A support preloading device based on pier top prestressing and construction method

Abstract

Provided is a support preloading device based on pier top prestressing, comprising: a force transmission system, a force receiving system and an anchoring system; the force transmission system comprises a cushion beam and a longitudinal beam (3), wherein the longitudinal beams are multiple and longitudinally supported on the top surface of the cushion beam; the force receiving system comprises an upper shoulder beam, a lower shoulder beam and a jack; the anchoring system comprises an anchoring beam (8), a pier top vertical prestressing device, a precision rolled threaded steel sleeve (9), a pier top prestressing device (10) and a precision rolled threaded steel nut; the anchoring beam adopts double-jointed steel and is opened according to the arrangement of the pier top prestressing; during installation, the anchoring beam is passed through the pier top prestressing device and anchored on the top with a precision rolled threaded steel nut; during support preloading, the anchoring system anchors the counter-pressure device, the pier top vertical prestressing device outputs a preloading load, which is transmitted downwards through the force transmission system and uniformly acts on the support system (12); by adjusting the oil pressure gauge reading, the preloading load is applied to each level, thereby achieving the purpose of support preloading. A corresponding construction method is also provided.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a support preloading device based on pier top prestressing and a construction method. Background Art

[0002] Prestressing cast-in-place beam supports is an essential and critical step in bridge construction. This is typically achieved through surcharge prestressing. However, surcharge prestressing requires significant material investment, a long construction period, and a high degree of risk. Therefore, a new surcharge prestressing device based on pier top prestressing and a corresponding construction method are needed. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the purpose of the present invention is to provide a support prestressing device and a construction method based on pier top prestressing.

[0004] The object of the present invention is to provide a support prestressing device based on pier top prestressing, comprising:

[0005] A force transmission system, a force receiving system and an anchoring system; wherein the force transmission system comprises a cushion beam and a longitudinal beam (3), wherein the longitudinal beams (3) are multiple and are longitudinally supported on the top surface of the cushion beam; the force receiving system comprises an upper shoulder beam, a lower shoulder beam and a jack; the anchoring system comprises an anchoring beam (8), a jack (11), a precision-rolled threaded steel sleeve (9), a pier top prestress (10) and a precision-rolled threaded steel nut; the anchoring beam (8) is made of double-jointed steel and is opened according to the arrangement of the pier top prestress; during installation, the anchoring beam (8) is passed through the pier top prestress and is anchored on top with the precision-rolled threaded steel nut; when the support is prestressed, the anchoring system anchors the counter-pressure device, and the pier top vertical prestressing device outputs the prestressing load; the prestressing load is transmitted downward through the force transmission system and evenly acts on the support system (12); by adjusting the oil pressure gauge reading, the prestressing load is loaded to each level, thereby achieving the purpose of prestressing the support.

[0006] Preferably, the cushion beam comprises a cushion beam (1) at the web and a cushion beam (2) at the bottom plate.

[0007] Preferably, the lower shoulder beam comprises a lower shoulder beam (4) at the web and a lower shoulder beam (5) at the bottom plate, and the lower shoulder beam (4) at the web and the lower shoulder beam (5) at the bottom plate are respectively installed on the top surface of the longitudinal beam (3).

[0008] Preferably, the upper shoulder beam comprises an upper shoulder beam (6) at the web and an upper shoulder beam (7) at the bottom plate, and the upper shoulder beam (6) at the web and the upper shoulder beam (7) at the bottom plate are respectively supported and connected to the lower shoulder beam (4) at the web and the lower shoulder beam (5) at the bottom plate through support members.

[0009] Preferably, the anchor beams (8) are multiple and are longitudinally mounted on the top surfaces of the upper shoulder beam (6) at the web and the upper shoulder beam (7) at the bottom plate.

[0010] Preferably, the fine-rolled threaded steel sleeve (9) and the pier top prestressing force (10) are symmetrically arranged with the plurality of anchor beams (8), and are longitudinally installed on the top surface of the upper shoulder beam (6) at the web and the upper shoulder beam (7) at the bottom plate.

[0011] Preferably, the support system (12) is modular and connected to the force transmission system.

[0012] Preferably, the support pre-pressing device is installed on the pier body (13), and the pier body (13) serves as a support member for the support pre-pressing device.

[0013] Preferably, a plurality of the pier bodies (13) are symmetrically and evenly spaced on the box beam (14) to be cast.

[0014] The present invention also aims to provide a method for constructing a support prestressing device based on pier top prestressing, comprising the steps of:

[0015] Step 1: After installing the bracket, lay a bottom mold on the bracket;

[0016] Step 2, laying the web plate and the bottom plate pad beam (2) and the distribution beam on the bottom mold in sequence;

[0017] Step 3, sequentially installing the upper shoulder beam (6) at the web, the upper shoulder beam (7) at the bottom plate, the jack (11), the lower shoulder beam (5) at the bottom plate, and the lower shoulder beam (4) at the web at the prestressed position of the pier top;

[0018] Step 4, passing the anchor beam (8) through the pier top prestressing force, placing it on the upper shoulder beam (6) at the web and the upper shoulder beam (7) at the bottom plate, installing the finished rolled threaded steel nut, and anchoring the anchor beam (8);

[0019] Step 5, the jack (11) applies oil pressure synchronously, and the output force of the jack (11) is controlled by the oil pressure gauge to preload the bracket in stages, and the deformation value of the bracket is recorded during the preloading process;

[0020] Step 6: After the pre-pressing is completed, remove the pre-pressing device from top to bottom, adjust the template elevation, and proceed to the next construction process.

[0021] Beneficial effects of the present invention:

[0022] The support preloading device and construction method based on pier top prestressing utilize the pier top prestressing and anchoring system to anchor the preloading device, and transmit the jack output force to the support through the force system and the force transmission system, eliminating the need for traditional piled preloading material input, reducing construction risks, and having simple operation and high preloading accuracy. The preloading equipment can be installed and dismantled using a construction tower crane, without the need for a specially configured large crane, and has good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the three-dimensional structure of a stent pre-compression device according to a preferred embodiment of the present invention.

[0024] Figure 2 It is a left view of the three-dimensional structure of the bracket pre-compression device according to a preferred embodiment of the present invention.

[0025] Figure 3 1. A top view of the force transmission system of a stent preloading device according to a preferred embodiment of the present invention.

[0026] Figure 4 It is a top view of the force and anchoring system of the support preloading device according to a preferred embodiment of the present invention.

[0027] Among them: 1- pad beam at the web, 2- pad beam at the bottom plate; 3- longitudinal beam, 4- lower shoulder beam at the web, 5- lower shoulder beam at the bottom plate, 6- upper shoulder beam at the web, 7- upper shoulder beam at the bottom plate, 8- anchor beam, 9- fine-rolled threaded steel sleeve, 10- prestressed steel at the pier top, 11- jack, 12- support system, 13- pier body, 14- box beam to be cast. DETAILED DESCRIPTION

[0028] like Figures 1 to 4 The present invention is further described in conjunction with specific embodiments and accompanying drawings.

[0029] like Figure 1-4 The support prestressing device based on pier top prestressing includes: a force transmission system, a force bearing system and an anchoring system; wherein the force transmission system includes a cushion beam and a longitudinal beam 3, and there are multiple longitudinal beams 3, which are longitudinally supported on the top surface of the cushion beam; the force bearing system includes an upper shoulder beam, a lower shoulder beam and a jack; the anchoring system includes an anchor beam 8, a jack 11, a precision-rolled threaded steel sleeve 9, a pier top prestressing 10 and a precision-rolled threaded steel nut; the anchor beam 8 adopts double-piece steel and is opened according to the pier top prestressing arrangement. During installation, the anchor beam 8 is passed through the pier top prestressing and anchored on the top with a precision-rolled threaded steel nut. When the support is prestressed, the anchoring system anchors the counter-pressure device, and the pier top vertical prestressing device outputs the prestressing load. The prestressing load is transmitted downward through the force transmission system and acts evenly on the support system 12. By adjusting the oil pressure gauge reading, it is loaded to each level of prestressing load to achieve the purpose of support prestressing.

[0030] Among them, the cushion beam includes a cushion beam 1 at the web and a cushion beam 2 at the bottom plate. The lower shoulder beam includes a lower shoulder beam 4 at the web and a lower shoulder beam 5 at the bottom plate, and the lower shoulder beam 4 at the web and the lower shoulder beam 5 at the bottom plate are respectively installed on the top surface of the longitudinal beam 3. The upper shoulder beam includes an upper shoulder beam 6 at the web and an upper shoulder beam 7 at the bottom plate, and the upper shoulder beam 6 at the web and the upper shoulder beam 7 at the bottom plate are respectively supported and connected to the lower shoulder beam 4 at the web and the lower shoulder beam 5 at the bottom plate through support members. There are multiple anchor beams 8, which are longitudinally installed on the top surfaces of the upper shoulder beam 6 at the web and the upper shoulder beam 7 at the bottom plate. The fine-rolled threaded steel sleeve 9 and the pier top prestressing force 10 are respectively symmetrically arranged with the multiple anchor beams 8, and longitudinally installed on the top surfaces of the upper shoulder beam 6 at the web and the upper shoulder beam 7 at the bottom plate. In this embodiment, the vertical prestressing device at the pier top is a jack 11. Of course, other devices familiar to those skilled in the art can also be used as prestressing devices. The support system 12 is modular and connected to the force transmission system. The support prestressing device is installed on the pier body 13, which serves as the support for the support prestressing device. Multiple pier bodies 13 are symmetrically and evenly spaced on the box girder 14 to be cast.

[0031] The construction method of the support preloading device based on pier top prestressing comprises the following steps:

[0032] Step 1: After installing the bracket, lay the bottom formwork on the bracket;

[0033] Step 2: Lay the web plate, bottom plate pad beam 2 and distribution beam on the bottom form in sequence;

[0034] Step 3, sequentially install the upper shoulder beam 6 at the web, the upper shoulder beam 7 at the bottom plate, the jack 11, the lower shoulder beam 5 at the bottom plate, and the lower shoulder beam 4 at the web at the prestressed position of the pier top;

[0035] Step 4: Pass the anchor beam 8 through the pier top prestressing force, place it on the upper shoulder beam 6 at the web and the upper shoulder beam 7 at the bottom plate, install the finished rolled threaded steel nuts, and anchor the anchor beam 8;

[0036] Step 5: The jack 11 applies oil pressure synchronously, and the output force of the jack 11 is controlled by the oil pressure gauge to preload the bracket in stages, and the deformation value of the bracket is recorded during the preloading process;

[0037] Step 6: After the pre-pressing is completed, remove the pre-pressing device from top to bottom, adjust the template elevation, and proceed to the next construction process.

[0038] In this embodiment, the support prestressing device and construction method based on pier top prestressing utilize the pier top prestressing and anchoring system to anchor the prestressing device, and transmit the jack output force to the support through the force system and the force transmission system, thereby eliminating the need for traditional piled prestressing material input, reducing construction risks, and simplifying operation. The prestressing accuracy is high, and the installation and removal of the prestressing equipment can be done with a construction tower crane, without the need for a specially configured large crane, which has good economic and social benefits.

[0039] Although the above describes and illustrates the specific embodiments of the present invention in detail, it should be pointed out that we can make various equivalent changes and modifications to the above embodiments based on the concept of the present invention. As long as the functional effects produced do not exceed the spirit covered by the specification, they should all be within the scope of protection of the present invention.

Claims

1. A support preloading device based on pier top prestressing, comprising a support system, characterized in that: Also includes: The force transmission system includes a bottom formwork, a cushion beam, a longitudinal beam, and a distribution beam. The bottom formwork is laid on the support of the support system. The cushion beams include the web cushion beam and the bottom plate cushion beam. The web and bottom plate cushion beams and the distribution beam are laid on the bottom formwork in sequence. There are multiple longitudinal beams, and the longitudinal beams are longitudinally supported on the top surface of the cushion beam. The force-bearing system includes an upper shoulder beam, a lower shoulder beam and a jack. The upper shoulder beam includes an upper shoulder beam at the web and an upper shoulder beam at the bottom plate. The lower shoulder beam includes a lower shoulder beam at the web and a lower shoulder beam at the bottom plate. The lower shoulder beam at the web and the lower shoulder beam at the bottom plate are respectively installed on the top surface of the longitudinal beam. The upper shoulder beam at the web and the upper shoulder beam at the bottom plate are supported and connected to the lower shoulder beam at the web and the lower shoulder beam at the bottom plate through supporting members. The upper shoulder beam at the web and the bottom plate, the jack, and the lower shoulder beam at the web and the bottom plate are installed in sequence at the prestressed position of the pier top. The anchoring system includes anchor beams, precision-rolled threaded steel sleeves, pier top prestressing force, and precision-rolled threaded steel nuts. The anchor beams are made of double-piece steel and have holes arranged according to the pier top prestressing force. There are multiple anchor beams. During installation, the anchor beams are passed through the pier top prestressing force and anchored from above with precision-rolled threaded steel nuts. The anchor beams are longitudinally installed on the top surfaces of the upper shoulder beams at the web and the upper shoulder beams at the bottom plate. The precision-rolled threaded steel sleeves and precision-rolled threaded steel nuts are symmetrically arranged with the multiple anchor beams and longitudinally installed on the top surfaces of the upper shoulder beams at the web and the upper shoulder beams at the bottom plate. The support preloading device is installed on the pier body, and multiple pier bodies are symmetrically and evenly spaced on the box girder to be cast. When the support is preloaded, the anchoring system anchors the counter-pressure device, and the jack applies oil pressure synchronously. The output preloading load of the jack is controlled by the oil pressure gauge. The preloading load is transmitted downward through the force transmission system and acts evenly on the support system. By adjusting the oil pressure gauge reading, the preloading load is loaded to each level to achieve support preloading.

2. The support preloading device based on pier top prestressing according to claim 1, characterized in that: The support system is modular and connected to the force transmission system.

3. The support preloading device based on pier top prestressing according to claim 1, characterized in that: The pier body serves as the support for the bracket preloading device.

4. A construction method using the support preloading device based on pier top prestressing according to any one of claims 1 to 3, characterized in that Including steps: Step 1: After installing the bracket of the bracket system, lay the bottom formwork on the bracket; Step 2: Lay the web plate, bottom plate pad beam and distribution beam on the bottom form in sequence; Step 3: Install the upper shoulder beams at the web and bottom plates, the jacks, and the lower shoulder beams at the web and bottom plates at the prestressed position on the pier top in sequence; Step 4: Pass the anchor beam through the prestressed opening on the pier top, place it on the upper shoulder beam at the web and the upper shoulder beam at the bottom plate, install the precision-rolled threaded steel nuts, and anchor the anchor beam; Step 5: The jack applies oil pressure synchronously, and the output force of the jack is controlled by the oil pressure gauge to preload the bracket in stages, and the deformation value of the bracket is recorded during the preloading process; Step 6: After the pre-stressing is completed, remove the bracket pre-stressing device from top to bottom, adjust the template elevation, and proceed to the next construction process.

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