CN106088148B - Pipe gallery template and its application - Google Patents

Pipe gallery template and its application Download PDF

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Publication number
CN106088148B
CN106088148B CN201610633750.1A CN201610633750A CN106088148B CN 106088148 B CN106088148 B CN 106088148B CN 201610633750 A CN201610633750 A CN 201610633750A CN 106088148 B CN106088148 B CN 106088148B
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CN
China
Prior art keywords
template
plate
steel
prop
pipe gallery
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CN201610633750.1A
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Chinese (zh)
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CN106088148A (en
Inventor
常杰
谭福生
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中国华冶科工集团有限公司
华北冶建工程建设有限公司
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Priority to CN201610633750.1A priority Critical patent/CN106088148B/en
Publication of CN106088148A publication Critical patent/CN106088148A/en
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Publication of CN106088148B publication Critical patent/CN106088148B/en

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/10Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells

Abstract

The present invention provides a kind of pipe gallery template and its application, wherein, template is aluminum alloy mould plate, and template includes side wall template, roof plate template and the splay angle template being arranged between side wall template and roof plate template;Side wall template is by the way that steel back is stupefied and diagonal brace fixes support;Also include support post, often cover roof plate template and be correspondingly arranged three groups of support posts;Support post includes lower prop, the upper prop being set in lower prop, and the regulating bolt card being arranged between upper prop and lower prop;There is column bracket in upper prop end set, column bracket is fixedly connected with the concealed beam of roof plate template by pin.Using foregoing invention, concrete appearance is attractive in appearance, neat, and cleaning amount is small;Meanwhile the quality that pours concrete is good, expense is low, speed is fast.

Description

Pipe gallery template and its application
Technical field
The present invention relates to technical field of civil engineering, more specifically, is related to a kind of pipe gallery template and its application.
Background technology
With the fast development of the wide net system of urban networkization municipal administration, road is anti-caused by pipeline dilatation, renewal, maintenance etc. The phenomenon excavated again is very common, and the not only normal life to resident puts to no little inconvenience, while also brings environmental pollution, makes an uproar The otherwise harmful effect such as sound pollution and cross pipe-line infringement, urban traffic blocking, commercial interest loss, has become The bottleneck of urban infrastructure development and enhancement of environment is restricted, therefore, pipe gallery is built as effective city basis instrument that solves If the new model of contradiction, progressively gets the nod and promotes.
Urban Underground pipeline synthesis be also known as " common trench ", " Common Ducts ", be by electric power, communication, combustion gas, heat supply, to The two or more municipal pipelines such as draining are concentrated and are laid in the tunnel, and provided with special access hole, hoisting port and detecting system, Implement unified planning, design, the intensive tunnel space constructed and be maintained in.With comprehensive, long-term effect, maintainability, The features such as high-tech, Seismic Resistance And Disaster Reduction, the feature of environmental protection, low cost, investment diversity and operation reliability.
The construction of pipe gallery typically combines the form of local tunneling, in its process of construction, the branch of template using open cut It is how faster and better if being the material particular concerning piping lane quality, speed of application and construction cost etc., while cost is minimum is Select template form and the key of support system.
At present, for pipe gallery template nothing more than two kinds of wooden model and large steel moulding plate, there is the drawbacks of certain in two methods;Its In, wooden model reinforcement system is cumbersome, and the number of turnover is few, and yielding, and especially later stage plank sheathing comes unglued deformation, not only influences to pour The quality of rear concrete is built, can also cause wood fragments completely, safety construction is poor.And the external mold of large steel moulding plate needs large-scale crane Coordinate lifting, internal model is not easy to be displaced outwardly because space limits after pouring.In addition, wooden model and large steel moulding plate, which all exist, is difficult to early tear open The weakness of mould, it is necessary to do 3~4 sets of templates, pipe gallery construction quality and efficiency are affected.
The content of the invention
In view of the above problems, it is comprehensive at present to solve it is an object of the invention to provide a kind of pipe gallery template and its application Close the installation of piping lane built-in fitting template and dismantle complexity, be not easy to realize early form removal, need making to cover templates more, influence pipe gallery The problems such as construction quality and efficiency.
According to an aspect of the present invention, there is provided a kind of pipe gallery template, template are aluminum alloy mould plate, and template includes side Wall form, roof plate template and the splay angle template being arranged between side wall template and roof plate template;Side wall template passes through steel back Stupefied and diagonal brace fixes support;Also include support post, often cover roof plate template and be correspondingly arranged three groups of support posts;Wherein, support is vertical Post includes lower prop, the upper prop being set in lower prop, and the regulating bolt card being arranged between upper prop and lower prop;In upper column end Column bracket is provided with, column bracket is fixedly connected with the concealed beam of roof plate template by pin.
Furthermore it is preferred that scheme be to be welded with fixation steel plate in one end of diagonal brace, reserved open is provided with fixation steel plate Hole;Jack is provided with bottom plate, after reinforced steel passes through reserved perforate, is inserted in the jack on bottom plate;The other end of diagonal brace With the stupefied fixation of steel back.
Furthermore it is preferred that scheme be that template also includes basic external mold and corresponding internal model, basic external mold and internal model coordinate Pour to form bottom plate and lead wall more than bottom plate.
Furthermore it is preferred that scheme be that basic external mold is stock mould, internal model is wooden model.
Furthermore it is preferred that scheme be to be reserved with wall is led to wire drawing hole, wood is being respectively fixed with to wire drawing hole both sides Side, side wall template are extended downward on flitch.
Furthermore it is preferred that scheme be that the end face for leading wall forms first time concrete face, be embedded with water-stopping steel on first time concrete face Plate.
Furthermore it is preferred that scheme be that the cross section of aluminum alloy mould plate is U groove structure, in the U-lag of aluminum alloy mould plate It is welded with equally distributed rib side;Connected between aluminum alloy mould plate by pin, bolt, U-shaped card, L-shaped latch or fastener.
According to another aspect of the present invention, there is provided a kind of pipe gallery template application method, including:Pass through one-time-concreting shape Wall is led more than into bottom plate and bottom plate;Install successively and reinforce side wall template, roof plate template and positioned at side wall template and top plate mould Splay angle template between plate;Wherein, before roof plate template is installed, support post is installed;The casting concrete into template, and When reaching form removal condition, form removal simultaneously retains support post;Wherein, three groups of support posts recycle with a set of template.
Furthermore it is preferred that scheme be that for side wall template by the way that steel back is stupefied and diagonal brace coordinates and fixed, one end of diagonal brace is fixed on steel On back cord, the other end of diagonal brace is spacing on bottom plate by reinforced steel.
Furthermore it is preferred that scheme be to be welded with fixation steel plate in the end of diagonal brace, reserved open is provided with fixation steel plate Hole;In fixed diagonal brace, jack is provided with bottom plate, after reinforced steel passes through reserved perforate, is inserted in the jack on bottom plate.
Utilize the above-mentioned pipe gallery template according to the present invention and its application, using quick-dismantling system formwork, in light weight, rigidity Greatly, support system is simple, meanwhile, template turnover is accelerated using the post support system of a mould three, ensures fast branch Quick Release, quickening construct into Degree, save engineering cost.
In order to realize above-mentioned and related purpose, one or more aspects of the invention include will be explained in below and The feature particularly pointed out in claim.Some illustrative aspects of the present invention are described in detail in following explanation and accompanying drawing. However, some modes in the various modes of the principle that the present invention only can be used of these aspect instructions.It is in addition, of the invention It is intended to include all these aspects and their equivalent.
Brief description of the drawings
By reference to the explanation and the content of claims below in conjunction with accompanying drawing, and with to the present invention more comprehensively Understand, other purposes and result of the invention will be more apparent and should be readily appreciated that.In the accompanying drawings:
Fig. 1 is the side wall template partial structural diagram according to the embodiment of the present invention;
Fig. 2 is the support post partial structural diagram according to the embodiment of the present invention;
Fig. 3 is the splay angle template profile according to the embodiment of the present invention;
Fig. 4 is the pipe gallery model sheetinstallat process for using figure according to the embodiment of the present invention.
Reference therein includes:Bottom plate 1, first time concrete face 11, steel plate for sealing water 12, lower prop 21, upper prop 22, regulation spiral shell Bolt card 23, column bracket 24, roof plate template 3, side wall template 4, split bolt 5, steel back are stupefied 6, diagonal brace 7, reinforced steel 8, flitch 9.
Identical label indicates similar or corresponding feature or function in all of the figs.
Embodiment
In the following description, for purposes of illustration, in order to provide the comprehensive understanding to one or more embodiments, explain Many details are stated.It may be evident, however, that these embodiments can also be realized in the case of these no details. In other examples, for the ease of describing one or more embodiments, known structure and equipment are shown in block form an.
It is current to solve:Plank sheathing need to easily reconfigure after having enough to meet the need four to five times because of template cracking, deformation, and wood Mould is that whole system is reinforced, and to do three to four set template turnovers, costly, speed of application is slow.After form removal, wooden model is easily clipped in coagulation In soil, perception is poor, and wood chip is produced in construction, and flitch, clamping plate around are got rid of after form removal, and civilized construction effect is poor, are especially being had The construction part at armpit angle, it is difficult to reinforce in place, therefore wooden model is not easy to apply in piping lane.And big punching block is difficult to move, small steel mold Have and be difficult to reinforce, reuse low problem, the pipe gallery template of the embodiment of the present invention, using the aluminium alloy mould of Fast-dismantle system Plate, and match somebody with somebody the support system of the unification post of mould three, ensure the fast branch Quick Release of template, accelerate speed of application, at the same it is cost-effective.
For the pipe gallery template of the embodiment of the present invention and its application is described in detail, below with reference to accompanying drawing to the present invention's Specific embodiment is described in detail
In the pipe gallery template of the embodiment of the present invention, template uses aluminum alloy mould plate, and template includes side wall template, top Template die plate and the splay angle template being arranged between side wall template and roof plate template;During the installing of template, side wall mould Plate is by the way that steel back is stupefied and diagonal brace fixes support;In addition, also including the support post of roof supporting template, it is corresponding often to cover roof plate template Three groups of support posts are set;Wherein, support post further comprises lower prop, the upper prop being set in lower prop, and is arranged on Regulating bolt card between post and lower prop, by position of the regulating bolt card control upper prop in lower prop, so as to support post Height be adjusted;In addition, having a column bracket in upper prop end set, the concealed beam of column bracket and roof plate template, which passes through pin, fixes and connects Connect.
It should be noted that the pipe gallery of the embodiment of the present invention could be arranged to more chamber structures, such as combustion gas storehouse, hydro-thermal Three chamber structures that storehouse and electrical telecommunication storehouse are formed.Installing point two layers for corresponding pipe gallery template, more than bottom plate and bottom plate leads wall One-time-concreting is formed, and remaining wall (or side wall) and top plate one-time-concreting are formed.Wherein, to ensure the standard of side wall casting position True property, pours the concrete wall of certain altitude, that is, leads wall in advance on bottom plate;Lead wall height be generally located on 150mm~ Between 500mm.In the specific embodiment of the present invention, the height for leading wall is 500mm.
Because the bottom of pipe gallery is provided with armpit angle, template consumption is seldom in addition, in the specific implementation of the present invention In mode, template also includes basic external mold and corresponding internal model, and basic external mold and internal model, which coordinate, to be poured to form bottom plate and be located at More than bottom plate lead wall.To protect waterproof layer, basic external mold can use stock mould, and corresponding internal model can use wooden model, and wall Wall and top plate use aluminum alloy mould plate, bottom plate and lead the construction and protection that can facilitate waterproof layer outside wall using stock mould.
As specific embodiment, the cross section of aluminum alloy mould plate is U groove structure, is welded in the U-lag of aluminum alloy mould plate Equally distributed rib side is connected to, is combined between each aluminum alloy mould plate by pin, bolt, U-shaped card, L-shaped latch or fastener etc. Connection.For example, aluminum alloy mould plate specification can be wide 4000mm, 3.75~4mm of thickness, aluminium alloy blank material is pressed into U groove structure, Rib side is welded behind the inside of U-lag.Height, the length of aluminum alloy mould plate then carry out true according to side wall and the specific size of top plate It is fixed.
Specifically, Fig. 1 shows side wall template partial structurtes according to embodiments of the present invention.
As shown in figure 1, bottom plate 1 and bottom plate more than 1 lead wall reinforce simultaneously casting concrete by accompanying drawing 1, poured in concrete Form removal is carried out to basic external mold and internal model after the completion of building.Wherein, the end face for leading wall forms first time concrete face 11, in first time concrete face Steel plate for sealing water 12 is embedded with 11.Flitch 9 is fixed in the both sides to wire drawing hole reserved when pouring and leading wall respectively, in side wall template In 4 fixation procedure, side wall template 4 is set to place the side of side wall template 4 to close to the side of bottom plate 1 extension 50mm~100mm On flitch 9, it is ensured that the keep level state of side wall template 4, by flitch 9 carry out it is levelling can accelerate speed of application, avoid people For drawbacks such as the levelling template error brought big, easy opening, easy spillages.
In addition, pour lead wall when, be also reserved with many places split bolt hole, side wall template 4 be shelved on corresponding to flitch 9 After upper, corresponding steel back stupefied 6 and the offside wall form 4 of diagonal brace 7 is coordinated to carry out reinforcing support by many places split bolt 5.
In the specific embodiment of the present invention, diagonal brace 7 can use telescopic steel pipe, such as the steel pipes of φ 63;In addition, Can to simplify the fixation between diagonal brace 7 and bottom plate 1 while ensuring that diagonal brace 7 is reliably fixed, saving pre- on bottom plate 1 Embedded part, accelerating construction progress, in the fixation procedure of side wall template 4 of the present invention, steel back stupefied 6 is fixed on the outside of side wall template 4, tiltedly One end of support 7 is fixed in steel back stupefied 6, and the other end of diagonal brace 7 is spacing on bottom plate 1 by reinforced steel 8, wherein, reinforce steel Muscle 8 can select the reinforcing bars of φ 12.
Specifically, the fixation steel plate of rectangular configuration is welded close to the end of the side of bottom plate 1 in diagonal brace 7, on fixation steel plate Reserved perforate is provided with, in fixed diagonal brace 7, the jack on vertical direction, fixation steel plate are opened up on bottom plate 1 using impact drill It is bonded with bottom plate 1, and makes the reserved perforate on fixation steel plate corresponding with the jack position on bottom plate 1, then, utilizes reinforced steel 8, through the reserved perforate on steel plate, insert in the jack of bottom plate 1, diagonal brace 7 are fixed, simple in construction, construction is just It is prompt.
When carrying out formwork reinforcing to roof plate template, roof supporting template is provided between roof plate template and bottom plate 1 Support post, Fig. 2 show support post partial structurtes according to embodiments of the present invention.
As shown in Fig. 2 support post includes the lower prop 21 being supported on bottom plate, the upper prop being set in the upper end of lower prop 21 22, and the regulating bolt card 23 being arranged between upper prop 22 and lower prop 21, upper prop 22 is controlled under by regulating bolt card 23 Position in post 21, so as to which the height of support post be adjusted;In addition, there is column bracket 24 in the end set of upper prop 22, along post Support 24 sets reinforcement concealed beam, and concealed beam is fixedly connected with the roof plate template 3 of surrounding by pin, the concealed beam of column bracket 24 and roof plate template 3 It can also be fixedly connected by pin.
In the specific embodiment of the present invention, a set of roof plate template 3 is correspondingly arranged three support posts, in coagulation Soil conserves one day or so after pouring, you can removes the roof plate template 3 of support post surrounding, only retains support post to dark Beam is supported, when concrete strength reaches design requirement intensity more than 80%, you can support post and its column bracket 24 are entered Row is removed.
Wherein, three support posts are correspondingly arranged in a set of roof plate template 3, i.e. the support system of the post of a mould three used Cheng Zhong:Formwork erection reinforcing is carried out using a set of template and the first support post, and pours the coagulation of wall and top plate for the first time Soil, one day or so the time of concrete curing is treated, remove the set template, and retain the first support post.Then, also using the cover die Plate simultaneously coordinates the second support post to carry out formwork erection reinforcing, and second of casting concrete again, treats concrete curing one day The left and right time, the set template is removed, and retain the second support post.Secondly, using the set template and the 3rd support post of cooperation Formwork erection reinforcing, and third time casting concrete are carried out again, are treated one day or so the time of concrete curing, are removed the cover die Plate, and retain the 3rd support post.When being poured for the 4th time, the set strength of first time casting concrete, which has reached, to be set Intensity requirement is counted, the first support post can be removed, and application recycles into the 4th concreting, it is real The support system of the existing post of a mould three, overcomes the architecture of the existing post of three mould three, cost is low, speed is fast.
It should be noted that the pipe gallery template of the present invention, is not intended to limit the reinforcement system of the post of a mould three, according to construction It is required that and execution conditions, various improvement can also be made on the basis of present invention is not departed from, for example, the post of a mould two, two The post of mould four, the post of two mould five etc..
Fig. 3 shows splay angle template cross-section structure according to embodiments of the present invention.
As shown in figure 3, splay angle template-setup between side wall template and roof plate template, can pass through pin and top plate mould Plate and side wall template are fixedly connected, in accompanying drawing 3, to be indeformable after the convenient disassembly of guarantee splay angle template, reinforcing, by this Splay angle template-setup is band ear structure;For example, the size on anistree each side of template is 100mm, 200mm, 213mm, it is known that, this is small Shape, the size of type aluminum dipping form can be adjusted according to roof plate template and side wall template and construction requirement.
Corresponding with the device of above-mentioned pipe gallery template, the present invention also provides a kind of pipe gallery template application method. Specifically, Fig. 4 shows pipe gallery template process for using according to embodiments of the present invention.
As shown in figure 4, the pipe gallery model sheetinstallat application method of the embodiment of the present invention includes:
S410:Formed more than bottom plate and bottom plate by one-time-concreting and lead wall.
Wherein, more than bottom plate and bottom plate lead wall by accompanying drawing 1 reinforce and casting concrete, after the completion of concreting Form removal is carried out to basic external mold and internal model.Wherein, the end face for leading wall forms first time concrete face, is embedded with only on first time concrete face Water steel plate.
S420:Install successively and reinforce side wall template, roof plate template and between side wall template and roof plate template Splay angle template;Wherein, before roof plate template is installed, support post is installed.
Wherein, flitch is fixed in the both sides to wire drawing hole reserved when pouring and leading wall respectively, in fixing for side wall template Cheng Zhong, side wall template is set to be extended to close to bottom plate side on flitch, it is ensured that side wall template keep level state.
Meanwhile side wall template is by the way that steel back is stupefied and diagonal brace coordinates and fixed, one end of diagonal brace be fixed on steel back it is stupefied on, diagonal brace The other end is spacing on bottom plate by reinforced steel.Steel plate is welded and fixed in the end of diagonal brace, is set on fixation steel plate reserved Perforate;In fixed diagonal brace, after setting jack, reinforced steel to pass through reserved perforate on bottom plate, insert in the jack of bottom plate.
S430:The casting concrete into template, and when reaching form removal condition, form removal simultaneously retains support post;Its In, three groups of support posts recycle with a set of template.
Wherein, a set of roof plate template is correspondingly arranged three support posts, is conserved one day or so after concreting, you can The roof plate template of support post surrounding is removed, only retains support post and concealed beam is supported, treat that concrete strength reaches During to design requirement intensity more than 80%, you can removed support post and its column bracket.
The specific embodiment of pipe gallery model sheetinstallat application method provided by the invention and pipe gallery plate device Embodiment is similar, and related part can be referred to mutually, no longer be repeated one by one herein.
Pipe gallery template and its application of the present invention is can be seen that by above-mentioned embodiment, there is advantages below:
1st, using aluminum alloy mould plate, light weight, rigidity are big, support system is simple;
2nd, using the support system roof supporting template of the post of a mould three, speed of application is fast, efficiency high, also, outside concrete See attractive in appearance, clean and tidy.
3rd, spacing, structure is carried out to the diagonal brace and bottom plate of supporting side walls template by the cooperation of fixation steel plate and reinforced steel Simply, expense is low, speed is fast.
Pipe gallery template according to the present invention and its application are described in an illustrative manner above with reference to accompanying drawing.But this Art personnel should be appreciated that the pipe gallery template proposed for the invention described above and its application, can also not take off From making various improvement on the basis of present invention.Therefore, protection scope of the present invention should be by appended claims Content determine.

Claims (9)

1. a kind of pipe gallery template, it is characterised in that the template includes side wall template, roof plate template and is arranged on institute State the splay angle template between side wall template and the roof plate template;Wherein,
The side wall template, the roof plate template and the splay angle template are the template of aluminum alloy material;
The side wall template is by the way that steel back is stupefied and diagonal brace fixes support;
Also include support post, often cover the roof plate template and be correspondingly arranged three groups of support posts;Wherein,
The support post includes lower prop, the upper prop being set in the lower prop, and is arranged on the upper prop and the lower prop Between regulating bolt card;
There is column bracket in the upper prop end set, the column bracket is fixedly connected with the concealed beam of the roof plate template by pin;
The template also includes basic external mold and corresponding internal model,
The basic external mold and the internal model, which coordinate, to be poured to form bottom plate and lead wall more than the bottom plate;
The side wall template is by the way that the steel back is stupefied and diagonal brace support is fitted in the side for leading wall.
2. pipe gallery template as claimed in claim 1, it is characterised in that
Fixation steel plate is welded with one end of the diagonal brace, reserved perforate is provided with the fixation steel plate;
Jack is provided with the bottom plate, after reinforced steel passes through the reserved perforate, is inserted in the jack on the bottom plate;
The other end of the diagonal brace and the stupefied fixation of the steel back.
3. pipe gallery template as claimed in claim 1, it is characterised in that
The basic external mold is stock mould, and the internal model is wooden model.
4. pipe gallery template as claimed in claim 1, it is characterised in that
It is reserved with described lead on wall to wire drawing hole, wire drawing hole both sides is respectively fixed with flitch, the side wall template described Extend downward on the flitch.
5. pipe gallery template as claimed in claim 1, it is characterised in that
The end face for leading wall forms first time concrete face, and steel plate for sealing water is embedded with the first time concrete face.
6. pipe gallery template as claimed in claim 1, it is characterised in that
The cross section of the aluminum alloy mould plate is U groove structure, is welded with and is uniformly distributed in the U-lag of the aluminum alloy mould plate Rib side;
Connected between the aluminum alloy mould plate by pin, bolt, U-shaped card, L-shaped latch or fastener.
7. a kind of pipe gallery template application method, including:
More than bottom plate and bottom plate are formed by one-time-concreting in the cavity that basic external mold and corresponding internal model are formed and lead wall;
Install successively and reinforce side wall template, roof plate template and between the side wall template and the roof plate template eight Word Angle formwork;Wherein, before the roof plate template is installed, support post is installed, the side wall template is jointly mounted to described Lead the side of wall;The side wall template, the roof plate template and the splay angle template are the template of aluminum alloy material;
The casting concrete into template, and when reaching form removal condition, form removal simultaneously retains the support post;Wherein, three Group support post recycles with a set of template.
8. pipe gallery template application method as claimed in claim 7, it is characterised in that
The side wall template by the way that steel back is stupefied and diagonal brace coordinates and fixed, one end of the diagonal brace be fixed on the steel back it is stupefied on, institute The other end for stating diagonal brace is spacing on the bottom plate by reinforced steel.
9. pipe gallery template application method as claimed in claim 8, it is characterised in that
Fixation steel plate is welded with the end of the diagonal brace, reserved perforate is provided with the fixation steel plate;
In the fixation diagonal brace, jack is provided with the bottom plate, after the reinforced steel passes through the reserved perforate, is inserted Enter in the jack on the bottom plate.
CN201610633750.1A 2016-08-04 2016-08-04 Pipe gallery template and its application CN106088148B (en)

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CN109024676A (en) * 2018-07-27 2018-12-18 广州市第二市政工程有限公司 A kind of formwork bracing system and its construction method of cast-in-place pipe gallery

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