CN112757474A - Method for prefabricating hollow pier stud by integrally overturning inner mold, outer mold and reinforcement cage - Google Patents

Method for prefabricating hollow pier stud by integrally overturning inner mold, outer mold and reinforcement cage Download PDF

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Publication number
CN112757474A
CN112757474A CN202011618945.1A CN202011618945A CN112757474A CN 112757474 A CN112757474 A CN 112757474A CN 202011618945 A CN202011618945 A CN 202011618945A CN 112757474 A CN112757474 A CN 112757474A
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CN
China
Prior art keywords
reinforcement cage
mold
die
support
pier stud
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Pending
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CN202011618945.1A
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Chinese (zh)
Inventor
蒋平文
辜天天
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China Railway Wuxin Steel Formwork Co Ltd
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China Railway Wuxin Steel Formwork Co Ltd
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Filing date
Publication date
Application filed by China Railway Wuxin Steel Formwork Co Ltd filed Critical China Railway Wuxin Steel Formwork Co Ltd
Priority to CN202011618945.1A priority Critical patent/CN112757474A/en
Publication of CN112757474A publication Critical patent/CN112757474A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00Moulds; Cores; Mandrels
    • B28B7/16Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
    • B28B7/18Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes the holes passing completely through the article
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00Moulds; Cores; Mandrels
    • B28B7/28Cores; Mandrels

Abstract

The invention discloses a method for prefabricating a hollow pier stud by integrally turning an inner mold, an outer mold and a reinforcement cage, wherein the outer mold which is laid horizontally is divided into an upper part and a lower part along the circumferential direction, the formed reinforcement cage is horizontally placed on a reinforcement cage storage bracket, the inner mold is horizontally placed on the inner mold storage bracket after being assembled, then the inner mold is horizontally pulled into the reinforcement cage, a bottom mold, the inner mold and the reinforcement cage are fixed to form a horizontal integral piece, the integral piece is assembled with the outer mold in a horizontal state and is fixed with a turning frame, and finally, a template and the reinforcement cage are integrally turned to a vertical state through the turning frame to perform pier stud prefabrication. The template assembly, the template working surface treatment, the adjustment of the position of the steel reinforcement cage in the inner mold, and the work of fixing the embedded part and the corrugated pipe on the steel reinforcement cage are all carried out on the ground, the operation is convenient, fast and efficient, the operation of all links can be guaranteed to meet the design requirements, the safety hidden danger of high-altitude operation is avoided, and the method is particularly suitable for the hollow pier column prefabricating construction operation with heavy weight and higher pier height.

Description

Method for prefabricating hollow pier stud by integrally overturning inner mold, outer mold and reinforcement cage
Technical Field
The invention relates to a construction method for prefabricating a hollow pier stud, in particular to a method for prefabricating the hollow pier stud by integrally turning an inner die and an outer die.
Background
The hollow pier stud has the advantages of good structural rigidity and strength, light dead weight, large section modulus and small section area, and is widely applied to railway and highway bridges. The construction process of the hollow pier stud is complex, and particularly when the construction mode with extremely high precision requirement on the finished pier stud is adopted, the process difficulty is obviously and greatly increased.
At present, the common prefabrication construction methods of the hollow pier stud comprise the following two methods:
one is a centrifugal molding method. The pier stud is rotationally molded on centrifugal equipment, and a template does not need to be installed inside the pier stud. However, this construction method is only suitable for prefabricating a pier stud with a small cross section and light weight. The hollow pier stud applied to the bridge usually has a large section size, and the centrifugal forming method cannot meet the construction requirements of the hollow pier stud.
One is a method similar to the cast-in-place construction of a pier stud. The pier stud external mold is vertically installed, then the reinforcement cage is hung into the external mold, and finally the internal mold is hung into the reinforcement cage in small pieces and is assembled into a whole in the reinforcement cage. Although the method can realize the prefabrication construction of the hollow pier stud with larger section size, the gantry crane occupies long time, most operations in the construction process are high-altitude operation, the potential safety hazard is large, the inner cavity of the hollow pier stud is narrow, the operation difficulty of assembling the inner die in the cavity by workers is large, the efficiency is very low, and the splicing quality of the working face of the inner die is difficult to detect due to the influence of the operation space because the inner die is assembled in the reinforcement cage.
Disclosure of Invention
The invention mainly aims to provide a method for prefabricating hollow pier stud by integrally turning an inner die, an outer die and a reinforcement cage, which can avoid high-altitude operation, improve the safety of template assembly construction and the construction efficiency and ensure the splicing quality of the working surface of the inner die.
The method for prefabricating the hollow pier stud by integrally turning the inner mold, the outer mold and the reinforcement cage comprises the steps of dividing the outer mold which is horizontally placed into an upper part and a lower part along the circumferential direction, horizontally placing the formed reinforcement cage on a reinforcement cage storage bracket, horizontally placing the assembled inner mold on the inner mold storage bracket, horizontally drawing the inner mold into the reinforcement cage, fixing a bottom mold, the inner mold and the reinforcement cage to form a horizontal integral piece, assembling the integral piece with the outer mold in a horizontal state and fixing the integral piece with a turning frame, and finally turning the integral piece of the template and the reinforcement cage to a vertical state through the turning frame to perform pier stud prefabrication.
In one embodiment of the above method, the steel reinforcement cage storage support comprises a support body and movable support rollers which are connected to the tops of two sides of the support body and can stretch up and down, the movable support rollers can stretch out and draw back between the hoop gaps of the steel reinforcement cage and can rotate along the longitudinal direction of the support body, the initial state of the movable support rollers is a retraction state and does not interfere with the horizontal placement of the steel reinforcement cage, and the support inner die slides into the steel reinforcement cage when the movable support rollers extend out.
In one embodiment of the above method, when the inner mold is horizontally assembled, the traction end is connected with a guide cone with a small front end and a large rear end, the diameter of the rear end of the guide cone is the same as the outer diameter of the inner mold, the two sides of the upper end of the inner mold storage support are provided with support rollers, and the rotation direction of the support rollers is the longitudinal direction of the inner mold storage support.
In one embodiment of the method, the roll-over stand comprises a fixed support body and a plurality of pad beams rotatably hinged to one end of the fixed support body, a jacking device is detachably connected between the pad beams and the fixed support body, a bracket is arranged at the bottom of the outer wall of each pad beam, and when the pad beams are jacked to be in a vertical state, a bottom die assembled with the inner die and the reinforcement cage is arranged on the bracket and connected with the pad beams through fasteners.
The method comprises the following steps:
(1) arranging and fixing the steel reinforcement cage storage bracket and the internal mold storage bracket on the ground left and right, wherein the width direction central planes of the two brackets are coplanar;
(2) adjusting a movable supporting roller on the reinforcement cage storage bracket to a retraction state, and hoisting the formed reinforcement cage to the reinforcement cage storage bracket;
(3) assembling the inner die, connecting a guide cone at one end of the inner die, and hoisting the integral inner die component to a support roller of the inner die storage bracket;
(4) adjusting a movable support roller on the steel reinforcement cage storage bracket to be in an extending state, so that the movable support roller is flush with a support roller on the internal mold storage bracket;
(5) drawing the guide cone to enable the inner die to slide into the reinforcement cage;
(6) removing the guide cone, connecting and fixing the bottom die and the end of the inner die through a fastener, and fixing the bottom die and the reinforcement cage;
(7) retracting the movable support rollers on the steel reinforcement cage storage bracket, and fixing the hanger, the bottom die and the steel reinforcement cage for ready hoisting;
(8) external mold hoisting and roll-over stand in place
The turnover frame and the outer mold support are arranged and fixed on the ground left and right, the lower half outer mold is hoisted to the outer mold support, and the pad beam of the turnover frame is turned to be in a vertical state;
(9) hoisting the bottom die, the inner die and the reinforcement cage integral piece to the lower half outer die by the hoisting frame, supporting the bottom die on a bracket at the bottom of the outer side of the pad beam, and fixing the bottom die and the pad beam by a fastener;
(10) after the hanging frame is disassembled, the upper half outer mold is installed and fixed with the bottom mold, and thus the bottom mold, the inner mold, the reinforcement cage and the outer mold are assembled into an integral piece;
(11) a positioning frame is arranged on the top of the outer mold, and an inner liner tube is inserted into the corrugated tube, so that the inner mold and the corrugated tube are accurately positioned;
(12) removing the jacking device of the roll-over stand, and hoisting one end of the assembled integral piece away from the roll-over stand to enable the integral piece to be turned over to a vertical state along with the pad beam;
(13) removing a fastener between the bottom die and the pad beam, hoisting the whole piece onto a bottom die support, and connecting and fixing the bottom die and the bottom die support through the fastener;
(14) installing an operation platform on the top of the outer mold;
(15) pouring concrete to form the pier stud, maintaining to a specified strength, then drawing out the lining pipe of the corrugated pipe, and removing the positioning frame;
(16) the inner die is folded and then is lifted out of the inner cavity of the pier stud;
(17) the operation platform and the outer die are successively dismantled, and the pier stud is exposed;
(18) and (4) continuing maintaining the pier stud, hoisting the pier stud to a storage area after maintaining is finished, and reserving the bottom die on the bottom die support for recycling.
The template assembly, the template working surface treatment, the position adjustment of the reinforcement cage in the inner mold, the fixation of the embedded part on the reinforcement cage and the corrugated pipe are all carried out on the ground, the operation is convenient and quick, and the operation of all links can meet the design requirement. Specifically, the inner die and the reinforcement cage are horizontally assembled, the bottom die, the inner die and the reinforcement cage are horizontally assembled, the whole bottom die, the inner die and the reinforcement cage is horizontally assembled with the outer die, and finally the assembled whole is turned to be in a vertical state through the turning frame at one time, so that concrete pouring of the pier stud can be performed, high-altitude operation of template assembly is completely avoided, operation of hanging the reinforcement cage into the template at high altitude is avoided, potential safety hazards of the high-altitude operation are avoided, and quality and high efficiency of ground operation can be guaranteed. The method is particularly suitable for the prefabrication construction operation of the hollow pier stud with heavy weight and higher pier height.
Drawings
Fig. 1 is a schematic layout view of two reinforcement cage storage racks and an inner mold storage rack according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a reinforcement cage placed on a reinforcement cage storage bracket and an inner mold placed on an inner mold storage bracket.
Fig. 3 is a schematic diagram showing a state of the reinforcement cage storage bracket before the inner mold slides into the reinforcement cage.
Fig. 4 is a schematic diagram of the inner form after sliding into the reinforcement cage.
Fig. 5 is a schematic diagram of the bottom die and the corrugated pipe plug after being connected with the inner die and the corrugated pipe in the reinforcement cage.
Fig. 6 is a schematic diagram of the hanger, the bottom die and the reinforcement cage being fixed and ready for hoisting.
Fig. 7 is a schematic layout of the outer mold bracket and the roll-over stand.
Fig. 8 is a schematic view of the lower mold half placed on the outer mold support.
Fig. 9 is a schematic view of the hanger hoisting bottom die, the inner die and the reinforcement cage integral piece entering the lower half outer die.
Fig. 10 is a schematic diagram of the upper half outer mold and the lower half outer mold after being assembled.
FIG. 11 is a schematic view of the positioning frame installed on the top of the outer mold and the corrugated pipe in the reinforcement cage inserted into the inner lining pipe.
Fig. 12 is a schematic view of the formwork and the reinforcement cage in an overall inverted state.
Fig. 13 is a schematic view of the formwork and the reinforcement cage being turned over to a vertical position.
Fig. 14 is a schematic view of the mold plate standing on the bottom mold support.
FIG. 15 is a schematic view of the top of the form after installation of the work platform.
Fig. 16 is a schematic sectional view of a concrete cast state.
FIG. 17 is a schematic cross-sectional view of the positioning frame and the corrugated liner tube after the positioning frame and the corrugated liner tube are removed after the casting process is completed.
Fig. 18 is a schematic diagram of inner mold stripping.
Fig. 19 is a schematic view of the operation platform removed.
FIG. 20 is a schematic drawing of the demolding of the outer mold.
Fig. 21 is a schematic cross-sectional view of the demolded pier.
Detailed Description
The invention discloses a method for prefabricating a hollow pier stud by integrally turning an inner mold, an outer mold and a reinforcement cage, wherein the outer mold is divided into two parts which are symmetrical up and down; the method comprises the steps of horizontally placing a formed steel reinforcement cage on a steel reinforcement cage storage support, horizontally placing an assembled inner mold on the inner mold storage support, horizontally drawing the inner mold into the steel reinforcement cage, fixing a bottom mold, the inner mold and the steel reinforcement cage to form a horizontal integral piece, assembling the integral piece with the outer mold in a horizontal state and fixing the integral piece with a turnover frame, and finally, integrally turning a template and the steel reinforcement cage to a vertical state through the turnover frame and then prefabricating pier columns.
The following describes the complete equipment and detailed construction process required by the present invention by taking the prefabrication of the circular hollow pier stud as an example.
The complete equipment that this embodiment needs to use includes that the support is deposited to the steel reinforcement cage 1, centre form deposit support 2, guide cone 3, gallows 4, the support is deposited to the external mold 5, roll-over stand 6, locating rack 7, die block support 8 and operation platform 9.
The concrete construction steps are as follows:
(1) the steel reinforcement cage storage support 1 and the internal mold storage support 2 are arranged left and right and fixed on the ground, and the width direction central planes of the two supports are coplanar.
As shown in fig. 1, the storage rack 1 for the reinforcement cage comprises a rack body 11 and movable support rollers 12 connected with the two longitudinal ends of the rack body, the rack body has the same structure as a conventional storage rack for the reinforcement cage, the two longitudinal ends of the rack body are symmetrically connected with vertical sleeves, the lower side of a support seat of each movable support roller 12 is connected with an adjusting pipe 13, and the adjusting pipe 13 and the vertical sleeves are fixed through a horizontal pin shaft. The inner mold storage rack 2 includes a rack body 21 and support rollers 22 at both longitudinal sides of the upper end thereof.
(2) The movable supporting rollers 12 on the reinforcement cage storage bracket 1 are adjusted to be in a retraction state, and the formed reinforcement cage GJL is horizontally hoisted to the reinforcement cage storage bracket 1, as shown in fig. 2, a corrugated pipe BWG is fixed in the reinforcement cage. When the reinforcement cage is positioned on the reinforcement cage storage support, the movable support rollers are enabled to correspond to the stirrups of the reinforcement cage.
(3) Centre form NM is assembled and is connected the guide cone 3 as the end of pulling in one end, and deposit support 2 to the centre form with centre form NM hoist and mount, support through supporting roll 22. As shown in fig. 2, the guide cone 3 has a large diameter end having the same diameter as that of the inner die NM, the large diameter end being connected to the inner die NM, and a small diameter end facing the reinforcement cage GJL.
The guide cone 3 plays a role of guiding when the inner die NM slides into the reinforcement cage GJL, and can avoid collision between the inner die NM and the reinforcement cage GJL.
(4) The movable support rollers 12 on the storage rack 1 are adjusted to be in an extended state, so that the support rollers are as high as the support rollers 22 on the internal mold storage rack 2, as shown in fig. 3.
(5) The inner form NM is slid into the reinforcement cage GJL by external traction, as shown in fig. 4, and the movable support rollers 12 on the reinforcement cage storage rack 1 support the inner form NM.
(6) The guide cone 3 is removed, then the bottom die DM and the inner die NM are fixedly connected through bolts, and the plug on the bottom die DM is inserted into the corrugated pipe BWG in the reinforcement cage GJL, so that the bottom die, the inner die and the reinforcement cage form an integral piece, as shown in fig. 5.
(7) The movable support rollers 12 on the rebar storage rack 1 are retracted, and the hanger DJ is fixed with the bottom die DM and the rebar cage GJL ready for hoisting, as shown in fig. 6.
(8) The bottom die DM, the inner die NM and the reinforcement cage GJL are integrally assembled with the outer die WM.
As shown in fig. 7, the roll-over stand 6 and the outer mold storage bracket 5 are arranged side by side left and right and fixed on the ground, the roll-over stand 6 comprises a fixed bracket body 61 and a plurality of pad beams 62 rotatably hinged at one end of the fixed bracket body, a jacking device 63 is detachably connected between the pad beams and the fixed bracket body, a bracket 64 is arranged at the bottom of the outer wall of the pad beam, and the pad beams 62 are jacked to be in a vertical state in the figure. The jacking device 63 can select an oil cylinder, an electric push rod or a spiral stay bar, and the spiral stay bar is adopted in the embodiment. The structure of the external mold storage bracket 5 is the same as that of the conventional external mold storage bracket.
The lower outer mold half WM is horizontally placed on the outer mold storage bracket 5 as shown in fig. 8.
The bottom die DM, the inner die NM and the reinforcement cage GJL are integrally hung into the lower half outer die WM by the hanging bracket, the bottom die is supported on the bracket 64 on the outer side of the pad beam of the roll-over stand 6, and the pad beam 62 and the bottom die DM are fixedly connected through bolts, as shown in fig. 9.
And (3) removing the hanging bracket, and clamping and fixing the upper half outer mold and the lower half outer mold with the bottom mold, as shown in fig. 10. And finishing the template assembly.
(9) And a positioning frame 7 is arranged at the top of the outer die WM to ensure that the inner die and the outer die are concentric, and an inner liner tube NCG is inserted into a corrugated tube BWG in the reinforcement cage GJL.
The middle position of the positioning frame 7 is provided with a mounting hole for sleeving the inner mold NM, and the position corresponding to the corrugated pipe is provided with a corresponding sleeve, namely the positioning frame can ensure the accurate positioning of the inner mold NM and the corrugated pipe BWG, as shown in fig. 11.
(10) Turning over the assembled integral piece
The spiral stay bar of the roll-over stand 6 is removed, and one end of the integral piece, which is far away from the roll-over stand 6, is lifted by using a gantry crane, so that the integral piece is turned to be in a vertical state along with the pad beam of the roll-over stand, as shown in fig. 12 and 13.
(11) The connecting bolts between the bottom die DM and the roll-over stand pad beam 62 are removed, the integral piece is hoisted to the bottom die support 8, and the bottom die DM is connected and fixed with the bottom die support 8 through the bolts, as shown in fig. 14.
(12) The operation platform 9 is put on top of the outer mould WM and fixed, as shown in fig. 15.
(13) Concrete is poured to form the pier stud as shown in fig. 16.
(14) When concrete pouring is completed and curing is carried out to a specified strength, the inner lining pipe NCG of the corrugated pipe BWG is drawn out, and the positioning frame 7 at the top of the outer die is removed, as shown in figure 17.
(15) And (4) hoisting the inner die NM out of the inner cavity of the pier column integrally or in sections after the inner die NM is folded, as shown in figure 18.
(16) The operation platform 9 is removed as shown in fig. 19.
(17) The outer mould WM is removed in two halves as shown in fig. 20.
As shown in fig. 21, after the pier stud is continuously maintained to meet the requirement, the pier stud is hoisted to a beam storage area for storage, and the bottom die is left on the bottom die support 7 for recovery.
According to the design idea and the specific construction process of the embodiment, the template assembly, the template working surface treatment, the position adjustment of the reinforcement cage in the inner mold, and the fixation of the embedded part and the corrugated pipe on the reinforcement cage are all carried out on the ground, so that the operation is convenient and rapid, the potential safety hazard of high-altitude operation is avoided, the operation of all links can be ensured to meet the design requirement, and the method is particularly suitable for the hollow pier column prefabrication construction operation with heavy weight and higher pier height.

Claims (5)

1. The method for prefabricating the hollow pier stud by integrally turning the inner mold, the outer mold and the reinforcement cage is characterized in that: according to the method, an external mold which is placed horizontally is divided into an upper part and a lower part along the circumferential direction, a formed reinforcement cage is horizontally placed on a reinforcement cage storage support, an internal mold is horizontally placed on the internal mold storage support after being assembled, then the internal mold is horizontally pulled into the reinforcement cage, a bottom mold, the internal mold and the reinforcement cage are fixed to form a horizontal integral piece, the integral piece is assembled with the external mold in a horizontal state and fixed with a turnover frame, and finally the template and the reinforcement cage are integrally turned over to be in a vertical state through the turnover frame to perform pier column prefabrication.
2. The method of claim 1, wherein: the support is deposited to steel reinforcement cage includes the support body and connects in its both sides top can stretch out and draw back from top to bottom's activity supporting roller, and activity supporting roller can stretch out and draw back and can follow the vertical rotation of support body between steel reinforcement cage stirrup clearance, and the initial condition of activity supporting roller is that the level that the steel reinforcement cage is not interfered to the withdrawal state is placed, supports the centre form when activity supporting roller stretches out and slides in the steel reinforcement cage.
3. The method of claim 2, wherein: when the centre form horizontal assembly, draw the big-end-back guide cone in front of the end connection, the diameter of guide cone rear end is the same with the centre form external diameter, and the upper end both sides that the support was deposited to the centre form are provided with supporting roller, and supporting roller's direction of rotation is the vertical that the support was deposited to the centre form.
4. The method of claim 3, wherein: the roll-over stand includes fixed support body and rotatable many pad roof beams that articulate in its one end, can dismantle between pad roof beam and the fixed support body and be connected with the jacking device, and the outer wall bottom of pad roof beam is provided with the bracket, and when the pad roof beam was promoted to vertical state, the die block that assembles well with centre form and steel reinforcement cage was arranged in on the bracket and is passed through the fastener with the pad roof beam and is connected.
5. The method according to claim 4, characterized in that it comprises the following steps:
(1) arranging and fixing the steel reinforcement cage storage bracket and the internal mold storage bracket on the ground left and right, wherein the width direction central planes of the two brackets are coplanar;
(2) adjusting a movable supporting roller on the reinforcement cage storage bracket to a retraction state, and hoisting the formed reinforcement cage to the reinforcement cage storage bracket;
(3) assembling the inner die, connecting a guide cone at one end of the inner die, and hoisting the integral inner die component to a support roller of the inner die storage bracket;
(4) adjusting a movable support roller on the steel reinforcement cage storage bracket to be in an extending state, so that the movable support roller is flush with a support roller on the internal mold storage bracket;
(5) drawing the guide cone to enable the inner die to slide into the reinforcement cage;
(6) removing the guide cone, connecting and fixing the bottom die and the end of the inner die through a fastener, and fixing the bottom die and the reinforcement cage;
(7) retracting the movable support rollers on the steel reinforcement cage storage bracket, and fixing the hanger, the bottom die and the steel reinforcement cage for ready hoisting;
(8) external mold hoisting and roll-over stand in place
The turnover frame and the outer mold support are arranged and fixed on the ground left and right, the lower half outer mold is hoisted to the outer mold support, and the pad beam of the turnover frame is turned to be in a vertical state;
(9) hoisting the bottom die, the inner die and the reinforcement cage integral piece to the lower half outer die by the hoisting frame, supporting the bottom die on a bracket at the bottom of the outer side of the pad beam, and fixing the bottom die and the pad beam by a fastener;
(10) after the hanging frame is disassembled, the upper half outer mold is installed and fixed with the bottom mold, and thus the bottom mold, the inner mold, the reinforcement cage and the outer mold are assembled into an integral piece;
(11) a positioning frame is arranged on the top of the outer mold, and an inner liner tube is inserted into the corrugated tube, so that the inner mold and the corrugated tube are accurately positioned;
(12) removing the jacking device of the roll-over stand, and hoisting one end of the assembled integral piece away from the roll-over stand to enable the integral piece to be turned over to a vertical state along with the pad beam;
(13) removing a fastener between the bottom die and the pad beam, hoisting the whole piece onto a bottom die support, and connecting and fixing the bottom die and the bottom die support through the fastener;
(14) installing an operation platform on the top of the outer mold;
(15) pouring concrete to form the pier stud, maintaining to a specified strength, then drawing out the lining pipe of the corrugated pipe, and removing the positioning frame;
(16) the inner die is folded and then is lifted out of the inner cavity of the pier stud;
(17) the operation platform and the outer die are successively dismantled, and the pier stud is exposed;
(18) and (4) continuing maintaining the pier stud, hoisting the pier stud to a storage area after maintaining is finished, and reserving the bottom die on the bottom die support for recycling.
CN202011618945.1A 2020-12-30 2020-12-30 Method for prefabricating hollow pier stud by integrally overturning inner mold, outer mold and reinforcement cage Pending CN112757474A (en)

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