Floor ruggedized construction
Technical field
The present invention relates to a kind of ruggedized construction, in particular to a kind of floor ruggedized construction.
Background technique
Concrete floor is the primary structural member of building, and bearing capacity occurs in use in individual concrete floor
Inadequate phenomenon, in order to guarantee using function, it is clear that concrete floor will be reinforced, but due to thickness of concrete floor
Relatively thin, ruggedized construction also can be relatively thin in order to reduce weight and cost thickness, and the rigidity of structure is smaller, this results in reinforcing preceding knot
It is difficult to form entirety after structure and reinforcing.But it is that engineering staff faces that structure and reinforcing pre-structure carry jointly after reinforcing
Project, and the problem of cost is also intended to thinking how is reduced in the case where ensuring secured premise.
Summary of the invention
The present invention is to provide a kind of floor ruggedized construction, solve after reinforcing structure and reinforce pre-structure be difficult to carry jointly and
Problem at high cost.
The present invention by concrete floor and sprays coagulation in concrete floor following settings gunite concrete, by steel strand wires
Soil unifies, and steel strand wires use bowl-type, and oblique part upper end is fixed on angle steel by anchorage, oblique part lower extreme point position
From 1/4 that concrete floor end position is concrete building span of slab, mainly consider in 1/4 position of concrete building span of slab
Moment of flexure is smaller, and steel strand wires edge using it is oblique be also it is consistent with concrete floor moment of flexure situation, because of concrete building
Edges of boards portion moment of flexure is usually hogging moment.Cushion block is set between horizontal component steel strand wires and concrete floor, and cushion block is concrete square
Block, concrete square block length are 60~90mm, and small steel plate is arranged so as to the steel bar welding with concrete floor above concrete blocks
It connects and unifies.On the one hand the purpose that cushion block is arranged makes steel strand wires avoid loss of prestress when turning to horizontal segment for oblique section,
On the other hand steel strand wires are reduced in the span of horizontal segment to reduce loss of prestress.According to Experimental Comparison, the pre- of bed course is set
Stress loss and the loss of prestress difference for being not provided with bed course are larger, and setting bed course has more significant effect to loss of prestress is reduced
Fruit optimizes comparison according to test result, and cushion block spacing uses 0.5m~0.6m.Between steel strand wires and concrete floor bottom
Gunite concrete is set, and gunite concrete is with a thickness of 60~90mm.Steel strand wires following settings steel plate, steel plate width be 120~
150mm, steel plate thickness are 12~14mm, and steel plate is embedded in concrete column, and embedded length is 100~120mm, and setting is pre- above steel plate
Stress strut, pre-stressed struts diameter are 18~22mm, and pre-stressed struts horizontal space is 0.6m~0.7m, and pre-stressed struts are solid
It is scheduled on above concrete floor.It is vertical along concrete floor to steel plate in order to play maximization and the save the cost of mechanical advantage
Fem Computer sunykatuib analysis is carried out to direction setting spacing, table 2 is steel plate along between the setting of concrete floor longitudinal direction
Away from the ratio to promotion mechanical property, show power when steel plate is greater than 0.8m along concrete floor longitudinal direction setting spacing in table
Amplitude of variation is little when learning improving performance to be weakened, and being less than 0.7m, and comprehensive mechanical property and cost factor, steel plate is along mixed
Solidifying Tulou plate longitudinal direction setting spacing is 0.7m~0.8m.
Rubber spacer is set between concrete floor edge position concrete floor and steel plate, and rubber spacer length is
0.6~0.9m, rubber spacer width is identical as steel plate width, and rubber spacer is identical as gunite concrete thickness, and rubber pad is arranged
The effect of layer is the ductility of concrete after increasing reinforcing, and rubber spacer can play buffer function under geological process.Concrete building
The assembly of rubber spacer and gunite concrete is arranged below in plate, can be very good to resist under external force especially geological process.
The loss of prestress reduced value of bed course is whether arranged in table 1
Spacing is arranged to the ratio for promoting mechanical property in table 2
Construction procedure includes:
(1) oblique hole of embedded steel strand wires is bored in concrete floor, oblique bore dia is 3~4mm bigger than steel strand wires diameter.
Concrete floor bottom reinforcement bars protective layer is removed, the small steel plate in cushion block top is welded on concrete floor bottom reinforcement bars and is carried out
It is fixed.
(2) the vertical hole of embedded pre-stressed struts is bored in concrete floor, vertical bore dia is than pre-stressed struts diameter
Big 3~4mm.
(3) concrete column protective layer is cut in angle steel installation position, angle steel is welded in concrete column main reinforcement.It is installing
Groove is arranged in steel plate part cutting machine, and depth of groove is 100~120mm, and groove height is 14~16mm, recess width and steel
Board width is identical.
(4) prestressed stretch-draw is carried out after steel strand wires being passed through oblique hole.Steel strand tension is divided into two-stage, and the first order is 0~
30% stretching force, the second level are 30%~100% stretching force.Steel strand tension uses dual control, that is, controls the pulling force of steel strand wires, stretches
Long value.After the completion of steel strand tension, check and correction should be measured immediately.If tensioning should be suspended by noting abnormalities, arranged wait ascertain the reason and take
Tensioning is further continued for after applying.It can be using length of the steel strand wires under the effect of 20% pretightning force as original length, when tensioning is complete before tensioning
Cheng Hou measures former free portion length again, and the difference of the two is actual elongation value.
Be fixed on angle steel after prestressed stretch-draw with anchorage, finally using epoxy resin base joint grouting glue closing steel strand wires and
Gap between oblique hole.
(5) by rubber spacer fixation with steel wire on the reinforcing bar of concrete floor, pre-stressed struts are buried in vertical hole.
(6) construction gunite concrete.The wind pressure of work and injection direction, mix conveying distance, concrete matched of spraying machine
Composition and division in a proportion, water content etc. are related.Suitable wind pressure of work, it is possible to reduce springback capacity increases the thickness once sprayed, and guarantees to spray
Quality.The wind pressure of work of spraying machine will guarantee the pressure for having 0.1MPa at nozzle.
One time jet thickness is too thin, and aggregate is easily sprung back;One time jet thickness is too thick, easily occur spray-up tenesmus trickling or with
There is ghost between bottom surface in concrete floor.It is determined according to test, gunite concrete is sprayed using layering, and primary injection is thick
Degree is 25~30mm, to reduce rebound degree.When mixing accelerator, a jet thickness is 30~35mm.It mixes accelerator or uses rapid hardening
When cement, the minimum interval sprayed twice is 15~20min;Accelerator is not mixed when with ordinary cement, is sprayed twice
Minimum interval is 2~4h.It is more than 2h when interval time, should first sprays water before multiple spray wet.
Nozzle should be constantly adjusted with the fluctuation of wind pressure at a distance from by spray plane and angle.Nozzle with by spray plane
Vertical line angle uses 10~15 °, experiments have shown that this angle jeting effect is best.Nozzle can be moved along helical trajectory, spiral
Diameter is 250~300mm.
(7) concrete strength to be sprayed reaches 75% or more design strength and installs steel plate, uses epoxy after steel plate insertion groove
Resin base joint grouting glue dead air space.Pre-stressed struts weld after the embedded hole of steel plate with steel plate integral.
(8) prestressing force is applied to pre-stressed struts, pre-stressed struts top is equipped with screw thread, tightens prestressing force support by nut
The screw thread of bar applies prestressing force to pre-stressed struts, is arranged stress meter test stress situation at the top of pre-stressed struts, nut and mixed
Valve rubber is equipped between solidifying Tulou plate to avoid local stress destruction.It is sealed after prestress application using epoxy resin base joint grouting glue
Close gap between pre-stressed struts and vertical hole.
So that steel plate predeformation is occurred by prestress application of the pre-stressed struts to steel plate, is very beneficial for steel plate participation and holds
It carries.
The present invention has a safety feature, and project cost is low.
Detailed description of the invention
Fig. 1, concrete floor ruggedized construction schematic diagram.
1, steel strand wires, 2, cushion block, 3, steel plate, 4, pre-stressed struts, 5, anchorage, 6, angle steel, 7, rubber spacer, 8, injection it is mixed
Solidifying soil, 9, concrete floor, 10, concrete column.
Specific embodiment
In 9 following settings gunite concrete 8 of concrete floor in embodiment, by concrete floor 9 and sprayed by steel strand wires 1
It penetrates concrete eight to unify, steel strand wires 1 use bowl-type, and oblique part upper end is fixed on angle steel 6 by anchorage 5, oblique part
Lower extreme point position is from 1/4 that 9 end position of concrete floor is 9 span of concrete floor.Horizontal component steel strand wires 1 and concrete
Cushion block 2 is set between floor 9, and cushion block 2 is concrete blocks, and concrete square block length is 70mm, is arranged above concrete blocks
Small steel plate.Cushion block spacing uses 0.6m.Gunite concrete 8 is set between 9 bottom of steel strand wires 1 and concrete floor, sprays coagulation
Soil 8 is with a thickness of 70mm.1 following settings steel plate 3 of steel strand wires, 3 width of steel plate are 130mm, and steel plate 3 is embedded in a thickness of 13mm, steel plate 3
Pre-stressed struts 4 are arranged in concrete column 10, embedded length 110mm, steel plate 3 above, and 4 diameter of pre-stressed struts is 20mm, in advance
4 horizontal space of stress strut is 0.6m, and pre-stressed struts 4 are fixed on above concrete floor 9.Steel plate 3 is along concrete floor 9
It is 0.7m that spacing, which is arranged, in longitudinal direction.
Rubber spacer 7 is set between 9 edge position concrete floor 9 of concrete floor and steel plate 3, and rubber spacer 7 is long
Degree is 0.6m, and 7 width of rubber spacer and steel plate 3 are of same size, and rubber spacer 7 is identical as 8 thickness of gunite concrete.
Construction procedure includes:
(1) oblique hole of embedded steel strand wires 1 is bored in concrete floor 9, oblique bore dia is 3mm bigger than 1 diameter of steel strand wires.
9 bottom reinforcement bars protective layer of concrete floor is removed, the small steel plate in 2 top of cushion block is welded on 9 bottom reinforcement bars of concrete floor
It is fixed.
(2) the vertical hole of embedded pre-stressed struts 4 is bored in concrete floor 9, vertical bore dia is more straight than pre-stressed struts 4
The big 3mm of diameter.
(3) 10 protective layer of concrete column is cut in 6 installation position of angle steel, angle steel 6 is welded in 10 main reinforcement of concrete column.
Groove, depth of groove 110mm, groove height 15mm, recess width and steel plate are set with cutting machine at installation 3 position of steel plate
3 is of same size.
(4) prestressed stretch-draw is carried out after steel strand wires 1 being passed through oblique hole.1 tensioning of steel strand wires is divided into two-stage, the first order 0
~30% stretching force, the second level are 30%~100% stretching force.1 tensioning of steel strand wires uses dual control, that is, controls the drawing of steel strand wires 1
Power, stretch value.After the completion of 1 tensioning of steel strand wires, check and correction should be measured immediately.If tensioning should be suspended by noting abnormalities, wait ascertain the reason simultaneously
It is further continued for tensioning after taking measures.Before tensioning can using length of the steel strand wires 1 under the effect of 20% pretightning force as original length, when
After the completion of tensioning, former free portion length is measured again, the difference of the two is actual elongation value.
It is fixed on angle steel 6 after prestressed stretch-draw with anchorage 5, steel strand wires is finally closed using epoxy resin base joint grouting glue
Gap between 1 and oblique hole.
(5) it uses fixation with steel wire on the reinforcing bar of concrete floor 9 rubber spacer 7, buries pre-stressed struts in vertical hole
4。
(6) construction injection concrete eight.The wind pressure of work of spraying machine will guarantee the pressure for having 0.1MPa at nozzle.
Gunite concrete 8 is sprayed using layering, and a jet thickness is 25~30mm.It is primary to spray when mixing accelerator
It penetrates with a thickness of 30~35mm.It mixes accelerator or when with accelerated cement, the minimum interval sprayed twice is 15~20min;No
Accelerator is mixed when with ordinary cement, and the minimum interval sprayed twice is 2~4h.It is more than 2h when interval time, before multiple spray
It should first spray water wet.
Nozzle should be constantly adjusted with the fluctuation of wind pressure at a distance from by spray plane and angle.Nozzle with by spray plane
Vertical line angle uses 10~15 °.Nozzle is moved along helical trajectory, and screw diameter is 250~300mm.
(7) concrete eight intensity to be sprayed reaches 75% or more design strength installation steel plate 3, and steel plate 3 uses ring after being embedded in groove
Oxygen resin base joint grouting glue dead air space.Pre-stressed struts 4 weld after the embedded hole of steel plate 3 with steel plate 3 integral.
(8) prestressing force is applied to pre-stressed struts 4,4 top of pre-stressed struts is equipped with screw thread, tightens prestressing force by nut
The screw thread of strut 4 applies prestressing force to pre-stressed struts 4, and stress meter test stress situation, nut is arranged at the top of pre-stressed struts 4
Valve rubber is equipped between concrete floor 9.Pre-stressed struts 4 are closed using epoxy resin base joint grouting glue after prestress application
The gap between vertical hole.