CN109944170A - Integrated construction system and construction method of cast-in-place section and closed section of high pier continuous beam side span - Google Patents

Abstract

The present invention relates to technical field of building construction, more particularly to continuous beam with high-pier end bay Cast-in-Situ Segment and closure section integrated construction system and construction method, specific steps are as follows: preparation of construction → construction monitoring calculates analysis → cantilever construction to closure section and the transformation of access bridge construction → hanging basket advancing and platform hanging basket, precompressed → end bay cast-in-place section construction → end bay closure section construction → end bay closure section tensioning → and hangs platform system and remove.It is compared with the traditional method, effectively solves the problems, such as that high pier bracket is set up, avoid a large amount of bracket erection constructions, system stress is hung using Hanging Basket, construction technology is simple, reduces materials'use amount, reduces the use of Large-scale Hoisting equipment, simultaneously for work such as bracket that may be present processing, it with save the cost, saves the duration, Technical Economy preferably waits clear superiorities, and avoiding conventional construction bracket sets up, and the work such as a large amount of based process are avoided, the duration saves apparent.

Description

Integrated construction system and construction method of cast-in-place section and closed section of high pier continuous beam side span

technical field

The invention relates to the technical field of building construction, in particular to a construction method of an integrated construction system of a cast-in-situ section and a closed section of a continuous beam side span of a high pier, which is suitable for the construction of the cast-in-situ section of the side span of the hanging basket cantilever construction and the bracketless construction of the closed section.

Background technique

With the rapid advancement of infrastructure construction in my country, a large number of bridge projects have emerged, and long-span continuous girder bridges are one of the main bridge forms at present. For such bridges, prefabricated beam structures are usually used in the non-main span, continuous beams in the main span, and cantilevered construction using hanging baskets. Hanging basket construction is very common in the continuous beam side-span closed section and the high pier construction in the cast-in-place section, and the generally adopted construction method is cast-in-place brackets. However, the pier column is high, the support is more difficult to erect, the hoisting is difficult, the slenderness and stability of the support become worse, and more materials need to be added. At the same time, the difficulty of erecting the support has the problem of foundation treatment, the cost increases and the construction period becomes longer.

SUMMARY OF THE INVENTION

In view of the problems existing in the prior art, the present invention provides a construction method for the integrated construction system of the cast-in-place section and the closed section of the continuous beam side span of the high pier, which is convenient for construction, effectively solves the problem of erecting high pier supports, and avoids a large number of support erection works. The hanging basket hanging system is used for stress, and the construction technology is simple.

For realizing the above-mentioned technical purpose, the technical scheme adopted in the present invention is as follows:

The integrated construction system of the side span cast-in-place section and the closing section of the continuous beam of the high pier includes the side span pier body, the mid-span pier body closest to the side span pier body, the constructed beam erected on the side span pier body, and the mid-span pier erected on the side span pier body. The continuous beam on the body and close to the side of the constructed beam is characterized in that: it also includes a hanging basket, a bottom plate longitudinal beam and a bottom plate cross beam, the hanging basket is installed on the continuous beam, and one end of the bottom plate longitudinal beam is erected on the side span The pier body and the other end are erected on the hanging basket, the bottom plate beam is erected at the bottom of the bottom plate longitudinal beam, and the cast-in-place section and the closing section are cast on the bottom plate longitudinal beam and are located in the space between the constructed beam and the continuous beam .

It is further defined that the bottom plate longitudinal beams and the bottom plate transverse beams are located at the lower edges of the constructed beams and the continuous beams, and a wing guide beam directly above the bottom plate longitudinal beams is also erected at the upper edges of the constructed beams and the continuous beams.

For the integrated system of the cast-in-place section and the closed section of the continuous beam side span of the high pier, the specific construction method includes the following steps:

①Construction preparation: According to the conventional preparation method, the construction technical plan is initially drawn up, the temporary support system is arranged, the temporary load is counted, and the stress state of the beam body under the suspended load is analyzed according to the calculation to obtain the technical support of the relevant departments. , prepare a special construction plan, complete the construction of the approach bridge in the cast-in-situ section of the side span, provide the fulcrum of the cast-in-place section of the side span and the closing section, complete the approval procedures, and do a good job of technical disclosure before the start of construction;

②Construction monitoring calculation and analysis: According to the design of the side span cast-in-place and the closing plan, 1/2 of the weight of the cast-in-place section of the hanging basket will act on the cantilever end of the continuous beam, and the influence on the internal force of the bridge will be analyzed under the condition of increasing the load on the cantilever end, and the counterweight plan will be determined. ,

According to the side span cast-in-situ and the closing plan design, 1/2 of the sum of the weight of the hanging basket closing casting section + cast-in-place section will act on the cantilever end of the continuous beam, and the influence on the internal force of the bridge will be analyzed under the condition of increasing the load on the cantilever end, and the counterweight will be determined. Program,

Analysis of the influence of the load of the side span cast-in-place section and the side span closed section of the approach bridge hanging on the internal force of the bridge;

③ Cantilever construction to Helong section and approach bridge construction: After the construction of the 0# block on the top of the main pier is completed, the cantilever is poured symmetrically on both sides. The cantilever construction of the cantilevered beam section is constructed by hanging basket cantilever construction. After the cantilever construction of one of the main piers is completed, retreat in time. The mid-span hanging basket provides working space for the rear cantilever construction hanging basket on the other side. During the construction of the last cantilevered section, it is necessary to appropriately enlarge the holes through which the hanging rods of the hanging basket pass through the box girder to ensure that when the box girder is deformed, the hanging The rod can move freely forward and backward in the hole of the box girder. During the construction of the approach bridge, the hanging rod holes are reserved on the approach bridge wing plate and the top plate as the support of the inner longitudinal beam of the hanging basket and the lower longitudinal beam of the wing plate;

④Forward movement of the hanging basket and reconstruction and preloading of the hanging basket platform: After the cantilever construction of the hanging basket is completed, move it forward to the end of the cantilever segment, adjust the longitudinal beam of the hanging basket to the same elevation as the top surface of the side pier, and check whether the length of the longitudinal beam is Meet the casting length of the cast-in-situ section and the closing section of the side span, and connect the longitudinal beam if the height is not satisfied; extend the front and lower beams of the hanging basket to the pier, and then install the hanging basket longitudinal beam on the pier and then remove the front beam. The hanging basket moves and adjusts the position of the longitudinal beams to meet the lap requirements. The outer support beam and inner roof support beam of the side span cast-in-situ section and the closing section of the wing are suspended from the approach bridge wing and inner roof by fine-rolled threaded steel bars; the cantilever hanging basket is removed. When it is necessary to erect the side-span closed section brackets and install the formwork, remove the construction materials and equipment from the box top and the box, and place the materials and equipment used for the closed section construction on the pier top in an orderly manner;

After the installation of the hanging basket transformation platform is completed, the whole system is pre-pressed, and the side span construction section is stacked with steel and 1t/bag of sandbags. %→60%→80%→100%→120% load step by step, the other end of the T structure is balanced by the water tank;

⑤ Construction of the cast-in-situ section of the side span: the bottom plate of the construction platform of the cast-in-place section of the side span is supported by the hanging basket longitudinal beam on the side pier and the hanging basket cantilever construction section, and the wing plate is supported on the longitudinal hanging beam. , First install the bottom form and side formwork, adjust the position and elevation of the formwork, install the inner support, the inner form In the cast-in-situ section of the side span, the anchors are embedded according to the design to realize single-end tensioning;

During the construction of the cast-in-situ section of the side span, the cantilever end of the side span shall be weighed, and the counterweight shall be carried out on the side of the mid-span according to the design and monitoring requirements. There is no change. The counterweight of the side span cantilever end and the mid-span closed end are all weighed by the water tank set at the side span cantilever end. The weight of the water tank is 1/2 of the cast-in-place end of the side span. For brick or iron welded water tanks, when the cast-in-place section of the side span is poured, the water tank in the middle span is not waterproof and unloaded, and only the cantilever end of the side span is discharged with water for unloading;

⑥ Construction of the side span closure section: install the mid-span closure hanger → rebar binding → prestressed pipeline installation → closure lock, remove side hole brackets, remove the temporary horizontal restraint of the middle fulcrum → select the lowest temperature time of the day to pour concrete → pour concrete At the same time, the counterweight of the water tank is removed step by step → the prestressed tensioning, anchoring, and grouting of the closed section are completed for construction. The cantilever end of the closed section and the cast-in-place section of the side span should be temporarily connected to avoid the concrete in the closed section during the pouring and early hardening process. There are obvious volume changes in the construction, the locking time is carried out according to the locking design of the closing section, and the construction support rigid frame adopts "pre-embedded anchor bolts + connection rigid I-beam frame + pre-embedded anchor bolts";

⑦ Tensioning of side-span closing section: According to the design and arrangement of the construction organization, the prestress is adjusted in advance to be a single-end tensioning process. During the construction of the cast-in-place section, the tensioning position of the anchor plate is buried, and the anchoring end is installed and tensioned at both ends For the anchorage, the steel strand is used to pass through the anchorage, and a single tensioning jack is used at the other end for pre-tensioning, and finally the whole bundle is tensioned with a jack that adapts to the specification;

⑧Removal of the hanging platform system: After the construction of the side span closure is completed, according to the specific force requirements of the middle span closure, the prestressed grouting shall be removed after the design requirements are met. When the lifting platform is removed, the hanging system shall be loosened first, and it shall be supported on the side pier. The lowering and unloading device is lowered under the longitudinal beam of the hanging basket, and the bottom formwork is disengaged. The bottom beam and longitudinal beam of the hanging basket are gradually lowered to the ground by the winch. Crane dismantling, among which, when dismantling, follow the principle of "support first and then dismantle, and then dismantle first".

According to the above comprehensive comparison with the prior art, this construction method has the following advantages:

1. The construction is convenient, effectively solves the problem of erecting high pier supports, avoids a large number of supports erecting works, adopts the hanging basket hanging system to bear the force, and the construction technology is simple.

2. Good technical economy: This method reduces the amount of material used, reduces the use of large-scale hoisting equipment, and at the same time has obvious advantages such as cost saving, construction period saving, and better technical economy for possible bracket handling and other work.

3. The construction period is saved and the efficiency is improved: The integrated non-support construction method of the cast-in-place section and the closed section of the continuous beam side span of the high pier avoids the erection of conventional construction supports, and avoids a lot of foundation treatment work, and the construction period saving is obvious.

Description of drawings

Figure 1 is a schematic diagram of the main view structure of the integrated construction system of the cast-in-place section and the closed section of the continuous beam side span of the high pier;

Figure 2 is a schematic flow chart of the construction method of the integrated construction system of the cast-in-place section and the closed section of the high pier continuous beam side span;

The corresponding signs in the figure are: 1-side-span pier body, 2-middle-span pier body, 3-constructed beam, 4-continuous beam, 5-hanging basket, 6-floor longitudinal beam, 7-floor beam, 8- Wing guide beam.

Detailed ways

In order for those skilled in the art to better understand, the technical solutions of the present invention are further described below with reference to the accompanying drawings and embodiments.

As shown in Figure 1, the integrated construction system of the continuous beam side span cast-in-place section and the closing section of the high pier includes side span pier body 1, the mid-span pier body 2 closest to the side span pier body 1, and the side span pier body 2 erected on the side span pier body. The constructed beam 3 on the 1 and the continuous beam 4 erected on the mid-span pier body 2 and close to one side of the constructed beam 3 are characterized in that: it also includes a hanging basket 5, a bottom plate longitudinal beam 6 and a bottom plate cross beam 7. The hanging basket 5 is installed on the continuous beam 4, one end of the bottom plate longitudinal beam 6 is erected on the side span pier body 2, and the other end is placed on the hanging basket 5, and the bottom plate beam 7 is erected on the bottom of the bottom plate longitudinal beam 6. , the cast-in-place section and the closed section are cast on the bottom longitudinal beam 6 and in the space between the constructed beam 3 and the continuous beam 4 . The bottom plate longitudinal beam 6 and the bottom plate transverse beam 7 are located at the lower edge of the constructed beam 3 and the continuous beam 4, and a wing plate guide directly above the bottom plate longitudinal beam 6 is also erected at the upper edge of the constructed beam 3 and the continuous beam 4. Beam 8.

Its specific construction method includes the following steps:

①Construction preparation: According to the conventional preparation method, the construction technical plan is initially drawn up, the temporary support system is arranged, the temporary load is counted, and the stress state of the beam body under the suspended load is analyzed according to the calculation to obtain the technical support of the relevant departments. , prepare a special construction plan, complete the construction of the approach bridge in the cast-in-situ section of the side span, provide the fulcrum of the cast-in-place section of the side span and the closing section, complete the approval procedures, and do a good job of technical disclosure before the start of construction;

②Construction monitoring calculation and analysis: According to the design of the side span cast-in-place and the closing plan, 1/2 of the weight of the cast-in-place section of the hanging basket will act on the cantilever end of the continuous beam, and the influence on the internal force of the bridge will be analyzed under the condition of increasing the load on the cantilever end, and the counterweight plan will be determined. ,

According to the side span cast-in-situ and the closing plan design, 1/2 of the sum of the weight of the hanging basket closing casting section + cast-in-place section will act on the cantilever end of the continuous beam, and the influence on the internal force of the bridge will be analyzed under the condition of increasing the load on the cantilever end, and the counterweight will be determined. Program,

Analysis of the influence of the load of the side span cast-in-place section and the side span closed section of the approach bridge hanging on the internal force of the bridge;

③ Cantilever construction to Helong section and approach bridge construction: After the construction of the 0# block on the top of the main pier is completed, the cantilever is poured symmetrically on both sides. The cantilever construction of the cantilevered beam section is constructed by hanging basket cantilever construction. After the cantilever construction of one of the main piers is completed, retreat in time. The mid-span hanging basket provides working space for the rear cantilever construction hanging basket on the other side. During the construction of the last cantilevered section, it is necessary to appropriately enlarge the holes through which the hanging rods of the hanging basket pass through the box girder to ensure that when the box girder is deformed, the hanging The rod can move freely forward and backward in the hole of the box girder. During the construction of the approach bridge, the hanging rod holes are reserved on the approach bridge wing plate and the top plate as the support of the inner longitudinal beam of the hanging basket and the lower longitudinal beam of the wing plate;

④Forward movement of the hanging basket and reconstruction and preloading of the hanging basket platform: After the cantilever construction of the hanging basket is completed, move it forward to the end of the cantilever segment, adjust the longitudinal beam of the hanging basket to the same elevation as the top surface of the side pier, and check whether the length of the longitudinal beam is Meet the casting length of the cast-in-situ section and the closing section of the side span, and connect the longitudinal beam if the height is not satisfied; extend the front and lower beams of the hanging basket to the pier, and then install the hanging basket longitudinal beam on the pier and then remove the front beam. The hanging basket moves and adjusts the position of the longitudinal beams to meet the lap requirements. The outer support beam and inner roof support beam of the side span cast-in-situ section and the closing section of the wing are suspended from the approach bridge wing and inner roof by fine-rolled threaded steel bars; the cantilever hanging basket is removed. When it is necessary to erect the side-span closed section brackets and install the formwork, remove the construction materials and equipment from the box top and the box, and place the materials and equipment used for the closed section construction on the pier top in an orderly manner;

After the installation of the hanging basket transformation platform is completed, the whole system is pre-pressed, and the side span construction section is stacked with steel and 1t/bag of sandbags. %→60%→80%→100%→120% load step by step, the other end of the T structure is balanced by the water tank;

⑤ Construction of the cast-in-situ section of the side span: the bottom plate of the construction platform of the cast-in-place section of the side span is supported by the hanging basket longitudinal beam on the side pier and the hanging basket cantilever construction section, and the wing plate is supported on the longitudinal hanging beam. , First install the bottom form and side formwork, adjust the position and elevation of the formwork, install the inner support, the inner form In the cast-in-situ section of the side span, the anchors are embedded according to the design to realize single-end tensioning;

During the construction of the cast-in-situ section of the side span, the cantilever end of the side span shall be weighed, and the counterweight shall be carried out on the side of the mid-span according to the design and monitoring requirements. There is no change. The counterweight of the side span cantilever end and the mid-span closed end are all weighted by the water tank set at the side span cantilever end. For brick or iron welded water tanks, when the cast-in-place section of the side span is poured, the water tank in the middle span is not waterproof and unloaded, and only the cantilever end of the side span is discharged with water for unloading;

⑥ Construction of the side span closure section: install the mid-span closure hanger → rebar binding → prestressed pipeline installation → closure lock, remove side hole brackets, remove the temporary horizontal restraint of the middle fulcrum → select the lowest temperature time of the day to pour concrete → pour concrete At the same time, the counterweight of the water tank is removed step by step → the prestressed tensioning, anchoring, and grouting of the closed section are completed for construction. The cantilever end of the closed section and the cast-in-place section of the side span should be temporarily connected to avoid the concrete in the closed section during the pouring and early hardening process. There are obvious volume changes in the construction, the locking time is carried out according to the locking design of the closing section, and the construction support rigid frame adopts "pre-embedded anchor bolts + connection rigid I-beam frame + pre-embedded anchor bolts";

⑦ Tensioning of side-span closing section: According to the design and arrangement of the construction organization, the prestress is adjusted in advance to be a single-end tensioning process. During the construction of the cast-in-place section, the tensioning position of the anchor plate is buried, and the anchoring end is installed and tensioned at both ends For the anchorage, the steel strand is used to pass through the anchorage, and a single tensioning jack is used at the other end for pre-tensioning, and finally the whole bundle is tensioned with a jack that adapts to the specification;

⑧Removal of the hanging platform system: After the construction of the side span closure is completed, according to the specific force requirements of the middle span closure, the prestressed grouting shall be removed after the design requirements are met. When the lifting platform is removed, the hanging system shall be loosened first, and it shall be supported on the side pier. The lowering and unloading device is lowered under the longitudinal beam of the hanging basket, and the bottom formwork is disengaged. The bottom beam and longitudinal beam of the hanging basket are gradually lowered to the ground by the winch. Crane dismantling, among which, when dismantling, follow the principle of "support first and then dismantle, and then dismantle first".

The above provides a detailed introduction to the integrated construction system for high pier continuous beam side span cast-in-place section and closed section provided by the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (3)

1. continuous beam with high-pier end bay Cast-in-Situ Segment and closure section integrated construction system, including it is end bay pier shaft, nearest away from end bay pier shaft In across pier shaft, the construction beam being erected on end bay pier shaft and in being erected at across the company on pier shaft and close to construction beam side Continuous beam, it is characterised in that: further include Hanging Basket, underframe longitudinal member and floor beam, the Hanging Basket effect is mounted on continuous beam, described One end of underframe longitudinal member rides upon on end bay pier shaft, the other end rides upon on Hanging Basket, and the floor beam is erected at underframe longitudinal member Bottom, the Cast-in-Situ Segment and closure section are cast on underframe longitudinal member and in the spaces between construction beam and continuous beam.

2. continuous beam with high-pier end bay Cast-in-Situ Segment according to claim 1 and closure section integrated construction system, feature exist In: the underframe longitudinal member and floor beam are at the lower edge of construction beam and continuous beam, on construction beam and continuous beam Edge is also provided with the wing plate nose girder right above underframe longitudinal member.

3. the construction party of continuous beam with high-pier end bay Cast-in-Situ Segment according to claim 1 and closure section integrated construction system Method includes the following steps:

1. preparation of construction: according to conventional stand-by mode, tentatively drafting construction technical schemes, carry out temporary supporting system arrangement, system Temporary load(ing) situation is counted, the technology branch of relevant departments is obtained according to stress of the calculating analysis beam body under hoisted load It holds, is analyzed by calculating, work out special construction plan, complete the construction of end bay Cast-in-Situ Segment access bridge, end bay Cast-in-Situ Segment and closure are provided Duan Zhidian, and procedure of submitting reports for approval is completed, carry out the work of confiding a technological secret before going into operation；

2. construction monitoring calculates analysis: according to end bay is cast-in-place and joint scheme designs, 1/2 company of will act on of Hanging Basket Cast-in-Situ Segment weight Continuous girder cantilever end, in the case where cantilever end increases loading condition, analysis influences bridge internal force, determines counterweight scheme,

According to end bay is cast-in-place and joint scheme design, Hanging Basket closure pours the 1/2 of the sum of section+Cast-in-Situ Segment weight and will act on continuous beam Cantilever end, in the case where cantilever end increases loading condition, analysis influences bridge internal force, determines counterweight scheme,

Access bridge hangs the impact analysis of end bay Cast-in-Situ Segment and end bay closure section load to bridge internal force；

3. cantilever construction to closure section and access bridge is constructed: after by the construction of main pier pier top 0# block, then the symmetrical cantilever pouring in two sides, The outstanding beam section that fills uses Hanging Basket cantilever construction, after the completion of one of them main pier cantilever construction, retreat in time in across Hanging Basket, be the other side Back boom construction hanging basket provides working space, in the last one cantilever segmental construction, needs each sunpender of Hanging Basket passing through box beam Hole suitably amplify, it is ensured that box beam deform when sunpender can in the hole of box beam front and back move freely, access bridge construct when in access bridge Sunpender hole is reserved on wing plate and top plate to support as stringer under stringer, wing plate inside Hanging Basket；

4. hanging basket advancing and platform hanging basket transformation, precompressed: boom segments end is moved forward to after the completion of Hanging Basket cantilever construction, by Hanging Basket Stringer be adjusted to it is consistent with abutment pier top surface absolute altitude locate, whether detection stringer length meets end bay Cast-in-Situ Segment and closure section pours length Degree, the spreading stringer in the ungratified situation of height；Lower beam before Hanging Basket is extended into bridge pier, then Hanging Basket stringer is ridden upon into bridge Front crossbeam is removed after on pier, and overlap joint is met by the mobile adjustment stringer position of Hanging Basket and is required, wherein end bay Cast-in-Situ Segment and closure Section wing plate outside-supporting beam and inside top plate supporting beam by finish rolling deformed bar are hung on access bridge wing plate and inner top panel；Remove cantilever When Hanging Basket, end bay closure section bracket and installation template are set up, construction material, equipment in removing case top, case are applied for closure section The material and facility of work is put in an orderly manner to pier top；

Hanging Basket is transformed after the completion of stage+module, carries out precompressed to whole system, end bay construction section uses steel and 1t/ bags of sandbag Common preloading carries out preloading according to the sequence of bottom plate, web, top plate and wing plate, wherein by 40% → 60% → 80% → 100% → The other end of 120% multistage loadings, T structure is balanced ballast by water tank；

5. end bay cast-in-place section construction: end bay cast-in-place section construction platform floor is supported on abutment pier by Hanging Basket stringer and Hanging Basket cantilever is applied Workshop section, wing plate are supported on longitudinal hanging beam, and when end bay cast-in-place section construction, installation bed die and side form first adjust template Position and absolute altitude carry out the installation at bottom, abdomen, top and diaphragm plate reinforcing bar, bellows after installation inner support, internal model and sealing end mould, most After-pouring concrete, according to embedded anchorage is designed, realizes one-end tension when constructing end bay Cast-in-Situ Segment；

In end bay cast-in-place section construction, need to end bay cantilever end carry out ballast, and according to design and monitoring requirement in across side into Row counterweight, when Cast-in-Situ Segment pours concrete, cantilever end, which synchronizes, to discharge water, to keep cantilever end elevation not change, end bay cantilever end with Midspan closing end counterweight is all made of water tank and the mode that end bay cantilever end carries out ballast is arranged in, and wherein the weight of water tank is existing for end bay Pour end and pour the 1/2 of weight, wherein water tank welds water tank using brick or irony, when end bay Cast-in-Situ Segment pours, in across water tank not Waterproof unloading, only end bay cantilever end discharges water unloading；

6. end bay closure section construction: being locked according to midspan closing hanger installation → reinforcing bar binding → prestress pipe installation → closure It is fixed, remove lateral opening bracket, remove central bearing point horizontal direction temporary constraint → selection on the day of minimum temperature time casting concrete → Removal water tank ballast → closure section prestressed stretch-draw, anchoring, grouting finish step by step while casting concrete sequence carries out Construction, closure pour cantilever end and should temporarily connect with end bay Cast-in-Situ Segment, and the section concrete that avoids joining the two sections of a bridge, etc is pouring and premature cure mistake Apparent volume change occurs in journey, locking time is executed by closure section locking design, and Construction Support stiff skeleton is using " pre-buried The bold property I-shaped steel skeleton+pre-embedded anchoring bolts of foundation bolt+connection "；

7. end bay closure section tensioning: according to Design of Construction Organization arrangement, adjusting prestressing force in advance is one-end tension technique, cast-in-place Embedded anchor plate tensioning position, installs both ends tension ground tackle for anchored end after lashing when section construction, passes through anchorage using steel strand wires, And pre-tightened in the other end using single tendon stretch jack, entire beam tension is finally carried out using the jack for adapting to specification；

8. hanging platform system dismounting: after end bay closure is constructed, according to the stress specific requirement of midspan closing, prestressed grouting Platform is hung in dismounting after reaching design requirement, is hung platform and is unclamped hangar system first when removing, is supported on the Hanging Basket stringer of abutment pier Lower reduction lowering device is disengaged end template, is gradually transferred Hanging Basket floor beam, stringer to ground, Hanging Basket master using hoist engine Truss is moved to the 0# sections of enough positions of Lifting Capacity by walking line mode, and is removed using loop wheel machine, wherein when removing, it then follows The principle of " first prop up and tear open afterwards, rear branch is first torn open ".