CN101349078A - Bamboo reinforcement rammed earth wall building technique - Google Patents

Abstract

The invention relates to a bamboo reinforcement rammed earth wall building technology, belonging to the field of civil engineering, in particular to the technical field of earth building construction. During the prior construction of rammed earth walls, the distribution of bamboo strips are not controlled, so the bamboo reinforcement layer of the wall body becomes a weak link and does not bring into real play the tensile capability of rammed earth wall-inside horizontal stress bamboo reinforcement. The bamboo reinforcement rammed earth wall building technology comprises a rammed earth wall body and bamboo reinforcements, and during the conventional rammed earth building construction, the bamboo reinforcements are arranged on the cross section of the wall body according to proper reinforcement ratio, so that the shock strength of the wall body is obviously improved. The building technology is worth promotion and application for new buildings in rural areas.

Description

Bamboo reinforcement rammed earth wall building technique

Technical field

The present invention relates to a kind of bamboo reinforcement rammed earth wall building technique, belong to the immature soil house and the building technology field, civil structure house (comprising the rammed earth wall building) of civil engineering.

Background technology

Earth building is at vast rural area ubiquity.As traditional immature soil body of wall of load-bearing and maintenance, in all previous earthquake, destroy the most serious.Though the minority body of wall is furnished with bamboo reinforcement, lack reasonably design and build (bamboo reinforcement configuration quantity and position are improper, and the bamboo reinforcement anchoring is improper etc.), and do not reach expected effect, become body of wall antidetonation weak link.Modern reinforced concrete shear wall (seismic structural wall, earthquake resistant wall) building technology is told us, and reasonably design of reinforcement and corresponding construction measure can make body of wall have very high ductility and antidetonation bearing capacity.Test and calculating show, dispose rational bamboo reinforcement and corresponding construction measure by being controlled at rammed earth wall, can reach the ductility and the antidetonation bearing capacity that improve immature soil body of wall.

Summary of the invention:

The object of the invention is exactly in order to overcome rammed earth wall becomes weak link without the bamboo reinforcement layer of specialized designs or verification experimental verification problem, the tension effect of the stressed bamboo reinforcement of level in the real performance rammed earth wall, improve the effect (promptly improve rammed earth wall opposing horizontal earthquake action ability as lateral resistant member) of traditional rammed earth wall opposing, and then improve the anti-seismic performance of traditional rammed earth wall house integral body from the horizontal earthquake component in the face.

Bamboo reinforcement rammed earth wall building technique of the present invention is: comprise body of wall (5) and bamboo reinforcement, it is characterized in that: body of wall (5) thickness is t, the quantity of every layer of stressed bamboo reinforcement of configuration level is n row, horizontal bamboo reinforcement (1) is arranged n=t/100 row along the wall thickness direction, the bamboo bar that the stressed bamboo reinforcement of level (1) cross section 10mm is wide, 4mm is thick, row spacing be 100mm, with the exterior wall back gauge be 50mm; It is 5mm * 5mm that thickness connects bamboo reinforcement (3) cross sectional dimensions, length is the bamboo bar of 300mm, along body of wall (5) thickness direction and the stressed bamboo reinforcement of level (1) square crossing, press 600 equidistant placement along body of wall (5) width, the connection bamboo reinforcement (3) at two ends is 100mm with body of wall width exterior wall limit spacing, the stressed bamboo reinforcement of level (1) be connected with thickness bamboo reinforcement layer that bamboo reinforcement (3) forms along body of wall (5) short transverse according to spacing 200mm layered arrangement, first floor bamboo reinforcement is apart from basic end face 300mm; Vertical anchoring bamboo reinforcement (2) cross sectional dimensions is 5mm * 5mm, length is the bamboo bar of 300mm, vertical anchoring bamboo reinforcement (2) is arranged vertically n row along thickness of wall body direction and the stressed bamboo reinforcement of level, be connected vertical connection of bamboo reinforcement layer of bamboo reinforcement (3) with thickness in the stressed bamboo reinforcement of bamboo reinforcement midpoint and level (1), three kinds of bamboo reinforcement infalls are fixed with straw (4) or iron wire or other material colligation.

The minimum steel ratio of bamboo reinforcement is 0.024%, and maximum reinforcement ratio is 0.511%.

Bamboo reinforcement rammed earth wall building technique is the theoretical product that combines with test that calculates.The bamboo reinforcement quantity (promptly asking reinforcement ratio) by calculating required laying in the rammed earth wall at first, excessive or too small reinforcement ratio can cause in the middle of the similar concrete structure overreinforced or few muscle to destroy.Specifically, bamboo reinforcement rammed earth wall bamboo bar too much causes at first destroying at this layer, and the bamboo bar is just insignificant to the contribution of whole body of wall at least excessively.So find the rational reinforcement ratio scope particular importance that seems.Below be computational process and technical scheme:

One, the calculating of minimum steel ratio

Suppose: f _yWith f _cBe respectively the normal intensity of reinforcing bar and concrete; F ' _yWith f ' _cBe respectively the normal intensity of bamboo reinforcement and sun-dried mud brick.A _SWith A ' _sBe respectively the section area of reinforcing bar and bamboo reinforcement; A and A ' are respectively the cross section gross area of steel bar concrete seismic structural wall, earthquake resistant wall and bamboo reinforcement adobe wall.

$\frac{A_S}{A}=\frac{\frac{f_y^{\′}{A}_s^{\′}}{f_y}}{\frac{f_c^{\′}{A}^{\′}}{f_c}}\≥0.2\%$ (the horizontal steel bar rate of steel bar concrete seismic structural wall, earthquake resistant wall)

Order: ${\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A20081005882700081.png"\; state="\{\{state\}\}">C</figure-callout>}}_1=\frac{f_y^{\&prime;}}{f_y}=\frac{234.8N/{\mathrm{<figure-callout\; id="2"\; label="mm"\; filenames="A20081005882700081.png"\; state="\{\{state\}\}">mm</figure-callout>}}^2}{235N/{\mathrm{<figure-callout\; id="2"\; label="mm"\; filenames="A20081005882700081.png"\; state="\{\{state\}\}">mm</figure-callout>}}^2}=0.99$

${\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="A20081005882700081.png"\; state="\{\{state\}\}">C</figure-callout>}}_2=\frac{f_c^{\&prime;}}{f_c}=\frac{1.6N/{\mathrm{<figure-callout\; id="2"\; label="mm"\; filenames="A20081005882700081.png"\; state="\{\{state\}\}">mm</figure-callout>}}^2}{13.4N/{\mathrm{<figure-callout\; id="2"\; label="mm"\; filenames="A20081005882700081.png"\; state="\{\{state\}\}">mm</figure-callout>}}^2}=0.12$

Then: $\frac{A_s}{A}=\frac{C_1{A}_S^{\&prime;}}{C_2{A}^{\&prime;}}\&GreaterEqual;0.2\%$

$\frac{A_S^{\&prime;}}{A^{\&prime;}}\&GreaterEqual;0.024\%$

Promptly calculate to such an extent that the minimum steel ratio of rammed earth wall is 0.024% by seismic structural wall, earthquake resistant wall 0.2% horizontal steel bar rate

Two, maximum reinforcement ratio is calculated

The horizontal bamboo reinforcement of bamboo reinforcement rammed earth wall is 200mm along the high spacing of wall, apart from bamboo reinforcement layer top and bottom 100mm retrieval unit layer.Suppose that the tension bearing capacity of the horizontal bamboo reinforcement of this elementary layer equals the horizontal shear-carrying capacity of half soil body, for calculating the critical condition of maximum reinforcement ratio.Because learnt by test, wall body slit is at first carried out to approximately along body of wall length l direction midpoint, and then bamboo reinforcement is just started working, so get half long calculating.Design formulas is as follows:

F＝f _y·A

$V=t\&CenterDot;\frac{\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="A20081005882700081.png"\; state="\{\{state\}\}">l</figure-callout>}}{2}\&CenterDot;\mathrm{\&tau;}$

$F=V$

$\&DoubleRightArrow;{\mathrm{\&rho;}}_{\max }=\frac{A}{200t}=\frac{l\&CenterDot;\mathrm{\&tau;}}{{2f}_y\&times;200}=\frac{1600\&times;0.3}{2\&times;234.8\&times;200}=0.511\%$

(wherein: A is the cross-sectional area of elementary layer, and t is a wall thickness, and l is examination

Test the wall length of a film, τ is native shear strength, f _yBe bamboo reinforcement tensile strength.)

So far, to go out the minimum steel ratio of rammed earth wall be 0.024% to primary Calculation, and maximum reinforcement ratio is 0.511%.Reinforcement ratio is comparatively rational between 0.024% to 0.511%.

In the middle of actual engineering, the most general rammed earth wall thickness is 600mm, for being applicable to different wall thicknesses, make that wall thickness is t, then every layer need bamboo reinforcement quantity be n=t/100 row, the cross sectional dimensions of the stressed bamboo reinforcement of level is 4mm * 10mm, and evenly arrange along the wall thickness direction, the stressed bamboo reinforcement of every row of horizontal is along the elongated layout of wall length direction (extensible when length is not enough, suitable 100mm～the 200mm of lap length, and with straw or iron wire or the 4 firm colligations of other colligation material), attention will be imbedded along bamboo bar width and ram in the soil.The stressed bamboo reinforcement of level row spacing is 100mm, with the exterior wall back gauge be 50mm.The cross sectional dimensions that thickness connects bamboo reinforcement is 5mm * 5mm, and long is 300mm, along thickness of wall body direction and the stressed bamboo reinforcement square crossing of level, presses the 600mm equidistant placement along the body of wall width, and the connection bamboo reinforcement 3 and the body of wall width exterior wall limit spacing at two ends are 100mm.The stressed bamboo reinforcement of level be connected with thickness bamboo reinforcement layer that bamboo reinforcement forms along the body of wall short transverse according to spacing 200mm layered arrangement, but first floor bamboo reinforcement is apart from basic end face 300mm.The cross sectional dimensions of vertical anchoring bamboo reinforcement is 5mm * 5mm, and long is 300mm.Vertical anchoring bamboo reinforcement is arranged vertically n row along thickness of wall body direction and the stressed bamboo reinforcement of level, is connected vertical connection of bamboo reinforcement layer of bamboo reinforcement with thickness in the stressed bamboo reinforcement of bamboo reinforcement midpoint and level.Horizontal bamboo reinforcement, vertical anchoring bamboo reinforcement are connected bamboo reinforcement node place to be fixed with straw or iron wire or other colligation material with thickness.

Bamboo reinforcement rammed earth wall building technique of the present invention, its reinforcement ratio is configured through after the calculating of science, making that the level of rammed earth wall is stressed strengthens greatly, anti seismic efficiency is remarkable, make things convenient for not only that the resident draws materials, economy, popularize easily, and do not pollute the environment after discarded, really guaranteeing the environmental protection of novel cob, is to alleviate the approach that the world today faces resource exhaustion, ecological deterioration dual-pressure.

Bamboo reinforcement rammed earth wall building technique of the present invention, it comprises rammed earth wall body and bamboo reinforcement, is that wall section is arranged bamboo reinforcement according to suitable reinforcement ratio, makes the shock strength of body of wall obviously improve in traditional cob construction.This building technology is worth applying when the newly-built house in rural area.

Description of drawings

Fig. 1 is the elementary layer schematic diagram that calculates the maximum reinforcement ratio intercepting of the horizontal bamboo reinforcement of rammed earth wall;

Fig. 2 is the vertical view that the stressed bamboo reinforcement of rammed earth wall level is arranged;

Fig. 3 is the cross-sectional view that the stressed bamboo reinforcement of rammed earth wall level is arranged;

Fig. 4 is the connection detail drawing that the stressed bamboo reinforcement of rammed earth wall level, vertical anchoring bamboo reinforcement and thickness connect bamboo reinforcement.

Among the figure: 1. the stressed bamboo reinforcement of level; 2. vertical anchoring bamboo reinforcement; 3. thickness connects bamboo reinforcement; 4. colligation material; 5. body of wall; 6. desirable crack.

The specific embodiment:

Bamboo reinforcement rammed earth wall building technique comprises body of wall 5 and bamboo reinforcement, and every layer of quantity of reinforcement of body of wall can be determined according to the difference of thickness of wall body t.Horizontal bamboo reinforcement 1 is arranged along the wall thickness direction, every layer needs bamboo reinforcement quantity is n=t/100 row, and stressed bamboo reinforcement 1 cross section of level is the bamboo bar that 10mm is wide, 4mm is thick, the too narrow too thin manual processing that is not easy, too thickly too slightly be not easy to control reinforcement ratio, so by repeatedly attempting fixing this size.The stressed bamboo reinforcement of level 1 row's spacing is 100mm, with the exterior wall back gauge be 50mm.It is 5mm * 5mm that thickness connects bamboo reinforcement 3 cross sectional dimensions, length is the bamboo bar of 300mm, along body of wall 5 thickness directions and stressed bamboo reinforcement 1 square crossing of level, press the 600mm equidistant placement along body of wall 5 width, the connection bamboo reinforcement 3 and the body of wall width exterior wall limit spacing at two ends are 100mm.The stressed bamboo reinforcement 1 of level be connected with thickness bamboo reinforcement layer that bamboo reinforcement 3 forms along body of wall 5 short transverses according to spacing 200mm layered arrangement, but first floor bamboo reinforcement is apart from basic end face 300mm.Vertical anchoring bamboo reinforcement 2 cross sectional dimensions are 5mm * 5mm, and long is 300mm.Vertical anchoring bamboo reinforcement 2 is arranged vertically n row along thickness of wall body direction and the stressed bamboo reinforcement of level, is connected vertical connection of bamboo reinforcement layer of bamboo reinforcement 3 with thickness in the stressed bamboo reinforcement 1 of bamboo reinforcement midpoint and level.Three class bamboo reinforcement node places use straw or iron wire or other colligation material 4 fixing.As thickness of wall body t is 600mm, and then n is 6 rows.Vertical anchoring bamboo reinforcement 2 is a lot of than stressed bamboo reinforcement 1 weak point of level, the length of getting 300mm is because compare with elongated perpendicular muscle, though can not constitute globality well " bamboo reinforcement rack ", but also can reach the effect of the stressed bamboo reinforcement 1 of fixed level that requires in advance, elementary layer also has the 100mm lap length up and down.The stressed bamboo reinforcement 1 of level has been shared the rammed earth wall lateral resisting, and can with the co-ordination well of plain soil, vertical anchoring bamboo reinforcement 2 plays the effect of the stressed bamboo reinforcement 1 of fixed level, make it under the side direction effect, be unlikely to slippage and lost efficacy, fully the stressed bamboo reinforcement of assurance level is brought into play due effect, thereby improve rammed earth wall opposing horizontal earthquake action ability, and then improve the anti-seismic performance of traditional rammed earth wall house integral body as lateral resistant member.

The wooden model height of rammed earth wall is 300mm, before building, earlier straw was soaked 1 to 2 hour by rammer, ram then and build the thick elementary layer of bottom 300mm, bamboo reinforcement position (wherein the layout of vertical anchoring bamboo reinforcement with the reinforcing bar punching, is inserted vertical bamboo reinforcement again and tamped hole earlier) is reserved on the native surface after compacting.The rammer process of building will be estimated the surface dust requirement, avoids surface dust to make troubles too much.Will be after rammer is built and finished according to weather condition maintenance 1 to 2 months.

Claims (2)

1. bamboo reinforcement rammed earth wall building technique, comprise body of wall (5) and bamboo reinforcement, it is characterized in that: body of wall (5) thickness is t, the quantity of every layer of stressed bamboo reinforcement of configuration level is n row, horizontal bamboo reinforcement (1) is arranged n=t/100 row along the wall thickness direction, the bamboo bar that the stressed bamboo reinforcement of level (1) cross section 10mm is wide, 4mm is thick, row spacing be 100mm, with the exterior wall back gauge be 50mm; It is 5mm * 5mm that thickness connects bamboo reinforcement (3) cross sectional dimensions, length is the bamboo bar of 300mm, along body of wall (5) thickness direction and the stressed bamboo reinforcement of level (1) square crossing, press 600 equidistant placement along body of wall (5) width, the connection bamboo reinforcement (3) at two ends is 100mm with body of wall width exterior wall limit spacing, the stressed bamboo reinforcement of level (1) be connected with thickness bamboo reinforcement layer that bamboo reinforcement (3) forms along body of wall (5) short transverse according to spacing 200mm layered arrangement, first floor bamboo reinforcement is apart from basic end face 300mm; Vertical anchoring bamboo reinforcement (2) cross sectional dimensions is 5mm * 5mm, length is the bamboo bar of 300mm, vertical anchoring bamboo reinforcement (2) is arranged vertically n row along thickness of wall body direction and the stressed bamboo reinforcement of level, be connected vertical connection of bamboo reinforcement layer of bamboo reinforcement (3) with thickness in the stressed bamboo reinforcement of bamboo reinforcement midpoint and level (1), three kinds of bamboo reinforcement infalls are fixed with straw (4) or iron wire or other material colligation.

2. bamboo reinforcement rammed earth wall building technique according to claim 1 is characterized in that: the minimum steel ratio of bamboo reinforcement is 0.024%, and maximum reinforcement ratio is 0.511%.

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