A prefabricated pier column reinforcement cage and a whole hoisting construction method thereof

Abstract

The application discloses a prefabricated pier column reinforcement cage and a whole hoisting construction method thereof. Firstly, horizontal lifting points of the pier column reinforcement cage are designed according to design drawings, and reasonable arrangement of the horizontal lifting points can effectively reduce the bending moment of the pier column reinforcement cage in the hoisting process. Secondly, multiple cross X-shaped diagonal braces are arranged in the interior of the support reinforcement cage in a transverse and interval mode, and herringbone braces are arranged on the side walls. In the manufacturing process of the cross X-shaped diagonal braces and the herringbone braces, various peripheral auxiliary frame bodies do not need to be erected, materials can be conveniently and quickly obtained on site, the overall rigidity of the pier column reinforcement cage during hoisting is effectively increased, the pier column reinforcement cage can be quickly hoisted into place, the overall stability and safety of the reinforcement cage during the hoisting process can be ensured, manpower and mechanical use are saved, and the construction efficiency and the safety of the construction are improved.

Description

Technical Field

[0001] This invention relates to the field of building construction, specifically to a precast pier column steel cage and its overall hoisting construction method. Background Technology

[0002] With the rapid development of engineering technology, the requirements for construction efficiency are becoming increasingly stringent. Optimizing construction processes can effectively improve construction efficiency. Traditional pier reinforcement cage construction requires the erection of various external auxiliary scaffolding within the foundation pit, and the reinforcement bars need to be hoisted and tied one by one to form the pier reinforcement cage. The working space for workers in the foundation pit is small, the construction conditions are poor, there are certain safety hazards, and the construction difficulty and steps are cumbersome and complex, resulting in low construction efficiency, difficulty in ensuring construction quality, and a significant increase in the construction period.

[0003] Driven by the requirements of construction efficiency and quality, the technology of integral hoisting for bridge pier reinforcement cages is increasingly used in engineering projects. This technology can save labor costs and effectively shorten the construction cycle. However, for large piers such as pier reinforcement cages, due to their large length and weight, if the bottom of the pier reinforcement cage is prefabricated and combined with the integral hoisting process, with the hoisting points set on the stirrups, bending moments may occur in the pier reinforcement cage during hoisting, damaging the connection between the main reinforcement and the stirrups, affecting its overall stability, and making it difficult to guarantee safety during construction. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention provides a precast pier column steel cage and its overall hoisting construction method, which can effectively shorten the construction cycle and ensure the safety of the construction process.

[0005] This invention is achieved through the following technical solution:

[0006] A precast pier column reinforcement cage includes a pier column reinforcement cage body, a cross support device, a longitudinal support structure, and pile cap reinforcement bars;

[0007] The pier cap reinforcing bars are installed at the lower end of the pier column reinforcement cage body. The pier cap reinforcing bars are used to connect the pier cap reinforcement cage pre-embedded in the foundation pit. Multiple cross support devices are installed inside the pier column reinforcement cage body and are arranged at intervals along the axial direction of the pier column reinforcement cage body. The longitudinal support structure is fixed on the side wall of the pier column reinforcement cage. When the precast pier column reinforcement cage is hoisted as a whole, the side wall is in a vertical state.

[0008] Preferably, the cross-support device includes multiple main reinforcing bars arranged radially, the cross-support device is arranged radially along the main body of the pier column reinforcing cage, and the ends of the main reinforcing bars are fixedly connected to the stirrups.

[0009] Preferably, the cross support device is a cross diagonal brace, which comprises two main reinforcement bars arranged in a cross shape, and the intersection is welded and fixed, and the four ends of the cross diagonal brace are respectively fixed to the stirrups of the right-angle turning points of the pier reinforcement cage body.

[0010] Preferably, the longitudinal support structure comprises a plurality of diagonal reinforcement bars, the plurality of diagonal reinforcement bars are sequentially connected in head-to-tail mode, adjacent two diagonal reinforcement bars are arranged in a herringbone shape, and in the prefabricated state of the pier reinforcement cage body, the longitudinal support structure is located on the two vertical side walls of the pier reinforcement cage body.

[0011] Preferably, the pier reinforcement cage body is provided with a horizontal lifting point group and a vertical lifting point group.

[0012] In the prefabricated state of the pier reinforcement cage body, the horizontal lifting point group is arranged at the top of the pier reinforcement cage body, and the vertical lifting point group is arranged on the cross support device at the upper end of the pier reinforcement cage body.

[0013] A whole hoisting construction method of a prefabricated pier reinforcement cage comprises the following steps.

[0014] Step 1: determining the horizontal lifting points of the pier reinforcement cage according to the design drawing of the pier reinforcement cage.

[0015] Step 2: manufacturing the prefabricated pier reinforcement cage on a jig, and arranging a plurality of cross support devices in the interior of the prefabricated pier reinforcement cage along the axial direction of the prefabricated pier reinforcement cage, arranging a longitudinal support structure on the side wall of the pier reinforcement cage, and arranging a vertical lifting point on the cross support device at the top end of the pier reinforcement cage.

[0016] Step 3: arranging a positioning and fixing support at the lower end of the bearing cap reinforcing bar.

[0017] Step 4: after the jig is removed, the main hook of the crane is connected to the vertical lifting point, the auxiliary hook of the crane is connected to the horizontal lifting point at the lower end of the prefabricated pier reinforcement cage, the prefabricated pier reinforcement cage is hoisted horizontally to a predetermined height, the auxiliary hook is slowly lowered until the prefabricated pier reinforcement cage is in a vertical state, then the pier reinforcement cage is hoisted and transported to the foundation pit in the vertical state, and the pier reinforcement cage is connected to the bearing cap reinforcement cage in the foundation pit through the positioning and fixing support.

[0018] Preferably, the setting method of the horizontal lifting points of the pier reinforcement cage in step 1 is as follows:

[0019] In the prefabricated state of the prefabricated pier reinforcement cage, four horizontal lifting points are arranged at the top of the prefabricated pier reinforcement cage, the four horizontal lifting points are symmetrically distributed along the central axis of the pier reinforcement cage, the horizontal lifting points are located along the edge of the side wall of the pier reinforcement cage, and the horizontal lifting points are kept at a set distance from the top end and the end of the pier reinforcement cage.

[0020] Preferably, the calculation method of the set distance of the horizontal lifting points from the top end and the end of the pier reinforcement cage is as follows:

[0021] X=0.2L

[0022] Wherein, L is the length of the pier reinforcement cage.

[0023] Preferably, the method of removing the rack in step 4 is as follows:

[0024] The main hook of the crane is connected to all horizontal lifting points respectively, and the prefabricated pier reinforcement cage is lifted to a predetermined height and then the rack is removed.

[0025] Preferably, step 4 further comprises the following steps:

[0026] Step 5, the pier reinforcement cage end of the bearing platform is fixed by positioning the fixed support and the bearing platform reinforcement cage embedded in the foundation pit, and then welded and fixed;

[0027] Step 6, the prefabricated pier reinforcement cage is fixed around the cable wind rope ground anchor and the prefabricated concrete block on the ground.

[0028] Step 7, the concrete is poured at the bearing platform reinforcement cage, and when the bearing platform concrete strength reaches the design requirement, the bearing platform formwork is removed, and then the cable wind rope ground anchor around the prefabricated pier reinforcement cage is removed.

[0029] Compared with the prior art, the present application has the following beneficial technical effects:

[0030] The prefabricated pier reinforcement cage provided by the present application changes the existing pier reinforcement cage foundation pit manufacturing method, and the existing pier reinforcement cage is manufactured in the foundation pit, which is changed to prefabricate the pier reinforcement cage on the ground, and a cross support device and a longitudinal support structure are arranged in the interior of the pier reinforcement cage body. The axial direction of the pier reinforcement cage body is in a horizontal state during the prefabrication process, so the horizontal lifting is performed first during the lifting and transportation. At this time, the two side walls of the pier reinforcement cage body bear the main bending moment, so the longitudinal support structure is added on the two side walls, which can effectively avoid the deformation of the prefabricated pier reinforcement cage during the lifting and transportation.

[0031] The prefabricated pier reinforcement cage whole lifting construction method provided by the present application first designs the horizontal lifting points of the pier reinforcement cage according to the design drawing. The reasonable arrangement of the horizontal lifting points can effectively reduce the bending moment of the pier reinforcement cage during the lifting and transportation. Secondly, a plurality of cross diagonal braces are arranged in the interior of the support reinforcement cage in a transverse and interval manner, and a herringbone brace is arranged on the side wall. Moreover, the cross diagonal brace and the herringbone brace do not need to be erected during the manufacturing process. The peripheral auxiliary frame body is convenient and fast to manufacture on site, effectively increases the overall rigidity of the pier reinforcement cage during the lifting, enables the pier reinforcement cage to be quickly lifted into place, and guarantees the overall stability and safety of the reinforcement cage during the lifting process. The present application saves manpower and mechanical use, improves the construction efficiency and the safety of the construction. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 The flow chart of the whole hoisting construction method of the prefabricated pier column steel reinforcement cage of the application.

[0033] Fig. 2 The front view of the prefabricated pier column steel reinforcement cage of the application;

[0034] Fig. 3 The cross-sectional view of the prefabricated pier column steel reinforcement cage of the application.

[0035] In the figure, 1, pier column steel reinforcement cage body; 2, cross-shaped diagonal bracing; 3, herringbone bracing; 4, pile cap reinforcing bar; DETAILED DESCRIPTION

[0036] The application will be further described in detail below with reference to the accompanying drawings, which are an explanation of the application rather than a limitation.

[0037] Reference Figs. 1-3 A prefabricated pier column steel reinforcement cage, comprising a pier column steel reinforcement cage body 1, cross bracing devices, longitudinal bracing structures and pile cap reinforcing bars 4.

[0038] The pile cap reinforcing bars 4 are arranged at the lower end of the pier column steel reinforcement cage body 1, and are used to connect the pile cap steel reinforcement cage pre-buried in the foundation pit. A plurality of cross bracing devices are arranged inside the pier column steel reinforcement cage body 1 and are arranged at intervals along the axial direction of the pier column steel reinforcement cage body 1. The longitudinal bracing structures are fixed on the side wall of the pier column steel reinforcement cage, which is in a vertical state when the prefabricated pier column steel reinforcement cage is hoisted as a whole.

[0039] The pier column steel reinforcement cage body 1 comprises main reinforcement bars and stirrups. A plurality of main reinforcement bars are arranged at intervals and in parallel with each other and are arranged in a ring shape in sequence. The stirrups are in a ring-shaped closed structure, are sleeved outside the plurality of main reinforcement bars and are welded and fixed with the main reinforcement bars. A plurality of stirrups are arranged at intervals along the axial direction of the main reinforcement bars. The axial directions of the main reinforcement bars and the stirrups are perpendicular to each other. The contact points of the main reinforcement bars and the stirrups are welded and fixed.

[0040] The cross bracing devices comprise a plurality of main reinforcement bars arranged in a radial manner. The cross bracing devices are arranged along the radial direction of the pier column steel reinforcement cage body. The end portions of the main reinforcement bars are welded with the stirrups. The increase of the plurality of cross bracing devices inside the pier column steel reinforcement cage body 1 can effectively improve the overall rigidity of the prefabricated pier column steel reinforcement cage and avoid the bending of the prefabricated pier column steel reinforcement cage during horizontal hoisting.

[0041] In this embodiment, the cross bracing devices are cross-shaped diagonal bracings 2, which comprise two main reinforcement bars arranged in a cross shape. The cross points are welded and fixed. The cross section of the pier column steel reinforcement cage body is rectangular. The four end portions of the cross-shaped diagonal bracings are welded and fixed with the stirrups of the right-angle turning points of the pier column steel reinforcement cage body.

[0042] In another embodiment, the cross bracing devices comprise a plurality of main reinforcement bars, which are arranged in a rice-shaped manner.

[0043] The longitudinal support structure comprises a plurality of diagonal struts, the plurality of diagonal struts are sequentially connected in head-to-tail mode, adjacent two diagonal struts are arranged in a herringbone shape, in the prefabricated state of the pier reinforcement cage body 1, the longitudinal support structure is located on the two vertical side walls of the pier reinforcement cage body 1, the contact points of the diagonal struts and all the main bars of the side wall are welded and fixed, the axial direction of the pier reinforcement cage body 1 is in a horizontal state during the prefabrication process, therefore, during hoisting, the pier reinforcement cage body 1 is first hoisted horizontally, at this time, the two side walls of the pier reinforcement cage body 1 bear the main bending moment, therefore, the longitudinal support structure is added to the two side walls, which can effectively avoid the deformation of the prefabricated pier reinforcement cage during hoisting.

[0044] The bearing platform insert bar comprises a plurality of insert bars, the plurality of insert bars are coaxial with the main bars of the pier reinforcement cage body and are welded with each other, in the embodiment, the main bars of the pier reinforcement cage body extend to the lower end of the pier reinforcement cage body by a certain length to form the bearing platform insert bar.

[0045] The pier reinforcement cage body is provided with a horizontal lifting point group and a vertical lifting point group.

[0046] In the prefabricated state of the pier reinforcement cage body, the horizontal lifting point group is arranged at the top of the pier reinforcement cage body, the horizontal lifting point group comprises a plurality of horizontal lifting points, the plurality of horizontal lifting points are symmetrically distributed along the center of the pier reinforcement cage body, and the horizontal lifting points are kept at a certain distance from the upper end and the lower end of the pier reinforcement cage body.

[0047] In the embodiment, the horizontal lifting point group comprises four lifting points, the horizontal lifting points are located along the top edge of the pier reinforcement cage, and the distance between the horizontal lifting points and the end of the pier reinforcement cage body is 0.2L, L being the length of the pier reinforcement cage body.

[0048] The vertical lifting point group is arranged on the cross support device at the upper end of the pier reinforcement cage body, the vertical lifting point comprises four vertical lifting points and is located at the corner position of the pier reinforcement cage body, the horizontal lifting points and the vertical lifting points are both provided with lifting lugs for connecting lifting ropes.

[0049] Referring to Figs. 1-3 A prefabricated pier reinforcement cage overall hoisting construction method, comprising the following steps:

[0050] Step 1, determining the horizontal lifting points of the pier reinforcement cage according to the design drawing of the pier reinforcement cage, the method specifically comprises the following steps:

[0051] When the prefabricated along the pier column reinforcement cage is in a prefabricated state, four horizontal lifting points are arranged on the top surface of the prefabricated along the pier column reinforcement cage, the four horizontal lifting points are symmetrically distributed along the central axis of the pier column reinforcement cage, the horizontal lifting points are located on the top surface edges of the pier column reinforcement cage, the horizontal lifting points are kept a set distance X from the upper end and the lower end of the pier column reinforcement cage, and the four horizontal lifting points are designed to ensure that the bending moment of the pier column reinforcement cage is minimum after being lifted horizontally. The calculation method of the set distance X is as follows:

[0052] X = 0.2L

[0053] Wherein, L is the length of the pier column reinforcement cage.

[0054] Step 2, make the pier column reinforcement cage body 1, and arrange a plurality of cross X-shaped diagonal braces 2 in the interior of the pier column reinforcement cage body along the axial direction thereof, meanwhile, arrange herringbone braces 3 on the two vertical side walls of the pier column reinforcement cage body, and arrange vertical lifting points on the cross X-shaped diagonal braces at the upper end of the pier column reinforcement cage body. The pier column reinforcement cage includes two steps in total, and the steps are as follows:

[0055] S.1, on-site processing and manufacturing of the pier column reinforcement cage lower part jig, after the jig is processed, the whole prefabrication of the pier column reinforcement cage is carried out on the jig, and one cross X-shaped diagonal brace is arranged every set distance during the prefabrication, the cross X-shaped diagonal brace is arranged along the transverse direction of the pier column reinforcement cage body and is fixed with the hoop of the interior wall of the pier column reinforcement cage, the cross X-shaped diagonal brace includes two main steels which are cross arranged, the intersection is welded and fixed, and the end of the main steel is welded and fixed with the hoop of the right-angle inflection point of the pier column reinforcement cage.

[0056] The herringbone braces are arranged on the vertical side walls of the pier column reinforcement cage body, the herringbone brace includes a plurality of continuous diagonal bracing steels, the diagonal bracing steels are arranged along the axial direction of the pier column reinforcement cage, and the diagonal bracing steels are arranged obliquely, and the adjacent two diagonal bracing steels are connected in a head-to-tail mode.

[0057] The cross X-shaped diagonal brace and the herringbone brace are made of main steels and are welded in the pier column reinforcement cage, which can effectively reduce the deformation of the prefabricated pier column reinforcement cage during the whole hoisting process.

[0058] S2.2, a plurality of vertical lifting points are uniformly arranged on the cross X-shaped diagonal braces at the top of the prefabricated pier column reinforcement cage, the vertical lifting points are connected with lifting ropes and serve as vertical lifting points.

[0059] In the embodiment, four vertical lifting points are arranged and are respectively located at the connection positions of the cross X-shaped diagonal braces and the pier column reinforcement cage.

[0060] Step 3, the lifting lugs for connecting the lifting ropes are fixed on the horizontal lifting points and the vertical lifting points of the prefabricated pier column reinforcement cage, so as to prevent the lifting ropes from being separated during the hoisting process.

[0061] Step 4, positioning and fixing supports are arranged on the pile caps of the prefabricated pier column reinforcement cage, so as to accurately position and connect the pier column reinforcement cage and the pile cap reinforcement cage.

[0062] Step 5, the prefabricated pier column reinforcement cage is hoisted to the designated position by horizontal lifting points and vertical lifting points, and the hoisting method of the prefabricated pier column reinforcement cage is as follows:

[0063] S5.1, the main hook of the crane is connected with four horizontal lifting points respectively, and the prefabricated pier column reinforcement cage is hoisted to the predetermined height, and then the jig is removed;

[0064] S5.2, after the jig is removed, the prefabricated pier column reinforcement cage is placed on the ground, the main hook of the crane is connected with four vertical lifting points, and the auxiliary hook of the crane is connected with two horizontal lifting points at the lower end of the pier column reinforcement cage.

[0065] S5.3, the pier column reinforcement cage is hoisted to the predetermined height, the position of the auxiliary hook is adjusted, the auxiliary hook is slowly lowered until the prefabricated pier column reinforcement cage is in a vertical state, then the auxiliary hook is removed, and the pier column reinforcement cage is moved into the foundation pit through the main hook.

[0066] Step 6, the bearing platform reinforcing bar 4 at the lower end of the prefabricated pier column reinforcement cage is welded and fixed through the positioning and fixing support and the bearing platform reinforcement cage 4 embedded in the foundation pit.

[0067] Step 7, the prefabricated pier column reinforcement is fixed around by cable wind rope ground anchor and precast concrete block on the ground.

[0068] Step 8, the concrete is poured at the bearing platform reinforcement cage, and when the bearing platform concrete strength reaches the design requirement, the bearing platform formwork is removed, and then the reinforcement cage cable wind rope is removed.

[0069] The prefabricated pier column reinforcement cage whole hoisting construction method provided by the application replaces the traditional pier column reinforcement cage construction, does not need to set up various peripheral auxiliary frame bodies, makes inclined braces on site, increases the overall rigidity of the pier column reinforcement cage during hoisting, enables the pier column reinforcement cage to be quickly hoisted in place, and guarantees the overall stability and safety of the reinforcement cage during hoisting, and saves manpower and mechanical use.

[0070] The above content only illustrates the technical idea of the application, and cannot limit the protection scope of the application, and any modification made according to the technical idea of the application on the basis of the technical scheme falls within the protection scope of the claims of the application.

Claims

1. A precast pier column reinforcement cage, characterized in that, Includes the pier column reinforcement cage body (1), cross support device, longitudinal support structure and pile cap reinforcement (4). The pier cap reinforcing bar (4) is set at the lower end of the pier column steel cage body (1). The pier cap reinforcing bar (4) is used to connect the pier cap steel cage pre-embedded in the foundation pit. Multiple cross support devices are set inside the pier column steel cage body (1) and are arranged at intervals along the axial direction of the pier column steel cage body (1). The longitudinal support structure is fixed on the side wall of the pier column steel cage. When the precast pier column steel cage is hoisted as a whole, the side wall is in a vertical state. The cross support device is a cross brace (2), which includes two main steel bars arranged in a cross shape, with the intersection point welded and fixed. The four ends of the cross brace are respectively fixed to the stirrups at the right-angle inflection points of the pier column steel cage body. The longitudinal support structure includes multiple diagonal bracing bars, which are connected end to end in sequence. Adjacent diagonal bracing bars are arranged in a herringbone shape. In the prefabricated state of the pier column steel cage body (1), the longitudinal support structure is located on two vertical side walls of the pier column steel cage body (1). The pier column reinforcement cage body is equipped with horizontal lifting point groups and vertical lifting point groups; In the prefabricated state, the horizontal lifting point group of the pier column reinforcement cage body is set on the top of the pier column reinforcement cage body, and the vertical lifting point group is set on the cross support device at the upper end of the pier column reinforcement cage body.

2. A method for the overall hoisting construction of the precast pier column reinforcement cage as described in claim 1, characterized in that, Includes the following steps: Step 1: Determine the horizontal lifting points of the pier reinforcement cage according to the design drawings of the pier reinforcement cage; Step 2: Fabricate a precast pier column reinforcement cage on the jig. Set multiple cross support devices at intervals along its axial direction inside the precast pier column reinforcement cage. At the same time, set a longitudinal support structure on the side wall of the pier column reinforcement cage and set a vertical lifting point on the cross support device at the top of the precast pier column reinforcement cage. Step 3: Set a positioning and fixing bracket at the lower end of the pier cap reinforcing bar (4); Step 4: After removing the jig, connect the main hook of the crane to the vertical lifting point and the auxiliary hook of the crane to the horizontal lifting point at the lower end of the precast pier column steel cage. After the precast pier column steel cage is horizontally lifted to the predetermined height, slowly lower the auxiliary hook until the precast pier column steel cage is in a vertical state. Then, lift the pier column steel cage in a vertical state to the foundation pit and connect it to the foundation cap steel cage in the foundation pit through the positioning and fixing bracket.

3. The method for integral hoisting of precast pier reinforcement cages according to claim 2, characterized in that, The method for setting the horizontal lifting points of the pier column reinforcement cage in step 1 is as follows: In the prefabricated state, four horizontal lifting points are set on the top of the prefabricated pier column reinforcement cage. The four horizontal lifting points are symmetrically distributed along the central axis of the pier column reinforcement cage and are located along the side wall edge of the pier column reinforcement cage. The horizontal lifting points are kept at a set distance from the top and bottom of the pier column reinforcement cage.

4. The method for integral hoisting of precast pier reinforcement cages according to claim 3, characterized in that, The calculation method for maintaining a set distance between the horizontal lifting points along the top and bottom of the pier reinforcement cage is as follows: X=0.2L Where L is the length of the steel reinforcement cage of the pier column.

5. The method for integral hoisting of precast pier reinforcement cages according to claim 2, characterized in that, The method for removing the tire frame in step 4 is as follows: The crane's main hook connects to all horizontal lifting points, and after lifting the precast pier steel cage to the predetermined height, the jig is removed.

6. The method for integral hoisting of precast pier reinforcement cages according to claim 2, characterized in that, Step 4 is followed by the following steps: Step 5: After positioning the bottom reinforcement bar (4) of the precast pier column reinforcement cage with the pre-embedded reinforcement cage in the foundation pit through the positioning and fixing bracket, weld and fix it. Step 6: Secure the precast pier column reinforcement cage to the precast concrete blocks on the ground using guy ropes and ground anchors. Step 7: Pour concrete at the foundation reinforcement cage. Once the foundation concrete reaches the design strength, remove the foundation formwork and then remove the guy rope ground anchors around the precast pier column reinforcement cage.

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