阅读说明：本技术 用于沉管预制顶板钢筋体系转换的施工方法及系统 (Construction method and system for conversion of immersed tube prefabricated top plate steel bar system ) 是由 孙晓伟 冯先导 曾波存 陈金元 余登文 王聪 穆清君 徐彬彬 朱金波 张海川 刘 于 2020-05-21 设计创作，主要内容包括：本发明公开了一种用于沉管预制顶板钢筋体系转换的施工方法及系统,其特征在于,包括以下步骤：步骤1、节段n外模脱模前施工；步骤2、节段n+1顶板体系转换施工；步骤3、节段n+1合模施工。本发明采用钢筋台车提前绑扎顶板钢筋,通过体系转换,减少了关键线路工作,有效缩短了关键线路施工时间,保证了沉管全断面施工且相邻节段纵向主筋通长连接,提高了施工质量,降低了沉管渗水风险。(The invention discloses a construction method and a system for conversion of a immersed tube prefabricated roof steel bar system, which are characterized by comprising the following steps of: step 1, constructing a section n before demolding of an outer mold; step 2, converting and constructing a segment n +1 top plate system; and step 3, carrying out die assembly construction on the segment n + 1. According to the invention, the top plate steel bars are bound in advance by the steel bar trolley, and through system conversion, the work of key lines is reduced, the construction time of the key lines is effectively shortened, the full-section construction of the immersed tube is ensured, the longitudinal main bars of adjacent sections are connected in a full-length mode, the construction quality is improved, and the water seepage risk of the immersed tube is reduced.)

1. A construction method for conversion of a immersed tube precast top plate steel bar system is characterized by comprising the following steps:

step 1, construction before demoulding of segment n external mold

Step 1.1, after the segment n +1 bottom plate steel bars and the vertical wall steel bars are bound, installing a middle pipe gallery supporting framework, wherein the root of the middle pipe gallery supporting framework is connected with the mid-partition wall framework, and the central line of the supporting framework coincides with the central line of the immersed tube.

Step 1.2, disassembling the steel bar trolley at the n-position of the segment, adjusting the steel bar trolley to a demoulding state, and moving the steel bar trolley to the n +1 position of the segment where the bottom plate steel bars and the vertical wall steel bars are bound to be in place for binding the top plate steel bars;

step 1.3, hanging a plurality of rows of chain blocks below a top truss of the external mold trolley with the poured segment n;

step 1.4, hanging a plurality of hanging beams below each row of chain blocks, connecting the hanging beams, and adjusting the chain blocks to be horizontal to the hanging beams;

step 2, segment n +1 top plate system conversion construction

Step 2.1, after the top plate steel bars of the segment n +1 are bound, the outer mold trolley at the segment n is adjusted to a demolding state,

running to the position of the section n +1 reinforcement cage, and hanging a steel wire rope binding and fastening device at the lower part of each hanging beam;

2.2, connecting the reinforcement cage with the hanging beam by using a steel wire rope to ensure that the hanging beam holds force;

step 2.3, adjusting the gallery trolley at the segment n to a demoulding state, and driving to the reinforcement cage at the segment n + 1;

2.4, moving out the segment n +1 reinforcement cage after the segment n +1 reinforcement trolley is separated from the reinforcement cage;

2.5, when the steel bar trolley at the segment n +1 moves out of the segment n +1, adjusting the internal mold trolley at the segment n to a contraction state, and simultaneously moving the steel bar trolley into the steel bar cage at the segment n +1 for measurement and positioning; step 3, segment n +1 die assembly construction

Step 3.1, removing the steel wire rope and the steel wire rope binding and fastening device, and lifting the hanging beam to the highest point;

and 3.2, mounting an end die, and fixedly connecting the end die with the inner die and the outer die to carry out die assembly.

2. The construction method for conversion of the immersed tube precast roof slab steel bar system according to claim 1, wherein the steel bar trolley, the internal mold trolley and the pipe gallery trolley are hydraulic walking structures.

3. The construction method for conversion of the immersed tube precast top plate steel bar system according to claim 1, wherein the steel wire rope binding and fastening device is a turn buckle.

4. The construction method for conversion of the immersed tube precast top plate steel bar system according to claim 1, wherein the step 1.2 is specifically as follows: after the segment n +1 bottom plate and the vertical wall steel bars are bound, disassembling a support screw rod of the steel bar trolley at the segment n, contracting a support oil cylinder of the steel bar trolley, and adjusting to a demoulding state; moving the steel bar trolley to a segment n +1, completely landing a movable supporting leg and a fixed supporting leg of the steel bar trolley, debugging the steel bar trolley, feeding oil to a supporting oil cylinder, measuring and positioning, and increasing the elevation of the top surface of the steel bar trolley in advance of design so as to enable the elevation of the transformed steel bar cage system to be consistent with the design;

after the steel bar trolley is in place, a support screw rod of the steel bar trolley is fastened, top plate steel bars of the sections n +1 are bound, longitudinal main bars of the sections n +1 are connected with exposed steel bars of the sections n, high-strength cushion blocks are supported at the bottoms of the top plate steel bars and bound with the steel bars firmly, and binding of the top plate steel bars of the sections n +1 is completed before outer molds of the sections n are modified and demolded.

5. The construction method for conversion of the immersed tube precast top plate steel bar system according to the claim 1 or 4, characterized in that a stiff skeleton is arranged in the top plate steel bar, and the longitudinal spacing of the stiff skeleton is consistent with the spacing of lifting lugs at the bottom of the hanging beam.

6. The construction method for conversion of the immersed tube precast top plate steel bar system according to claim 1, wherein the step 2.3 is specifically as follows: disassembling a support screw rod of the gallery trolley, withdrawing a support oil cylinder and a jacking oil cylinder of the gallery trolley for demoulding, and enabling a fixed supporting leg and a movable supporting leg of the gallery trolley to enter a steel reinforcement cage of the segment n +1 by a mutual leg-falling method; after the gallery trolley is in place, the movable supporting leg and the fixed supporting leg of the gallery trolley are completely landed, the supporting oil cylinder and the jacking oil cylinder of the gallery trolley are used for supplying oil, the measurement and debugging are carried out, and the supporting screw rod of the gallery trolley is fastened, so that the gallery trolley is attached to the high-strength cushion block of the supporting cushion at the bottom of the top plate steel bar.

7. The construction method for conversion of the immersed tube precast top plate steel bar system according to claim 1, wherein the step 2.4 is specifically as follows: the supporting screw rod of the steel bar trolley at the segment n +1 position is disassembled, the supporting oil cylinder and the jacking oil cylinder of the steel bar trolley slowly return oil, after the top surface of the steel bar trolley is separated from the steel bar cage, the oil return is stopped, whether the hanging beam, the chain block, the steel wire rope binding and fastening device, the steel bar cage and the outer die truss are deformed or damaged is checked, after the check is qualified, the supporting oil cylinder and the jacking oil cylinder of the steel bar trolley continue to return oil, the steel bar trolley is completely separated, and the steel bar trolley is driven out of the segment n +1 steel bar.

8. The utility model provides a construction system that is used for immersed tube precast roof steel bar system to change which characterized in that includes: the system comprises an outer die trolley, an inner die trolley, a gallery trolley, a steel bar trolley and a lifting appliance for system conversion;

the inner mould trolley, the gallery trolley and the steel bar trolley are pushed by respective hydraulic systems and walk in a mutually leg-falling mode through respective fixed supporting legs and movable supporting legs, and the inner mould trolley, the gallery trolley and the steel bar trolley are respectively provided with a self-retractable supporting oil cylinder and a self-retractable supporting screw rod;

the outer mold trolley comprises an outer mold top layer truss, a track and a traveling mechanism; the tracks are arranged on two sides of the immersed tube, the walking mechanism drives the outer mold trolley to walk on the tracks, and the outer mold top layer truss is provided with lifting points;

the lifting appliance comprises a lifting beam for distributing stress of the reinforcement cage, a chain block for adjusting the height of the lifting beam, a steel wire rope binding and fastening device for connecting the lifting beam and the reinforcement cage and a steel wire rope;

the top of hanging beam has laid a plurality of top lugs, and its position of laying is unanimous with external mold top layer truss hoisting point, a plurality of bottom lugs have been laid to the bottom of hanging beam equidistant, top lug and bottom lug both sides all are provided with the stiffening plate.

Technical Field

The invention relates to the field of immersed tube tunnel construction. More particularly, the invention relates to a construction method and a system for conversion of a immersed tube prefabricated roof steel bar system.

Background

The immersed tube tunnel is used as a structure for crossing the river across the sea, and can be used for tunnel construction in relatively weak foundation conditions, earthquake active areas, inland and marine environments, urban areas with limited operation and environment sensitive areas. At present, immersed tube prefabrication mainly comprises layered prefabrication and full-section prefabrication, and the full-section prefabrication method gradually becomes a preferred method for immersed tube prefabrication due to the advantages of small quantity of construction joints, low water seepage risk and the like. According to the immersed tube prefabricating process, the construction of the top plate steel bar has great influence on the full-section prefabricating construction period.

At present, in immersed tube full-section prefabrication construction, top plate steel bars are bound mainly by an internal mold trolley or a steel bar trolley. Roof steel bars are bound by means of an internal mold trolley, the binding is carried out only after the last section of concrete reaches the stripping strength, the internal mold is demoulded in place, the roof steel bar plates occupy key lines, the construction efficiency is slow, and the construction period is severely limited; the sink pipe of the HongZhu Australian bridge adopts an industrial section matching prefabrication method, a large number of sliding systems are arranged in a factory, reinforcing steel bars of a bottom plate, a side wall and a top plate are bound according to sections in a partitioning mode, adjacent sections of the sink pipe are of semi-rigid structures, longitudinal main reinforcements are disconnected and not connected, and a reinforcing cage slides after the sections are bound. And (4) binding the top plate steel bars by using a steel bar platform, then sliding the whole steel bar cage to a concrete pouring area, and then carrying out system conversion. For the immersed tube full-section prefabrication project of longitudinal main reinforcement full-length connection among the segments, the prefabrication pedestals are all provided with sliding systems, the cost is too high, and the quality of adjacent segment steel bar joints cannot be guaranteed after the steel bar cage is pushed and slid, so that the industrialized segment matching prefabrication construction process cannot meet the requirements.

Disclosure of Invention

The invention aims to provide a construction method for conversion of a immersed tube prefabricated top plate steel bar system, and solves the problem of construction of immersed tube full-section prefabricated top plate steel bars.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a construction method for conversion of a steel reinforcement system for a sinking pipe precast roof, comprising the steps of:

step 1, construction before demoulding of segment n external mold

Step 1.1, after the segment n +1 bottom plate steel bars and the vertical wall steel bars are bound, installing a middle pipe gallery supporting framework, wherein the root of the middle pipe gallery supporting framework is connected with the mid-partition wall framework, and the central line of the supporting framework coincides with the central line of the immersed tube.

Step 1.2, disassembling the steel bar trolley at the n-position of the segment, adjusting the steel bar trolley to a demoulding state, and moving the steel bar trolley to the n +1 position of the segment where the bottom plate steel bars and the vertical wall steel bars are bound to be in place for binding the top plate steel bars;

step 1.3, hanging a plurality of rows of chain blocks below a top truss of the external mold trolley with the poured segment n;

step 1.4, hanging a plurality of hanging beams below each row of chain blocks, connecting the hanging beams, and adjusting the chain blocks to be horizontal to the hanging beams;

step 2, segment n +1 top plate system conversion construction

2.1, after the top plate steel bars of the section n +1 are bound, adjusting an outer mold trolley at the section n to a demolding state, driving to a reinforcement cage of the section n +1, and hanging a steel wire rope binding and fastening device at the lower part of each hanging beam;

2.2, connecting the reinforcement cage with the hanging beam by using a steel wire rope to ensure that the hanging beam holds force;

step 2.3, adjusting the gallery trolley at the segment n to a demoulding state, and driving to the reinforcement cage at the segment n + 1;

2.4, moving out the segment n +1 reinforcement cage after the segment n +1 reinforcement trolley is separated from the reinforcement cage;

2.5, when the steel bar trolley at the segment n +1 moves out of the segment n +1, adjusting the internal mold trolley at the segment n to a contraction state, and simultaneously moving the steel bar trolley into the steel bar cage at the segment n +1 for measurement and positioning;

step 3, segment n +1 die assembly construction

Step 3.1, removing the steel wire rope and the steel wire rope binding and fastening device, and lifting the hanging beam to the highest point;

and 3.2, mounting an end die, and fixedly connecting the end die with the inner die and the outer die to carry out die assembly.

Preferably, the steel bar trolley, the internal mold trolley and the pipe gallery trolley are of a hydraulic walking structure.

Preferably, the steel wire rope binding and fastening device is a turn buckle.

Preferably, the step 1.2 is specifically: after the segment n +1 bottom plate and the vertical wall steel bars are bound, disassembling a support screw rod of the steel bar trolley at the segment n, contracting a support oil cylinder of the steel bar trolley, and adjusting to a demoulding state; moving the steel bar trolley to a segment n +1, completely landing a movable supporting leg and a fixed supporting leg of the steel bar trolley, debugging the steel bar trolley, feeding oil to a supporting oil cylinder, measuring and positioning, and increasing the elevation of the top surface of the steel bar trolley in advance of design so as to enable the elevation of the transformed steel bar cage system to be consistent with the design;

after the steel bar trolley is in place, a support screw rod of the steel bar trolley is fastened, top plate steel bars of the sections n +1 are bound, longitudinal main bars of the sections n +1 are connected with exposed steel bars of the sections n, high-strength cushion blocks are supported at the bottoms of the top plate steel bars and bound with the steel bars firmly, and binding of the top plate steel bars of the sections n +1 is completed before outer molds of the sections n are modified and demolded.

Preferably, a strength type framework is arranged in the top plate steel bar, and the longitudinal distance of the strength type framework is consistent with the distance of lifting lugs at the bottom of the hanging beam.

Preferably, the step 2.3 is specifically: disassembling a support screw rod of the gallery trolley, withdrawing a support oil cylinder and a jacking oil cylinder of the gallery trolley for demoulding, and enabling a fixed supporting leg and a movable supporting leg of the gallery trolley to enter a steel reinforcement cage of the segment n +1 by a mutual leg-falling method; after the gallery trolley is in place, the movable supporting leg and the fixed supporting leg of the gallery trolley are completely landed, the supporting oil cylinder and the jacking oil cylinder of the gallery trolley are used for supplying oil, the measurement and debugging are carried out, and the supporting screw rod of the gallery trolley is fastened, so that the gallery trolley is attached to the high-strength cushion block of the supporting cushion at the bottom of the top plate steel bar.

Preferably, the step 2.4 is specifically: the supporting screw rod of the steel bar trolley at the segment n +1 position is disassembled, the supporting oil cylinder and the jacking oil cylinder of the steel bar trolley slowly return oil, after the top surface of the steel bar trolley is separated from the steel bar cage, the oil return is stopped, whether the hanging beam, the chain block, the steel wire rope binding and fastening device, the steel bar cage and the outer die truss are deformed or damaged is checked, after the check is qualified, the supporting oil cylinder and the jacking oil cylinder of the steel bar trolley continue to return oil, the steel bar trolley is completely separated, and the steel bar trolley is driven out of the segment n +1 steel bar.

The invention also provides a construction system for conversion of the immersed tube prefabricated roof steel bar system, which comprises the following components: the system comprises an outer die trolley, an inner die trolley, a gallery trolley, a steel bar trolley and a lifting appliance for system conversion;

the inner mould trolley, the gallery trolley and the steel bar trolley are pushed by respective hydraulic systems and walk in a mutually leg-falling mode through respective fixed supporting legs and movable supporting legs, and the inner mould trolley, the gallery trolley and the steel bar trolley are respectively provided with a self-retractable supporting oil cylinder and a self-retractable supporting screw rod;

the outer mold trolley comprises an outer mold top layer truss, a track and a traveling mechanism; the tracks are arranged on two sides of the immersed tube, the walking mechanism drives the outer mold trolley to walk, and the outer mold top layer truss is provided with lifting points;

the lifting appliance comprises a lifting beam for distributing stress of the reinforcement cage, a chain block for adjusting the height of the lifting beam, a steel wire rope binding and fastening device for connecting the lifting beam and the reinforcement cage and a steel wire rope;

the top of hanging beam has laid a plurality of top lugs, and its position of laying is unanimous with external mold top layer truss hoisting point, a plurality of bottom lugs have been laid to the bottom of hanging beam equidistant, top lug and bottom lug both sides all are provided with the stiffening plate.

The invention at least comprises the following beneficial effects:

1. adopt reinforcing bar platform truck ligature roof reinforcing bar in advance, through the system conversion, reduced key line work, effectively shortened key line engineering time, guaranteed immersed tube full section construction and adjacent section vertical main muscle lead to long the connection, improved construction quality, reduced immersed tube infiltration risk.

2. The prefabricated time of a single immersed tube standard segment is greatly shortened, the template trolley and the steel bar trolley can be used in a circulating sequence, the installation and the operation are convenient, the working efficiency is high, the construction period is shortened, and the cost is obviously reduced.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a flow chart of the construction method for conversion of the immersed tube precast roof slab steel bar system of the present invention;

FIG. 2 is a schematic view of the construction system for conversion of the immersed tube precast roof slab steel bar system of the present invention;

FIG. 3 is a schematic view of a spreader of the present invention;

FIG. 4 is a schematic longitudinal sectional view of step 1 in example 1 of the present invention;

FIG. 5 is a schematic cross-sectional view of step 1 in example 1 of the present invention;

FIG. 6 is a schematic longitudinal sectional view of step 2 in example 1 of the present invention;

FIG. 7 is a schematic cross-sectional view of step 2 in example 1 of the present invention;

FIG. 8 is a schematic cross-sectional view of step 3 in example 1 of the present invention.

The device comprises a 1-outer die trolley, a 2-inner die trolley, a 3-gallery trolley, a 4-steel bar trolley, a 5-lifting appliance, a 6-lifting beam, a 6.1-double-spliced channel steel, a 6.2-top lifting lug, a 6.3-bottom lifting lug, a 6.4-stiffening plate, a 7-chain block, an 8-basket bolt, a 9-steel wire rope, a 10-fixed supporting leg, a 11-movable supporting leg, a 12-supporting oil cylinder, a 13-supporting screw rod, a 14-lifting oil cylinder, a 15-rail, a 16-walking mechanism, a 17-outer die top layer truss, an 18-middle pipe gallery supporting framework, a 19-middle partition wall framework, a 20-strength framework and a 21-end die.

Detailed Description

The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.

In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.