CN115748488A - Pier cast-in-place box girder construction device and construction process - Google Patents

Abstract

The application discloses cast-in-place box girder construction equipment of pier and construction process belongs to bridge construction field, and its cast-in-place box girder construction equipment of pier, including cope match-plate pattern and lower bolster, it has last folding template to articulate on the cope match-plate pattern, go up folding template with the articulated department of cope match-plate pattern is provided with the torsional spring, it has lower folding template to articulate on the lower bolster, lower folding template with the articulated department of lower bolster also is provided with the torsional spring, it is provided with the side template to slide on the lower bolster, be used for the drive on the lower bolster the folding assembly that the side template removed, be provided with on the cope match-plate pattern and be used for fixing the first fixed subassembly of last folding template, be provided with on the lower bolster and be used for fixing the fixed subassembly of second of lower folding template. This application has the effect that makes things convenient for operating personnel to carry out quick demolishment to the template of mandrel on the case roof beam.

Description

Pier cast-in-place box girder construction device and construction process

Technical Field

The application relates to the field of bridge construction, in particular to a pier cast-in-place box girder construction device and a construction process.

Background

The box girder is a reinforced concrete girder body with hollow interior and flanges on two sides of the upper part, and is mainly applied to bridge engineering. The box girder of reinforced concrete structure divide into prefabricated box girder and cast-in-place box girder, and cast-in-place box girder need build the template before the shaping, and the template divide into mandrel and side form template, and the template of mandrel is used for supporting the concrete of the inside hollow position of box girder, and the side form template is used for supporting box girder side and bottom surface position.

After the box girder concrete is formed, when an operator removes a template of a core mould, the operator needs to enter a hollow position of the box girder to remove the core mould due to the fact that a large amount of angle steel and bolts are used for connection when removing the template of the core mould, and due to the fact that the space of the hollow position of the box girder is limited, the efficiency is low in the core mould removing process, and certain potential safety hazards exist simultaneously.

Disclosure of Invention

In order to facilitate quick removal of a formwork of a core formwork by an operator, the application provides a pier cast-in-place box girder construction device and a pier cast-in-place box girder construction process.

The application provides a cast-in-place box girder construction equipment of pier and construction process adopts following technical scheme:

the pier cast-in-place box girder construction device comprises an upper template and a lower template, wherein an upper folding template is hinged to the upper template, a torsion spring is arranged at the hinged position of the upper template, a lower folding template is hinged to the lower template, a torsion spring is also arranged at the hinged position of the lower template, a side template is arranged on the lower template in a sliding mode, a folding assembly used for driving the side template to move is arranged on the lower template, a first fixing assembly used for fixing the upper folding template is arranged on the upper template, and a second fixing assembly used for fixing the lower folding template is arranged on the lower template.

Through adopting the above technical scheme, before the case roof beam is pour, need the cope match-plate pattern, the lower bolster, go up folding template, all paint the release agent on lower folding template and the side template, pour at the case roof beam and accomplish the back, folding assembly drive side template removes and is close to between cope match-plate pattern and the lower bolster, the side template removes and accomplishes the back, first fixed subassembly stops to fix and goes up folding template, under the effect of torsional spring, it buckles and is close to the side template to go up folding template, the fixed subassembly of second stops to fix folding template down, lower folding template buckles under the effect of torsional spring on the lower bolster, operating personnel pulls out the device is whole through the tractor this moment, do not need to dismantle bolt and template many times, make things convenient for constructor's the work of form removal.

Preferably, the folding assembly comprises a first mounting seat and a connecting screw rod, the first mounting seat is rotatably installed on the lower template, the connecting screw rod penetrates into the first mounting seat, the connecting screw rod is kept away from the end of the first mounting seat penetrates into the side template, the connecting screw rod is in sliding connection with the side template, the connecting screw rod is located the end in the side template is provided with an auxiliary pulley, a first sliding groove matched with the sliding of the auxiliary pulley is formed in the side template, a first driving assembly for driving the first mounting seat to rotate is arranged on the lower template, and a second driving assembly for driving the connecting screw rod to move is arranged on the first mounting seat.

Through adopting above-mentioned technical scheme, pour the case roof beam or pour at the case roof beam and accomplish the back, first mount pad of drive assembly drive rotates, first mount pad rotates and pulls the connecting screw rod and remove, the connecting screw rod removes and pulls the side template and removes, when first mount pad rotates, the second drive assembly drive connecting screw rod removes and makes the connecting screw rod prolong in first mount pad, make the side template displacement distance bigger when expanding, when first mount pad antiport, the second drive assembly drive connecting screw rod contracts to in the first mount pad, be close to side template and adjacent side template each other.

Preferably, the first driving assembly comprises a movable sleeve and a driving screw rod, the movable sleeve is arranged on the first mounting seat in a sliding mode, a second sliding groove used for being matched with the movable sleeve in a sliding mode is formed in the first mounting seat, the driving screw rod is installed on the lower template in a rotating mode and penetrates through the movable sleeve, the driving screw rod is in threaded fit with the movable sleeve, and a third driving assembly used for driving the driving screw rod to rotate is arranged on the lower template.

Through adopting above-mentioned technical scheme, when the shrink of side template or expansion, third drive assembly makes the drive lead screw rotate, and the drive lead screw rotates and makes movable sleeve remove, and movable sleeve removes and makes movable sleeve slide and pull first mount pad in the second spout and rotate, and first mount pad rotates and makes first mount pad pull the connection lead screw and remove, thereby the connection lead screw removes and makes the side template remove and make the shrink of side template or expand.

Preferably, the third drive assembly includes motor and belt pulley, the motor set up in on the lower bolster, the motor output and all fixed the cover is equipped with the belt pulley on the drive lead screw, around being equipped with driving belt on the belt pulley.

Through adopting above-mentioned technical scheme, when side template shrink or expansion, the motor starts, motor drive belt pulley rotates, belt pulley rotates on the motor makes the belt pulley on the drive lead screw rotate through driving belt, thereby the drive lead screw rotates, the drive lead screw rotates and makes the movable sleeve remove, the movable sleeve removes and makes the movable sleeve slide and pull first mount pad and rotate in the second spout, first mount pad rotates and makes first mount pad pull the connection lead screw and remove, thereby the connection lead screw removes and makes the side template remove and make the side template shrink or expand.

Preferably, the second driving assembly comprises a driving sleeve, the driving sleeve is rotatably installed in the first installation seat, a first accommodating groove used for being in sliding fit with the driving sleeve is formed in the first installation seat, the driving sleeve is sleeved on the end portion, located in the first installation seat, of the connecting screw rod, the driving sleeve is in threaded fit with the connecting screw rod, and a fourth driving assembly used for driving the driving sleeve to rotate is arranged on the first installation seat.

Through adopting above-mentioned technical scheme, when first mount pad of first drive assembly drive rotated, fourth drive assembly made the drive sleeve rotate, because under the restriction of auxiliary pulley, the drive sleeve rotated and made the connection lead screw remove, the connection lead screw removes and makes the side template remove, under the effect of connection lead screw, even the length of first mount pad receives the restriction, the connection lead screw also can promote the side template to farther distance, further improve the folding ability of device, reduce the volume after the device is folding.

Preferably, the fourth drive assembly includes first straight gear and crown gear, wear to be equipped with the column spinner in the first mount pad, the column spinner penetrates first holding tank passes first mount pad, the column spinner with first mount pad rotates to be connected, column spinner one end with the cope match-plate pattern rotates to be connected, the column spinner other end with the lower bolster rotates to be connected, the fixed cover of first straight gear is located the column spinner is located on the tip in the first holding tank, the fixed cover of crown gear is located on the driving sleeve, first straight gear with crown gear intermeshing.

Through adopting above-mentioned technical scheme, when first mount pad of first drive assembly drive rotated, first mount pad rotated and made first straight gear drive crown gear rotate, thereby crown gear rotates and makes the drive sleeve rotate the drive sleeve and rotate and make the connecting screw remove.

Preferably, the first fixing assembly comprises a fixing pin and an inserting seat, the fixing pin penetrates through the upper template in a sliding mode, the inserting seat is arranged on the end wall, close to the upper template, of the upper folding template, the fixing pin is in inserting fit with the inserting seat, the fixing pin is far away from a first return spring fixedly connected to the end portion of the inserting seat, the first return spring is far away from the end portion of the fixing pin and fixedly connected with the upper template, and the fixing pin is abutted to the side template.

Through adopting above-mentioned technical scheme, when folding assembly drive side template removes and makes the device contract, the side template is about to remove when the shrink position, fixed pin and side template butt, the side template continues to remove and makes the fixed pin remove, the plug socket is removed and kept away from to the fixed pin, go up the fixed action that folding template lost the fixed pin, under the torsional spring effect, it is folding to go up folding template shrink, when folding assembly drive side template removes and makes the device launch, folding template rotates to the position of launching in the side template promotion, under first answer spring action, the fixed pin pops out and inserts in the plug socket, it is fixed again to go up folding template.

Preferably, the second fixing component comprises a chain and a first clamping block, the chain is fixedly connected to the end portion, close to the lower template, of the lower folding template, the end portion, far away from the lower folding template, of the chain penetrates into the lower template, a third sliding groove for sliding fit of the chain is formed in the lower template, the first clamping block penetrates into the lower template in a sliding manner, a second accommodating groove for sliding fit with the first clamping block is formed in the lower template, the first clamping block penetrates into the third sliding groove, the first clamping block is clamped with the chain, and a second return spring is fixedly connected to the end portion, far away from the chain, of the first clamping block, the end part of the second return spring, far away from the first clamping block, is fixedly connected with the inner end wall of the second accommodating groove, a trigger block penetrates through the lower template in a sliding mode, one end of the trigger block is fixedly connected with the first clamping block, the other end of the trigger block penetrates through the side wall of the lower template and is abutted to the upper folding template, a second clamping block penetrates through the lower template, the second clamping block is clamped with the chain, the trigger block penetrates through the lower template, one end of the trigger block is fixedly connected with the second clamping block, the other end of the trigger block penetrates through the end wall of the lower template and is abutted to the side template, and inclined planes are arranged on the first clamping block, the second clamping block and the trigger block.

By adopting the technical scheme, when the folding assembly drives the side template to move so as to shrink the side template, the side template is sequentially abutted against the first clamping block and the second clamping block, under the combined action of the first clamping block and the second clamping block, the lower folding template cannot be folded under the action of the torsion spring, after the side template moves to the shrinking position, the side template is abutted against the trigger block on the second clamping block, the side template pushes the trigger block to move, the trigger block moves so as to enable the second clamping block to move, the second clamping block moves and is far away from the chain, at the moment, the chain only drags the lower folding template under the fixed action of the first clamping block so as not to rotate, when the side template moves to the shrinking position, the fixed pin moves and is far away from the inserting seat, go up folding template and lose the fixed action of fixed pin, under the torsional spring effect, it is folding to go up folding template shrink, go up folding template folding back and make its removal with the trigger block butt on the first fixture block, first fixture block is followed trigger block removal on it, first fixture block removes and keeps away from the chain, first fixture block and second fixture block all do not contact with the chain this moment, under the torsional spring effect, lower folding template rotates and folds, when folding subassembly drive side template removes and makes the side template expand, side template removes and promotes folding template and lower folding template rotation, when lower folding template rotates, the chain inserts in the third spout and again with first fixture block and second fixture block joint.

The application also provides a construction process of the pier cast-in-place box girder, which adopts the following technical scheme:

s1, performing foundation treatment on a construction site, sequentially performing mud pit treatment, cushion cap foundation pit treatment and foundation leveling treatment in a bridge position range, performing a foundation bearing capacity test when performing the mud pit treatment and the cushion cap foundation pit treatment, and performing light penetration detection on a foundation after the foundation leveling treatment;

s2, building a support, namely building a column-embracing structure by using a coil buckle type steel pipe support and performing hot galvanizing treatment on the support, wherein the support is close to a pier by using a steel pipe, a main keel is arranged perpendicular to a box girder and is arranged above a support top support, and a secondary keel is arranged along the direction of the box girder and is arranged above the main keel;

s3, installing a mold support, and performing support preloading test by using a concrete pre-compaction block according to three levels of 60%, 100% and 110% of the maximum load of the support, wherein the pre-compaction load distribution is basically consistent with the support construction load distribution, and the loading weight deviation is controlled within +/-5% of the loads at the same level;

s4, arranging a bottom die, arranging a main keel and a secondary keel on a nail, installing a top support, then installing a bottom template and an outer side die, binding steel bars on the bottom die and the outer side die, retesting the elevation and the plane position of the template when the bottom template is arranged, and detecting the flatness of the bottom template and the seam of the template;

s5, installing a pier cast-in-place box girder construction device and an end mould, and simultaneously installing a metal corrugated pipe, wherein a positioning reinforcing mesh is arranged when the metal corrugated pipe is installed, and the pier cast-in-place box girder construction device is supported by a fastener type steel pipe scaffold;

and S6, pouring concrete, namely pouring the sub-bottom plate, the web plate and the top plate in sequence according to the height direction of the box girder, pouring concrete in an area (far away from pier supports) with weakest rigidity of the vertical support along the bridge direction, and then pouring concrete in an area (near the pier) with larger rigidity. Pouring concrete from the downhill end to the uphill end;

s7, performing prestressed engineering construction after the concrete is solidified, performing pre-tensioning, initial tensioning and final tensioning, sealing anchors and grouting pore canals after the prestressed construction is completed, and sealing anchors of the openings of the tensioning ends of the prestressed tendons;

and S8, unloading the disc buckle type support according to a program, and sequentially dismantling the support from top to bottom according to the principle of full-hole multipoint, symmetry, slowness and uniformity and the symmetry from the midspan to the fulcrums at the two ends step by step.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by arranging the folding assembly, an operator can be helped to store the side formwork when the side formwork is detached, so that the aim of rapidly detaching the formwork is fulfilled;

2. by arranging the first fixing assembly and the second fixing assembly, the stability of the upper folding template and the lower folding template is improved when the device is unfolded, and the device can help operators to rapidly demold the die when the device is dismounted;

3. through setting up connecting screw, under connecting screw's effect, even the length of first mount pad receives the restriction, connecting screw also can promote the side template to farther distance, further improves the folding ability of device, reduces the volume after the device is folding.

Drawings

Fig. 1 is a schematic structural view of a cast-in-place pier beam construction device and a construction process according to an embodiment of the application.

Fig. 2 is a schematic structural diagram of a folding assembly according to an embodiment of the present application.

Fig. 3 is a schematic diagram of the structure at a in fig. 2.

Fig. 4 is a schematic structural view of an auxiliary sheave according to an embodiment of the present application.

Fig. 5 is a schematic view of the structure at B in fig. 4.

Fig. 6 is a schematic view of the structure at C in fig. 4.

Description of reference numerals:

1. mounting a template; 11. an upper folding template; 12. side template; 13. a movable sleeve; 14. driving the screw rod; 2. a lower template; 21. a lower folding template; 22. a motor; 23. a pulley; 24. a drive belt; 3. a folding assembly; 31. a first mounting seat; 32. connecting a screw rod; 33. an auxiliary pulley; 331. a first chute; 332. a second chute; 34. a drive sleeve; 341. a first accommodating groove; 4. a fourth drive assembly; 41. a first straight gear; 42. a crown gear; 43. rotating the column; 5. a first stationary component; 51. a fixing pin; 52. a socket; 53. a first return spring; 6. a second stationary component; 61. a chain; 611. a third chute; 62. a first clamping block; 621. a second accommodating groove; 63. a second fixture block; 64. and triggering the block.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses cast-in-place box girder construction equipment of pier. Referring to fig. 1, the cast-in-place pier box girder construction device comprises an upper template 1 and a lower template 2.

Referring to fig. 1 and 2, both the upper template 1 and the lower template 2 are horizontally disposed, and the upper template 1 is located above the lower template 2. Two ends of the upper template 1 are hinged with two upper folding templates 11, the two upper folding templates 11 are symmetrically arranged along the axis of the upper template 1.

Referring to fig. 1 and 2, two ends of the lower template 2 are hinged with two lower folding templates 21, and the two lower folding templates 21 are symmetrically arranged along the axis of the lower template 2. The hinge joint of the upper template 1 and the upper folding template 11 is provided with a torsion spring, and the hinge joint of the lower template 2 and the lower folding template 21 is provided with a torsion spring. The end portions of the two lower folding templates 21 that are far away from each other are provided with inclined surfaces, and the end portions of the two upper folding templates 11 that are far away from each other are also provided with inclined surfaces.

Referring to fig. 1 and 2, two side templates 12 are arranged between the upper template 1 and the lower template 2, and the two side templates 12 are symmetrically arranged along the axial direction of the upper template 1. The side template 12 is vertical, and the top and the bottom of side template 12 all are provided with the inclined plane.

Referring to fig. 1 and 2, a plurality of rotating columns 43 are disposed between the upper template 1 and the lower template 2, four rotating columns 43 are disposed, and the four rotating columns 43 are symmetrically disposed. The rotating column 43 is vertically arranged, the top end of the rotating column 43 is fixedly connected with the bottom surface of the upper template 1, and the bottom end of the rotating column 43 is fixedly connected with the top surface of the lower template 2.

Referring to fig. 2 and 3, the upper plate 1 is provided with a first fixing assembly 5, and the first fixing assembly 5 includes a fixing pin 51 and a socket 52. A third accommodating groove is formed in the end part, close to the upper folding template 11, of the upper template 1, and the cross section of the third accommodating groove is rectangular. The fixing pins 51 are arranged in the third accommodating groove, the fixing pins 51 penetrate through the end walls of the third accommodating groove and penetrate into the upper folding template 11, the fixing pins 51 are matched with the upper template 1 in a sliding mode, the number of the fixing pins 51 is two, and the fixing pins 51 correspond to the upper folding template 11 one to one.

Referring to fig. 2 and 3, the socket 52 is disposed in the upper folding template 11, the fixing pin 51 penetrates the end of the upper folding template 11 and passes through the socket 52, and the fixing pin 51 is in plugging fit with the socket 52. The end part of the fixing pin 51 far away from the socket 52 is fixedly connected with a first return spring 53, the end part of the first return spring 53 far away from the fixing pin 51 is fixedly connected with the inner end wall of the third accommodating groove, the fixing pin 51 corresponds to the socket 52 one by one, and the end part of the fixing pin 51 near the first return spring 53 can be abutted against the side formwork 12.

Referring to fig. 2 and 4, a folding assembly 3 is disposed on the lower template 2, and the folding assembly 3 includes a first mounting seat 31 and a connecting screw rod 32. The first mounting seat 31 is sleeved on the rotary column 43, the first mounting seat 31 is rotatably connected with the rotary column 43, and the first mounting seat 31 corresponds to the rotary column 43 one to one. Connecting screw 32 wears to locate on first mount pad 31, and connecting screw 32 keeps away from the tip of first mount pad 31 and penetrates in side template 12, and single side template 12 corresponds two connecting screw 32, and two connecting screw 32 symmetries on the single side template 12 set up.

Referring to fig. 2 and 4, the side formwork 12 is provided with a first sliding groove 331 along the length direction thereof, an end portion of the connecting screw rod 32 far away from the first mounting seat 31 penetrates into the first sliding groove 331, and the connecting screw rod 32 is in sliding fit with an inner side wall of the first sliding groove 331. The end portion of the connecting screw rod 32 located in the first sliding groove 331 is fixedly connected with an auxiliary pulley 33, the auxiliary pulley 33 is in sliding fit with the inner side wall of the first sliding groove 331, and the connecting screw rod 32 corresponds to the auxiliary pulleys 33 one to one.

Referring to fig. 2 and 4, the first mounting seat 31 is provided with a first driving assembly, and the first driving assembly includes a movable sleeve 13 and a driving screw 14. Activity sleeve 13 sets up on first mount pad 31, and activity sleeve 13 and first mount pad 31 sliding connection, and second spout 332 has been seted up along its length direction to first mount pad 31, and activity sleeve 13 and the cooperation of sliding of second spout 332 inside wall, activity sleeve 13 and first mount pad 31 one-to-one.

Referring to fig. 2 and 4, the two driving screw rods 14 are rotatably mounted on the lower template 2, and the two driving screw rods 14 are symmetrically arranged along the axis of the upper template 1. A single driving screw 14 passes through the two movable sleeves 13 on the same side, and the driving screw 14 is in threaded fit with the movable sleeves 13.

Referring to fig. 2 and 4, a third driving assembly is disposed on the lower template 2, and includes a motor 22 and a pulley 23. The motor 22 is fixedly connected to the top surface of the lower template 2, the number of the belt pulleys 23 is three, two belt pulleys 23 are fixedly sleeved on the end portions, close to the motor 22, of the two driving screw rods 14, the third belt pulley 23 is fixedly sleeved on the output end of the motor 22, and the belt pulleys 23 are wound with the transmission belt 24.

Referring to fig. 4 and 5, a second driving assembly is disposed on the first mounting seat 31, and the second driving assembly includes a driving sleeve 34. The driving sleeve 34 is rotatably installed in the first installation seat 31, the first installation seat 31 has a first receiving groove 341 along the length direction thereof, and the driving sleeve 34 is slidably fitted with the inner side wall of the first receiving groove 341. The driving sleeve 34 is sleeved on the end portion of the connecting screw rod 32 located in the first mounting seat 31, the driving sleeve 34 is in threaded fit with the connecting screw rod 32, and the driving sleeve 34 corresponds to the connecting screw rod 32 one to one.

Referring to fig. 4 and 5, the fourth drive unit 4 is provided on the first mount 31, and the fourth drive unit 4 includes a first straight gear 41 and a crown gear 42. The rotating column 43 passes through the first receiving groove 341, the first straight gear 41 is fixedly sleeved on the end portion of the rotating column 43 located in the first receiving groove 341, the crown gear 42 is fixedly sleeved on the end portion of the driving sleeve 34 far away from the connecting screw rod 32, and the first straight gear 41 and the crown gear 42 are engaged with each other.

Referring to fig. 4 and 6, a second fixing assembly 6 is disposed in the lower mold plate 2, and the second fixing assembly 6 includes a chain 61 and a first block 62. The chain 61 is fixedly connected to the side wall of the lower folding template 21 close to the lower template 2, the end part of the chain 61 far away from the lower folding template 21 penetrates into the lower template 2, and the chain 61 corresponds to the lower folding template 21 one by one. Two third chutes 611 are formed in the lower template 2 along the width direction of the lower template, the chain 61 penetrates into the third chutes 611, and the chain 61 is in sliding fit with the inner side wall of the third chute 611.

Referring to fig. 4 and 6, the first block 62 is vertically disposed in the lower mold plate 2, the first block 62 is connected with the chain 61 in a clamping manner, and the first blocks 62 correspond to the chain 61 one to one. Second holding tank 621 is seted up in lower bolster 2, and second holding tank 621 is linked together with third spout 611, and first fixture block 62 and second holding tank 621 inside wall sliding fit.

Referring to fig. 4 and 6, a second fixture block 63 vertically penetrates through the lower template 2, the second fixture block 63 is in sliding fit with the inner side wall of the second accommodating groove 621, the second fixture block 63 is clamped with the chain 61, and inclined surfaces are arranged at the end portions, close to the chain 61, of the first fixture block 62 and the second fixture block 63. The bottom surfaces of the first latch 62 and the second latch 63 are both fixedly connected with a second return spring, and the end part of the second return spring far away from the first latch 62 and the second latch 63 is fixedly connected with the inner end wall of the second accommodating groove 621.

Referring to fig. 4 and 6, the side walls of the first fixture block 62 and the second fixture block 63 are fixedly connected with a trigger block 64, the end portions, far away from the first fixture block 62 and the second fixture block 63, of the trigger block 64 penetrate through the top surface of the lower template 2, the trigger block 64 is in sliding fit with the lower template 2, and the top end of the trigger block 64 is provided with an inclined surface. The trigger block 64 of the first latch 62 can abut against the upper folding template 11, and the trigger block 64 of the second latch 63 abuts against the side template 12.

The implementation principle of the pier cast-in-place box girder construction device and the construction process provided by the embodiment of the application is as follows: when the side formwork 12 contracts or expands, the motor 22 is started, the motor 22 drives the belt pulley 23 to rotate, the belt pulley 23 on the motor 22 rotates through the transmission belt 24, the belt pulley 23 on the driving screw 14 rotates, the driving screw 14 rotates to enable the movable sleeve 13 to move, the movable sleeve 13 moves to enable the movable sleeve 13 to slide in the second sliding groove 332 and pull the first mounting seat 31 to rotate, the first mounting seat 31 rotates to enable the first mounting seat 31 to pull the connecting screw 32 to move, and the connecting screw 32 moves to enable the side formwork 12 to move, so that the side formwork 12 contracts or expands.

When folding assembly 3 drive side template 12 removes and makes the device contract, when side template 12 is about to remove the shrink position, fixed pin 51 and side template 12 butt, side template 12 continues to remove and makes fixed pin 51 remove, fixed pin 51 removes and keeps away from bayonet socket 52, go up folding template 11 and lose the fixed action of fixed pin 51, under the torsional spring effect, it is folding to go up folding template 11 shrink, when folding assembly 3 drive side template 12 removes and makes the device expand, side template 12 promotes folding template 11 and rotates to the position of expanding, under the effect of first recoil spring 53, fixed pin 51 pops out and inserts in the bayonet socket 52, will go up folding template 11 and fix again.

When the folding assembly 3 drives the side template 12 to move so that the side template 12 contracts, the side template 12 is sequentially abutted against a first clamping block 62 and a second clamping block 63, under the combined action of the first clamping block 62 and the second clamping block 63, the lower folding template 21 cannot be folded under the action of a torsion spring, after the side template 12 moves to the contracted position, the side template 12 is abutted against a triggering block 64 on the second clamping block 63, the side template 12 pushes the triggering block 64 to move, the triggering block 64 moves so that the second clamping block 63 moves, the second clamping block 63 moves and is far away from the chain 61, at the moment, the chain 61 only pulls the lower folding template 21 under the fixing action of the first clamping block 62 so that the lower folding template does not rotate, when the side template 12 moves to the contracted position, the fixing pin 51 moves and is far away from the socket 52, the upper folding template 11 loses the fixing action of the fixing pin 51, under the action of the torsion spring, the upper folding template 11 contracts and folds, after folding, the upper folding template 11 is abutted against the triggering block 64 on the first clamping block 62 and moves so that the lower folding template 21 and the lower folding template 21 rotates, when the first clamping block 62 and the folding template 12 moves, the lower folding template 21 and the folding template 12 moves, the folding template and the folding template moves, when the side template 12 and the side template moves, the folding template and the folding template moves again, the folding template 12 and the folding template, the folding template moves, and the lower folding template, and the folding template 12 moves, and the folding template rotates; through setting up folding assembly 3, first fixed subassembly 5 and the fixed subassembly 6 of second, can help operating personnel to expand the device fast, after concrete forming, help operating personnel to demolish the device fast, improve work efficiency, reduce the potential safety hazard.

The embodiment of the application also discloses a construction process of the pier cast-in-place box girder. The construction process of the pier cast-in-place box girder comprises the following steps:

s1, performing foundation treatment on a construction site, sequentially performing mud pit treatment, cushion cap foundation pit treatment and foundation leveling treatment in a bridge site range, performing a foundation bearing capacity test during the mud pit treatment and the cushion cap foundation pit treatment, and performing light penetration detection on a foundation after the foundation leveling treatment;

s2, building a support, namely building a column-embracing structure by using a coil buckle type steel pipe support and performing hot galvanizing treatment on the support, wherein the support is close to a pier by using a steel pipe, a main keel is arranged perpendicular to a box girder and is arranged above a support top support, and a secondary keel is arranged along the direction of the box girder and is arranged above the main keel;

s3, installing a mold support, and performing support preloading test by using a concrete preloading block according to three levels of 60%, 100% and 110% of the maximum load of the support, wherein the preloading load distribution is basically consistent with the support construction load distribution, and the loading weight deviation is controlled within +/-5% of the loads at the same level;

s4, arranging a bottom die, arranging a main keel and a secondary keel on a nail, installing a top support, then installing a bottom template and an outer side die, binding steel bars on the bottom die and the outer side die, retesting the elevation and the plane position of the template when the bottom template is arranged, and detecting the flatness of the bottom template and the seam of the template;

s5, installing a pier cast-in-place box girder construction device and an end mould, and simultaneously installing a metal corrugated pipe, wherein a positioning reinforcing mesh is arranged when the metal corrugated pipe is installed, and the pier cast-in-place box girder construction device is supported by a fastener type steel pipe scaffold;

and S6, pouring concrete, namely pouring the sub-bottom plate, the web plate and the top plate in sequence according to the height direction of the box girder, pouring concrete in an area (far away from pier supports) with weakest rigidity of the vertical support along the bridge direction, and then pouring concrete in an area (near the pier) with larger rigidity. Pouring concrete from the downhill end to the uphill end;

s7, performing prestressed engineering construction after the concrete is solidified, performing pre-tensioning, initial tensioning and final tensioning, sealing anchors and grouting pore canals after the prestressed construction is completed, and sealing anchors of the openings of the tensioning ends of the prestressed tendons;

and S8, unloading the disc buckle type support according to a program, and sequentially dismantling the support from top to bottom according to the principle of full-hole multipoint, symmetry, slowness and uniformity and the symmetry from the midspan to the fulcrums at the two ends step by step.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (9)

1. Cast-in-place case roof beam construction equipment of pier, its characterized in that: including cope match-plate pattern (1) and lower bolster (2), articulated on cope match-plate pattern (1) have folding template (11), go up folding template (11) with the articulated department of cope match-plate pattern (1) is provided with the torsional spring, articulated on lower bolster (2) have folding template (21) down, folding template (21) down with the articulated department of lower bolster (2) also is provided with the torsional spring, it is provided with side template (12) to slide on lower bolster (2), be used for the drive on lower bolster (2) folding component (3) that side template (12) removed, be provided with on cope match-plate pattern (1) and be used for fixing first fixed subassembly (5) of going up folding template (11), be provided with on lower bolster (2) and be used for fixing the fixed subassembly (6) of second of folding template (21) down.

2. The pier cast-in-place box girder construction device according to claim 1, wherein: folding assembly (3) include first mount pad (31) and connecting screw (32), first mount pad (31) rotate install in on lower bolster (2), connecting screw (32) penetrate in first mount pad (31), connecting screw (32) are kept away from the tip of first mount pad (31) penetrates in side template (12), connecting screw (32) with side template (12) sliding connection, connecting screw (32) are located tip in side template (12) is provided with auxiliary pulley (33), seted up in side template (12) be used for with auxiliary pulley (33) sliding fit's first spout (331), be provided with on lower bolster (2) and be used for the drive first drive assembly of first mount pad (31) pivoted, be provided with on first mount pad (31) and be used for the drive connect the second drive assembly that screw (32) removed.

3. The pier cast-in-place box girder construction device according to claim 2, wherein: the first driving assembly comprises a movable sleeve (13) and a driving screw rod (14), the movable sleeve (13) is arranged on the first mounting seat (31) in a sliding mode, a second sliding groove (332) matched with the movable sleeve (13) in a sliding mode is formed in the first mounting seat (31), the driving screw rod (14) is rotatably installed on the lower template (2), the driving screw rod (14) penetrates through the movable sleeve (13), the driving screw rod (14) is in threaded fit with the movable sleeve (13), and a third driving assembly used for driving the driving screw rod (14) to rotate is arranged on the lower template (2).

4. The pier cast-in-place box girder construction device according to claim 3, wherein: the third drive assembly includes motor (22) and belt pulley (23), motor (22) set up in on lower bolster (2), motor (22) output and all fixed the cover is equipped with belt pulley (23) on drive lead screw (14), around being equipped with driving belt (24) on belt pulley (23).

5. The cast-in-place pier box beam construction device according to claim 2, characterized in that: the second drive assembly comprises a drive sleeve (34), the drive sleeve (34) is rotatably installed in the first installation seat (31), a first accommodating groove (341) which is matched with the drive sleeve (34) in a sliding mode is formed in the first installation seat (31), the drive sleeve (34) is sleeved on the connecting screw rod (32) which is located at the end part of the first installation seat (31), the drive sleeve (34) is matched with the connecting screw rod (32) in a threaded mode, and a fourth drive assembly (4) which is used for driving the drive sleeve (34) to rotate is arranged on the first installation seat (31).

6. The pier cast-in-place box girder construction device according to claim 5, wherein: fourth drive assembly (4) include first straight gear (41) and crown gear (42), wear to be equipped with column spinner (43) in first mount pad (31), column spinner (43) penetrate first holding tank (341) and pass first mount pad (31), column spinner (43) with first mount pad (31) rotate to be connected, column spinner (43) one end with cope match-plate pattern (1) rotates to be connected, column spinner (43) the other end with lower bolster (2) rotate to be connected, first straight gear (41) fixed cover is located column spinner (43) are located on the tip in first holding tank (341), crown gear (42) fixed cover is located on driving sleeve (34), first straight gear (41) with crown gear (42) intermeshing.

7. The cast-in-place pier box beam construction device according to claim 1, characterized in that: first fixed subassembly (5) include fixed pin (51) and bayonet socket (52), fixed pin (51) slide to wear to locate on cope match-plate pattern (1), bayonet socket (52) set up in go up folding template (11) and be close to on the end wall of cope match-plate pattern (1), fixed pin (51) with bayonet socket (52) grafting cooperation, fixed pin (51) are kept away from first return spring (53) of fixedly connected with on the tip of bayonet socket (52), first return spring (53) are kept away from the tip of fixed pin (51) with cope match-plate pattern (1) fixed connection, fixed pin (51) with side template (12) butt.

8. The cast-in-place pier box beam construction device according to claim 1, characterized in that: the second fixing component (6) comprises a chain (61) and a first fixture block (62), the chain (61) is fixedly connected to the end portion, close to the lower template (2), of the lower folding template (21), the end portion, far away from the lower folding template (21), of the chain (61) penetrates into the lower template (2), a third sliding groove (611) used for sliding fit of the chain (61) is formed in the lower template (2), the first fixture block (62) penetrates into the lower template (2) in a sliding mode, a second accommodating groove (621) used for sliding fit with the first fixture block (62) is formed in the lower template (2), the first fixture block (62) penetrates into the third sliding groove (611), the first fixture block (62) is clamped with the chain (61), the end portion, far away from the chain (61), of the first fixture block (62) is fixedly connected with a second return spring, the end portion, far away from the first fixture block (62), of the second return spring is fixedly connected with the inner end portion of the lower template (64), the inner end portion of the lower template (64) penetrates through the triggering block (64), and the other end portion of the lower template (11) is connected with the triggering block (64), wear to be equipped with second fixture block (63) in lower bolster (2), second fixture block (63) with chain (61) joint, wear to be equipped with another on lower bolster (2) trigger block (64), another trigger block (64) one end with second fixture block (63) fixed connection, another trigger block (64) other end passes lower bolster (2) end wall with side template (12) butt, first fixture block (62), second fixture block (63) and all be provided with the inclined plane on triggering block (64).

9. The construction process of the cast-in-situ pier box beam is based on the construction device of the cast-in-situ pier box beam of claims 1 to 8, and is characterized in that: comprises the following steps:

s1, performing foundation treatment on a construction site, and sequentially performing mud pit treatment, bearing platform foundation pit treatment and foundation leveling treatment within a bridge position range;

s2, building a support, namely adopting a coil buckle type steel pipe support and performing hot galvanizing treatment on the steel pipe support, and building a column-clasping structure by using a steel pipe at the position of the support close to the pier;

s3, installing a mold support, and performing support prepressing test by using the concrete prepressing block;

s4, arranging a bottom die, arranging a main keel and a secondary keel on a nail, installing a top support, then installing a bottom template and an outer side die, and simultaneously binding reinforcing steel bars on the bottom die and the outer side die;

s5, installing a pier cast-in-place box girder construction device and an end mould, and installing a metal corrugated pipe at the same time, wherein a positioning reinforcing mesh is arranged when the metal corrugated pipe is installed;

s6, pouring concrete, and sequentially pouring the sub-bottom plate, the web plate and the top plate according to the height direction of the box girder;

s7, after the concrete is solidified, performing prestress engineering construction according to three stages of pre-tensioning, initial tensioning and final tensioning, after the prestress construction is finished, performing anchor sealing and pore grouting, and meanwhile performing anchor sealing on a prestressed tendon tensioning end notch;

s8, sequentially removing the supports from top to bottom, wherein the supports are symmetrical from midspan to side span and from midspan to two end fulcrums step by step.

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