving operation amount is small, the shifting speed is high, the pile pressing efficiency on the unsupported pile row is high, the pile body positioning accuracy is high, the subsequent displacement and deformation of the pile body are small, the construction time and energy are saved, and the construction safety is improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
A single-row construction method for supporting unsupported precast inclined piles of foundation pits comprises the following steps:
(1) the central inclined pile press-driver is arranged on a foundation pit construction site, and the length direction of a supporting platform assembly of the machine is vertical to the operation surface, namely the arrangement direction of piles, and comprises a supporting platform assembly arranged in parallel with the axial lead of the length direction of the supporting platform assembly, a long ship assembly and a short ship assembly which are arranged in a crossed way with the axial lead of the length direction of the supporting platform assembly, wherein the supporting platform assembly is provided with a amplitude-variable type dragon frame assembly, the dragon frame assembly is arranged at the geometric center of the supporting platform assembly, the dragon frame assembly is provided with a pile press oil cylinder, and the pile press oil cylinder is also connected with a pile clamping assembly arranged on a dragon frame assembly, and the amplitude-variable type dragon frame assembly and the pile clamping assembly are lifted up within the range of +/-30 degrees and swing in the front-back direction vertical to the construction operation surface so as to adjust the pile press angles of inclined piles and vertical piles of the inclined piles in the supporting piles, each group of inclined single row piles comprises at least 2 fender piles, each group of inclined piles which are inclined piles 465A + 5A or inclined piles which are inclined piles or 4835A + 6A + 15A or inclined piles;
(2) enabling the pile pressing machine to reach the th machine position, starting a crane assembly arranged on a supporting platform assembly, hoisting a support pile A1 needing to be pressed into a foundation soil body by controlling the crane assembly, placing the support pile A1 into a pile gripper assembly of a dragon frame assembly, and clamping and fixing the support pile A1 through the pile gripper assembly on the dragon frame assembly;
(3) the dragon frame assembly sets the pile pressing angle of A1 support piles within the inclination angle range of +/-30 degrees and fixes the pile pressing angle, the pile pressing oil cylinder is started, the pile clamping device assembly connected with the pile pressing oil cylinder is driven to press piles downwards through the pile pressing oil cylinder, and the A1 support piles are pressed into the foundation soil body through static force;
(4) when the A1 support pile is driven to a preset depth, the pile gripper assembly is loosened, the fixed state between the pile gripper assembly and the A1 support pile is released, and the left-right direction movement and the displacement of the whole machine to the construction station position of the A2 support pile are realized through the extension and retraction of a hydraulic mechanism on a long ship assembly of the supporting platform assembly;
(5) starting a crane assembly arranged on the supporting platform assembly, hoisting a support pile A2 needing to be pressed into a foundation soil body by controlling the crane assembly, placing the support pile A2 into a pile gripper assembly of the dragon frame assembly, and clamping and fixing the support pile A2 by the pile gripper assembly on the dragon frame assembly;
(6) the pile pressing angle of the A2 support piles is set and fixed in the inclination angle range of +/-30 degrees by the dragon frame assembly, the pile pressing oil cylinder is started, the pile clamping device assembly connected with the pile pressing oil cylinder is driven to press piles downwards by the pile pressing oil cylinder, the A2 support piles are pressed into the foundation statically, and the pile pressing oil cylinder and the A1 support piles form row piles, and construction of groups of support piles is completed;
(7) after construction of machine position support piles is completed in sequence, the pile press realizes the forward and backward movement of the whole machine and the displacement to the lower machine position to complete the construction position of each set of support piles of the machine position through the extension and retraction of a hydraulic mechanism on a shot boat assembly of the support platform assembly;
(8) and (5) repeating the steps (2) to (7), and pressing each group of support piles into the foundation respectively to complete pile pressing construction of each group of support piles of the single-row construction of the support-free prefabricated support piles on the working surface of the whole foundation pit.
As a further improvement of the present invention at , the method further comprises the steps of:
(1a) each group of the support-free prefabricated inclined pile supporting single-row piles comprises 3 supporting piles, namely an outer inclined pile A1, a straight pile A2 and an inner inclined pile A3;
it also includes the following steps:
(5a) starting a crane assembly arranged on the supporting platform assembly, hoisting a support pile A3 needing to be pressed into a foundation soil body by controlling the crane assembly, placing the support pile A3 into a pile gripper assembly of a dragon frame assembly, and fixing a support pile A3 by the pile gripper assembly on the dragon frame assembly;
(6a) the pile pressing angle of the A3 support piles is set and fixed in the inclination angle range of +/-30 degrees in the dragon frame assembly, the pile pressing oil cylinders are started, the pile clamping device assemblies connected with the pile pressing oil cylinders are driven to press piles downwards, the A3 support piles are pressed into the foundation statically, and the pile pressing oil cylinders and the A1 and A2 support piles form row piles, and construction of groups of support piles is completed.
As a further improvement , the step (1) further comprises the following steps:
(11) the support platform assembly of the central inclined pile pressing machine is provided with a short ship assembly, and when the pressing machine needs to be integrally transferred to a lower working position, the front and back movement of the whole machine is realized through the extension and retraction of a hydraulic mechanism on the short ship assembly of the support platform assembly;
(12) the left and right movement of the whole machine is realized through the extension and retraction of a hydraulic mechanism on a long ship assembly of the supporting platform assembly, so that the construction operation of groups of supporting piles on the working position is completed;
(13) and (5) repeating the steps (11) and (12), continuously and integrally moving the pile press to a new working position, and performing construction operation of the lower groups of support piles until pile press construction operation of the whole row of support piles is completed.
As a further improvement of , the step (3) (6) further comprises the following steps:
(31) and (61) starting a dragon frame assembly, adjusting the inclination angle and the position of a dragon frame assembly through a rotating shaft and a luffing cylinder on a dragon frame assembly, so that the inclination angle and the position of a support pile are consistent with a preset support pile construction inclination angle and position , and the central inclined pile press can realize the pile pressing construction of the support pile with the upright support pile or inclined inwards and outwards through the angle adjustment of a central dragon frame assembly.
As an improvement of , the dragon frame assembly is also provided with an angle monitoring system which is electrically connected with a control processor of a middle-arranged inclined pile pressing machine, the angle monitoring system is started simultaneously when the middle-arranged inclined pile pressing machine is started, the angle monitoring system continuously monitors the pile pressing angle and the pile pressing path of a support pile, when the angle monitoring system monitors that the pile pressing angle or the pile pressing path of the support pile deviates, an audible and visual alarm signal is immediately sent out, when the deviation exceeds an angle deviation allowable range, the middle-arranged inclined pile pressing machine is immediately closed to stop pressing the pile and send an alarm signal to the control processor, the angle monitoring system stops sending the alarm signal to the control processor and simultaneously drives a luffing oil cylinder on the dragon frame assembly to adjust the dragon frame assembly to return to a preset pile pressing construction angle and construction path through the luffing oil cylinder on the dragon frame assembly, and when the angle monitoring system detects that the support pile returns to a preset pile pressing angle and pile pressing path, the luffing oil cylinder is restarted to monitor the state of the luffing pile.
A centrally-mounted inclined pile driver for implementing the method comprises a supporting platform assembly, a crane assembly and a centrally-mounted gantry frame assembly, wherein the length direction of the supporting platform assembly is vertical to the direction of the arrangement of piles, the supporting platform assembly comprises a long ship assembly and a short ship assembly which are arranged in a cross mode with the axial line in the length direction, a 0 luffing gantry frame assembly is arranged on the supporting platform assembly, the gantry frame assembly is arranged at the geometric center of the supporting platform assembly, a pile driving oil cylinder is arranged on the gantry frame assembly and is connected with a pile clamping device assembly arranged on the gantry frame assembly, the luffing gantry frame assembly and the pile clamping device assembly 5 are started up along the direction vertical to the construction working face within an inclination angle range of +/-30 degrees to swing back and forth so as to adjust the pile driving angles of inclined piles and straight piles in supporting piles, the gantry frame assembly is matched with the long ship assembly on the supporting platform assembly through a rotating shaft and the outer side of the gantry 366 luffing gantry assembly to finish construction of groups of supporting piles or short piles on the supporting platform assembly.
As an improvement of , the middle-arranged dragon frame assembly is provided with a pile pressing oil cylinder for static pile pressing, the pile pressing oil cylinder is connected with the top end of a pile clamping device assembly arranged on the dragon frame assembly through a piston rod and a pin shaft, the pile pressing oil cylinder comprises two main pressure oil cylinders and two auxiliary pressure oil cylinders, cylinder barrels of the main pressure oil cylinders and the auxiliary pressure oil cylinders are fixed at the upper end of the dragon frame assembly, and the auxiliary pressure oil cylinders form an auxiliary pressurization structure and are used in large tonnage.
As a further improvement of , the support platform assembly is further provided with a control processor, the dragon frame assembly is provided with an angle monitoring system, and the control processor is electrically connected with the angle monitoring system.
As a further improvement of , the pile pressing oil cylinder fixing seat matched with the pile pressing oil cylinder is arranged on the dragon frame assembly, and the pile pressing oil cylinder is arranged behind the pile pressing oil cylinder fixing seat and is connected with the pile clamping device assembly through a piston rod and a pin shaft.
As a further improvement of , the pile gripper assembly is provided with a radial telescopic pile gripper structure, two opposite side surfaces of the pile gripper assembly are respectively provided with a guide part, and the guide parts are movably connected with a guide support at the inner side of the dragon frame assembly.
Compared with the prior art have the advantages that:
1. the invention relates to a single-row construction method for supporting a non-support prefabricated inclined pile of a foundation pit and a central inclined pile pressing machine, which aims at the construction characteristics of the pile row of the non-support foundation pit, redesigns a dragon frame assembly, provides a complete set design method for inclined supporting piles, develops a central inclined pile pressing machine (inclined piles with the angle of +/-20 degrees can be constructed) of a static pile pressing device special for inclined piles with the angle of +/-30 degrees, is vertical to a working surface in the length direction of a support plane of the device, controls a long ship assembly to move left and right, controls a short ship assembly to move front and back, swings in the front and back directions, and can complete the construction of each group of supporting piles of the working position only by operating and moving the long ship assembly left and right after being deployed to the working position of the working surface.
2. The middle-arranged inclined pile pressing machine provided by the invention has the advantages that the dragon frame and the pile clamping device are arranged in the middle of the supporting platform, the space of the cylinder body of the amplitude-variable oil cylinder and the piston rod thereof arranged on the supporting platform is greatly expanded, the two-stage oil cylinder is arranged, the amplitude-variable range is expanded to +/-30 degrees, the stroke is synchronously increased, the inclination of a large inclination angle of +/-20 degrees or more and a long stroke can be realized, the application range of the pile pressing machine is expanded, and the pile pressing machine is suitable for pile pressing operation of a prefabricated support pile with a large amplitude-variable inclination angle and a long stroke.
3. Because the dragon frame and the pile gripper are arranged in the middle of the supporting platform (i.e. the geometrical center position facing away from the crane and facing the working surface), the gravity center of the whole pile press is positioned in the middle of the supporting platform under the non-pile-pressing working state, and the whole balance (balance of the whole machine under the dynamic state) is easily controlled in the process of moving or shifting, thereby accelerating the speed of moving or shifting and improving the safety of construction.
4. Because the whole gravity center of the pile pressing machine is also positioned in the middle of the supporting platform, the front part and the rear part of the supporting platform are uniformly stressed in the pile pressing working state, the phenomenon that the front part of the pile pressing machine sinks locally under heavy pressure, the whole stability of equipment and the pile driving precision are not influenced is avoided, and the construction safety is also improved.
5. In the process of multi-stage supporting construction operation such as vertical and inclined combined single-row supporting piles, inclined and inclined combined single-row supporting piles and the like under the condition of no supporting of a foundation pit, the direction design of a supporting platform and a dragon frame assembly is reasonable, the defects that the length of time consumption, the energy consumption and the construction speed are high and the construction efficiency and the cost are influenced because the operation of moving a machine is required to operate the next supporting piles after the pile pressing operation of each supporting pile is completed are overcome, the operation of pressing groups or multiple groups of supporting piles can be completed at each station and then the machine moving operation is required, and particularly in the large-scale engineering construction, the pile pressing operation of the multi-stage supporting piles is higher in construction efficiency and lower in cost.
6. According to the support-free prefabricated inclined pile support single-row construction method for the foundation pit and the central inclined pile pressing machine, through the central inclined pile pressing machine, single-row support pile construction in modes of vertical and inclined combined single-row support piles, inclined and inclined combined single-row support piles and the like can be realized, and horizontal support-free construction can be realized within a depth range of 5m-10 m; the method can be applied to earth excavation in the foundation pit without the horizontal support and construction of the underground structure of the building, can save the construction period of construction and dismantling without the horizontal support in the prior construction technology, and can obviously shorten the construction period.
7. According to the single-row construction method for the support-free prefabricated inclined pile support of the foundation pit and the central inclined pile pressing machine, the single-row construction of the support-free prefabricated inclined pile support of the foundation pit is carried out by adopting the prefabricated support piles, so that the industrialized construction by adopting the prefabricated support piles can be realized; underground pipe gallery can adopt prefabricated pipe gallery to assemble in the no horizontal support foundation ditch, realizes underground pipe gallery's industrialization and builds.
To more clearly illustrate the structural features and effects of the present invention, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic overall appearance structure diagram of a variable amplitude type hydraulic pile pressing device in the prior art;
FIG. 2 is a schematic construction view of kinds of single-row support piles;
FIG. 3 is a schematic construction view of a second single row of inclined piles;
FIG. 4 is a schematic construction view of a third single row of inclined piles;
FIG. 5 is a schematic view of the overall configuration of the built-in inclined pile driver according to the present invention;
FIG. 6 is a schematic top view of the structure of FIG. 5;
FIG. 7 is a schematic structural view of the assembly of FIG. 5;
fig. 8 is an assembly structure diagram of a part of the dragon rack assembly in fig. 5.
In the drawing, the pile pressing device comprises a supporting platform assembly 1, a short ship assembly 2, a dragon frame assembly 3, a pile pressing oil cylinder 4, a pile clamping device assembly 5, a crane assembly 6, a long ship assembly 7, a main oil cylinder 8, a main oil cylinder 9, an auxiliary oil cylinder 10, a pile pressing oil cylinder fixing seat, a supporting pile A1, an outer inclined pile A2, a straight pile A3, an inner inclined pile B, a foundation (soil mass), a foundation pit C, a pipe gallery D.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.
Example 1:
referring to the attached drawings 2-8, the construction method for supporting single row of unsupported precast inclined piles in engineering construction of city pipe gallery construction and the like provided by the embodiment specifically comprises the steps of excavating foundation pits C with the length of 2 kilometers and the depth of 8-10 meters on a soft foundation soil foundation B to lay a prefabricated city comprehensive pipe gallery D, constructing by adopting a supportless precast inclined pile supporting single row construction method, a built-in inclined pile pressing machine and a precast supporting cement pile, constructing each supportless precast inclined pile supporting single row pile of a part of construction section comprises 2 supporting piles A, namely external inclined piles A1+ straight piles A2 or second external inclined piles A1+ internal inclined piles A2, and each supportless precast inclined pile supporting single row of a part of construction section comprises 3 supporting piles A, and the third supporting pile is external inclined piles A1+ straight piles A2+ internal inclined piles A3.
The construction method of the single row of the support of the unsupported precast inclined pile of the foundation pit takes construction of the kinds of support piles as an example, and specifically comprises the following steps:
(1) the middle-mounted inclined pile press-driver is arranged on a foundation pit C construction site, the length direction of a supporting platform assembly 1 is vertical to the operation surface, namely the arrangement direction of piles, and the middle-mounted inclined pile press-driver comprises a supporting platform assembly 1 arranged in parallel with the length direction axis of the supporting platform assembly 1, a long ship assembly 7 and a short ship assembly 2 arranged in a cross mode with the length direction axis of the supporting platform assembly 1, wherein a amplitude type dragon frame assembly 3 is arranged on the supporting platform assembly 1, the dragon frame assembly 3 is arranged at the geometric center of the supporting platform assembly 1, a pile press cylinder 4 is arranged on the dragon frame assembly 3, the pile press cylinder 4 is also connected with a pile clamping assembly 5 arranged on the dragon frame assembly 3, the amplitude type dragon frame assembly 3 and the pile clamping assembly 5 swing in the front-back direction of the construction surface within the range of +/-30 degrees of inclination angles and vertical to adjust the pile press-angle of piles in the inclined supporting piles and the vertical piles, and the single supporting pile press-pile comprises at least 585A + 465 inclined piles of inclined piles or 38735A + 35A inclined piles of each group of inclined piles;
the inclination of the vertical piles is 0, the inclination towards the outside is denoted by + and the inclination towards the inside is denoted by-.
The range of inclination angles of ± 30 ° means: the maximum inclination angle inward and outward is 30 degrees vertically or based on the vertical pile.
(2) The pile pressing machine reaches the th machine position, a crane assembly 6 arranged on a supporting platform assembly 1 is started, a supporting pile A1 needing to be pressed into a foundation soil body B is hoisted and placed in a pile gripper assembly 5 of a dragon frame assembly 3 by controlling the crane assembly 6, and the supporting pile A1 is clamped and fixed by the pile gripper assembly 5 on the dragon frame assembly 3;
(3) the method comprises the following steps that a dragon frame assembly 3 is provided with a pile pressing angle of A1 support piles within an inclination angle range of +/-30 degrees and is fixed, in the embodiment, the inclination angle is +30 degrees, namely 30 degrees towards the outer side, a pile pressing oil cylinder 4 is started, a pile clamping device assembly 5 connected with the pile pressing oil cylinder 4 is driven to press piles downwards through the pile pressing oil cylinder 4, and A1 support piles are pressed into a foundation soil body through static force;
(4) when the A1 support pile is driven to a preset depth, the pile gripper assembly 5 is loosened, the fixed state between the pile gripper assembly 5 and the A1 support pile is released, and the left and right directions of the whole machine are moved and shifted to the construction station position of the A2 support pile through the extension and retraction of a hydraulic mechanism on the long ship assembly 7 of the supporting platform assembly 1;
(5) starting a crane assembly 6 arranged on the supporting platform assembly 1, hoisting a support pile A2 needing to be pressed into a foundation soil body by controlling the crane assembly 6, placing the support pile A2 into a pile gripper assembly 5 of a dragon frame assembly 3, and clamping and fixing a support pile A2 by the pile gripper assembly 5 on the dragon frame assembly 3;
(6) the construction method comprises the following steps that a dragon frame assembly 3 is provided with a pile pressing angle of A2 support piles within an inclination angle range of +/-30 degrees and is fixed (the inclination angle of a vertical pile is 0, the inclination angle value is plus or minus, and the inclination angle value is minus), a pile pressing oil cylinder 4 is started, a pile clamping device assembly 5 connected with the pile pressing oil cylinder 4 is driven by the pile pressing oil cylinder 4 to press the pile downwards, the A2 support piles are pressed into a foundation statically, and the pile pressing oil cylinder and the A1 support piles form a row pile, and construction of groups of support piles is completed;
(7) after construction of supporting piles of each group of the th machine position is completed in sequence, the pile press machine realizes the forward and backward movement of the whole machine and shifts to the lower machine position to complete the construction position of the supporting piles of each group of the machine position through the extension and retraction of a hydraulic mechanism on a shot boat assembly 2 of a supporting platform assembly 1;
(8) and (5) repeating the steps (2) to (7), and pressing each group of support piles into the foundation respectively to complete pile pressing construction of each group of support piles of the single-row construction of the support-free prefabricated support piles on the working surface of the whole foundation pit.
Referring to the above embodiment, in 1, when the second outer inclined pile a1+ inner inclined pile a2 is performed, only the inclination angle of each inclined pile needs to be correspondingly adjusted, and other steps are the same.
In the single-row construction method for supporting the unsupported precast inclined pile of the foundation pit in this embodiment, when the third supporting pile is constructed, referring to embodiment 1, the difference is that the method further includes the following steps:
(1a) each group of the support-free prefabricated inclined pile supporting single-row piles comprises 3 supporting piles, namely an outer inclined pile A1, a straight pile A2 and an inner inclined pile A3;
it also includes the following steps:
(5a) the left-right movement is realized through the extension of a hydraulic mechanism of a long ship assembly 7, the third support pile A3 is pressed into the position, a crane assembly 6 arranged on a supporting platform assembly 1 is started, a support pile A3 needing to be pressed into a foundation soil body is lifted by controlling the crane assembly 6 and placed in a pile clamping device assembly 5 of a dragon frame assembly 3, and the support pile A3 is fixed through the pile clamping device assembly 5 on the dragon frame assembly 3;
(6a) the method comprises the steps of setting a pile pressing angle of an A3 support pile in an inclination angle range of +/-30 degrees of a dragon frame assembly 3, fixing, starting a pile pressing oil cylinder 4, driving a pile clamping device assembly 5 connected with the pile pressing oil cylinder 4 to press the pile downwards, pressing an A3 support pile into a foundation statically, enabling the pile pressing oil cylinder to form a row pile with the A1 support piles and the A2 support piles, and completing construction of groups of support piles.
In the single-row construction method for the support of the unsupported precast inclined pile of the foundation pit in the embodiment, the step (1) further comprises the following steps:
(11) the supporting platform assembly 1 of the central inclined pile pressing machine is provided with a short ship assembly 2, and when the pressing machine needs to be integrally transferred to a lower working position, the front and back movement of the whole machine is realized through the extension and retraction of a hydraulic mechanism on the short ship assembly 2 of the supporting platform assembly 1;
(12) the left and right movement of the whole machine is realized through the extension and retraction of a hydraulic mechanism on a long ship assembly 7 of the supporting platform assembly 1, so that the construction operation of groups of supporting piles on the working position is completed;
(13) and (5) repeating the steps (11) and (12), continuously and integrally moving the pile press to a new working position, and performing construction operation of the lower groups of support piles until pile press construction operation of the whole row of support piles is completed.
In the single-row construction method for supporting the unsupported precast inclined pile of the foundation pit in this embodiment, the steps (3) and (6) further include the following steps:
(31) (61) start dragon frame assembly 3, through the rotation axis on the dragon frame assembly 3 and become width of cloth hydro-cylinder and adjust dragon frame assembly 3's inclination angle and position altogether for the inclination angle and the position of a fender pile and the fender pile construction inclination angle of presetting and position accord with , make this central inclined pile press machine can realize the vertical or the pressure pile construction of the fender pile that inclines to the inside and outside of a fender pile through the angle modulation of central dragon frame assembly 3.
The construction method comprises the steps that an angle monitoring system is further arranged on a dragon frame assembly 3, the angle monitoring system is electrically connected with a control processor of a middle-arranged inclined pile pressing machine, the angle monitoring system is started simultaneously when the middle-arranged inclined pile pressing machine is started, the angle monitoring system conducts uninterrupted monitoring on the pile pressing angle and the pile pressing path of a support pile, when the angle monitoring system monitors that the pile pressing angle or the pile pressing path of the support pile deviates, an acousto-optic alarm signal and other alarm signals are sent out immediately, when the deviation of the angle deviation tolerance range is exceeded, the middle-arranged inclined pile pressing machine is closed immediately to stop pile pressing, the alarm signal is sent to the control processor, meanwhile, an amplitude-variable oil cylinder on a dragon frame assembly 3 is driven by the control processor to adjust a dragon frame assembly 3 to return to a preset pile pressing construction angle and a construction path, when the angle monitoring system detects that the support pile returns to the preset pile pressing angle and pile pressing path again, the amplitude-variable oil cylinder on the control processor starts again, and the hydraulic monitoring system conducts amplitude-variable-amplitude monitoring on the hydraulic pile pressing state.
A centrally-mounted inclined pile driver for implementing the method comprises a supporting platform assembly 1, a crane assembly 6 and a centrally-mounted gantry assembly frame assembly 3, wherein the crane assembly 6 and the centrally-mounted gantry assembly 3 are arranged on the supporting platform assembly 1, the length direction of the supporting platform assembly 1 is perpendicular to the direction of the arrangement of piles, the supporting platform assembly 1 comprises a long ship assembly 7 and a short ship assembly 2, the long ship assembly 7 and the short ship assembly 2 are arranged in a cross mode with the axial line in the length direction, a 0 luffing gantry assembly is arranged on the supporting platform assembly 1, the gantry assembly is arranged at the geometric center of the supporting platform assembly, a pile driving cylinder 4 is arranged on the gantry assembly , the pile driving cylinder is further connected with a pile clamping assembly 5 arranged on the gantry assembly 3, the luffing gantry assembly and the pile clamping assembly 5 swing back and forth in the inclination angle range of +/-30 degrees in the direction perpendicular to the construction working face to adjust the pressing angle of inclined piles and straight piles in the supporting piles , the gantry assembly cooperates with a plurality of groups of supporting platform assemblies 3876 and short ship assemblies through the rotating shaft assemblies 3872 of supporting platforms which are arranged on the supporting platform assembly 3 and the luffing ship assemblies 3872 to complete the construction working face.
In the central inclined pile pressing machine in the embodiment, a pile pressing oil cylinder 4 for static pile pressing is arranged on a central dragon frame assembly 3, the pile pressing oil cylinder 4 is connected with the top end of a pile clamping device assembly 5 arranged on a dragon frame assembly 3 through a piston rod and a pin shaft, the pile pressing oil cylinder 4 comprises two main pressure oil cylinders 8 and two auxiliary pressure oil cylinders 9, cylinder barrels of the main pressure oil cylinders 8 and the auxiliary pressure oil cylinders 9 are fixed at the upper end of the dragon frame assembly 3, and the auxiliary pressure oil cylinders 9 form an auxiliary pressure increasing structure so as to be used in large tonnage.
In the central inclined pile driver in this embodiment, the support platform assembly 1 is further provided with a control processor, the dragon frame assembly 3 is provided with an angle monitoring system, and the control processor and the angle monitoring system are electrically connected with each other.
In the central inclined pile pressing machine in this embodiment, a pile pressing oil cylinder fixing seat 10 matched with the pile pressing oil cylinder 4 is arranged on the dragon frame assembly 3, and the pile pressing oil cylinder 10 is arranged behind the pile pressing oil cylinder fixing seat 10 and is connected with the pile gripper assembly 5 through a piston rod and a pin shaft.
In the central inclined pile pressing machine in this embodiment, the pile gripper assembly 5 is provided with a radial telescopic pile gripper structure, two opposite side surfaces of the pile gripper assembly 5 are respectively provided with a guide member, and the guide members are movably connected with the guide supports on the inner side of the dragon frame assembly 3.
The single-row construction method for supporting the unsupported precast inclined pile of the foundation pit and the central inclined pile pressing machine in the embodiment have the design key points that:
1. according to the construction characteristics of the unsupported foundation pit row pile, the redesign of the dragon frame assembly is carried out, a complete design method of the inclined support pile is provided, a middle-arranged inclined pile press machine of static pile press equipment special for constructing +/-30-degree inclined piles (the inclined piles of +/-20 degrees can be constructed in the prior art) is developed, the length direction of a support plate of the equipment is perpendicular to the working face, the long ship assembly is controlled to move left and right, the short ship assembly is controlled to move front and back and a pile clamping device swings front and back, after the equipment is deployed to the working position of the working face, the long ship assembly is operated and moved left and right, the construction of each group of support piles of the working position can be completed, the shifting and moving speed is high, the pile driving efficiency is high, and the precision is high.
2. In the central inclined pile pressing machine in the embodiment, the dragon frame and the pile clamping device are arranged in the middle of the supporting platform, the space of the cylinder body of the variable-amplitude oil cylinder and the piston rod of the variable-amplitude oil cylinder arranged on the supporting platform is greatly expanded, the two-stage oil cylinder is arranged, the variable-amplitude range of the variable-amplitude oil cylinder is expanded to +/-30 degrees, the stroke is synchronously increased, the large inclination angle and the long stroke inclination of +/-20 degrees or more can be realized, the application range of the variable-amplitude inclined pile pressing machine is expanded, and the variable-amplitude inclined pile pressing machine is suitable for pile pressing operation of prefabricated support piles with.
3. In the single-row construction method for supporting the unsupported precast inclined pile of the foundation pit and the central inclined pile pressing machine in the embodiment, because the dragon frame and the pile clamping device are arranged in the middle of the supporting platform (i.e. the geometrical center position facing away from the crane and facing the working surface), the integral gravity center of the pile pressing machine in the non-pile pressing working state is positioned in the middle of the supporting platform, and the integral balance (balance of the whole machine in a dynamic state) is easily controlled in the machine moving or shifting process, so that the speed of machine moving or shifting is accelerated, and the construction safety is improved.
4. In the single-row construction method for supporting the unsupported precast inclined pile of the foundation pit and the central inclined pile pressing machine in the embodiment, because the center of gravity of the whole pressing machine is also positioned in the middle of the supporting platform, the front part and the rear part of the supporting platform are uniformly stressed in the pile pressing working state, the front part of the supporting platform is prevented from locally sinking under heavy pressure, the integral stability and the pile driving precision of equipment cannot be influenced, and the construction safety is also improved.
5. In the single-row construction method for supporting a foundation pit unsupported precast inclined pile and the central inclined pile pressing machine in the embodiment, in the process of carrying out multi-stage supporting construction operation such as vertical and inclined combined single-row supporting piles, inclined and inclined combined single-row supporting piles and the like under the condition of no supporting of the foundation pit, the direction design of a supporting platform and a dragon frame assembly is reasonable, the defects that the time consumption is long, the energy consumption is high, the construction speed is low, the precision of the inclined angle and the position for pressing in a pile body is low and the construction efficiency and the cost are influenced when the operation of pressing a pile of each supporting pile is completed and then the operation of pressing a group or a plurality of groups of supporting piles is required are overcome, and particularly in the large-scale engineering construction, the construction efficiency is higher and the cost is lower when the operation of pressing a plurality of stages of supporting piles is carried out.
6. In the foundation pit support-free prefabricated inclined pile support single-row construction method and the central inclined pile pressing machine in the embodiment, through the central inclined pile pressing machine, single-row support pile construction in modes of vertical and inclined combined single-row support piles, inclined and inclined combined single-row support piles and the like can be realized, and horizontal support-free construction can be realized within a depth range of 5m-10 m; the method can be applied to earth excavation in the foundation pit without the horizontal support and construction of the underground structure of the building, can save the construction period of construction and dismantling without the horizontal support in the prior construction technology, and can obviously shorten the construction period.
7. In the single-row construction method for supporting the unsupported precast inclined piles of the foundation pit and the central inclined pile pressing machine in the embodiment, the single-row construction of supporting the unsupported precast inclined piles of the foundation pit is carried out by adopting the precast support piles, so that the industrialized construction by adopting the precast support piles can be realized; underground pipe gallery can adopt prefabricated pipe gallery to assemble in the no horizontal support foundation ditch, realizes underground pipe gallery's industrialization and builds.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (10)
1, kinds of foundation ditch unsupported precast inclined pile support single-row construction method, characterized by comprising the following steps:
(1) the central inclined pile press-driver is arranged on a foundation pit construction site, and the length direction of a supporting platform assembly of the machine is vertical to the operation surface, namely the arrangement direction of piles, and comprises a supporting platform assembly arranged in parallel with the axial lead of the length direction of the supporting platform assembly, a long ship assembly and a short ship assembly which are arranged in a crossed way with the axial lead of the length direction of the supporting platform assembly, wherein the supporting platform assembly is provided with a amplitude-variable type dragon frame assembly, the dragon frame assembly is arranged at the geometric center of the supporting platform assembly, the dragon frame assembly is provided with a pile press oil cylinder, and the pile press oil cylinder is also connected with a pile clamping assembly arranged on a dragon frame assembly, and the amplitude-variable type dragon frame assembly and the pile clamping assembly are lifted up within the range of +/-30 degrees and swing in the front-back direction vertical to the construction operation surface so as to adjust the pile press angles of inclined piles and vertical piles of the inclined piles in the supporting piles, each group of inclined single row piles comprises at least 2 fender piles, each group of inclined piles which are inclined piles 465A + 5A or inclined piles which are inclined piles or 4835A + 6A + 15A or inclined piles;
(2) enabling the pile pressing machine to reach the th machine position, starting a crane assembly arranged on a supporting platform assembly, hoisting a support pile A1 needing to be pressed into a foundation soil body by controlling the crane assembly, placing the support pile A1 into a pile gripper assembly of a dragon frame assembly, and clamping and fixing the support pile A1 through the pile gripper assembly on the dragon frame assembly;
(3) the dragon frame assembly sets the pile pressing angle of A1 support piles within the inclination angle range of +/-30 degrees and fixes the pile pressing angle, the pile pressing oil cylinder is started, the pile clamping device assembly connected with the pile pressing oil cylinder is driven to press piles downwards through the pile pressing oil cylinder, and the A1 support piles are pressed into the foundation soil body through static force;
(4) when the A1 support pile is driven to a preset depth, the pile gripper assembly is loosened, the fixed state between the pile gripper assembly and the A1 support pile is released, and the left-right direction movement and the displacement of the whole machine to the construction station position of the A2 support pile are realized through the extension and retraction of a hydraulic mechanism on a long ship assembly of the supporting platform assembly;
(5) starting a crane assembly arranged on the supporting platform assembly, hoisting a support pile A2 needing to be pressed into a foundation soil body by controlling the crane assembly, placing the support pile A2 into a pile gripper assembly of the dragon frame assembly, and clamping and fixing the support pile A2 by the pile gripper assembly on the dragon frame assembly;
(6) the pile pressing angle of the A2 support piles is set and fixed in the inclination angle range of +/-30 degrees by the dragon frame assembly, the pile pressing oil cylinder is started, the pile clamping device assembly connected with the pile pressing oil cylinder is driven to press piles downwards by the pile pressing oil cylinder, the A2 support piles are pressed into the foundation statically, and the pile pressing oil cylinder and the A1 support piles form row piles, and construction of groups of support piles is completed;
(7) after construction of machine position support piles is completed in sequence, the pile press realizes the forward and backward movement of the whole machine and the displacement to the lower machine position to complete the construction position of each set of support piles of the machine position through the extension and retraction of a hydraulic mechanism on a shot boat assembly of the support platform assembly;
(8) and (5) repeating the steps (2) to (7), and pressing each group of support piles into the foundation respectively to complete pile pressing construction of each group of support piles of the single-row construction of the support-free prefabricated support piles on the working surface of the whole foundation pit.
2. The single-row construction method for the unsupported precast inclined pile support of the foundation pit according to claim 1, characterized by further comprising the following steps:
(1a) each group of the support-free prefabricated inclined pile supporting single-row piles comprises 3 supporting piles, namely an outer inclined pile A1, a straight pile A2 and an inner inclined pile A3;
it also includes the following steps:
(5a) starting a crane assembly arranged on the supporting platform assembly, hoisting a support pile A3 needing to be pressed into a foundation soil body by controlling the crane assembly, placing the support pile A3 into a pile gripper assembly of a dragon frame assembly, and fixing a support pile A3 by the pile gripper assembly on the dragon frame assembly;
(6a) the pile pressing angle of the A3 support piles is set and fixed in the inclination angle range of +/-30 degrees in the dragon frame assembly, the pile pressing oil cylinders are started, the pile clamping device assemblies connected with the pile pressing oil cylinders are driven to press piles downwards, the A3 support piles are pressed into the foundation statically, and the pile pressing oil cylinders and the A1 and A2 support piles form row piles, and construction of groups of support piles is completed.
3. The single-row construction method for the support of the unsupported precast inclined pile of the foundation pit according to claim 1 or 2, characterized by comprising the following steps:
the step (1) further comprises the following steps:
(11) the support platform assembly of the central inclined pile pressing machine is provided with a short ship assembly, and when the pressing machine needs to be integrally transferred to a lower working position, the front and back movement of the whole machine is realized through the extension and retraction of a hydraulic mechanism on the short ship assembly of the support platform assembly;
(12) the left and right movement of the whole machine is realized through the extension and retraction of a hydraulic mechanism on a long ship assembly of the supporting platform assembly, so that the construction operation of groups of supporting piles on the working position is completed;
(13) and (5) repeating the steps (11) and (12), continuously and integrally moving the pile press to a new working position, and performing construction operation of the lower groups of support piles until pile press construction operation of the whole row of support piles is completed.
4. The construction method for supporting a single row of the precast inclined piles without the supports of the foundation pit according to claim 1 or 2, wherein the step (3) (6) further comprises the following steps:
(31) and (61) starting a dragon frame assembly, adjusting the inclination angle and the position of a dragon frame assembly through a rotating shaft and a luffing cylinder on a dragon frame assembly, so that the inclination angle and the position of a support pile are consistent with a preset support pile construction inclination angle and position , and the central inclined pile press can realize the pile pressing construction of the support pile with the upright support pile or inclined inwards and outwards through the angle adjustment of a central dragon frame assembly.
5. The method for single row construction of supporting and protecting the precast inclined piles without the support of the foundation pit according to any in claim 1 or 2, wherein an angle monitoring system is further provided on the longs frame assembly, the angle monitoring system is electrically connected with a control processor of the central inclined pile pressing machine, the angle monitoring system is started simultaneously when the central inclined pile pressing machine is started, the angle monitoring system continuously monitors the pile pressing angle and the pile pressing path of the supporting pile, when the angle monitoring system monitors that the pile pressing angle or the pile pressing path of the supporting pile deviates, an alarm signal such as sound and light is immediately sent out, when the deviation tolerance range of the angle deviation is exceeded, the central inclined pile pressing machine is immediately closed to stop the pile pressing and send out the alarm signal to the control processor, the angle monitoring system stops sending the alarm signal to the control processor and simultaneously drives the luffing cylinder on the longs frame assembly to adjust the longs frame assembly to return the preset pile pressing angle and construction path, and when the angle monitoring system detects that the supporting pile returns to the preset pile pressing angle and pile pressing path, the luffing cylinder is stopped and the hydraulic pressure monitoring system returns to the preset pile state.
6, A central inclined pile driver for implementing the method as claimed in any one of claims 1 to 5 and , comprising a support platform assembly, a crane assembly and a central boom assembly, wherein the support platform assembly has a length direction perpendicular to the direction of pile row arrangement, the support platform assembly comprises a long ship assembly and a short ship assembly which are arranged crosswise to the axial line of the length direction, the support platform assembly is provided with a luffing jib assembly, the boom assembly is arranged at the geometric center of the support platform assembly, the boom assembly is provided with a pile driving cylinder and is connected with a pile gripper assembly arranged on the boom assembly, the luffing jib assembly and the pile gripper assembly are lifted up and swung back within an inclination angle range of +/-30 degrees in the direction perpendicular to the construction working surface to adjust the angle of inclined pile and straight pile driving, the boom 584 and the boom guard assembly are matched with a plurality of boom guard assemblies on the support platform assembly or a rotating shaft of the boom guard assembly to complete the operation of the long ship assembly or the boom guard assembly through the luffing jib assembly assembly and the boom guard assembly.
7. The central inclined pile driver as claimed in claim 6, wherein said central dragon frame assembly is provided with a pile pressing cylinder for static pile pressing, said pile pressing cylinder is connected with the top end of the pile gripper assembly arranged on the dragon frame assembly through a piston rod and a pin shaft, said pile pressing cylinder comprises two main pressure cylinders and two auxiliary pressure cylinders, the cylinder barrels of said main pressure cylinder and said auxiliary pressure cylinder are fixed on the upper end of the dragon frame assembly, and said auxiliary pressure cylinder forms an auxiliary pressurizing structure for large tonnage.
8. The central oblique pile driver as claimed in claim 6, wherein the supporting platform assembly further comprises a control processor, the dragon frame assembly comprises an angle monitoring system, and the control processor and the angle monitoring system are electrically connected with each other.
9. The central inclined pile driver according to claim 8, wherein a pile pressing cylinder fixing seat matched with the pile pressing cylinder is arranged on the dragon frame assembly, and the pile pressing cylinder is arranged behind the pile pressing cylinder fixing seat and connected with the pile gripper assembly through a piston rod and a pin shaft.
10. The central inclined pile driver as claimed in claim 6, wherein the pile gripper assembly is provided with a radially telescopic pile gripper structure, and two opposite sides of the pile gripper assembly are respectively provided with a guide member movably connected with the guide support inside the dragon frame assembly.
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