CN111675112A

CN111675112A - Height-adjustable bridge pier hoisting machine, construction method and overpass method

Info

Publication number: CN111675112A
Application number: CN202010571913.4A
Authority: CN
Inventors: 原贞华; 伍俊民; 胡旭东; 李珍西; 王朋; 朱兵; 陈忱
Original assignee: China Railway Engineering Machinery Research and Design Institute Co Ltd
Current assignee: China Railway Engineering Machinery Research and Design Institute Co Ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2020-09-18

Abstract

The invention provides a height-adjustable bridge pier hoisting machine, a construction method and an overpass method, wherein the height-adjustable bridge pier hoisting machine comprises: a frame beam assembly including a cross beam; the hoisting mechanism is arranged on the frame beam assembly and used for hoisting the prefabricated bridge pier to be assembled; a leg assembly for supporting the frame beam assembly; the landing leg assembly comprises a splitting part and a landing leg part, the upper end of the splitting part is connected with the cross beam and penetrates through the end part of the cross beam, the lower end of the splitting part is detachably connected with the landing leg part, and the cross beam is suitable for moving on the splitting part and the landing leg part. According to the invention, the landing leg assembly with the detaching part and the landing leg part is arranged, so that the height of the hoisting machine can be adjusted, and the convenience of transportation of the hoisting machine through limited-height terrains such as bridge opening of the overpass is improved.

Description

Height-adjustable bridge pier hoisting machine, construction method and overpass method

Technical Field

The invention relates to the technical field of prefabricated pier installation equipment, in particular to a height-adjustable pier hoisting machine, a construction method and an overpass method.

Background

At present, the height of a hoisting machine for hoisting a pier is generally higher and is highly fixed, when the hoisting machine meets an overpass in the transportation process, the hoisting machine needs to be disassembled and transported through a special tool, and the transportation cost and the transportation difficulty of the hoisting machine are greatly increased.

Disclosure of Invention

The invention solves the problems that: how to promote the convenience of transportation when pier hoisting machine passes through limit for height topography such as the bridge opening of overline bridge.

In order to solve the above problems, the present invention provides a pier hoisting machine with an adjustable height, comprising:

a frame beam assembly including a cross beam;

the hoisting mechanism is arranged on the frame beam assembly and used for hoisting the prefabricated bridge pier to be assembled;

a leg assembly for supporting the frame beam assembly;

the landing leg assembly comprises a splitting part and a landing leg part, the upper end of the splitting part is connected with the cross beam and penetrates through the end part of the cross beam, the lower end of the splitting part is detachably connected with the landing leg part, and the cross beam is suitable for moving on the splitting part and the landing leg part.

Optionally, the splitting part includes a plurality of segments, and the segments are sequentially arranged from top to bottom and detachably connected to each other.

Optionally, the pier hoisting machine with the adjustable height further comprises a climbing mechanism, one end of the climbing mechanism is arranged at the end of the cross beam, the other end of the climbing mechanism is sleeved on the landing leg assembly, and the end of the cross beam is connected with the landing leg assembly in a sliding mode through the climbing mechanism.

Optionally, the climbing mechanism includes a positioning seat and a telescopic rod, the positioning seat is sleeved on the leg assembly and is slidably connected with the leg assembly, one end of the telescopic rod is fixed on the positioning seat, and the other end of the telescopic rod is fixed on the cross beam.

Optionally, the splitting part and the leg part are respectively provided with a positioning hole, and the positioning seat is detachably connected with the splitting part or the leg part through a locking structure at the positioning hole.

Optionally, two cross beams are provided, and the two ends of each cross beam are provided with the supporting leg assemblies; the frame beam assembly further comprises a main beam, wherein the main beam is arranged between the two cross beams, and the two ends of the main beam are respectively connected with the two cross beams.

Optionally, the height-adjustable bridge pier hoisting machine further comprises a traveling mechanism, the traveling mechanism comprises a frame and a wheel set, and the frame is used for connecting the wheel set and the leg portion; the running gear is adapted to rotate relative to the leg portion.

Optionally, the running mechanism further comprises an expansion piece arranged at one end of the frame far away from the leg portion, one end of the expansion piece is fixed on the frame, and the other end of the expansion piece is suitable for being supported on the ground or separated from the ground.

Optionally, the wheel set comprises a plurality of running wheels, and the telescopic member is located between the plurality of running wheels.

Optionally, the hoisting mechanism comprises a winch, a trolley, a lifting appliance and a transverse oil cylinder, the winch is arranged on the cross beam, the trolley is arranged on the main beam, and the lifting appliance is located below the trolley and is suitable for being connected with the precast pier to be assembled; one end of the transverse oil cylinder is fixed on the main beam, the other end of the transverse oil cylinder is fixed on the trolley, and the trolley is suitable for moving along the length direction of the main beam through the transverse oil cylinder on the main beam.

In order to solve the above problems, the present invention further provides a construction method for erecting a prefabricated pier, wherein the height-adjustable pier hoisting machine comprises:

step 1, a transport vehicle transports a pier column to enter the position below the height-adjustable pier hoisting machine, the height-adjustable pier hoisting machine hoists the pier column, and the pier column is vertically installed on a pier to be hoisted;

step 2, the transport vehicle transports the pier capping beam to enter the position below the height-adjustable pier hoisting machine, the height-adjustable pier hoisting machine hoists the pier capping beam and moves the pier capping beam to the position above the pier upright column so as to assemble the pier capping beam and the pier upright column;

step 3, the transport vehicle transports the pier end beam to enter the position below the height-adjustable pier hoisting machine, the height-adjustable pier hoisting machine hoists the pier end beam and moves the pier end beam to the end part of the pier cover beam so as to assemble the pier end beam and the pier cover beam;

and 4, repeating the step 3 to complete the assembly of the other pier end beam.

In order to solve the above problems, the present invention further provides an overpass method of a height-adjustable pier hoisting machine, which adopts the height-adjustable pier hoisting machine, comprising:

step a, a frame beam assembly of the height-adjustable bridge pier hoisting machine falls down, a split part of a landing leg assembly of the height-adjustable bridge pier hoisting machine is disassembled, the split part is installed on a transport vehicle to serve as a bracket, and the transport vehicle runs to the position below the height-adjustable bridge pier hoisting machine;

b, the frame beam assembly falls down onto the bracket;

and c, jacking the frame beam assembly until the leg part of the leg assembly leaves the ground by the transport vehicle, and transporting the height-adjustable bridge pier hoisting machine by the transport vehicle through a bridge opening of the overpass.

Compared with the prior art, the invention has the following beneficial effects: the height of the landing leg assembly can be adjusted by arranging the detaching part and the landing leg part, so that the height of the hoisting machine can be adjusted, the hoisting machine can conveniently pass through height-limited terrains such as a bridge opening of an overpass by reducing the height, the transportation convenience of the hoisting machine passing through the height-limited terrains such as the bridge opening of the overpass is greatly improved, the hoisting machine is suitable for hoisting prefabricated piers to be spliced with different height specifications, and the application range of the hoisting machine is enlarged; in addition, the hoisting machine can be used as special equipment for assembling the prefabricated bridge pier, and compared with the prior art that the prefabricated bridge pier is assembled by adopting a crawler crane or a truck crane, the hoisting machine in the embodiment does not need to be arranged in advance, and preparation work such as adding a counterweight is not needed, so that the assembling construction efficiency of the prefabricated bridge pier is improved, and the construction time is saved.

Drawings

FIG. 1 is a schematic structural view of a height-adjustable bridge pier hoisting machine in an embodiment of the invention;

FIG. 2 is a schematic structural view of another view angle of the height-adjustable bridge pier hoisting machine in the embodiment of the invention;

FIG. 3 is a schematic structural view of another view angle of the height-adjustable bridge pier hoisting machine in the embodiment of the invention;

FIG. 4 is a schematic structural view of another view angle of the height-adjustable bridge pier hoisting machine in the embodiment of the invention;

fig. 5(a) and 5(b) are schematic views of a state corresponding to step 1.1 in the construction method for erecting a prefabricated pier according to the embodiment of the invention;

fig. 6(a) and 6(b) are schematic views of another state corresponding to step 1.1 in the construction method for erecting a prefabricated pier according to the embodiment of the invention;

fig. 7(a) and 7(b) are schematic views of another state corresponding to step 1.1 in the construction method for erecting a prefabricated pier according to the embodiment of the invention;

fig. 8(a) and 8(b) are schematic views illustrating a state corresponding to step 1.2 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 9(a) and 9(b) are schematic views of another state corresponding to step 1.2 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 10(a) and 10(b) are schematic views illustrating a state corresponding to step 2.1 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 11(a) and 11(b) are schematic views of another state corresponding to step 2.1 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 12(a) and 12(b) are schematic views of another state corresponding to step 2.1 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 13(a) and 13(b) are schematic views illustrating still another state corresponding to step 2.1 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 14(a) and 14(b) are schematic views illustrating a state corresponding to step 2.2 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 15(a) and 15(b) are schematic views illustrating a state corresponding to step 3.1 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 16(a) and 16(b) are schematic views of another state corresponding to step 3.1 in the construction method for erecting a prefabricated pier according to the embodiment of the invention;

fig. 17(a) and 17(b) are schematic views illustrating still another state corresponding to step 3.1 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 18(a) and 18(b) are schematic views illustrating still another state corresponding to step 3.1 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 19(a) and 19(b) are schematic views showing a state corresponding to step 3.2 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 20(a) and 20(b) are schematic views illustrating a state corresponding to step 4.1 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 21(a) and 21(b) are schematic views illustrating another state corresponding to step 4.1 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 22(a) and 22(b) are schematic views of another state corresponding to step 4.1 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 23(a) and 23(b) are schematic views illustrating still another state corresponding to step 4.1 in the construction method for erecting a precast pier according to the embodiment of the present invention;

fig. 24(a) and 24(b) are schematic views illustrating a state corresponding to step 4.2 in the construction method for erecting a precast pier according to the embodiment of the present invention;

FIGS. 25(a) and 25(b) are schematic views of states of a highly adjustable bridge pier hoisting machine for completing the assembling work of one bridge pier in the construction method for erecting the prefabricated bridge pier in the embodiment of the invention;

fig. 26(a) and 26(b) are schematic views of states of a highly adjustable pier hoisting machine in the construction method for erecting a prefabricated pier in the embodiment of the invention when the hoisting machine is ready to hoist a pier platform to be hoisted at the next position in front;

FIGS. 27(a) and 27(b) are schematic views showing a state corresponding to step a in the overpass method of the pier hoisting machine with an adjustable height according to the embodiment of the present invention;

FIGS. 28(a) and 28(b) are schematic views showing a state corresponding to step b in the overpass method of the pier hoisting machine with adjustable height according to the embodiment of the present invention;

FIGS. 29(a) and 29(b) are schematic views showing another state corresponding to step b in the overpass method of the pier hoisting machine with adjustable height according to the embodiment of the present invention;

FIGS. 30(a) and 30(b) are schematic views showing a state corresponding to step c in the overpass method of the pier hoisting machine with adjustable height according to the embodiment of the present invention;

FIGS. 31(a) and 31(b) are schematic views showing another state corresponding to step c in the overpass method of the pier hoisting machine with adjustable height according to the embodiment of the present invention;

FIGS. 32(a) and 32(b) are schematic views showing a state corresponding to step d in the overpass method of the pier hoisting machine with adjustable height according to the embodiment of the present invention;

fig. 33(a) and 33(b) are schematic views of another state corresponding to step d in the overpass method of the height-adjustable pier hoisting machine in the embodiment of the present invention.

Description of reference numerals:

1-frame beam assembly, 11-cross beam, 12-main beam; 2-hoisting mechanism, 21-winch, 22-crane trolley, 23-sling; 3-leg assembly, 31-upper section, 32-middle section, 33-leg part, 34-positioning hole; 4-running mechanism, 41-frame, 42-wheel group, 43-telescopic part; 5-climbing mechanism, 51-positioning seat, 511-matching hole and 52-telescopic rod; 71-pier upright columns, 72-pier capping beams and 73-pier end beams; 8-transport vehicle.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the coordinate system XYZ provided herein, the X axis represents forward, the X axis represents backward, the Y axis represents forward, the Y axis represents leftward, the Z axis represents forward, and the Z axis represents backward. Also, it is noted that the terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.

Referring to fig. 1 to 4, an embodiment of the present invention provides a height-adjustable pier hoisting machine, including: a frame beam assembly 1 comprising a cross beam 11; the hoisting mechanism 2 is arranged on the frame beam assembly 1 and used for hoisting the precast pier to be assembled; a leg assembly 3 for supporting the frame beam assembly 1; the leg assembly 3 comprises a split section, the upper end of which is connected to the cross beam 11 and extends through the end of the cross beam 11, and a leg section 33, the lower end of which is detachably connected to the leg section 33, and the cross beam 11 is adapted to move over the split section and the leg section 33.

In this embodiment, the movement of the height-adjustable pier hoisting machine (hereinafter referred to as hoisting machine) in the assembling process of the prefabricated pier can be controlled manually or controlled mechanically, for example, by arranging a control mechanism on the hoisting machine, electrically connecting components such as the hoisting mechanism 2 and the like with the control mechanism, and controlling the movement of the hoisting machine in the assembling process of the prefabricated pier by using the control mechanism, so as to improve the automation degree of the hoisting machine and the construction efficiency of the hoisting machine. The landing leg assembly 3 of hoisting machine is used for supporting frame roof beam assembly 1, strengthens hoisting machine holistic structural strength to guarantee the hoisting mechanism 2 who sets up on frame roof beam assembly 1 the stability when lifting by crane and waiting to assemble prefabricated pier, and guarantee the stability when hoisting machine removes and transports.

The upper end of the splitting part (i.e., the end of the splitting part located in the positive Z-axis direction in fig. 1) is connected to the cross beam 11 and penetrates the end of the cross beam 11, and the lower end of the splitting part (i.e., the end of the splitting part located in the reverse Z-axis direction in fig. 1) is detachably connected to the leg part 33, i.e., the splitting part is located above the leg part 33 (i.e., the positive Z-axis direction in fig. 1); in this way, the height of the leg assembly 3 (i.e. the dimension of the leg assembly 3 in the Z-axis direction in fig. 1) can be adjusted by detaching or installing the detaching part, so that the height of the hoisting machine can be adjusted; moreover, the disassembly part is disassembled to enable the whole height of the hoisting machine to be lowered, so that the hoisting machine can conveniently pass through the height-limited terrains such as the bridge opening of the overpass, the hoisting machine does not need to be disassembled, the convenience of transportation of the hoisting machine when passing through the height-limited terrains such as the bridge opening of the overpass is greatly improved, and the transportation cost of the hoisting machine is saved. In addition, the splitting part of the leg assembly 3 and the leg part 33 are coaxially arranged, so that the cross beam 11 can move on the splitting part and the leg part 33, that is, the end part of the cross beam 11 is suitable for moving on the splitting part and the leg part 33 along the length direction (namely, the Z-axis direction in fig. 1) of the leg assembly 3, and the position of the end part of the cross beam 11 on the leg assembly 3 can be adjusted, so that the heights from the frame beam assembly 1 and the hoisting mechanism 2 to the ground (namely, the distances from the frame beam assembly 1 and the hoisting mechanism 2 to the ground) can be adjusted, the hoisting machine is suitable for hoisting and assembling prefabricated piers to be assembled with different heights (namely, various prefabricated piers to be assembled with different sizes are arranged in the Z-axis direction in fig. 1), and the application range of the hoisting machine is increased.

The part and the shank portion 33 are torn open through setting up to the hoisting machine of this embodiment for landing leg assembly 3's height-adjustable, thereby make the height-adjustable of hoisting machine, so that the hoisting machine is through reducing limit for height topography such as the bridge opening that highly comes through the overline bridge, the convenience of transportation when greatly having promoted the hoisting machine through limit for height topography such as the bridge opening of overline bridge, and make the hoisting machine be suitable for to lift treating of different high specifications and assemble prefabricated pier, the application scope of hoisting machine has been increased.

Optionally, the splitting part includes a plurality of segments, and the plurality of segments are sequentially arranged from top to bottom and detachably connected to each other.

The splitting part is provided with a plurality of segments which are arranged from top to bottom and detachably connected with each other, and for convenience of description, the splitting part is described below to comprise an upper segment 31 and a middle segment 32, wherein at least one middle segment 32 is provided; middle section 32 is located between upper section 31 and leg portion 33, i.e. upper section 31 is located at the upper end of middle section 32 (i.e. upper section 31 is located at the end of middle section 32 located in the positive direction of the Z axis in fig. 1), leg portion 33 is located at the lower end of middle section 32 (i.e. leg portion 33 is located at the end of middle section 32 located in the opposite direction of the Z axis in fig. 1), the end of leg portion 33 away from middle section 32 is used for supporting on the ground or connecting with running mechanism 4 (described later), and leg portion 33 plays a supporting role for upper section 31 and middle section 32. The middle segment 32 is at least provided with one, so, the number of the middle segment 32 can be increased (decreased) by increasing (decreasing) the height of the landing leg assembly 3, the number of the middle segment 32 can be increased (decreased) by increasing (decreasing) the height of the hoisting machine, the hoisting machine can hoist and assemble prefabricated piers to be assembled with different height specifications, the application range of the hoisting machine is further expanded, and the limitation that the existing hoisting machine is only suitable for hoisting piers located in a specific height range due to height fixation is overcome.

Optionally, as shown in fig. 1 and fig. 2, two cross beams 11 are provided, and two ends of each cross beam 11 are provided with the leg assemblies 3; the frame beam assembly 1 further comprises a main beam 12, wherein the main beam 12 is arranged between the two cross beams 11, and two ends of the main beam 12 are respectively connected with the two cross beams 11.

The frame beam assembly 1 comprises two beams 11 and two main beams 12, the two beams 11 are parallel to each other, the main beams 12 are arranged between the two beams 11, and two ends of each main beam 12 are respectively connected with the two beams 11, so that the structural strength of the frame beam assembly 1 is improved. One or more main beams 12 are provided, preferably two main beams 12 are provided in this embodiment, and the two main beams 12 are parallel to each other and perpendicular to the cross beam 11 to ensure the structural strength of the frame beam assembly 1, and the two main beams 12 are both provided with hoisting mechanisms 2 so as to facilitate the hoisting machine to perform various operations on the precast pier to be assembled (for example, rotating and erecting the hoisted precast pier to be assembled); the two ends of each cross beam 11 are respectively provided with one landing leg assembly 3, namely the landing leg assemblies 3 are provided with four, so that the supporting capacity of the landing leg assemblies 3 on the frame beam assembly 1 is improved, and the integral stability of the bridge pier hoisting machine when the hoisting machine is hoisted to be assembled through the hoisting mechanism 2 is guaranteed. Furthermore, a running gear 4 (described later) may be provided at the lower end of each leg assembly 3 to facilitate movement of the hoist. And, crossbeam 11 perpendicular to landing leg assembly 3 for the hoisting machine is the door frame structure, and hoisting machine below has certain space, and the transport vechicle 8 of being convenient for gets into hoisting machine below and hoisting machine lifts by crane and assembles below and wait to assemble prefabricated pier.

Further, the main beam 12 may be disposed between the two cross beams 11, and may also be disposed above or below the two cross beams 11, which is not specifically limited in this embodiment.

Optionally, as shown in fig. 1, the pier hoisting machine with adjustable height further includes a climbing mechanism 5, one end of the climbing mechanism 5 is disposed at an end of the cross beam 11, the other end of the climbing mechanism 5 is sleeved on the landing leg assembly 3, and the end of the cross beam 11 is slidably connected to the landing leg assembly 3 through the climbing mechanism 5.

Climbing mechanism 5 is used to connect cross beam 11 and leg assembly 3, and to achieve a sliding connection between the end of cross beam 11 and leg assembly 3. Specifically, one end of the climbing mechanism 5 connected with the landing leg assembly 3 is sleeved on the landing leg assembly 3, so that the height of the cross beam 11 (namely the distance from the cross beam 11 to the ground) is changed by changing the position of the climbing mechanism 5 on the landing leg assembly 3, the height of the frame beam assembly 1 is changed, the hoisting machine is suitable for hoisting prefabricated piers to be assembled with different heights, and the application range of the hoisting machine is further expanded; and one end of the climbing mechanism 5 connected with the landing leg assembly 3 is suitable for locking the landing leg assembly 3, so that the climbing mechanism 5 is positioned on the landing leg assembly 3, the frame beam assembly 1 is prevented from moving downwards due to overweight load when the hoisting machine hoists the precast pier to be assembled through the hoisting mechanism 2, and the stability of the hoisting machine during working is ensured.

Optionally, as shown in fig. 1 and 4, the climbing mechanism 5 includes a positioning seat 51 and a telescopic rod 52, the positioning seat 51 is sleeved on the leg assembly 3 and is slidably connected with the leg assembly 3, one end of the telescopic rod 52 is fixed on the positioning seat 51, and the other end is fixed on the cross beam 11.

A positioning seat 51 of the climbing mechanism 5 is sleeved on the landing leg assembly 3 and is in sliding connection with the landing leg assembly 3, and the positioning seat 51 is suitable for locking the landing leg assembly 3 so as to realize the positioning of the climbing mechanism 5 on the landing leg assembly 3; the telescopic rod 52 is suitable for stretching in the Z-axis direction in fig. 1, and is used for adjusting the height of the frame beam assembly 1 (i.e. the distance from the frame beam assembly 1 to the ground); based on positioning seat 51 and landing leg assembly 3 sliding connection, through setting up telescopic link 52 for in certain extent (the flexible scope of telescopic link 52), only need can adjust the height of frame roof beam assembly 1 through flexible telescopic link 52, and need not through the position of adjustment positioning seat 51 at landing leg assembly 3, greatly promoted the convenience of hoisting machine construction.

Alternatively, as shown in fig. 1 and 4, the positioning holes 34 are formed on the splitting part and the leg part 33, and the positioning seat 51 and the splitting part or the leg part 33 are adapted to be detachably connected by a locking structure at the positioning holes 34.

The positioning seat 51 of the climbing mechanism 5 locks the landing leg assembly 3 through a locking structure to realize the positioning of the climbing mechanism 5 on the landing leg assembly 3, thereby realizing the positioning of the frame beam assembly 1; the locking structure includes a locking device or fastener (e.g., a pin) that releasably connects the positioning socket 51 to the detachable portion or leg 33 by extending into the positioning hole 34. Specifically, when the locking structure is a pin locking device, the pin locking device is disposed on the positioning seat 51, and the pin locking device has an insertion portion adapted to be extended and retracted, the insertion portion is disposed on a side of the positioning seat 51 facing the leg assembly 3, when the positioning seat 51 of the climbing mechanism 5 moves to a corresponding position on the leg assembly 3, the insertion portion is opposite to the positioning hole 34 at the position, and the insertion portion of the pin locking device is extended to be inserted into the positioning hole 34, so as to complete the positioning of the climbing mechanism 5 on the leg assembly 3; when the locking structure is a fastener, the positioning seat 51 is provided with a fitting hole 511 matched with the positioning hole 34, when the positioning seat 51 of the climbing mechanism 5 moves to a corresponding position on the leg assembly 3, the fitting hole 511 is opposite to the positioning hole 34 at the position, and the positioning of the climbing mechanism 5 on the leg assembly 3 is completed by inserting the fastener into the positioning hole 34 and the fitting hole 511. Therefore, the stability of the hoisting machine during working is ensured by locking the position of the positioning seat 51 on the landing leg assembly 3.

Optionally, as shown in fig. 1 and 3, the height-adjustable pier hoisting machine further includes a traveling mechanism 4, the traveling mechanism 4 includes a frame 41 and a wheel set 42, the frame 41 is used for connecting the wheel set 42 and the leg portion 33; the running gear 4 is adapted to rotate relative to the leg 33.

The walking mechanism 4 is arranged at the lower end of the supporting leg assembly 3, is connected with the supporting leg part 33 of the supporting leg assembly 3 and is used for driving the supporting leg assembly 3 to move; the wheel set 42 is arranged at one end of the frame 41 far away from the leg part 33, is contacted with the ground and is used for realizing the running of the running mechanism 4; the running gear 4 is adapted to rotate relative to the leg 33, either the frame 41 and the set of wheels 42 as a whole relative to the leg 33 or only the set of wheels 42 relative to the leg 33, so as to facilitate steering of the hoist by rotating the running gear 4 when it is moved. In addition, the cross beam 11 and the main beam 12 based on the frame beam assembly 1 are perpendicular to each other, so that the traveling mechanism 4 drives the hoisting machine to perform transverse movement or longitudinal movement on the prefabricated pier assembling site, and the prefabricated pier to be assembled, which is hoisted by the hoisting mechanism 2, is accurately assembled on an abutment to be hoisted (i.e. a foundation for installing the prefabricated pier to be assembled, which is not shown in the figure); here, the lateral movement refers to movement in the longitudinal direction of the main beam 12 (i.e., the X-axis direction in fig. 1), and the longitudinal movement refers to movement in the longitudinal direction of the cross beam 11 (i.e., the Y-axis direction in fig. 1). Moreover, the travelling mechanism 4 is arranged, so that the hoisting machine can be used as special equipment for assembling the prefabricated bridge pier, and the hoisting machine hoists the prefabricated bridge pier to be assembled through the hoisting mechanism 2 so as to move the prefabricated bridge pier to be assembled to the abutment to be assembled for assembling; compared with the assembly of the prefabricated bridge pier by adopting a crawler crane or a truck crane in the prior art, the position of the hoisting machine does not need to be set in advance by adopting the hoisting machine in the embodiment, and preparation work such as counterweight addition is not needed, so that the assembly construction efficiency of the prefabricated bridge pier is improved, and the construction time is saved.

Further, in the embodiment, it is preferable that the wheel set 42 is adapted to rotate relative to the leg portion 33 to reduce the difficulty of rotation of the running mechanism 4, and the rotation angle of the wheel set 42 is within a range of 90 ° ± 10 °, so as to prevent the problem that the sling is switched from the longitudinal movement to the lateral movement (or from the lateral movement to the longitudinal movement) when the rotation angle of the wheel set 42 is too small (i.e. when the rotation angle of the wheel set 42 is less than 80 °), and to prevent the difficulty of design and manufacture of the running mechanism 4 from increasing when the rotation angle of the wheel set 42 is too large (i.e. when the rotation angle of the wheel set 42 is greater than 100 °).

Optionally, as shown in fig. 1 and 3, the running gear 4 further comprises a telescopic member 43 disposed at one end of the frame 41 far from the leg portion 33, and one end of the telescopic member 43 is fixed to the frame 41 and the other end is adapted to be supported on or separated from the ground.

In the embodiment, the telescopic piece 43 is suitable for being telescopic, when the hoisting machine moves, the telescopic piece 43 is separated from the ground, when the hoisting machine hoists the precast pier to be assembled, the telescopic piece 43 is supported on the ground to support the landing leg assembly 3, so that the wheel set 42 is prevented from being crushed or the wheel set 42 is prevented from slipping and moving due to overweight load when the hoisting machine hoists the precast pier to be assembled through the hoisting mechanism 2, and the stability of the hoisting machine during working is ensured; and the setting of extensible member 43 has made things convenient for wheelset 42 to rotate, that is to say, when extensible member 43 supported on ground, wheelset 42 received the pressure reduction or disappearance of landing leg assembly 3 and frame beam assembly 1 (wheelset 42 was unsettled this moment), thereby be convenient for wheelset 42 to rotate in order to realize the steering of running gear 4.

Optionally, the wheelset 42 includes a plurality of running wheels with the telescoping member 43 located therebetween.

The wheel set 42 comprises a plurality of running wheels to increase the contact area of the running mechanisms 4 with the ground, so as to ensure the stability of the hoisting machine at each running mechanism 4; the extensible member 43 is positioned between the plurality of running wheels, so that the extensible member 43 and the landing leg assembly 3 are arranged coaxially, and the supporting effect on the landing leg assembly 3 when the extensible member 43 is supported on the ground is ensured. Through setting up extending member 43 and a plurality of walking wheel for a plurality of walking wheels and extending member 43 all can regard as the fulcrum when hoisting machine lifts by crane mechanism 2 and waits to assemble prefabricated pier, have guaranteed the stability of the during operation fuselage of hoisting machine, have increased security and the reliability during hoisting machine construction.

Optionally, as shown in fig. 1 to 4, the hoisting mechanism 2 includes a hoist 21, a trolley 22, a spreader 23 and a traversing cylinder, the hoist 21 is disposed on the cross beam 11, the trolley 22 is disposed on the main beam 12, and the spreader 23 is located below the trolley 22 and is adapted to be connected to a precast pier to be assembled; one end of the transverse oil cylinder is fixed on the main beam 12, the other end of the transverse oil cylinder is fixed on the trolley 22, and the trolley 22 is suitable for moving along the length direction of the main beam 12 through the transverse oil cylinder on the main beam 12.

In this embodiment, two main beams 12 are preferably provided, and preferably, two lifting mechanisms 2 are provided on each main beam 12, the trolley 22 of each lifting mechanism 2 is connected with one traversing cylinder, and the trolley 22 is driven to translate on the main beam 12 along the length direction of the main beam 12 (i.e., the X-axis direction in fig. 1) by the extension and retraction of the traversing cylinder, so as to adjust the position of the trolley 22 on the main beam 12 or the distance between the two trolleys 22, so as to meet the requirement of hoisting operation; the lifting appliance 23 is located below the crane trolley 22 and used for being connected with the precast pier to be assembled when the precast pier to be assembled is lifted, the winch 21, the crane trolley 22 and the lifting appliance 23 are sequentially connected through a rope or a chain, the lifting appliance 23 moves along with the crane trolley 22 in the length direction of the main beam 12, the movement of the lifting appliance 23 in the length direction of the main beam 12 is achieved, and the movement of the lifting appliance 23 in the length direction of the landing leg assembly 3 is achieved through unreeling or reeling of the rope (or the chain) through the winch 21.

Further, the hoist 21 may be disposed on the main beam 12 and located at an end of the main beam 12.

Further, the end of the traversing cylinder far away from the trolley 22 can also be fixed on the cross beam 11.

The embodiment of the invention also provides a construction method for erecting the prefabricated bridge pier, which adopts the height-adjustable bridge pier hoisting machine and comprises the following steps:

step 1, a transport vehicle 8 transports a pier column 71 to enter the position below a height-adjustable pier hoisting machine, the height-adjustable pier hoisting machine hoists the pier column 71, and the pier column 71 is vertically installed on a pier to be hoisted;

before the pier assembly work is carried out, the hoisting machine needs to be moved to the side of the pier to be hoisted in advance, so that the distance from the hoisting machine to the pier to be hoisted after the prefabricated pier to be assembled is hoisted by the hoisting machine is reduced; the prefabricated bridge pier to be assembled comprises a bridge pier upright 71, a bridge pier capping beam 72 and a bridge pier end beam 73; referring to fig. 5 to 9, wherein fig. 5(a) to 9(a) are left side views of fig. 5(b) to 9(b), respectively, step 1 specifically includes the following steps:

step 1.1, a traveling mechanism 4 of a hoisting machine drives the hoisting machine to move to the side of a pier to be hoisted, a transport vehicle 8 transports a pier upright column 71 to enter the lower part of the hoisting machine, a hoisting mechanism 2 of the hoisting machine hoists the pier upright column 71, and the transport vehicle 8 exits the lower part of the hoisting machine and returns to a beam field to take beams (it is worth explaining that a plurality of transport vehicles 8 can also respectively transport the pier upright column 71, a pier capping beam 72 and a pier end beam 73);

step 1.2, erecting the pier upright column 71 through the retraction and extension action of a hoisting machine; the hoisting machine moves to the position above the abutment to be hoisted, and the pier column 71 is installed on the abutment to be hoisted. In this step, the pier columns 71 are simultaneously hoisted by the hoisting mechanisms 2 on the two main beams 12, the hoisted pier columns 71 are in a horizontal state, and then the hoisting mechanisms 2 on one main beam 12 retract the lifting appliance 23 upwards (namely, the Z axis is positive in fig. 15) and the hoisting mechanism 2 on the other main beam 12 puts the lifting appliance 23 downwards (namely, the Z axis is negative in fig. 15) through the retracting and releasing actions of the hoisting mechanisms 2, so that the pier columns 71 are changed from the horizontal state to a vertical state to be conveniently spliced with piers to be hoisted; moreover, since the hoisting machine is moved from the previous pier to be hoisted, which completes the pier assembling work, before hoisting the pier column 71, the traveling mechanism 4 needs to rotate by 90 ° before the hoisting machine moves above the pier to be hoisted, so that the hoisting machine moves laterally above the pier to be hoisted.

Step 2, the transport vehicle 8 transports the pier column 71 to enter the position below the height-adjustable pier hoisting machine, the height-adjustable pier hoisting machine hoists the pier column 71, and the pier column 71 is vertically installed on a pier to be hoisted;

specifically, referring to fig. 10 to 14, wherein fig. 10(a) to 14(a) are left side views of fig. 10(b) to 14(b), respectively, step 2 includes the following steps:

step 2.1, the traveling mechanism 4 drives the hoisting machine to move to the side of a pier to be hoisted, the transport vehicle 8 transports the pier capping beam 72 to enter the lower part of the hoisting machine, the rotary disc of the transport vehicle 8 rotates to adjust the position until the two ends of the pier capping beam 72 placed on the rotary disc are positioned below the same main beam 12 (at the moment, the axis of the pier capping beam 72 is parallel to the axis of the main beam 12, so that two hoisting mechanisms 2 on one main beam 12 hoist the pier capping beam 72 at the same time), the hoisting mechanisms 2 of the hoisting machine hoist the pier capping beam 72, and the transport vehicle 8 exits the lower part of the hoisting machine and returns to a beam field to take the beam;

and 2.2, moving the hoisting machine to the position above the pier to be hoisted, and assembling the pier capping beam 72 to the pier upright 71.

Step 3, the transport vehicle 8 transports the pier end beam 73 to enter the position below the height-adjustable pier hoisting machine, the height-adjustable pier hoisting machine hoists the pier end beam 73 and moves the pier end beam to the end part of the pier capping beam 72 so as to assemble the pier end beam 73 and the pier capping beam 72;

specifically, referring to fig. 15 to 19, wherein fig. 15(a) to 19(a) are left side views of fig. 15(b) to 19(b), respectively, step 3 includes the following steps:

step 3.1, the traveling mechanism 4 drives the hoisting machine to move to the side of a pier to be hoisted, the transport vehicle 8 transports the pier end beam 73 to enter the lower part of the hoisting machine, the rotary disc of the transport vehicle 8 rotates to adjust the position until the two ends of the pier end beam 73 placed on the rotary disc are positioned below the same main beam 12, the hoisting mechanism 2 of the hoisting machine hoists the pier end beam 73, and the transport vehicle 8 exits the lower part of the hoisting machine and returns to a beam yard to take the beam;

and 3.2, moving the hoisting machine to the position above the pier to be hoisted, and assembling the pier end beam 73 to the pier capping beam 72.

And 4, repeating the step 3 to complete the assembly of the other pier end beam 73.

Specifically, referring to fig. 20 to 24, wherein fig. 20(a) to 24(a) are left side views of fig. 20(b) to 24(b), respectively, step 4 includes the following steps:

step 4.1, the traveling mechanism 4 drives the hoisting machine to move to the side of the pier to be hoisted, the transport vehicle 8 transports the pier end beam 73 to enter the lower part of the hoisting machine, the rotary disc of the transport vehicle 8 rotates to adjust the position until the two ends of the pier end beam 73 placed on the rotary disc are positioned below the same main beam 12, the hoisting mechanism 2 of the hoisting machine hoists the pier end beam 73, and the transport vehicle 8 exits the lower part of the hoisting machine and returns to a beam yard to take the beam;

and 4.2, moving the hoisting machine to the position above the pier to be hoisted, and assembling the pier end beam 73 to the pier capping beam 72.

In this embodiment, the assembling of each part of the prefabricated pier is completed through steps 1 to 4. And, referring to fig. 25-26, wherein fig. 25(a) and 26(a) are left side views of fig. 25(b) and 26(b), respectively, after the hoisting machine completes the assembling work of one pier, the traveling mechanism 4 drives the hoisting machine to move away from the pier, and then the traveling mechanism 4 rotates 90 degrees and drives the hoisting machine to move to the next pier to be hoisted, and the assembling of each part of the prefabricated pier is completed through steps 1-4 again.

The embodiment of the invention also provides an overpass method of the height-adjustable pier hoisting machine, which adopts the height-adjustable pier hoisting machine and comprises the following steps:

step a, a frame beam assembly 1 of the height-adjustable bridge pier hoisting machine falls down, a split part of a landing leg assembly 3 of the height-adjustable bridge pier hoisting machine is disassembled, the split part is installed on a transport vehicle 8 to serve as a bracket, and the transport vehicle 8 runs to the position below the height-adjustable bridge pier hoisting machine;

as shown in fig. 27, in this step, the end of the cross beam 11 slides down along the leg assembly 3 to the leg portion 33, and at this time, the detaching part is detached and installed on the transportation vehicle 8 as a bracket, so as to support the frame beam assembly 1 on the transportation vehicle 8, thereby avoiding the occurrence of easy collision and damage when the frame beam assembly 1 is directly placed on the transportation vehicle 8; therefore, the height of the hoisting machine is reduced.

Step b, the frame beam assembly 1 falls on the bracket;

as shown in fig. 28 and 29, in this step, the end of the cross beam 11 continues to slide down along the leg assembly 3 to the main beam 12 of the frame beam assembly 1 and/or the cross beam 11 falls onto a bracket on the transportation vehicle 8, so that the transportation vehicle 8 can support the frame beam assembly 1.

And c, jacking the frame beam assembly 1 to the leg part 33 of the leg assembly 3 away from the ground by the transport vehicle 8, and transporting the height-adjustable bridge pier hoisting machine to pass through the bridge opening of the overpass by the transport vehicle 8.

Referring to fig. 31 to 33, in this step, since the crane is not provided with the traveling mechanism 4, and the leg portion 33 of the leg assembly 3 is supported on the ground, the carrier 8 can lift the leg assembly 3 together with the frame beam assembly 1 and make the leg portion 33 leave the ground, so that the carrier 8 can smoothly transport the crane through the limited-height terrain such as the bridge opening of the overpass.

Further, based on the overpass method of the height-adjustable pier hoisting machine, when the hoisting machine is provided with the traveling mechanism 4, the corresponding overpass method of the height-adjustable pier hoisting machine comprises the following steps:

step a1, the frame beam assembly 1 of the height-adjustable bridge pier hoisting machine falls down, the split part of the landing leg assembly 3 of the height-adjustable bridge pier hoisting machine is disassembled, the split part is installed on the transport vehicle 8 to serve as a bracket, and the transport vehicle 8 runs to the position below the height-adjustable bridge pier hoisting machine;

Step b1, the frame beam assembly 1 continuously falls to the main beam 12 of the frame beam assembly 1 and falls on the bracket, the connection between the landing leg assembly 3 and the walking mechanism 4 is disconnected, and the transport vehicle 8 lifts the frame beam assembly 1 until the landing leg assembly 3 is separated from the walking mechanism 4;

referring to fig. 28 and 29, in this step, the end of the cross beam 11 continues to slide down along the leg assembly 3 to the main beam 12 and/or the cross beam 11 falls onto the bracket of the transportation vehicle 8, at this time, the connection between the frame 41 of the running mechanism 4 and the leg portion 33 of the leg assembly 3 (such as a bolt, a pin, etc.) is removed, so that the connection between the leg assembly 3 and the running mechanism 4 is disconnected, then, the transportation vehicle 8 lifts up the frame beam assembly 1 by a small height (for example, 100mm) through the suspension cylinder, at this time, the leg portion 33 is lifted up together due to the connection with the cross beam 11 of the frame beam assembly 1, so that the leg assembly 3 is separated from the running mechanism 4; wherein, the suspension hydro-cylinder is used for jacking up the position that bears of transport vechicle 8 (i.e. transport vechicle 8 is used for bearing the position of frame roof beam assembly 1 through the bracket), and transport vechicle 8 is through bearing the position jacking with the bracket with be located the jack-up of frame roof beam assembly 1 on the bracket, so, because transport vechicle 8 bears the position and has a plurality of strong points (i.e. the contact department of a plurality of brackets and frame roof beam assembly 1) to frame roof beam assembly 1, for using the mobile crane to hoist frame roof beam assembly 1, use suspension hydro-cylinder jacking frame roof beam assembly 1 can effectively guarantee the stability of frame roof beam assembly 1 in the motion process.

Step c1, the transport vehicle 8 moves to one side of the walking mechanism 4, the frame beam assembly 1 falls to the leg part 33 of the leg assembly 3 to be supported on the ground, the frame beam assembly 1 is separated from the bracket, the transport vehicle 8 leaves the lower part of the height-adjustable pier hoisting machine, and the dismantling part arranged on the transport vehicle 8 is unloaded;

as shown in fig. 30 and 31, in this step, the transportation vehicle 8 transports the frame beam assembly 1 and the leg assembly 3 away from the running mechanism 4, so that the leg portion 33 of the leg assembly 3 can be directly supported on the ground after the frame beam assembly 1 falls down. Specifically, after the carrier vehicle 8 transports the frame beam assembly 1 and the leg assembly 3 away from the running mechanism 4, the leg portion 33 falls down relative to the frame beam assembly 1 to be supported on the ground, so as to support the frame beam assembly 1 and jack the frame beam assembly 1 to be separated from the bracket. Then, the transport vehicle 8 moves to a position below the frame beam assembly 1, and the detaching part mounted on the transport vehicle 8 is detached at this time, so that the overall height of the transport vehicle 8 is further reduced when the transport vehicle 8 transports the hoisting machine in the subsequent step, and the transport vehicle 8 transports the hoisting machine through the bridge opening and other height-limiting terrains of the overpass.

And d1, moving the transport vehicle 8 to the position below the height-adjustable bridge pier hoisting machine, jacking the frame beam assembly 1 to the leg part 33 of the leg assembly 3 to leave the ground, and transporting the height-adjustable bridge pier hoisting machine to pass through the bridge opening of the overpass by the transport vehicle 8.

As shown in fig. 31 to 33, in this step, the transport vehicle 8 transports the hoist reduced in height by detaching the detaching part smoothly through the bridge opening of the overpass. Further, for step c1 and step d1, after the hoist is disassembled from the disassembling parts, if the height of the transport vehicle 8 during transporting the hoist is enough to pass through the height-limited terrains such as the bridge opening of the overpass, the transport vehicle 8 can be used as the disassembling part of the bracket in the step c1 without unloading, and at the moment, the transport vehicle 8 can directly bear the height-limited terrains such as the bridge opening of the overpass through the bracket, so that the stability of the hoist on the transport vehicle 8 is ensured.

Further, based on the overpass method of the height-adjustable pier hoisting machine, when the hoisting machine is provided with the traveling mechanism 4 and the split part comprises a plurality of segments (for convenience of description, the split part comprises an upper segment 31 and a middle segment 32, wherein at least one middle segment 32 is provided); the overpass method of the corresponding height-adjustable bridge pier hoisting machine comprises the following steps:

step a2, the frame beam assembly 1 of the height-adjustable pier hoisting machine falls down, the upper section 31 of the landing leg assembly 3 of the height-adjustable pier hoisting machine is detached, the upper section 31 is installed on the transport vehicle 8 to serve as a bracket, and the transport vehicle 8 runs to the position below the height-adjustable pier hoisting machine;

as shown in fig. 27, in this step, the end of the cross beam 11 slides down along the leg assembly 3 to leave the upper section 31, at this time, the upper section 31 is detached and the detached upper section 31 is mounted on the transportation vehicle 8 as a bracket to support the frame beam assembly 1 on the transportation vehicle 8, so as to avoid the occurrence of a situation that the frame beam assembly 1 is easily damaged by collision when directly placed on the transportation vehicle 8; therefore, the height of the hoisting machine is initially reduced.

Step b2, the frame beam assembly 1 continuously falls to the main beam 12 of the frame beam assembly 1 and falls on the bracket, the connection between the landing leg assembly 3 and the walking mechanism 4 is disconnected, and the transport vehicle 8 lifts the frame beam assembly 1 until the landing leg assembly 3 is separated from the walking mechanism 4;

referring to fig. 28 and 29, in this step, the end of the cross beam 11 continues to slide down along the leg assembly 3 to the main beam 12 and/or the cross beam 11 falls onto the bracket of the transportation vehicle 8, at this time, the connection between the frame 41 of the running mechanism 4 and the leg portion 33 of the leg assembly 3 is removed (e.g., bolts, pins, etc.), so that the leg assembly 3 is disconnected from the running mechanism 4, then, the transportation vehicle 8 lifts the frame beam assembly 1 by a small height (e.g., 100mm) through the suspension cylinder, at this time, the leg assembly 3 with the upper section 31 removed is lifted together due to the connection with the cross beam 11 of the frame beam assembly 1, so that the leg assembly 3 is separated from the running mechanism 4.

Step c2, the transport vehicle 8 moves to one side of the walking mechanism 4, the frame beam assembly 1 falls to the leg part 33 of the leg assembly 3 to be supported on the ground, the frame beam assembly 1 is separated from the bracket, the transport vehicle 8 leaves the lower part of the height-adjustable pier hoisting machine, and the upper section 31 arranged on the transport vehicle 8 is unloaded;

as shown in fig. 30 and 31, in this step, the transportation vehicle 8 transports the frame beam assembly 1 and the leg assembly 3 away from the running mechanism 4, so that the leg portion 33 of the leg assembly 3 can be directly supported on the ground after the frame beam assembly 1 falls down. Specifically, after the carrier vehicle 8 transports the frame beam assembly 1 and the leg assembly 3 away from the running mechanism 4, the leg portion 33 falls down relative to the frame beam assembly 1 to be supported on the ground, so as to support the frame beam assembly 1 and jack the frame beam assembly 1 to be separated from the bracket. The carriage 8 is then moved away from under the frame beam assembly 1, at which point the upper section 31 mounted on the carriage 8 is unloaded.

And d2, detaching the middle section 32 of the landing leg assembly 3, installing the middle section 32 on the transport vehicle 8, moving the transport vehicle 8 to the position below the pier hoisting machine with the adjustable height, jacking the frame beam assembly 1 to the leg part 33 of the landing leg assembly 3 to leave the ground, and transporting the pier hoisting machine with the adjustable height to pass through the bridge opening of the overpass by the transport vehicle 8.

As shown in fig. 31 to 33, there are a plurality of middle segments 32, and the heights of the plurality of middle segments 32 may be equal or unequal. Therefore, in this step, when there is one middle section 32, the middle section 32 of the leg assembly 3 is detached and the middle section 32 is mounted on the carrier vehicle 8 while the end of the cross member 11 is moved along the leg assembly 3 to the leg portion 33; when the number of the middle sections 32 is plural, when one or more middle sections 32 exist at the end of the cross beam 11 moving along the leg assembly 3 to above the end of the cross beam 11, removing the one or more middle sections 32 of the leg assembly 3 above the end of the cross beam 11, and mounting the middle sections 32 on the transport vehicle 8, wherein when the plurality of middle sections 32 are removed, if the heights of the plurality of removed middle sections 32 are consistent, one of the plurality of removed middle sections is optionally mounted on the transport vehicle 8, and if the heights of the plurality of removed middle sections 32 are inconsistent, the shorter one of the plurality of removed middle sections is selected to be mounted on the transport vehicle 8; so for when installing middle segment 32 on transport vechicle 8 as new bracket support frame roof beam assembly 1, the whole height of hoisting machine on transport vechicle 8 is lower, with the bridge opening of guaranteeing that the hoisting machine passes through the overline bridge smoothly. After the middle section 32 is mounted on the carrier vehicle 8, the carrier vehicle 8 moves to below the frame beam assembly 1 and lifts the frame beam assembly 1 to the leg portion 33 of the leg assembly 3 off the ground, thereby transporting the hoist through the bridge opening of the overpass.

It should be noted that the hoist has a plurality of leg assemblies 3, and the operation of the split portions of the plurality of leg assemblies 3 and the leg portions 33 should be kept consistent.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.

Claims

1. The utility model provides a pier hoisting machine with adjustable height which characterized in that includes:

a frame beam assembly (1) comprising a cross beam (11);

the hoisting mechanism (2) is arranged on the frame beam assembly (1) and used for hoisting the precast pier to be assembled;

a leg assembly (3) for supporting the frame beam assembly (1);

the supporting leg assembly (3) comprises a splitting part and a supporting leg part (33), the upper end of the splitting part is connected with the cross beam (11) and penetrates through the end part of the cross beam (11), the lower end of the splitting part is detachably connected with the supporting leg part (33), and the cross beam (11) is suitable for moving on the splitting part and the supporting leg part (33).

2. The pier hoisting machine with the adjustable height of claim 1, wherein the splitting part comprises a plurality of segments, and the segments are sequentially arranged from top to bottom and detachably connected with each other.

3. The pier hoisting machine with the adjustable height of claim 1, further comprising a climbing mechanism (5), wherein one end of the climbing mechanism (5) is arranged at the end of the cross beam (11), the other end of the climbing mechanism (5) is sleeved on the leg assembly (3), and the end of the cross beam (11) is slidably connected with the leg assembly (3) through the climbing mechanism (5).

4. The pier hoisting machine with adjustable height of claim 3, wherein the climbing mechanism (5) comprises a positioning seat (51) and a telescopic rod (52), the positioning seat (51) is sleeved on the leg assembly (3) and is slidably connected with the leg assembly (3), one end of the telescopic rod (52) is fixed on the positioning seat (51), and the other end of the telescopic rod is fixed on the cross beam (11).

5. The pier hoisting machine with adjustable height of claim 4, wherein the splitting part and the leg part (33) are provided with positioning holes (34), and the positioning seat (51) and the splitting part or the leg part (33) are adapted to be detachably connected at the positioning holes (34) through locking structures.

6. The pier hoisting machine with adjustable height of any one of claims 1 to 5, wherein there are two beams (11), and the two ends of each beam (11) are provided with the leg assemblies (3); the frame beam assembly (1) further comprises a main beam (12), wherein the main beam (12) is arranged between the two cross beams (11), and two ends of the main beam (12) are respectively connected with the two cross beams (11).

7. The pier hoisting machine with adjustable height of any one of claims 1-5, further comprising a running mechanism (4), wherein the running mechanism (4) comprises a frame (41) and a wheel set (42), and the frame (41) is used for connecting the wheel set (42) with the leg portion (33); the running gear (4) is adapted to rotate relative to the leg (33).

8. The pier hoisting machine with adjustable height of claim 7, wherein the running mechanism (4) further comprises an expansion piece (43) disposed at one end of the frame (41) far away from the leg portion (33), and one end of the expansion piece (43) is fixed on the frame (41) and the other end is adapted to be supported on or separated from the ground.

9. The pier hoisting machine with adjustable height of claim 8, wherein the wheel set (42) comprises a plurality of running wheels, and the telescopic member (43) is located between the plurality of running wheels.

10. The pier hoisting machine with the adjustable height of claim 6, wherein the hoisting mechanism (2) comprises a hoist (21), a crane trolley (22), a sling (23) and a traversing cylinder, the hoist (21) is arranged on the cross beam (11), the crane trolley (22) is arranged on the main beam (12), and the sling (23) is positioned below the crane trolley (22) and is suitable for being connected with the pier prefabrication to be assembled; one end of the transverse oil cylinder is fixed on the main beam (12), the other end of the transverse oil cylinder is fixed on the trolley (22), and the trolley (22) is suitable for moving along the length direction of the main beam (12) through the transverse oil cylinder on the main beam (12).

11. A construction method for erecting a prefabricated pier by using the height-adjustable pier hoisting machine according to any one of claims 1 to 10, comprising:

step 1, a transport vehicle (8) transports a pier column (71) to enter the position below the height-adjustable pier hoisting machine, the height-adjustable pier hoisting machine hoists the pier column (71), and the pier column (71) is vertically installed on a pier to be hoisted;

step 2, the transport vehicle (8) transports the pier capping beam (72) to enter the lower part of the height-adjustable pier hoisting machine, the height-adjustable pier hoisting machine hoists the pier capping beam (72) and moves the pier capping beam to the upper part of the pier upright column (71), so that the pier capping beam (72) and the pier upright column (71) are assembled;

step 3, the transport vehicle (8) transports the pier end beam (73) to enter the position below the height-adjustable pier hoisting machine, the height-adjustable pier hoisting machine hoists the pier end beam (73) and moves the pier end beam to the end part of the pier capping beam (72) so as to assemble the pier end beam (73) and the pier capping beam (72);

and 4, repeating the step 3 to complete the assembly of the other pier end beam (73).

12. An overpass method of a pier hoisting machine with adjustable height, which adopts the pier hoisting machine with adjustable height of any one of claims 1 to 10, characterized by comprising:

step a, a frame beam assembly (1) of the height-adjustable bridge crane falls down, a split part of a landing leg assembly (3) of the height-adjustable bridge crane is disassembled, the split part is installed on a transport vehicle (8) to serve as a bracket, and the transport vehicle (8) runs to the position below the height-adjustable bridge crane;

b, the frame beam assembly (1) falls onto the bracket;

and c, jacking the frame beam assembly (1) to the leg part (33) of the leg assembly (3) away from the ground by the transport vehicle (8), and transporting the height-adjustable bridge pier hoisting machine to pass through a bridge opening of the overpass by the transport vehicle (8).