阅读说明：本技术 沉井w形开挖下沉施工方法 (The W-shaped excavation sinking construction method of open caisson ) 是由 张永涛 陈培帅 贺祖浩 李德杰 孔茜 邱敏 罗会武 石章入 饶为胜 姚翔川 黄威 于 2019-08-08 设计创作，主要内容包括：本发明公开了一种沉井W形开挖下沉施工方法,施工步骤包括：S1,在待施工区域上方设置沉井；S2,通过计算将沉井的多个隔舱划分为：开挖区域、预留区域和辅助区域；S3,首先从开挖区域取土使沉井整体下沉,在沉井整体下沉的同时,从预留区域和辅助区域取土,保证开挖区域土体和其它两区域土体之间一定高度差；S4,当沉井下沉至设计接高位置处时,在沉井的顶部接高；接高后通过计算调整各区域的隔舱数量；S5,重复S3～S4直至沉井下沉至设计标高位置处；其中,S3中若从开挖区域取土后,沉井不下沉,开挖辅助区域直至沉井整体下沉。本发明具有施工简单、安全性高的特点,可广泛应用于桥梁中大型沉井下沉施工技术领域。(The invention discloses a kind of W-shaped excavation sinking construction methods of open caisson, and construction procedure includes: S1, and open caisson is arranged in overlying regions to be onstructed；S2 is divided multiple compartments of open caisson by calculating are as follows: excavation area domain, reserved area and auxiliary area；S3 takes soil to make open caisson integral sinking from excavation region first, while open caisson integral sinking, takes soil from reserved area and auxiliary area, and it is poor to guarantee to excavate certain altitude between the region soil body and other two regions soil body；S4 connects height when well sinking to design connects at high position at the top of open caisson；Pass through the compartment quantity for calculating and adjusting each region after connecing height；S5 repeats S3~S4 until at well sinking to designed elevation position；Wherein, if open caisson does not sink after taking soil from excavation region in S3, auxiliary area is excavated until open caisson integral sinking.The present invention has the characteristics that construction is simple, highly-safe, can be widely applied to the medium-and-large-sized caisson sinking construction technical field of bridge.)

1. a kind of W-shaped excavation sinking construction method of open caisson, which is characterized in that construction procedure includes:

Macro porous open caisson is arranged in overlying regions to be onstructed in S1；

Multiple compartments of open caisson are divided into three regions by calculating: excavating region, reserved area and auxiliary area by S2；In advance Stay region to be formed by being located at multiple compartments in the middle part of open caisson and multiple compartments at the both ends positioned at four sides of open caisson, auxiliary area by Remaining multiple compartment compositions positioned at four sides of open caisson, it is multiple by the residue in addition to reserved area, auxiliary area to excavate region Compartment composition；

S3 is excavated from the lower section for excavating the corresponding multiple compartments in region soil is taken to make open caisson integral sinking first, open caisson integrally under While heavy, the lower section of lower section and the corresponding multiple compartments of auxiliary area from the corresponding multiple compartments of reserved area, which is excavated, to be taken Soil, and make reserved area, the soil body surface below auxiliary area be consistently higher than excavate the lower section in region soil body bottom surface it is centainly high Degree；

S4 connects height when well sinking to design connects at high position at the top of open caisson；Pass through calculating adjustment excavation area after connecing height Domain, reserved area and auxiliary area corresponding compartment quantity；

S5 repeats S3~S4 until at well sinking to designed elevation position；

Wherein, it in S3, is excavated below the corresponding multiple compartments in excavation region after taking soil, if open caisson integral sinking cannot be made When, the soil layer below the corresponding multiple compartments of auxiliary area is excavated until open caisson integral sinking.

2. the W-shaped excavation sinking construction method of open caisson as described in claim 1, which is characterized in that calculating in S2 and S4 with It is theoretical foundation that ultimate bearing capacity of foundation soil, open caisson, which connect Gao Chongliang and open caisson and formation-engaging surfaces product, and is calculated using subsidence factor Area, the area of reserved area and the area of auxiliary area for excavating region is calculated in formula, with determining excavation region, in advance Stay region and the corresponding compartment quantity of auxiliary area.

3. the W-shaped excavation sinking construction method of open caisson as described in claim 1, which is characterized in that from excavation region pair in S3 Excavated below multiple compartments for answering after taking soil, if open caisson integral sinking cannot be made, excavate auxiliary area it is corresponding it is multiple every Before soil layer below cabin, the soil layer below the partition wall for being located at and excavating region is excavated, becomes partition wall by full blade foot holding state Half blade foot holding state, and then make open caisson integral sinking.

4. the W-shaped excavation sinking construction method of open caisson as described in claim 1, which is characterized in that excavating region and auxiliary region Excavate below domain when taking soil, need to ensure: excavate between region and reserved area, between auxiliary area and reserved area, excavation area Soil layer below the division wall of domain and auxiliary area does not excavate.

5. the W-shaped excavation sinking construction method of open caisson as described in claim 1, which is characterized in that from excavation region pair in S3 It is excavated below the multiple compartments answered after taking soil, if open caisson integral sinking cannot be made, and it is corresponding multiple excavating auxiliary area When cannot still make open caisson integral sinking after the soil layer below compartment, reserved area is gradually reduced on the basis of structural strength meets Corresponding compartment quantity, until open caisson integral sinking, and the compartment quantity of reserved area is reduced in pairs, and each pair of compartment is with heavy Well center point symmetry.

6. the W-shaped excavation sinking construction method of open caisson as described in claim 1, which is characterized in that from excavation region, reserved area When with taking soil in auxiliary area, a pair of of compartment in the same area is at least while excavated, and a pair of of compartment is with the central point of open caisson Symmetrically.

7. the W-shaped excavation sinking construction method of open caisson as described in claim 1, which is characterized in that in S3 guarantee reserved area, Soil body surface below auxiliary area is consistently higher than the soil body bottom surface 0.8m~1.5m excavated below region.

Technical field

The present invention relates to the medium-and-large-sized caisson sinking construction technical fields of bridge.It is more particularly related to a kind of heavy The W-shaped excavation sinking construction method of well.

Background technique

Well foundation buried depth is big, globality is strong, stability is good, obtains in Longspan Bridge anchorage in recent years extensively Using.Although the sinking construction method of open caisson, by years development and improvement, still there is also stagnate, dash forward in the construction process In the case that the problems such as heavy, structure is destroyed, especially geology and hydrologic condition are complicated, there is bigger risk in sinking construction.Cause This needs to design a kind of safe and efficient open caisson excavation construction method, steadily sinks under conditions of so that open caisson is met structure safety.

Summary of the invention

It is an object of the invention to solve at least the above problems, and provide the advantages of at least will be described later.

It is a still further object of the present invention to provide a kind of construction is simples, the W-shaped excavation sinking construction side of highly-safe open caisson Method.

In order to realize these purposes and other advantages according to the present invention, a kind of W-shaped excavation sinking construction of open caisson is provided Method, construction procedure include:

Macro porous open caisson is arranged in overlying regions to be onstructed in S1；

Multiple compartments of open caisson are divided into three regions by calculating: excavating region, reserved area and auxiliary region by S2 Domain；Reserved area is made of the multiple compartments for being located at multiple compartments in the middle part of open caisson and the both ends positioned at four sides of open caisson, is assisted Region is made of the remaining multiple compartments for being located at four sides of open caisson, excavates region by surplus in addition to reserved area, auxiliary area Remaining multiple compartment compositions；

S3 is excavated from the lower section for excavating the corresponding multiple compartments in region soil is taken to make open caisson integral sinking first, whole in open caisson While body sinks, the lower section of lower section and the corresponding multiple compartments of auxiliary area from the corresponding multiple compartments of reserved area is excavated Take soil, and make reserved area, the soil body surface below auxiliary area be consistently higher than excavate the lower section in region soil body bottom surface it is certain Highly；

S4 connects height when well sinking to design connects at high position at the top of open caisson；It is opened after connecing height by calculating adjustment Dig corresponding compartment quantity in region, reserved area and auxiliary area；

S5 repeats S3~S4 until at well sinking to designed elevation position；

Wherein, in S3, after excavating and being excavated below the corresponding multiple compartments in region and take soil, if cannot make open caisson integrally under When heavy, the soil layer below the corresponding multiple compartments of auxiliary area is excavated until open caisson integral sinking.

Preferably, the calculating in S2 and S4 meets Gao Chongliang with ultimate bearing capacity of foundation soil, open caisson and open caisson is contacted with stratum Area is theoretical foundation, and uses subsidence factor calculation formula, be calculated excavate the area in region, reserved area area and The area of auxiliary area excavates region, reserved area and the corresponding compartment quantity of auxiliary area to determine.

Preferably, it is excavated below the corresponding multiple compartments in excavation region in S3 after taking soil, if open caisson cannot be made whole When sinking, before excavating the soil layer below the corresponding multiple compartments of auxiliary area, excavate below the partition wall for being located at and excavating region Soil layer, so that partition wall is become half blade foot holding state by full blade foot holding state, and then make open caisson integral sinking.

Preferably, excavate excavated below region and auxiliary area take soil when, need to ensure: excavate region and reserved area it Between, between auxiliary area and reserved area, the soil layer that excavates below the division wall of region and auxiliary area do not excavate.

Preferably, it is excavated below the corresponding multiple compartments in excavation region in S3 after taking soil, if open caisson cannot be made whole When sinking, and when open caisson integral sinking still cannot be made after excavating the soil layer below the corresponding multiple compartments of auxiliary area, tying Structure intensity is gradually reduced compartment quantity corresponding to reserved area on the basis of meeting, until open caisson integral sinking, and trough The compartment quantity in domain is reduced in pairs, and each pair of compartment is with open caisson center point symmetry.

Preferably, it when taking soil from excavation region, reserved area and auxiliary area, at least while excavates in the same area A pair of of compartment, and a pair of of compartment is with the center point symmetry of open caisson.

Preferably, guarantee that reserved area, the soil body surface below auxiliary area are consistently higher than in S3 to excavate below region Soil body bottom surface 0.8m~1.5m.

The present invention is include at least the following beneficial effects:

1, open caisson is divided into 3 kinds of regions by construction method of the invention, takes soil operation letter in each region open caisson compartment excavation It is single, convenient for efficient construction；

2, in construction method of the invention be provided with auxiliary area, can take into account consider large-scale well-sinking excavation cannot sink, under It is heavy to measure the FAQs such as excessive；

3, subregion construction sinking, pairs of compartment digging mode, pairs of trough reduce mode in construction method of the invention The stress that structure during well sinking can be optimized avoids traditional digging mode and gradually excavates around from center and causes The case where drawing crack of open caisson.

Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this The research and practice of invention and be understood by the person skilled in the art.

Detailed description of the invention

Fig. 1 is that construction area of the invention divides schematic diagram；

Fig. 2 is that schematic diagram is excavated in sinking for the first time of the invention；

Fig. 3 is that open caisson of the invention connects high schematic diagram；

Fig. 4 is that half blade foot of the invention supports digging mode schematic diagram；

Fig. 5 is that reserved area of the invention excavates schematic diagram；

Appended drawing reference: 1, region is excavated；2, reserved area；3, auxiliary area；4, compartment；5, partition wall.

Specific embodiment

Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to specification text Word can be implemented accordingly.

It should be noted that experimental method described in following embodiments is unless otherwise specified conventional method, institute Reagent and material are stated, unless otherwise specified, is commercially obtained；In the description of the present invention, term " transverse direction ", " vertical To ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", the instructions such as "outside" side Position or positional relationship are to be based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description of the present invention and simplification of the description, It is not that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, because This is not considered as limiting the invention.

As shown in Figs. 1-5, the present invention provides a kind of W-shaped excavation sinking construction method of open caisson, and construction procedure includes:

Macro porous open caisson is arranged in overlying regions to be onstructed in S1, internal transverse and longitudinal be equipped with orthogonal multi-panel every Wall 5, so that open caisson is divided into multiple compartments 4；

Multiple compartments 4 of open caisson are divided into three regions by calculating by S2: excavating region 1, reserved area 2 and auxiliary Region 3；Reserved area 2 is by being located at multiple compartments 4 in the middle part of open caisson and 4 groups of multiple compartments of the both ends positioned at four sides of open caisson At auxiliary area 3 is made of the remaining multiple compartments 4 for being located at four sides of open caisson, excavates region 1 by except reserved area 2, auxiliary The multiple compartments 4 of residue outside region 3 form；

S3 is excavated from the lower section for excavating the corresponding multiple compartments 4 in region 1 soil is taken to make open caisson integral sinking first, in open caisson While integral sinking, under the lower section and the corresponding multiple compartments 4 of auxiliary area 3 of the corresponding multiple compartments 4 of reserved area 2 Side excavates and takes soil, and reserved area 2, the soil body surface of 3 lower section of auxiliary area is made to be consistently higher than the soil body for excavating the lower section in region 1 Bottom surface certain altitude；

S4 connects height when well sinking to design connects at high position at the top of open caisson；It is opened after connecing height by calculating adjustment Dig 4 quantity of corresponding compartment in region 1, reserved area 2 and auxiliary area 3；

S5 repeats S3~S4 until at well sinking to designed elevation position；

Wherein, it in S3, is excavated below the corresponding multiple compartments 4 in excavation region 1 after taking soil, if open caisson cannot be made whole When sinking, the soil layer of corresponding multiple 4 lower sections of compartment of auxiliary area 3 is excavated until open caisson integral sinking.

In this kind of technical solution, as shown in Fig. 1, macro porous open caisson is divided into three big subregions；As attached drawing 2,3, 4, shown in 5, the soil body below open caisson construction process middle section, by the left and right directions of paper plane successively present it is high and low, high and low, High posture is then the W-shaped excavation sinking construction method of open caisson.

In another technical solution, the calculating in S2 and S4 meets Gao Chongliang with ultimate bearing capacity of foundation soil, open caisson and sinks Well and formation-engaging surfaces product are theoretical foundation, and use subsidence factor calculation formula, and the area, pre- for excavating region 1 is calculated The area in region 2 and the area of auxiliary area 3 are stayed, to determine that excavation region 1, reserved area 2 and auxiliary area 3 are corresponding 4 quantity of compartment.

In this kind of technical solution, to guarantee that soil layer is under open caisson with W-shaped excavation, then 4 quantity of compartment for excavating region 1 At least 2,4 quantity of compartment of reserved area 2 being located in the middle part of open caisson is at least 1, and reserved area 2 is located at the every of open caisson 4 quantity of compartment at the both ends on a side is at least 2, and 4 quantity of compartment of auxiliary area 3 is at least 2.

In another technical solution, excavated below the corresponding multiple compartments 4 in excavation region 1 in S3 after taking soil, if When cannot make open caisson integral sinking, before excavating the soil layer below the corresponding multiple compartments 4 of auxiliary area 3, excavates to be located at and open The soil layer for digging 5 lower section of partition wall in region 1, makes partition wall 5 become half blade foot holding state by full blade foot holding state, and then make open caisson Integral sinking.

In this kind of technical solution, full blade foot support and the support of half blade foot are divided into below partition wall 5, the full blade foot support is The soil layer for being located at the 4 lower section middle part of compartment for excavating region 1 is excavated, and the 5 lower section soil layer of partition wall of 4 surrounding of compartment does not excavate；If complete Blade foot support cannot make open caisson integral sinking, be supported using half blade foot, to excavate in 4 lower section of compartment for being located at and excavating region 1 The 5 lower section soil layer of soil layer and surrounding partition wall in portion, and then make open caisson integral sinking.

In another technical solution, when excavation takes soil below excavation region 1 and auxiliary area 3, it need to ensure: excavation area Between domain 1 and reserved area 2, between auxiliary area 3 and reserved area 2, excavate 5 lower section of division wall of region 1 and auxiliary area 3 Soil layer do not excavate.

In another technical solution, excavated below the corresponding multiple compartments 4 in excavation region 1 in S3 after taking soil, if When cannot make open caisson integral sinking, and it cannot still make open caisson after excavating the soil layer below the corresponding multiple compartments 4 of auxiliary area 3 When integral sinking, 4 quantity of compartment corresponding to reserved area 2 is gradually decreased on the basis of structural strength meets, until open caisson Integral sinking, and 4 quantity of compartment of reserved area 2 is reduced in pairs, and each pair of compartment 4 is with open caisson center point symmetry.

In this kind of technical solution, in order to guarantee stabilization when well sinking, need to guarantee multiple compartments of reserved area 2 4 with open caisson center point symmetry, so when needing to reduce 4 quantity of compartment corresponding to reserved area 2, should be pairs of in open caisson The heart is symmetrically reduced.

In another technical solution, when taking soil from excavation region 1, reserved area 2 and auxiliary area 3, at least while A pair of of compartment 4 in the same area is excavated, and a pair of of compartment 4 is with the center point symmetry of open caisson.

In this kind of technical solution, in order to guarantee stabilization when well sinking, need to guarantee excavate each region in every With open caisson center point symmetry excavation when cabin 4.

In another technical solution, guarantee that reserved area 2, the soil body surface below auxiliary area 3 are high always in S3 In the soil body bottom surface 0.8m~1.5m for excavating 1 lower section of region.

In this kind of technical solution, being maintained at certain altitude difference is while the difference in height in order to enable open caisson continuously to sink It is also ensured that the soil body of open caisson lower stable supports.

Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited In specific details and legend shown and described herein.