CN206941513U - A kind of structure for New-old concrete layer adhesion - Google Patents

A kind of structure for New-old concrete layer adhesion Download PDF

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Publication number
CN206941513U
CN206941513U CN201720676841.3U CN201720676841U CN206941513U CN 206941513 U CN206941513 U CN 206941513U CN 201720676841 U CN201720676841 U CN 201720676841U CN 206941513 U CN206941513 U CN 206941513U
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China
Prior art keywords
keyway
old concrete
new
dam
dam facing
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CN201720676841.3U
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Chinese (zh)
Inventor
李波
居浩
周浩
高传彬
李刚
郑晓晖
陈波
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PowerChina Guiyang Engineering Corp Ltd
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PowerChina Guiyang Engineering Corp Ltd
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Abstract

The utility model discloses a kind of structure for New-old concrete layer adhesion, including between upstream dam facing (1) and downstream dam facing (2), and the first copper waterstop (31) and the second copper waterstop (32) arranged respectively along upstream dam facing (1) and downstream dam facing (2);Truncated rectangular pyramids shape keyway (4) array connected two-by-two is disposed with dam facing region between first copper waterstop (31) and the second copper waterstop (32), and the concave and convex direction of adjacent truncated rectangular pyramids shape keyway (4) is on the contrary, be provided with joint bar (5) on the top surface of truncated rectangular pyramids shape keyway (4).The utility model is solved after concrete dam increases, New-old concrete layer adhesion is close, complete, interlayer is avoided the problems such as sliding, seepage occur, the effective young concrete that avoids occurs sliding or interlayer leakage problems in old concrete face, it ensure that New-old concrete coaction, it is ensured that dam body and dam foundation stress after increasing meet code requirement.

Description

A kind of structure for New-old concrete layer adhesion
Technical field
It the utility model is related to the water of Hydraulic and Hydro-Power Engineering technical field, more particularly, to New-old concrete layer adhesion Sharp hydroelectric project field.
Background technology
Aspect has obvious layered, especially horizontal bedding in structure, be influence concrete dam intensity, it is stable and The key position of seepage flow.In recent years, dam heightening is clearly proposed for a collection of Strengthening Project, some of concrete dams. A large amount of simulation calculations and site test results show, need solve New-old concrete aspect first in concrete dam dam heightening works Combination problem, it is ensured that New-old concrete coaction, it is ensured that dam body stress after increasing, deformation are satisfied by code requirement, and The crack that young concrete produces crack, especially harmfulness because of temperature shrinkage and between old concrete is reduced as far as possible. In addition, young concrete deformation modulus etc. should be as consistent with old concrete as possible, so as to compatibility of deformation, avoid producing dam body Adverse effect.
Concrete layer combines at present typically completes by dabbing, joint bar or the methods of laying keyway, and keyway arrangement is usual It is that stream or Transverse to the flow direction are and discontinuous in ribbon distribution downstream, there is that New-old concrete layer adhesion is unstable, oozes The hidden danger such as leakage, once leakage problems occurs in interlayer, the later stage is handled by engineering measures such as chemical groutings, and workload is big, takes With height, and as time went on, it is possible to which seepage occurs in place repeatedly.
The content of the invention
The purpose of this utility model is:A kind of structure for New-old concrete layer adhesion is provided, solves concrete dam After increasing, New-old concrete layer adhesion is close, complete, avoids interlayer from the problems such as sliding, seepage occur, effectively avoids new Casting concrete occurs sliding in old concrete face or interlayer leakage problems, it is ensured that New-old concrete coaction, it is ensured that increase Dam body and dam foundation stress afterwards meets code requirement, dam safety.
The technical solution of the utility model is as follows:
A kind of structure for New-old concrete layer adhesion, including between upstream dam facing and downstream dam facing, and point The first copper waterstop and the second copper waterstop do not arranged along upstream dam facing and downstream dam facing;
Truncated rectangular pyramids shape key connected two-by-two is disposed with dam facing region between first copper waterstop and the second copper waterstop Groove array, and the concave and convex direction of adjacent truncated rectangular pyramids shape keyway on the top surface of truncated rectangular pyramids shape keyway on the contrary, be provided with joint bar.Two two-phases Truncated rectangular pyramids shape keyway array even forms continuous keyway, is substantially distinguished from discontinuous and in zonal distribution in the prior art Keyway is set.Because keyway is tetrahedron, any angle has certain angle with water (flow) direction, therefore without to array and water Stream direction specially requires.
Keyway in the keyway array is the equal positive truncated rectangular pyramids of volume, and keyway top surface is distributed in square net At node.Square net herein refer to a plurality of horizontal direction parallel and equally spaced lines it is parallel with a plurality of vertical direction and The intersecting grid formed of equally spaced lines (horizontal interval is equal with vertical spacing).
The depth of the keyway is 10cm, i.e. truncated rectangular pyramids height.
The surrounding slope ratio of the keyway is 1:3.
The length of the joint bar is 3m, protruded length 1.5m.
First copper waterstop is apart from upstream dam facing at intervals of 50cm, and second copper waterstop is apart from downstream dam facing At intervals of 50cm.
Lay 2~3cm solid cements slurry or cement mortar on the keyway face arranged on old concrete surface, mortar it is strong Spending grade should be than the high one-level of institute's casting concrete intensity.
The utility model passes through paving by setting keyway, the equally distributed joint bar of concavo-convex distribution in old concrete face It if cement mortar, may be such that young concrete is engaged closely with old concrete, and avoid because New-old concrete unbalance stress Slid between appearance aspect, and arrange sealing, interlayer seepage can be avoided.
Compared with prior art, one kind described in the utility model is used for dam heightening New-old concrete layer adhesion structure Difference embody in the following areas:
1. by digging inverted trapezoidal keyway under old concrete surface so that the concavo-convex distribution of old concrete surface keyway presentation, It is in picturesque disorder.Inverted trapezoidal keyway depth can use 20cm, and surrounding slope is than 1:3, keyway bottom 20cm × 20cm;
2. laying joint bar in the keyway of bumps distribution, length can use 3m, exposed 1.5m;
3. at Parallel to the flow direction dam body upstream and downstream 50cm, one of Copper water stop is respectively provided with, can be by machine cuts grooving, will Sealing is implanted into old concrete;
4. 2~3cm solid cements slurry or cement mortar are laid on the keyway face arranged on old concrete surface, mortar Strength grade should be than the high one-level of institute's casting concrete intensity, and the area of laying mortar should mutually fit with concreting intensity every time Should, laying process should ensure that novel concrete is well combined with old concrete seam face;
5. young concrete should should be completed to cover before the cement or cement mortar initial set that old concrete aspect is laid, And young concrete elastic mould value is close to old concrete bullet mould;
Arranged more than, New-old concrete can be engaged closely by rough keyway along aspect, avoid newly pouring Concrete slides in old concrete face along water (flow) direction or axis of dam direction, is connected by anchor pole, upstream and downstream sealing The a series of measures such as the cement mortar laid and laid make it that New-old concrete anchoring is close, Coating combination is good, barrier layer Face seepage.
Brief description of the drawings
Fig. 1 is cross-sectional view of the present utility model;
Fig. 2 is the utility model Parallel to the flow direction cross-sectional view;
Fig. 3 and Fig. 4 is the utility model keyway 3-D effect schematic diagram.
In figure:1- upstreams dam facing, 2- downstreams dam facing, the copper waterstops of 31- first, the copper waterstops of 32- second, 4- keyways, 5- Joint bar, arrow are water (flow) direction.
Embodiment
1~4 further describe arrangement form of the present utility model below in conjunction with the accompanying drawings, but claimed scope not office It is limited to described.As shown in figure 1, a kind of be used for dam heightening New-old concrete layer adhesion structure, including upstream dam facing 1, downstream Dam facing 2, the first copper waterstop 31, the second copper waterstop 32, keyway 4, joint bar 5.
The first copper waterstop 31 together at 50cm, is being arranged at upstream dam facing 1;In the 50cm at downstream dam facing 2 Place, same one of second copper waterstop 32 of arrangement.In the dam facing region between having arranged upstream and downstream Copper water stop, lower digging keyway 4, As shown in Fig. 2 adjacent keyway 4 forms inverted trapezoidal Keyway Section, depth 20cm, surrounding slope is than 1:3, ultimately form two-by-two be connected and The opposite positive truncated rectangular pyramids array of concave and convex direction.Whole old concrete dam facing keyway 4, which is arranged, is presented concavo-convex distribution, in picturesque disorder, ring Ring interlocks.Joint bar 5, the length of joint bar 5 optional 3m, exposed 1.5m are set at the concavo-convex position of keyway 4.Arranged on old concrete surface The face of keyway 4 on lay 2~3cm solid cements slurry or cement mortar, the strength grade of mortar should be than institute's casting concrete intensity High one-level, and every time laying mortar area should be adapted with concreting intensity, laying process should ensure that novel concrete with Old concrete seam face is well combined.Young concrete should be before the cement or cement mortar initial set that old concrete aspect is laid It should complete to cover, and young concrete elastic mould value is close to old concrete bullet mould.
Arranged more than, New-old concrete can be engaged closely by rough keyway 4 along aspect, avoid newly pouring Concrete slides in old concrete face along water (flow) direction or axis of dam direction, is connected by anchor pole, upstream and downstream sealing The a series of measures such as the cement mortar laid and laid make it that New-old concrete anchoring is close, Coating combination is good, barrier layer Face seepage, there is certain promotional value.

Claims (6)

  1. A kind of 1. structure for New-old concrete layer adhesion, it is characterised in that:Including positioned at upstream dam facing (1) and downstream dam Between face (2), and the first copper waterstop (31) and the second Copper water stop arranged respectively along upstream dam facing (1) and downstream dam facing (2) Band (32);
    Truncated rectangular pyramids connected two-by-two are disposed with dam facing region between first copper waterstop (31) and the second copper waterstop (32) Shape keyway (4) array, and the concave and convex direction of adjacent truncated rectangular pyramids shape keyway (4) on the top surface of truncated rectangular pyramids shape keyway (4) on the contrary, set There is joint bar (5).
  2. A kind of 2. structure for New-old concrete layer adhesion according to claim 1, it is characterised in that:The keyway (4) keyway in array (4) is the equal positive truncated rectangular pyramids of volume, and keyway (4) top surface is distributed at the node of square net.
  3. A kind of 3. structure for New-old concrete layer adhesion according to claim 2, it is characterised in that:The keyway (4) depth is 10cm.
  4. A kind of 4. structure for New-old concrete layer adhesion according to claim 2, it is characterised in that:The keyway (4) surrounding slope ratio is 1:3.
  5. A kind of 5. structure for New-old concrete layer adhesion according to claim 1, it is characterised in that:The joint bar (5) length is 3m, protruded length 1.5m.
  6. A kind of 6. structure for New-old concrete layer adhesion according to claim 1, it is characterised in that:Described first Copper waterstop (31) is apart from upstream dam facing (1) at intervals of 50cm, and second copper waterstop (32) is apart from downstream dam facing (2) At intervals of 50cm.
CN201720676841.3U 2017-06-12 2017-06-12 A kind of structure for New-old concrete layer adhesion Active CN206941513U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720676841.3U CN206941513U (en) 2017-06-12 2017-06-12 A kind of structure for New-old concrete layer adhesion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201720676841.3U CN206941513U (en) 2017-06-12 2017-06-12 A kind of structure for New-old concrete layer adhesion

Publications (1)

Publication Number Publication Date
CN206941513U true CN206941513U (en) 2018-01-30

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109537596A (en) * 2018-12-24 2019-03-29 中水电第十工程局(郑州)有限公司 A kind of concrete gravity dam divides storehouse to disengage pouring construction method
CN113089584A (en) * 2021-03-18 2021-07-09 中国水利水电第九工程局有限公司 Construction method of soil dam heightening anti-seepage PVC geomembrane

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109537596A (en) * 2018-12-24 2019-03-29 中水电第十工程局(郑州)有限公司 A kind of concrete gravity dam divides storehouse to disengage pouring construction method
CN113089584A (en) * 2021-03-18 2021-07-09 中国水利水电第九工程局有限公司 Construction method of soil dam heightening anti-seepage PVC geomembrane

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