CN102704491B - Sectional steel and reinforced concrete beam combination foundation pit supporting protection surrounding purlin and construction method of purlin - Google Patents

Sectional steel and reinforced concrete beam combination foundation pit supporting protection surrounding purlin and construction method of purlin Download PDF

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Publication number
CN102704491B
CN102704491B CN 201210191169 CN201210191169A CN102704491B CN 102704491 B CN102704491 B CN 102704491B CN 201210191169 CN201210191169 CN 201210191169 CN 201210191169 A CN201210191169 A CN 201210191169A CN 102704491 B CN102704491 B CN 102704491B
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China
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shaped steel
reinforced concrete
purlin
bolt
foundation ditch
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CN 201210191169
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Chinese (zh)
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CN102704491A (en
Inventor
刘全林
宋伟民
王冰冰
刘斐然
金换昊
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上海强劲地基工程股份有限公司
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Priority to CN 201210191169 priority Critical patent/CN102704491B/en
Publication of CN102704491A publication Critical patent/CN102704491A/en
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Publication of CN102704491B publication Critical patent/CN102704491B/en

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Abstract

The invention relates to a sectional steel and reinforced concrete beam combination foundation pit supporting protection surrounding purlin and a construction method of the purlin. Sectional steel and reinforced concrete beams are horizontally overlapped and placed and are connected through embedded connecting screw bolts for forming the novel combination surrounding purlin. The stress surface of the surrounding purlini is increased so that the stress of the concrete beam is dispersed, cracks and damage of the concrete beam are eliminated, the bending resistance intensity of the surrounding purlin and the axial pressure resistance capability of the sectional steel are improved, the deformation of the foundation pit structure is reduced, and the foundation pit engineering safety is improved. The connection and disconnection with an opposite supporter or a corner supporter can also be convenient, the sectional steel recovery is realized, the cyclic utilization is realized, and the goals of low carbon and environment protection of the foundation pit supporting protection are reached.

Description

A kind of shaped steel and reinforced concrete beam combined foundation ditch support enclose purlin and job practices thereof

Technical field

The present invention relates to technical field of civil engineering, the particularly inner supporting structure of pattern foundation pit supporting structure and job practices, and the recycling of enclosing the purlin material.

Background technology

In foundation pit supporting construction, inner support supporting and protection structure is commonly used encloses purlin, mainly contains reinforced concrete fortifield village's purlin and shaped steel and encloses purlin.Reinforced concrete fortifield village purlin can be combined into an integral body effectively with the campshed body of wall of vertically going along with sb. to guard him in pattern foundation pit supporting structure, bearing horizontal Water And Earth Pressures, but the construction period is longer, and material is reusable not; Shaped steel encloses purlin and has easy construction, does not need maintenance, and the construction period is short, but gives synthetic whole structure undesirable to vertical fender post.Can say, these two kinds enclose purlin all separately pluses and minuses are arranged.When the spacing of inner support is larger, need increase arrangement of reinforcement in the inboard of reinforced concrete fortifield village purlin, could satisfy its flexural strength requirement.The spacing of its inner support is larger, and the quantity of reinforcement of reinforced concrete fortifield village purlin is just higher, thereby will greatly increase material cost.The spacing that increases inner support is the developing direction of foundation pit supporting project, because can not only reduce like this quantity of inner support, and can increase the construction space of foundation ditch inside, improves the speed of application of foundation ditch.In order to improve the bending resistance of enclosing purlin, H shaped steel and reinforced concrete beam are combined into enclose purlin, so both can reduce the consumption of reinforcing bar, can with the recycling of H shaped steel, realize the target of energy-saving and emission-reduction again.

Summary of the invention

Technical problem to be solved by this invention is, the braced structures that overcomes existing pattern foundation pit supporting structure enclose the purlin flexural strength low, with support or angle brace are connected the shortcomings such as inconvenience, provides a kind of shaped steel and reinforced concrete beam to make up and enclose purlin, and the job practices of purlin is enclosed in this combination.Shaped steel and reinforced concrete beam are combined into enclose purlin, both can be connected to support or angle brace with shaped steel easily, can be connected to support or angle brace with steel concrete easily again.

In order to address the above problem, technical scheme of the present invention is such:

a kind of shaped steel and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, shaped steel and reinforced concrete beam level are stacked together, reinforced concrete beam is connected with vertical fender post, be provided with pre-buried connecting bolt in reinforced concrete beam, on two side wing edges of shaped steel, a plurality of bolts hole at a certain distance distribute, the bolt hole of shaped steel one side is used for connecting pre-buried connecting bolt, the bolt hole of opposite side is used for connecting the inner support of pattern foundation pit supporting structure, the bolt hole that pre-buried connecting bolt passes on shaped steel one side wing edge passes through detachable fastening nuts, removing nut can reclaim shaped steel.

Described shaped steel is H shaped steel.

H shaped steel is multilayer.H shaped steel H vertically stacks.

H shaped steel and concrete beam contact surface are provided with separation layer.Separation layer is asphaltic felt or paper or braid etc.

H shaped steel cross section is square.

Pre-embedded bolt is high-strength friction bolt.

The bolt hole that pre-buried connecting bolt passes on H shaped steel one side wing edge passes through detachable fastening nuts.

Pre-buried connecting bolt in reinforced concrete beam is yi word pattern, L-type or U-shaped.

Pre-buried connecting bolt in reinforced concrete beam is connected with the muscle in reinforced concrete beam.

Be provided with the triangle bracket in the bottom of enclosing purlin, bracket evenly distributes along enclosing the inboard horizontal direction of purlin.

H shaped steel is that frame is placed on the triangle bracket.

Fender post is vertical bored pile or the stake of SMW engineering method, and it is whole that shaped steel and reinforced concrete beam and vertical bored pile or the stake of SMW engineering method are combined into a supporting.

The job practices that a kind of shaped steel and reinforced concrete beam combined foundation ditch support enclose purlin is characterized in that,

1) at the reinforcing bar that encloses assembling reinforcement concrete beam on the position of purlin, and place simultaneously pre-buried connecting bolt;

2) pre-buried connecting bolt one end is connected with H shaped steel, the other end is connected with reinforcing bar in reinforced concrete beam;

3) outside shuttering of reinforced concrete beam, the inboard of reinforced concrete beam utilizes H shaped steel to make template, and concreting, and maintenance certain hour after reaching desired strength, with the pre-buried connecting bolt of nut screwing clamping, make shaped steel connect together with reinforced concrete beam.

Step 2) in, enclosing on the position of purlin, the triangle bracket is installed, shaped steel frame is placed on bracket;

3) in step, increase separation layer.

Before the step 1) construction, first strip out the muscle in fender post, the reinforcing bar of reinforced concrete beam is connected with the muscle of fender post, and connected mode is welding or colligation connection.

Step 2) before the construction, along enclosing the purlin position, the soil layer of first excavating in foundation ditch forms a ditch mortise, in order to the triangle bracket is installed.

In step 3), pre-buried connecting bolt is connected with reinforcing bar in reinforced concrete beam, and connected mode connects for welding or colligation.

In step 3), before concreting, with clay, the bolt hole on H shaped steel is sealed.

After engineering finished, the attaching nut who turns on H shaped steel and reinforced concrete beam utilized jacking device that H shaped steel and reinforced concrete beam are thrown off, and H shaped steel is hung out recycling.

The jacking device level is arranged in H shaped steel, and jacking device one end withstands on pre-buried bolt, and the other end withstands on the edge of a wing of H shaped steel, starts jacking device, and pre-buried bolt conduct is activity supporting point not, and jacking device backs down H shaped steel at leisure from reinforced concrete beam.

Beneficial effect, this enclose purlin have flexural strength large, with to support or the advantages such as angle brace is easy to connect, reusing, reached the reduction of erection time, reduced the purpose of construction costs.

Description of drawings

Describe the present invention in detail below in conjunction with the drawings and specific embodiments;

Fig. 1 is that a kind of H shaped steel and the reinforced concrete combination that of the present invention and vertical bored pile enclosure wall is combined encloses purlin.

Fig. 2 is that a kind of H shaped steel and the reinforced concrete combination that of the present invention and vertical SMW engineering method stake enclosure wall is combined encloses purlin.

The specific embodiment

For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.

Referring to Fig. 1 or Fig. 2, this kind H shaped steel and reinforced concrete combination enclose purlin, comprise a H shaped steel 1, and reinforced concrete beam 2, and pre-buried connecting bolt 4 have bolt hole 3 on shaped steel.H shaped steel 1 and reinforced concrete beam 2 levels are stacked together, and are provided with pre-buried connecting bolt 4 in reinforced concrete beam 2, and H shaped steel 1 links together by pre-buried connecting bolt and reinforced concrete beam.Pre-buried connecting bolt 4 is in-line, L shaped or U-shaped, with increase and concrete bonding plane, and conveniently is connected with the main muscle of reinforced concrete beam.This combination is enclosed purlin and is not only had higher flexural strength and horizontal anti-pressure ability, and can conveniently with to support or angle brace be connected or remove, and H shaped steel can conveniently reclaim and reuse, and reaches the purpose of the low-carbon environment-friendly of pattern foundation pit supporting structure.

On two side wing edges of H shaped steel 1, the bolt hole of a plurality of bolt hole 3, one sides that distribute at a certain distance is used for connecting pre-buried connecting bolt 4, and the bolt hole of opposite side is for connecting angle brace or to support.Bolt hole 3 on shaped steel is pre-manufactured hole or boring.

The bolt hole that pre-buried connecting bolt 4 passes on H shaped steel one side wing edge passes through detachable fastening nuts.Tighten the nut on connecting bolt between H shaped steel 1 and reinforced concrete beam 2, can increase the frictional force between H shaped steel and reinforced concrete beam, thereby improved the axial bearing capacity of H shaped steel.

Pre-buried connecting bolt in reinforced concrete beam 2 is yi word pattern, L-type or U-shaped, when being L-type or when U-shaped, owing to can to increase pre-embedded bolt and concrete adhesion stress, making pre-buried connecting bolt 4 be difficult for deviating from turning.

Pre-buried connecting bolt 4 in reinforced concrete beam 2 is connected with the muscle in reinforced concrete beam 2.Be connected with muscle, can increase the uplift resistance of pre-embedded bolt 4, and then make shaped steel have bearing capacity preferably.

Be provided with triangle bracket 6 in the bottom of enclosing purlin, bracket 6 evenly distributes along enclosing the inboard horizontal direction of purlin.H shaped steel 1 is that frame is placed on triangle bracket 6, in order to location and levelling are installed.Triangle bracket 6 is a right angle triangle.One right-angle side carrying H shaped steel 1 of right-angled triangle, another right-angle side of right-angled triangle is the vertical edges of SMW engineering method stake 7, the hypotenuse of right-angled triangle is a support bar.

This combination is enclosed the situation of purlin when vertical bored pile 5 enclosure walls are combined referring to Fig. 1; This combination is enclosed situation that purlin is combined with vertical SMW engineering method stake 7 enclosure walls referring to Fig. 2.

This enclose purlin have flexural strength large, with to support or the advantages such as angle brace is easy to connect, reusing, reached the reduction of erection time, reduced the purpose of construction costs.

Concrete job practices is as follows:

Cut concrete or the cement-soil of periphery, reserve the space of enclosing purlin; The reinforcing bar of vertical bored pile 5 or the H shaped steel of vertical SMW engineering method stake 7 are stripped out, at the reinforcing bar 8 that encloses assembling reinforcement concrete structure on the position of purlin and pre-buried connecting bolt 4.Reinforcing bar 8 and the reinforcing bar of vertical bored pile 5 or the colligation of H shaped steel or the welding of vertical SMW engineering method stake 7.

Along enclosing the purlin position, the soil layer of excavating in foundation ditch forms a ditch mortise, in order to triangle bracket 6 is installed, triangular form bracket 6 is installed, and the battered leg of bracket 6 is supported on vertically goes along with sb. to guard him on piling wall, 1 of H shaped steel is placed on bracket 6, so that location and fixing;

Pre-buried connecting bolt 4 one ends are connected with the bolt hole 3 of H shaped steel 1, and the other end is connected with reinforcing bar 8 in reinforced concrete fortifield village purlin, and connected mode is colligation or welding;

At the outside shuttering of reinforced concrete fortifield village purlin, the inboard utilizes H shaped steel 1 to make template, and bolt hole 3 use clay are sealed; Concreting, and maintenance is to certain length of time, when reaching designing requirement intensity, with the moment of torsion of the nut screwing clamping on connecting bolt 4 to designing requirement.

By above-mentioned steps and job practices, can form a kind of H shaped steel and reinforced concrete combination and enclose purlin, this encloses purlin can not only bear larger moment of flexure, also can bear higher horizontal axis pressure.

After foundation pit supporting project is completed, can follow these steps to complete and remove and recycling.

Turn on the attaching nut on H shaped steel 1 and steel concrete; Level is installed the jacking device of a special use on H shaped steel, and an end withstands on pre-buried bolt 4, and the other end withstands on the edge of a wing of H shaped steel.

Start jacking device, pre-buried bolt 4 conducts are activity supporting point not, and jacking device backs down H shaped steel 1 at leisure from reinforced concrete beam; , H shaped steel 1 can be hung out during fully with 1 disengagement of H shaped steel when pre-embedded bolt 4, can realize the recycling of H shaped steel 1.

The combination of shaped steel and reinforced concrete beam encloses in purlin and traditional foundation pit supporting construction that steel work encloses purlin or reinforced concrete fortifield village purlin is compared, and has the following advantages:

1. shaped steel closely links together by pre-embedded bolt and reinforced concrete beam, and stress surface increases, and the concrete beam force dispersion is eliminated crack and the damage of concrete beam, reduces the steel concrete consumption.Shaped steel detachably reclaims, and recycles, and energy-conserving and environment-protective reduce material cost.

2. shaped steel closely is connected by stone bolt with reinforced concrete beam, and harmonious ground co-operation can stop the cripling of shaped steel, and can significantly improve the out-of-plane torsional buckling performance of shaped steel, and the steel strength of shaped steel is given full play to.

3. support by being connected with shaped steel, shaped steel effectively dispersed steel supports the local compressive stress of termination, crushes and the excessive deformation of the support that causes in the concrete part of having avoided that traditional support part pressure-bearing causes not.

4. in foundation pit supporting construction, the axle power, moment of flexure, the shearing that enclose purlin are often all very large, harmonious ground co-operation by shaped steel and concrete beam, can make the pressurized that encloses the purlin member, be cut, be subjected to curved bearing capacity to increase substantially, steel have namely been saved, reduce again the section area of member, also reduced simultaneously the distortion of foundation pit supporting construction, improved the base pit engineering degree of safety.

5. simultaneously, H shaped steel when placing of concrete, can double as template action in the side of concrete beam, reduces the consumption of template.

Above demonstration and described basic principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not subjected to the restriction of above-mentioned example; that describes in above-mentioned example and manual just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims (21)

1. a shaped steel and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, shaped steel and reinforced concrete beam level are stacked together, reinforced concrete beam is connected with vertical fender post, be provided with pre-buried connecting bolt in reinforced concrete beam, on two side wing edges of shaped steel, a plurality of bolts hole at a certain distance distribute, the bolt hole of shaped steel one side is used for connecting pre-buried connecting bolt, the bolt hole of opposite side is used for connecting the inner support of pattern foundation pit supporting structure, the bolt hole that pre-buried connecting bolt passes on shaped steel one side wing edge passes through detachable fastening nuts, removing nut can reclaim shaped steel.
2. a kind of shaped steel according to claim 1 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, shaped steel is H shaped steel.
3. a kind of shaped steel according to claim 2 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that H shaped steel is multilayer.
4. a kind of shaped steel according to claim 2 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that H shaped steel and concrete beam contact surface are provided with separation layer.
5. a kind of shaped steel according to claim 2 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, H shaped steel cross section is square.
6. a kind of shaped steel according to claim 2 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, pre-embedded bolt is high-strength friction bolt.
7. a kind of shaped steel according to claim 2 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that the bolt hole that pre-buried connecting bolt passes on H shaped steel one side wing edge passes through detachable fastening nuts.
8. a kind of shaped steel according to claim 2 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, the pre-buried connecting bolt in reinforced concrete beam is yi word pattern, L-type or U-shaped.
9. a kind of shaped steel according to claim 2 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, the pre-buried connecting bolt in reinforced concrete beam is connected with the muscle in reinforced concrete beam.
10. a kind of shaped steel according to claim 2 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, are provided with the triangle bracket in the bottom of enclosing purlin, and bracket evenly distributes along enclosing the inboard horizontal direction of purlin.
11. a kind of shaped steel according to claim 7 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, H shaped steel is that frame is placed on the triangle bracket.
12. a kind of shaped steel according to claim 1 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, fender post is vertical bored pile or the stake of SMW engineering method, and it is whole that shaped steel and reinforced concrete beam and vertical bored pile or the stake of SMW engineering method are combined into a supporting.
13. the job practices that a kind of shaped steel as claimed in claim 1 and reinforced concrete beam combined foundation ditch support enclose purlin is characterized in that,
1) at the reinforcing bar that encloses assembling reinforcement concrete beam on the position of purlin, and place simultaneously pre-buried connecting bolt;
2) pre-buried connecting bolt one end is connected with H shaped steel, the other end is connected with reinforcing bar in reinforced concrete beam;
3) outside shuttering of reinforced concrete beam, the inboard of reinforced concrete beam utilizes H shaped steel to make template, and concreting, and maintenance certain hour after reaching desired strength, with the pre-buried connecting bolt of nut screwing clamping, make shaped steel connect together with reinforced concrete beam.
14. the job practices that a kind of shaped steel according to claim 13 and reinforced concrete beam combined foundation ditch support enclose purlin is characterized in that step 2) in, enclosing on the position of purlin, the triangle bracket is installed, shaped steel frame is placed on bracket;
15. the job practices that a kind of shaped steel according to claim 13 and reinforced concrete beam combined foundation ditch support enclose purlin is characterized in that 3) in step, increase separation layer.
16. the job practices that a kind of shaped steel according to claim 13 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, before the step 1) construction, first strip out the muscle in fender post, the reinforcing bar of reinforced concrete beam is connected with the muscle of fender post, and connected mode is welding or colligation connection.
17. the job practices that a kind of shaped steel according to claim 14 and reinforced concrete beam combined foundation ditch support enclose purlin is characterized in that step 2) before construction, along enclosing the purlin position, the soil layer of first excavating in foundation ditch forms a ditch mortise, in order to the triangle bracket is installed.
18. the job practices that a kind of shaped steel according to claim 13 and reinforced concrete beam combined foundation ditch support enclose purlin is characterized in that, in step 3), pre-buried connecting bolt is connected with reinforcing bar in reinforced concrete beam, and connected mode connects for welding or colligation.
19. the job practices that a kind of shaped steel according to claim 13 and reinforced concrete beam combined foundation ditch support enclose purlin is characterized in that, in step 3), before concreting, with clay, the bolt hole on H shaped steel is sealed.
20. the job practices that a kind of shaped steel according to claim 13 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, after engineering finishes, turn on the attaching nut of H shaped steel and reinforced concrete beam, utilize jacking device that H shaped steel and reinforced concrete beam are thrown off, H shaped steel is hung out recycling.
21. the job practices that a kind of shaped steel according to claim 20 and reinforced concrete beam combined foundation ditch support enclose purlin, it is characterized in that, the jacking device level is arranged in H shaped steel, jacking device one end withstands on pre-buried bolt, the other end withstands on the edge of a wing of H shaped steel, start jacking device, pre-buried bolt conduct is activity supporting point not, and jacking device backs down H shaped steel at leisure from reinforced concrete beam.
CN 201210191169 2012-06-11 2012-06-11 Sectional steel and reinforced concrete beam combination foundation pit supporting protection surrounding purlin and construction method of purlin CN102704491B (en)

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Application Number Priority Date Filing Date Title
CN 201210191169 CN102704491B (en) 2012-06-11 2012-06-11 Sectional steel and reinforced concrete beam combination foundation pit supporting protection surrounding purlin and construction method of purlin

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 201210191169 CN102704491B (en) 2012-06-11 2012-06-11 Sectional steel and reinforced concrete beam combination foundation pit supporting protection surrounding purlin and construction method of purlin
HK13102565.6A HK1175507A1 (en) 2012-06-11 2013-02-28 Foundation pit support purlin formed by the combination of structural steels and reinforced concrete beams and construction method thereof

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CN102943481A (en) * 2012-12-12 2013-02-27 上海强劲地基工程股份有限公司 Reinforced concrete beam and steel beam combined connecting structure for foundation pit supporting and construction method thereof
CN103161169B (en) * 2013-03-13 2015-06-17 上海强劲地基工程股份有限公司 Prestressed girder for foundation pit supporting
CN103216085B (en) * 2013-05-14 2018-04-27 华东建筑设计研究院有限公司 A kind of removable lining self-bearing type reinforcement bar truss mould plate
CN103290851B (en) * 2013-06-28 2015-05-20 上海强劲地基工程股份有限公司 Prestressed steel support used for controlling internal and external differential displacement of foundation pit enclosure wall and construction method
CN103397643A (en) * 2013-07-26 2013-11-20 浙江博雷重型机床制造有限公司 Connector for internal supporting system for integral prestress fabricated foundation pit support
CN103882868B (en) * 2014-03-11 2017-09-12 中国建筑第八工程局有限公司 Bored concrete pile encloses the unilateral formwork supporting structure and construction method of purlin in going along with sb. to guard him
CN107386299A (en) * 2017-08-21 2017-11-24 中国二十冶集团有限公司 Foundation ditch supports concrete construction method
CN109706939B (en) * 2019-01-14 2020-09-15 杭州江润科技有限公司 Deep foundation pit prestress combined steel support and construction method
CN110485429A (en) * 2019-03-21 2019-11-22 安徽省第一建筑工程有限公司 A kind of prestressing force fashioned iron assembled combination inner support construction method

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