CN102953336A

CN102953336A - Modular construction method of cast-in-situ continuous box beam on deep soft foundation road segment

Info

Publication number: CN102953336A
Application number: CN201110253577XA
Authority: CN
Inventors: 谭世霖; 蒋雪琴; 林顺财; 包珍; 潘观强; 徐小庆
Original assignee: GUANGDONG HANGSHENG CONSTRUCTION GROUP CO Ltd
Current assignee: GUANGDONG HANGSHENG CONSTRUCTION GROUP CO Ltd
Priority date: 2011-08-30
Filing date: 2011-08-30
Publication date: 2013-03-06

Abstract

The invention relates to a modular construction method of a cast-in-situ continuous box beam on a deep soft foundation road segment; the modular construction method comprises the steps of prepressing a deep soft soil foundation by adopting concrete prefabricated square blocks and then setting up the full framing cast-in-situ continuous box beam on a hardened layer formed by laying concrete prefabricated plates; the modular construction method is developed on the basis of the conventional construction method and is characterized in that firstly the concrete prefabricated square blocks are used for prepressing the flattened foundation, after sedimentation is stable, the concrete prefabricated plates are laid on the ground surface to form the concrete hardened layer, then a full framing support is erected, and the concrete prefabricated square blocks are reused for carrying out support prepressing. The modular construction method has the advantages of greatly shortening the construction period, reducing the construction cost, effectively saving concrete resources required for conventionally constructing and paving the foundation hardened layer, being beneficial to environmental conservation and having better economic benefits and social benefits.

Description

The modular construction method of deep soft foundation highway section Cast-in-Situ Continuous Beam

Technical field

The present invention relates to a kind of on deep soft soil foundation the cast-in-place job practices of bridge continuous box girder, specifically utilize the precast concrete module to carry out the complete job practices that process on the stratum, belong to technical field of building construction.

Background technology

Continuous box girder is to adopt commonplace a kind of bridge construction in the highway, and in the continuous box girder cast-in-place construction in highway soft foundation highway section, the main employing expired hall formula steel pipe support method at present.Because full hall formula steel pipe support method is higher to the requirement for bearing capacity on basis, often ground needs the cast-in-situ concrete hardened layer to bind, and support is carried out the precompressed of long period, thereby cause the material turnover to utilize the cycle longer, and the concrete that binds can't reuse, and causes the serious wasting of resources and environment pollution.

The method of the more conventional precompressed of modular construction method and cast-in-situ concrete hardened layer greatly the reduction of erection time, is effectively saved the concrete resource, and reducing construction cost is beneficial to environmental protection, has preferably economic benefit and social benefit.

Summary of the invention

The objective of the invention is the deficiency for existing full hall formula steel pipe support method job practices, a kind of modular construction is provided.This job practices is developed on conventional construction method basis, the concrete prefabricated square of main employing carries out first precompressed to the ground after smooth, behind settlement stability, lay ground with concrete prefabricated plate again, form the hardening of concrete layer, then set up full framing, after bottom die of box-beam installs, carry out precompressed with concrete prefabricated square again.This modular construction method is the reduction of erection time greatly, reduces the pre-pressing bracket phase, improves material turnover utilization rate, and reducing construction cost is effectively saved the concrete resource, is beneficial to environmental protection, has preferably economic benefit and social benefit.

The modular construction method of deep soft foundation highway section Cast-in-Situ Continuous Beam, its technical process is as follows:

Suitably process on the top layer---rolls that---smooth---------------------bed die---with concrete prefabricated square precompressed support---is installed to be unloaded to set up support in joint filling to lay the concrete prefabricated chunk in smooth compacting in unloading to adopt concrete prefabricated square precompressed ground.

The Specific construction technological process is:

Carry out altering fill at fine day, filler is rock ballast soil, and thickness is 30-50cm, adopts road roller to roll, leveling, and both sides on construction ground, outside each 2m of continuous box girder projection line both sides, establish the gutter (wide * dark=0.6m * 0.6m).Adopt again concrete prefabricated square (the precompressed ground of size 90cm * 90cm * 90cm), the maximum load amount is 150% of case beam deadweight, the precompressed observation time is 7d, determine depending on ground settlement, ground day, settling amount must not be greater than 2.0mm (not containing measure error), settlement observation to ground day continuous three days of the rate of settling can unload less than 2mm/d.Tamp smooth after, lay the concrete prefabricated chunk and (be of a size of that 90cm * 90cm * 5cm), seam is filled and led up with mortar.(specification is: vertically * laterally=90cm * 60cm or 60cm * 60cm) to set up full framing, spread (the size 90cm * 90cm * 90cm) to pre-pressing bracket (heap(ed) capacity is case beam weight 100%) of recycling precast concrete square behind the bed die, the precompressed observation time is 3d, support day continuous two days of the rate of settling namely can unload less than 2mm/d.

The present invention compares with the conventional construction method and has the following advantages:

1, adopt the first precompressed ground of concrete prefabricated square, the precompressed support can effectively shorten the pre-pressing bracket time again, improves material turnover utilization rate, the reduction of erection time.

2, adopt concrete prefabricated plate to replace the cast-in-situ concrete hardened layer to bind, can effectively save the concrete resource, be beneficial to environmental protection, the reduction of erection time, have preferably Social benefit and economic benefit.

3, concrete prefabricated square and concrete prefabricated plate can be recycled, and reducing construction cost has preferably economic benefit greatly.

Description of drawings

Fig. 1 ground precompressed schematic cross-sectional view;

Fig. 2 ground precompressed longitudinal section schematic diagram;

The concrete prefabricated plate constructional drawing of Fig. 3;

The concrete prefabricated plate of Fig. 4 is laid schematic cross-sectional view;

Fig. 5 pre-pressing bracket cross-sectional drawing;

Fig. 6 pre-pressing bracket skiagraph;

Among the figure: 1 concrete prefabricated square 2 original grounds 3 change dregs 4 settlement observation points 5 concrete prefabricated plates 6 gutters, 7 veneers, 8 lumps of wood, 9 i iron, 10 cross bars, 11 shearing bars, 12 vertical rods 13 fill compactions 14 vertical rods of rockfilling

The specific embodiment

Below in conjunction with drawings and Examples the present invention is described in further details, these embodiment only are used for illustrating the present invention, do not limit the scope of the invention.

Embodiment

Remove first ground base table soil and assorted native 60cm, fill out 30cm rock ballast soil, roll with 20 tons of road rollers, smooth.Adopt concrete prefabricated square (size 90cm * 90cm * 90cm) precompressed (heap(ed) capacity is case beam weight 150%), every heavy 1.7 tons, every meter piling prepressing number of packages amount is 12, as shown in Figure 1 and Figure 2.The precompressed observation time is 7d, and ground day settling amount is less than 2.0mm, and continuous three days ground settling amounts are less than 2mm, and unloading is tamped smooth.Lay the concrete prefabricated chunk, concrete prefabricated plate is constructed as shown in Figure 3, and concrete prefabricated plate is laid the cross section as shown in Figure 4, and concrete slab intensity is 25MPa, to notice during laying that plate contacts fully with stabilized zone, can carry out next procedure after the plate seam is filled and led up with mortar and set up support.After support is set up complete and is completed bed die, with concrete prefabricated square precompressed support 3d, such as Fig. 5, shown in Figure 6, support day continuous two days of the rate of settling less than 2mm/d, unloading.

Claims

1. the modular construction method in deep soft foundation highway section Cast-in-Situ Continuous Beam is characterized in that the method comprises the steps:

2. the modular construction method of deep soft foundation according to claim 1 highway section Cast-in-Situ Continuous Beam, it is characterized in that: concrete prefabricated square can be recycled, first precompressed ground, again precompressed support.

3. the modular construction method of deep soft foundation according to claim 1 highway section Cast-in-Situ Continuous Beam, it is characterized in that: concrete prefabricated plate can be recycled, and can lay fast assembly unit and form the ground hardened layer that binds.