Method for preventing surface cracks of large volume concrete

Abstract

The application discloses a large-volume concrete surface layer anti-cracking method, which comprises the following steps: step 1, layering the anchor block, and starting construction from the lowermost layer; step 2, setting a rigid framework at the position of the surface of the anchor block body of the layer, installing a supporting steel mesh on the rigid framework, then fixing a dense mesh on the supporting steel mesh, and installing an anti-cracking steel mesh on the rigid framework; step 3, synchronously pouring the anchor block body and the anti-cracking concrete layer of the layer; and step 4, repeating steps 2 and 3 on the completed anchor block to perform construction of the anchor block of the next layer until the anchor block construction is completed. The application sets an anti-cracking concrete layer on the surface of the anchor block, and connects the rigid framework, the supporting steel mesh, the anti-cracking steel mesh and the dense mesh to improve the overall strength of the anchor block, the overall stress, and the stress performance of the anchor block, and reduce the cracking of the anchor block.

Description

TECHNICAL FIELD

[0001] The present application relates to underground or underwater structures, in particular to a mass concrete surface anti-cracking method. BACKGROUND

[0002] Mass concrete refers to concrete with a large volume poured on site. During the construction of mass concrete, the hydration heat of cement causes the internal temperature of the concrete to rise sharply, while the surface temperature is relatively low due to heat dissipation to the air, forming an internal and external temperature difference. Due to the existence of external constraints, tensile stress is generated in the internal concrete, resulting in temperature cracks.

[0003] Therefore, there is a need for a mass concrete surface anti-cracking method that can effectively reduce the generation of cracks in mass concrete. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes an anti-cracking structure that can effectively solve the surface cracking of mass concrete and ensure the quality of the entity. The technical solution adopted includes:

[0005] A mass concrete surface anti-cracking method includes:

[0006] Step 1: Layering the anchor block, starting from the bottom layer to construct the anchor block;

[0007] Step 2: Setting the rigid skeleton on the surface of the anchor block body, installing the support steel mesh on the rigid skeleton, and then fixing the dense mesh on the support steel mesh, so that the dense mesh is distributed at the junction of the anchor block body and the anti-cracking concrete layer, and the anti-cracking steel mesh is installed on the rigid skeleton and distributed inside the protective layer of the anti-cracking concrete layer;

[0008] Step 3: Synchronously pouring the anchor block body and the anti-cracking concrete layer of the layer, using ordinary concrete to pour the anchor block body, and using anti-cracking concrete to pour the anti-cracking concrete layer, completing the construction of the anchor block of the layer;

[0009] Step 4: Repeating steps 2 and 3 on the poured anchor block to construct the next layer of anchor block until the anchor block construction is completed.

[0010] An embodiment of the present application solves the technical problem by adopting the technical solution: the rigid skeleton is arranged at the top surface or bottom surface of the anchor block body.

[0011] An embodiment of the present application adopts the technical scheme that the technical problem is solved: the upper surface or the lower surface of the anchor block body is respectively provided with a plurality of layers of rigid framework groups, the plurality of layers of rigid framework groups are sequentially arranged along the inclined surface direction of the upper surface or the lower surface of the anchor block body, each layer of the rigid framework group comprises a plurality of rigid frameworks, and the plurality of rigid frameworks are arranged in the width direction of the upper surface or the lower surface and are connected to each other.

[0012] An embodiment of the present application adopts the technical scheme that the technical problem is solved: the thickness of the anti-cracking concrete layer is 50-100 cm.

[0013] An embodiment of the present application adopts the technical scheme that the technical problem is solved: the anti-cracking concrete is mixed by ordinary concrete and fiber anti-cracking composite material, and 1-2 kg of fiber anti-cracking composite material is doped per cubic meter of ordinary concrete.

[0014] An embodiment of the present application adopts the technical scheme that the technical problem is solved: the anchor block body has an upper surface and / or a lower surface, the rigid framework comprises an upper surface rigid framework and / or a lower surface rigid framework, and the upper surface rigid framework and the lower surface rigid framework are arranged on the upper surface and the lower surface of the anchor block body respectively.

[0015] An embodiment of the present application adopts the technical scheme that the technical problem is solved: the upper surface rigid framework comprises two pairs of fixed frames, two pairs of beam groups and two inclined column groups, the two fixed frames are horizontally and spaced apart, the two pairs of beam groups are arranged on the two sides of the fixed frame respectively, each pair of beam group comprises a first beam and a second beam, the middle part of the first beam is connected to the middle part of one of the fixed frames, one end of the first beam is connected to the middle part of the other fixed frame, the middle part of the second beam is connected to the upper end of one of the fixed frames, one end of the second beam is connected to the upper end of the other fixed frame, one end of the two inclined columns is respectively connected to the lower end of the two sides of the fixed frame, the middle part of the two inclined columns is connected to the other end of the first beam, and the other end of the two inclined columns is respectively connected to the other end of the two second beams.

[0016] An embodiment of the present application adopts the technical scheme that the technical problem is solved: the two inclined columns are respectively welded to the support steel mesh.

[0017] An embodiment of the present application adopts the technical scheme that the technical problem is solved: each fixed frame comprises a vertically arranged rectangular frame and a support column mounted in the rectangular frame, and the support column is distributed along the diagonal line of the rectangular frame.

[0018] An embodiment of the present application adopts the technical scheme to solve its technical problem: the bottom surface stiff skeleton comprises a first rectangular frame, a second rectangular frame, a horizontal support rod, two longitudinal support rods, two vertical support rods and two inclined support rods, one end of the first rectangular frame and the second rectangular frame is connected, the first rectangular frame is horizontally distributed, the second rectangular frame is vertically distributed, the two inclined support rods are arranged on both sides between the first rectangular frame and the second rectangular frame, the two ends of each inclined support rod are connected with the ends of the first rectangular frame and the second rectangular frame away from each other, the two longitudinal support rods are horizontally arranged and connected with the middle parts of the two inclined support rods and the middle parts of the two sides of the second rectangular frame, and the two vertical support rods are vertically arranged and connected with the middle parts of the two inclined support rods and the middle parts of the two sides of the first rectangular frame.

[0019] The present application has the beneficial effects that:

[0020] The present application sets the anti-cracking concrete layer on the surface of the anchor block body, improves the anti-cracking performance of the anchor body surface, and improves the tensile, bending, impact strength, elongation and toughness of the concrete.

[0021] The stiff skeleton fixes the dense mesh, the dense mesh separates the ordinary concrete and the anti-cracking concrete, and avoids the quality problem caused by the mixing of the two kinds of concrete.

[0022] The steel mesh is installed on the stiff skeleton, the steel mesh, the stiff skeleton and the anchor block steel are connected into one body, the integrity of the anchor block structure is ensured, the overall strength is improved, the overall stress is improved, the stress performance of the anchor block is improved, and the cracking of the anchor block is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0024] Figure 1 The structure schematic view of the anchor block of the embodiment of the present application is shown in the figure;

[0025] Figure 2 The top view of the anchor block of the embodiment of the present application is shown in the figure;

[0026] Figure 3 The structure schematic view of the bottom surface stiff skeleton of the embodiment of the present application is shown in the figure;

[0027] Figure 4 The structure schematic view of the bottom surface stiff skeleton of the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application will be described in detail in this section, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part of the description, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0029] In the description of the present application, the meaning of multiple is more than two, greater than, less than, more than, etc. is not included in the number, above, below, within, etc. is included in the number. If the first, second is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0030] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the present application.

[0031] In the present application, unless otherwise explicitly limited, the words "set", "install", "connect" and the like should be broadly understood, for example, they can be directly connected, or indirectly connected through an intermediate medium; can be fixedly connected, or can be detachably connected, or can be integrally formed; can be mechanically connected; can be the internal communication or interaction relationship of two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0032] Referring to Figures 1-4 The construction method of the anchor block described in the present application is specifically as follows:

[0033] Step 1, stratifying the anchor block, starting from the bottom layer to construct the anchor block;

[0034] Step 2, setting the rigid framework 5 at the position of the surface of the anchor block body 1 of the layer, installing the supporting steel mesh 4 on the rigid framework 5, then fixing the dense mesh 3 on the supporting steel mesh 4, so that the dense mesh 3 is distributed at the junction of the anchor block body 1 and the anti-cracking concrete layer 2, and installing the anti-cracking steel mesh 7 on the rigid framework 5, so that the anti-cracking steel mesh 7 is distributed inside the protective layer of the anti-cracking concrete layer 2;

[0035] Step 3, synchronously pouring the anchor block body 1 and the anti-cracking concrete layer 2 of the layer, and pouring the anchor block body 1 with ordinary concrete, and pouring the anti-cracking concrete layer 2 with anti-cracking concrete, to complete the construction of the anchor block of the layer.

[0036] Step 4, repeating step 2 and step 3 on the completed anchor block to carry out the next layer of anchor block construction until the anchor block construction is completed.

[0037] The anchor block comprises an anchor block body 1, a crack-resistant concrete layer 2 covering the surface of the anchor block body 1, and a dense mesh 3 distributed between the anchor block body 1 and the crack-resistant concrete layer 2, the anchor block body 1 is poured with ordinary concrete, the crack-resistant concrete layer 2 is poured with crack-resistant concrete, the crack-resistant concrete layer 2 is provided with a crack-resistant steel mesh 7 at the surface layer, the surface of the anchor block body 1 is provided with a rigid skeleton 5 near the crack-resistant concrete layer 2, the rigid skeleton 5 is provided with a support steel mesh 4 on one side near the crack-resistant concrete layer 2, the dense mesh 3 is installed on the support steel mesh 4, and the rigid skeleton 5 is provided with a pick-up wire 6, and the pick-up wire 6 is connected with the crack-resistant steel mesh 7.

[0038] Because the anchor block body 1 has an upper surface and a lower surface, in order to facilitate the installation of the support steel mesh 4 for installing the dense mesh 3, the support steel mesh is installed by setting the rigid skeleton 5 on the surface of the anchor block body 1.

[0039] The crack-resistant concrete layer 2 is arranged within a range of 50 cm of the anchor block body 1, the anchor block body 1 is poured with ordinary concrete, and the ordinary concrete can be C30 or C35, the crack-resistant concrete layer 2 is poured with crack-resistant concrete, the crack-resistant concrete is mixed with ordinary concrete and fiber crack-resistant composite material, and 1-2 kg of fiber crack-resistant composite material is doped per cubic meter of ordinary concrete to form crack-resistant concrete, and in the embodiment, the crack-resistant fiber is SY-COM high-performance fiber crack-resistant composite material.

[0040] The application improves the crack resistance of the anchor body surface by setting the crack-resistant concrete layer 2 on the surface of the anchor block body 1, so that the tensile, bending, impact strength, elongation and toughness of the concrete are improved; the dense mesh 3 is fixed by installing the support steel mesh 4 on the rigid skeleton 5, and the dense mesh 3 separates the ordinary concrete and the crack-resistant concrete to avoid quality problems caused by mixing the two kinds of concrete;

[0041] The application sets the crack-resistant concrete layer 2 on the surface of the anchor block body 1, and sets the dense mesh 3 in the crack-resistant concrete layer 2, which realizes the crack resistance of the anchor body surface by combining the two methods, guarantees the integrity of the anchor block structure, improves the overall strength, and improves the stress performance of the anchor block.

[0042] Specifically, the pick-up wire 6 is provided with a steel positioning hoop at the end, and the crack-resistant steel mesh 7 is fixed on the steel positioning hoop.

[0043] The anchor block body 1 has an upward and / or downward surface, and the stiffening frame 5 includes an upward stiffening frame 51 and / or a downward stiffening frame 52. The upward stiffening frame 51 and the downward stiffening frame 52 are respectively used to be installed on the upward and downward surfaces of the anchor block body 1.

[0044] In this embodiment, the anchor block body 1 has an upward surface and a downward surface. The upward stiffening frame 51 is composed of two pairs of fixed frames 511, two pairs of crossbeam groups 512, and two inclined columns 513. The two fixed frames 511 are horizontally spaced apart. The two pairs of crossbeam groups 512 are respectively arranged on both sides of the fixed frames 511. Each pair of crossbeam groups 512 includes a first crossbeam 5121 and a second crossbeam 5122. The middle part of the first crossbeam 5121 is connected to the middle part of one of the fixed frames 511, and one end of the first crossbeam 5121 is connected to the middle part of the other fixed frame 511. The middle part of the second crossbeam 5122 is connected to the upper end of one of the fixed frames 511, and one end of the second crossbeam 5122 is connected to the upper end of the other fixed frame 511. One end of each of the two inclined columns 513 is connected to the lower ends of both sides of the fixed frames 511. The other end of the first crossbeam 5121 is connected in the middle of the two columns. The other end of each of the two inclined columns 513 is connected to the other end of the two second crossbeams 5122.

[0045] The two inclined columns 513 are respectively welded to the steel bars inside the anchor block body 1. The stiffening frame 5 is welded to the steel bars of the anchor block. The crack-resistant steel mesh 7 is installed on the stiffening frame 5. The crack-resistant steel mesh 7, the stiffening frame 5 and the anchor block steel bars are connected as one, which further improves the overall strength and overall stress, improves the stress performance of the anchor block and reduces the cracking of the anchor block.

[0046] In this embodiment, the stiffening frame 5 is disposed on the overhead or downward surface of the anchor block body 1. The overhead or downward surface of the anchor block body 1 is provided with multiple stiffening frame groups. The multiple stiffening frame groups are arranged sequentially along the inclined direction of the overhead or downward surface of the anchor block body 1. Each layer of the stiffening frame group includes multiple stiffening frames 5, and the multiple stiffening frames 5 are spaced apart and connected to each other along the width direction of the overhead or downward surface.

[0047] After the anchor blocks are constructed in layers, and a stiffening frame 5 is set on the surface of each anchor block body 1, a supporting steel mesh 4 is installed on each layer of stiffening frame 5. Then, a dense mesh 3 is installed on the supporting steel mesh 4. The supporting steel mesh 4 can be fixedly installed on the stiffening frame 5 by welding, and the dense mesh 3 can be installed on the steel mesh by binding. Then, a cantilever bar 6 is installed on the stiffening frame 5, and a crack-resistant steel mesh 7 is installed on the cantilever bar 6. Then, the anchor block body 1 and the crack-resistant concrete layer of that layer are poured simultaneously.

[0048] By dividing the large concrete body into blocks for pouring, the peak of concrete water thermalization is reduced, the highest temperature in the concrete is lowered, the temperature difference between the inside and outside of the concrete is reduced, and the cracking of the concrete due to temperature stress is reduced.

[0049] Each of the fixed frames 511 comprises a vertically arranged rectangular frame 5111 and a support column 5112 mounted in the rectangular frame 5111, and the support column 5112 is distributed along the diagonal of the rectangular frame.

[0050] Two of the fixed frames 511 are also connected by diagonal web members, which improve the stability of the structure of the upward stiff skeleton 51.

[0051] The downward stiff skeleton 52 comprises a first rectangular frame 521, a second rectangular frame 522, a horizontal support column 523, two vertical support columns 524, two vertical support columns 525 and two diagonal support columns 526, one end of the first rectangular frame 521 and the second rectangular frame 522 is connected, the first rectangular frame 521 is horizontally distributed, the second rectangular frame 522 is vertically distributed, two diagonal support columns 526 are arranged on both sides between the first rectangular frame 521 and the second rectangular frame 522, both ends of each diagonal support column 526 are connected to the ends of the first rectangular frame 521 and the second rectangular frame 522 away from each other, two vertical support columns 524 are horizontally arranged and connected to the middle of the two diagonal support columns 526 and the middle of the two sides of the second rectangular frame 522, and two vertical support columns 525 are vertically arranged and connected to the middle of the two diagonal support columns 526 and the middle of the two sides of the first rectangular frame 521.

[0052] The first rectangular frame 521 is composed of a frame body and a diagonal web member mounted on one diagonal line of the frame body; and the second rectangular frame is composed of a frame body and diagonal web members mounted on two diagonal lines of the frame body.

[0053] The upward stiff skeleton 51 and the downward stiff skeleton 52 are both composed of angle steels.

[0054] Of course, the present application is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications and replacements are all included in the scope defined by the claims of the present application.

Claims

1. A method of preventing surface cracking in a mass concrete structure, characterized by, The application relates to an anchor block construction method. Step 1: layering the anchor block, starting from the bottom layer; Step 2: arranging a rigid framework (5) on the surface of the anchor block body (1) of the layer, installing a supporting steel mesh (4) on the rigid framework (5), fixing a dense mesh (3) on the supporting steel mesh (4), distributing the dense mesh (3) at the joint of the anchor block body (1) and the anti-cracking concrete layer (2), installing an anti-cracking steel mesh (7) on the rigid framework (5) and distributing the anti-cracking steel mesh (7) inside the protective layer of the anti-cracking concrete layer (2); Step 3: synchronously pouring the anchor block body (1) and the anti-cracking concrete layer (2) of the layer, pouring the anchor block body (1) with ordinary concrete and pouring the anti-cracking concrete layer (2) with anti-cracking concrete, and completing the construction of the anchor block of the layer; Step 4: repeating steps 2 and 3 on the completed anchor block to construct the anchor block of the next layer until the construction of the anchor block is completed.

2. The method of claim 1, wherein the method further comprises: The rigid framework (5) is arranged on the top surface or the bottom surface of the anchor block body (1).

3. The method of claim 2, wherein the method further comprises: The top surface or the bottom surface of the anchor block body (1) is respectively provided with a plurality of rigid framework groups, the rigid framework groups are sequentially arranged along the inclined surface direction of the top surface or the bottom surface of the anchor block body (1), each rigid framework group comprises a plurality of rigid frameworks (5), and the rigid frameworks (5) are arranged in the width direction of the top surface or the bottom surface and are connected to each other.

4. The method of claim 1, wherein the method further comprises: The thickness of the anti-cracking concrete layer (2) is 50-100 cm.

5. The method of claim 1, wherein the method further comprises: The anti-cracking concrete is mixed by ordinary concrete and a fiber anti-cracking composite material, and 1-2 kg of the fiber anti-cracking composite material is doped in each cubic meter of the ordinary concrete.

6. The method of claim 1, wherein the method further comprises: The anchor block body (1) has a top surface and / or a bottom surface, the rigid framework (5) comprises a top surface rigid framework (51) and / or a bottom surface rigid framework (52), and the top surface rigid framework (51) and the bottom surface rigid framework (52) are arranged on the top surface and the bottom surface of the anchor block body (1) respectively.

7. The method of claim 6, wherein the method further comprises: The up face rigid skeleton (51) comprises two pairs of fixed frames (511), two pairs of beam groups (512) and two inclined columns (513), two fixed frames (511) are horizontally and spaced apart, two pairs of beam groups (512) are arranged on the two sides of the fixed frame (511), each pair of beam groups (512) comprises a first beam (5121) and a second beam (5122), the middle part of the first beam (5121) is connected with the middle part of one of the fixed frames (511), one end is connected with the middle part of the other fixed frame (511), the middle part of the second beam (5122) is connected with the upper end of one of the fixed frames (511), one end is connected with the upper end of the other fixed frame (511), one end of the two inclined columns (513) is connected with the lower end of the fixed frame (511) on the two sides respectively, the middle part of the first beam (5121) is connected with the other end of the two inclined columns (513), the other end of the two inclined columns (513) is connected with the other end of the two second beams (5122) respectively.

8. The method of claim 7, wherein the method further comprises: The two inclined columns are welded with the support steel mesh (4) respectively.

9. The method of claim 7, wherein the method further comprises: Each fixed frame (511) comprises a vertically arranged rectangular frame (5111) and a support column (5112) mounted in the rectangular frame (5111), and the support column (5112) is distributed along the diagonal of the rectangular frame.

10. The method of claim 6, wherein the method further comprises: The down face rigid skeleton (52) comprises a first rectangular frame (521), a second rectangular frame (522), a horizontal support rod (523), two longitudinal support rods (524), two vertical support rods (525) and two inclined support rods (526), one end of the first rectangular frame (521) and the second rectangular frame (522) is connected, the first rectangular frame (521) is horizontally distributed, the second rectangular frame (522) is vertically distributed, two inclined support rods (526) are arranged on the two sides between the first rectangular frame (521) and the second rectangular frame (522), two ends of each inclined support rod (526) are connected with the ends of the first rectangular frame (521) and the second rectangular frame (522) away from each other respectively, two longitudinal support rods (524) are horizontally arranged and connected with the middle part of the two inclined support rods (526) and the middle part of the two sides of the second rectangular frame (522) respectively, two vertical support rods (525) are vertically arranged and connected with the middle part of the two inclined support rods (526) and the middle part of the two sides of the first rectangular frame (521) respectively.

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