CN214883899U - A high-performance connection structure for new and old concrete joints - Google Patents
A high-performance connection structure for new and old concrete joints Download PDFInfo
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- CN214883899U CN214883899U CN202120633280.5U CN202120633280U CN214883899U CN 214883899 U CN214883899 U CN 214883899U CN 202120633280 U CN202120633280 U CN 202120633280U CN 214883899 U CN214883899 U CN 214883899U
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- 239000004567 concrete Substances 0.000 title claims abstract description 147
- 238000004078 waterproofing Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 66
- 239000000463 material Substances 0.000 claims description 27
- 239000011376 self-consolidating concrete Substances 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 229920001971 elastomer Polymers 0.000 claims description 8
- 229920005549 butyl rubber Polymers 0.000 claims description 4
- 239000002313 adhesive film Substances 0.000 claims description 3
- 229920002397 thermoplastic olefin Polymers 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims 8
- 229920000642 polymer Polymers 0.000 claims 1
- 230000007123 defense Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 230000008595 infiltration Effects 0.000 abstract description 3
- 238000001764 infiltration Methods 0.000 abstract description 3
- 239000003673 groundwater Substances 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 46
- 238000010276 construction Methods 0.000 description 14
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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Abstract
本实用新型提供了一种新老混凝土接头部位高性能连接结构，包括老混凝土，老混凝土一侧连接有新混凝土；老混凝土和新混凝土的底部设有基底防水层；老混凝土连接新混凝土的侧面的梯形槽中填充中部防水层；老混凝土底部的楔型缺口中填充新混凝土；老混凝土和新混凝土的连接处开设有用于放置止水条的止水凹槽，止水凹槽位于梯形槽上方；老混凝土的侧面上涂有混凝土接缝自防水层。本实用新型通过设置基底防水层、混凝土接缝自防水层、中部防水层、止水条沿地下水渗透路径构筑了四道止水防线，接头部位抗渗性能优异。而且具有整体造价偏低、工序灵活可调、适用范围较广等特点。
The utility model provides a high-performance connection structure for joint parts of new and old concrete, which comprises old concrete, one side of the old concrete is connected with new concrete; the bottom of the old concrete and the new concrete is provided with a base waterproof layer; the side of the old concrete is connected with the new concrete The trapezoidal groove is filled with the middle waterproof layer; the wedge-shaped gap at the bottom of the old concrete is filled with new concrete; the connection between the old concrete and the new concrete is provided with a water-stop groove for placing the water-stop strip, and the water-stop groove is located above the trapezoidal groove. ; The sides of the old concrete are coated with a concrete joint self-waterproofing layer. The utility model constructs four water-proof defense lines along the groundwater infiltration path by arranging the base waterproof layer, the concrete joint self-waterproof layer, the middle waterproof layer and the water-stop strip, and the joint part has excellent anti-seepage performance. And it has the characteristics of low overall cost, flexible and adjustable process, and wide application range.
Description
Technical Field
The utility model relates to a concrete waterproof technical field, concretely relates to new and old concrete joint position high performance connection structure.
Background
Due to the discontinuity of the structural form and the material, the mechanical property of the interface of the new cast-in-place concrete joint and the old cast-in-place concrete joint is poor, tension and compression cracks are easy to generate, and further the leakage of an underground structure is easy to induce under high water pressure. Scholars at home and abroad conduct numerous researches on detailed waterproof structures of underground structures at joints of structures such as construction joints and the like, and provide a multi-layer waterproof joint concept, namely, leakage hidden danger at joints of new and old cast-in-place concrete is solved by setting a plurality of waterproof control schemes.
The detailed joint water prevention of the new concrete and the old concrete is the same as the construction joint water prevention measures, and the water stop belt, the water stop strip, the caulking material, the sealing material, the waterproof coating and the like are used for realizing the water prevention treatment at the weak interface. However, because of the factors such as large difference of material properties and poor interface adhesion of new and old concrete interfaces, a more reliable seam treatment scheme needs to be provided in a targeted manner to ensure the reliability and durability of engineering waterproofing.
In view of the above, a high-performance connection structure for new and old concrete joint parts is urgently needed to solve the problems in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a new and old concrete joint position high performance connection structure solves current new and old cast in situ concrete and connects the problem that is difficult to guarantee waterproof reliability, durability under the high osmotic pressure.
In order to realize the purpose, the utility model provides a high-performance connecting structure for the joint part of new and old concrete, which comprises old concrete, wherein one side of the old concrete is connected with the new concrete; the bottoms of the old concrete and the new concrete are provided with a substrate waterproof layer; the side surface of the old concrete, which is connected with the new concrete, is provided with a trapezoidal groove, and a middle waterproof layer is filled in the trapezoidal groove; the bottom of the old concrete is a wedge-shaped gap, and the wedge-shaped gap is filled with new concrete; a water stopping groove is formed at the joint of the old concrete and the new concrete, is positioned above the trapezoidal groove and is used for placing a water stopping strip; and a concrete joint self-waterproof layer is coated on the side surface where the old concrete and the new concrete are connected.
Further, the substrate waterproof layer comprises an upper concrete cushion layer, a lower concrete cushion layer, a waterproof coiled material and a substrate water stop belt; the lower concrete cushion layer, the waterproof coiled material and the base water stop are sequentially laid from bottom to top, and the base water stop is positioned below the new concrete at the wedge-shaped gap; the upper concrete cushion layer is laid on the lower concrete cushion layer and is positioned around the waterproof coiled material and the base water stop belt for protecting the waterproof coiled material and the base water stop belt.
Furthermore, the waterproof roll material is a thermoplastic polyolefin waterproof roll material or a macromolecular self-adhesive film waterproof roll material, two adjacent waterproof roll materials are overlapped by an upper layer and a lower layer in a staggered joint mode, and the overlapping width is not less than 100 mm.
Further, the base water stop belt is a back-attached rubber water stop belt.
Furthermore, the self-waterproof layer of the concrete joint adopts cement-based capillary crystalline waterproof coating or cement paste which has the same mixing ratio with new concrete and is doped with 10% of U-shaped expanding agent.
Furthermore, the middle waterproof layer comprises high-performance self-compacting concrete and a buried water stop embedded in the high-performance self-compacting concrete.
Further, the end of the medium-buried water stop belt is wrapped with the water-swelling putty block; the embedded water stops are lapped by rivets, and butyl rubber putty is clamped between the two overlapped embedded water stops.
Further, the water stop strip adopts a water-swelling rubber strip.
Use the technical scheme of the utility model, following beneficial effect has:
(1) the joint has excellent waterproof performance. The utility model discloses a set up basement waterproof layer, concrete seam from waterproof layer, middle part waterproof layer, sealing strip along groundwater infiltration route and constructed four stagnant water lines of defence, the impervious performance in joint position is excellent.
(2) The joint connection performance is excellent. The sand blasting/chiseling treatment is carried out on the connection interface of the new concrete and the old concrete, and the excellent self-repairing healing performance of the cement-based permeable crystalline waterproof coating improves the anti-permeability performance and the mechanical property of the joint and effectively prevents the joint from cracking in the later period.
(3) The whole cost is low. The self-waterproof layer and the middle waterproof layer are used as main water-stop waterproof lines, a small amount of high-cost waterproof paint and high-performance concrete are locally used in construction, and the overall cost is controlled in a lower range.
(4) The construction is convenient and fast, and the bottom crossing on site is easy. This joint structure need not to use special instrument and the construction that becomes more meticulous is controlled, only can construct through the instrument of picking the chisel and pouring the template commonly used, and the construction operation degree of difficulty that has effectively reduced is convenient for the site operation to hand over end and quality and is controlled.
(5) The working procedure is flexible and adjustable. Has sufficient waterproof allowance, and can flexibly and properly delete part of procedures according to the field condition in actual construction.
(6) Has wide application range. The construction method can be used for the joint parts of new and old concrete, and can also be used for the construction joints, post-cast strips and other parts of large underground engineering.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is an overall schematic view of a high performance joint construction for new and old concrete joint locations;
FIG. 2 is an enlarged partial schematic view of A of FIG. 1;
the waterproof structure comprises a base waterproof layer 1, an upper concrete cushion layer 11, a waterproof coiled material 12, a base water stop belt 13, a lower concrete cushion layer 14 and a waterproof layer, wherein the base waterproof layer is arranged on the upper concrete cushion layer; 2. the concrete joint is self-waterproof; 3-middle waterproof layer 31, self-compacting concrete 32, middle buried water stop; 4. a water stop bar; 5. old concrete; 6. new concrete.
Detailed Description
The embodiments of the invention will be described in detail hereinafter with reference to the accompanying drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Example 1:
referring to fig. 1 and 2, a high-performance connection structure for a joint part of old and new concrete comprises old concrete 5, wherein one side of the old concrete 5 is connected with new concrete 6; the bottom parts of the old concrete 5 and the new concrete 6 are provided with a base waterproof layer 1 for resisting the infiltration and corrosion of most underground water and constructing a waterproof first defense line of the new and old concrete joints; the side face of the old concrete 5 connected with the new concrete 6 is provided with a trapezoidal groove, and a middle waterproof layer 3 is filled in the trapezoidal groove and used for resisting a small amount of underground water permeating into the joint gap and constructing a waterproof main defense line of the new and old concrete joint; the bottom of the old concrete 5 is a wedge-shaped gap, and the wedge-shaped gap is filled with new concrete 6; a water stopping groove is formed at the joint of the old concrete 5 and the new concrete 6, is positioned above the trapezoidal groove (namely the tail end of the new and old concrete pouring seam) and is used for placing a water stopping strip 4, so that the problem that underground water is blocked in place due to poor control or extreme underground environment caused by construction quality is avoided, and a waterproof saturated defense line of the new and old concrete joint is constructed; and the side surface of the old concrete 5 connected with the new concrete 6 is coated with a concrete joint self-waterproof layer 2, so that a main waterproof defense line of the new and old concrete joint is constructed.
As shown in fig. 2, the base waterproof layer 1 includes an upper concrete cushion layer 11, a waterproof roll 12, a base water stop 13 and a lower concrete cushion layer 14; the lower concrete cushion layer 14, the waterproof coiled material 12 and the base water stop belt 13 are sequentially laid from bottom to top, and the base water stop belt 13 is positioned below the new concrete 6 at the wedge-shaped gap; the concrete cushion layer is 200mm thick in total, wherein the lower concrete cushion layer 14 is 150mm thick and is poured before the waterproof roll material 12 is paved, the upper concrete cushion layer 11 is 50mm thick and is fine stone concrete, the fine stone concrete is positioned around the waterproof roll material 12 and the base water stop belt 13, and the fine stone concrete is poured after the waterproof roll material 12 is paved and is used as a protective layer of the roll material.
The waterproof roll material 12 is a thermoplastic polyolefin waterproof roll material or a macromolecule self-adhesive film waterproof roll material, two adjacent waterproof roll materials 12 are overlapped by an upper layer and a lower layer in a staggered joint mode, the overlapping joint needs to be fully adhered, and the overlapping joint width is 100 mm.
The base water stop 13 is a back-attached rubber water stop. And a fixing measure is taken when the back-pasted rubber water stop is laid, so that the back-pasted rubber water stop is prevented from displacing when concrete is poured.
The concrete joint self-waterproof layer 2 adopts cement-based capillary crystalline waterproof coating or cement paste which has the same mixing ratio with new concrete and is doped with 10% of U-shaped expanding agent, and the thickness of the coating is controlled to be 0.5-1.5 mm. The interface agent improves the pouring and connecting quality of new and old concrete, avoids the joint cracking phenomenon in the curing and operating processes, and enhances the mechanical property and the impermeability of the joint.
The middle waterproof layer 3 comprises high-performance self-compacting concrete 31 and a middle-buried water stop 32 pre-buried in the high-performance self-compacting concrete 31; the high-performance self-compacting concrete 31 may be blended with, for example, 0.7% of a cement-based permeable crystalline type waterproof material in order to improve the impermeability, in addition to the micro-expansive properties. After the embedded water stop 32 is fixed in the trapezoid groove, high-performance self-compacting concrete 31 is poured.
The buried water stop 32 is a steel-edged rubber water stop. Before the self-compacting concrete 31 and the new concrete 6 are poured, the end of the buried water stop 32 is wrapped with a water-swelling putty block with the thickness of 10mm, and the putty block exceeds the end part of the steel-edge water stop by 5 mm. The buried water stop 32 is lapped by rivets, the lapping length is not less than 100mm, and butyl rubber putty with the thickness of 1.5mm is clamped between two lapped steel plates.
The cross section of the water-swelling water stop strip 4 is 20 mm-30 mm, the water-swelling water stop strip is stuck in a groove which is cut in advance, and half volume of the water-swelling water stop strip is reserved and poured in new concrete 6.
A construction method of a high-performance connecting structure at a joint part of new and old concrete is characterized by comprising the following steps:
the method comprises the following steps: and (3) crushing and dismantling old concrete 5: statically crushing an original structure section, chiseling a trapezoidal groove in the middle of an old concrete 5 structure, chiseling a wedge-shaped notch at the bottom (namely the water facing side) of the old concrete 5 structure, and reserving a water stopping groove at the interface of new concrete 6 and the old concrete 5;
step two: constructing a substrate waterproof layer 1: constructing an upper concrete cushion layer 11, a lower concrete cushion layer 11, a paving waterproof coiled material 12 and a base water stop belt 13 in the wedge-shaped gap; the newly laid waterproof roll material 12 needs to be lapped on the original waterproof roll material, and the joint bonding of the roll material is well carried out;
step three: construction of a middle waterproof layer 3: pouring high-performance self-compacting concrete 31 in the trapezoid groove, and installing a buried water stop 32 in the high-performance self-compacting concrete; the end of the buried water stop 32 is wrapped with a water swelling putty block with the thickness of 10mm, and the putty block exceeds the end part of the steel edge water stop by 5 mm. The buried water stop 32 is overlapped by rivets, the overlapping length is not less than 100mm, and butyl rubber putty with the thickness of 1.5mm is clamped between two overlapped steel plates.
Step four: constructing a concrete joint self-waterproof layer 2 on the side surface where the old concrete 5 is connected with the new concrete 6; the construction of the self-waterproof layer 2 of the concrete joint comprises the following steps:
cleaning a matrix: carrying out sand blasting or high-pressure water gun roughening treatment on the section of the old concrete 5 so as to enhance the roughness of a concrete connection interface;
secondly, matrix water saturation treatment: spraying the section of the old concrete 5 for 24 hours by using a spraying device to ensure that the surface of the old concrete 5 is in a water-saturated state, and then naturally airing the surface;
thirdly, processing an interfacial agent: before the new concrete 6 is poured, a cement-based permeable crystalline waterproof coating or a cement paste which has the same mixing ratio as the new concrete 6 and is doped with 10 percent of U-shaped expanding agent is coated on a connecting interface, and the thickness of the coating is controlled to be 0.5 mm-1.5 mm.
Step five: and (3) constructing a water-swelling water stop strip 4: the water stop strip 4 is bonded at the water stop groove reserved in the water stop strip 4; the cross section of the water stop strip 4 is 20mm x 30mm, and the distance from the water stop strip to the back surface of the concrete is 10-15 cm.
Step six: and pouring new concrete 6 to complete the sealing of the four anti-seepage water-stop lines.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
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| CN202120633280.5U CN214883899U (en) | 2021-03-29 | 2021-03-29 | A high-performance connection structure for new and old concrete joints |
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| CN202120633280.5U CN214883899U (en) | 2021-03-29 | 2021-03-29 | A high-performance connection structure for new and old concrete joints |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112982497A (en) * | 2021-03-29 | 2021-06-18 | 中铁十二局集团有限公司 | High-performance connecting structure for joint parts of new concrete and old concrete and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112982497A (en) * | 2021-03-29 | 2021-06-18 | 中铁十二局集团有限公司 | High-performance connecting structure for joint parts of new concrete and old concrete and construction method |
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